查询词典 location

At the same time, combining with the actual condition of delivery pipeline of our country and some prevalent leak detection and location methods, this paper raised a method, which is based on wavelet analysis and negative- pressure-wave to detect and locate the leakage. Jobs in the paper are as follows:As affected by gas density, pressure, specific heat and pipe material, the velocity of negative-pressure-wave improved depending on the energy conservation. At one time, taking the affection of velocity of gas flow, the location formula was modified in some degree.When locating the leaks with location formula, the iterative approach algorithm was adopted as a new method to increase the location accuracy level of system.Multi-scale decomposition and reconstruction of wavelet transform is utilized to filter the noise of negative-pressure-wave, which was brought by leakage. With the capacity to detect the signal singularity fast and accurately, wavelet transform was used to catch the break point of pressure signal. The work improved the accuracy of At in location formula, accordingly improved the location accuracy.Wavelet is a suitable tool for signal analysis. The distinct character is that the mother-wavelet is of optional. That means choosing different mother-wavelet will get different analysis result. So we studied how to choose mother-wavelet and its scale for signal singularity detection. The method is to choose a wavelet by regularities of the wavelet and the signal.Finally, a plan, which bases on SCADA system for inspection and detection of natural gas leakage, is proposed in the article.

其中，主要进行了以下几方面的工作：针对泄漏产生的负压波在管道中的传播速度受媒介的密度、压力、比热及材质等因素的影响，而非声波在空气中传播的速度，本文利用能量守恒原理，对其进行了修正；考虑到管内气体流速对压力波速的影响，对原始的负压波定位公式进行了一定程度的改进，并在利用定位公式进行泄漏点定位时采用逐步迭代逼近算法，提高了系统的定位精度；利用小波变换的多分辨率分解和重构技术，对采集到的管道发生泄漏时产生的负压波信号进行了降噪处理；并利用小波变换技术对信号奇异点的快速、准确的识别能力，对经上述消噪后的负压波信号进行了奇异点捕捉，精确捕捉的结果提高了定位公式中上下游站点采集到的负压波奇异点的时间差△t的精度，从而进一步提高了定位的精度；考虑到小波变换是一种基波可变的信号分析工具，也就是说，不同的小波基波对信号分析的结果将有很大差别，这势必影响最终的处理结果，因此，我们又对比分析了本课题中小波基及尺度的选择问题，依据规则性系数相似性原理对母小波的选择进行了探索性研究；最后，还提出了基于SCADA的泄漏检测与定位系统的软件开发构想及系统的嵌入方案。

node location is one of the key technologies in wireless sensor network.rssi－based location is a hotspot in nowadays.for resolving biggish error in rssi－based location,the paper presents a new method of location,rssi－based triangle and centroid location,using triangle and centroid method to reduce the error of rssi measurement.simulation experiments prove that this algorithm can obviously improve the location accuracy compared to trilateration.

摘 要：节点定位是无线传感器网络中的关键技术之一。基于rssi的定位技术是现阶段研究的热点，为解决rssi测量方法定位误差较大的问题，提出一种将rssi测量方法与三角形质心算法相结合的新型定位算法，该算法用三角形质心算法减小rssi的测量误差。仿真表明该算法比基于rssi的三边测量法定位算法的定位精度有较大提高。

The category location of Xi'an Shiyou University:teaching university; hierarchy location of running the school: give priority to undergraduate course, positively develop postgraduate course; special subject location: focus on project, take petroleum and petrify as characteristic, theory、project、economy、manage、literature、law、education more subjects develop harmonizly; cultivate talent location: culture strong basic、take delight in dedicatory appliance advanced special man that petroleum interest and area economy society need; service location: depend on petroleum,base on shan xi, facing to the western, serve nationwide.

西安石油大学学校类型定位：教学研究型大学；办学层次定位：以本科教育为主，积极发展研究生教育；学科专业定位：以工为主，以石油石化为特色，理、工、经、管、文、法、教多学科协调发展；人才培养定位：培养石油行业和区域经济社会发展需要的基础扎实、乐于奉献的应用型高级专门人才；服务面向定位：依托石油，立足陕西，面向西部，服务全国。

The main thrust of this dissertation is to develop the Application Specific Integrated Circuit of location identification for Wireless Sensor Network and to analyze the capability of location identification in existing hardware. Beside, this thesis will discuss a number of the location identification methods, such as TDOA, TOA and AOA, etc. By utilizing the time interval of propagating signal as my basic location identification parameter, this thesis examines the suitable location identification methodology based on the Wireless Sensor Network configuration developed within NTU. Some preliminary tests were performed to verify the performance of the newly developed system.

