Wenyu Cai

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Video is an important medium for the observation of a variety of phenomena in the physical world such as for water conservancy engineering. Video sensor networks (VSN) consists of a large number of sensor nodes with cheap CMOS cameras, therefore, it has the ability of large scale visual monitoring. However, a kind of powerful and scalable platform is urgent(More)
In this paper, we consider the problem of how to measure the reliability of the large-scale wireless sensor networks, which is a fundamental requirement of wireless sensor networks deployment. Sensing coverage and network connectivity are key QoS requirements of wireless sensor networks, while network lifetime based on energy efficiency and invulnerability(More)
Mobile nodes in mobile ad-hoc networks (MANETs) operate on limited batteries, so it's a very important issue to use energy efficiently and reduce power consumption. To maximize the lifetime of an ad-hoc network, it is essential to prolong each individual node's life through minimizing the transmission energy consumption; some minimum energy routing schemes(More)
Wireless sensor networks (WSN) are often applied to monitor the environment such as mine. Due to the rapid attenuation of the wireless signals and the limited power of the WSN nodes, the performances of WSN in these environments are not ideal. In this paper, we present a hybrid radio over fiber wireless sensor network architecture to compensate the weakness(More)
Wireless sensor networks consist of a large number of sensor nodes with limited battery power, and how to use energy of sensor nodes more efficiently to extend the lifetime of networks is a primary goal in the design of wireless sensor networks. Data aggregation can reduce the traffic in network by utilizing the abilities of local computation and storage of(More)
The traditional cable data transmission is high cost and big interference. instead, the wireless data transmission has advantages like: low cost, better applicability and lower interference. So, a kind of handheld wireless temperature and humidity control system based on the msp430 microcontroller, CC1101 wireless transceiver module and DHT11 temperature(More)
BACKGROUND Dys-megakaryopoiesis is defined as ≥10 % of dysplastic megakaryocytes in bone marrow smears by the World Health Organization. However, concordance rates for dysplastic megakaryocytes between different observers is low and, consequently, evaluation of dysmegakaryopoiesis is also often discordant. RESULTS We performed CD41 immune staining and(More)
This paper put forward a new design of point to point digital transmission system which communicate real-time video and data through 10km coaxial tow cable without relay. System implement MPEG-4 high-speed transcode function and SHDSL technology, which satisfy the dynamic characteristics of 10km coaxial tow cable much better than former analog technique.(More)
Orthogonal frequency division multiplexing (OFDM) signal has a large peak-to-average power ratio (PAPR). Hence, several techniques have been proposed to reduce the PAPR. Clipping is a widely used technique to reduce the peak amplitudes by nonlinearly distorting the OFDM signal at or around the peaks. However, clipping results in symbol distortion because of(More)
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