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  • 1.
    Abbasi, Ziwar
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Bernebrand, Anna
    University of Borås, Faculty of Textiles, Engineering and Business.
    Projektering av elnätet för ett exploateringsområde2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The growing population in Sweden has led to the great need for new housing construction in the last decade. Consequently, new housing construction has increased substantially. To meet the capacity requirement, large investments are required from the electricity grid companies to connect the newly built residential areas and to enable the development of new infrastructure. The expansion opportunities that have arisen in the current municipality have led to the expansion of the grid for a new residential area. The purpose of the project is to find a rational solution to provide an exploitation area of 19 homes with electricity. To achieve a desirable result with the distribution planning, corporate guidelines and industry standards have been used. The projected distribution network is designed by a radial system, which means that power supply takes place only from one direction. The distribution network is made up of two different distribution systems: TN-S and TN-C. The distribution planning also includes network calculations carried out with both optimization software NetBas and manually. The parameters that have been calculated are voltage drops, short-circuit currents and short-circuiting time. The dimension of the distribution network, is calculated only through NetBas, it resulted in the installation of a network station, five cable cabinet, 0.9 kilometers low voltage cable and 0.13 kilometers high voltage cable. The project's total investment cost has approximately been estimated at 568 000 Swedish crowns.

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  • 2. Abtahi, F
    et al.
    Seoane, F
    University of Borås, School of Engineering.
    Lindecrantz, K
    University of Borås, School of Engineering.
    Electrical bioimpedance spectroscopy in time-variant systems: Is undersampling always a problem?2014In: Journal of Electrical Bioimpedance, E-ISSN 1891-5469, Vol. 5, no 1, p. 28-33Article in journal (Refereed)
    Abstract [en]

    During the last decades, Electrical Bioimpedance Spectroscopy (EBIS) has been applied mainly by using the frequency-sweep technique, across a range of many different applications. Traditionally, the tissue under study is considered to be time-invariant and dynamic changes of tissue activity are ignored by treating the changes as a noise source. A new trend in EBIS is simultaneous electrical stimulation with several frequencies, through the application of a multi-sine, rectangular or other waveform. This method can provide measurements fast enough to sample dynamic changes of different tissues, such as cardiac muscle. This high sampling rate comes at a price of reduction in SNR and the increase in complexity of devices. Although the frequency-sweep technique is often inadequate for monitoring the dynamic changes in a variant system, it can be used successfully in applications focused on the time-invariant or slowly-variant part of a system. However, in order to successfully use frequency-sweep EBIS for monitoring time-variant systems, it is paramount to consider the effects of aliasing and especially the folding of higher frequencies, on the desired frequency e.g. DC level. This paper discusses sub-Nyquist sampling of thoracic EBIS measurements and its application in the case of monitoring pulmonary oedema. It is concluded that by considering aliasing, and with proper implementation of smoothing filters, as well as by using random sampling, frequency-sweep EBIS can be used for assessing time-invariant or slowly-variant properties of time-variant biological systems, even in the presence of aliasing. In general, undersampling is not always a problem, but does always require proper consideration.

  • 3.
    Abtahi, Farhad
    et al.
    Karolinska Institutet.
    Anund, Anna
    Fors, Carina
    Seoane, Fernando
    University of Borås, Faculty of Textiles, Engineering and Business. University of Borås, Faculty of Caring Science, Work Life and Social Welfare. Karolinska Institutet.
    Lindecrantz, Kaj
    University of Borås, Faculty of Textiles, Engineering and Business. Karolinska Institutet.
    Association of Drivers’ sleepiness with heart rate variability. A Pilot Study with Drivers on Real Road2017Conference paper (Other academic)
  • 4. Abtahi, Farhad
    et al.
    Aslamy, Benjamin
    Boujabir, I
    Seoane, Fernando
    University of Borås, School of Health Science.
    Lindecrantz, Kaj
    University of Borås, School of Engineering.
    An Affordable ECG and Respiration Monitoring System Based on Raspberry PI and ADAS1000: First Step towards Homecare Applications2014In: 16th Nordic-Baltic Conference on Biomedical Engineering / [ed] Mindedal H., Persson M., Springer International Publishing , 2014, p. 5-8Conference paper (Refereed)
    Abstract [en]

    Homecare is a potential solution for problems associated with an aging population. This may involve several physiological measurements, and hence a flexible but affordable measurement device is needed. In this work, we have designed an ADAS1000-based four-lead electrocardiogram (ECG) and respiration monitoring system. It has been implemented using Raspberry PI as a platform for homecare applications. ADuM chips based on iCoupler technology have been used to achieve electrical isolation as required by IEC 60601 and IEC 60950 for patient safety. The result proved the potential of Raspberry PI for the design of a compact, affordable, and medically safe measurement device. Further work involves developing a more flexible software for collecting measurements from different devices (measuring, e.g., blood pressure, weight, impedance spectroscopy, blood glucose) through Bluetooth or user input and integrating them into a cloud-based homecare system.

  • 5.
    Abtahi, Farhad
    et al.
    University of Borås, School of Health Science.
    Berndtsson, A
    University of Borås, School of Health Science.
    Abtahi, Shirin
    University of Borås, School of Health Science.
    Seoane, Fernando
    University of Borås, School of Health Science.
    Lindecrantz, Kaj
    KTH.
    Development and preliminary evaluation of an Android based heart rate variability biofeedback system2014Conference paper (Refereed)
    Abstract [en]

    The reduced Heart Rate Variability (HRV) is believed to be associated with several diseases such as congestive heart failure, diabetes and chronic kidney diseases (CKD). In these cases, HRV biofeedback may be a potential intervention method to increase HRV which in turn is beneficial to these patients. In this work, a real-time Android biofeedback application based on a Bluetooth enabled ECG and thoracic electrical bioimpedance (respiration) measurement device has been developed. The system performance and usability have been evaluated in a brief study with eight healthy volunteers. The result demonstrates real-time performance of system and positive effects of biofeedback training session by increased HRV and reduced heart rate. Further development of the application and training protocol is ongoing to investigate duration of training session to find an optimum length and interval of biofeedback sessions to use in potential interventions.

  • 6.
    Agrawal, Tarun Kumar
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Kumar, Vijay
    University of Borås, Faculty of Textiles, Engineering and Business.
    Pal, Rudrajeet
    University of Borås, Faculty of Textiles, Engineering and Business.
    Blockchain-Based Framework for Traceability – A Case Example of Nonwoven Supply Chain2019In: EDANA-Nonwovens Innovation Academy 2019, 2019Conference paper (Refereed)
    Abstract [en]

    Supply chain traceability has emerged as a prime requirement for multi-tier supply chains. It not only enables the supply chain visibility but also caters to the consumer requirements related to transparency, quality assurance, and production tracking. Nonwoven supply chain is one such example that particularly requires traceability implementation due to prevailing problems related to information asymmetry and complex supply chain networks. Conversely, it is challenging for supply chain partners to share all the competitive information in the unsecure environment. In this context, in line with Industry 4.0, this study investigates blockchain technology, which uses a shared and secured data infrastructure to keep track of information about assets and requires no central authority to function. It further proposes a blockchain-based traceability framework that explains supply chain partner interaction and network architecture at organizational level and smart contract and transaction validation rules at the operational level. In order to illustrate the application of the framework, the study presents an example of a nonwoven supply chain to track the nonwoven manufacturing and distribution processes. The proposed system can build a technology-based trust among the supply chain actors, where the distributed ledger would be used to store and authenticate of supply chain transactions.

  • 7.
    Alm, Håkan
    University of Borås, Faculty of Textiles, Engineering and Business.
    Supervising strategy for Phd Students2020Other (Refereed)
    Abstract [en]

    In this supervision strategy some important issues and challanges  are highlighted. The demands put on supervisors have gradually increased through and can lead to a difficult balance act by achieving results and marinating quality as time is a finite resource.

