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本系统采用C/S模式,客户端采用Android开发平台,服务器端采用Java开发环境,客户端与服务器端之间的连接通过Socket通信,提供对图像信息的基本操作,包括图像添加、删除、查找、上传以及分类等,从而实现了一种基于Socket的手机图像采集和传输系统。 相似文献
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应用S3C2440处理器构建了智能网络家居系统,在Linux操作系统下构建了BOA服务器,具有源代码开放、性能高等特点,利用HTML语言和CGI构建Web客户端,通过TCP/IP协议实现了客户端和服务器端访问,实现远程控制和数据采集。 相似文献
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重点讨论了客户端,服务器的程序设计方法,利用面向对象的编程方法,进行了整个系统的设计。设计了服务器端处理用户请求算法、客户端处理服务器发送来数据算法,设计了服务器端的底层通讯类、客户/服务器之间的通讯的数据类,设计了发送数据的确认消息的编码方案、服务器端分配用户帐号的策略等。实现了TCP/IP网络的即时消息传送、消息广播、实时聊天、文件传输等功能。 相似文献
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《电子技术与软件工程》2016,(1)
在移动客户端操作系统是Android并且服务端通过Web Service提供编程接口的情况下,实现了客户端与服务器端的信息交互。本文主要依托车辆检验系统中的手持安卓终端和Web服务通信过程为例,对Android客户端和Web Service结合构建可扩展、易于维护的应用系统提供了高效的方法。 相似文献
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基于DirectShow的嵌入式Linux视频监控系统 总被引:1,自引:0,他引:1
提出一套完整的嵌入式Linux视频监控系统,被监控端建立在嵌入式Linux系统下,监控端系统建立在Windows系统下,基于DirectShow技术完成,并介绍被监控端涉及的多线程问题和监控端的DirectShow技术和双缓冲技术. 相似文献
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目的:建立骨皮质切开术辅助组牙压低的动物实验模型,并观察实验牙移动速度及牙根、牙周组织的改变。方法:选取雄性Begle犬2条,设定下颌第三、四前磨牙为实验牙,随机取一侧为实验侧,对侧为对照侧,以第二磨牙为空白对照。在实验侧施行骨皮质切开术,一月后,以微种植体为支抗,加力压低双侧实验组牙。持续加力30天将动物处死取材,标本经HE染色处理后进行结果观察。结果:实验动物均耐受手术。在组牙压人过程中,实验侧牙齿较对照侧有更大程度的压低,实验侧实验牙根尖区的牙根吸收和牙周膜的透明样变较对照侧轻,但实验侧牙槽骨观察到的破骨吸收现象更明显。结论:以微种植体为支抗建立的骨皮质切开术辅助组牙压低的动物模型科学、可靠,为进一步研究提供了较好的平台。 相似文献
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由于近年来交通事故不断增多,汽车侧面碰撞造成的人员伤亡数量不断增加,而且安全气囊的使用情况并不能使人满意,某些情况下甚至会出现气囊引爆时的冲击伤害到人体。鉴于这种情况,提出了基于压力传感器对现有汽车侧面安全气囊的改进,通过压力传感器可以减少从碰撞到引爆所需时间,以及通过座椅的传感器获取乘坐人员信息对安全气囊进行调整,以达到对人员保护的最佳效果。 相似文献
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Over past few decades, various ways have been conducted through side channel attacks to steal information for a computer system. Unlike conventional hardware-based methods, i.e. power-based side channel, side channel on micro-architecture does not require any physical access to the devices under interest. Instead, only compromised programs need to be co-located on the same machine as the victim. For some other scenarios, malicious users can form side channel information leveraging the timing of program execution. In this survey, we are presenting a comprehensive taxonomy of attack vectors in stack cache memory modules, which mostly are the points of attack by side channel. Due to the significance of side channel attacks, the challenges and overheads of these attack vectors are described through the course of this study. We discuss what side channel attacks are, how they are used, and how they can be prevented through the use of obfuscation techniques. To accomplish this, we introduce the findings of a number of relevant works. These include successful attacks on systems using novel variations of side channel attacks and preventative measures against the attacks. 相似文献
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Ming-Hui Chu S.W. Liang Chih Chen Annie T. Huang 《Journal of Electronic Materials》2012,41(9):2502-2507
Organic solderable preservative (OSP) has been adopted as the Cu substrate surface finish in flip-chip solder joints for many years. In this study, the electromigration behavior of lead-free Sn-Cu solder alloys with thin-film under bump metallization and OSP surface finish was investigated. The results showed that severe damage occurred on the substrate side (cathode side), whereas the damage on the chip side (cathode side) was not severe. The damage on the substrate side included void formation, copper dissolution, and formation of intermetallic compounds (IMCs). The OSP Cu interface on the substrate side became the weakest point in the solder joint even when thin-film metallization was used on the chip side. Three-dimensional simulations were employed to investigate the current density distribution in the area between the OSP Cu surface finish and the solder. The results indicated that the current density was higher along the periphery of the bonding area between the solder and the Cu pad, consistent with the area of IMC and void formation in our experimental results. 相似文献
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Impact of the Nature of the Side‐Chains on the Polymer‐Fullerene Packing in the Mixed Regions of Bulk Heterojunction Solar Cells
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Tonghui Wang Mahesh Kumar Ravva Jean‐Luc Brédas 《Advanced functional materials》2016,26(32):5913-5921
Polymer‐fullerene packing in mixed regions of a bulk heterojunction solar cell is expected to play a major role in exciton‐dissociation, charge‐separation, and charge‐recombination processes. Here, molecular dynamics simulations are combined with density functional theory calculations to examine the impact of nature and location of polymer side‐chains on the polymer‐fullerene packing in mixed regions. The focus is on poly‐benzo[1,2‐b:4,5‐b′]dithiophene‐thieno[3,4‐c]pyrrole‐4,6‐dione (PBDTTPD) as electron‐donating material and [6,6]‐phenyl‐C61‐butyric acid methyl ester (PC61BM) as electron‐accepting material. Three polymer side‐chain patterns are considered: i) linear side‐chains on both benzodithiophene (BDT) and thienopyrroledione (TPD) moieties; ii) two linear side‐chains on BDT and a branched side‐chain on TPD; and iii) two branched side‐chains on BDT and a linear side‐chain on TPD. Increasing the number of branched side‐chains is found to decrease the polymer packing density and thereby to enhance PBDTTPD–PC61 BM mixing. The nature and location of side‐chains are found to play a determining role in the probability of finding PC61BM molecules close to either BDT or TPD. The electronic couplings relevant for the exciton‐dissociation and charge‐recombination processes are also evaluated. Overall, the findings are consistent with the experimental evolution of the PBDTTPD–PC61BM solar‐cell performance as a function of side‐chain patterns. 相似文献
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采用有限元法分析了梯形隧道中横截面尺寸对传输特性的影响。分别对梯形隧道上边宽度、下边宽度和高度尺寸的变化对主模和最低次高阶模截止频率及通信带宽的影响进行了研究,并得出结论:梯形隧道中上边宽度、下边宽度和高度的增大会使隧道中电磁波截止频率降低;在隧道下边宽度增加或者隧道高度减小的情况下会得到较大的通信带宽。 相似文献
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针对汽车侧滑量的测量,采用计量光栅位移传感器,根据莫尔条纹原理测量侧滑试验台滑板的机械位移,进而通过对光栅传感器的两相位置信号进行鉴相及四倍频,由单片机进行数据处理,锁定并显示测量过程中的侧滑量峰值,同时通过串行端口将侧滑量数据传送至上位PC机中。大大提高了测量速度、精度和重复性。 相似文献