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  • 101.
    Parokaran, Jessy
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Argunsah, Ali Özgur
    Sabanci University,Istanbul,Turkey .
    Çürüklü, Baran
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Cetin, Mujdat
    Sabanci University,Istanbul,Turkey .
    Analysis of EEG Signals for Brain Computer Interface2009Konferansepaper (Fagfellevurdert)
  • 102.
    Pathi, Sai Krishna
    et al.
    Örebro University, Sweden.
    Kiselev, Andrey
    Örebro University, Sweden.
    Kristoffersson, Annica
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Repsilber, Dirk
    Örebro University, Sweden.
    Loutfi, Amy
    Örebro University, Sweden.
    A Novel Method for Estimating Distances from a Robot to Humans Using Egocentric RGB Camera2019Inngår i: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 19, nr 14, artikkel-id E3142Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Estimating distances between people and robots plays a crucial role in understanding social Human-Robot Interaction (HRI) from an egocentric view. It is a key step if robots should engage in social interactions, and to collaborate with people as part of human-robot teams. For distance estimation between a person and a robot, different sensors can be employed, and the number of challenges to be addressed by the distance estimation methods rise with the simplicity of the technology of a sensor. In the case of estimating distances using individual images from a single camera in a egocentric position, it is often required that individuals in the scene are facing the camera, do not occlude each other, and are fairly visible so specific facial or body features can be identified. In this paper, we propose a novel method for estimating distances between a robot and people using single images from a single egocentric camera. The method is based on previously proven 2D pose estimation, which allows partial occlusions, cluttered background, and relatively low resolution. The method estimates distance with respect to the camera based on the Euclidean distance between ear and torso of people in the image plane. Ear and torso characteristic points has been selected based on their relatively high visibility regardless of a person orientation and a certain degree of uniformity with regard to the age and gender. Experimental validation demonstrates effectiveness of the proposed method.

  • 103.
    Pathi, Sai Krishna
    et al.
    Örebro University, Sweden.
    Kristoffersson, Annica
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Kiselev, Andrey
    Örebro University, Sweden.
    Loutfi, Amy
    Örebro University, Sweden.
    F-Formations for Social Interaction in Simulation Using Virtual Agents and Mobile Robotic Telepresence Systems2019Inngår i: Multimodal Technologies and Interaction, ISSN 2414-4088, Vol. 3, nr 4, artikkel-id 69Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    F-formations are a set of possible patterns in which groups of people tend to spatially organize themselves while engaging in social interactions. In this paper, we study the behavior of teleoperators of mobile robotic telepresence systems to determine whether they adhere to spatial formations when navigating to groups. This work uses a simulated environment in which teleoperators are requested to navigate to different groups of virtual agents. The simulated environment represents a conference lobby scenario where multiple groups of Virtual Agents with varying group sizes are placed in different spatial formations. The task requires teleoperators to navigate a robot to join each group using an egocentric-perspective camera. In a second phase, teleoperators are allowed to evaluate their own performance by reviewing how they navigated the robot from an exocentric perspective. The two important outcomes from this study are, firstly, teleoperators inherently respect F-formations even when operating a mobile robotic telepresence system. Secondly, teleoperators prefer additional support in order to correctly navigate the robot into a preferred position that adheres to F-formations.

  • 104.
    Persson, Anders
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Platform development of body area network for gait symmetry analysis using IMU and UWB technology2018Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Having a device with the capability of measure motions from gait produced by a human being, could be of most importance in medicine and sports. Physicians or researchers could measure and analyse key features of a person's gait for the purpose of rehabilitation or science, regarding neurological disabilities. Also in sports, professionals and hobbyists could use such a device for improving their technique or prevent injuries when performing. In this master thesis, I present the research of what technology is capable of today, regarding gait analysis devices. The research that was done has then help the development of a suggested standalone hardware sensor node for a Body Area Network, that can support research in gait analysis. Furthermore, several algorithms like for instance UWB Real-Time Location and Dead Reckoning IMU/AHRS algorithms, have been implemented and tested for the purpose of measuring motions and be able to run on the sensor node device. The work in this thesis shows that a IMU sensor have great potentials for generating high rate motion data while performing on a small mobile device. The UWB technology on the other hand, indicates a disappointment in performance regarding the intended application but can still be useful for wireless communication between sensor nodes. The report also points out the importance of using a high performance micro controller for achieving high accuracy in measurements.

  • 105.
    Petrovic, Nikola
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Fotouhi, Hossein
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Tomasic, Ivan
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Björkman, Mats
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Lindén, Maria
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    A remote health monitoring system featuring relational databases2017Inngår i: Medicinteknikdagarna 2017 MTD 2017, Västerås, Sweden, 2017Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Remote health monitoring (RHM) through the use of wearable wireless sensors, has drawn a lot of attention from academia and industry in the last decade [1,2]. The aging population, increasing cost of health-care, and lack of human resources in healthcare, are the three key motivators for the development of RHM [3,4]. The RHM systems should reduce health care costs and improve care quality. How to ensure a reliable and secure data collection from sensor devices to stake holders in RHM systems, is an open research question. The most established data storage technology that can ensure the security and privacy of data is the relational database management systems (RDBMSs). Besides security, RDBMSs provide a number of additional convenient features like querying the data, indexing, backups, replication, but are however in general slower than storing the data directly in a file system. Presented is a RHM system with a RDBMS in its core. The system was developed for the needs of ESS-H research profile [5] at Mälardalen University, Sweden. We also present a comprehensive system design which covers all the needs for the RHM application. The system is composed of four main components: (I) Shimmer sensors [6], (II) data acquisition layer (LabVIEW or C#.NET program), (III) RDBMS, and (IV) web service and web interface. The system communicates with the Shimmer sensors over Bluetooth and collects measurements in a relational database, either through a C#.NET or a LabVIEW program. The web service and a web interface are both written in PHP and are running on the Apache HTTP Server. The end-user is able to observe either real-time data (i.e. with insignificant delay) or processed historical data on any web browser. The advantage of using the web interface instead of a desktop application is that it makes the presentation layer easily accessible and platform independent. The RDBMSs provide data security and privacy in addition to other convenient features. Therefore, it is beneficial to incorporate RDBMSs in RHM systems. However, the RDBMSs provide no solution for security and privacy issues in wireless communication which is another research problem.

  • 106.
    Philip, Bengtsson
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Ludvig, Persson
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Medicinteknisk produktutveckling: Fixeringsteknik för talonaviculär artrodes2016Independent thesis Basic level (university diploma), 10 poäng / 15 hpOppgave
    Abstract [en]

    ABSTRACT

    The purpose of this study is to develop a fixation technique for talonavicular arthrodesis. A talonavicular arthrodesis is a problematic arthrodesis of the foot and is done when the patient is suffering from pain in the joint. There are two difficulties with this operation. At first, the operation is problematic in that it is difficult to reach the talus and navicular bones. The bones are positioned deep within the foot and surrounded by many other bones and tendons. This makes it difficult to fixate the bones. This problem indirectly causes the other problem. The fact that it is difficult to fixate the bones results in no direct method to perform the operation. Different surgeons have different solutions to fixate the bones which makes the operation vary in results depending on the surgeon who performs the operation.

    This thesis is a start-up of the project to solve the problem with a talonavicular arthrodesis. Therefore, the aim of the thesis is to investigate whether it is possible to find a standardized method of the operation and reach a final concept that could solve the problems with the operation.

    The method chosen for this project has been shaped by the standard EN ISO 13485:2016, which deals with quality management systems and requirements for regulatory purposes for medical devices. Behind the thesis is a case study carried out in parallel with a literature study which is the basis for this thesis

    The product development has been characterized by the regulatory requirements, as the medical device industry requires. The project began with a project planning which was then followed by a problem understanding phase. When the problem understanding phase was completed a concept development phase began that led to concept evaluation.

    The result of this project is a final concept. The concept is a staple designed with a strong focus on stress distribution in the joint surface and the limitations of accessibility to the joint. The concept is designed to standardize the fixation on talonavicular arthrodesis.

