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  • 1.
    Abid, Muhammad Adil
    et al.
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT).
    Amouzad Mahdiraji, Saeid
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT).
    Lorig, Fabian
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT). Malmö universitet, Internet of Things and People (IOTAP).
    Holmgren, Johan
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT).
    Mihailescu, Radu-Casian
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT).
    Petersson, Jesper
    Department of Health Care Management, Region Skåne, 21428 Malmö, Sweden; Department of Neurology, Lund University, 22242 Malmö, Sweden.
    A Genetic Algorithm for Optimizing Mobile Stroke Unit Deployment2023Inngår i: Procedia Computer Science, ISSN 1877-0509, Vol. 225, s. 3536-3545Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A mobile stroke unit (MSU) is an advanced ambulance equipped with specialized technology and trained healthcare personnel to provide on-site diagnosis and treatment for stroke patients. Providing efficient access to healthcare (in a viable way) requires optimizing the placement of MSUs. In this study, we propose a time-efficient method based on a genetic algorithm (GA) to find the most suitable ambulance sites for the placement of MSUs (given the number of MSUs and a set of potential sites). We designed an efficient encoding scheme for the input data (the number of MSUs and potential sites) and developed custom selection, crossover, and mutation operators that are tailored according to the characteristics of the MSU allocation problem. We present a case study on the Southern Healthcare Region in Sweden to demonstrate the generality and robustness of our proposed GA method. Particularly, we demonstrate our method's flexibility and adaptability through a series of experiments across multiple settings. For the considered scenario, our proposed method outperforms the exhaustive search method by finding the best locations within 0.16, 1.44, and 10.09 minutes in the deployment of three MSUs, four MSUs, and five MSUs, resulting in 8.75x, 16.36x, and 24.77x faster performance, respectively. Furthermore, we validate the method's robustness by iterating GA multiple times and reporting its average fitness score (performance convergence). In addition, we show the effectiveness of our method by evaluating key hyperparameters, that is, population size, mutation rate, and the number of generations.

    Fulltekst (pdf)
    fulltext
  • 2.
    Adewole, Kayode Sakariyah
    et al.
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT). Department of Computer Science, University of Ilorin, Ilorin, Nigeria.
    Torra, Vicenç
    Department of Computing Science, Umeå University, Sweden.
    Energy disaggregation risk resilience through microaggregation and discrete Fourier transform2024Inngår i: Information Sciences, ISSN 0020-0255, E-ISSN 1872-6291, Vol. 662, artikkel-id 120211Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Progress in the field of Non-Intrusive Load Monitoring (NILM) has been attributed to the rise in the application of artificial intelligence. Nevertheless, the ability of energy disaggregation algorithms to disaggregate different appliance signatures from aggregated smart grid data poses some privacy issues. This paper introduces a new notion of disclosure risk termed energy disaggregation risk. The performance of Sequence-to-Sequence (Seq2Seq) NILM deep learning algorithm along with three activation extraction methods are studied using two publicly available datasets. To understand the extent of disclosure, we study three inference attacks on aggregated data. The results show that Variance Sensitive Thresholding (VST) event detection method outperformed the other two methods in revealing households' lifestyles based on the signature of the appliances. To reduce energy disaggregation risk, we investigate the performance of two privacy-preserving mechanisms based on microaggregation and Discrete Fourier Transform (DFT). Empirically, for the first scenario of inference attack on UK-DALE, VST produces disaggregation risks of 99%, 100%, 89% and 99% for fridge, dish washer, microwave, and kettle respectively. For washing machine, Activation Time Extraction (ATE) method produces a disaggregation risk of 87%. We obtain similar results for other inference attack scenarios and the risk reduces using the two privacy-protection mechanisms.

  • 3.
    Ahlqvist, Carl Oskar
    et al.
    Malmö universitet, Fakulteten för teknik och samhälle (TS).
    Ahlgren, Måns
    Malmö universitet, Fakulteten för teknik och samhälle (TS).
    Analog Computer Prototyping for the Future2022Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    This research paper focuses on analog computers and creating a modular low-cost analog computer system in a single board computer form factor. The single-board analog computer will have the capacity to solve second-order differential equations. The capabilities and possibilities of the single board Analog computer will be explored as well as analog computing in general. The paper follows design science research methodology (DSRM) with the goal of creating and evaluating a working artifact. The artifacts' functionality is evaluated based on a demonstration of its ability to solve Mathieu’s differential equation as well as simulate a spring-mass dampening system. This paper proves that it is possible to create a low-cost analog computer in a modern form factor. The artifact is also placed in a larger contextual setting based on the empirical material provided where its value of it in a digital society is presented. For the world to continue its progression in computational power, but still, limit the already high energy usage, a drastic change is needed. This paper suggests adapting to analog/hybrid technology. To further the progression of analog/hybrid technology it must be made accessible to a wider group of people compared to today. The artifact in this paper offers a solution to this. 

    Fulltekst (pdf)
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  • 4.
    Aladwan, Mohammad N.
    et al.
    Univ Santiago de Compostela, Ctr Singular Invest Tecnoloxias Intelixentes, Santiago De Compostela 15782, Spain..
    Awaysheh, Feras M.
    Univ Santiago de Compostela, Ctr Singular Invest Tecnoloxias Intelixentes, Santiago De Compostela 15782, Spain..
    Alawadi, Sadi
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT). Malmö universitet, Internet of Things and People (IOTAP).
    Alazab, Mamoun
    Charles Darwin Univ, Coll Engn IT & Environm, Casuarina, NT 0810, Australia..
    Pena, Tomas F.
    Univ Santiago de Compostela, Ctr Singular Invest Tecnoloxias Intelixentes, Santiago De Compostela 15782, Spain..
    Cabaleiro, Jose C.
    Univ Santiago de Compostela, Ctr Singular Invest Tecnoloxias Intelixentes, Santiago De Compostela 15782, Spain..
    TrustE-VC: Trustworthy Evaluation Framework for Industrial Connected Vehicles in the Cloud2020Inngår i: IEEE Transactions on Industrial Informatics, ISSN 1551-3203, E-ISSN 1941-0050, Vol. 16, nr 9, s. 6203-6213Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The integration between cloud computing and vehicular ad hoc networks, namely, vehicular clouds (VCs), has become a significant research area. This integration was proposed to accelerate the adoption of intelligent transportation systems. The trustworthiness in VCs is expected to carry more computing capabilities that manage large-scale collected data. This trend requires a security evaluation framework that ensures data privacy protection, integrity of information, and availability of resources. To the best of our knowledge, this is the first study that proposes a robust trustworthiness evaluation of vehicular cloud for security criteria evaluation and selection. This article proposes three-level security features in order to develop effectiveness and trustworthiness in VCs. To assess and evaluate these security features, our evaluation framework consists of three main interconnected components: 1) an aggregation of the security evaluation values of the security criteria for each level; 2) a fuzzy multicriteria decision-making algorithm; and 3) a simple additive weight associated with the importance-performance analysis and performance rate to visualize the framework findings. The evaluation results of the security criteria based on the average performance rate and global weight suggest that data residency, data privacy, and data ownership are the most pressing challenges in assessing data protection in a VC environment. Overall, this article paves the way for a secure VC using an evaluation of effective security features and underscores directions and challenges facing the VC community. This article sheds light on the importance of security by design, emphasizing multiple layers of security when implementing industrial VCs.

  • 5.
    Al-Dhaqm, Arafat
    et al.
    Faculty of Engineering, School of Computing, Computer Science Department, Universiti Teknologi Malaysia (UTM), Skudai 81310, Johor, Malaysia; Computer Science Department, Aden Community College, Aden 999101, Yemen.
    Razak, Shukor
    Faculty of Engineering, School of Computing, Computer Science Department, Universiti Teknologi Malaysia (UTM), Skudai 81310, Johor, Malaysia.
    Ikuesan, Richard
    Department of Cybersecurity and Networking, School of Information Technology, Community College Qatar, Doha 7344, Qatar.
    Kebande, Victor R.
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT). Malmö universitet, Internet of Things and People (IOTAP). Luleå University of Technology.
    Othman, Siti
    Faculty of Engineering, School of Computing, Computer Science Department, Universiti Teknologi Malaysia (UTM), Skudai 81310, Johor, Malaysia.
    Face Validation of Database Forensic Investigation Metamodel2021Inngår i: Infrastructues, ISSN 2412-3811, Vol. 6, nr 2, s. 1-20, artikkel-id 13Artikkel i tidsskrift (Annet vitenskapelig)
    Abstract [en]

    Using a face validity approach, this paper provides a validation of the Database Forensic Investigation Metamodel (DBFIM). The DBFIM was developed to solve interoperability, heterogeneity, complexity, and ambiguity in the database forensic investigation (DBFI) field, where severalmodels were identified, collected, and reviewed to develop DBFIM. However, the developedDBFIM lacked the face validity-based approach that could ensure DBFIM’s applicability in the DBFIfield. The completeness, usefulness, and logic of the developed DBFIM needed to be validated byexperts. Therefore, the objective of this paper is to perform the validation of the developed DBFIMusing the qualitative face validity approach. The face validity method is a common way of validating metamodels through subject expert inquiry on the domain application of the metamodel to assess whether the metamodel is reasonable and compatible based on the outcomes. For this purpose,six experts were nominated and selected to validate the developed DBFIM. From the expert review,the developed DBFIM was found to be complete, coherent, logical, scalable, interoperable, and useful for the DBFI field. 

