An operational amplifier based instrumentation amplifier (IA) with a common-mode rejection ratio (CMRR) independent of resistance tolerances is presented in this paper. The CMRR is determined by the operational amplifier characteristics. The IA shows a high CMRR up to 100 kHz. Moreover, since the presented IA operates in the current domain, no large internal voltage swings occur, making it an interesting choice for low-voltage applications in situations where common-mode disturbances may affect the signal processing.
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from the article: The demand for a wireless CO2 solution is ever increasing. One of the biggest problems with the majority of commercial available CO2 sensors is the high energy consumption which makes them unsuitable for battery operation. Possible candidates for CO2 sensing in a low power wireless application are very limited and show a problematic calibration process. This study focuses on one of those EMF candidates, which is a Ag4RbI5 based sensor. This EMF sensor is based on the potentiometric principle and consumes no energy. The EMF cell was studied in a chamber where humidity, temperature and CO2 level could be controlled. This study gives an detailed insight in the different drift properties of the potentiometric CO2 sensor and a method to amplify the sensors signal. Furthermore, a method to minimize the several types of drift is given. With this method the temperature drift can be decreased by a factor 10, making the sensor a possible candidate for a wireless CO2 sensor network.
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Maatschappelijke uitdagingen In toenemende mate vertrouwen we een deel van ethische besluitvorming aan smart-technology toe. Technologie heeft vaker dan ooit een ethische lading. Dit kan soms verregaande consequenties hebben voor consumenten, burgers of organisaties. Hoe zeker moet een algoritme zijn van haar zaak om een burger van fraude te beschuldigen? Hoeveel risico mag een chat-bot die financieel advies geeft een klant laten lopen? Wie mag bepalen hoe een algoritme op een sociaal media platform omgaat met desinformatie? Dergelijke vragen leiden tot belangrijke uitdagingen op het gebied van morele autoriteit, ethische besluitvorming, en morele strategievorming. Strategievorming in snel veranderend speelveld In zijn rede zal Bart pleiten om niet zozeer dé oplossing bij ethisch technologische vraagstukken te vinden, maar vooral een manier te zoeken om op een bestendige manier om te gaan met een snel veranderend speelveld. In veel gevallen lijken oplossingen in zowel de private als publieke sector voor techno-ethische vraagstukken korte-termijn gericht. En zijn het vaak maatregelen die snel en vooral zichtbaar een negatief effect van technologie proberen in te dammen. In zijn lectorale rede zal Bart ingaan op hoe belangrijk het erkennen en herkennen van ethische vraagstukken bij het programmeren van nieuwe technologie is. Maar ook hoe men de menselijke maat kan vangen én gebruiken als input in het ontwerp van nieuwe technologie. Er is volgens hem vooral een bestendige strategie nodig.
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This paper describes the work that is done by a group of I3 students at Philips CFT in Eindhoven, Netherlands. I3 is an initiative of Fontys University of Professional Education also located in Eindhoven. The work focuses on the use of computer vision in motion control. Experiments are done with several techniques for object recognition and tracking, and with the guidance of a robot movement by means of computer vision. These experiments involve detection of coloured objects, object detection based on specific features, template matching with automatically generated templates, and interaction of a robot with a physical object that is viewed by a camera mounted on the robot.
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The 5th generation of mobile communications is designed to employ both FR1 and FR2 bands throughout the world. The higher frequency bands (i.e., FR2 n257 26.50 - 29.50 GHz) are posing several challenges to operators and national telecom agencies for performing electromagnetic fields (EMF) measurements. In this work we present the design and preliminary evaluation of an FR2 sensor node to measure EMF radiations in urban environments. The design is carried out in an RF circuit design software, i.e., Keysight ADS, where the various nonidealities (i.e., nonlinearities, noise behavior and electromagnetic response) of the various sub blocks of the systems are accounted for. The sensor concept is then implemented in a prototype board technology (i.e., X-microwave) and its response is experimentally verified in the FR2 band.
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Description of a new hand/palm-held computerized 3D force measuring system. The system is built for interface (direct) measurement of 3D manual contact force with real-time data presentation. Static calibration was performed of the 3D force sensor with variable preloads to study their effect as well of the prototype system adapted for clinical manual examination and treatment. The new system enables, for the first time, recording and presenting of 3D manual contact forces at the patient-practitioner interface. 3D direct manual contact force measures have the potential to give a more complete and differentiated characterization of patient and practitioner forces than 1D forces. Clinical validity of the prototype system will have to be investigated, and for studying specific clinical manual handling techniques, obvious limitations require further development.
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From Science direct: One of the nanowires was covered with a 2-Hydroxyethyl methacrylate based compound to prevent hydrogen from reaching the wire. The compound was dried by a UV source and tested in chamber for comparison with previous measurements. The results shows that temperature effects can be reduced by a digital signal processing algorithm without measuring temperature near or at the substrate. With this method no additional temperature probes are necessary making this solution a candidate for ultra low power wireless applications.
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While research has shown the multiple benefits of single-bed patient rooms in hospitals, amongst which the experience of privacy and dignity, the majority of patient rooms in existing hospitals are shared. Transforming them into single-patient rooms can be time-consuming, costly or even impossible, which motivates this study looking into privacy in multiple-patient rooms. To share a hospital room, means to share sensitive information with total strangers. This may cause uncomfortable situations for both patients. Furthermore, the awareness of other ears in the room can withhold some patients from sharing important information during daily ward rounds The aim of this study was to investigate the acoustic effect and the acceptance of an adjustable sound masking system in a 4-bed patient room. The objective of the system is that when a doctor shares personal information with one patient, the other patients in the room are not able to understand the conversation.
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PCK is seen as the transformation of content knowledge and pedagogical knowledge into a different type of knowledge that is used to develop and carry out teaching strategies. To gain more insight into the extent to which PCK is content specific, the PCK about more topics or concepts should be compared. However, researchers have rarely compared teachers’ concrete PCK about more than one topic. To examine the content dependency of PCK, we captured the PCK of sixteen experienced Dutch history teachers about two historical contexts (i.e. topics) using interviews and Content Representation questionnaires. Analysis reveals that all history teachers’ PCK about the two contexts overlaps, although the degree of overlap differs. Teachers with relatively more overlap are driven by their overarching subject related goals and less by the historical context they teach. We discuss the significance of these outcomes for the role of teaching orientation as a part of PCK.
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Based on the theory of embodied cognition we developed NOOT, at tangible tool that allows marking audio-moments during creative sessions. A detailed analysis of using NOOT in practice lead to a reconceptualization of NOOT within processes of external scaffolding. It also spurred a new design project focused on reflection during group sessions
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