    The conclusion of the project is that the concept is considered interesting to go on with. However, a deeper understanding of quality assurance has been obtained during the project. The understanding has contributed to the realization that further validation and verification is required in order to realize the concept into a real product. Recommendations to proceed with the project is to do more tests and creating a quality assurance system that meets the requirements of the “Medical product agency”.

  • 107.
    Philip, Ragnartz
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Staffanson, Axel
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Produktutveckling av medicinteknisk produkt, Suture passer2016Independent thesis Basic level (university diploma), 10 poäng / 15 hpOppgave
    Abstract [en]

    The following report has been prepared based upon an assignment given by the company, Ortopedic Care Scandinavia AB. The paper is an exam on basic level, 15 credit points at higher level education within product development.

    Ortopedic Care Scandinavia AB is working with product development of medical technology products. What makes the corporate unique is the fact that the development is based upon problems encountered by surgeons in their daily work. Suggestions for improvement in technology are given directly by the end users. This paper is based upon such problems.

    Product development was made on the medical instrument called, suture passer. The instrument is used in endoscopic surgery of the rotator cuff. The cuff is a group of four muscles (and their respective tendons) that stabilize the shoulder. In case of an accident, mostly sport related, these muscles can loosen from the bone. In surgery a suture passer is then used to penetrate the injured tendon with a needle with an attached suture. The passer creates a loop of suture that can be used to attach the damaged tendon.

    The report is based upon the following problem formulations:

    • The needle has an inconvenient edge that can damage the muscle.
    • The strength of the suture thread is deteriorated by the design of the needle.
    • The suture thread has been known to snap when the surgeon apply to much pressure when tying.
    • If the patient is suffering from subacromial impingement the jaw of the instrument can appear to be clumsy and hard to open.
    • The jaw has sharp teeth which have been known to get stuck in the tendon. The surgeon must then perform an uncontrolled movement which might damage the tendon.
    • The jaw limits the surgeons’ choice of thickness of the suture thread.
    • The thickness of the needle used in the suture passer is limited to one size. 

    The purpose of the project is to develop a new concept that minimizes the risk for the patient and at the same time the concept should facilitate the work of the surgeon. The concept should meet the set requirements and be presented in the form of renderings of CAD-models and drawings.

    To achieve this process the instrument uses four different components. The needle, the jaw, the handle and an attachment between the needle and the handle.  Under heading 5, the generating process, each component presents to together with arguments of its design. The instrument consist of 25 components that are all developed from the ground up.

    The result should be viewed as a thorough concept that can be used for further development. It is recommended that the next step should be an investigation about material choice. When the material is specified a prototype should be manufacture and then used for testing. 

  • 108.
    Prytz, Erik
    et al.
    Linköpings Universitet.
    Kristoffersson, Annica
    Örebro Universitet.
    Lindén, Maria
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system. IS (Embedded Systems).
    Petrovic, Nikola
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system. IS (Embedded Systems).
    Ahmed, Mobyen Uddin
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system. IS (Embedded Systems).
    Lind, Leili
    Linköpings Universitet.
    E-care@home: Initial Usability Considerations2016Inngår i: Abstractproceedings from Medicinteknikdagarna 2016, Örebro, Sweden, 2016Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The E-care@home project aims to develop a smart sensor and communication infrastructure with semantic interoperability capable of monitoring patients in their home. The system will use a wide array of sensors, both medical and environmental, and an advanced computer reasoning layer capable of interpreting sensor data and deliver natural language summaries of the patient health status. One critical issue is that of the usability of such a system to the users, i.e. patients and care providers.

  • 109.
    Rahman, Hamidur
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Ahmed, Mobyen Uddin
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Begum, Shahina
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Non-contact heart rate monitoring using lab color space2016Inngår i: Studies in Health Technology and Informatics, 2016, Vol. 224, s. 46-53Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Research progressing during the last decade focuses more on non-contact based systems to monitor Heart Rate (HR) which are simple, low-cost and comfortable to use. Most of the non-contact based systems are using RGB videos which is suitable for lab environment. However, it needs to progress considerably before they can be applied in real life applications. As luminance (light) has significance contribution on RGB videos HR monitoring using RGB videos are not efficient enough in real life applications in outdoor environment. This paper presents a HR monitoring method using Lab color facial video captured by a webcam of a laptop computer. Lab color space is device independent and HR can be extracted through facial skin color variation caused by blood circulation considering variable environmental light. Here, three different signal processing methods i.e., Fast Fourier Transform (FFT), Independent Component Analysis (ICA) and Principal Component Analysis (PCA) have been applied on the color channels in video recordings and blood volume pulse (BVP) has been extracted from the facial regions. In this study, HR is subsequently quantified and compare with a reference measurement. The result shows that high degrees of accuracy have been achieved compared to the reference measurements. Thus, this technology has significant potential for advancing personal health care, telemedicine and many real life applications such as driver monitoring.

  • 110.
    Rahman, Hamidur
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Ahmed, Mobyen Uddin
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Begum, Shahina
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Vision-Based Remote Heart Rate Variability Monitoring using Camera2018Inngår i: Lecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering, LNICST, Volume 225, 2018, s. 10-18Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Heart Rate Variability (HRV) is one of the important physiological parameter which is used to early detect many fatal disease. In this paper a non-contact remote Heart Rate Variability (HRV) monitoring system is developed using the facial video based on color variation of facial skin caused by cardiac pulse. The lab color space of the facial video is used to extract color values of skin and signal processing algorithms i.e., Fast Fourier Transform (FFT), Independent Component Analysis (ICA), Principle Component Analysis (PCA) are applied to monitor HRV. First, R peak is detected from the color variation of skin and then Inter-Beat-Interval (IBI) is calculated for every consecutive R-R peak. HRV features are then calculated based on IBI both in time and frequency domain. MySQL and PHP programming language is used to store, monitor and display HRV parameters remotely. In this study, HRV is quantified and compared with a reference measurement where a high degree of similarities is achieved. This technology has significant potential for advancing personal health care especially for telemedicine.

  • 111.
    Rastegar, S.
    et al.
    Auckland University of Technology, Auckland, New Zealand.
    Gholamhosseini, H.
    Auckland University of Technology, Auckland, New Zealand.
    Lowe, A.
    Auckland University of Technology, Auckland, New Zealand.
    Mehdipour, F.
    Otago Polytechnic, Auckland, New Zealand.
    Lindén, Maria
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Estimating Systolic Blood Pressure Using Convolutional Neural Networks2019Inngår i: Studies in Health Technology and Informatics, ISSN 0926-9630, E-ISSN 1879-8365, Vol. 261, s. 143-149Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Continuous blood pressure (BP) monitoring can produce a significant amount of digital data, which increases the chance of early diagnosis and improve the rate of survival for people diagnosed with hypertension and Cardiovascular diseases (CVDs). However, mining and processing this vast amount of data are challenging. This research is aimed to address this challenge by proposing a deep learning technique, convolutional neural network (CNN), to estimate the systolic blood pressure (SBP) using electrocardiogram (ECG) and photoplethysmography (PPG) signals. Two different methods are investigated and compared in this research. In the first method, continuous wavelet transform (CWT) and CNN have been employed to estimate the SBP. For the second method, we used random sampling within the stochastic gradient descent (SGD) optimization of CNN and the raw ECG and PPG signals for training the network. The Medical Information Mart for Intensive Care (MIMIC III) database is used for both methods, which split to two parts, 70% for training our network and the remaining used for testing the performance of the network. Both methods are capable of learning how to extract relevant features from the signals. Therefore, there is no need for engineered feature extraction compared to previous works. Our experimental results show high accuracy for both CNN-based methods which make them promising and reliable architectures for SBP estimation.

