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In this paper, two hybrid multi-hop/single-hop opportunistic transmission strategies for lifetime extension of WSNs are proposed. To prolong the network lifetime, a systematic model that contains a network distribution block, a routing algorithm block, a traffic pattern block and an optimal policy block is presented to determine the optimal transmission probability of each node. With the global routing...
Multi-unit vibration frequency is low, the state information exist mutual interference problems, the traditional state monitoring method mainly analyzed the signal equipment unit stability, once the state signal equipment units appeared significant volatility, the status of equipment unit monitoring information is unable to obtain accurately. This paper presented the remote condition monitoring method...
Three dimensional (3-D) photoacoustic imaging is demonstrated in this study by using a 4 × 4 CMOS (complementary metal oxide semiconductor) micromachined capacitive ultrasonic sensor array. The sensing membranes are fabricated by a post-CMOS metal etch and sealed by parylene with a measured resonant frequency between 3 to 5.1 MHz. The area of a single detection unit is 280 × 280 μm2. A large 2-D aperture...
In this study, we demonstrate the feasibility of three dimensional (3-D) photoacoustic imaging using a monolithic CMOS MEMS capacitive ultrasonic sensor. The sensing membranes are released by a post-CMOS metal etch and sealed by silicon dioxide. Nine membranes, each with an inner diameter of 60 µm, form a single detection unit with a capacitance value of 292.5 fF. The measured sensitivity is 151 mV...
In this paper, we investigate the service coverage for interweaving cognitive radio networks with cooperative relays in shadowed areas within the metropolitan region. We highlight the influence of relays on the primary and secondary systems in severe shadow fading channels. The outage probability is utilized as a comprehensive performance metric to characterize the coverage quality for the cognitive...
In this letter, we demonstrate the feasibility of 3-D photoacoustic imaging using a monolithic CMOS micromachined capacitive ultrasonic sensor. The sensing membranes are released by a post-CMOS metal etch and sealed by silicon dioxide. Nine membranes, each with an inner diameter of 60 , form a single detection unit with a capacitance value of 292.5 fF. A 6- carbon fiber was...
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