    Fulltekst (pdf)
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  • 6.
    Alkhabbas, Fahed
    et al.
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT). Malmö universitet, Internet of Things and People (IOTAP).
    Alawadi, Sadi
    School of Information Technology, Halmstad University,Halmstad,Sweden.
    Ayyad, Majed
    Birzeit University,Department of Computer Science,Palestine.
    Spalazzese, Romina
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT). Malmö universitet, Internet of Things and People (IOTAP).
    Davidsson, Paul
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT). Malmö universitet, Internet of Things and People (IOTAP).
    ART4FL: An Agent-Based Architectural Approach for Trustworthy Federated Learning in the IoT2023Inngår i: 2023 Eighth International Conference on Fog and Mobile Edge Computing (FMEC), Institute of Electrical and Electronics Engineers (IEEE), 2023Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The integration of the Internet of Things (IoT) and Machine Learning (ML) technologies has opened up for the development of novel types of systems and services. Federated Learning (FL) has enabled the systems to collaboratively train their ML models while preserving the privacy of the data collected by their IoT devices and objects. Several FL frameworks have been developed, however, they do not enable FL in open, distributed, and heterogeneous IoT environments. Specifically, they do not support systems that collect similar data to dynamically discover each other, communicate, and negotiate about the training terms (e.g., accuracy, communication latency, and cost). Towards bridging this gap, we propose ART4FL, an end-to-end framework that enables FL in open IoT settings. The framework enables systems' users to configure agents that participate in FL on their behalf. Those agents negotiate and make commitments (i.e., contractual agreements) to dynamically form federations. To perform FL, the framework deploys the needed services dynamically, monitors the training rounds, and calculates agents' trust scores based on the established commitments. ART4FL exploits a blockchain network to maintain the trust scores, and it provides those scores to negotiating agents' during the federations' formation phase.

  • 7.
    Andersson, Robin
    Malmö universitet, Fakulteten för teknik och samhälle (TS).
    Combining Anomaly- and Signaturebased Algorithms for IntrusionDetection in CAN-bus: A suggested approach for building precise and adaptiveintrusion detection systems to controller area networks2021Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    With the digitalization and the ever more computerization of personal vehicles, new attack surfaces are introduced, challenging the security of the in-vehicle network. There is never such a thing as fully securing any computer system, nor learning all the methods of attack in order to prevent a break-in into a system. Instead, with sophisticated methods, we can focus on detecting and preventing attacks from being performed inside a system. The current state of the art of such methods, named intrusion detection systems (IDS), is divided into two main approaches. One approach makes its models very confident of detecting malicious activity, however only on activities that has been previously learned by this model. The second approach is very good at constructing models for detecting any type of malicious activity, even if never studied by the model before, but with less confidence. In this thesis, a new approach is suggested with a redesigned architecture for an intrusion detection system called Multi-mixed IDS. Where we take a middle ground between the two standardized approaches, trying to find a combination of both sides strengths and eliminating its weaknesses. This thesis aims to deliver a proof of concept for a new approach in the current state of the art in the CAN-bus security research field. This thesis also brings up some background knowledge about CAN and intrusion detection systems, discussing their strengths and weaknesses in further detail. Additionally, a brief overview from a handpick of research contributions from the field are discussed. Further, a simple architecture is suggested, three individual detection models are trained and combined to be tested against a CAN-bus dataset. Finally, the results are examined and evaluated. The results from the suggested approach shows somewhat poor results compared to other suggested algorithms within the field. However, it also shows some good potential, if better decision methods between the individual algorithms that constructs the model can be found. 

    Fulltekst (pdf)
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  • 8.
    Appelgren, Rasmus
    et al.
    Malmö universitet, Fakulteten för teknik och samhälle (TS).
    Ingvarsson, Linus
    Malmö universitet, Fakulteten för teknik och samhälle (TS).
    Användarens upplevelse av dark patterns på video-shorts2023Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Termen Dark Patterns började användas år 2012 och har sedan dess blivit ett omdebatterat ämne. Termen kan översättas till manipulerande designval som medvetet utformas för att påverka och styra användarna av applikationer, hemsidor och sociala medier. Forskare menar på att det kan användas för att påverka människor till att ta val de annars aldrig gjort och flertalet granskningar av befintliga media visar på att deras närvaro är hög. Dark patterns fungerar som ett paraplybegrepp över dessa designmönster och har bryts ned av flera forskare för att kunna förklara varje enskilt identifierat mönster och dess påverkan. Tidigare forskning har dock inte fokuserat på Dark Patterns i samband med sociala medier med inriktning korta videoklipp, så kallade video shorts. Den här uppsatsen ämnar att ta reda på hur användarens upplevelse av Dark Patterns närvaro i denna kontext påverkar användaren. För att ta reda på detta används en designbaserad forskningsmetod. Genom intervjuer samlas kvalitativ data in från tio deltagare som delats upp i två grupper. En grupp har fått använda en prototyp med Dark Patterns som författarna till uppsatsen identifierat vid en analys av de sociala medierna TikTok och Youtube Shorts. Den andra prototypen innehåller designval som agerar motsats till dessa Dark Pattern. Uppsatsen använder sedan en tematisk analys för att kunna se likheter samt olikheter i deltagarnas svar.  I resultatet presenteras sedan vilka mönster analysen givit, exempelvis föredrar flertalet deltagare designen som innehåller Dark Patterns till den grad att de inte känner sig uppenbart lurade. Subtila Dark Patterns visar sig påverka användarens upplevelse positivt, vilket får dem att vilja använda tjänsten mer, vilket också ligger i tjänstens intresse. Det mer aggressiva och uppenbara Dark Pattern upprörde dock deltagarna i större utsträckning och kan bidra till att användaren känner sig lurad och känner sig istället frustrerad och irriterad. 

    Fulltekst (pdf)
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  • 9.
    Argatov, Ivan
    et al.
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för materialvetenskap och tillämpad matematik (MTM). Malmö universitet, Biofilms Research Center for Biointerfaces. Institut für Mechanik Technische Universität Berlin, Berlin 10623 Germany.
    Jin, Xiaoqing
    College of Aerospace Engineering, Chongqing University, Chongqing, 400030, China.
    Gravitational settling of a cell on a high-aspect-ratio nanostructured substrate: An asymptotic modeling approach2022Inngår i: Applied Mathematical Modelling, ISSN 0307-904X, E-ISSN 1872-8480, Vol. 108, s. 294-307Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The problem of contact deformation of an elastic body loaded by gravitational forces and laying on several small rigid supports is considered in the framework of the linear theory of elasticity. Using the method of matched asymptotic expansions, the limit asymptotic model for determining the support reactions and the kinematic parameters of the body settling is derived. The effect of the body surface reinforcement is discussed. The case of a uniform (symmetric) settling is considered in detail.

    Fulltekst (pdf)
    fulltext
  • 10.
    Ashouri, Majid
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT). Malmö universitet, Internet of Things and People (IOTAP).
    Towards Supporting IoT System Designers in Edge Computing Deployment Decisions2021Licentiatavhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    The rapidly evolving Internet of Things (IoT) systems demands addressing new requirements. This particularly needs efficient deployment of IoT systems to meet the quality requirements such as latency, energy consumption, privacy, and bandwidth utilization. The increasing availability of computational resources close to the edge has prompted the idea of using these for distributed computing and storage, known as edge computing. Edge computing may help and complement cloud computing to facilitate deployment of IoT systems and improve their quality. However, deciding where to deploy the various application components is not a straightforward task, and IoT system designer should be supported for the decision.

    To support the designers, in this thesis we focused on the system qualities, and aimed for three main contributions. First, by reviewing the literature, we identified the relevant and most used qualities and metrics. Moreover, to analyse how computer simulation can be used as a supporting tool, we investigated the edge computing simulators, and in particular the metrics they provide for modeling and analyzing IoT systems in edge computing. Finally, we introduced a method to represent how multiple qualities can be considered in the decision. In particular, we considered distributing Deep Neural Network layers as a use case and raked the deployment options by measuring the relevant metrics via simulation.