  • 112.
    Rattfält, Linda
    et al.
    Linköping University, Linköping, Sweden.
    Ahlström, Christer
    Linköping University, Linköping, Sweden.
    Berglin, Lena
    University College of Borås, Borås, Sweden .
    Lindén, Maria
    Mälardalens högskola, Institutionen för datavetenskap och elektronik.
    Hult, Peter
    Linköping University, Linköping, Sweden.
    Ask, Per
    Linköping University, Linköping, Sweden.
    Wiklund, Urban
    Umeå University Hospital, Umeå, Sweden.
    A canonical correlation approach to heart beat detection in textile ECG measurements2006Inngår i: IET Conference Publications, Issue 520, 2006Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Research in textile sensors has lead to new ways to measure electrocardiograms (ECG). However, additional disturbances from, for example, muscular noise and high skin-electrode impedances often result in poor signal quality. The paper contains a simple application of canonical correlation analysis (CCA) on multi channel ECG signals recorded with textile electrodes. Using CCA to solve the blind source separation (BSS) problem, we intend to separate the ECG signal from the various noise sources. The method (CCABSS) was compared to simple averaging of the ECG channels and to the independent component analysis method (ICA). A heart beat detector was used to evaluate the signal quality. Results show that the signal was completely lost while simulating various noise in 33%, 17% and 7% of the cases for averaging, ICA and CCA, respectively.

  • 113.
    Rattfält, Linda
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Hagström, Caroline
    Lindén, Maria
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Hult, Peter
    Implementation of a technical system in distributed care: attitudes and possibilities2005Inngår i: Proceedings of 13th Nordic Baltic Conference on Biomedical Engineering and Medical Physics, 2005, 2005Konferansepaper (Annet vitenskapelig)
  • 114.
    Rattfält, Linda
    et al.
    Linköping University, Linköping, Sweden.
    Lindén, Maria
    Mälardalens högskola, Institutionen för datavetenskap och elektronik.
    Hult, Peter
    Linköping University, Linköping, Sweden.
    Berglin, Lena
    University College of Borås, Borås, Sweden.
    Ask, Per
    Linköping University, Linköping, Sweden.
    Electrical characteristics of conductive yarns and textile electrodes for medical applications2007Inngår i: Medical and Biological Engineering and Computing, ISSN 0140-0118, Vol. 45, nr 12, s. 1251-1257Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Clothing with conductive textiles for health care applications has in the last decade been of an upcoming research interest. An advantage with the technique is its suitability in distributed and home health care. The present study investigates the electrical properties of conductive yarns and textile electrodes in contact with human skin, thus representing a real ECG-registration situation. The yarn measurements showed a pure resistive characteristic proportional to the length. The electrodes made of pure stainless steel (electrode A) and 20% stainless steel/80% polyester (electrode B) showed acceptable stability of electrode potentials, the stability of A was better than that of B. The electrode made of silver plated copper (electrode C) was less stable. The electrode impedance was lower for electrodes A and B than that for electrode C. From an electrical properties point of view we recommend to use electrodes of type A to be used in intelligent textile medical applications.

  • 115.
    Risman, Per Olov
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Otterskog, Magnus
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Petrovic, Nikola
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system. IS (Embedded Systems).
    Översikt av mikrovågsbaserad diagnostik för brösttumörer och stroke2017Inngår i: Medicinteknikdagarna 2017 MTD 2017, Västerås, Sweden, 2017Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Forskningsområdet mikrovågsavbildning inom medicinen introducerades redan på 1980-talet av Larsen och Jacobi [1]. Objektet var en hundnjure nedsänkt i en mikrovågsabsorberande vätska (bolus) för att undvika störningar och direkt koppling mellan de två roterande antennmatriserna. Man fann att intressant mikrovågskontrastverkan kunde uppnås i biologiska objekt. Fördelar jämfört med mammografi är ex.vis att strålningen är helt ofarlig och att man kan »se» närmare revbenen. Nackdelen är att detaljbilden blir sämre om objektet är stort. Ett relativt enkelt sådant system har utvecklats på MDH [2]. System av denna typ innefattar krav på omfattande matematiska beräkningar för att få fram en bild. Idag anses den ledande utvecklingen ske av Meaney [3] som nu även tar fram ett system på Chalmers i Göteborg. System för stroke- och hjärnblödningsdetektion är under utveckling hos EMTensor i Österrike [4,5] och Medfield diagnostics i Göteborg [6]. Problemen med direkt vågutbredning med s.k. ytvågor längs skallytan blir stora eftersom man inte kan sänka ned skallen i vätska. Absorberande s.k. bolusar och även viss metallisk avskärmning (»huva») används av EM Tensor. En forskningsgrupp under Abbosh [7] har i laboratoriemiljö helt utan störningar lyckats uppnå vissa resultat utan bolusanvändning. Typiska antenner är modifierade kommunikationsantenner och man använder ett spektrum av frekvenser. Återigen blir systemen beräkningsintensiva. På MDH utvecklas f.n. två olika system. Det första har tredimensionella antenner och speciella åtgärder för eliminering av ytvågorna [8] samt kräver matematiska beräkningar som alla de föregående. Det andra bygger på en annan princip: polariserad direktdetektion av den. s.k. diffraktionen från exv. hjärnblödningsområdet och användning av vad som inte är antenner i vanlig mening [9]. Endast mycket enkel bildbehandling krävs, inte heller statistisk träning krävs för framtagning av slutdata så som tillämpas i exv. oljeindustrin för bestämning av olja/vatten/gas med mikrovågsteknik. Sammanfattningsvis karaktäriseras området av ett flertal aktiviteter, varav några pågått i många år. Orsaker till tidsutdräkterna är dels givetvis de allmänna svårigheterna med mikrovågsavbildning, men en ytterligare orsak är att mikrovågsvetenskapen och tekniken i sig är tvärvetenskaplig. En konsekvens av detta är att man inte tillräckligt tidigt ägnat sig åt de speciella ytvågs- och diffraktionsfenomen som kan förbättra mätresultaten.

  • 116.
    Salonen, Antti
    Mälardalens högskola, Akademin för innovation, design och teknik, Innovation och produktrealisering.
    The need for a holistic view on dependable production systems2018Inngår i: Procedia Manufacturing, Elsevier B.V. , 2018, s. 17-22Konferansepaper (Fagfellevurdert)
    Abstract [en]

    When discussing dependability of mechanized, discrete item production, the focus tends to be on maintenance. By studying experiences and breakdown data from eight automotive manufacturing sites in Sweden, a new view on the problem arises. It seems that on average, 40% of the breakdowns are related to poor maintenance practices. This indicates that maintenance management is not the dominant cause of breakdowns. Rather, companies should focus on human factors, e.g. skills, routines, and workload, among operators, as well as maintenance staff. Also, the Early Equipment Management process requires more attention in order to increase the dependability in the production system.

  • 117.
    Sepehri, A. A.
    et al.
    CAPIS Biomedical Research and Development Department, Mons, Belgium.
    Kocharian, A.
    Tehran University of Medical Sciences, Tehran, Iran.
    Janani, A.
    AIMS Industrial Group, Tehran, Iran.
    Gharehbaghi, Arash
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    An Intelligent Phonocardiography for Automated Screening of Pediatric Heart Diseases2016Inngår i: Journal of medical systems, ISSN 0148-5598, E-ISSN 1573-689X, Vol. 40, nr 1, s. 1-10, artikkel-id 16Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper presents a robust device for automated screening of pediatric heart diseases based on our unique processing method in murmur characterization; the Arash-Band method. The present study modifies the Arash-Band method and employs output of the modified method in conjunction with the two other original techniques to extract indicative feature vectors for the screening. The extracted feature vectors are classified by using the support vector machine method. Results show that the proposed modifications significantly enhances performance of the Arash-Band in terms of the both accuracy and sensitivity as the corresponding effect sizes are sufficiently large. The proposed algorithm has been incorporated into an Android-based tablet to constitute an intelligent phonocardiogram with the automatic screening capability. In order to obtain confidence interval of the accuracy and sensitivity, an inferable statistical test is applied on our database containing the phonocardiogram signals recorded from 263 of the referrals to a hospital. The expected value of the accuracy/sensitivity is estimated to be 87.45 % / 87.29 % with a 95 % confidence interval of (80.19 % – 92.47 %) / (76.01 % – 95.78 %) exhibiting superior performance than a pediatric cardiologist who relies on conventional or even computer-assisted auscultation. 

