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Heart rate variability (HRV), a feature extracted from the heart rate signal, is commonly used for monitoring training loads, and fitness status within athletes. Various sensors can be used to ascertain HRV within athletes; two of which are considered within this investigation, namely PPG and ECG. We present methods for HRV collection and calculation using PPG, reducing HRV collection time requirement...
This paper presents a multifunctional hot-wire based microstructure enabling the design of pressure sensors and wall shear stress sensors for aerodynamic applications. The hotwire is suspended over the substrate using periodic silicon oxide micro-bridges, allowing thermal insulation and mechanical toughness. The microstructure design was exploited to realize both wall shear stress sensors experimented...
This paper presents a new CMOS stress sensor readout method based on the ratiometric measurement principle. A unique feature of this method is to simultaneously detect the in-plane stress magnitude and angle. The sensor core is a cascoded current mirror structure consisting of a reference input branch and four output branches with MOSFETs in 0°, 45°, 90° and 135° layout orientations. Current ratios...
The propose of this study is development of sleep disorder detection system. In the first step, Athens insomnia scale questionnaire (AIS), which is an instrument that used to assess about insomnia problem has been used to survey who has an insomnia problem. We used fabric sheet type pressure distribution sensor (Boditrak) in the experiment. Sensor is set on a bed under a bedcover. Experiment's environment...
This paper addresses the problem of damage monitoring system for buried ductile steel pipeline subject to earthquakes. To determine the capacity of a pipeline to perform its mechanical functions face to occasional or incidental damages, such as earthquakes, it is needed to evaluate the structural integrity of pipe and to track relevant environment parameters. This may be performed through intelligent...
This work presents a hydrogenated amorphous silicon (a-Si:H) gate driver circuit for active-matrix liquid crystal displays (AMLCDs) equipped with in-cell touch structure. The display operation can be paused several times in a frame with the horizontal blank driving method to increase the touch reporting rate. Moreover, the pre-charge structure is utilized to reduce the threshold voltage (Vth) shift...
This paper discusses on-going research in the ways Global Software Engineering (GSE) teams collaborate for a range of software development tasks. The paper focuses on providing the means for observing and understanding GSE team member collaboration including team coordination and member communication. Initially the paper provides the background on social and human issues relating to GSE collaboration...
Formation of cracks is a major cause of damage in reinforced concrete (RC) structures which adversely affects the durability along-with appearance of structures. Hence, to understand the behavior of RC structural element under different stresses, it is necessary to obtain significant data describing the characteristics of fracture such as types of cracks, its propagation, failure pattern etc. which...
We present the Fit4Work system for monitoring and management of physical, mental and environmental stress at the workplace. The system was designed specifically for older workers who are subject to sedentary stressful work in an office environment. It uses commercially available devices and intelligent methods, which utilize machine-learning models to monitor the three aspects of the users' lifestyle,...
Research in Machine Learning has increased dramatically over the past couple of decades, with applications greatly benefitting industry. These applications vary widely in the fields of space exploration technologies, transportation, robotics, agriculture, animal husbandry, medicine and finance. However, the agricultural and animal husbandry related applications are relatively few when compared to...
Today smart devices such as smartphones, smartwatches and activity trackers are widely available and accepted in most developed societies. These devices present a broad set of sensors capable of extracting detailed information about different situations of daily life, which, if used for good, have the potential to improve the quality of life not only for individuals but also for the society in general...
The area of flexible electronics is rapidly expanding and evolving. With applications requiring high speed and performance, ultra-thin silicon-based electronics has shown its prominence. However, the change in device response upon bending is a major concern. In absence of suitable analytical and design tool friendly model, the behavior under bent condition is hard to predict. This poses challenges...
With the increasingly immersive environments becoming available, one can't help but wonder the possibilities they unlock. Not only the worlds themselves, but also the avatars that populate them are becoming increasingly more complex. How people can use this developments has been a topic of discussion in the past few years. In this demonstration we use a Virtual Reality Environment (VRE) as a tool...
A model/sensor hybrid approach is implemented to conduct failure prognostics of an automotive electronic control unit (ECU). A 3-D finite element model simulating a complex ECU is built, and its predictability is calibrated and verified by an optical displacement measurement technique called moiré interferometry. The stress states of the ECUs during thermal cyclic loadings are documented by piezoresistive-based...
Electronic packages absorb moisture when exposed to uncontrolled humid conditions during manufacturing processes and service life. At high temperatures, the effects of moisture absorption on electronic packages become even more significant. A number of failure modes are caused by moisture effects such as popcorn cracking, delamination, and electrochemical migration. In this study, the effects of moisture...
At present, several studies exist describing the relevance of human factor in air transport with main focus on pilots and flight safety. Within such studies, monitoring of physiological functions is used. There are lot of physiological parameters and methods of their assessment; however, they are mostly based on principles originating from clinical practice. Yet, sensitivity and specificity of these...
Presented in this paper is a development of a high-performance piezoresistive micro-accelerometer based on the slot etching in the EB (eight-beam) structure for the vibration detection of high speed spindle. The proposed SEB (slotted eight-beam) structure consists of a proof mass supported by four slotted sensing beams and four suspension beams, which in order to improve the trade-off between the...
Additive manufacturing is considered as a revolution in manufacturing. One of this type of manufacturing, three-dimensional (3D) inkjet printing is capable of quickly printing conductive tracks on flexible materials, and have attracted considerable attentions in recent years. To take advantage of this technology, flexible micro-sensors for measuring shear stress and pressure are fabricated from silver...
Multidimensional Scaling (MDS) is a widely used technique for visualizing a set of objects in an n-dimensional space. It has been extensively applied in wireless sensor networks for deriving the coordinates of a set of nodes in distance-based Localization. Many variants of MDS have been proposed to overcome issues such as partial connectivity and different types of noise in the measurements. In particular,...
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