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  • 11.
    Ashouri, Majid
    et al.
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT). Malmö universitet, Internet of Things and People (IOTAP).
    Davidsson, Paul
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT). Malmö universitet, Internet of Things and People (IOTAP).
    Spalazzese, Romina
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT). Malmö universitet, Internet of Things and People (IOTAP).
    Quality attributes in edge computing for the Internet of Things: A systematic mapping study2021Inngår i: Internet of Things: Engineering Cyber Physical Human Systems, E-ISSN 2542-6605, Vol. 13, artikkel-id 100346Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Many Internet of Things (IoT) systems generate a massive amount of data needing to be processed and stored efficiently. Cloud computing solutions are often used to handle these tasks. However, the increasing availability of computational resources close to the edge has prompted the idea of using these for distributed computing and storage. Edge computing may help to improve IoT systems regarding important quality attributes like latency, energy consumption, privacy, and bandwidth utilization. However, deciding where to deploy the various application components is not a straightforward task. This is largely due to the trade-offs between the quality attributes relevant for the application. We have performed a systematic mapping study of 98 articles to investigate which quality attributes have been used in the literature for assessing IoT systems using edge computing. The analysis shows that time behavior and resource utilization are the most frequently used quality attributes; further, response time, turnaround time, and energy consumption are the most used metrics for quantifying these quality attributes. Moreover, simulation is the main tool used for the assessments, and the studied trade-offs are mainly between only two qualities. Finally, we identified a number of research gaps that need further study.

    Fulltekst (pdf)
    fulltext
  • 12.
    Ashouri, Majid
    et al.
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT).
    Lorig, Fabian
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT).
    Davidsson, Paul
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT).
    Spalazzese, Romina
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT).
    Edge Computing Simulators for IoT System Design: An Analysis of Qualities and Metrics2019Inngår i: Future Internet, E-ISSN 1999-5903, Vol. 11, nr 11, s. 235-246Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The deployment of Internet of Things (IoT) applications is complex since many quality characteristics should be taken into account, for example, performance, reliability, and security. In this study, we investigate to what extent the current edge computing simulators support the analysis of qualities that are relevant to IoT architects who are designing an IoT system. We first identify the quality characteristics and metrics that can be evaluated through simulation. Then, we study the available simulators in order to assess which of the identified qualities they support. The results show that while several simulation tools for edge computing have been proposed, they focus on a few qualities, such as time behavior and resource utilization. Most of the identified qualities are not considered and we suggest future directions for further investigation to provide appropriate support for IoT architects.

    Fulltekst (pdf)
    fulltext
  • 13.
    Ashouri, Majid
    et al.
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT). Malmö universitet, Internet of Things and People (IOTAP).
    Lorig, Fabian
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT). Malmö universitet, Internet of Things and People (IOTAP).
    Davidsson, Paul
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT). Malmö universitet, Internet of Things and People (IOTAP).
    Spalazzese, Romina
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT). Malmö universitet, Internet of Things and People (IOTAP).
    Svorobej, Sergej
    School of Computer Science and Statistics, Trinity College Dublin, Dublin 2, Ireland.
    Analyzing Distributed Deep Neural Network Deployment on Edge and Cloud Nodes in IoT Systems2020Inngår i: IEEE International Conference on Edge Computing (EDGE), Virtual conference, October 18–24, 2020., 2020, s. 59-66Konferansepaper (Fagfellevurdert)
    Abstract [en]

    For the efficient execution of Deep Neural Networks (DNN) in the Internet of Things, computation tasks can be distributed and deployed on edge nodes. In contrast to deploying all computation to the cloud, the use of Distributed DNN (DDNN) often results in a reduced amount of data that is sent through the network and thus might increase the overall performance of the system. However, finding an appropriate deployment scenario is often a complex task and requires considering several criteria. In this paper, we introduce a multi-criteria decision-making method based on the Analytical Hierarchy Process for the comparison and selection of deployment alternatives. We use the RECAP simulation framework to model and simulate DDNN deployments on different scales to provide a comprehensive assessment of deployments to system designers. In a case study, we apply the method to a smart city scenario where different distributions and deployments of a DNN are analyzed and compared.

  • 14.
    Bagheri, Sally
    et al.
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT).
    Jacobsson, Andreas
    Malmö universitet, Internet of Things and People (IOTAP). Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT).
    Davidsson, Paul
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT). Malmö universitet, Internet of Things and People (IOTAP).
    Smart Homes as Digital Ecosystems: Exploring Privacy in IoT Contexts2024Inngår i: Proceedings of the 10th International Conference on Information Systems Security and Privacy / [ed] Gabriele Lenzini; Paolo Mori; Steven Furnell, Portugal: SciTePress, 2024, s. 869-877Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Although smart homes are tasked with an increasing number of everyday activities to keep users safe, healthy, and entertained, privacy concerns arise due to the large amount of personal data in flux. Privacy is widely acknowledged to be contextually dependent, however, the interrelated stakeholders involved in developing and delivering smart home services – IoT developers, companies, users, and lawmakers, to name a few – might approach the smart home context differently. This paper considers smart homes as digital ecosystems to support a contextual analysis of smart home privacy. A conceptual model and an ecosystem ontology are proposed through design science research methodology to systematize the analyses. Four privacy-oriented scenarios of surveillance in smart homes are discussed to demonstrate the utility of the digital ecosystem approach. The concerns pertain to power dynamics among users such as main users, smart home bystanders, parent-child dynamics, and intimate partner relationships and the responsibility of both companies and public organizations to ensure privacy and the ethical use of IoT devices over time. Continuous evaluation of the approach is encouraged to support the complex challenge of ensuring user privacy in smart homes.

  • 15.
    Bajones, Markus
    et al.
    TU Wien, Vienna, Austria..
    Fischinger, David
    TU Wien, Vienna, Austria..
    Weiss, Astrid
    TU Wien, Vienna, Austria..
    De La Puente, Paloma
    Univ Politecn Madrid, Madrid, Spain..
    Wolf, Daniel
    TU Wien, Vienna, Austria..
    Vincze, Markus
    TU Wien, Vienna, Austria..
    Koertner, Tobias
    Acad Aging Res, Vienna, Austria..
    Weninger, Markus
    Acad Aging Res, Vienna, Austria..
    Papoutsakis, Konstantinos
    FORTH, Iraklion, Greece..
    Michel, Damien
    FORTH, Iraklion, Greece..
    Qammaz, Ammar
    FORTH, Iraklion, Greece..
    Panteleris, Paschalis
    FORTH, Iraklion, Greece..
    Foukarakis, Michalis
    FORTH, Iraklion, Greece..
    Adami, Ilia
    FORTH, Iraklion, Greece..
    Ioannidi, Danae
    FORTH, Iraklion, Greece..
    Leonidis, Asterios
    FORTH, Iraklion, Greece..
    Antona, Margherita
    FORTH, Iraklion, Greece..
    Argyros, Antonis
    FORTH, Iraklion, Greece..
    Mayer, Peter
    TU Wien, Vienna, Austria..
    Panek, Paul
    TU Wien, Vienna, Austria..
    Eftring, Håkan
    Lund Univ, Lund, Sweden..
    Frennert, Susanne
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT). Malmö universitet, Internet of Things and People (IOTAP). Malmo Univ, Malmo, Sweden..
    Results of Field Trials with a Mobile Service Robot for Older Adults in 16 Private Households2019Inngår i: ACM Transactions on Human-Robot Interaction, E-ISSN 2573-9522, Vol. 9, nr 2, s. 10:1-10:27, artikkel-id 10Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this article, we present results obtained from field trials with the Hobbit robotic platform, an assistive, social service robot aiming at enabling prolonged independent living of older adults in their own homes. Our main contribution lies within the detailed results on perceived safety, usability, and acceptance from field trials with autonomous robots in real homes of older users. In these field trials, we studied how 16 older adults (75 plus) lived with autonomously interacting service robots over multiple weeks. Robots have been employed for periods of months previously in home environments for older people, and some have been tested with manipulation abilities, but this is the first time a study has tested a robot in private homes that provided the combination of manipulation abilities, autonomous navigation, and nonscheduled interaction for an extended period of time. This article aims to explore how older adults interact with such a robot in their private homes. Our results show that all users interacted with Hobbit daily, rated most functions as well working, and reported that they believe that Hobbit will be part of future elderly care. We show that Hobbit's adaptive behavior approach towards the user increasingly eased the interaction between the users and the robot. Our trials reveal the necessity to move into actual users' homes, as only there, we encounter real-world challenges and demonstrate issues such as misinterpretation of actions during non-scripted human-robot interaction.

