L9200是一款ARM920T内核的工业级的开发板，CPU内嵌100M以太网，带有USB2.0协议的USB HOST和Device接口，支持SD卡、IIS音频和全功能9线串口等。主频180MHz，带有MMU存储器管理单元。性能稳定，功能强大，是工业控制、网络通讯等应用的首选。
ARM920T TM ARM
200 MIPS at 180 MHz Memory Management Unit
16-KByte Data Cache 16-KByte Instruction Cache Write Buffer
In-circuit Emulator including Debug Communication Channel
Mid-level Implementation Embedded Trace Macrocell (256-ball BGA Package Only) (2021-03-18, PDF, 9133KB, 下载0次)
OPC与西门子PLC通讯设置,调试,有三个文件
1.s7-200通过以太网模块和kepserver连接.pdf
2.s7-300与上位机通信.pdf
3.西门子S7与上位监控软件通讯(总结).pdf
OPC with Siemens PLC communication setting, debugging, there are three files
1. S7-200 through Ethernet module and kepserver connection. PDF
2. Communication s7-300 and the upper machine. PDF
3. Siemens S7 and upper monitor software communication (summary). PDF (2019-05-29, PDF, 243KB, 下载5次)
周琪老师纂写的基于虚拟极点验证极区导航算法的方法研究，提出了以赤道上任意一点为新极点的模拟极区验证极区间接格网导航的方法。并通过仿真验证了极区导航算法的性能。
The method of polar area navigation based on virtual pole validation compiled by Professor Zhou Qi is studied. A method of simulating polar area validation grid navigation with arbitrary point on the equator as new pole is proposed. The performance of polar navigation algorithm is verified by simulation. (2018-11-22, PDF, 1082KB, 下载1次)
系统总体设计，结合底层ZigBee无线传感网络的特点和系统总体网络监控的要求，将该系统设计分为四部分：无线传输模块、数据处理模块、以太网传输模块、上位机显示界面。
The system design is divided into four parts: the wireless transmission module, the data processing module, the Ethernet transmission module and the upper computer display interface, combined with the characteristics of the underlying ZigBee wireless sensor network and the requirements of the system overall network monitoring. (2018-05-29, PDF, 6624KB, 下载1次)
目前开源的网管软件众多，时间关系只能通过网络上的资料介绍和其他用户的体验进行评估。对于重点调查的开源软件通过运行环境搭建、开发环境搭建的方法进行实践
Currently many open source network management software, the time can only be assessed through presentations and other information on the user' s experience on the network. For major survey of open source software by running the built environment, development environment to build practice methods (2016-05-19, PDF, 307KB, 下载2次)
实时传输协议（Real- time Transport Protocol，PRT）是在Internet 上处理多媒体数据流的一
种网络协议，利用它能够在一对一（unicast，单播）或者一对多 （multicast，多播）的网
络环境中实现传流媒体数据的实时传输。RTP
Real-time Transport Protocol (Real-time Transport Protocol, PRT) in handling multimedia data streams on the Internet is a network protocol, it can use one (unicast, unicast) or many (multicast, multicast) of network environment to achieve real-time data transfer streaming media transmission. RTP (2013-09-12, PDF, 508KB, 下载4次)
本文设计了1.SMW双馈型风机变频器的整体硬件电路,满足风机整体工作的稳定
性和高效率"为实现LVRT功能,设计了一种新的CROWBAR电路,并对电路的控制
电路做了改进"研究了1.SMW双馈型风机变频器系统的控制策略,转子侧变换器采用
定子磁链定向矢量控制技术,网侧PWM变换器采用电网电压定向矢量控制技术,构建
了电流内环!电压外环的双闭环PI控制系统,导出了采用转子有功电流和无功电流独
立解祸来控制有功功率和无功功率的策略
This paper designs 1.SMW doubly-fed wind turbine inverter' s overall hardware circuit, meet fans overall stability and high efficiency " to achieve LVRT function, design a new CROWBAR circuit and control circuit of the circuit do improvement " study 1.SMW double-fed wind turbine inverter system control strategy, the rotor side converter using the stator flux oriented vector control technology, grid-side PWM converter using grid voltage oriented vector control technology to construct the inner current loop! Dual outer voltage loop PI control system is derived using the rotor active current and reactive current independent solutions Woe to the active and reactive power control strategy (2013-06-07, PDF, 7430KB, 下载61次)
