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  • 151.
    Grönkvist, Mikael
    et al.
    KTH, School of Technology and Health (STH), Environmental Physiology.
    Bergsten, Eddie
    KTH, School of Technology and Health (STH), Environmental Physiology.
    Eiken, Ola
    KTH, School of Technology and Health (STH), Environmental Physiology.
    Loss of pressure in the anti-G system at high G-loads2011Conference paper (Refereed)
  • 152.
    Grönkvist, Mikael
    et al.
    KTH, School of Technology and Health (STH), Basic Science and Biomedicine, Environmental Physiology. KTH, School of Technology and Health (STH), Centres, Swedish Aerospace Physiology Centre, SAPC.
    Ciuha, U
    Mekjavic, IB
    Eiken, Ola
    KTH, School of Technology and Health (STH), Basic Science and Biomedicine, Environmental Physiology. KTH, School of Technology and Health (STH), Centres, Swedish Aerospace Physiology Centre, SAPC.
    Värmebelastning i helikopter vid simulerat ökenuppdrag2015Conference paper (Refereed)
  • 153.
    Grönkvist, Mikael
    et al.
    KTH, School of Technology and Health (STH), Basic Science and Biomedicine, Environmental Physiology. KTH, School of Technology and Health (STH), Centres, Swedish Aerospace Physiology Centre, SAPC.
    Keramidas, Michail
    KTH, School of Technology and Health (STH), Basic Science and Biomedicine, Environmental Physiology. KTH, School of Technology and Health (STH), Centres, Swedish Aerospace Physiology Centre, SAPC.
    Eiken, Ola
    KTH, School of Technology and Health (STH), Basic Science and Biomedicine, Environmental Physiology. KTH, School of Technology and Health (STH), Centres, Swedish Aerospace Physiology Centre, SAPC.
    Samverkan mellan anti-G-dräkt och övertryck i luftvägarna på cerebral syresättning vid långvarig G-belastning i huvud-fot riktning2015Conference paper (Refereed)
  • 154.
    Guha, Jaideep
    et al.
    KTH, School of Technology and Health (STH), Fluid and Climate Technology (closed 20090101).
    Holmberg, Sture
    KTH, School of Technology and Health (STH), Fluid and Climate Technology (closed 20090101).
    Effectivity of a Suction Cylinder as Ventilation Equipment2006Conference paper (Refereed)
    Abstract [en]

    This paper proposes to use free wind to create suction pressure within a ventilation duct without consuming commercial energy. Like an ejector pump it creates suction pressure placed above the ventilation exhaust, which is used to draw exhaust air from the ventilation system. Discussing the possibilities of this suction cylinder concept in ventilation system is the objective of this paper. Here, a mathematical model was deduced for a suction cylinder and through CFD (Computational Fluid Dynamic) technique result was simulated later compared with theoretical model. GAMBIT was used as a preprocessor and for processing FLUENT, a commercial CFD code, was used for the simulation. Preliminary result clearly shows the positive advantages of using a suction cylinder as ventilation equipment.

  • 155.
    Ha, Minkeun
    et al.
    KTH, School of Technology and Health (STH).
    Kim, Daeyoung
    On-demand Cache Placement Protocol for Content Delivery Sensor Networks2016In: 2017 INTERNATIONAL CONFERENCE ON COMPUTING, NETWORKING AND COMMUNICATIONS (ICNC), IEEE , 2016, p. 207-211Conference paper (Refereed)
    Abstract [en]

    A significant number of promising wireless sensor applications for the Internet of Things (IoT) are becoming a reality. Most of these applications require a variety of heterogeneous and geographical sensor data to be delivered to users such as mobile devices, vehicles, and cloud systems for big data analysis to extract maximum value from the physical world. Data caching of popular data items in a network can significantly improve efficiency and reliability of content delivery by contributing the reduction of data access delay, bandwidth usage, and packet losses in resource-limited low-rate wireless sensor networks. In this paper, we propose an efficient cache placement protocol (BCDA) that minimizes data access cost and guarantees cache consistency in a lightweight manner. The BCDA decides where to store a copy of data content in a network using a distributed approach according to clients' access patterns, memory capacity, data size, and so on. To evaluate the feasibility and effectiveness, we implemented the BCDA in ns-2 and compared its performance with existing caching strategies. The simulation results highlight that the BCDA significantly reduces data access cost with minimizing cache management cost.

  • 156.
    Ha, Minkeun
    et al.
    KTH, School of Technology and Health (STH).
    Lindh, Thomas
    KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
    Distributed Performance Management of Internet of Things as a Service for Caregivers2017Conference paper (Refereed)
    Abstract [en]

    This paper presents a multi-layer distributed performancemanagement model for Internet of Things (IoT) as aservice for caregivers. Performance monitoring and control ofIoT devices and services are vital functions for e-health systems.Cloud-based IoT systems with centralized data centers furtherunderline the need for distributed management. The main contributionof this paper is a model and prototype implementation thatcombines low-complexity policy-based and conventional networkmanagement with cloud computing paradigm, lightweight IoTprotocols, and their data models. A case study on monitoringof heart activity demonstrates interworking between OMALightweight M2M protocol, Bluetooth low energy GATT services,and Azure IoT hub cloud platform to enable distributed policybasedperformance management.