    Fulltekst (pdf)
    fulltext
  • 16.
    Banda, Laurence
    et al.
    Wits Business School (WBS), University of the Witwatersrand (Wits), Johannesburg, South Africa.
    Mjumo, Mzyece
    Wits Business School (WBS), University of the Witwatersrand (Wits), Johannesburg, South Africa.
    Mekuria, Fisseha
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT). Malmö universitet, Internet of Things and People (IOTAP). Wits Business School (WBS), University of the Witwatersrand (Wits), Johannesburg, South Africa.
    Business Models for 5G and Future Mobile Network Operators2022Inngår i: 2022 IEEE Future Networks World Forum (FNWF), IEEE, 2022, artikkel-id M17754Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Emerging 5G and future networks (5GFNs) will change the mobile communication business ecosystem by introducing multi-service wireless applications with diverse specifications. These smart and future-oriented wireless networks are intended to address not only consumer-based smartphone applications, but also the needs of various vertical industry markets (e.g., education, energy, healthcare, transportation, manufacturing, agriculture, and so forth). 5GFNs are aimed at attaining economic value for all key stakeholders, including customers, mobile network operators (MNOs), equipment vendors, public institutions, private enterprises, digital business start-ups and various third parties. This paper discusses business model options for 5GFNs from the MNOs’ perspective.  We describe current MNOs’ business models and their shortcomings. Thereafter, we present emerging business models for 5GFNs which MNOs should consider when rolling out these networks.  

  • 17.
    Banda, Laurence
    et al.
    Univ Witwatersrand, Wits Business Sch WBS, ZA-2000 Johannesburg, South Africa..
    Mzyece, Mjumo
    Univ Witwatersrand, Wits Business Sch WBS, ZA-2000 Johannesburg, South Africa..
    Mekuria, Fisseha
    Univ Witwatersrand, Wits Business Sch WBS, ZA-2000 Johannesburg, South Africa.;Council Sci & Ind Res CSIR, ZA-0001 Pretoria, South Africa..
    5G Business Models for Mobile Network Operators-A Survey2022Inngår i: IEEE Access, E-ISSN 2169-3536, Vol. 10, s. 94851-94886Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Emerging Fifth-generation (5G) mobile networks and associated technologies are expected to provide multi-service wireless applications with diverse specifications intended to address not only consumer-based smartphone applications, but also the needs of various vertical industry markets (e.g., healthcare, education, energy, mining, agriculture, manufacturing, and so forth). This paper extends 5G networks' technology orientation towards attaining economic value for all key 5G stakeholders, including customers, mobile network operators (MNOs), equipment vendors, public institutions, private enterprises, digital business start-ups and other third parties. Although several surveys and tutorials have discussed business models in connection with 5G networks, there is no comprehensive study on business models for emerging 5G networks from the MNO's perspective. In this survey article, we present and investigate key advances on business models for 5G networks and 5G MNOs in particular, from industry, use cases and research community perspectives. The paper focuses the theoretical business model concept from both strategic management and technological innovation perspectives. Thereafter, we discuss conventional business models for MNOs before presenting particular disruptive business models which can be considered for rolling out 5G networks with an aim to improve business efficiency. Additionally, the paper explores the emerging network deployment concept of private 5G networks and their related business models. Finally, we present some of the open research challenges and provide possible guidelines for implementing 5G business models based on various countries' socio-economic status and relevant 5G use cases applicable in a specific context of emerging economies.

  • 18.
    Bauer, Anton
    et al.
    Malmö universitet, Fakulteten för teknik och samhälle (TS).
    Lundin, Eric
    Malmö universitet, Fakulteten för teknik och samhälle (TS).
    Deep Machine Learning and Smartphone IMUs for DistanceEstimation: Applications in the 6MWT and Beyond2024Independent thesis Basic level (university diploma), 10 poäng / 15 hpOppgave
    Abstract [en]

    This thesis explores the use of machine learning (ML) and smartphone sensors to improve indoordistance estimation, a critical aspect of healthcare tests like the 6-minute walk test (6MWT). In order to make tests like the 6MWT more available, and lower the barrier for a patient toget tested, there are multiple problems which need to be solved: How can the distance data needed for these tests be collected reliably and remotely, and without having to rely on the patient reporting correct data; How can these tests be performed indoors, without relying on GPS or other GNSS, which are unreliable indoors. To tackle these challenges a convolutional neural network (CNN) trained on a dataset containing continuous ground truth was employed. An enhancement of an existing CNN model was done by collecting more training data, tuning hyper parameters, and testing it on a diverse dataset.

    The results of this thesis shows that when predicting distance walked on data from participants the CNN model has seen before, the precision meets clinical minimum for being able to show a change in the health condition. On real world data the performance suffers. Despite limitations due to the scope of data collection, the results still underscores the potential of ML for accurate and efficient indoor distance estimation and points to future research directions.

    Fulltekst (pdf)
    fulltext
  • 19.
    Bengtsson, Mattias
    et al.
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT).
    Sandgren, Daniel
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT).
    Tillgängliga AI-verktyg och -tekniker för att automatisera uppgifter som hindrar lärare inom högre utbildning från att undervisa: En strukturerad litteraturstudie2023Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Denna strukturerade litteraturstudie undersöker vilka verktyg och tekniker relaterade tillartificiell intelligens (AI) som kan understödja lärare genom att överta repetitiva ochtidskrävande administrativa uppgifter som ligger utanför den direkta interaktionen mellanlärare och student. Genom att granska tillgänglig forskning inom detta område kartläggervi dessa. Denna kartläggning följs sedan av en diskussion om resultatet och potentialen iden senaste tekniken samt en fingervisning om var ytterligare forskning kan ta vid.

    För att kartlägga befintlig forskning i ämnet har denna litteraturstudie genomförts medutgångspunkt i en generell kurs uppdelad i tre faser: före, under och efter. På grund avden potentiella omfattningen av detta område undersökte vi ett fall per fas, respektivekursdesign, rättning och kursutvärdering. Litteraturstudien är begränsad till högre utbild-ningsinstitutioner såsom universitet och högskolor.

    Våra resultat visar att majoriteten av de AI-verktyg och -tekniker som används inomdessa tre områden är baserade på naturlig språkbearbetning (NLP) och neurala nätverk.Vi fann att det finns en större mängd forskning inom rättning jämfört med kursdesign ochkursutvärdering, och att forskningen inom alla dessa områden ökar över tiden. Vi noterardock en brist på forskning som undersöker den praktiska användningen av dessa verktygoch tekniker av lärare.

    Fulltekst (pdf)
    fulltext
  • 20. Berggren, Magnus
    et al.
    Stjernberg, Louise
    BTH.
    Lindström, Fredric
    Claesson, Ingvar
    Audio Processing Solution for Video Conference Based Aerobics2010Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In this paper an audio processing solution for video conference based aerobics is presented. The proposed solution leaves the workout music unaltered by separating it from the speech and processing each signal separately. The speech signal processing is also performed at a lower sample rate, which saves computational power. Real time evaluation of the system shows that high quality music as well as a good two-way communication is maintained during the aerobic session.

    Fulltekst (pdf)
    fulltext
  • 21.
    Bezerra, Thomas
    et al.
    Malmö universitet, Fakulteten för teknik och samhälle (TS).
    Rockström, Truls
    Malmö universitet, Fakulteten för teknik och samhälle (TS).
    Visually Difficult: The Effect of Graphics on Performative Difficulty in Games2023Independent thesis Basic level (degree of Bachelor), 180 hpOppgave
    Abstract [en]

    Designing entertaining games requires control over the difficulty experienced by players. Gameplay has a clear impact on the difficulty and as such is easy to handle but other factors such as graphics do not share this clear cut impact. Therefore a game was made with adjustable graphical settings without changing any game elements in order to evaluate the effect on 18 participants. No effect was found for the measured performance but a weak correlation is possible for perceived difficulty.

    Fulltekst (pdf)
    fulltext
  • 22.
    Bjørnskau, Torkel
    et al.
    Transportøkonomisk institutt, Oslo.
    Assum, Terje
    Transportøkonomisk institutt, Oslo.
    Eriksson, Louise
    Statens väg- och transportforskningsinstitut, Mobilitet, aktörer och planering, MAP.
    Hrelja, Robert
    Statens väg- och transportforskningsinstitut, Mobilitet, aktörer och planering, MAP.
    Nyberg, Jonna
    Statens väg- och transportforskningsinstitut, Mobilitet, aktörer och planering, MAP.
    Personvern og ITS-baserte trafikksikkerhetstiltak: en studie av streknings-ATK, automatisk fartstilpasning (ISA) og atferdsregistrator (EDR)2010Rapport (Annet vitenskapelig)
    Abstract [no]

    Nye ITS-baserte trafikksikkerhetstiltak som kan brukes til å registrere og regulere uønsket atferd i trafikken, har et stort potensial for å øke trafikksikkerheten. Men de kan komme i konflikt med personvernet. Streknings-ATK og EDR har klare implikasjoner for personvernet og at ISA kan ha det om data fra ISA-systemet lagres. Konsekvensene for personvernet er tolket ulikt i Norge og Sverige. Prøvedrift med streknings-ATK på flere strekninger er startet opp i Norge, men i Sverige er dette ikke aktuelt pga. hensynet til personvern. I begge land installeres ISA i offentlige tjenestebiler. EDR har fått liten oppmerksomhet i begge land. Bileierne er overveiende positive til både streknings-ATK og ISA. Jo større forståelsen for at fart er en risikofaktor, desto større er aksepten for slike fartsregulerende tiltak. Bileierne er mest skeptiske til atferdsregistratorer som i dag er lite kjent. Atferdsregistratorer, som ?event data recorder? eller ?black box?, er imidlertid i ferd med å bli svært vanlige i moderne biler ? og stadig mer data fra kjøretøyene lagres. Bileiere bør derfor i større grad få informasjon om dette og tilgang til de data som registreres.