  • 118.
    Sepehri, Amir A.
    et al.
    Amir Kabir University, Tehran, Iran.
    Ghareh Baghi, Arash
    Amir Kabir University, Tehran, Iran.
    Dutoit, Thierry
    TCTS Laboratory, Faculte Polytecnique de Mons, Belgium.
    Kocharian, Armen
    Medical University of Tehran, Iran.
    Kiani, A.
    Medical University of Tehran, Iran.
    A novel method for pediatric heart sound segmentation without using the ECG2010Inngår i: Computer Methods and Programs in Biomedicine, ISSN 0169-2607, E-ISSN 1872-7565, Vol. 99, nr 1, s. 43-48Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this paper, we propose a novel method for pediatric heart sounds segmentation by paying special attention to the physiological effects of respiration on pediatric heart sounds. The segmentation is accomplished in three steps. First, the envelope of a heart sounds signal is obtained with emphasis on the first heart sound (Si) and the second heart sound (S(2)) by using short time spectral energy and autoregressive (AR) parameters of the signal. Then, the basic heart sounds are extracted taking into account the repetitive and spectral characteristics of Si and S2 sounds by using a Multi-Layer Perceptron (MLP) neural network classifier. In the final step, by considering the diastolic and systolic intervals variations due to the effect of a child's respiration, a complete and precise heart sounds end-pointing and segmentation is achieved. 

  • 119.
    Sepehri, Amir A.
    et al.
    TCTS Laboratory, Faculte Polytecnique de Mons, Belgium.
    Hancq, Joel
    TCTS Laboratory, Faculte Polytecnique de Mons, Belgium.
    Dutoit, Thierry
    TCTS Laboratory, Faculte Polytecnique de Mons, Belgium.
    Ghareh Baghi, Arash
    TCTS Laboratory, Faculte Polytecnique de Mons, Belgium.
    Kocharian, Armen
    Children Hospital, Tehran University of Medical Sciences, Iran .
    Kiani, A.
    Children Hospital, Tehran University of Medical Sciences, Iran .
    Computerized screening of children congenital heart diseases2008Inngår i: Computerized screening of children congenital heart diseases CMPB, ISSN 0169-2607, Vol. 92, nr 2, s. 186-192Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this paper, we propose a method for automated screening of congenital heart diseases in children through heart sound analysis techniques. Our method relies on categorizing the pathological murmurs based on the heart sections initiating them. We show that these pathelogical murmur categories can be identified by examining the heart sound energy over specific frequency bands, which we call, Arash-Bands. To specify the Arash-Band for a category, we evaluate the energy of the heart sound over all possible frequency bands. The Arash-Band is the frequency band that provides the lowest error in clustering the instances of that category against the normal ones. The energy content of the Arash-Bands for different categories constitue a feature vector that is suitable for classification using a neural network. In order to train, and to evaluate the performance of the proposed method, we use a training data-bank, as well as a test data-bank, collectively consisting of ninety samples (normal and abnormal). Our results show that in more than 94% of cases, our method correctly identifies children with congenital heart diseases. This percentage improves to 100%, when we use the Jack-Knife validation method over all the 90 samples.

  • 120.
    Solis, J.
    et al.
    Karlstad University, Sweden.
    Lindeborg, Ann-Louise
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system. Camanio Care AB, Sweden.
    Saijo, M.
    Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo, Japa.
    Takeda, Y.
    Zhang, C.
    Waseda University, Okubo, Shinjuku-ku, Tokyo, Japan.
    Takeda, R.
    Leave a Nest Co., Ltd., Shimomiyabi-cho, Shinjuku-ku, Tokyo, Japan.
    Japan-Sweden Academia-industry international collaboration: Challenges in developing a robotic assistive eating device for frail elderly's independent life2017Inngår i: CEUR Workshop Proceedings, Volume 2059, 2017, Vol. 2959, s. 61-65Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This project aims at making a mock-up of a multi grip tool for a robotic assistive device and a camera system which enable frail elderly to live more independently and to keep track of their food intake. The robot will be developed through user centered design with analyses of real use cases in Japan and Sweden. Thanks to the collaborating researchers with a strong applied research approach as well as the companies with a strong experience in engineering solutions in both the Japanese and Swedish teams, the functionalities of Bestic, an assistive eating device, could be enhanced for commercial use, and distributed to municipalities and to the general pub.

  • 121.
    Tidare, Jonatan
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Åstrand, Elaine
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Ekström, Martin C.
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Evaluation of closed-loop feedback system delay a time-critical perspective for neurofeedback training2018Inngår i: BIODEVICES 2018 - 11th International Conference on Biomedical Electronics and Devices, Proceedings; Part of 11th International Joint Conference on Biomedical Engineering Systems and Technologies, BIOSTEC 2018, SciTePress , 2018, s. 187-193Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Neurofeedback in real-time has proven effective when subjects learn to control a BCI. To facilitate learning, a closed-loop feedback system should provide neurofeedback with maximal accuracy and minimal delay. In this article, we propose a modular system for real-time neurofeedback experiments and evaluate its performance as a function of increased stress level applied to the system. The system shows stable behavior and decent performance when streaming with many EEG channels (36-72) and 500-5000 Hz, which is common in BCI setups. With very low data loads (1 channel, 500-1000 Hz) the performance dropped significantly and the system became highly unpredictable. We show that the system delays did not correlate linearly with the stress-level applied to the system, emphasizing the importance of system delay tests before conducting real-time BCI-experiments. 

  • 122.
    Tomasic, Ivan
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Avbelj, V.
    Jožef Stefan Institute, Ljubljana, Slovenia .
    Trobec, R.
    Jožef Stefan Institute, Ljubljana, Slovenia .
    Smart wireless sensor for physiological monitoring2015Inngår i: Studies in Health Technology and Informatics, vol. 211, 2015, s. 295-301Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Presented is a wireless body sensor capable of measuring local potential differences on a body surface. By using on-sensor signal processing capabilities, and developed algorithms for off-line signal processing on a personal computing device, it is possible to record single channel ECG, heart rate, breathing rate, EMG, and when three sensors are applied, even the 12-lead ECG. The sensor is portable, unobtrusive, and suitable for both inpatient and outpatient monitoring. The paper presents the sensor's hardware and results of power consumption analysis. The sensor's capabilities of recording various physiological parameters are also presented and illustrated. The paper concludes with envisioned sensor's future developments and prospects.

  • 123.
    Tomasic, Ivan
    et al.
    Jozef Stefan Institute, Ljubljana, Slovenia.
    Frljak, Sabina
    University Medical Center, Ljubljana, Slovenia.
    Trobec, Roman
    Jozef Stefan Institute, Ljubljana, Slovenia.
    Estimating the universal positions of wireless body electrodes for measuring cardiac electrical activity2013Inngår i: IEEE Transactions on Biomedical Engineering, ISSN 0018-9294, E-ISSN 1558-2531, Vol. 60, nr 12, s. 3368-3374, artikkel-id 6574211Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A methodology is presented for estimating the wireless body electrode (WE) positions and for calculating the linear transformations that enable the synthesis of a 12-lead ECG or a multichannel ECG from three WEs, which in turn simplifies and improves the acquisition of ECGs. We present, compare, and evaluate three approaches to the synthesis: fully personalized, fully universal, and combined with universal leads and personalized transformations. The evaluation results show that WEs are an acceptable alternative to the standard 12-lead ECG device for patients with chronic myocardial ischemia, if either the fully personalized or combined approach is used. The median correlation coefficients are all higher than 0.94 and 0.92 for the fully personalized and combined approaches, respectively. The corresponding kappa and percentual diagnostic agreements between the synthesized and target 12-lead ECGs are 0.88 (95%) and 0.83 (92%), respectively. The evaluation additionally shows that the personalization of the transformations has more impact on the quality of the synthesized ECGs than the personalization of the WEs' positions.