    Literature was reviewed and points out information that is already known and relevant to current research.

    This study is intended to present findings and conclusions regarding how to successfully coach and supervise PhD students to become ethical, yet confident and effective researchers and lecturers.

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  • 8.
    Axelberg, P.
    et al.
    University of Borås, School of Engineering.
    Gu, I.
    Bollen, M.
    Trace of Flicker Sources by using the Quantity of Flicker power.2008In: IEEE Transactions on Power Delivery, ISSN 0885-8977, E-ISSN 1937-4208, Vol. 23, no 1, p. 465-471Article in journal (Refereed)
    Abstract [en]

    Industries that produce flicker are often placed close to each other and connected to the same power grid system. This implies that the measured flicker level at the point of common coupling (PCC) is a result of contribution from a number of different flicker sources. In a mitigation process it is essential to know which one of the flicker sources is the dominant one. We propose a method to determine the flicker propagations and trace the flicker sources by using flicker power measurements. Flicker power is considered as a quantity containing both sign and magnitude. The sign determines if a flicker source is placed downstream or upstream with respect to a given monitoring point and the magnitude is used to determine the propagation of flicker power throughout the power network and to trace the dominant flicker source. This paper covers the theoretical background of flicker power and describes a novel method for calculation of flicker power that can be implemented in a power network analyzer. Also conducted simulations and a field test based on the proposed method will be described in the paper.

  • 9.
    Axelberg, Peter
    University of Borås, School of Engineering.
    On Tracing Flicker Sources and Classification of Voltage Disturbances2007Doctoral thesis, monograph (Other academic)
    Abstract [en]

    Developments in measurement technology, communication and data storage have resulted in measurement systems that produce large amount of data. Together with the long existing need for characterizing the performance of the power system this has resulted in demand for automatic and efficient information-extraction methods. The objective of the research work presented in this thesis was therefore to develop new robust methods that extract additional information from voltage and current measurements in power systems. This work has contributed to two specific areas of interest. The first part of the work has been the development of a measurement method that gives information how voltage flicker propagates (with respect to a monitoring point) and how to trace a flicker source. As part of this work the quantity of flicker power has been defined and integrated in a perceptionally relevant measurement method. The method has been validated by theoretical analysis, by simulations, and by two field tests (at low-voltage and at 130-kV level) with results that matched the theory. The conclusion of this part of the work is that flicker power can be used for efficient tracing of a flicker source and to determine how flicker propagates. The second part of the work has been the development of a voltage disturbance classification system based on the statistical learning theory-based Support Vector Machine method. The classification system shows always high classification accuracy when training data and test data originate from the same source. High classification accuracy is also obtained when training data originate from one power network and test data from another. The classification system shows, however, lower performance when training data is synthetic and test data originate from real power networks. It was concluded that it is possible to develop a classification system based on the Support Vector Machine method with “global settings” that can be used at any location without the need to retrain. The conclusion is that the proposed classification system works well and shows sufficiently high classification accuracy when trained on data that originate from real disturbances. However, more research activities are needed in order to generate synthetic data that have statistical characteristics close enough to real disturbances to replace actual recordings as training data.

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  • 10.
    Axelberg, Peter
    et al.
    University of Borås, School of Engineering.
    Carlsson, Jonny
    Unipower AB.
    Measuring method for deciding direction to a flickering source2003Patent (Other (popular science, discussion, etc.))
    Abstract [en]

    Method and arrangement for deciding the direction to a flickering source in relation to a measurement point in an electrical network with alternating current with a network frequency with low-frequency amplitude variations from the flickering source. The method includes the steps: recording an amplitude-modulated current signal having signals that originate from the network frequency and the low-frequency amplitude variations in the current signal; recording an amplitude-modulated voltage signal having signals that originate from the network frequency and the low-frequency amplitude variations in the voltage signal; creating a flicker power with a sign value by multiplication of the low-frequency amplitude variations in the current signal and the low-frequency amplitude variations in the voltage signal, and analyzing the sign value, with the sign value indicating in which direction the flickering source is to be found in relation to the measurement point.

  • 11.
    Axelberg, Peter
    et al.
    University of Borås, School of Engineering.
    Carlsson, Jonny
    Unipower AB.
    Mätmetod för bestämning av riktning till flimmerstörkälla2002Patent (Other (popular science, discussion, etc.))
  • 12.
    Axelberg, Peter G. V.
    et al.
    University of Borås, School of Engineering.
    Bollen, Math H. J.
    Gu, Irene Y. H.
    A Measurement Method for Determining the Direction of Propagation of Flicker and for Tracing a Flicker Source.2007Conference paper (Refereed)
  • 13.
    Axelberg, Peter G. V.
    et al.
    University of Borås, School of Engineering.
    Bollen, Math H. J.
    Gu, Irene Y. H.
    Automatic classification of voltage events using the support Vector2007Conference paper (Refereed)
  • 14.
    Axelberg, P.G.V.
    et al.
    University of Borås, School of Engineering.
    Gu, Irene Yu-Hua
    Bollen, M.H.J.
    Support Vector Machine for Classification of Voltage Disturbances2007In: IEEE Transactions on Power Delivery, ISSN 0885-8977, E-ISSN 1937-4208, Vol. 22, no 3, p. 1297-1303Article in journal (Refereed)
    Abstract [en]

    The support vector machine (SVM) is a powerful method for statistical classification of data used in a number of different applications. However, the usefulness of the method in a commercial available system is very much dependent on whether the SVM classifier can be pretrained from a factory since it is not realistic that the SVM classifier must be trained by the customers themselves before it can be used. This paper proposes a novel SVM classification system for voltage disturbances. The performance of the proposed SVM classifier is investigated when the voltage disturbance data used for training and testing originated from different sources. The data used in the experiments were obtained from both real disturbances recorded in two different power networks and from synthetic data. The experimental results shown high accuracy in classification with training data from one power network and unseen testing data from another. High accuracy was also achieved when the SVM classifier was trained on data from a real power network and test data originated from synthetic data. A lower accuracy resulted when the SVM classifier was trained on synthetic data and test data originated from the power network.

  • 15. Bollen, M.
    et al.
    Gu, I.
    Axelberg, P.
    University of Borås, School of Engineering.
    Styvaktakis, E.
    Classification of Underlying Causes of Power Quality Disturbances: Deterministic versus Statistical Methods.2007In: EURASIP Journal on Advances in Signal Processing, ISSN 1687-6172, E-ISSN 1687-6180, Vol. 2007, no 79747, p. 17-Article in journal (Refereed)
    Abstract [en]

    This paper presents the two main types of classification methods for power quality disturbances based on underlying causes: deterministic classification, giving an expert system as an example, and statistical classification, with support vector machines as an example. An expert system is suitable when one has limited amount of data and sufficient power system expert knowledge, however its application requires a set of threshold values. Statistical methods are suitable when large amount of data is available for training. Two important issues to guarantee the effectiveness of a classifier, data segmentation and feature extraction, are discussed. Segmentation of a sequence of data recording is pre-processing to partition the data into segments each representing a duration containing either an event or transition between two events. Extraction of features is applied to each segment individually. Some useful features and their effectiveness are then discussed. Some experimental results are included for demonstrating the effectiveness of both systems. Finally, conclusions are given together with the discussion of some future research directions.

