胶囊内镜在不同小肠病变中的选择与诊断价值

目的 探讨胶囊内镜(capsule endoscopy)在不同小肠病变中的选择与诊断价值.方法 将51例接受胶囊内镜检查的患者按照临床表现分为A组(不明原因消化道出血)和B组(不明原因的腹痛、腹泻),分析其接受胶囊内镜检查结果的阳性率及与临床意义.结果 胶囊内镜的总阳性检出率为50.98%(26/51),A组和B组的阳性率分别为67.7%(21/31)和25.0%(5/20),差异有统计学意义(P<0.05).结论 胶囊内镜对不明原因消化道出血的诊断价值优于不明原因的腹痛、腹泻,可作为前者的一线检查方法.     

无线车载语音记录装置的设计与实现

为了规范乘务员的工作用语和协同监控装置分析行车事故，需要对机车电台和列尾装置自动录音，并可以在地面真实地再现列车运行中的呼叫应答情况．本文设计一种基于Wince操作系统实现双通道数字录音，适用于铁路机车的语音记录设备．它不仅可以通过与TAX2通信，取得时间和公里标信息，实现实时录音；还可以实现USB无线（Wi—Fi）和以太网等多种转储方式；另外通过前端数据库和上层解析软件，可以在转储仪或PC机上，按时间、车次和地点等信息对录音文件进行检索、转储和回放．该产品通过了运行试验和现场鉴定，实现小批量装车试用，满足维护铁路运行安全的需求．     

Bleeding detection from wireless capsule endoscopy images using improved euler distance in CIELab

Bleeding in the digestive tract is one of the most common gastrointestinal (GI) tract diseases,as well as the complication of some fatal diseases. Wireless capsule endoscopy (WCE),which is widely applied in the clinical field,allows physicians to noninvasively examine the entire GI tract. However,it is very laborious and timeconsuming to detect the huge amount of WCE images,and limits its wider application. It is urgent and necessary to develop the automatic and intelligent computer aided bleeding detection...     

Development of a wireless capsule endoscope system based on field programmable gate array

A new modular and programmable wireless capsule endoscope is presented in this paper. The capsule system consumes low power and has small physical size. A new image compression algorithm is presented in this paper to reduce power consumption and silicon area. The compression algorithm includes color space transform, uniform quantization, sub-sampling, differential pulse code modulation (DPCM) and Golomb-Rice code. The algorithm is tested in a field programmable gate array (FPGA) development board, and the final result achieves 80% compression rate at 40 dB peak signal to noise ratio (PSNR). The algorithm has high image compression efficiency and low power consumption, compared to other existing works. The system is composed of the following three parts: image capsule endoscope, portable wireless receiver and host computer software. The software and hardware design of the three parts are disscussed in details.     

语音遥控器的设计与制作

语音识别技术的发展为人机交互带来了极大的便利,在家用电器领域得到越来越广泛的应用．本文基于凌阳SPCE061B单片机的语音处理功能设计了学习型语音遥控器,实现了语音控制功能和对其他遥控器的兼容．该语音遥控器硬件设计简单,可以存储多个遥控器的信息,具有良好的通用性,并且可以用语音命令替代普通遥控器的按键功能,方便了用户操作,具有广阔的应用前景．     

Optimization design and experiment of the radio frequency transmission utilized in video capsule endoscope

In view of fuzzy and unstable images received in video capsule endoscopy, and the poor communication effect, an improved radio frequency (RF) transmission circuit module with low power consumption and helix antenna is designed to improve the performance of video transmission and to extend the working time of the capsule. Simulation and analysis of the circuits and antenna with HFSS12 and ADS2011 software are highlighted. Video capsule endoscope prototypes are made and evaluated to verify the feasibility of the proposed design. In vitro tests and animal experiments show that the results of the antenna tests basically meet the simulation, and the power consumption of RF circuit is 15.9mV. The video capsule endoscope works well with the receiver with multiple receiving antennas, and the working time is more than 9 h. It can realize the wireless transmission of the video data, and images received are clear and stable in comparison with the previous designs.     

道路三维可视化系统设计与实现方法

根据道路CAD发展的实际出发,提出了道路三维可视化设计系统。对谊系统的开发目标和功能设计进行了简要介绍,并对系统开发中涉及的关键技术和关键方法进行了讨论,给出了可行的解决方法。     

应用于转向机器人的Zigbee无线测控系统

转向机器人操作稳定性试验能客观评价汽车各项行驶性能.针对传统试验存在的布线复杂和易出错等问题,提出了一种基于Zigbee的无线测控系统,以CC2430芯片为核心的多种传感器节点的硬件和软件的总体设计.该系统能够对汽车的动态参数信号进行实时采集,同时可通过ZigBee无线网络进行实时、安全、可靠的通信.     

A secure and reliable routing protocol for wireless mesh networks

This study proposes an efficient secure routing protocol which considers symmetric and asymmetric links for wireless mesh networks （WMNs）. A wireless mesh network is a group of wireless mesh routers and several kinds of wireless devices （or nodes）. Individual node cooperates by forwarding packets to each other, allowing nodes to communicate beyond the symmetric or asymmetric links. Asymmetric link is a special feature of WMNs because the wireless transmission ranges of different wireless devices may be different. The asymmetric link enhances WMN coverage. Providing security in WMNs has become an important issue over the last few years. Existing research on this topic tends to focus on providing security for routing and data content in the symmetric link. However, most studies overlook the asymmetric link in these networks. This study proposes a novel distributed routing protocol beyond symmetric and asymmetric links, to guarantee the security and high reliability of the established route in a hostile environment, such as WMNs, by avoiding the use of unreliable intermediate nodes. The routes generated by the proposed protocol are shorter than those in prior works. The major objective of the proposed protocol is to allow trustworthy intermediate nodes to participate in the path construction protocol. The mesh clients out of mesh router wireless transmission range may discover a secure route to securely connect to the mesh router for Internet access via the proposed protocol. The proposed protocol enhances wireless mesh network coverage and assures security.     