  • 157.
    Haasl, Sjoerd
    et al.
    KTH, School of Technology and Health (STH), Centres, Centre for Technology in Medicine and Health, CTMH.
    Persson, Katrin
    Johander, Per
    3D packaging concept for inertial sensors2006In: Proceedings Eurosensors XX, Göteborg, Sweden, 2006, Vol. I, p. 192-193Conference paper (Refereed)
  • 158. Hallberg, Sven-Erik
    et al.
    Gustafsson, Alf
    Johansson, Åke
    Thunqvist, Eva-Lotta
    KTH, School of Technology and Health (STH), Centres, Centre for Health and Building, CHB.
    Anti-Skid Treatment Tests with Glucose, Fructose and Unrefined Sugar2007In: / [ed] TRB, Washington: TRB , 2007Conference paper (Refereed)
    Abstract [en]

    Over the past ten years, salt consumption for de-icing treatment on Swedish roads has been halved from approximately 400,000 tons to some 200,000 tons per year. This is largely a result of preventive measures with salt solution, which entails significantly smaller salt doses than in the case of dry and moistened salt. The purpose of the investigation has been to conduct tests with a salt solution in combination with glucose/fructose/refined sugar in order to determine whether a certain amount of the salt solution can be replaced by a product containing these substances and the kind of technical and environmental effects the mixture would have. The introductory trials, which were performed on an airport landing strip 2004/2005 gave experience of value, regarding friction coefficients etc, to continued testing. Field tests have been carried out the winter season 2005/2006. The fact that salt will continue to play an important role in anti-freeze treatment is borne out by the testing. The investigation has shown that it is possible to use a mixture of the salt solution that is today used for anti-freeze treatment together with a glucose/fructose product and maintain safety friction conditions. Exactly how large the sugar solution is and its concentration should be further studied through continued airfield trials and as well as on a section of road used by traffic. The results from the recent season as using mixtures of 75% salt and 25% sugar as well as trials on 50/50 base, looks promising. The sugar part of the solution can not melt ice but delay freezing. The product should be looked upon as a complement to salt as it leads to a lower freezing-point of the solution. Friction measurements Cost The analysis does not contain any form of financial evaluation in year one as to the cost of the solution or the value of reduced salt attack on the vehicle fleet. Since the mixtures have been produced manually and on a small scale, practical handling of the mixtures on a larger scale is included in the investigation in the winter season 2005/2006. The products environmental impact on corrosion, concrete, animal life and plant life have been studied. Oxygen is consumed in the breakdown of glucose/fructose/unrefined sugar. The breaking down of glucose/fructose/unrifined sugar by micro-organisms is influenced by the presence of toxic substances such as metals and salts and should be studied both in the field and in the laboratory. Furthermore, the oxygen consumption in recipients should be studied.

  • 159.
    Halldin, Peter
    et al.
    KTH, School of Technology and Health (STH), Neuronic Engineering (Closed 20130701).
    Aare, Magnus
    KTH, School of Technology and Health (STH), Neuronic Engineering (Closed 20130701).
    Kleiven, Svein
    KTH, School of Technology and Health (STH), Neuronic Engineering (Closed 20130701).
    von Holst, Hans
    KTH, School of Technology and Health (STH), Neuronic Engineering (Closed 20130701).
    Improved helmet design and test methods to reduce rotational induced brain injuries2003Conference paper (Refereed)
  • 160.
    Halldin, Peter
    et al.
    KTH, School of Technology and Health (STH), Neuronic Engineering (Closed 20130701).
    Aare, Magnus
    KTH, School of Technology and Health (STH), Neuronic Engineering (Closed 20130701).
    Kleiven, Svein
    KTH, School of Technology and Health (STH), Neuronic Engineering (Closed 20130701).
    von Holst, Hans
    KTH, School of Technology and Health (STH), Neuronic Engineering (Closed 20130701).
    Reduced risk for DAI by use of a new safety helmet2003Conference paper (Refereed)
  • 161.
    Halldin, Peter
    et al.
    KTH, School of Technology and Health (STH), Neuronic Engineering.
    Kleiven, Svein
    KTH, School of Technology and Health (STH), Neuronic Engineering.
    Improved helmet design and test methods to reduce rotational induced brain injuries2009Conference paper (Other (popular science, discussion, etc.))
  • 162. Halvarsson, Agneta
    et al.
    Svensson, L
    Brännmark, Mikael
    KTH, School of Technology and Health (STH), Health Systems Engineering, Ergonomics.
    Eklund, Jörgen
    KTH, School of Technology and Health (STH), Health Systems Engineering, Ergonomics.
    Kock, H
    Lindskog, Pernilla
    KTH, School of Technology and Health (STH), Health Systems Engineering, Ergonomics.
    Lean production: an institutional and organizational perspective on two national programs2013Conference paper (Refereed)
  • 163.
    Halvorsen, Kjartan
    et al.
    KTH, School of Technology and Health (STH), Medical sensors, signals and systems (MSSS).
    Brechbühl, Simon
    ETH Zurich, Switzerland.
    Minimal set of markers for center of mass estimation in gravitational fall2009In: Proceedings of the ISB XXII Congress, 2009Conference paper (Refereed)
  • 164.
    Halvorsen, Kjartan
    et al.
    KTH, School of Technology and Health (STH), Medical sensors, signals and systems (MSSS).
    Eriksson, Martin
    KTH, School of Technology and Health (STH), Medical sensors, signals and systems (MSSS).
    Nilsson, Johnny
    The Swedish School of Sport and Health Sciences.
    Tinmark, Fredrik
    The Swedish School of Sport and Health Sciences.
    Gullstrand, Lennart
    The Swedish Sport Confederation.
    The antero-posterior movement of the sacrum as an indicator of the antero-posterior movement of center of mass in running2011In: Proceedings of ECSS 16th Congress, 2011Conference paper (Refereed)
  • 165.
    Hamid Muhammed, Hamed
    KTH, School of Technology and Health (STH), Health Systems Engineering.
    Image Enhancement And Reduction Of Radiation Dose For Panoramic Dental X-Ray Imaging2013In: Swedish Medical Engineering Conference 2013, Medicinteknikdagarna 2013, 2013Conference paper (Other academic)
    Abstract [en]

    1.  Background Reducing the X-ray dose too much produces images with low quality; Noisy, blurred, faded, under exposed. The approach used in this work aims at enhancing image quality by using advanced  automatic image processing algorithms.