  • 16.
    Buendia, Ruben
    et al.
    University of Borås, School of Engineering.
    Gil-Pita, Roberto
    Seoane, Fernando
    University of Borås, School of Engineering.
    Cole Parameter Estimation from the Modulus of the Electrical Bioimpeadance for Assessment of Body Composition. A Full Spectroscopy Approach2011In: Journal of Electrical Bioimpedance, E-ISSN 1891-5469, Vol. 2, p. 72-78Article in journal (Refereed)
    Abstract [en]

    Activities around applications of Electrical Bioimpedance Spectroscopy (EBIS) have proliferated in the past decade significantly. Most of these activities have been focused in the analysis of the EBIS measurements, which eventually might enable novel applications. In Body Composition Assessment (BCA), the most common analysis approach currently used in EBIS is based on the Cole function, which most often requires curve fitting. One of the most implemented approaches for obtaining the Cole parameters is performed in the impedance plane through the geometrical properties that the Cole function exhibit in such domain as depressed semi-circle. To fit the measured impedance data to a semi-circle in the impedance plane, obtaining the Cole parameters in an indirect and sequential manner has several drawbacks. Applying a Non-Linear Least Square (NLLS) iterative fitting on the spectroscopy measurement, obtains the Cole parameters considering the frequency information contained in the measurement. In this work, from experimental total right side EBIS measurements, the BCA parameters have been obtained to assess the amount and distribution of whole body fluids. The values for the BCA parameters have been obtained using values for the Cole parameters estimated with both approaches: circular fitting on the impedance plane and NLLS impedance-only fitting. The comparison of the values obtained for the BCA parameters with both methods confirms that the NLLS impedance-only is an effective alternative as Cole parameter estimation method in BCA from EBIS measurements. Using the modulus of the Cole function as the model for the fitting would eliminate the need for performing phase detection in the acquisition process, simplifying the hardware specifications of the measurement instrumentation when implementing a bioimpedance spectrometer.

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  • 17. Buendia, Ruben
    et al.
    Seoane, Fernando
    University of Borås, School of Engineering.
    Bosaeus, Ingvar
    Gil-Pita, Roberto
    Johannsson, G
    Ellegård, Lars
    Lindecrantz, Kaj
    University of Borås, School of Engineering.
    Robustness study of the different immittance spectra and frequency ranges in bioimpedance spectroscopy analysis for assessment of total body composition2014In: Physiological Measurement, ISSN 0967-3334, E-ISSN 1361-6579, ISSN 0967-3334, Vol. 35, no 7, p. 1373-Article in journal (Refereed)
    Abstract [en]

    The estimation of body fluids is a useful and common practice for assessment of disease status and therapy outcomes. Electrical bioimpedance spectroscopy (EBIS) methods are noninvasive, inexpensive and efficient alternatives for determination of body fluids. One of the main source of errors in EBIS measurements in the estimation of body fluids is capacitive coupling. In this paper an analysis of capacitive coupling in EBIS measurements was performed and the robustness of the different immittance spectra against it tested. On simulations the conductance (G) spectrum presented the smallest overall error, among all immittance spectra, in the estimation of the impedance parameters used to estimate body fluids. Afterwards the frequency range of 10–500 kHz showed to be the most robust band of the G spectrum. The accuracy of body fluid estimations from the resulting parameters that utilized G spectrum and parameters provided by the measuring device were tested on EBIS clinical measurements from growth hormone replacement therapy patients against estimations performed with dilution methods. Regarding extracellular fluid, the correlation between each EBIS method and dilution was 0.93 with limits of agreement of 1.06 ± 2.95 l for the device, 1.10 ± 2.94 l for G [10–500 kHz] and 1.04 ± 2.94 l for G [5–1000 kHz]. Regarding intracellular fluid, the correlation between dilution and the device was 0.91, same as for G [10–500 kHz] and 0.92 for G [5–1000 kHz]. Limits of agreement were 0.12 ± 4.46 l for the device, 0.09 ± 4.45 for G [10–500 kHz] and 0.04 ± 4.58 for G [5–1000 kHz]. Such close results between the EBIS methods validate the proposed approach of using G spectrum for initial Cole characterization and posterior clinical estimation of body fluids status.

  • 18. Buendia, Ruben
    et al.
    Seoane, Fernando
    University of Borås, School of Engineering.
    Gil-Pita, Roberto
    A Novel Approach for Removing the Hook Effect Artefact from Electrical Bioimpedance Spectroscopy Measurements2009In: Journal of Physics: Conference Series, Institute of Physics Publishing Ltd. , 2009Conference paper (Refereed)
    Abstract [en]

    Very often in Electrical Bioimpedance (EBI) spectroscopy measurements the presence of stray capacitances creates a measurement artefact commonly known as Hook Effect. Such an artefact creates a hook-alike deviation of the EBI data noticeable when representing the measurement on the impedance plane. Such Hook Effect is noticeable at high frequencies but it also causes a data deviation at lower measurement frequencies. In order to perform any accurate analysis of the EBI spectroscopy data, the influence of the Hook Effect must be removed. An established method to compensate the hook effect is the well known Td compensation, which consist on multiplying the obtained spectrum, Zmeas() by a complex exponential in the form of exp[jTd]. Such a method cannot correct entirely the Hook Effect since the hook-alike deviation occurs a broad frequency range in both magnitude and phase of the measured impedance, and by using a real value for Td. First, a real value only modifies the phase of the measured impedance and second, it can only correct the Hook Effect at a single frequency. In addition, the process to select a value for Td by an iterative process with the aim to obtain the best Cole fitting lacks solid scientific grounds. In this work the Td compensation method is revisited and a modified approach for correcting the Hook Effect that includes a novel method for selecting the correcting values is proposed. The initial validation results confirm that the proposed method entirely corrects the Hook Effect at all frequencies.

  • 19.
    Buendia, Ruben
    et al.
    Chalmers University of Technology.
    Seoane, Fernando
    University of Borås, Faculty of Caring Science, Work Life and Social Welfare. KTH-School of Technology and Health.
    Lindecrantz, Kaj
    KTH-School of Technology and Health.
    Bosaeus, Ingvar
    University of Gothenburg.
    Gil-Pita, Roberto
    Universidad de Alcala.
    Johannsson, Gudmundur
    University of Gothenburg.
    Ellegård, Lars
    University of Gothenburg.
    Ward, Leigh
    University of Queensland.
    Estimation of body fluids with bioimpedance spectroscopy: state of the art methods and proposal of novel methods2015In: Physiological Measurement, ISSN 0967-3334, E-ISSN 1361-6579, Vol. 36, no 10Article in journal (Refereed)
  • 20.
    Chen, Wei
    et al.
    Fudan University.
    Augusto, Juan CarlosMiddlesex University.Seoane, FernandoUniversity of Borås, Faculty of Caring Science, Work Life and Social Welfare. KTH-School of Technology and Health.Ledhocki, FedorSlovak University of Technology.Arends, JohanTechnical University of Technology.Ungureanu, ConstantinHobo Heeze.Wichert, ReinerFraunhofer IGD.
    Recent Advances in Ambient Assisted Living: Bridging Assistive Technologies, e-Health and Personalized Health Care2015Collection (editor) (Refereed)
  • 21.
    Cheng, Jingyuan
    et al.
    German Research Center for Artificial Intelligence (DFKI).
    Zhou, Bo
    German Research Center for Artificial Intelligence (DFKI).
    Lukowicz, Paul
    German Research Center for Artificial Intelligence (DFKI).
    Seoane, Fernando
    University of Borås, Faculty of Textiles, Engineering and Business. University of Borås, Faculty of Caring Science, Work Life and Social Welfare. Karolinska Institutet.
    Varga, Matija
    ETH Zurich.
    Mehmann, Andreas
    ETH Zurich.
    Chabrecek, Peter
    SEFAR AG.
    Gaschler, Werner
    SEFAR AG.
    Goenner, Karl
    ITV Denkendorf.
    Horter, Hansjürgen
    ITV Denkendorf.
    Schneegass, Stefan
    Hassib, Mariam
    University of Stuttgart.
    Schmidt, Albrecht
    University of Stuttgart.
    Freund, Martin
    University of Passau.
    Zhang, Rui
    University of Passau.
    Amft, Oliver
    University of Passau.
    Textile Building Blocks:Toward Simple, Modularized, and Standardized Smart Textile2017In: Smart Textiles: Fundamentals, Design, and Interaction, Springer, Cham , 2017, p. 303-331Chapter in book (Refereed)
    Abstract [en]