    Fulltekst (pdf)
    FULLTEXT01
  • 23.
    Brondin, Anna
    et al.
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT).
    Nordström, Marcus
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT).
    Olsson, Carl Magnus
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT). Malmö universitet, Internet of Things and People (IOTAP).
    Salvi, Dario
    Malmö universitet, Internet of Things and People (IOTAP). Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT).
    Open source step counter algorithm for wearable devices2020Inngår i: Companion Proceedings of the 10th International Conference on the Internet of Things (IoT 2020), New York, United States: ACM Digital Library, 2020, artikkel-id 6Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Commercial wearable devices and fitness trackers are commonly sold as black boxes of which little is known about their accuracy. This poses serious issues especially in health-related contexts such as clinical research, where transparency about accuracy and reliability are paramount.

    We present a validated algorithm for computing step counting that is optimised for use in constrained computing environments. Released as open source, the algorithm is based on the windowed peak detection approach, which has previously shown high accuracy on smartphones. The algorithm is optimised to run on a programmable smartwatch (Pine Time) and tested on 10 subjects in 8 scenarios, with varying varying positions of the wearable and walking paces.

    Our approach achieves a 89% average accuracy, with the highest average accuracy when walking outdoor (98%) and the lowest in a slow-walk scenario (77%). This result can be compared with the built-in step counter of the smartwatch (Bosch BMA421), which yielded a 94% average accuracy for the same use cases. Our work thus shows that an open-source approach for extracting physical activity data from wearable devices is possible and achieves an accuracy comparable to the one produced by proprietary embedded algorithms.

    Fulltekst (pdf)
    fulltext
  • 24.
    Bucuroiu, Denisa Maria
    Malmö universitet, Fakulteten för kultur och samhälle (KS), Institutionen för konst, kultur och kommunikation (K3).
    Emergent Social Interactions between a Hospital Patient and a Service Robot: A Research Through Design inquiry into the social dynamics of the interaction framework hospital patient, service robot, caregiver2021Independent thesis Basic level (degree of Bachelor), 15 poäng / 22,5 hpOppgave
    Abstract [en]

    The following documents a research through design inquiry into how socialites of a hospital environment are disrupted or improved by implementing a service robot. The robot, support for excessive work, represents a new intermediary between a patient and a caregiver. Robotic work routines appear as better, more efficient, and more affordable. Apart from other ethical and inclusive considerations given to this dialogue, the social values hidden in traditional workflows are of equal importance. 

    This thesis attempts to generate constructive design research about emergent social norms and social dynamics caused by service robots’ implementation. The lessons learned are presented in a final research discussion. Further applied, the knowledge held common grounds with a rehabilitation robot developed by Blue Ocean Robotics. 

    Fulltekst (pdf)
    fulltext
  • 25.
    Bugeja, Joseph
    et al.
    Malmö universitet, Internet of Things and People (IOTAP). Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT).
    Jacobsson, Andreas
    Malmö universitet, Internet of Things and People (IOTAP). Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT).
    Green Intelligent Homes: A Perspective on the Future of Smart Homes and Their Implications2023Inngår i: Proceedings of the 8th International Conference on Internet of Things, Big Data and Security (IoTBDS 2023). / [ed] Gary, Wills; Buttyán, Levante; Kacuk, Péter; Chang, Victor, Portugal, 2023, s. 186-193Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The smart home technology market is witnessing rapid growth due to the advent of more advanced, intuitive, and affordable solutions. As the adoption of these technologies becomes more prevalent, there is a need for research to explore potential avenues for pervasive smart living. This study aims to review the available literature and industry studies, along with our own experiences in the field, to identify and discuss potential future research in the smart home. We observe that the future of the smart home will likely be focused on improving the user experience, with a greater emphasis on personalization, automation, and Artificial intelligence (AI)-driven technologies, leading to what we call the "Green Intelligent Home". Through this analysis, this study aims to offer insights into how the development of smart homes could shape society in the future and the potential implications of such a development. This study concludes by suggesting a framework for knowledge development in the smart home domain.

    Fulltekst (pdf)
    fulltext
  • 26.
    Bugeja, Joseph
    et al.
    Malmö högskola, Fakulteten för teknik och samhälle (TS).
    Jacobsson, Andreas
    Malmö högskola, Fakulteten för teknik och samhälle (TS).
    Davidsson, Paul
    Malmö högskola, Fakulteten för teknik och samhälle (TS).
    On Privacy and Security Challenges in Smart Connected Homes2016Inngår i: Proceedings: 2016 European Intelligence and Security Informatics Conference, IEEE, 2016Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Smart homes have become increasingly popular for IoT products and services with a lot of promises for improving the quality of life of individuals. Nevertheless, the heterogeneous, dynamic, and Internet-connected nature of this environment adds new concerns as private data becomes accessible, often without the householders’ awareness. This accessibility alongside with the rising risks of data security and privacy breaches, makes smart home security a critical topic that deserves scrutiny. In this paper, we present an overview of the privacy and security challenges directed towards the smart home domain. We also identify constraints, evaluate solutions, and discuss a number of challenges and research issues where further investigation is required.

    Fulltekst (pdf)
    FULLTEXT01
  • 27.
    Chang, Jianghao
    et al.
    Hebei GEO Univ, Sch Explorat Technol & Engn, Shijiazhuang 050031, Hebei, Peoples R China..
    Su, Benyu
    China Univ Min & Technol, Sch Resources & Geosci, Xuzhou 221116, Jiangsu, Peoples R China..
    Malekian, Reza
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT).
    Xing, Xiuju
    Xian Res Inst Co Ltd, China Coal Technol & Engn Grp Corp, Xian 710077, Shaanxi, Peoples R China..
    Detection of Water-Filled Mining Goaf Using Mining Transient Electromagnetic Method2020Inngår i: IEEE Transactions on Industrial Informatics, ISSN 1551-3203, E-ISSN 1941-0050, Vol. 16, nr 5, s. 2977-2984Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Water-filled mining goaves are extremely prone to water inrush accidents in coal mines, and the transient electromagnetic method (TEM) is a good geophysical method for detecting water-rich areas. Considering that conventional TEM was mainly carried out on the ground, to increase the detection resolution, the underground TEM was used to detect the water-filled goaves in this study. Based on the whole-space model, the data-processing method of the underground TEM was studied. The whole-space geoelectric model was established based on actual coal-measure strata data, and the whole-space TEM response of the water-filled goaves was modeled using the finite-difference time-domain method. The results showed that the low-resistance areas of the apparent resistivity contours can accurately reflect the water abundance of the mining goaves. The underground TEM was used to detect the water abundance of the mining goaf in a mine environment and its detection results were consistent with the actual results.

  • 28.
    Ciccozzi, Federico
    et al.
    School of Innovation,Design and Engineering, Mälardalen University, Västerås, Sweden.
    Spalazzese, Romina
    Malmö högskola, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT). Malmö högskola, Internet of Things and People (IOTAP).
    MDE4IoT: Supporting the Internet of Things with Model-Driven Engineering2017Inngår i: Intelligent Distributed Computing X / [ed] Badica, C Seghrouchni, AE Beynier, A Camacho, D Herpson, C Hindriks, K Novais, P, Springer, 2017, s. 67-76Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The Internet of Things (IoT) unleashes great opportunities to improve our way of living and working through a seamless and highly dynamic cooperation among heterogeneous things including both computer-based systems and physical objects. However, properly dealing with the design, development, deployment and runtime management of IoT applications means to provide solutions for a multitude of challenges related to intelligent distributed systems within the IoT. In this paper we propose Model-Driven Engineering (MDE) as a key enabler for applications running on intelligent distributed loT systems. MDE helps in tackling challenges and supporting the lifecycle of such systems. Specifically, we introduce MDE4IoT, an MDE approach enabling the modelling of things and supporting intelligence as self-adaptation of Emergent Configurations in the IoT. Moreover, we show how MDE, and in particular MDE4IoT, can help in tackling several challenges by providing the Smart Street Lights concrete case.

