Digital Signal Processing Based Real Time Vehicular Detection System

Traffic monitoring is of major importance for enforcing traffic management policies. To accomplish this task, the detection of vehicle can be achieved by exploiting image analysis techniques. In this paper, a solution is presented to obtain various traffic parameters through vehicular video detection system( VVDS). VVDS exploits the algorithm based on virtual loops to detect moving vehicle in real time. This algorithm uses the background differencing method, and vehicles can be detected through luminance difference of pixels between background image and current image. Furthermore a novel technology named as spatio-temporal image sequences analysis is applied to background differencing to improve detection accuracy. Then a hardware implementation of a digital signal processing (DSP) based board is described in detail and the board can simultaneously process fourchannel video from different cameras. The benefit of usage of DSP is that images of a roadway can be processed at frame rate due to DSP‘s high performance. In the end, VVDS is tested on realworld scenes and experiment results show that the system is both fast and robust to the surveillance of transportation.     

Mathematical Analysis of Energy Efficiency in IEEE 802.11 DCF

The standardized IEEE ,802. II distributed coordination function （ DCF） provides a contention-based distributed channel access mechanism for mobile stations to share the wireless medium. However, when stations are mobile or portable units, power consumption becomes a primary issue since terminals are usually battery driven. This paper proposes an analytical model that calculates the energy efficiency of both the basic and the RTS/CTS access mechanisms of the IEEE 802. II protocol. The model is validated with simulation results using NS-2 simulation package. The effects of the network size, the average packet length, the initial contention window and maximum backoff stages on the energy efficiency of both access mechanisms are also investigated. Results show that the basic scheme has low energy efficiency at large packet length and large network size, and depends strongly on the number of stations and the backoff procedure parameters. Conversely, the RTS/CTS mechanism provides higher energy efficiency when the network size is large, and is more robust to variations in the backoff procedure parameters.     

用神经网络方法由蛋白质一级序列预测其二级结构含量

基于氨基酸组成和有偏自相关函数的特征参量 ,利用BP神经网络 ,提出了一种预测蛋白质二级结构中α螺旋和 β折叠含量的计算方法 .采用相互独立的非同源蛋白质数据库对该方法的准确性进行检验 ,对蛋白质二级结构α螺旋和 β折叠含量的预测的结果为 :自检验的平均绝对误差分别为 0 .0 70和 0 .0 6 8,相应的标准偏差分别为 0 .0 49和 0 .0 47;他检验的平均绝对误差分别为 0 .0 75和 0 .0 70 ,相应的标准偏差分别为 0 .0 5 0和 0 .0 49.与常用方法相比 ,利用此方法预测蛋白质二级结构含量可有效提高预测精度 .     

有限的概念术语 无限的发展前景——论王希杰先生的"三一"修辞学理论

当代语言学、修辞学大家王希杰先生的“三一”修辞学理论，反愉部修辞学的问题建立在以下三组概念之上：四个世界、零度和偏离、显性和潜性。这个理论体系抽象出了当代修辞学最重要最基本的概念，提高了 修辞学的科学品位和社会功能，因此，可望为21世纪的修辞学研究带来无限广阔的发展前景。     

试论云南发展小城镇的对策

发展小城镇是云南提高城市化水平的现实选择。本从云南的省情出发，提出云南发展小城镇的6条原则和7条举措。     

论品牌与文化

本根据中西化的特点和差异，通过化与品牌的关系以及化在品牌运作中的作用，比较了中西品牌。强调在西方品牌大规模向中国进军时，打造中国民族化品牌，显得至关重要。     

我国陪审员制度改革略论

陪审制度是国家审判机关吸收非职业法官或非职业审判员参加刑事、民事案件审判的一种诉讼制度。在我国为体现司法民主将其称之为人民陪审员制度，它在司法领域中发挥着越来越重要的作用．但在司法实践中，由于其制度本身的不完善，影响了它的广泛运用。在新一轮司法制度改革中，有必要对我国现行的陪审员制度进行改革。     

和谐：可持续发展的理论基础

和谐是可持续发展的理论基础。人与自然的和谐是可持续发展的前提,人与人的和谐是可持续发展的关键。实施可持续发展战略,需协调好经济发展与环境保护、经济发展与社会进步、一国利益与人类整体利益的关系,使生态、经济和社会和谐发展。     

拉美魔幻现实主义与中国寻根文学

1982年哥伦比亚作家马尔克斯的魔幻现实主义长篇小说《百年孤独》获得诺贝尔文学奖,一时之间引起轰动。中国作家吸取其成功经验,以现代主义手法表现本民族的文化传统和社会生活,在中国大陆文坛上兴起了一股声势浩大的寻根文学潮流,产生了许多优秀之作。     

开启幼儿智慧的金钥匙--零至五岁幼儿语言教育

文章探讨了零至五岁幼儿语言教育的重要性、可行性,幼儿语言的发展规律和早期教育的内容和方法.