    2.  Purpose To minimize X-ray dose exposure during panoramic dental X-ray imaging, in addition to automatically enhancing the acquired X-ray images to achieve high quality images that can be viewed using ordinary monitors.

    3.  Method An automatic, adaptive image enhancement algorithm was developed and implemented on multi-core CPU as well as GPU to achieve real time performance.

    4.  ResultsThe method was tested on panoramic dental X-ray images acquired with varying radiation dose. The results were promising and indicated the possibility of obtaining diagnostically usable images using a reduced dose by 50%. A group of ten dentists and specialists evaluated the resulted images. Figure (1) shows a comparison between an enhanced panoramic dental X-ray acquired with reduced dose by 50% and an original (unprocessed) panoramic dental X-ray acquired with a standard dose.

    5.  Discussion and conclusionsThis study shows the possibility to achieve a number of goals that can lead to better patient safety and better healthcare in general, such as:Minimized X-ray dose to the patient, which can lead to reduced risk of physical damage (e.g. cancer) and psycological consequences (e.g. stress).Better image quality which can lead to better, faster and more accurate and confident diagnostic.The resulted enhanced images can be automatically produced without any noticeable waiting time and viewed using any ordinary monitor (LCD/LED TV or computer screens) without any need for any expensive/exclusive high-dynamic-range displays.

  • 166.
    Hamid Muhammed, Hamed
    KTH, School of Technology and Health (STH), Medical Engineering.
    Image Enhancement Combined with Reduction of X-Ray Dose During PCI-Operations2010Conference paper (Other academic)
  • 167.
    Hamid Muhammed, Hamed
    KTH, School of Technology and Health (STH), Health Systems Engineering, Systems Safety and Management.
    Optimization of radiation doses in panoramic X-ray examination using automated image processing2014In: IST 2014 - 2014 IEEE International Conference on Imaging Systems and Techniques, Proceedings, 2014, p. 361-364Conference paper (Refereed)
    Abstract [en]

    Radiological techniques based on X-rays are well established in medical diagnostics and there are known risks associated with the use of ionizing radiation like X-rays. That explains why the X-ray technology is constantly under development in the pursuit of new technologies that can contribute to reduce radiation dose to patients. Since the reduction of a radiation dose generally results in a poorer image quality, we have investigated whether the use of digital image processing can provide panoramic radiographs with enhanced image quality. An automated image processing algorithm was proposed and employed for this purpose. Panoramic X-ray examination is an important and common tool in dental radiology, used especially for children and teenagers. The technique is used to create an overview of a patient's jaw.

  • 168.
    Hamid Muhammed, Hamed
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering.
    Bergholm, Fredrik
    KTH, School of Technology and Health (STH), Medical Engineering.
    Camera-spectrometer for instantaneous multi- and hyperspectral imaging2005Conference paper (Other academic)
  • 169.
    Hamid Muhammed, Hamed
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering.
    Bergholm, Fredrik
    KTH, School of Technology and Health (STH), Medical Engineering.
    Camera-spectrometer for multi- and hyperspectral imaging2005Conference paper (Other academic)
  • 170.
    Hamid Muhammed, Hamed
    et al.
    KTH, School of Technology and Health (STH), Informatics, logistics and management (Closed 20130701).
    Kothapalli, Veeravenkata S
    KTH, School of Technology and Health (STH), Medical Engineering.
    Using Ultrasonic Spectrometry to Estimate the Stability of a Dental Implant Phantom2012Conference paper (Refereed)
  • 171.
    Hamid Muhammed, Hamed
    et al.
    KTH, School of Technology and Health (STH), Health Systems Engineering.
    Moustafa, A.N.
    KTH, School of Technology and Health (STH), Health Systems Engineering, Systems Safety and Management.
    Hassan, Moustapha
    Department of Laboratory Medicine, Karolinska University Hospital.
    Temperaturvariationsanalys för hudcancerscreening, Poster, Barncancerfondens tredje konferens2013In: Barncancerfondens tredje konferens: Medicinsk Teknik för Barn med Cancer, 2013Conference paper (Other academic)
    Abstract [sv]

    Den här studien visar att det är möjligt att detektera tydliga temperaturskillnader mellan cancervävnad och frisk vävnad. Detta kan vara ett resultat av både angiogenes (processen som leder till nybildning av blodkärl från de minsta befintliga blodkärl) och ökad ämnesomsättning hos cancerceller (medan cancertumörer formas) jämfört med friska normala celler, som ändrar och ökar intensiteten av den termiska IR-strålningen inom cancervävnads områden. Temperaturförändringarna detekterades genom mätningar av termisk IR-strålning inom våglängdsområdet 8-14 μm. Intensiva experiment utfördes på möss med hudcancer. Cancerområdet hade i genomsitt 0.3 – 0.5 °C högre temperatur än de friska grannområdena. Både kvalitativa och kvantitativa statistiska metoder användes för att analysera dessa mätningar. Analysresultaten verifierar användbarheten av att mäta termisk IR-strålning för att kunna detektera hudcancerområden.