    Textiles are pervasive in our life, covering human body and objects, as well as serving in industrial applications. In its everyday use of individuals, smart textile becomes a promising medium for monitoring, information retrieval, and interaction. While there are many applications in sport, health care, and industry, the state-of-the-art smart textile is still found only in niche markets. To gain mass-market capabilities, we see the necessity of generalizing and modularizing smart textile production and application development, which on the one end lowers the production cost and on the other end enables easy deployment. In this chapter, we demonstrate our initial effort in modularization. By devising types of universal sensing fabrics for conductive and non-conductive patches, smart textile construction from basic, reusable components can be made. Using the fabric blocks, we present four types of sensing modalities, including resistive pressure, capacitive, bioimpedance, and biopotential. In addition, we present a multi-channel textile–electronics interface and various applications built on the top of the basic building blocks by ‘cut and sew’ principle.

  • 22.
    Euler, Luisa
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Guo, Li
    University of Borås, Faculty of Textiles, Engineering and Business.
    Persson, Nils-Krister
    University of Borås, Faculty of Textiles, Engineering and Business. Smart Textiles Technology Lab, Smart Textiles, University of Borås, SE-501 90 Borås, Sweden.
    Textile electrodes: Influence of knitting construction and pressure on the contact impedance2021In: Sensors, E-ISSN 1424-8220, Vol. 21, no 5, p. 1-23, article id 1578Article in journal (Refereed)
    Abstract [en]

    Textile electrodes, also called textrodes, for biosignal monitoring as well as electrostimulation are central for the emerging research field of smart textiles. However, so far, only the general suitability of textrodes for those areas was investigated, while the influencing parameters on the contact impedance related to the electrode construction and external factors remain rather un-known. Therefore, in this work, six different knitted electrodes, applied both wet and dry, were compared regarding the influence of specific knitting construction parameters on the three-electrode contact impedance measured on a human forearm. Additionally, the influence of applying pressure was investigated in a two-electrode setup using a water-based agar dummy. Further, simulation of an equivalent circuit was used for quantitative evaluation. Indications were found that the preferred electrode construction to achieve the lowest contact impedance includes a square shaped electrode, knitted with a high yarn density and, in the case of dry electrodes, an uneven surface topography consisting of loops, while in wet condition a smooth surface is favorable. Wet electrodes are showing a greatly reduced contact impedance and are therefore to be preferred over dry ones; however, opportunities are seen for improving the electrode performance of dry electrodes by applying pressure to the system, thereby avoiding disadvantages of wet electrodes with fluid administration, drying-out of the electrolyte, and discomfort arising from a “wet feeling”. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

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  • 23.
    Fernandez-Llatas, Carlos
    et al.
    ITACA-SABIEN, Universitat Politecnica de Valencia, Spain.
    Ibanez-Sanchez, Gema
    ITACA-SABIEN, Universitat Politecnica de Valencia, Spain.
    Traver, Vicente
    ITACA-SABIEN, Universitat Politecnica de Valencia, Spain.
    Seoane, Fernando
    University of Borås, Faculty of Textiles, Engineering and Business. University of Borås, Faculty of Caring Science, Work Life and Social Welfare. Department of Biomedical Engineering, Karolinska University Hospital, Stockholm, Sweden; Department for Clinical Science, Intervention and Technology, Karolinska Institutet, Stockholm, Sweden.
    Empowering ergonomy in workplaces by individual behavior modeling using interactive process mining paradigm2018In: Intelligent Environments 2018 / [ed] Ioannis Chatzigiannakis, Yoshito Tobe, Paulo Novais, Oliver Amft, Amsterdam: IOS Press, 2018, p. 346-354Chapter in book (Refereed)
    Abstract [en]

    Work-related disorders account for a significant part of total healthcareexpenditure. Traditionally muscle-skeletal disorders were predominant as source ofwork absenteeism but in last years work activity-related disorders have increasedremarkably. Too little activity at work, sedentarism, or too much work activity leadsto stress. The individualized behavioural analysis of patients could support ergon-omy experts in the optimization of workplaces in a Healthier way. Process MiningTechnologies can offer a human understandable view of what is actually occurringin workplaces in an individualized way. In this paper, we present a proof of con-cept of how Process Mining technologies can be used for discovering the workerflow in order to support the ergonomy experts in the selection of more accurateinterventions for improving occupational health.

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  • 24.
    Ferreira Gonzalez, Javier
    University of Borås, School of Engineering.
    Textile-enabled Bioimpedance Instrumentation for Personalised Health Monitoring Applications2013Licentiate thesis, monograph (Other academic)
    Abstract [en]

    A growing number of factors, including the costs, technological advancements, an ageing population, and medical errors are leading industrialised countries to invest in research on alternative solutions to improving their health care systems and increasing patients’ life quality. Personal Health System (PHS) solutions envision the use of information and communication technologies that enable a paradigm shift from the traditional hospital-centred healthcare delivery model toward a preventive and person-centred approach. PHS offers the means to follow patient health using wearable, portable or implantable systems that offer ubiquitous, unobtrusive bio-data acquisition, allowing remote access to patient status and treatment monitoring.Electrical Bioimpedance (EBI) technology is a non-invasive, quick and relatively affordable technique that can be used for assessing and monitoring different health conditions, e.g., body composition assessments for nutrition. EBI technology combined with state-of-the-art advances in sensor and textile technology are fostering the implementation of wearable bioimpedance monitors that use functional garments for the implementation of personalised healthcare applications.This research studies the development of a portable EBI spectrometer that can use dry textile electrodes for the assessment of body composition for the purposes of clinical uses. The portable bioimpedance monitor has been developed using the latest advances in system-on-chip technology for bioimpedance spectroscopy instrumentation. The obtained portable spectrometer has been validated against commercial spectrometer that performs total body composition assessment using functional textrode garments.The development of a portable Bioimpedance spectrometer using functional garments and dry textile electrodes for body composition assessment has been shown to be a feasible option. The availability of such measurement systems bring closer the real implementation of personalised healthcare systems.

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  • 25.
    Ferreira Gonzalez, Javier
    et al.
    University of Borås, School of Engineering.
    Seoane, Fernando
    University of Borås, School of Engineering.
    Lindecrantz, Kaj
    University of Borås, School of Engineering.
    AD5933-Based Electrical Bioimpedance Spectrometer. Towards Textile-Enabled Applications.2011Conference paper (Refereed)
  • 26.
    Ferreira, Javier
    et al.
    University of Borås, School of Engineering.
    Seoane, Fernando
    University of Borås, School of Engineering.
    Ansede, Antonio
    Bragos, Ramon
    AD5933-based Spectrometer for Electrical Bioimpedance Applications2010In: Journal of Physics: Conference Series, Institute of Physics Publishing Ltd. , 2010Conference paper (Refereed)
    Abstract [en]

    To build an Electrical Bioimpedance (EBI) spectrometer using the Impedance Measurement System-On-Chip AD5933 together with a 4-Electrode Analog Front End (4E-AFE) has been proven practicable. Such small measurement devices can make possible several new applications of EBI technology, especially when combined with functional textiles, which can enable wearable applications for personal health and home monitoring. After the implementation and functional validation of the 4E-AFE-enabled spectrometer, the next natural step is to validate for which EBI applications the 4E-AFE-enabled system is suitable. To test the applicability of this novel spectrometer on several EBI applications, 2R1C equivalents models have been experimentally obtained and impedance spectroscopy measurements have been performed with the system under study and with the SFB7 EBI spectrometer manufactured by ImpediMed. The 2R1C circuit parameters have been estimated with the BioImp software from the spectra obtained with both EBI spectrometers and the estimated values have been compared with the original values used in each circuit model implementation. The obtained results indicated that the 4E-AFE-enabled system cannot beat the performance of the SFB7 in accuracy but it performs better in preciseness. In any case the overall performance indicates that the 4E-AFE-enabled system can perform spectroscopy measurements in the frequency range from 5 to 100 kHz.