  • 29.
    Dahl, Ola
    et al.
    Malmö högskola, Teknik och samhälle (TS).
    Heyden, Anders
    Malmö högskola, Teknik och samhälle (TS).
    Dynamic Structure and Motion Estimation based on Non-linear Adaptive Observers2008Inngår i: 2008 19th International Conference on Pattern Recognition, 2008Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Structure and motion estimation from long image sequences is a an important and difficult problem in computer vision. We propose a novel approach based on nonlinear and adaptive observers based on a dynamic model of the motion. The estimation of the threedimensional position and velocity of the camera as well as the three-dimensional structure of the scene is done by observing states and parameters of a nonlinear dynamic system, containing a perspective transformation in the output equation, often referred to as a perspective dynamic system. An advantage of the proposed method is that it is filter-based, i.e. it provides an estimate of structure and motion at each time instance, which is then updated based on a novel image in the sequence. The observer demonstrates a trade-off compared to a more computer vision oriented approach, where no specific assumptions regarding the motion dynamics are required, but instead additional feature points are needed. Finally, the performance of the proposed method is shown in simulated experiments.

    Fulltekst (pdf)
    FULLTEXT01
  • 30.
    Dahl, Ola
    et al.
    Malmö högskola, Teknik och samhälle (TS).
    Heyden, Anders
    Malmö högskola, Teknik och samhälle (TS).
    Exact Observer Error Linearization for Perspective Dynamic Systems2008Inngår i: Procedings SSBA 2008, Swedish Society for Automated Image Analysis , 2008, s. 43-46Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    Estimation of 3D position information from 2D images in computer vision systems can be formulated as a state estimation problem for a nonlinear perspective dynamic system. The state estimation can be performed using different kinds of nonlinear observers. In this paper we investigate observer error linearization, where the goal is to find a coordinate transformation that results in a system for which a linear observer can be constructed. It is shown that using a state transformation combined with an output transformation, the system admits an observer form which leads to an observer with linear error dynamics.

    Fulltekst (pdf)
    FULLTEXT01
  • 31.
    Dahl, Ola
    et al.
    Malmö högskola, Teknik och samhälle (TS).
    Heyden, Anders
    Malmö högskola, Teknik och samhälle (TS).
    Nyberg, Fredrik
    Malmö högskola, Teknik och samhälle (TS).
    Provably stable nonlinear and adaptive observers for dynamic structure and motion estimation2007Inngår i: International Conference on Dynamic Vision;III, 2007Konferansepaper (Fagfellevurdert)
  • 32.
    Dahl, Ola
    et al.
    Malmö högskola, Teknik och samhälle (TS).
    Nyberg, Fredrik
    Malmö högskola, Teknik och samhälle (TS).
    Heyden, Anders
    Malmö högskola, Teknik och samhälle (TS).
    Nonlinear and Adaptive Observers for Perspective Dynamic Systems2007Inngår i: Proceedings American Control Conference, IEEE, 2007, s. 2230-2235Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Estimation of 3D structure and motion from 2D images in computer vision systems can be performed using a dynamic system, often referred to as a perspective dynamic system. This paper presents a novel parametrization of the nonlinear perspective dynamic system, from which different estimators for rigid body structure as well as motion can be derived in a straightforward manner. The parametrization allows a structure estimator to be formulated as a nonlinear observer which estimates 3D position, assuming knowledge of angular and linear velocities. The observer performance is demonstrated using simulation examples, where it is also shown how a time scaling parameter can be used to tune the transient response. The parametrization also allows a motion estimator to be formulated as an adaptive observer, estimating angular velocity and 3D position assuming knowledge of the linear velocity. This is demonstrated by deriving an estimator and illustrating its performance in a simulation example. The presented investigations and simulations indicate that the parametrization has a potential for future development of estimators for structure as well as motion in perspective dynamic systems, and for the investigation of similarities and differences in comparison to discrete, projective geometry based, methods.

  • 33.
    Dahl, Ola
    et al.
    Malmö högskola, Teknik och samhälle (TS).
    Nyberg, Fredrik
    Malmö högskola, Teknik och samhälle (TS).
    Heyden, Anders
    Malmö högskola, Teknik och samhälle (TS).
    On Observer Error Linearization for Perspective Dynamic Systems2007Inngår i: Proceedings American Control Conference, IEEE, 2007Konferansepaper (Fagfellevurdert)
    Abstract [en]

    State estimation in perspective dynamic systems can be performed using different kinds of nonlinear observers. In this paper we investigate observer error linearization for perspective dynamic systems, where the goal is to find a coordinate transformation that results in a system for which a linear observer can be constructed. We present preliminary results in this direction, showing that such linearizing coordinate transformations indeed exist, subject to certain constraints on the angular and linear velocities. Specifically, it is shown that in many situations a linearizing coordinate transformation can be found only when additional states are added to the original system. This results in what is referred to as dynamic observer error linearization. Our investigations further provide additional insight into observability issues for perspective dynamic systems by showing how an observability condition can be interpreted in terms of the focus of expansion, and how the condition is related to the derivation of appropriate coordinate transformations.

  • 34.
    Dahl, Ola
    et al.
    Malmö högskola, Teknik och samhälle (TS).
    Nyberg, Fredrik
    Malmö högskola, Teknik och samhälle (TS).
    Heyden, Anders
    Malmö högskola, Teknik och samhälle (TS).
    Structure and Motion Estimation in Perspective Systems using a Dynamic Vision Parametrization2007Inngår i: 2007 European Control Conference (ECC), European Control Society , 2007Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Estimation of 3D structure and motion from 2D images in computer vision systems can be performed using a nonlinear dynamic system, often referred to as a perspective dynamic system. In this paper we describe how a specific parametrization of the perspective dynamic system can be utilized when formulating estimation problems for structure and motion. The parametrization allows for a single estimation problem formulation which is applicable to structure estimation as well as motion estimation. The parameters to be estimated appear explicitly in the resulting dynamic system, and available partial knowledge of parameters can be taken into account in a straightforward manner. The problem formulation allows estimators for structure and motion to be derived using available methods from nonlinear and adaptive control. We demonstrate how estimators for structure and motion can be constructed based on the parametrization, and illustrate the estimation performance by simulations. In this way, it is demonstrated how a nonlinear observer can be used for motion estimation as well as recovery of three-dimensional position in a monocular vision system, using measurements from two-dimensional images.

  • 35.
    Dahl, Ola
    et al.
    Malmö högskola, Teknik och samhälle (TS).
    Want, Y
    Dept. of Electrical & Computer Engineering, University of Alberta, Edmonton, Alberta, Canada.
    Lynch, A. F.
    Dept. of Electrical & Computer Engineering, University of Alberta, Edmonton, Alberta, Canada.
    Heyden, Anders
    Malmö högskola, Teknik och samhälle (TS).
    Observer Forms for Perspective Systems2008Inngår i: Proceedings of the 17th World Congress The International Federation of Automatic Control Seoul, Korea, July 6-11, 2008, IFAC Papers Online, 2008, Vol. 41:2, s. 8618-8623Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Estimation of 3D position information from 2D images in computer vision systems can be formulated as a state estimation problem for a nonlinear perspective dynamic system. The multi-output state estimation problem has been treated by several authors using methods for nonlinear observer design. This paper shows that a perspective system can be transformed to two observer forms, and provides constructive methods for arriving at the transformations. These observer forms lead to straightforward observer designs. First, it is shown that using an output transformation, the system admits an observer form which leads to an observer with linear error dynamics. A second observer design is based on a time scaled block triangular form. Both designs assume a commonly used observability condition. The designs are demonstrated in simulation.

    Fulltekst (pdf)
    fulltext
  • 36.
    Dahlgren, Linnea
    et al.
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT).
    Nejsum, Gavin
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT).
    Digital Applications for Laboratory Sessions in Electronics Courses2021Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    In 2020 the need to have electronics laboratory sessions digitally arose because of the COVID-19 pandemic. Even though it was a pandemic the new engineering students came to the university to perform their laboratory sessions. As a result, it was realized that there was a lack of knowledge in selecting a suitable application for the laboratory sessions. This thesis aims to research what applications that are available and suitable for digital electronics laboratory sessions. There are two main types of digital programs, simulators and remote laboratories. Although, in this thesis, only simulators were tested. A comparative study was done using a mixed-method containing an interview, a literature study, a specification review, and a case study. The interview was conducted with the two lecturers of the course DA215A. The case study resulted in qualitative data from six applications where five of them were deemed suitable for a simple laboratory session, and one was fitting for more advanced sessions. All the programs have different advantages meaning that when choosing an application that is to be used in a course, knowing its purpose is vital. 

    Fulltekst (pdf)
    fulltext
  • 37.
    de Hoop, Maarten, V
    et al.
    Simons Department in Computational and Applied Mathematics and Earth Science, Rice University, Houston, 77005, TX, United States.
    Iantchenko, Alexei
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för materialvetenskap och tillämpad matematik (MTM).
    van der Hilst, Robert D.
    Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, 02139, MA, United States.
    Zhai, Jian
    Institute for Advanced Study, Hong Kong University of Science and Technology, Kowloon, Hong Kong.
    Semiclassical inverse spectral problem for seismic surface waves in isotropic media: part I. Love waves2020Inngår i: Inverse Problems, ISSN 0266-5611, E-ISSN 1361-6420, Vol. 36, nr 7, artikkel-id 075015Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We analyze the inverse spectral problem on the half line associated with elastic surface waves. Here, we focus on Love waves. Under certain generic conditions, we establish uniqueness and present a reconstruction scheme for theS-wavespeed with multiple wells from the semiclassical spectrum of these waves.

