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A short circuit between the stator winding turns is one of the most common faults affecting electrical motors. It can rapidly evolve to more serious faults causing significant degradation of the performance of the machine. This paper investigates inter-turns short circuit fault diagnosis in brushless direct-current (BLDC) motors. A fault diagnosis approach based on a super twisting sliding mode observer...
Acetone existing in human breath is an effective biomarker of diabetes which can be used for the early diagnosis and daily monitoring of diabetes. Comparing to the conventional method for diabetes diagnosis and monitoring that analyzes the blood glucose level in blood, breath analysis of acetone is a very need of a method in view of its merits such as non-invasive, accurate, convenient, and inexpensive...
Hazardous environments at the workplace are a significant contributor to injuries due to accidents as well as chronic diseases. There are many occupational health and safety (OHS) systems, but they are costly or not flexible. This paper presents a low-cost OHS. It consists of various sensors that can be used to monitor whether a safety helmet is being worn, the worker is mobile and safety boots are...
A novel flexible printed strain gauge was fabricated successfully on a flexible paper substrate using flexography printing process. Silver (Ag) ink was printed on the paper substrate as metallization layer. The performance of the printed device was investigated by subjecting the strain gauge to a 3-point bend test, with a displacement of 1 mm and 2 mm at 3 Hz operating frequency for 500 cycles. The...
To facilitate the construction of wiring project and lowering the network costs, Pyxos chip can become the node of a Pyxos network by embedding said chip into the temperature sensor, creating an intelligent building monitoring system. The system consists of Pyxos detecting layer, Lon Works control layer and internet data layer. The system is used to control the electrical and mechanical equipment...
One of the key challenges in operational trust management is to continually monitor the behavior of a node and update its trust score accordingly - evidently, both speed and accuracy is of great importance here. To achieve these goals, several papers have explored the concept of mutual revocation (sometimes termed suicide) wherein the trust value of both the accuser and the accused node are temporarily...
VLSI circuits usually allocate excess margin to account for worst-case process variation. Since most chips are fabricated at process conditions better than the worst-case corner, adaptive voltage scaling (AVS) is commonly used to reduce power consumption whenever possible. A typical AVS setup relies on a performance monitor that replicates critical paths of the circuit to guide voltage scaling. However,...
Energy is a limited resource in wireless sensors networks. One kind of digital wireless gas node with low power consumption is designed and implemented, the main point of energy saving technology is advanced and the design of each model is given in details. With analysis and computation of the energy consumption of real gas node, the following conclusion is made: the gas node with low power consumption...
Knitting is a kind of fabric forming method, and knitted fabrics are used traditionally in clothing as well as home furnishing. But recently, by using novel techniques and materials, knitted fabric has broadened its application in medical field. In this study, some knitted fabrics were produced by using conductive fibers, and the relationship between the electrical property and the extension of conductive...
During the last few decades a growing interest in monitoring and preserving strategic heritage and civil structures, has pushed the research towards the development of new devices and strategies for measuring the quantities of interest. The measuring strategies, based on innovative transducers, are required to avoid any significant influence on the monitored structure either in terms of functionality...
The accumulation of fatigue damage in critical structural members of the aging aircrafts is an increasingly complex and continuing high priority problem. There is growing evidence that (i) multiple site damage or multiple element damage may compromise fail safety in older aircrafts, and (ii) significant fatigue damage, with subsequent formation of cracks, may occur at locations not considered in original...
The 3 most important issues for anomaly detection based intrusion detection systems by using data mining methods are: feature selection, data value normalization, and the choice of data mining algorithms. In this paper, we study primarily the feature selection of network traffic and its impact on the detection rates. We use KDD CUP 1999 dataset as the sample for the study. We group the features of...
In this study, we fabricated in-plane thermoelectric micro-generators (4 mm times 4 mm) based on bismuth telluride thin films by using flash evaporation method. The thermoelectric properties of as-grown thin films are lower than those of bulk materials. Therefore the as-grown thin films were annealed in hydrogen at atmospheric pressure for 1 hour in a temperature range of 200 degC. to 400degC. By...
In deep submicron era, to prevent larger amount of SRAM from more frequently encountered overheating problems and react accordingly for each possible hotspots, multiple ideal run-time temperature sensors must be closely located and response rapidly to secure system reliability while maintaining core frequency. This paper presented a method to extract run-time temperature information from multiple...
The real time monitoring and control of resistance spot welds is a problem of critical importance in automotive and many other manufacturing industries. However, till this date, there are no reliable, low-cost, non-destructive techniques for predicting the size and strength of the weld nuggets in real time. This paper investigates the usage of voltage, current, and force data for the above tasks....
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