粒子图像测试实验中的图像采集控制方法

针对粒子图像测速(PIV)实验过程中的图像采集问题,基于现场可编门阵列(FPGA)技术提出一种适用于流场图像采集的控制方法。该方法根据PIV实验时的图像分辨率高、位宽大、传输速率高的特点进行了控制结构的优化设计:首先FPGA将配置信息发送给相机,然后在FPGA上产生用于相机、光源同步的触发控制信号,在FPGA内部进行图像信号的采集与传输。所提方法中,整个PIV数据的采集与控制均在一片FPGA芯片上进行,大大提高了系统的集成度,从而增强了系统的稳定性。最后,对所提的控制方法进行了验证分析。结果表明:所提方法可以有效地解决粒子图像的采集问题。     

基于物联网的智慧校园无线视频监控系统

为加强学校安全防范,打造无线智慧校园,设计了基于物联网的无线视频监控系统。根据视频信息的传输需要传输大量的数据,本系统设计运用了高压缩率的H.264标准的图像压缩编码技术降低传输数据所占的信道宽度,同时使用了具有优秀的多媒体处理功能的ARM11处理器来提高图像信息的传输速率,并通过ZigBee无线网络把已编码的数据传送到显示器。整个系统主要是围绕着图像信息的采集、处理、传输和存储来设计的具有稳定、低功耗、高传输率无线视频监控系统,在视频监控方面具有很大的实用性价值。     

基于GPRS技术的远端无线图像采集系统的研制

研制了基于GPRS技术的远端无线图像采集系统,利用已有移动通信GSM无线网络实现图像数据的传输,具有覆盖面广,无需增加传输设备和线路的特点。采用JPEG硬件压缩编码技术,对静态图像进行压缩编码,较大地减少了网络传输的数据量,节省了网络资源,提高了图片的传输速度。系统硬件结构采用微控制器加可编程逻辑控制芯片(MCU+CPLD)的方案,各子功能由标准通用模块完成,降低了系统复杂度,提高了系统整体性能,用户可以用PC机在Internet上实现图像的远端采集与现场监控。该系统经过现场运行与测试,达到设计要求。     

基于ZigBee技术的仓储环境监测系统设计

在传统的仓储系统中引入ZigBee技术,通过无线传感器采集温度、湿度及光照强度,利用ZigBee无线网络对采集到的数据进行传输,并通过监测平台对数据进行分析和处理,实现对仓储环境的智能监测及控制.系统具有很高的实用性.     

一种基于无线传感器网络的生理信号采集系统（英文）

提出了一种应用于课堂教育的无线生理采集系统,以了解学生在上课过程中的生理变化情况.系统中,反映学生的注意力和情绪状态的生理电信号可通过测量ECG来获得.生物电信号采用200Hz的采样速率,并由ZigBee协议进行无线传输.同时,节点嵌入了蓝牙技术以适应高采样速率和高带宽的传输要求.本系统可以同时对30个学生进行监测,并且给出了系统在教室执行监测任务的实验结果.最后探讨了无线传感器网络在教育领域的应用.     

面向环境监测的定向感知无线多媒体传感器网络设计

针对环境监测中细粒度、重点监测的实际需要,设计了一种基于ZigBee无线感知节点和ZigBee+WiFi多媒体感知节点的无线多媒体传感器网络。在普通环境监测区域,通过ZigBee无线感知节点采集环境温度、湿度、烟雾等数据,并上传至附近多媒体感知节点。多媒体感知节点在接收ZigBee节点数据的同时,摄像头、语音采集单元和Wi Fi网络实现了对重点环境监测区域的图像、语音数据采集和传输,此外,通过对附近ZigBee节点上传数据的分析,结合舵机云台、姿态感知和GPS定位系统,多媒体感知节点实现了对异常区域图像、语音数据的定向采集。试验证明,该系统实现了对环境的细粒度感知和异常区域定向监测,具有很好的实用价值。     

基于DSP和FPGA的竹片图像采集与处理系统设计

针对图像采集需要实时、高速的要求,本文提出的基于DSP(TMS320C6416)和FPGA(EP2C35)图像采集系统的设计方案。该设计通过前端FPGA控制OV9650摄像头进行图像采集,预处理,然后通过FPGA的FIFO进行数据缓存,利用DSP的EMIFB接口实现数据的传输,最后对采集的图像进行Sobel算子的边缘检测,灰度共生矩阵的纹理分析、图像标准差运算以及基于相关函数的图像配准。     

多媒体教学系统中图像传输的研究与实现

随着计算机网络的发展,图像传输在设计多媒体教学系统中有着举足轻重的作用.文章针对多媒体教学系统实时性要求,详细分析了图像信息的采集、处理(压缩、进行编码等)、网络传输、接收以及网络地址转换等基本原理,实现了利用JMF进行图像数据的传输.     

基于CCD车载图像压缩系统设计

针对CCD图像传感器的特点，将CCD的光纤图像传输系统，通过CPU转换，变成无线传输．无线传输带宽有限的特点，设计了一种车载图像采集设备的压缩系统，此系统具有大比例、多分辨率压缩的特点，能够根据无线信道的情况按需配置图像压缩比．     

基于ZigBee技术构建无线传感器网络

基于无线传感器网络和ZigBee协议特点分析了ZigBee协议栈的体系结构、无线传感器网络的组网原理、构建基于ZigBee技术的无线传感器网络的关键技术;采用模块化方法实现了ZigBee协议栈,并结合传感器技术、ZigBee技术、IEEE 802.15.4协议、路由协议设计系统架构、ZigBee无线技术组网及传输模式;重点探讨基于ZigBee技术无线传感器网络的构建与应用.     

Western and Eastern culture differences in commercial field

The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity.     

风的曲线

Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose.     

团图为数的图中的闭团贯数

Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F.     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

Social and Cultural Influence on Word Meaning

Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language.     

汉字倒说

汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Where the Action Is: How Drama Contributes to the Art of the Teaching and Learning of English

This paper looks at the way drama works to bring a model of an arts curriculum into reality. He also shows how drama is valuable when discussed as a separate, autonomous subject in the school curriculum as opposed to one subsumed within English. He argues for a view of the arts and gives an example of a sequence of work in an English GCSE class based around Arthur Miller's play View from the Bridge. From this he draws out several strands about the relationship of the drama curriculum to the individual students and teachers, the school, and to culture. He also emphasises the primacy of performance in drama education.