In the background of worldwide resources shortage, as a new kind of green lighting device, LED is considerd to take the place of traditional incandescent and fluorescent lights by more and more people. Then a kind of communication based on visible light LED comes in.Compared to radio communication, visible light LED communication(VLC) has the advantage
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Femtocell is a kind of micro base station which is widely studied according to the trend of broadband mobile development, to provide better service quality for the users of the indoor scenes such as family and business office. In two-tier macrocell and femtocell networks, spectrum allocation is critical to the practical application of the femtocell
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In the future, the key point of the development of the optical fiber communication systems is to achieve the goal of transmitting optical signals in ultrahigh-speed over long-haul distance without repeaters.The primary limiting factors which make it difficult to transmit signals in high-speed and long-haul optical fiber communication systems are fiber losses, fiber nonlinearities and
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Along with the rapid development and the globalization trend of network, Chinese enterprises must catch up with the trend of the modern management in the increasingly competitive global market environment. An important strategy of improving the management level and market competitiveness is to realize information system in enterprise. This thesis is based on the company’s
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Optical coherence tomography(OCT) is a non-immersion new optical diagnosis three dimensional reconstruction imaging technology which be can used for biological tissue and various materials. Wide Field optical coherence tomography(WFOCT) is an extention for the traditional OCT, whaterever system in OCT sample’s nature colors are neglected and its pseudo-color images are obtained by image processing. Actually
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With continues increasing of computing power,the whidely used computer systems become more and more important while became larger and larger. In many industries like manufacturing, telecommunication and bank, computers already become the most critical production systems. At this moment, most systems are UNIX based, and those UNIX systems need to be always available (7×24 uptime)
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With the development of microelectronics technology, micro-electrical mechanical systems (MEMS) are widely used in the area of measurement due to the advantages of small size, light weight, low cost, low power and wide dynamic range. In this paper, an implementation of attitude measurement system based on MEMS inertial sensors is proposed, which can achieve attitude
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The most important technology in high-performance mixed-signal system is the design of high speed A/D converter. And high-speed CMOS A/D converter design is one of the technical bottlenecks which have been the focus of international research. It has a good theoretical research value and important application prospect that the research and development of new structures
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With fast development of rail transit, coupling degree among lines of city rail transit network would be higher and higher, and interchanging among lines is becoming frequence more and more. Due to high investment, long work period and etc. of rail transit construction, different main body of business operation and profit would be concerned in
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Software aging means that the performance of a system will be dropped after the software runs a long time. With the continuous development of computer technology, software becomes large part of computer system. The reliability of software has also become a major constraining factor in system reliability. Research and practice shows that long-running software system
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