w25q128 datasheet中文数据手册，本人翻译，希望对大家有所帮助。与W25Q64，W25Q16，W25Q32类似。
w25q128 datasheet (2010-08-09, PDF, 736KB, 下载897次)
Modbus 协议是应用于电子控制器上的一种通用语言。通过此协议，控制器相互之间、控制器经由网络（例如以太网）和其它设备之间可以通信。它已经成为一通用工业标准。有了它，不同厂商生产的控制设备可以连成工业网络，进行集中监控。
Modbus protocol is applied to electronic controller, a common language. Through this agreement, between the controller, the controller via the network (eg Ethernet) and other devices can communicate. It has become a common industry standard. With it, different manufacturers of industrial control equipment can be connected into a network of centralized control. (2010-07-07, PDF, 93KB, 下载1次)
介绍了时域有限差分法的基本原
理, 推导了二维棋份算法的。表达式, 对吸收边界条件工肠山网加、数值毯定性条件等
进行了说明, 并阐述了基于人们由软件编程的基本方法
Introduced the FDTD method the basic principles were derived algorithm for two-dimensional chess. Expression, work on absorbing boundary conditions net increase of intestinal Hill, numerical blanket qualitative conditions are described and elaborated on it by the basic method of software programming (2010-05-18, PDF, 58KB, 下载13次)
1stOpt 是七维高科有限公司（7D-Soft High Technology Inc.）独立开发，
拥有完全自主知识产权的一套数学优化分析综合工具软件包。在非线性回归，曲线拟合，非线性复杂模型参数估算求解，线性/非线性规划等领域首屈一指；
1stOpt 应用范围
1) 模型自动优化率定
2) 参数估算
3) 任意模型公式线性，非线性拟合，回归
4) 非线性连立方程组求解
5) 任意维函数，隐函数极值求解
6) 隐函数根求解，作图，求极值
7) 线性，非线性及整数规划
8) 组合优化问题
9) 高级计算器
附带指导文件
1stOpt Hi-Tech Co., Ltd. is one of the seven-dimensional (7D-Soft High Technology Inc.) Independently developed, have complete independent intellectual property rights of a set of integrated tools for analysis of mathematical optimization software package. In the non-linear regression, curve fitting, non-linear model parameters to estimate the complexity of solving linear/nonlinear programming in areas such as second to none 1stOpt scope of application 1) model to automatically optimize rate 2) parameter estimation 3) any model of the formula line sexual, non-linear fitting, regression 4) non-linear simultaneous equations to solve even 5) arbitrary-dimensional function, implicit function solving extremum 6) implicit function solving the root, mapping, and extreme value 7) of linear, non-linear and integer programming 8) combinatorial optimization problem 9) high-level guidance document attached calculator (2009-08-24, PDF, 7247KB, 下载289次)
行政办公管理系统、工作流效率管理系统、员工业绩档案系统、机构人员信息总图、工作博客系统、办公区域导航系统、项目信息管理系统、数据备份与灾备系统、物理隔离网闸、入侵监测系统、安全信息管理系统的维护、功能完善与扩展、配合甲方技术人员进行新系统的开发，并负责在合同履行期限内完成对甲方技术人员的培训，使甲方技术人员能够独立完成系统的运维与扩展工作。
infoplus (2009-02-03, PDF, 110KB, 下载11次)
CAN总线原理和应用系统设计-邬宽明
网评很好的一本书，电子版的很难找，CAN总线开发的经典教科书
Principle and Application of CAN Bus System Design- Wu Kuan-ming network assessment a very good book, the electronic version of the hard to find, CAN Bus development of the classic textbook (2008-08-26, PDF, 6361KB, 下载720次)
本书在全面介绍ARM处理器的体系结构、编程模型、指令系统和开发工具的同时，以Samsung公司的一款基于以太网系统的ARM处理器－S3C4510B为核心，详细讲解系统的设计、调试，以及相关的软件设计和嵌入式操作系统的移植、应用程序的开发、设备驱动程序的开发过程。
This book in a comprehensive introduction to ARM processor architecture, programming model, instruction set and development tools at the same time, to Samsung, a company (2008-03-11, PDF, 3755KB, 下载5次)
提出基于格网划分的实时LOD 分层方法, 该方法基于DEM 和影像数据固有的栅格特点, 使用简单的几何算法即可实现DEM 数据的动态分层, 计算量小, 可实现对大数据集DEM 数据的实时漫游.