  • 38.
    de Hoop, Maarten, V
    et al.
    Simons Department in Computational and Applied Mathematics and Earth Science, Rice University, Houston, 77005, TX, United States.
    Iantchenko, Alexei
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för materialvetenskap och tillämpad matematik (MTM). Malmö universitet, Biofilms Research Center for Biointerfaces.
    van der Hilst, Robert D.
    Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, 02139, MA, United States.
    Zhai, Jian
    Institute for Advanced Study, Hong Kong University of Science and Technology, Kowloon, Hong Kong.
    Semiclassical inverse spectral problem for seismic surface waves in isotropic media: part II. Rayleigh waves2020Inngår i: Inverse Problems, ISSN 0266-5611, E-ISSN 1361-6420, Vol. 36, nr 7, artikkel-id 075016Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We analyze the inverse spectral problem on the half line associated with elastic surface waves. Here, we extend the treatment of Love waves [5] to Rayleigh waves. Under certain conditions, and assuming that the Poisson ratio is constant, we establish uniqueness and present a reconstruction scheme for the S-wave speed with multiple wells from the semiclassical spectrum of these waves.

  • 39.
    Demirovic, Amar
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT).
    Region Skånes kompetensförsörjning i arbetet med digitalisering: En kvalitativ studie över regionens arbete med kompetensförsörjning i digitaliseringsarbetet2022Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [sv]

    Digitalisering är ett begrepp som flitigt nämns inom diskussioner kring effektiviseringsmöjligheter. För att kunna digitalisera krävs kompetens, vilket medför ett större behov av kompetens och därmed ett större fokus på kompetensförsörjning. Digitaliseringen är central när teknologi används för att förbättra och effektivisera verksamheter. I syfte att kunna utveckla och implementera digitala lösningar är det avgörande att ha tillräcklig kompetens och kunskap inom organisationen. Forskningsproblemet är av stor betydelse eftersom det berör utmaningarna som offentliga organisationer står inför när det gäller kompetensförsörjning i samband med digitaliseringen. För att lyckas med digitaliseringen krävs det att organisationerna har tillräcklig kompetens om digitala verktyg och teknologier. Utmaningarna som uppstår vid kompetensförsörjningen kan vara avgörande för framgången av digitaliseringsprojekt och initiativ. Med hjälp av en kvalitativ forskningsstrategi och semistrukturerade intervjuer har utmaningarna som regionen ställs inför i digitaliseringsarbetet studerats, främst i förhållande till kompetensförsörjning. I det insamlade datamaterialet kunde man notera tre framstående utmaningar som regionen upplevde: brist på spetskompetens, attityder gentemot förändringar inom organisationen samt utmaningar vid genomförande av projekt. Studien visar även att viljan att digitalisera är hög men att de ännu inte lyckats maximera värdet som finns i att digitalisera analoga processer - därmed finns utrymmen för förbättringar i regionen vad gäller maximering av digitaliseringens potential. 

    Fulltekst (pdf)
    fulltext
  • 40.
    Dludla, Gcina
    et al.
    CSIR NGEI, POB 395, ZA-0001 Pretoria, South Africa..
    Mekuria, Fisseha
    CSIR NGEI, POB 395, ZA-0001 Pretoria, South Africa..
    Dynamic Spectrum Sharing for Future Wireless Networks: Regulators Perspective2021Inngår i: 2021 IST-Africa Conference (IST-Africa), Institute of Electrical and Electronics Engineers (IEEE), 2021Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Radio Frequency spectrum is the superhighway enabling a myriad of wireless ICT services and applications. Spectrum scarcity and expensive licensing cost has resulted in research and innovations by the CSIR, wireless network providers and telecom regulators, which helped to develop techniques to dynamically share & manage spectrum, thereby enabling efficient spectrum utilization. Spectrum management based on spectrum sharing techniques such as LSA & SAS are being considered by spectrum regulators, aiming at efficient use of spectrum as a scarce natural resource, while ensuring non-interference & fairness between different radio spectrum users and wireless services. This paper recommends the improvement of spectrum management by regulatory authorities using recent research and technologies developed for spectrum sharing and application of new spectrum licensing frameworks. The paper presents spectrum licensing & management approaches and focuses on the enabling role smart spectrum sharing can play in spectrum efficient and affordable broadband wireless networks. A comparative analysis of advantages and disadvantages of a regulator licensing spectrum, as compared to allowing mobile operators to sub-license allocated spectrum is also discussed in the paper.

  • 41.
    Dong, Yuji
    et al.
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT).
    Wan, Kaiyu
    Department of Computer Science and Software Engineering, Xi'an Jiaotong Liverpool University, Suzhou 215123, China.
    Yue, Yong
    Department of Computer Science and Software Engineering, Xi'an Jiaotong Liverpool University, Suzhou 215123, China.
    A Semantic-Based Belief Network Construction Approach in IoT2020Inngår i: Sensors, E-ISSN 1424-8220, Vol. 20, nr 20, artikkel-id E5747Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Uncertainty is intrinsic in most of the complex systems, especially when the systems have to interact with the physical environment; therefore, handling uncertainty is critical in the Internet of Things (IoT). In this paper, we propose a semantic-based approach to build the belief network in IoT systems to handle the uncertainties. Semantics is the functionality description of any system component. Semantic Match mechanisms can construct the appropriate structures to compare the consistency between different sources of data based on the same functionality. In the approach, we define the belief property of every system component and develop the related algorithms to update the belief value. Furthermore, the related mechanisms and algorithms for data fusion and fault detection based on the belief property are described to explain how the approach works in the IoT systems. Several simulation experiments are used to evaluate the proposed approach, and the results indicate that the approach can work as expected. More accurate data are fused from the inaccurate devices and the fault in one node is automatically detected.

    Fulltekst (pdf)
    fulltext
  • 42.
    Dzhusupova, Rimma
    et al.
    McDermott, Dept Elect & Instrumentat Control & Safety Syst, The Hague, Netherlands..
    Banotra, Richa
    McDermott, Dept Instrumentat Control & Safety Syst, The Hague, Netherlands..
    Bosch, Jan
    Chalmers Univ Technol, Dept Comp Sci & Engn, Gothenburg, Sweden..
    Olsson, Helena Holmström
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT).
    Pattern Recognition Method for Detecting Engineering Errors on Technical Drawings2022Inngår i: 2022 IEEE World AI IoT Congress (AIIoT) / [ed] Paul, R, IEEE , 2022, s. 642-648Konferansepaper (Fagfellevurdert)
  • 43.
    Ekedahl, Ulrik
    et al.
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT). Malmö universitet, Internet of Things and People (IOTAP).
    Mihailescu, Radu-Casian
    Malmö universitet, Internet of Things and People (IOTAP). Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT).
    Ma, Zhizhong
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT). Malmö universitet, Internet of Things and People (IOTAP).
    Lessons Learned from Adapting "Things" to IoT Platforms in Research and Teaching2018Inngår i: SAC '18: Proceedings of the 33rd Annual ACM Symposium on Applied Computing, ACM Digital Library, 2018, s. 1457-1460Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This study presents lessons learned based on practical experiences of connecting devices to internet-of-things platforms in the context of research and academic coursework. The experiences are gathered from six research projects, one undergraduate course, and a few undergraduate theses over a three-year period. The lessons learned include: the trade-off of rapid prototyping over security is very common, example source code is not up to production standards, adherence to standards speeds development, debugging support for IoT systems is lacking, open source licenses varies, poor platform interoperability, and the array of service fees among platform providers obstruct cost comparisons.

  • 44.
    Eklund, André
    et al.
    Malmö universitet, Fakulteten för teknik och samhälle (TS).
    Helin, Sebastian
    Malmö universitet, Fakulteten för teknik och samhälle (TS).
    Evaluating the use of Brush and Tooltip for Time Series visualizations: A comparative study2023Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    This study uses a combination of user testing and analysis to evaluate the impact of brush and tooltip on the comprehension of time series visualizations. Employing a sequential mixed-methods approach, with qualitative data from semi-structured interviews used to inform the design of a visualization tool, followed by a quantitative user study to validate it. Sixteen (16) participants from various fields of study, predominantly computer science, participated in the study. A MANOVA test was conducted with results indicating a significant statistical difference between the groups. Results deriving from the study show that the use of brush and tooltip increases user accuracy on detecting outliers, as for perception of trends and patterns. The study’s context was limited to desktop usage, and all participants were treated as a homogenous group, presenting potential limitations in applying these findings to other devices or more diverse user groups. The results provide information about improving time series data visualizations for facilitating more efficient and effective understanding, which can be relevant specifically to data analysts and academic researchers.