  • 172.
    Hamid Muhammed, Hamed
    et al.
    KTH, School of Technology and Health (STH), Health Systems Engineering.
    Raghavendra, Jammalamadaka
    KTH, School of Technology and Health (STH).
    A New Approach for Rehabilitation and Upper-Limb Prosthesis Control Using Optomyography (OMG)2016In: THE 1ST 2016 INTERNATIONAL CONFERENCE ON BIOMEDICAL ENGINEERING (IBIOMED 2016), IEEE, 2016, p. 27-32Conference paper (Refereed)
    Abstract [en]

    Myoelectric (EMG) and mechano-myographic (MMG) signals recorded during muscular activities are useful not only for monitoring and assessing these activities but can also help in providing effective rehabilitation for disabled patients as well as constructing and controlling sophisticated prosthesis for various amputees. While the existing training methods using EMG and MMG signal data have compelling benefits, many engineering challenges still remain with regard to the sensory control system. Studies show that prosthesis' users support arguments considering the continued development of comfortable, reliable and better functionality of the sensors of the available applications. The aim of this paper is to study muscular activity by using an armband with embedded OptoMyoGraphy (OMG) sensors arranged as a one dimensional sensor array. The armband and the signals' acquisition system are designed and developed at the beginning of the research project. The used sensors are capable of measuring lateral dimensional changes, on the landscape formed by the skin surface, caused due to underlying muscles' activities around the forearm region. As a novel contribution, the paper discusses a possible methodology to control portable upper limb prosthetic devices using the OMG technique. Furthermore, the developed armband can be used as a biofeedback system for rehabilitation purposes in upper-limb amputees (ULAs) cases with below-the-forearm amputation and help them gain control over their remaining sensory-motor system and get rid of phantom and/or residual limb pain (PLP, RLP).

  • 173.
    Hamid Muhammed, Hamed
    et al.
    KTH, School of Technology and Health (STH), Health Systems Engineering.
    Raghavendra, Jammalamadaka
    KTH, School of Technology and Health (STH), Health Systems Engineering, Systems Safety and Management.
    Optomyography (OMG): A Novel Technique for the Detection of Muscle Surface Displacement Using Photoelectric Sensors2015In: Measurements - Proceedings of the 10th International Conference on Bioelectromagnetism, International Society for Bioelectromagnetism, 2015, Vol. 10Conference paper (Refereed)
    Abstract [en]

    Several techniques have been introduced for detecting, measuring, processing and analyzing the signals generated during muscular activities. With the development of more advanced technical solutions, the measurement and analysis of these signals help not only to understand the medical abnormalities and characterization of muscle activities but also to develop human machine interfaces of higher efficiency. In this work, a novel technique to detect and measure the displacement caused on the surface of the skin due to muscle activities was introduced and developed using near-infrared photoelectric sensors. The new technique was coined as OptoMyoGraphy (OMG). In order to evaluate the new technique, real-time pairs of signals were registered using two photoelectric sensors measuring near-infrared rays reflected on the forearm while moving the hand to make a number of different gestures. Different pairs of signals, changing over time and showing repeated patterns while repeating the same hand gesture, were measured for different hand gesture. The signal to noise ratio (SNR) of these signals was good enough to be able to differentiate among the pairs of signals which correspond to different hand gestures using visual inspection.

  • 174.
    Hauge, Jannicke
    et al.
    KTH. BIBA, Bremer Institut für Produktion und Logistik an der Universität Bremen, Germany.
    Carretero, Ramos Miguel
    KTH.
    Kodjabachian, J.
    Meijer, Sebastiaan
    KTH, School of Technology and Health (STH), Health Systems Engineering, Health Care Logistics.
    Raghothama, Jayanth
    KTH, School of Technology and Health (STH), Health Systems Engineering, Health Care Logistics.
    Duqueroie, B.
    Protoworld: a simulation based gaming environment to model and plan urban mobility2016In: 4th International Conference on Games and Learning Alliance, GALA 2015, Springer, 2016, p. 393-400Conference paper (Refereed)
    Abstract [en]

    This workshop will offer the participants the opportunity to explore and test a gaming environment integrating simulation data from different sources. The participants will model and play different mobility options for five European cities. The ProtoWorld solution integrates different simulations and street maps in Unity and allows a playful experience in urban mobility planning. The software will be available for the participants also after the workshop for further experimentation.

  • 175. Hedman, L.
    et al.
    Fahlstedt, Madelen
    KTH, School of Technology and Health (STH), Neuronic Engineering.
    Schlickum, M.
    Möller, H.
    Halldin, Peter
    KTH, School of Technology and Health (STH), Neuronic Engineering.
    Von Holst, Hans
    KTH, School of Technology and Health (STH), Neuronic Engineering.
    Felländer-Tsai, L.
    Training diagnosis and treatment of cervical spine trauma using a new educational program for visualization through imaging and simulation (VIS): A first evaluation by medical students2012In: Stud. Health Technol. Informatics, 2012, p. 171-174Conference paper (Refereed)
    Abstract [en]

    In this pilot study we investigated how medical students evaluated a VIS practice session. Immediately after training 43 students answered a questionnaire on the training session. They evaluated VIS as a good interactive scenario based educational tool.

  • 176. Helena, C. H.
    et al.
    Jelena, V. M.
    Nataša, R.
    Vito, F.
    Mekjavic, I. B.
    Eiken, Ola
    KTH, School of Technology and Health (STH), Basic Science and Biomedicine, Environmental Physiology.
    Robert, Z.
    A new approach to study properties of isolated preadipocytes following in vivo exposure to hypoxia2013In: Proceedings of Life in space for life on earth, 18-22 June 2012, Aberdeen, ESA Communications , 2013Conference paper (Refereed)
    Abstract [en]

    In the present study we developed a novel approach to study the properties of isolated human preadipocytes from subjects exposed to conditions of hypoxia equivalent to an altitude of 4000 m. By using confocal microscopy we studied the expression of dipeptidyl peptidase 4 (DPP4) in preadipocytes from adult normal-weight males. DPP4 is a transmembrane glycoprotein with enzymatic activity that cleaves Nterminal dipeptides from a diverse range of substrates. The activity of DPP4 is implicated in immune response as well as in glucose homeostasis. To gain insights into the pathophysiological role of DPP4 in insulin resistance we here explored DPP4 expression during prolonged exposure to hypoxia, an experimental model of obesity onset. We used here a rapid method to isolate cells from biopsies and immunolabelled them with antibodies. Then cells were prepared for the analysis with confocal microscopy. The results show that a prolonged exposure to hypoxic environment appears to increases the expression of DPP4 on preadipocytes.