  • 27.
    Gunnarsson, Emanuel
    Chalmers.
    Conductive Fabrics for Textile Electronic Interconnections and Capacitive Sensing - A Smart Textiles Perspective2017Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Smart textiles offer ways to integrate sensing and actuating abilities into textile structures found in garments, furniture and other applications such as filters, reinforcements, disposable products and others. A large part of the research being done on smart textiles concerns the possibilities for monitoring human health and wellbeing. In recent years, the research community has shown an increasing interest in measuring pressure using smart textiles. Observations in previous work on electrically conductive fabrics had shown that the conductivity in these fabrics was not always isotropic and the assumption was that the contact resistance between the conductive elements (often yarns) was the source of this anisotropy. The work done in connection to this thesis investigates two questions regarding smart textiles: first electrical interconnections and second electrical sensing. An algorithm and a device for measuring the contact resistance in woven samples were developed. Results from that work showed that the contact resistance of woven samples can be measured and that in the case of metallized yarns the contact resistance does not pose a problem for interconnection. For the sensing part two explanatory models for the capacitance of a functionalized spacer-fabric under compression were developed and tested on measured data. The results indicate that both models provide reasonable agreement with the data up to ca 50% compression.

  • 28.
    Guo, Li
    et al.
    University of Borås, Swedish School of Textiles.
    Berglin, Lena
    University of Borås, Swedish School of Textiles.
    Conductive coated force sensor in cargo transportation security system2010Conference paper (Other academic)
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  • 29.
    Guo, Li
    et al.
    University of Borås, Swedish School of Textiles.
    Berglin, Lena
    University of Borås, Swedish School of Textiles.
    Mattila, Heikki
    University of Borås, Swedish School of Textiles.
    Textile Strain Sensors Characterization- Sensitivity, Linearity, Stability and Hysteresis2010In: Nordic Textile Journal, no 2, p. 51-63Article in journal (Refereed)
    Abstract [en]

    In this paper 4 different textile based strain sensors for measuring different level of strains were presented. Sensor consist a conductive part formed by coating or weaving technique. Both elastic and inelastic textile substrates were selected to achieve the required stains in applications. Sensor configuration was characterized using a tensile tester and measuring the resistance parallel by microprocessor. A linear working range with transfer function of each sensor was found. Coated sensor gives a good stability, while woven sensor was relative less stable. Inelastic textile substrate reduces the hysteresis error caused by refraction and construction of materials. The sensitivities were between 2.5 to 9 vary with different sensors. This paper finished by a discussion of how to choose sensors with different applications, among which sensor function and processability are most important aspects to be considering.

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  • 30.
    Guo, Li
    et al.
    University of Borås, Swedish School of Textiles.
    Berglin, Lena
    University of Borås, Swedish School of Textiles.
    Mattila, Heikki
    University of Borås, Swedish School of Textiles.
    Mehrjerdi, Adib
    Skrifvars, Mikael
    University of Borås, School of Engineering.
    Disappearing Sensors. Textile Based Sensors for Monitoring Breathing2011Conference paper (Refereed)
    Abstract [en]

    Textile based sensors were developed and used for remote monitoring of breathing. The breathing is simulated by using a new cyclic tester device. In the simulated a cyclic force is applied along the length of the textile sensor. However due to the morphology of human body, in real situation the sensor is not only under stretching but also under a certain degree of bending. A prototype garment with the sensor situated on the chest area was made. The prototype was worn by 10 persons, and breathing was recorded as the persons were sitting still, walking and jogging. Deep breathing in the supine position and breathing with a method called athletic breathing were used to evaluate the sensor. A testing circuit and a Labview program were made for preliminary test. The sensor is wearable, washable and comfortable. Sensor construction is totally ‘disappearing’ and visualize as printed pattern onto the surface of garment.

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  • 31.
    Göbel, Hannes
    et al.
    University of Borås, School of Business and IT.
    Cronholm, Stefan
    University of Borås, School of Business and IT.
    Seigerroth, Ulf
    Towards an agile method for ITSM self-assessment: A Design Science Research Approach2013In: Proceedings of ICMLG 2013 The International Conference on Management, Leadership and Governance., ICMLG , 2013Conference paper (Refereed)
    Abstract [en]

    IT Service Management (ITSM) is an expensive field where small and medium sized enterprises (SMEs) need to become more efficient in their ITSM related work in order to cut costs and improve quality. The focus of this paper is to suggest a solution to the scarcity of process improvement methods dedicated to ITSM-processes in SMEs. The solution consists of an agile self-assessment method designed and evaluated in accordance with Design Science Research. The aim of the method is to support SMEs in their attempt to evaluate and improve their quality of ITSM processes. The findings show that the method creates opportunities for organizations to improve their ITSM processes. The method can be used to identify process gaps in comparison to standards for ITSM. It can also be used for benchmarking purposes within an organization as well as it can guide an organization’s improvement efforts. The method also depicts a standard that is easy for SMEs to understand and to use as guidance (with ITSM specific examples). Finally, the method enables SMEs to implement standards for ITSM in a resource-efficient way. Based on empirical evidence from applying the method the conclusion is that the method is useful for the intended target group and that the method agrees well with theories within the field.

  • 32.
    Hafid, Abdelakram
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business. Textile Materials Technology, Department of Textile Technology, Faculty of Textiles, Engineering and Business Swedish School of Textiles, University of Borås, 503 32 Borås, Sweden;School of Innovation, Design and Engineering, Mälardalen University, 722 20 Västerås, Sweden.
    Gunnarsson, Emanuel
    University of Borås, Faculty of Textiles, Engineering and Business. Textile Materials Technology, Department of Textile Technology, Faculty of Textiles, Engineering and Business Swedish School of Textiles, University of Borås, 503 32 Borås, Sweden.
    Ramos, Alberto
    University of Borås, Faculty of Textiles, Engineering and Business. Textile Materials Technology, Department of Textile Technology, Faculty of Textiles, Engineering and Business Swedish School of Textiles, University of Borås, 503 32 Borås, Sweden;UDIT—University of Design, Innovation and Technology, 28016 Madrid, Spain.
    Rödby, Kristian
    University of Borås, Faculty of Textiles, Engineering and Business. Textile Materials Technology, Department of Textile Technology, Faculty of Textiles, Engineering and Business Swedish School of Textiles, University of Borås, 503 32 Borås, Sweden.
    Abtahi, Farhad
    Institute for Clinical Science, Intervention and Technology, Karolinska Institutet, 141 83 Stockholm, Sweden;Department of Medical Care Technology, Karolinska University Hospital, 141 57 Huddinge, Sweden;Department of Clinical Physiology, Karolinska University Hospital, 141 57 Huddinge, Sweden.
    Bamidis, Panagiotis D.
    Lab of Medical Physics and Digital Innovation, School of Medicine, Aristotle University of Thessaloniki, 541 24 Thessaloniki, Greece.
    Billis, Antonis
    Lab of Medical Physics and Digital Innovation, School of Medicine, Aristotle University of Thessaloniki, 541 24 Thessaloniki, Greece.
    Papachristou, Panagiotis
    Academic Primary Health Care Center, Region Stockholm, 104 31 Stockholm, Sweden;Division of Family Medicine and Primary Care, Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, 141 83 Stockholm, Sweden.
    Seoane, Fernando
    University of Borås, Faculty of Textiles, Engineering and Business. University of Borås, Faculty of Caring Science, Work Life and Social Welfare. Textile Materials Technology, Department of Textile Technology, Faculty of Textiles, Engineering and Business Swedish School of Textiles, University of Borås, 503 32 Borås, Sweden;Institute for Clinical Science, Intervention and Technology, Karolinska Institutet, 141 83 Stockholm, Sweden;Department of Medical Care Technology, Karolinska University Hospital, 141 57 Huddinge, Sweden;Department of Clinical Physiology, Karolinska University Hospital, 141 57 Huddinge, Sweden.
    Sensorized T-Shirt with Intarsia-Knitted Conductive Textile Integrated Interconnections: Performance Assessment of Cardiac Measurements during Daily Living Activities2023In: Sensors, E-ISSN 1424-8220, Vol. 23, no 22, article id 9208Article in journal (Refereed)
    Abstract [en]