    Fulltekst (pdf)
    fulltext
  • 45. Eliasson, Bo
    et al.
    Nilsson, Bengt J.
    Malmö högskola, Teknik och samhälle (TS).
    New Technology for Safe Critical Applications in Real Time2001Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    Several techniques are available for constraint satisfaction problems. Most of them lack real time capability and distributed computational properties. Configuration of complex systems has today become a competitive edge, e.g. within e-business. The other side of the same coin can be used for diagnosis and simulation of safe critical applications. This paper gives a scientific background and comparison of methods for constraint satisfaction problems implemented in real time environment. Especially, the technique and its features of the array-based logic will be illustrated by three examples. The examples are: 1.Modelling and simulation of system wide protection applications of power systems 2.Modelling, simulation and implementation of safe critical switching in power systems 3.Modelling, simulation and implementation of safe critical systems of automatic train control Array-based logic is a novel technology, which is founded on a geometrical representation of logic in terms of nested data arrays. In this representation, logical inferences are executed on finite domain systems by a few standardised array operations. In computational practice, array-based logic makes it possible to solve large-scale constraint problems with combinations very efficiently. The major advantages of the technology are completeness, compactness, and speed of simulation (real-time capability), all of which derive from intrinsic properties of the underlying geometrical model. A system in array-based logic is considered analogously to electrical networks and is thus described by the constraints of the isolated elements as well as the constraints of the interconnected elements (the system topology). All system constraints are eliminated in accordance with the methods known from electrical network theory and other engineering disciplines rooted in classical physics. The configuration space is represented explicitly in terms of nested data arrays and the system can therefore be simulated in real-time by co-ordinate indexing on these arrays. This data driven approach makes it suitable for parallel processing, which is an important quality for distributed systems.

    Fulltekst (pdf)
    FULLTEXT01
  • 46.
    Engström, Jimmy
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT). Sony Europe B.V., Lund, Sweden.
    Improving Indoor Positioning With Adaptive Noise Modeling2020Inngår i: IEEE Access, E-ISSN 2169-3536, Vol. 8, s. 227213-227221Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Indoor positioning is important for applications within Internet of Things, such as equipment tracking and indoor maps. Inexpensive Bluetooth-beacons have become common for such applications, where the distance is estimated using the Received Signal Strength. Large installations require substantial efforts, either in determining the exact location of all beacons to facilitate lateration, or collecting signal strength data from a grid over all locations to facilitate fingerprinting. To reduce this initial setup cost, one may infer the positions using Simultaneous Location and Mapping. In this paper, we use a mobile phone equipped with an Inertial Measurement Unit, a Bluetooth receiver, and an Unscented Kalman Filter to infer beacon positions. Further, we apply adaptive noise modeling in the filter based on the estimated distance of the beacons, in contrast to using a fixed noise estimate which is the common approach. This gives us more granular control of how much impact each signal strength reading has on the position estimates. The adaptive model decreases the beacon positioning errors by 27% and the user positioning errors by 21%. The positioning accuracy is 0.3 m better compared to using known beacon positions with fixed noise, while the effort to setup and maintain the position of each beacon is also substantially reduced. Therefore, adaptive noise modeling of Received Signal Strength is a significant improvement over static noise modeling for indoor positioning.

    Fulltekst (pdf)
    fulltext
  • 47.
    Engström, Jimmy
    et al.
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT). Malmö universitet, Internet of Things and People (IOTAP). Sony Europe BV, S-22362 Lund, Sweden..
    Jevinger, Åse
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT). Malmö universitet, Internet of Things and People (IOTAP).
    Olsson, Carl Magnus
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT). Malmö universitet, Internet of Things and People (IOTAP).
    Persson, Jan A.
    Malmö universitet, Internet of Things and People (IOTAP). Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT).
    Some Design Considerations in Passive Indoor Positioning Systems2023Inngår i: Sensors, E-ISSN 1424-8220, Vol. 23, nr 12, artikkel-id 5684Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    User location is becoming an increasingly common and important feature for a wide range of services. Smartphone owners increasingly use location-based services, as service providers add context-enhanced functionality such as car-driving routes, COVID-19 tracking, crowdedness indicators, and suggestions for nearby points of interest. However, positioning a user indoors is still problematic due to the fading of the radio signal caused by multipath and shadowing, where both have complex dependencies on the indoor environment. Location fingerprinting is a common positioning method where Radio Signal Strength (RSS) measurements are compared to a reference database of previously stored RSS values. Due to the size of the reference databases, these are often stored in the cloud. However, server-side positioning computations make preserving the user's privacy problematic. Given the assumption that a user does not want to communicate his/her location, we pose the question of whether a passive system with client-side computations can substitute fingerprinting-based systems, which commonly use active communication with a server. We compared two passive indoor location systems based on multilateration and sensor fusion using an Unscented Kalman Filter (UKF) with fingerprinting and show how these may provide accurate indoor positioning without compromising the user's privacy in a busy office environment.

    Fulltekst (pdf)
    fulltext
  • 48.
    Erceg, Mirjana
    et al.
    Aalborg Univ, Copenhagen, Denmark..
    Palamas, Georgios
    Malmö universitet, Fakulteten för teknik och samhälle (TS), Institutionen för datavetenskap och medieteknik (DVMT).
    Towards Harmonious Coexistence: A Bioacoustic-Driven Animal-Computer Interaction System for Preventing Ship Collisions with North Atlantic Right Whales2023Inngår i: TENTH INTERNATIONAL CONFERENCE ON ANIMAL-COMPUTER INTERACTION, ACI 2023, ASSOC COMPUTING MACHINERY , 2023, s. 1-10Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The North Atlantic Right Whale (NARW) population is currently teetering on the brink of extinction, with a mere approximate count of 350 individuals remaining. These animals have been protected under the Endangered Species Act since 1970. Today, the survival of right whales is imperiled primarily due to vessel collisions, net entanglements, and habitat degradation. This paper presents a novel system of animal-computer interaction founded on the identification of bioacoustic signatures. Initially, NARWs' vocalizations were transformed into spectrograms, which were subsequently inputted into a Convolutional Neural Network (CNN). To enhance robustness against environmental noise, techniques such as time warping, frequency masking, and time masking were employed. The outcomes of our study indicate that the proposed system holds potential for establishing a closed-loop interaction framework between vessels and NARWs. This framework could enable vessels to adapt their speed or avoid routes frequented by NARWs. Furthermore, this article discusses the potential benefits of employing networked sensors, such as Internet of Things (IoT) devices, to augment NARW monitoring and data collection efforts.

    Fulltekst (pdf)
    fulltext
  • 49.
    Eriksson, Hedda
    et al.
    Malmö universitet, Fakulteten för teknik och samhälle (TS).
    Ramkull, Malin
    Malmö universitet, Fakulteten för teknik och samhälle (TS).
    An Algorithm for Characterising Gait during a Timed Up and Go test using Sensorised Mats2024Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    Timed up and go (TUG) test is a widely recognised and standardised mobility test to measure basic mobility and balance capabilities. Although its reliability is proven, the acquisition of ac- curate and objective information requires technical equipment. To address this need for accuracy and objectivity, our research examines the utilisation of non-wearable sensors for gait analysis during a TUG test. Collaborating with the Italian National Research Council (CNR) in Pisa, the study illustrates our attempt to develop software specifically designed for conducting the TUG test in conjunction with hardware from SensingTex’s Sensing Mat portfolio. By doing this, the re- search also aims to fill the gap in TUG-specific software targeting sensorised mats. The developed software characterise the gait during the TUG test by identifying and examining the following parameters: TUG-time, Sit-to-Stand, Mid-Turning, and End-Turning-Stand-to-Sit. Additionally, meaningful parameters for overall gait assessment have been selected: walking speed and stride length. Two experimental iterations were conducted to assess the reliability of the developed soft- ware. Both iterations involved two different groups of six healthy participants (41.58±13.32 yrs; 6 females, 6 males) performing various walking types. The results indicates that by translating these observations into quantitative data, our research has the potential to enhance the accuracy and objectivity of gait analysis, thereby improve clinical evaluations and advancing the field.

    Fulltekst (pdf)
    fulltext
  • 50.
    Forsberg, Jonas
    Malmö högskola, Teknik och samhälle (TS).
    Elteknik och elektriska installationer – introduktion2008Annet (Annet (populærvitenskap, debatt, mm))
    Abstract [sv]

    Två föreläsningspresentationer om elteknik och elektriska installationer. Informationen är på grundläggande nivå, riktad till personer utan förkunskaper i ämnet. Ingår i kursen Byggnaden, teknik och funktion, 15 hp, FF112A inom Fastighetsmäklarprogrammet, Malmö högskola. För att förstå hur en besiktning utförs och hur ett hus är uppbyggt behöver man som fastighetsmäklare kunskap bl. a om hur elektriska installationer är utformade. Översikt för den som vill sätta sig in i ämnet.

    Fulltekst (pdf)
    FULLTEXT01
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