传输效率

• The synthetic aperture radar ( sar ) is one of important remote sensing radars used in many fields . sar image speckle reduction and compression is very important in enhancing the apprehension of sar image and in reducing the costs of data storage and transmission of sar image
  合成孔径雷达作为一种重要的遥感成像雷达在很多领域有广泛的应用，合成孔径雷达图像的相干斑噪声抑制和压缩算法对于提高图像的研究利用价值，以及数据的存储和传输效率是非常重要的问题。
• In the end , the part - magnetic - core pulse transformer is constructed with primary inductance 3 . 14 h , second inductance 298 . 89 h and coupling coefficient 0 . 873 . compared with the air - core spiral strip pulse transformer of the same dimension , the coupling coefficient is increased by 13 . 4 percent . this transformer is used to charge for water capacitor
  最终研制的部分磁芯带绕式脉冲变压器的初级电感为3 . 14 h ,次级电感为298 . 9 h ,次级输出电压在635kv以上,耦合系数为0 . 87 ,比相同结构尺寸的带绕式空芯脉冲变压器的耦合系数提高了13 . 4 % ,变比提高了20 % ,能量传输效率提高44 % 。
• With the development of network and multimedia technology , the application of the network video monitor system is more and more extensive . however , the network video monitor system often cannot adapted well to the high real - time requirement , and low - level efficiency of the video streaming transmission cannot satisfied the system requirement . all of the shortcoming limited the development of the network video monitor system all the time . the development of streaming media technology gives a chance to better solve this problem . we can send the sustained encapsulated video data stream to receiver according to the gradation of time by use of streaming media technology , and the receiver can play video streams received from network . it can improve systematic real - time character through adopting this method
  而一直以来网络监控系统的实时性不高和视频数据的网络传输效率低下等缺点限制了它的发展。流媒体技术的兴起较好的解决了这个问题,它将连续视频流封装后按照一定的时序要求发给接收端,保证接收端可以一边接收数据一边实时播放,提高了系统的实时性。本文以网络视频数据流为对象,研究了将流媒体技术应用于现代网络监控系统中的技术和实现方法。
• With the development of electronic technology in the field of high - frequency and high - power , power mosfet is gradually enhancing its important status in semiconductor apparatus and is being widely applied in power converters as switch . with the increasing of the operating frequency ( > 200khz ) , the energy loss caused by parasitic capacitance will affect the efficiency of power transforming in converters . especially in the applications of high frequency power supply using mosfet as main devices ( the unit of frequency is mhz ) , the energy loss caused by the switch process will badly affect its efficiency
  随着电力电子技术进一步向高频的大功率用电领域发展，功率mosfet在各种电力半导体器件中的重要地位日益显著，使用功率mosfet作为开关器件的功率转换电路也日益增多，但随着器件开关频率的提高(大于200khz ) ，由器件极间电容引起的能量损耗将会影响到功率转换电路的能量传输效率，特别是在以mosfet作为开关器件的高频感应加热电源中(工作频率可达兆赫) ， mosfet在开关过程中的能量损耗严重影响到电源的效率，因此如何减小开关器件的损耗提高高频功率转换线路的效率成为电力电子技术领域的重要研究课题之一。
• As a combination of ofdm with space - time coding technique , mimo - ofdm becomes more and more important in the future wireless communication systems , the mimo - ofdm system can not only effectively enhance the transmission rate and capacity of the wireless communication system but also greatly mitigate the effections of mufti - path fading and interfere
  Mimo - ofdm技术将ofdm与空时编码技术有机的结合在一起,能够大幅度的提高无线通信系统的信道容量和传输效率,并能有效的抵抗多径衰落、抑制干扰和噪声。
• Then by using aluminosilicate electrorheological fluid on the modeling device , experiments were carried out to uncover the variations of transmitting properties of four kinds of barriers surfaces with strips at inner surface , outer surface , neither and both surfaces under the same conditions , only to show that barriers surface with strips at both surfaces showed the best transmitting property on the erc
  在此基础上，以硅油-硅酸铝流体为er材料，通过实验重点探讨了四种不同界面形式下er离合器输出性能变化及其机理，表明内、外均加直条界面形式下er离合器输出性能较佳，且分析认为实验条件下内筒表面传输效率提高是引起er离合器传输性能增强的主要原因。
• Compared with current instruments , the setup can decrease disturbance of disorder radiation by using double layer refractive index sample matching vessel , and it can increase collecting and transmitting efficiency of radiation by adopting single mode fiber with gradient refractive index lens . with a low power laser , the sample has a low scathe , and the laser and the measurement system can be integrated conveniently
  与现有的同类型仪器相比，该仪器采用双层折射率样品匹配池减少了杂散光的干扰；采用带梯度折射率透镜的单模光纤接收、传输散射光信号提高了散射光的收集传输效率；用低强度的激光避免了对样品的辐射损伤，同时可以使激光器和系统集成在一起，整个系统小型实用。
• To supply the gap of current network protocol used in tele - medical monitoring systems , according to a complete life signal monitoring system based on mobile platform , this dissertation presents life signal wearable monitoring protocol . firstly , designing the proper format of data packet and control packet on the basis of life signal ’ s specialty to enhance the transmitting efficiency . secondly , describing the protocol in the method of formalization , designing the flow of the protocol and implementing it by coding . thirdly , analyzing the performance of the protocol on both local machine and lan , debugging and modifying the software to meet the require
  首先,根据生命信号的特点,本着提高传输效率的原则,设计了生命信号数据报文和控制报文的合理格式;其次,采用形式化方法对协议进行了描述,设计了协议的工作流程并编码实现;再次,在单机和网络环境下进行了性能分析,调试修改软件并使其达到设计要求。
• The termless security of quantum cryptographic key protocol is based on the quantum non - clone principle and heisenberg uncertainty principle . whilst , these two characteristics mentioned above contributes greatly to solve the problems of low transmitting rate , complicated operation and forge - identity assault in the bb84 protocol
  量子密钥协议的无条件安全性能主要建立在量子不可克隆定理和heisenberg的测不准原理两大理论基础上的，但也正是由于量子的这两种特性导致在bb84协议中存在了传输效率低下、操作复杂、假冒身份攻击等方面的问题。