    The development of smart wearable solutions for monitoring daily life health status is increasingly popular, with chest straps and wristbands being predominant. This study introduces a novel sensorized T-shirt design with textile electrodes connected via a knitting technique to a Movesense device. We aimed to investigate the impact of stationary and movement actions on electrocardiography (ECG) and heart rate (HR) measurements using our sensorized T-shirt. Various activities of daily living (ADLs), including sitting, standing, walking, and mopping, were evaluated by comparing our T-shirt with a commercial chest strap. Our findings demonstrate measurement equivalence across ADLs, regardless of the sensing approach. By comparing ECG and HR measurements, we gained valuable insights into the influence of physical activity on sensorized T-shirt development for monitoring. Notably, the ECG signals exhibited remarkable similarity between our sensorized T-shirt and the chest strap, with closely aligned HR distributions during both stationary and movement actions. The average mean absolute percentage error was below 3%, affirming the agreement between the two solutions. These findings underscore the robustness and accuracy of our sensorized T-shirt in monitoring ECG and HR during diverse ADLs, emphasizing the significance of considering physical activity in cardiovascular monitoring research and the development of personal health applications. 

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  • 33.
    Hallnäs, Lars
    University of Borås, Swedish School of Textiles.
    Proceedings Ambience112011Conference paper (Refereed)
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  • 34. Hopkins, P
    et al.
    Outram, N
    Löfgren, N
    Ofeachor, E. C.
    Rosén, K. G.
    University of Borås, School of Engineering.
    A comparative study of fetal heart rate variability analysis techniques2006Conference paper (Refereed)
  • 35. Jiang, Wen jun
    et al.
    Wittek, Peter
    University of Borås, Swedish School of Library and Information Science.
    Zhao, Li
    Gao, Shi Chao
    Adaptive Thresholding with Inverted Triangular Area for Real-Time Detection of the Heart Rate from Photoplethysmogram Traces on a Smartphone2014Conference paper (Refereed)
    Abstract [en]

    Photoplethysmogram (PPG) signals acquired by smartphone cameras are weaker than those acquired by dedicated pulse oximeters. Furthermore, the signals have lower sampling rates, have notches in the waveform and are more severely affected by baseline drift, leading to specific morphological characteristics. This paper introduces a new feature, the inverted triangular area, to address these specific characteristics. The new feature enables real-time adaptive waveform detection using an algorithm of linear time complexity. It can also recognize notches in the waveform and it is inherently robust to baseline drift. An implementation of the algorithm on Android is available for free download. We collected data from 24 volunteers and compared our algorithm in peak detection with two competing algorithms designed for PPG signals, Incremental-Merge Segmentation (IMS) and Adaptive Thresholding (ADT). A sensitivity of 98.0 % and a positive predictive value of 98.8 % were obtained, which were 7.7 % higher than the IMS algorithm in sensitivity, and 8.3 % higher than the ADT algorithm in positive predictive value. The experimental results confirmed the applicability of the proposed method.

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  • 36.
    Jiong, Sun
    et al.
    Högskolan i Skövde.
    Billing, Erik
    Högskolan i Skövde.
    Seoane, Fernando
    University of Borås, Faculty of Textiles, Engineering and Business. University of Borås, Faculty of Caring Science, Work Life and Social Welfare. Karolinska Institutet.
    Zhou, Bo
    DFKI.
    Högberg, Dan
    Högskolan i Skövde.
    Hemeren, Paul
    Högskolan i Skövde.
    Categories of touch: Classifying human touch using a soft tactile sensor2017In: The robotic sense of touch: From sensing to understanding, workshop at the IEEE International Conference on Robotics and Automation (ICRA), 29 May, Singapore., 2017Conference paper (Refereed)
  • 37.
    Juell-Skielse, Gustaf
    et al.
    University of Borås, Faculty of Librarianship, Information, Education and IT. Information Technology, University of Borås, Sweden.
    Hjalmarsson Jordanius, Anders
    Information Technology, University of Borås, Sweden and RISE Research Institutes of Sweden AB, Sweden.
    Measuring the Effects of Using Digital Innovation Contests as Policy Tools: Towards an Assessment Instrument2022In: ICEGOV '22: Proceedings of the 15th International Conference on Theory and Practice of Electronic Governance, 2022Conference paper (Other academic)
  • 38.
    Kapur, Jyoti
    University of Borås, Faculty of Textiles, Engineering and Business.
    Engaging with Sense of Smell through Textile Interactions2019In: Distributed, Ambient and Pervasive Interactions: 7th International Conference, DAPI 2019 Held as Part of the 21st HCI International Conference / [ed] Norbert Streitz, Shin’ichi Konomi, Switzerland: Springer, 2019, p. 241-257Conference paper (Refereed)
    Abstract [en]

    This research paper discusses dimension of smell for designing spatial interactions through textiles. The focus in these design examples is combining the sense of touch to actuate the smells. Sense of touch is explored in terms of different tactile sensations that include pressing, rubbing and movement of the body. Through these tactile interactions smells embedded in the textile objects are released. The temporal textile expressions of smells open up for further investigations for designing spaces, as these design examples bring forward the olfactory expressions and proposes frameworks for future research in potential human-computer interactions through our everyday objects and surroundings. The proposal of textile interactions that engage sense of smell and create slow interactions with objects and situations from our daily lives opens up the opportunity to encourage more social interactions within the physical world. These interactions will include computational things, however, in a discreet manner, helping build deep bonds between human to human and human to environment.

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  • 39.
    Karlsson, Leia
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Overgaard, Hanne
    University of Borås, Faculty of Textiles, Engineering and Business.
    Laddinfrastrukturen idag och en inblick i framtiden2021Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report is in a collaboration with Vinnergi AB and is a finalizing report of degree of bachelor in Energy Engineering – specialization in Electric Power Engineering at the University of Borås.

    One of the conclusive solutions to achieve the climate goals Sweden has set is the conversion from vehicles with internal combustion engines to electrical vehicles. At this present time the charging infrastructure for electric cars are well spread over Sweden and a fact is that it will increase.

    This will bring challenges for grid owners all over the country to be able to keep a secure supply of electricity and at the same time ensure a strong grid that will stand a future with more renewable energy. In a step towards smarter grids the Swedish government has decided to implement smart electricity meters. In 2018 the Swedish Energy Markets Inspectorate was assigned to investigate the future value of the smart meters and the result of the report was for all the electricity meters to be changed into smart ones before January 1, 2025.

    This report is divided into two main areas. The first area focuses on the communication between different participants on the market and with individual costumers. The second area3this report covers is a description of where different types of charging could play a role of importance in the future.