  • 177. Hemphälä, H
    et al.
    Zetterberg, Camilla
    Lindberg, Per
    Heiden, Marina
    Nylén, Per
    KTH, School of Technology and Health (STH), Health Systems Engineering, Ergonomics.
    A method for assessing risks in visual ergonomics2015In: Proceedings of Nordic Ergonomics Society 47th Annual Conference, 2015Conference paper (Refereed)
    Abstract [en]

    A method for risk assessment in the field of visual ergonomics is under development. Insufficient visual ability can lead to increased workload and contribute to eyestrain and musculoskeletal discomfort. Although the relation between eyestrain and musculoskeletal discomfort is not fully understood, studies have shown that straining the eyes increases the musculoskeletal activity in the neck and shoulders (trapezius); associations between visually demanding work, eye problems, headaches and/or muscle problems have also been found (Aarås et al., 2001; IESNA, 2011; Zetterlund et al., 2009; Zetterberg et al., 2013; Toomingas et al., 2013; Richter et al., 2011; Richter et al., 2015). Problems due to insufficient visual ergonomics not only exist in computer intensive work, but in other professions as well, such as surgeons and postal workers (Hemphälä et al., 2011; Hemphälä et al., 2012). The aim of this project is to develop a practical, easy-to-use, and time efficient risk assessment method for visual ergonomics. With this method, risk factors in the visual environment can be detected, and interventions implemented to reduce the prevalence of symptoms related to poor visual ergonomics among workers.  

  • 178.
    Hemphälä, Hillevi
    et al.
    Ergonomics, Design Sciences, Lund University.
    Zetterberg, Camilla
    Centre for Musculoskeletal Research, university of Gävle.
    Lindberg, Per
    Centre for Musculoskeletal Research, university of Gävle.
    Nylén, Per
    KTH, School of Technology and Health (STH), Health Systems Engineering, Ergonomics.
    A method for assessing risks within visual ergonomics2014In: Human Factors in Organizational Design and Management -XI, 2014, p. 111-112Conference paper (Refereed)
  • 179.
    Hjalmarson, Jenny
    KTH, School of Technology and Health (STH), Centres, Centre for Health and Building, CHB.
    Risk of Injury during home care work2010In: On the Road to Vision Zero?: Workers with high risk exposure, 2010Conference paper (Other academic)
    Abstract [en]

    Old peoples’ homes and bathrooms are sometimes also a workplace for nurses. Statistics show that the risk of injury and long‐term sick‐leave is high in this occupation. In a case study, 30 nurses from the Home Care Services of Haninge council, Sweden, performed different work tasks associated with assisting someone with their personal hygiene in the bathroom. The tests were performed in the full-scale laboratory of the CHB, in a bathroom equipped with a wall-mounted toilet, height‐ adjustable and equipped with support rails. The participating nurses were wearing a measurement system CUELA (‘computer-assisted recording and long-term analysis of musculoskeletal loads’) which together with video recordings made it possible to analyse the risk postures occuring. Postures including back flexion and rotation were regularly involved in the hygiene assisting tasks, but one specific sub-task indicated a high risk of traumatic overexertion or fall on the part of the care worker. The subtask when the nurse is assisting a person with balance or strength problems standing in front of the toilet, helping to pull up or down the trousers, combined a forward bending posture often more than 50º, while rotated with their balance affected, and, at the same time, with the person cared for in a position which highly affected his or hers stability. The typical assistive device applied to toilets are foldable armrests on one or both sides of the toilet, but it was found that for this sub‐task they affected the nurses’ posture in a negative way. A new and better solution for assistive technology in this particular task is needed.

  • 180.
    Hjalmarson, Jenny
    et al.
    KTH, School of Technology and Health (STH), Centres, Centre for Health and Building, CHB.
    Svensson, Hanna
    KTH, School of Technology and Health (STH), Centres, Centre for Health and Building, CHB.
    Glimskär, Bo
    KTH, School of Technology and Health (STH), Centres, Centre for Health and Building, CHB.
    Accessibility for elderly using a four-wheeled walker-an interview and observation analysis2013In: AAATE Conference 2013, 2013, p. 27-33Conference paper (Refereed)
    Abstract [en]

    Accessibility for all is an overall goal in many communities around the world. The UN has the Convention on the Rights of Persons with Disabilities which Sweden along with many other countries has agreed to follow. The aim with this project was to analyse which environmental difficulties elderly people over 65 years of age experience in their daily life when walking with a four-wheeled walker. The focus area was the surroundings close to their home. It is necessary to learn more about the difficulties for people with disabilities as a base for future development of the built environment. The group of elderly is increasing daily. In Sweden the four-wheeled walker is a commonly used assistive device by the elderly when, for example, their balance decreases; this is why we chose to focus on this specific assistive device.