  • 124.
    Tomasic, Ivan
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Khosraviani, K.
    CNet Svenska AB, Stockholm, Sweden.
    Rosengren, P.
    CNet Svenska AB, Stockholm, Sweden.
    Jornten-Karlsson, M.
    AstraZeneca R and D, Gothenburg, Sweden.
    Lindén, Maria
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Enabling IoT based monitoring of patients' environmental parameters: Experiences from using OpenMote with OpenWSN and Contiki-NG2018Inngår i: 2018 41st International Convention on Information and Communication Technology, Electronics and Microelectronics, MIPRO 2018 - Proceedings, 2018, s. 330-334Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Remote health monitoring can be leveraged by the IoT paradigm. We tested OpenMotes, state-of-the-art IoT devices featuring IEEE 802.15.4 protocol, with Contiki-NG and OpenWSN, two of the most popular IoT operating systems, for the purpose of obtaining data from the OpenMote's sensors. The procedure is not strait forward and requires additional programing of the operating systems. All the steps necessary to make the OpenMote work with Contiki-NG are presented in detail. We also describe how to use Copper Firefox add-on to access the sensors data over CoAP, as well as how to design a functional web interface in Node-RED for the sensors data. 

  • 125.
    Tomasic, Ivan
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Petrovic, Nikola
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Fotouhi, Hossein
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Björkman, Mats
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Lindén, Maria
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    IoT enabled monitoring of patients’ environmental parameters supported by OpenWSN, OpenMote, and relational databases2018Inngår i: Medicinteknikdagarna 2018 MTD 2018, 2018Konferansepaper (Fagfellevurdert)
  • 126.
    Tomasic, Ivan
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Petrovic, Nikola
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Fotouhi, Hossein
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Lindén, Maria
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Björkman, Mats
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Data flow and collection for remote patients monitoring: From wireless sensors through a relational database to a web interface in real time2017Inngår i: IFMBE Proceedings, Springer Verlag , 2017, s. 89-92Konferansepaper (Fagfellevurdert)
    Abstract [en]

    A reliable, secure, and real-time data collection from sensor devices to the end-user is an open research problem. Many research works have been focusing on the wireless communication level to obtain quality of service. This paper widens the problem, and provides a comprehensive system design, where it covers all the elements in a remote health monitoring application. The system collects measurements in a relational database, either through a C#.NET or a LabVIEW program. The end-user is able to observe either real-time data (i.e. with insignificant delay) or processed historical data on any web browser. We have shown that the inclusion of the relational database may impose a need for the data to be buffered before inserting into the database within a single transaction, but the buffering does not entail delays bigger than 50 ms. 

  • 127.
    Tomasic, Ivan
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Petrovic, Nikola
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Lindén, Maria
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Rashkovska, A.
    Jolef Stefan Inst, Dept Inst Commun Syst, Ljubljana, Slovenia..
    Comparison of publicly available beat detection algorithms performanances on the ECGs obtained by a patch ECG device2019Inngår i: 2019 42ND INTERNATIONAL CONVENTION ON INFORMATION AND COMMUNICATION TECHNOLOGY, ELECTRONICS AND MICROELECTRONICS (MIPRO) / [ed] Koricic, M Butkovic, Z Skala, K Car, Z CicinSain, M Babic, S Sruk, V Skvorc, D Ribaric, S Gros, S Vrdoljak, B Mauher, M Tijan, E Pale, P Huljenic, D Grbac, TG Janjic, M, IEEE , 2019, s. 275-278Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Eight ECG beat detection algorithms, from the PhysioNet's WFDR and Cardiovascular Signal toolboxes, were tested on twenty measurements, obtained by the Savvy patch ECG device, for their accuracy in beat detection. On each subject, one measurement is obtained while sitting and one while running. Each measurement lasted from thirty seconds to one minute. The measurements obtained while running were more challenging for all the algorithms, as most of them almost perfectly detected all the beats on the measurements obtained in sitting position. However, when applied on the measurements obtained while running, all the algorithms have performed with decreased accuracy. Considering overall percentage of the faulty detected peaks, the four best algorithms were jqrs, from the Cardiovascular Signal Toolbox, and ecgpuwave, gqrs, and wqrs, from the WEDB Toolbox, with percentages of faulty detected beats 1.7, 2.3, 2.9, and 3, respectively.

  • 128.
    Tomasic, Ivan
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Petrovic, Nikola
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Lindén, Maria
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Rashkovska, A.
    Jožef Stefan Institute, Department of Communication Systems, Ljubljana, Slovenia.
    Comparison of publicly available beat detection algorithms performances on the ECGs obtained by a patch ECG device2019Inngår i: 2019 42nd International Convention on Information and Communication Technology, Electronics and Microelectronics, MIPRO 2019 - Proceedings, Institute of Electrical and Electronics Engineers Inc. , 2019, s. 275-278Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Eight ECG beat detection algorithms, from the PhysioNet's WFDB and Cardiovascular Signal toolboxes, were tested on twenty measurements, obtained by the Savvy patch ECG device, for their accuracy in beat detection. On each subject, one measurement is obtained while sitting and one while running. Each measurement lasted from thirty seconds to one minute. The measurements obtained while running were more challenging for all the algorithms, as most of them almost perfectly detected all the beats on the measurements obtained in sitting position. However, when applied on the measurements obtained while running, all the algorithms have performed with decreased accuracy. Considering overall percentage of the faulty detected peaks, the four best algorithms were jqrs, from the Cardiovascular Signal Toolbox, and ecgpuwave, gqrs, and wqrs, from the WFDB Toolbox, with percentages of faulty detected beats 1.7, 2.3, 2.9, and 3, respectively. 

  • 129.
    Tomasic, Ivan
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system. Lund University, Sweden.
    Tomasic, Nikica
    Lund University, Sweden.
    Trobec, Roman
    Jozef Stefan Inst, Dept Commun Syst, Ljubljana, Slovenia..
    Krpan, Miroslav
    Univ Hosp Ctr, Dept Cardiol, Zagreb, Croatia..
    Kelava, Tomislav
    Univ Zagreb, Sch Med, Dept Physiol, Zagreb, Croatia..
    Continuous remote monitoring of COPD patients-justification and explanation of the requirements and a survey of the available technologies2018Inngår i: Medical and Biological Engineering and Computing, ISSN 0140-0118, E-ISSN 1741-0444, Vol. 56, nr 4, s. 547-569Artikkel, forskningsoversikt (Fagfellevurdert)
    Abstract [en]

    Remote patient monitoring should reduce mortality rates, improve care, and reduce costs. We present an overview of the available technologies for the remote monitoring of chronic obstructive pulmonary disease (COPD) patients, together with the most important medical information regarding COPD in a language that is adapted for engineers. Our aim is to bridge the gap between the technical and medical worlds and to facilitate and motivate future research in the field. We also present a justification, motivation, and explanation of how to monitor the most important parameters for COPD patients, together with pointers for the challenges that remain. Additionally, we propose and justify the importance of electrocardiograms (ECGs) and the arterial carbon dioxide partial pressure (PaCO2) as two crucial physiological parameters that have not been used so far to any great extent in the monitoring of COPD patients. We cover four possibilities for the remote monitoring of COPD patients: continuous monitoring during normal daily activities for the prediction and early detection of exacerbations and life-threatening events, monitoring during the home treatment of mild exacerbations, monitoring oxygen therapy applications, and monitoring exercise. We also present and discuss the current approaches to decision support at remote locations and list the normal and pathological values/ranges for all the relevant physiological parameters. The paper concludes with our insights into the future developments and remaining challenges for improvements to continuous remote monitoring systems.

  • 130.
    Tomasic, Ivan
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Trobec, R.
    Department of Communication Systems, Jožef Stefan Institute, Ljubljana, Slovenia.
    Lindén, Maria
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Can the regression trees be used to model relation between ECG leads?2016Inngår i: Lecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering, LNICST, 2016, Vol. 169, s. 467-472Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Presented is a preliminary study that investigates regression trees application for the purpose of mapping relationship between three differential ECG leads and leads of the 12-lead ECG. The approach was evaluated on a single ECG measurement on which it was superior to two syntheses performed by universal and personalized linear transformations, in terms of correlation coefficients between the synthesized and measured leads. A prominent imperfection however is that the regression trees can output only a limited number of values equal to the number of leaf nodes. The paper indicates some ideas on how to overcome this deficiency.