Experimental study on cyclosporine A drug delivery system in prevention of posterior capsule opacification after intraocular lens implantation in rabbits

Objective To study the effect of cyclosporine A drug delivery system (CsA-DDS) on the prevention of posterior capsule opacification (PCO) after experimental intraocular lens implantation in rabbit eyes. Methods Twenty healthy New Zealand white rabbits, whose left eyes and right eyes were used respectively as experiment eyes and controls, were subjected to extracapsular lens extraction and artificial lens implantation. During the operation, CsA-DDS with poly (lactideco-glycolide) as carriers or empty DDS was implanted in the capsular bag for the experimental eyes and controls respectively. After the operation, anterior chamber reaction, intraocular pressure (IOP) and CsA concentration were monitored and twelve weeks after the operation, the eyes were extracted for histopathological and morphological examinations. Results There were no differences between the two groups in conjunctival congestion,IOP change and anterior chamber reaction. PCO was less severe in the experimental eyes than in the controls. Light microscopy revealed that posterior capsular membrane in the experimental eyes was slick, with no obvious proliferation,whereas in the controls, there were lens epithelial cell proliferation and cortex regeneration of different degrees.Morphological examination with electron microscope showed that in the experimental eyes, lens epithelial cells did not function actively and apoptosis occurred, whereas in the controls, epithelial cells presented active function. No marked ultrastructural changes were found in either group. Conclusion Cs-DDS can inhibit PCO after intraocular lens implantation in rabbit eyes and does not have toxic effects on the surrounding ocular tissues. Therefore, it has a good potential for clinical use in prevention of PCO.     

报文传输网络系统的设计和应用

基于网络技术设计了一种报文传输系统 ,并对安全性应用进行探讨。     

深圳公交的换乘系统建模和设计

使用UML这种标准化的图形建模语言对公交换乘系统进行需求分析、设计、构造和系统测试。     

数控系统宏程序会话编程设计与实现

本文按零件的工艺特性划分数控车削,铣削和线切割加工零件的类别,并设计宏程序零件库。通过对用户宏程序的划分,对适于宏程序编程的典型零件的图形、参数及工艺文件进行详细描述。采用会话编程的方式,生成数控加工零件的宏程序。这种将数控系统宏程序与会话编程相结合的方式,不仅降低了某些零件数控编程的难度,扩展了数控系统的编程功能,同时数控系统的编程能力也得到很大的提升。     

计算机考试系统的设计与实现

本文介绍了计算机上机考试系统的基本构成和功能结构，针对上机考试系统开发过程中存在的问题，提出了相应的解决方法。     

动车组牵引计算仿真系统设计

分析动车组牵引计算仿真系统研究的背景,总结我国主流牵引计算软件运用于动车组计算时存在的不足,结合调研结果和用户需求分析,在此基础上设计一个新的适合动车组牵引计算仿真系统,主要设计内容包括系统功能、关键技术和存在难点。     

交通工程CAE软件系统的设计与实现方法

在分析交通工程软件系统现状的基础上, 给出了基于GIS (地理信息系统) 平台的交通工程CAE (计算机辅助工程) 软件系统的设计方案, 对系统设计中的关键技术进行了分析, 采用数值逼近理论分析交通数据, 并以智能化图形方式显示结果。实例中通过对交通特性中行车速度的分析与处理, 证明了该系统整体方案及交通数据组织与拟合算法的可行性。     

智能果蔬分拣机器人系统设计

农业机器人的广泛应用是农业机械化得以实现的必由之路与重要标志,也是我国跻身世界农业强国之列的基本前提。基于虚拟样机与3D打印技术,研究建立果蔬分拣机器人运动模型,设计一种多功能欠驱动末端执行器,可对条形和类球形果蔬实施有效抓取;采用运动仿真等相关软件对重要工作部件进行结构分析和优化,确定其最佳参数值;最后搭建试验平台进行验证,并对农业机器人的发展前景进行展望。     

无源化汽车轮胎压力监测系统设计与实现

在现有的TPMS(Tire Pressure Monitoring System)基础上提出了一种无源TPMS,该系统能够对轮胎的参数进行实时测量,当轮胎参数出现异常时立即报警。通过在轮胎内部安装微型的压力和温度传感器(NPX1),中央控制单元(NPXC01746)对轮胎内部的温度、压力值进行采集、处理后,通过无线通信的方式将数据发送给驾驶室内部的中央监视器,中央监视器对轮胎的数据进行分析,如果发现轮胎的状态异常,则通过声光报警提示驾驶员进行处理,以避免交通事故的发生。     

对马歇尔设计方法与设计标准的几点看法

介绍了沥青混合料马歇尔配合比设计方法及其优缺点。并对这种设计方法与设计标准提出一些建议，以设计出符合重载、渠化交通的高性能沥青混合料。     

云南省交通电子政务系统的框架设计和实施策略

文章根据云南省和交通部电子政务建设相关要求，结合云南交通行业实际，提出云南省交通电子政务系统建设的框架设计方案及实施策略。