  • 181.
    Hjalmarsson, Håkan
    et al.
    KTH, School of Electrical Engineering (EES), Automatic Control.
    Lindqvist, Kristian
    KTH, School of Technology and Health (STH), Medical Engineering, Medical sensors, signals and systems.
    Identification of performance limitations in control2001In: 2001 European Control Conference, ECC 2001, IEEE conference proceedings, 2001, p. 1446-1451Conference paper (Refereed)
    Abstract [en]

    Non-minimum phase zeros and poles of a process put upper and lower constraints on the bandwidth of a closed loop system. It is thus of great interest to be able to identify these quantities. In this contribution it is shown that non-minimum phase zeros and unstable poles can be identified using high order models without the standard o(n) (n is the model order) variance penalty for over modeling. An asymptotic, in the model order and the number of data, expression for the variance of non-minimum phase zeros is derived. This result shows that the problem of determining the performance limits of a system from experimental data is considerably easier than identifying the complete system. As a direct application of this an optimal experiment design problem for identification of performance limits is posed and solved.

  • 182.
    Ho, Johnson
    et al.
    KTH, School of Technology and Health (STH), Neuronic Engineering.
    Kleiven, Svein
    KTH, School of Technology and Health (STH), Neuronic Engineering.
    Investigation of the Dynamic Response Contribution of Vasculature in a 3D Finite Element Head Model2006Conference paper (Other academic)
  • 183.
    Holmberg, Sture
    KTH, School of Technology and Health (STH), Fluid and Climate Technology (closed 20090101).
    Modelling of low-temperature heating systems in buildings2008In: World Renewable Energy Conference, WREC 2008, 2008Conference paper (Refereed)
  • 184.
    Holmberg, Sture
    KTH, School of Technology and Health (STH), Fluid and Climate Technology (closed 20090101).
    The influence of room air flow and turbulence on heat transfer from human body – a new comfort model consideration2008In: Indoor Air 2008, 11th International Conference on Indoor Air Quality and Climate, 2008Conference paper (Refereed)
  • 185.
    Ilskog, Elisabeth
    KTH, School of Technology and Health (STH), Centres, Centre for Health and Building, CHB.
    The Zanzibar blackout: A case study on consequences from an electricity power crisis2011In: 6th Dubrovnik Conference on Sustainable Development of Energy Water and Environment Systems, Stockholm: KTH STH , 2011Conference paper (Refereed)
    Abstract [en]

    AbstractAvailability of electricity in developing countries is by no doubt a tool for development.However, the development cannot be sustainable if necessary back-up facilities are not in place.This is argued and demonstrated in this paper, using the last 10 years of development in Zanzibar as a case. In Zanzibar, the demand for electricity has grown fast and the amount of billed electricity increased with more than 50 % from year 2003 to year 2007. The highest increase can be seen in the medium sized industries sector, where the tourism sector consisted of a large proportion.With increased dependency of electricity, the fundament for a more vulnerable society is also created. This is illustrated by the economic and social depression that hit Zanzibar during the breakdowns of the power system that occurred for one month in 2008 and for almost three months in 2009-2010. As there where no public back-up generation facility in Zanzibar, this resulted in a total electrical blackout and the citizens had to rely on private electricity generation. In the paper some examples of the consequences are given.

  • 186. Imrek, J.
    et al.
    Hegyesi, Gy.
    Kalinka, G.
    Moinar, J.
    Novák, D.
    Valastyán, I.
    Balkay, L.
    Emri, M.
    Opposits, G.
    Kis, S. A.
    Trón, L.
    Bükki, T.
    Szabó, Zs.
    Kerek, Andras
    KTH, School of Technology and Health (STH), Medical Engineering.
    Internals and evaluation of the miniPET-II detector module2007In: 2007 IEEE Nuclear Science Symposium Conference Record, 2007, p. 2930-2932Conference paper (Refereed)
    Abstract [en]

    We report on the architecture of the System-on-Module (SoM) developed by our group for miniPET-II, the second version of our small animal PET scanner. The paper describes the hardware and software implementation details of the SoM we realized inside the miniPET-II detector module, the embedded Linux operation system, and the the initial results of bandwidth test measurements on the assembled SoM. Detailed description is given on the interfacing of the updated miniPET IP Core to the SoM, on the efficient data transfer method that implements device-to-device DMA transfer, and on the usage of User Datagram Protocol (UDP/IP) for high speed data transfer.

  • 187. Imrek, J.
    et al.
    Hegyesi, Gy.
    Kalinka, G.
    Molnár, J.
    Novák, D.
    Valastyán, I.
    Végh, J.
    Balkay, L.
    Emri, M.
    Kis, S.
    Trón, L.
    Bükki, T.
    Szabó, Zs.
    Kerek, Andras
    KTH, School of Technology and Health (STH), Medical Engineering.
    Development of an improved detector module for miniPET-II2007In: 2006 IEEE Nuclear Science Symposium Conference Record, IEEE , 2007, p. 3037-3040Conference paper (Refereed)
    Abstract [en]

    We present a new detector module developed for miniPET-II, the second generation of the miniPET small animal PET scanners. The improved module features new hardware components for better performance: LySO crystal material, increased number of crystal segments, Hamamatsu H9500 PSPMT, Xilinx Virtex-4 FPGA and Gigabit Ethernet. However, the principle of operation is the same: no hardware coincidence detection is implemented, data is acquired in list mode and transfered over an Ethernet network. The resulting new module is more suitable for full ring configurations.