  • 131.
    Tournier, P-H
    et al.
    Univ Paris Diderot SPC, Sorbonne Univ, Lab Jacques Louis Lions, CNRS,Inria,Equipe Alpines, F-75005 Paris, France..
    Aliferis, I
    Univ Cote dAzur, CNRS, LEAT, Nice, France..
    Bonazzoli, M.
    Ecole Polytech, CMAP, INRIA Saclay Ile France, Palaiseau, France..
    de Buhan, M.
    Univ Paris 05, Sorbonne Paris Cite, UMR CNRS 8145, MAP5, Paris, France..
    Darbas, M.
    Univ Picardie Jules Verne, UMR CNRS 7352, LAMFA, Amiens, France..
    Dolean, V
    Univ Cote dAzur, CNRS, LJAD, Nice, France.;Univ Strathclyde, Dept Maths & Stats, Glasgow, Lanark, Scotland..
    Hecht, E.
    Univ Paris Diderot SPC, Sorbonne Univ, Lab Jacques Louis Lions, CNRS,Inria,Equipe Alpines, F-75005 Paris, France..
    Jolivet, P.
    IRIT, UMR CNRS, F-5505 Toulouse, France..
    El Kanfoud, I
    Univ Cote dAzur, CNRS, LEAT, Nice, France..
    Migliaccio, C.
    Univ Cote dAzur, CNRS, LEAT, Nice, France..
    Nataf, F.
    Univ Paris Diderot SPC, Sorbonne Univ, Lab Jacques Louis Lions, CNRS,Inria,Equipe Alpines, F-75005 Paris, France..
    Pichot, Christian
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system. Univ Cote dAzur, CNRS, LEAT, Nice, France.
    Semenov, S.
    EMTensor GmbH, TechGate, A-1220 Vienna, Austria..
    Microwave tomographic imaging of cerebrovascular accidents by using high-performance computing2019Inngår i: Parallel Computing, ISSN 0167-8191, E-ISSN 1872-7336, Vol. 85, s. 88-97Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The motivation of this work is the detection of cerebrovascular accidents by microwave tomographic imaging. This requires the solution of an inverse problem relying on a minimization algorithm (for example, gradient-based), where successive iterations consist in repeated solutions of a direct problem. The reconstruction algorithm is extremely computationally intensive and makes use of efficient parallel algorithms and high-performance computing. The feasibility of this type of imaging is conditioned on one hand by an accurate reconstruction of the material properties of the propagation medium and on the other hand by a considerable reduction in simulation time. Fulfilling these two requirements will enable a very rapid and accurate diagnosis. From the mathematical and numerical point of view, this means solving Maxwell's equations in time-harmonic regime by appropriate domain decomposition methods, which are naturally adapted to parallel architectures. 

  • 132.
    Trobec, R.
    et al.
    Department of Communication Systems, Jožef Stefan Institute, Ljubljana, Slovenia.
    Jan, M.
    Department of Cardiovascular Surgery, University Medical Centre, Ljubljana, Slovenia.
    Lindén, Maria
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Tomasic, Ivan
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Detection and Treatment of Atrial Irregular Rhythm with Body Gadgets and 35-channel ECG2019Inngår i: 2019 42nd International Convention on Information and Communication Technology, Electronics and Microelectronics, MIPRO 2019 - Proceedings, Institute of Electrical and Electronics Engineers Inc. , 2019, s. 301-308Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The atrial irregular rhythm, often reflected in atrial fibrillation, undulation or flutter, is recognized as one of the major causes of brain stroke and entails an increased risk of thromboembolic events because it increases the likelihood of blood clots formation. Its early detection is becoming an increasingly important preventive measure. The paper presents a simple methodology for the detection of atrial irregular rhythm by ECG body gadget that can perform long-term measurements, e.g. several weeks or more. Multichannel ECG, on the body surface, gives a more detailed insight into the atrial activity in comparison to standard 12-lead ECG. The information from MECG is compared with single-channel patch ECG. The obtained results suggest that the proposed methodology could be useful in treatments of atrial irregular rhythm. One can obtain a reliable information about the time and duration of fibrillation events, or determine arrhythmic focuses and conductive pathways in heart atria, or study the effects of antiarrhythmic drugs on existing arrhythmias and on an eventual development of new types of arrhythmias. 

  • 133.
    Trobec, Roman
    et al.
    Jozef Stefan Inst, Jamova Cesta 39, Ljubljana 1000, Slovenia..
    Avbelj, Viktor
    Jozef Stefan Inst, Jamova Cesta 39, Ljubljana 1000, Slovenia..
    Stanic, Uros
    BRIS, Puhova Ul 10, Ljubljana 1000, Slovenia..
    Depolli, Matjaz
    Jozef Stefan Inst, Jamova Cesta 39, Ljubljana 1000, Slovenia..
    Rashkovska, Aleksandra
    Jozef Stefan Inst, Jamova Cesta 39, Ljubljana 1000, Slovenia..
    Tomasic, Ivan
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Kristofelc, Tomaz
    Jozef Stefan Inst, Jamova Cesta 39, Ljubljana 1000, Slovenia..
    Bregar, Klemen
    Jozef Stefan Inst, Jamova Cesta 39, Ljubljana 1000, Slovenia..
    Kosec, Gregor
    Jozef Stefan Inst, Jamova Cesta 39, Ljubljana 1000, Slovenia..
    System for Mobile Monitoring of Vital Functions and Environmental Context2017Inngår i: BIOSENSORS 2016 / [ed] Turner, A Tang, A, ELSEVIER SCIENCE BV , 2017, s. 157-158Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The use of ICT in the health care system is aimed to increase efficacy and decrease costs. We have designed a system and services for mobile monitoring of vital physiological parameters and environmental context. The system is based on a small multi-functional wireless body sensor for simultaneous measurement of ECG, temperature, heart rate, respiration rate, and movement. The sensor is wirelessly connected through Bluetooth Smart to a Smartphone. When necessary, the measurements are transferred to a server and can be accessed by authorized personnel. The contribution of the system to improved quality and efficiency of medical care is validated and estimated through several pilot studies.

  • 134.
    Trobec, Roman
    et al.
    Jožef Stefan Institute, Ljubljana, Slovenia.
    Tomasic, Ivan
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Rashkovska, Aleksandra
    Jožef Stefan Institute, Ljubljana, Slovenia.
    Depolli, Matjaž
    Jožef Stefan Institute, Ljubljana, Slovenia.
    Avbelj, Viktor
    Jožef Stefan Institute, Ljubljana, Slovenia.
    Body Sensors and Electrocardiography2017Bok (Annet vitenskapelig)
  • 135.
    Vahabi, Maryam
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Heterogeneous network for health monitoring applications2017Inngår i: Medicinteknikdagarna 2017 MTD 2017, 2017Konferansepaper (Fagfellevurdert)
  • 136.
    Vahabi, Maryam
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Fotouhi, Hossein
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Björkman, Mats
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Lindén, Maria
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Evaluating a Remote Health Monitoring Application Powered by Bluetooth2019Inngår i: 11th International Conference on e-Health e-Health'19, 2019, s. 67-74-Konferansepaper (Fagfellevurdert)
    Abstract [en]

    It has become widely accepted that the Internet of Things (IoT) devices and technologies are the key enablers for many emerging applications including remote health monitoring. Various physiological sensing devices have been designed and equipped with different radio technologies. The choice of radio hardware plays an important role on the overall performance of the system since it imposes some limitations on the delivered quality of service. Hence, it is critical to properly evaluate the embedded radio technology based on the application requirements. In this paper, we perform extensive experiments on Shimmer physiological sensors that is one of the leading providers of wearable wireless sensor products powered by Bluetooth classic radio. Shimmer sensors are designed and used for monitoring various human health information such as temperature, heart rate, movement, etc. We review and investigate different scenarios in which Shimmer devices are used by medical practitioners to monitor the ECG signal and the movement of a human. This study shows that the Shimmer device can provide reliable data delivery by using a specific configuration. For instance, employing a maximum number of seven Shimmer devices attached on a body at home environment within the range of at most 5 m and with the sampling rate of 512 Hz would result in a reasonable quality of service, while varying these parameters may degrade the overall performance. Mobility of human body, noisy environment, and higher packet transmission rates are some examples that will reduce the system quality. © Copyright 2019 IADIS Press All rights reserved.