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    Examensarbete
  • 40.
    Kelleche, Abdelkarim
    et al.
    Faculté des Sciences et de la Technologie, Université Djilali Bounâama, Route Theniet El Had, Soufay, 44225, Khemis Miliana, Algeria.
    Saedpanah, Fardin
    University of Borås, Faculty of Textiles, Engineering and Business.
    Stabilization of an Axially Moving Euler Bernoulli Beam by an Adaptive Boundary Control2023In: Journal of dynamical and control systems, ISSN 1079-2724, E-ISSN 1573-8698Article in journal (Refereed)
    Abstract [en]

    This paper concerns with the stabilization of an axially moving beam by an adaptive boundary control. We prove existence and uniqueness of the solution by means of nonlinear semigroup theory. Moreover, we construct the control through a low-gain adaptive velocity feedback. We also prove that the designed control is able to stabilize exponentially the closed loop system. Some numerical simulations are given to illustrate the theoretical results.   

  • 41.
    Kelleche, Abdelkarim
    et al.
    Faculty of Sciences and Technology University Djilali Bounâama of Khemis Miliana Khemis Miliana Algeria.
    Saedpanah, Fardin
    University of Borås, Faculty of Textiles, Engineering and Business.
    Abdallaoui, Athmane
    Laboratoire de Mathématiques et Physique Appliquées École Normale Supérieure de Bou Saâda M'Sila Algeria.
    On stabilization of an axially moving string with a tip mass subject to an unbounded disturbance2023In: Mathematical methods in the applied sciences, ISSN 0170-4214, E-ISSN 1099-1476Article in journal (Refereed)
    Abstract [en]

    This paper deals with the stabilization problem of an axially moving string with a tip mass attached at the free end and subject to an external disturbance. The disturbance here is not uniformly bounded, and it is assumed to be exponentially increasing. First, the tip mass equation is designed under a boundary controller. By using this equation, the active disturbance rejection control (ADRC) technique is applied to design a disturbance observer, and it is shown that the observer can be estimated exponentially. Then, the closed-loop system is formulated and the well-posedness of the model is proved in the framework of the semigroup theory. The stability of the closed-loop system is then proved by means of the multiplier technique, where the energy system converges to equilibrium with an exponential manner. The efficiency of the obtained results is verified through numerical simulations. 

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  • 42.
    Kontopoulos, E.
    et al.
    CERTH, Thessaloniki, Greece.
    Darányi, Sándor
    University of Borås, Faculty of Librarianship, Information, Education and IT.
    Wittek, Peter
    University of Borås, Faculty of Librarianship, Information, Education and IT.
    Konstantinidis, K.
    CERTH, Thessaloniki, Greece.
    Riga, M.
    CERTH, Thessaloniki, Greece.
    Mitzias, P.
    CERTH, Thessaloniki, Greece.
    Stavropoulos, T.
    CERTH, Thessaloniki, Greece.
    Andreadis, S.
    CERTH, Thessaloniki, Greece.
    Maronidis, A.
    CERTH, Thessaloniki, Greece.
    Karakostas, A.
    CERTH, Thessaloniki, Greece.
    Tachos, S.
    CERTH, Thessaloniki, Greece.
    Kaltsa, V.
    CERTH, Thessaloniki, Greece.
    Tsagiopoulu, M.
    CERTH, Thessaloniki, Greece.
    Avgerinakis, K.
    CERTH, Thessaloniki, Greece.
    Deliverable 4.5: Context-aware Content Interpretation2016Report (Refereed)
    Abstract [en]

    The current deliverable summarises the work conducted within task T4.5 of WP4, presenting our proposed approaches for contextualised content interpretation, aimed at gaining insightful contextualised views on content semantics. This is achieved through the adoption of appropriate context-aware semantic models developed within the project, and via enriching the semantic descriptions with background knowledge, deriving thus higher level contextualised content interpretations that are closer to human perception and appraisal needs. More specifically, the main contributions of the deliverable are the following: A theoretical framework using physics as a metaphor to develop different models of evolving semantic content. A set of proof-of-concept models for semantic drifts due to field dynamics, introducing two methods to identify quantum-like (QL) patterns in evolving information searching behaviour, and a QL model akin to particle-wave duality for semantic content classification. Integration of two specific tools, Somoclu for drift detection and Ncpol2spda for entanglement detection. An “energetic” hypothesis accounting for contextualized evolving semantic structures over time. A proposed semantic interpretation framework, integrating (a) an ontological inference scheme based on Description Logics (DL), (b) a rule-based reasoning layer built on SPARQL Inference Notation (SPIN), (c) an uncertainty management framework based on non-monotonic logics. A novel scheme for contextualized reasoning on semantic drift, based on LRM dependencies and OWL’s punning mechanism. An implementation of SPIN rules for policy and ecosystem change management, with the adoption of LRM preconditions and impacts. Specific use case scenarios demonstrate the context under development and the efficiency of the approach. Respective open-source implementations and experimental results that validate all the above.All these contributions are tightly interlinked with the other PERICLES work packages: WP2 supplies the use cases and sample datasets for validating our proposed approaches, WP3 provides the models (LRM and Digital Ecosystem models) that form the basis for our semantic representations of content and context, WP5 provides the practical application of the technologies developed to preservation processes, while the tools and algorithms presented in this deliverable can be deployed in combination with test scenarios, which will be part of the WP6 test beds.

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  • 43.
    Kontopoulos, Efstratios
    et al.
    CERTH, Thessaloniki, Greece.
    Riga, Marina
    CERTH, Thessaloniki, Greece.
    Mitzias, P.
    CERTH, Thessaloniki, Greece.
    Andreadis, S.
    CERTH, Thessaloniki, Greece.
    Stavropoulos, T.
    CERTH, Thessaloniki, Greece.
    Konstantinidis, K.
    CERTH, Thessaloniki, Greece.
    Maronidis, A.
    CERTH, Thessaloniki, Greece.
    Karakostas, A.
    CERTH, Thessaloniki, Greece.
    Tachos, S.
    CERTH, Thessaloniki, Greece.
    Kaltsa, V.
    CERTH, Thessaloniki, Greece.
    Tsagiopoulu, M.
    CERTH, Thessaloniki, Greece.
    Darányi, Sándor
    University of Borås, Faculty of Librarianship, Information, Education and IT.
    Wittek, Peter
    University of Borås, Faculty of Librarianship, Information, Education and IT.
    Gill, A.
    King's College London, UK.
    Tonkin, E. L.
    King's College London, UK.
    Waddington, S.
    King's College London, UK.
    Sauter, Ch.
    King's College London, UK.
    Corubolo, F.
    University of Liverpool, UK.
    PERICLES Deliverable 4.4: Modelling Contextualised Semantics2016Report (Refereed)
    Abstract [en]

    The current deliverable summarises the work conducted within task T4.4 of WP4, presenting our proposed models for semantically representing digital content and its respective context – the latter refers to any information coming from the environment of the digital object (DO) that offers a better insight into the object’s status, its  interrelationships with other content items and information about the object’s context of use. Within PERICLES, we refer to the content semantics enriched with the contextual perspective as “contextualised semantics”. The deliverable presents two complementary modelling approaches, based respectively on (a) ontologies and logics, and, (b) multivariate statistics.