  • 188. Inganäs, Olle
    et al.
    Asplund, Maria
    KTH, School of Technology and Health (STH), Neuronic Engineering.
    Hamedi, Mahiar
    Forchheimer, Robert
    von Holst, Hans
    KTH, School of Technology and Health (STH), Neuronic Engineering.
    Neural Contacts with Conjugated Polymers in Fibre Geometries2007Conference paper (Refereed)
  • 189.
    Insanic, Jasmina
    et al.
    KTH.
    Rose, Linda M
    KTH, School of Technology and Health (STH).
    Österman, Cecilia
    Kalmar Maritime Academy, Linnaeus University.
    Expert user perspectives of the Ergo-Index model for analysis of work tasks2017In: NES2017 Conference Proceedings: JOY AT WORK / [ed] Anna-Lisa osvalder, Mikael Blomé, Hajnalka Bodnar, 2017Conference paper (Refereed)
    Abstract [en]

    The purpose of this study is to evaluate an updated beta version of Ergo-Index, a digital tool for ergonomic risk assessments. The evaluation was performed with 15 expert users who assessed type, distance, height and exposure time of certain work tasks, as well as the usability of the tool. In conclusion, the users find the present state of the Ergo-Index suitable as a first screening method. Assessments of lifting work have the greatest inter-rater reliability. Further development of the digitalized version of the tool is needed to improve accuracy assessing input regarding pushing and pulling work tasks, and to increase usability.

  • 190.
    Ioakeimidou, Foteini
    et al.
    KTH, School of Computer Science and Communication (CSC).
    Olwal, Alex
    KTH, School of Computer Science and Communication (CSC).
    Nordberg, Axel
    KTH, School of Technology and Health (STH), Neuronic Engineering.
    von Holst, Hans
    KTH, School of Technology and Health (STH), Neuronic Engineering.
    3D Visualization and Interaction with Spatiotemporal X-ray Data to Minimize Radiation in Image-guided Surgery2011In: 2011 24TH INTERNATIONAL SYMPOSIUM ON COMPUTER-BASED MEDICAL SYSTEMS (CBMS) / [ed] Olive, M; Solomonides, T, NEW YORK, NY: IEEE , 2011Conference paper (Refereed)
    Abstract [en]

    Image-guided surgery (IGS) often depends on X-ray imaging, since pre-operative MRI, CT and PET scans do not provide an up-to-date internal patient view during the operation. X-rays introduce hazardous radiation, but long exposures for monitoring are often necessary to increase accuracy in critical situations. Surgeons often also take multiple X-rays from different angles, as X-rays only provide a distorted 2D perspective from the current viewpoint. We introduce a prototype IGS system that augments 2D X-ray images with spatiotemporal information using a motion tracking system, such that the use of X-rays can be reduced. In addition, an interactive visualization allows exploring 2D X-rays in timeline views and 3D clouds where they are arranged according to the viewpoint at the time of acquisition. The system could be deployed and used without time-consuming calibration, and has the potential to improve surgeons' spatial awareness, while increasing efficiency and patient safety.

  • 191. Jaki Mekjavic, P
    et al.
    Lenassi, E
    Eiken, Ola
    KTH, School of Technology and Health (STH), Basic Science and Biomedicine, Environmental Physiology. KTH, School of Technology and Health (STH), Centres, Swedish Aerospace Physiology Centre, SAPC.
    Mekjavic, IB
    FemHab: The effect of acute hypercapnia during hypoxic bedrest on posterior eye structures in females2015Conference paper (Refereed)
  • 192.
    Ji, Guangchao
    et al.
    KTH, School of Technology and Health (STH).
    Yang, Geng
    KTH, School of Information and Communication Technology (ICT), Industrial and Medical Electronics.
    Yang, Kunlong
    KTH, School of Technology and Health (STH).
    Zheng, LiRong
    KTH, School of Information and Communication Technology (ICT), Industrial and Medical Electronics.
    A User-friendly Wearable Device Based on Plastic Substrate for Heart Disease Monitoring2015In: the 4th International Conference on Computational & Mathematical Biomedical Engineering (CMBE2015), 2015Conference paper (Refereed)
  • 193.
    Johansson Thunqvist, Eva-Lotta
    et al.
    KTH, School of Technology and Health (STH), Centres, Centre for Health and Building, CHB.
    Blomqvist, Göran
    Factors regulating the air-borne spreading of pollutants from roads1998In: The Xth International PIARC Winter Road Congress, London: PTRC Education and Research Services Ltd , 1998, p. 459-468Conference paper (Refereed)
    Abstract [en]

    Pollutants from roads are spread by mechanisms such as splash, spray and ploughing. In this study, the spreading was studied at two locations where information on the local weather was available and the amount of salt applied on the road could be obtained. When comparing the deposition of Na, Ca, K and Mg, the road-related gradient is obvious; the increase of sodium in the containers closest to the road is sometimes more than 1000-fold, and the increase of the other cations 10 - 100 fold. Also during a period of no de-icing the deposition of cations is higher towards the road. The deposition of Na is related to the amount of road salt applied, and also to wind and type and amount of precipitation. The increase of other cations could be an effect of weathering and/or ion-exchange on the fresh surfaces of the road.

  • 194.
    Jörgens, Daniel
    et al.
    KTH, School of Technology and Health (STH), Medical Engineering, Medical Image Processing and Visualization.
    Smedby, Örjan
    KTH, School of Technology and Health (STH), Medical Engineering, Medical Image Processing and Visualization.
    Moreno, Rodrigo
    KTH, School of Technology and Health (STH), Medical Engineering, Medical Image Processing and Visualization.
    Steering second-order tensor voting by vote clustering2016Conference paper (Refereed)
    Abstract [en]

    Among the various diffusion MRI techniques, diffusion tensor imaging (DTI) is still most commonly used in clinical practice in order to investigate connectivity and fibre anatomy in the human brain. Besides its apparent advantages of a short acquisition time and noise robustness compared to other techniques, it suffers from its major weakness of assuming a single fibre model in each voxel. This constitutes a problem for DTI fibre tracking algorithms in regions with crossing fibres. Methods approaching this problem in a postprocessing step employ diffusion-like techniques to correct the directional information. We propose an extension of tensor voting in which information from voxels with a single fibre is used to infer orientation distributions in multi fibre voxels. The method is able to resolve multiple fibre orientations by clustering tensor votes instead of adding them up. Moreover, a new vote casting procedure is proposed which is appropriate even for small neighbourhoods. To account for the locality of DTI data, we use a small neighbourhood for distributing information at a time, but apply the algorithm iteratively to close larger gaps. The method shows promising results in both synthetic cases and for processing DTI-data of the human brain.