  • 137.
    WEYUKER, ELAINE
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Individual working memory capacity traced from multivariate pattern classification of EEG spectral power2018Inngår i: Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS, Institute of Electrical and Electronics Engineers Inc. , 2018, s. 4812-4815Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Working Memory (WM) processing is central for human cognitive behavior. Using neurofeedback training to enhance the individual WM capacity is a promising technique but requires careful consideration when choosing the feedback signal. Feedback in terms of univariate spectral power (specifically theta and alpha power) has yielded questionable behavioral effects. However, a promising new direction for WM neurofeedback training is by using a measure of WM that is extracted by multivariate pattern classification. This study recorded EEG oscillatory activity from 15 healthy participants while they were engaged in the n-back task, n[1,2]. Univariate measures of the theta, alpha, and theta-over-alpha power ratio and a measure of WM extracted from multivariate pattern classification (of n-back task load conditions) was compared in relation to individual n-back task performance. Results show that classification performance is positively correlated to individual 2-back task performance while theta, alpha and thetaover-alpha power ratio is not. These results suggest that the discriminability of multivariate EEG oscillatory patterns between two WM load conditions reflects individual WM capacity. 

  • 138.
    Xi, X.
    et al.
    Academy of Chinese Energy Strategy, China University of Petroleum(Beijing), Beijing 102249, China.
    Li, Hailong
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Wallin, Fredrik
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Avelin, Anders
    Mälardalens högskola, Akademin för ekonomi, samhälle och teknik, Framtidens energi.
    Yang, X.
    Academy of Chinese Energy Strategy, China University of Petroleum(Beijing), Beijing 102249, China.
    Yu, Z.
    Department of Energy and Petroleum Engineering, University of Stavanger, Stavanger 4036, Norway.
    Air pollution related externality of district heating - A case study of Changping, Beijing2019Inngår i: Energy Procedia, Elsevier Ltd , 2019, s. 4323-4330Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Air pollution, caused by the use of fossil fuel, has been an environmental plague in China. It has a strong negative impact on human health. Since the costs of damage to health are not born by the pollution producers, these costs translate to social externality. Policies have an important role in optimizing resource allocation, such as penalizing the pollutant producers and incentivizing clean energy development. Among others, replacing coal with natural gas for heating represents an important example of air quality improvement measures. This paper presents a study that evaluates the health impacts from air pollution and the external cost of the "Coal-To-Gas" policy in district heating using Changping District (Beijing, China) as an example. Four scenarios were considered based on the historical and standard PM2.5 concentration. Results show that PM2.5 is responsible for causing an increase of 40% premature deaths in 2015 and that the monetary value of damage to health is higher than 1.2 billion CNY. In 2016 and 2017, the reported air quality was better than that in 2015. As a result, 13.3% and 26% premature deaths caused by air pollution were avoided in 2016 and 2017 compared to 2015 respectively. If the PM2.5 concentration level were to be reduced to national standard, the number of premature deaths attributed to PM2.5 could further decrease to 47.7% compared to 2015. Overall, the Coal-To-Gas policy in district heating reduces 0.017%~0.45% of premature death caused by air pollution each year. Air pollution reduction policies, which are expected to improve air quality together in the future, and the specific policy of Coal-To-Gas in district heating, could make great contribution to reducing the premature death caused by environmental problem and need more attention from the government and the public.

  • 139.
    Åkerberg, Anna
    Mälardalens högskola, Akademin för hälsa, vård och välfärd. Mälardalens högskola, Akademin för innovation, design och teknik.
    An interactive health technology solution for encouraging physical activity: a first model based on a user perspective2018Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    Globally, the level of physical inactivity is increasing. The overall aim of this thesis was to develop and test a first model of an interactive health technology solution (called App&Move) that should encourage physically inactive adults to be more physically active. App&Move was iteratively developed based on the user perspective, a so-called user-centered design. First, available technology was assessed; the validity and reliability of one smartphone pedometer application and one commonly used traditional pedometer were investigated. It was found that none of the investigated pedometers could measure correctly in all investigated situations. However, measurements by a smartphone appli-cation was identified to have high potential when aimed at monitoring physical activity in everyday situations. As the next step, a questionnaire was developed and distributed in central Sweden. The 107 respondents who answered the questionnaire were divided and analyzed in groups of users and non-users of physical activity self-monitoring technology. The results showed that users and non-users of such technology mainly had similar opinions about desirable functions of the technology. To gain further knowledge concerning how to design App&Move, the target group physically inactive non-users participated in focus group interviews. Important results were that the technology should focus on encouragement rather than measurements and that it preferably should be integrated into already existing technology, if possible already owned and worn by the person. A brainstorming workshop confirmed that the smartphone was a suitable platform, and a decision to develop a smartphone application was taken. A first draft of App&Move was developed, focusing on encouragement and measuring everyday activity and exercise in minutes per day. App&Move was based on available physical activity recommendations and strategies for successful behavior change. App&Move was positively received in a user workshop and thereafter iteratively refined and developed based on further user input. App&Move was usability tested in 23 physically inactive adults who used App&Move for four weeks and answered two questionnaires. Three usability aspects, effectiveness, efficiency and satisfaction, were assessed as follows: acceptable, high and medium, and slight increases in activity minutes were observed during the test period. To conclude, this thesis has investigated the user perspective of physical activity self-monitoring technology with a target group of physically inactive adults. Based on these findings, a behavior change application for smartphone, App&Move, was presented. The usability test indicated promising results with respect to usability and indicated an ability to encourage the users to physical activity to some extent.

  • 140.
    Åkerberg, Anna
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Hellstrom, Per Anders Rickard, Per
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Folke, Mia
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Steps measured in relation to different amount of physical activity2015Inngår i: 4th International Conference on Ambulatory Monitoring of Physical Activity and Movement ICAMPAM 2015, 2015Konferansepaper (Fagfellevurdert)
  • 141.
    Åkerberg, Anna
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Koshmak, Gregory
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Johansson, A.
    Linköping University, Linköping, Sweden.
    Lindén, Maria
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Heart rate measurement as a tool to quantify sedentary behavior2015Inngår i: Studies in Health Technology and Informatics, vol. 211, 2015, s. 105-110Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Sedentary work is very common today. The aim of this pilot study was to attempt to differentiate between typical work situations and to investigate the possibility to break sedentary behavior, based on physiological measurement among office workers. Ten test persons used one heart rate based activity monitor (Linkura), one pulse oximeter device (Wrist) and one movement based activity wristband (Fitbit Flex), in different working situations. The results showed that both heart rate devices, Linkura and Wrist, were able to detect differences in heart rate between the different working situations (resting, sitting, standing, slow walk and medium fast walk). The movement based device, Fitbit Flex, was only able to separate differences in steps between slow walk and medium fast walk. It can be concluded that heart rate measurement is a promising tool for quantifying and separating different working situations, such as sitting, standing and walking. 