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  • 44. Kulinska, Maria
    et al.
    Bruniaux, Pascale
    Ainamo, Antti
    University of Borås, Faculty of Textiles, Engineering and Business.
    VIRTUAL MANNEQUINS AND GARMENT PARAMETRIZATION2016In: VIRTUAL MANNEQUINS AND GARMENT PARAMETRIZATION, 2016Conference paper (Refereed)
  • 45.
    Kumar, Vijay
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business. Soochow University China.
    Hallqvist, Carina
    University of Borås, Faculty of Librarianship, Information, Education and IT.
    Ekwall, Daniel
    University of Borås, Faculty of Textiles, Engineering and Business. Hanken School of Economics, Finland.
    Developing a Framework for Traceability Implementation in the Textile Supply Chain2017In: Systems, ISSN 2079-8954, Vol. 5, no 2, article id 33Article in journal (Refereed)
    Abstract [en]

    Traceability has recently gained considerable attention in the textile industry. Traceability stands for information sharing about a product including the product history, specification, or location. With the involvement of globally dispersed actors in the textile supply chain, ensuring appropriate product quality with timely supplies is crucial for surviving in this industry with ever increasing competition. Hence it is of paramount importance for a supply chain actor to track every product and trace its history in the supply chain. In this context, this paper presents a framework to implement traceability in the textile supply chain. A system approach has been followed, where firstly the usage requirement of traceability is defined, and then a framework for implementing intra-actor or internal traceability and inter-actor or external traceability is discussed. This article further presents a sequential diagram to demonstrate the interaction and information exchange between the actors in the supply chain, when the traceability information is requested. An example is also illustrated for data storage using a relational database management system and information exchange using XML for the textile weaver. Finally, the article discusses challenges and future studies required to implement traceability in the textile supply chain.

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  • 46.
    Kumar, Vijay
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Pal, Rudrajeet
    University of Borås, Faculty of Textiles, Engineering and Business.
    A demonstrative framework for blockchain-based decentralized traceability in textile supply chain2022Conference paper (Refereed)
    Abstract [en]

    Purpose of this paper:

    Textile supply chains are complex due to their globally dispersed, multi-tiered structure, which contributes largely to the lack of sustainability and visibility (Garcia-Torres et al., 2021). In this context, traceability plays a major problem-solving role, but is difficult to implement uniformly across the entire supply chain by a single actor or a central authority (Kumar et al., 2017); however blockchain-based traceability system could be prospective (Agrawal et al., 2021). This paper aims at developing and testing a decentralized framework for blockchain-based traceability for the textile supply chain that requires no central authority, and the interaction is governed by smart contracts in a digital environment.  

     

    Design/methodology/approach:

    A multistage approach is followed to develop a blockchain-based traceability framework. In the first stage, smart contracts – that govern the interactions of the supply chain actors while keeping the material traceability through mass balancing concept – for decentralized interactions were designed. The second stage implements the developed smart contracts on an Ethereum virtual environment where the interaction of the supply chain stakeholders and the supply chain transaction were recorded on a distributed register, or blockchain. Finally, the implemented system is tested using a discrete event simulation which demonstrates the implication of the framework for the textile supply chain. 

     

    Findings:

    The blockchain system is managed by multiple actors (also known as nodes) which are incentivized for implementing or registering the transactions on the blockchain. In this work, the smart contracts that govern the interactions of the supply chain stakeholders were linked to the material flow and mass balancing on each transaction. However, keeping the lot or batch information on each production stage increased transaction data which has subsequently resulted in a higher cost for registering a transaction on the Ethereum blockchain. Furthermore, the analysis reveals the role of certification authority when mass balancing cannot be carried out.

     

    Value:

    The paper proposes a framework for implementing blockchain-based traceability and then testing by using discrete event simulation. Therefore, the study not only makes theoretical contributions by proposing a new traceability framework but also tests it in a computer-simulated environment to understand its practical implication. 

     

    Research limitations/implications:

    The discrete event simulation considers the role of sellers and buyers while not accounting for the operations of intermediate stakeholders such as transporters. Therefore, the role of these stakeholders needs further to explore to establish the full impact of the proposed framework.  

     

    Practical implications:

    The paper provides an insight into peer-to-peer interactions of supply chain actors in blockchain and cost analysis of registering transactions on a distributed ledger that create a pathway for decentralized traceability system in the textile industry. 

     

      

    References:

     Agrawal, T. K., Kumar, V., Pal, R., Wang, L., & Chen, Y. (2021). Blockchain-based framework for supply chain traceability: A case example of textile and clothing industry. Computers & Industrial Engineering, 154, 107130.

    Garcia-Torres, S., Rey-Garcia, M., Sáenz, J., & Seuring-Stella, S. (2021). Traceability and transparency for sustainable fashion-apparel supply chains. Journal of Fashion Marketing and Management: An International Journal. https://doi.org/10.1108/JFMM-07-2020-0125

    Kumar, V., Hallqvist, C., & Ekwall, D. (2017). Developing a framework for traceability implementation in the textile supply chain. Systems, 5(2), 33.

  • 47. Kuzmicova, Anezka
    et al.
    Dias, Patricia
    Vogrincic Cepic, Ana
    Albrechtslund, Anne-Mette
    Kotrla Topic, Marina
    Minguez Lopez, Xavier
    Nilsson, Skans Kersti
    University of Borås, Faculty of Librarianship, Information, Education and IT.
    Teixeira-Botelho, Ines
    Social Space in Silent Reading Practices2017Conference paper (Refereed)
  • 48.
    Li, Cai
    et al.
    Cognitiona and Interaction Lab, School of Informatics, University of Skövde, Sweden.
    Bredies, Katharina
    Design Research Lab Berlin.
    Lund, Anja
    University of Borås, Faculty of Textiles, Engineering and Business.
    Nierstrasz, Vincent
    University of Borås, Faculty of Textiles, Engineering and Business.
    Hemeren, Paul
    Cognition and Interaction Lab, School of Informatics, University of Skövde, Sweden.
    Högberg, Dan
    School of Engineering Science, University of Skövde, Sweden.
    kNN based Numerical Hand Posture Recognition using a Smart Textile Glove2015In: Ambient 2015: The Fifth International Conference on Ambient Computing, Applications, Services and Technologies / [ed] Maarten Weyn, 2015, p. 36-41Conference paper (Refereed)
  • 49.
    Lind, Carl Mikael
    et al.
    Division of Ergonomics, KTH Royal Institute of Technology.
    Sandsjö, Leif
    University of Borås, Faculty of Caring Science, Work Life and Social Welfare.
    Mahdavian, Nafise
    School of Engineering Science; University of Skövde.
    Högberg, Dan
    School of Engineering Science; University of Skövde.
    Hanson, Lars
    School of Engineering Science; University of Skövde.
    Olivares, Jose Antonio Diaz
    Division of Ergonomics, KTH Royal Institute of Technology.
    Yang, Liyun
    Unit of Occupational Medicine, Karolinska Institutet.
    Forsman, Mikael
    Division of Ergonomics, KTH Royal Institute of Technology.
    Prevention of Work-Related Musculoskeletal Disorders Using Smart Workwear – The Smart Workwear Consortium2019In: International Conference on Human Systems Engineering and Design: Future Trends and Applications: Human Systems Engineering and Design. IHSED 2018. Advances in Intelligent Systems and Computing, vol 876. Springer, Cham / [ed] Ahram T., Karwowski W., Taiar R. (eds), Springer, Cham , 2019, Vol. 876, p. 477-483Conference paper (Other academic)
    Abstract [en]

    Adverse work-related physical exposures such as repetitive movements and awkward postures have negative health effects and lead to large financial costs. To address these problems, a multi-disciplinary consortium was formed with the aim of developing an ambulatory system for recording and analyzing risks for musculoskeletal disorders utilizing textile integrated sensors as part of the regular workwear. This paper presents the consortium, the Smart Workwear System, and a case study illustrating its potential to decrease adverse biomechanical exposure by promoting improved work technique.

  • 50. Löfgren, N.
    et al.
    Lindecrantz, Kaj
    University of Borås, School of Engineering.
    Flisberg, A.
    Bågenholm, R.
    Kjellmer, I.
    Thordstein, M.
    Spectral Distance for ARMA Models Applied to Electroencephalogram for Early Detection of Hypoxia.2006In: Journal of Neural Engineering, ISSN 1741-2560, E-ISSN 1741-2552, Vol. 3, no 3, p. 227-234Article in journal (Refereed)
12 1 - 50 of 90
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