本论文主要目的在於开发适用於无线感测器网路的定位晶片和分析定位功能於现有硬体架构下之可行性，首先本论文中将介绍各种定位方法如TDOA、TOA和AOA等等，最终以量测无线电讯号於空气中传播之时间间隔作为定位架构的基本参数，并试著针对本实验室无线感测器网路的架构寻找适合的定位方式，并进行初步的测试。

The method of obtaining time delay parameters with the reverse access channel is discussed. The modified algorithms of classic correlation methods of TOA estimation are proposed. Noncoherently combining algorithm and group coherent combining algorithm are given. They decrease the computational complexity and are more suitable for implementations in practical systems. The leading edge detection algorithm is proposed to mitigate the effect of multipath in TOA estimation. Then the secondary search method is proposed, it can solve the matching issue of PN code in CDMA systems. The location algorithms based on LS are discussed; include circular trilateration with LS, hyperbolic trilateration with reference differencing, hyperbolic trilateration with sequential differencing and circular trilateration with TOA differences. The design and implementation of wireless location system based on TOA/TDOA in CDMA2000 systems are given. The location process is discussed, and the hardware and software implementation of TOA estimation are given. Finally, the wireless location system which uses TOA estimation and LS location algorithms above is tested in the real environment.

文中讨论了采用CDMA2000反向链路中的接入信道来获取时延的方法和过程；对TOA估计的传统的相关法进行了改进，提出了非相干合并相关法和分组合并相关法，减少了基于相关的时延估计算法的运算量，提高了算法的实用性，对算法进行了仿真和性能分析；采用边缘检测技术有效减少了TOA参数估计中的多径干扰，提高了时延参数估计的准确度；提出了一种TOA估计的二次搜索法，解决了多个定位测量单元同时进行TOA估计的PN码匹配问题，进一步了提高TOA估计的精度；在采用时延值的定位算法中引入了基于LS的圆周法、基于参考差的双曲线法、基于相邻差的双曲线法和基于TDOA的圆周法，讨论了各算法的应用条件，进行了算法性能的仿真分析；给出了CDMA2000系统中的TOA/TDOA的无线定位的系统方案和实现流程，并对TOA值估计算法进行了软硬件实现，还对采用TOA估计算法、LS定位算法和定位系统设计方案实现的定位系统的进行了现场定位性能测试。

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开始里程碑===== 0x945e3c8 2008/03/11 17：02：35.7189 ：调试日志倾倒由于信号11日=====完里程碑==========开始环形缓冲区===== 0x945e3c8 2008/03/11 14：41：03.1538 ：窗口0x9510840开放地点：旧=""，新=的" X鹦鹉螺-桌面说：" 0x945e3c8 2008/03/11 14：41：07.4960 ：成品装载窗口0x9510840 ：的X鹦鹉螺-桌面： 0x945e3c8 2008/03/11 15：44：48.0181 ：选择改变窗口0x9510840 的X鹦鹉螺-桌面：///垃圾桶 0x945e3c8 2008/03/11 15：44：52.1769 ：选择改变窗口0x9510840 的X鹦鹉螺-桌面：///主页 0x945e3c8 2008/03/11 15：45：50.2681 ：目录浏览open_location窗口= 0xb1f02890 ：档案：///家/恒/％类％ b8 ％ 8B条％，并可％屋宇署％屋宇署 0x945e3c8 2008/03/11 15：45：50.2681 ：窗口0xb1f02890开放地点：旧="档案：///主页/衡"，新="档案：///家/恒/％类％ b8 ％ 8B条％，并可％屋宇署％屋宇署" 0x945e3c8 2008/03/11 15：45：50.2860 ：窗口0xb1f02960开放地点：旧=""，新="档案：///家/恒/％类％ b8 ％ 8B条％，并可％屋宇署％屋宇署" 0x945e3c8 2008/03/11 15：45：50.2864 ：当前新的空间窗口= 0xb1f02960 ：档案：///家/恒/％类％ b8 ％ 8B条％，并可％屋宇署％屋宇署 0x945e3c8 2008/03/11 15：45：50.6858 ：成品装载窗口0xb1f02960 ：档案：///家/恒/％类％ b8 ％ 8B条％，并可％屋宇署％屋宇署 0x945e3c8 2008/03/11 15：45：51.2669 ：选择改变窗口0xb1f02960 档案：///家/恒/％类％ b8 ％ 8B条％，并可％屋宇署％屋宇署/ temp.rar 0x945e3c8 2008/03/11 15：45：53.4393 ：删除档案：档案：///家/恒/％类％ b8 ％ 8B条％，并可％屋宇署％屋宇署/ temp.rar 0x945e3c8 2008/03/11 15：45：53.6466 ：选择改变窗口0xb1f02960 0x945e3c8 2008/03/11 15：48：31.7278 ：选择改变窗口0xb1f02960 档案：///家/恒/％类％ b8 ％ 8B条％，并可％屋宇署％屋宇署/ temp.rar 0x945e3c8 2008/03/11 15：53：50.3606： fm_directory_view_activate_files窗口= 0x9510840 的X鹦鹉螺-桌面：///主页 0x945e3c8 2008/03/11 15：53：50.3658 ：目录浏览open_location窗口= 0x9510840 ：档案：///主页/珩 0x945e3c8 2008/03/11 15：53：50.3659 ：窗口0x9510840开放地点：旧="的X鹦鹉螺-桌面："，新="档案：///家/恒" 0x945e3c8 2008/03/11 15：53：50.3660 ：目前现有的空间窗口= 0xb1f02890 ：档案：///主页/珩 0x945e3c8 2008/03/11 15：53：52.2887： fm_directory_view_activate_files窗口= 0xb1f02890 档案：///家/恒/％类％ b8 ％ 8B条％，并可％屋宇署％屋宇署 0x945e3c8 2008/03/11 15：53：52.2891 ：目录浏览=====完环形缓冲区=====此配置为调试日志，可以再创造把下列/鹦鹉螺-调试- log.conf （使用'；'分开域名）：最大值线= 1000 我帮你翻译了这么多，你才给我5分，我亏死了，再给我加30还差不多可以不下次我可以帮你的