  • 142.
    Åkerberg, Anna
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Lindén, Maria
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    The relevence of the user perspective in a project within health technology2017Inngår i: Medicinteknikdagarna 2017 MTD 2017, 2017Konferansepaper (Fagfellevurdert)
  • 143.
    Åkerberg, Anna
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Söderlund, Anne
    Mälardalens högskola, Akademin för hälsa, vård och välfärd, Hälsa och välfärd.
    Lindén, Maria
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Evaluation of a Selected Pedometer Cell Phone Application for iPhone2014Inngår i: International conference on health and social welfare and coproduction HW2014, 2014Konferansepaper (Fagfellevurdert)
  • 144.
    Åkerberg, Anna
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Söderlund, Anne
    Mälardalens högskola, Akademin för hälsa, vård och välfärd, Hälsa och välfärd.
    Lindén, Maria
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    The development and usability evaluation of an interactive health technology solution for the encouragement of physical activity in inactive adults - based on the user perspectiveManuskript (preprint) (Annet vitenskapelig)
    Abstract [en]

    Physical inactivity is increasing worldwide. Technology shows good evidence forhaving a good impact on health. Successful behaviour change regarding physical activity requires user involvement and the integration of relevant behaviour change techniques into the technology. The aim of this study was, based on the user perspective, to develop and later evaluate the usability of an interactive health technology solution that can encourage physically inactive adults to physical activity. A mixed methods design with a user-centred approach was used. The data collection included a brainstorming workshop, a user workshop, technical development and a usability evaluation (effectiveness, efficiency, satisfaction) involving 35 participants. From the brainstorming workshop, four themes were identified: focus, platform, characteristics and content. A schematic model of a first prototype was presented at the user workshop, and the feedback was positive. A behaviour change application was developed (App&Move), with a focus on encouraging functions. App&Move, which measures physical activity in minutes per day, has integrated behaviour change techniques, is based on available physical activity recommendations, relies on scientific evidence and is strongly based on the user perspective. The usability evaluation of App&Move showed that effectiveness was acceptable, efficiency was (with one exception) high, and satisfaction was medium. The results from this study contributes to the development of a first model of a behaviour change application that aims to encourage physically inactive adults to physical activity. In conclusion, the usability evaluation of App&Move showed promising usability, and the application seemed to encourage physical activity to some extent.

  • 145.
    Åkerberg, Anna
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Söderlund, Anne
    Mälardalens högskola, Akademin för hälsa, vård och välfärd, Hälsa och välfärd.
    Lindén, Maria
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Utvärdering av en stegräknarapplikation; mätnoggrannhet i olika mätmiljöer och positioner2014Inngår i: Medicinteknikdagarna 2014 MTD10, 2014Konferansepaper (Fagfellevurdert)
  • 146.
    Åkerberg, Anna
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Söderlund, Anne
    Mälardalens högskola, Akademin för hälsa, vård och välfärd, Hälsa och välfärd.
    Åkerlind, Charlotta
    Mälardalens högskola, Akademin för hälsa, vård och välfärd, Hälsa och välfärd.
    Lindén, Maria
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    How can technology promote physical activity? Opinions from physically inactive non-users of self-monitoring technologiesManuskript (preprint) (Annet vitenskapelig)
    Abstract [en]

    BACKGROUND: To achieve a more physically active and healthier population, the opinions of potential future users of physical activity self-monitoring technologies need further investigation. Therefore, the aim of this study was to investigate the opinions of physically inactive non-users of physical activity self-monitoring technologies, regarding how and when technology possibly could measure and encourage physical activity. METHODS: Two focus group interviews were performed, consisting of 11 physically inactive persons who had no previous experience with regular use of physical activity self-monitoring technology. The focus groups were analyzed by qualitative content analysis. RESULTS: The transcripts of the two focus groups resulted in 17 subcategories and five categories, which formed two themes: measurement complexity and performance and basic qualities. CONCLUSION: This study showed that the physically inactive non-users of physical activity self-monitoring technologies had positive, innovative and mainly similar opinions about how technology could promote physical activity. Since the concept of encouragement permeates the results, it can be concluded that the physical activity technology for this particular target group should primarily be based on encouraging features and functions. Further, the study indicated that it is preferable to integrate physical activity self-monitoring technology into already existing technology that the user already owns.

  • 147.
    Åkerberg, Johan
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Björkman, Mats
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Lindén, Maria
    Mälardalens högskola, Akademin för innovation, design och teknik.
    Safety and Security Experiences from Process Automation Applied to Healthcare and Medical Applications2009Konferansepaper (Fagfellevurdert)
  • 148.
    Çürüklü, Baran
    et al.
    Mälardalens högskola, Institutionen för datavetenskap och elektronik.
    Lansner, Anders
    Mälardalens högskola, Institutionen för datavetenskap och elektronik.
    On the development and functional roles of the layer 4 horizontal connections in the primary visual cortex2006Konferansepaper (Fagfellevurdert)
  • 149.
    Ödman, Torbjörn
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Wireless measurement systems for health and safety2015Licentiatavhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    This licentiate thesis presents an advanced wireless system, built on a single hardware platform, for applications in medicine and health. In order to design a single system, adaptable for different context, an accurate system specification is required.

    The technical requirements are authenticated by actual tests in the environment where the system is intended to be used. The results of these measurements give an understanding of the possibilities of designing a real system but also acts as a base for deriving the empirical formulas to be used as the basis of the development and verification.

    In summary, this work has included a larger measurement campaign and a verification of subsystems to support the development of wireless systems on a single hardware platform. This can be used for different measurements in medical healthcare and rescue work.

    Previous systems for endurance tests have limitations in that they are not adapted to different sizes of mammals and they also have shortcomings in the quantification of data and scalability.

    The developed system was validated on mice and humans. On mice the measurement parameters was the hormone dopamine and locomotion. For humans it was measured time for given distances. Both validation tests showed high correlation with the respective reference methods. The correlation coefficients of mice between the developed system and the former system ranged from 0.916 to 0.967. In the validation with humans, runners were clocked by the system clock and a manual stop watch. The lowest correlation coefficient was 0.864. Advantages with the developed system is that it is scalable and measures the activity level quantitatively in the unit meters and it can also be used for different sizes of mammals in different environments.

    In tracking devices for rescue it is important that the transmitted signal can be detected at distances as large as possible. A support in the design work is to simulate path loss. This requires a path loss exponent, which was calculated after the measurement campaign. The results showed that the exponent of the height dependency decreases with antenna height above water. For the frequency 200 MHz, the exponent for the antenna height is 0.4 (vertical polarization) and 1.5 (horizontal polarization). For the distance dependency, the exponent was 3.59 (vertical polarization) and 3.22 (horizontal polarization). The path loss exponent is 2 for both the free space- and the ground reflection model.

    An antenna’s physical dimension is to a large extent dependent on the lowest frequency. The research’s aim was to reduce the physical size by introducing a resonance frequency. The physical length was from the beginning 0.43 meter given by the lowest frequency used (0.7 GHz) and the antenna was reduced in size to 0.22 meter. 

  • 150.
    Ödman, Torbjörn
    et al.
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system. Saab Electronic Defense Systems, Jönköping, Sweden .
    Lindén, Maria
    Mälardalens högskola, Akademin för innovation, design och teknik, Inbyggda system.
    Larsson, C.
    Lund University, Lund, Sweden. Saab Dynamics, Linköping, Sweden .
    Reflection/transmission study of two fabrics with microwave properties2014Inngår i: Stud. Health Technol. Informatics, 2014, s. 95-100Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In this study, the transmission and reflection of two conductive fabrics are investigated in the frequency range from 2 to 18 GHz. One of the fabrics is a non-woven polypyrrole, and the other consists of a polyethylene warp with steel threads in the weft. Reflection and transmission measurements are performed in order to characterize the electromagnetic properties of the materials. Reflection measurements are performed for two polarizations at normal, 0°, and 60° incident angles. Transmission measurements are also done for two polarization directions at normal incidence. The results show that the fabric with the steel filler reflects most of the incident radiation, and has very low transmission with some polarization dependence. The polypyrrole non-woven fabric, on the other hand, has reflection and transmission properties that show that it is absorbing the incident radiation. Wearable on-body sensors that in addition are comfortable to wear can be integrated in the textile of clothes. These sensors can e.g., be used to monitor health or analyze gait. The fabrics have the potential to be used in health applications when designing on-body sensors, e.g. for movement analysis.

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