  • 195.
    Karbalaie, Abdolamir
    et al.
    KTH, School of Technology and Health (STH).
    Fatemi, Alimohammad
    Etehadtavakol, Mahnaz
    Abtahi, Farhad
    Emrani, Zahra
    Erlandsson, Björn-Erik
    KTH, School of Technology and Health (STH).
    Counting Capillaries in Nailfold Capillaroscopy:State of the Art and a Proposed Method2016In: IECBES 2016 - IEEE-EMBS Conference on Biomedical Engineering and Sciences, Institute of Electrical and Electronics Engineers (IEEE), 2016, p. 170-174, article id 7843437Conference paper (Refereed)
    Abstract [en]

    Capillaries play a crucial role in the microcirculatorysystem by exchanging metabolic substrates and wasteproducts between blood and various tissues. The behavior ofcapillaries is affiliated with the number of capillaries per unitvolume of tissue. Among the various noninvasive techniques availablefor analyzing skin microcirculation, nailfold capillaroscopyis considered to be a simple and easy-to-perform technique thatallows a direct in-vivo visualization of the capillary network.Capillary density is one of the most important parameters in thestudies involving capillaroscopy images. Capillary density in mostof studies is defined as the number of capillaries in one millimeterspan of the distal row in each finger or toe. This definition issilent about counting or excluding the number of capillary withdifferent shapes. However, there is no single standard for countingthe number of capillaries in a span of one millimeter. In thispaper, a novel method is proposed for determining the nailfoldcapillary density. This method is a modified combination of twoexisting techniques: the direct observation and the 90◦ method.Compared to the two existing approaches, the proposed methodis more straightforward and easy to use for cases in which thecapillaries have different shapes and sizes. Through differentexamples, we have shown how this method can be used to selectthe apex point of capillary and subsequently count the numberof capillaries with several papillae.

  • 196. Karltun, Anette
    et al.
    Eklund, Jörgen
    KTH, School of Technology and Health (STH), Ergonomics.
    Interactive research promoting a systems perspective in improving the work situation of 15,000 postmen2008In: Proceedings of the Nordic Ergonomics Society Annual Conference NES 2008, 2008Conference paper (Other academic)
  • 197. Karltun, Anette
    et al.
    Eklund, Jörgen
    KTH, School of Technology and Health (STH), Ergonomics.
    Engkvist, Inga-Lill
    Lindbeck, Lars
    Developing a systems view of butchers' problematic work situation2008Conference paper (Other academic)
  • 198.
    Karltun, Anette
    et al.
    KTH, School of Technology and Health (STH). Jönköping University, Sweden.
    Karltun, Johan
    Dep. of Industrial Engineering and Management, Jönköping University, Sweden.
    Eklund, Jörgen
    KTH, School of Technology and Health (STH), Health Systems Engineering, Ergonomics.
    Berglund, Martina
    KTH, School of Technology and Health (STH). Linköping University, Sweden.
    HTO: a complementary ergonomics perspective2014In: Human Factors in Organizational Design and Management - XI, 2014, p. 355-360Conference paper (Refereed)
    Abstract [en]

    While the broad field of ergonomics and human factors provides a strong potential in systems analysis, design and improvement, the focus risks being perceived unclear for different stakeholders. This paper addresses how focusing the interactions between Humans, Technology and Organization by using the HTO concept contributes to the understanding, communication and use of systems thinking inherent in the discipline of Ergonomics and Human Factors. The authors’ experiences illustrate how the use of the HTO concept in various industries and in academic teaching gives advantages regarding interactions, communicativeness, attractiveness, activity and pedagogical benefits.

  • 199.
    Karltun, Johan
    et al.
    Jönköpings Tekniska Högskola.
    Aili, Katarina
    Karolinska Institutet.
    Vogel, Kjerstin
    KTH, School of Technology and Health (STH), Ergonomics (Closed 20130701).
    Deboners’ stress in alternatively organized work2011In: Human Factors in Organisational Design and Management - X / [ed] Matthias Göbel, Candice Christie, Swantje Zschernack, Andrew Todd, Miriam Mattison, 2011Conference paper (Refereed)
    Abstract [en]

    The high reported rates of work related musculoskeletal disorders (WMSD)and accidents among butchers and deboners in Sweden have resulted in several initiativesto reduce these. In this study, eight deboners working every second week at a pace lineand every second week at single tables, were examined concerning physical work load(heart rate) and feelings of stress and energy (stress-energy formula and interviews). Ther esults show that the physical work load was highest at single tables but that feelings of stress and musculoskeletal strain were highest at the pace line. The reasons for this are discussed.

  • 200. Keramidas, Michail E.
    et al.
    Kounalakis, S.
    Debevec, T.
    Norman, B.
    Gustafsson, T.
    Eiken, Ola
    KTH, School of Technology and Health (STH), Environmental Physiology (Closed 20130701).
    Mekjavic, I.
    The effect of acute normobaric hyperoxia on EPO concentration in healthy males2010Conference paper (Refereed)
1234567 151 - 200 of 452
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