Based on the existed research, the study found that the selection of these subjects have rarely been studied, so the selection of this theme has significance in the information society geography theory and can rich the tourist sites in geography study and can guide new thoughts. The second part discusses distance decay effects in web sever when attenuation theory be chose in electronic age location. It considers 7 factors: knowledge spillover environment and yi to technological innovation information reaches nature, decision-maker behavior,human capital factor, supply chain environment, yi to the developed communication net and network of communication lines reaches nature, agglomeration factor, commercial and trade circumstance. Part three studies location significance of outdoor sports websites. Though investigating and analyzing our country 30 cities's outdoor sports websites in China, the author gives out the location characteristics of outdoor sports websites in actual geographical space, and take Shijiazhuang for example, the author analyzes the stadiums gathering effection to the outdoor sports websites which are near the stadiums, and dividing the location into gathering area and non-gathering area the author studies the effects for information flow guiding people flow. Part four is the conclusion which includes four conclusions reached by this article.

在国内外已有研究的基础上，发现本文的选题在国内外研究中基本处于空白状态，对于丰富信息社会地理学理论及引导旅游网站在地理学的研究新思维有重要意义；第二部分论述了服务器距离衰减原理在电子服务区位选择中的作用，并分别从知识溢出环境和对技术创新信息的易达性、决策者行为、人力资本因素、供应链环境、对发达通讯网和交通网的易达性、集聚因素和经济贸易因素七个方面进行考量；第三部分通过对我国30个城市的户外运动网站地址进行调查分析，总结出户外运动网站在实际空间分布上的区位特征，并对聚集区与非聚集区的区位在信息流导引人流中的作用—以石家庄市户外运动网站受临近体育场聚集效应的影响为例，作了实证分析；第四部分为结论，总结了本文研究所得出的四点结论。

Location-inventory system integrated design problem under stochastic demand The location-inventory distribution system design problem involving one supplier, candidate distribution centers and multiple retailers under normal distribution demand is studied in the background of building materials industry. Retailers adopt periodic reviewinventory policy, while distribution centers adopt continuous reviewinventory policy. Considering the trade-off between inventory cost, shipping cost and facility location cost, the integrated 2-echelon inventory control policies with incapacitated facility location model is presented.

随机客户需求下的选址-库存集成问题研究：以满足正态分布客户需求的型材配送物流为研究背景，研究了由单供应商、候选分拨中心和分销点构成的配送物流系统集成规划问题，分销点、分拨中心分别采用周期检查和连续检查库存控制策略，综合考虑库存成本、运输成本和设施成本之间的均衡关系，建立了二级库存控制策略与无能力约束选址集成规划模型。

It predicts and updates the locations of each mobile hosts properly using proactive way.It makes every host acquire other nodes' location information in its extrapolative location table.It can help some kinds of location aided routing protocols that has the need to know accurate location information in entire areas in getting optimal performance.

该协议采用先应式方法对各移动节点的位置进行预测和适当更新，使各移动节点能够在本节点的外推位置信息表中随时了解网络中其他节点的位置信息，特别适用于几种需要获得较精确的全局节点位置信息的位置辅助型路由协议。

The location of university is the procession of the "preparation", this preparation is also manifested the forwarning trait of higher education, in this paper, we want to discuss theories of the location of universities, and that, discussing theories is always started from the basic concept, therefore, at first, we clarified the concept such as university, location and the location of university.

本文旨在探讨大学定位的相关理论，而探讨理论往往是从其最基本的概念开始的，所以文章首先对大学、定位、大学定位等几个基本的概念进行厘清。

After explaining total design of automated test system for microcircuit , the thesis introduces GPIB standard .

文章在说明了微电路模块自动测试系统的总体设计后，对GPIB标准进行了介绍。

He interceded in my behalf.

他替我说情。