Grid based on the division of real-time LOD stratification method based on DEM and raster image data inherent characteristics, the use of simple geometric algorithm can be realized DEM data dynamic layering, a small amount of calculation can be realized for large data sets DEM data in real-time roaming. (2007-12-20, PDF, 345KB, 下载43次)
本分布式小区智能网络模型采用符合现场总线(Fieldbus)要求
的CAN技术，以带CAN总线端口的主控机和单元控制器CAN端接口构成的
CAN网络层，下层为由带RS485端口的住户采集器和单元控制器RS485端
接口构成了RS485网络层，向上则利用PC机连接CAN网络层，作为智能
化小区管理中心，从而基本实现智能小区管理、控制、报警、信息采
集和自我检测的功能。
本文从智能小区、现场总线、CAN技术到“CAN+RS485”双底层网
络模型的软、硬件研究，较为详细的介绍了其设计、调试运行和期间
各种问题的解决。
The Distributed Intelligent Network model district in line with Fieldbus (Fieldbus) requirements CAN technologies to bring CAN bus port主控机and cell controller CAN-side interface consisting of CAN network layer, the lower the grounds with RS485 port Household acquisition and cell controller interface RS485 client constitutes a RS485 network layer, up modem to connect to the PC using the CAN network layer, as the Intelligent Community Management Center in order to realize the basic intelligent community management, control, alarm, information collection and self-testing function. This article from the Intelligent Community, Fieldbus, CAN technology to (2007-08-12, PDF, 1897KB, 下载46次)
ims技术基础，ZTE资料。
1.IMS引入
从需求角度
从竞争角度
从标准角度
2.IMS技术纵览
IMS及其特点
IMS框架及实体
IMS协议
IMS编号
IMS流程
IMS业务
IMS组网
IMS计费
3.问题与思考
ims technical basis, ZTE information. 1.IMS introduction from the angle of demand from the perspective of competition from the standard technology overview perspective 2.IMS (2007-06-15, PDF, 5103KB, 下载132次)
本文简要介绍了集成电路MAX038的性能，并给出了以MAX038波形产生器为核心具有四种输出波形的函数
信号发生器的设计方案。用这种方法设计的信号发生器具有结构简单、成本低、体积小等特点，很好地满足
了一般的实验要求。
关键词：集成电路 信号发生器 频率
Abstract：The performance ofIC_MAX038 was introduced briefly in this paper．At the sa／ne time，a signal generator design making
with integrated circuit MAX038 is provided，which can produce four kinds of waveforms output．The signal generator
was of characters such as simple structur，cheap expense，small volume and SO on．The signal generator contents the
demand of general experiments very wel1．
Key words：Integrated circuit Signal generator Frequency
This paper describes the MAX038 IC performance and gives a MAX038 waveform generator for the four core output waveform is a function of the signal generator design . This way the signal generator design is simple, low cost, small size and other characteristics, good to meet the general requirements of the experiment. Keywords : frequency signal generator IC Abstract : The performance was introduced br ofIC_MAX038 iefly in this paper. At the sa/ne time, a signal generator design making with integrat ed circuit MAX038 is provided, which can produce four kinds of waveforms outpu t. The signal generator was of characters such as s imple structur, cheap expense. small volume and SO on. The signal generator contents of the demand gen eral experiments very wel1. Key words : Integrated circuit S (2007-01-17, PDF, 185KB, 下载194次)
传真通信国家标准，相当于ITU - T T.30协议。文件传真三类机在电话网中的互通技术条件 第2部分：在公用电话交换网上的文件传真传输规程
fax communications standards, equivalent to the ITU-T 7-9-2 agreement. Three categories of documents by fax machine telephone network in the exchange of technical conditions Part 2 : the Public Switched online documents by fax transmission order (2006-05-30, PDF, 4794KB, 下载148次)
如何成功的运用OPENH323 来开发商业的H.323 协议栈 Openh323 有以下的特征： 1>动态的静音检测算法, 以减小语音包的传输量。 2>支持Windows，Linux 和FreeBSD 的多种客户端命令。 3>包含有MCU，PSTN 网关，和自动语音应答机等多种应用平台。 4>软件支持GSM，LPC-10，G.711 uLaw/Alaw 软件编解码方式。 5>特定硬件（Quicknet/LineXJ）支持G.723.1, G.728 和 G.729 。 6>采用Jitter Buffer 技术对语音信号做接受的缓冲处理。 7>软件产生舒适噪音。 8>采用H.261 视频压缩协议。 9>支持广播的方式查找网守（GateKeeper）。 10>支持H.235 附件D 中和网守的身份认证。(部分地支持H.235) 11>支持部分H.450 补充协议。
How successful the use of OpenH323 to develop commercial H.323 (2004-07-03, PDF, 385KB, 下载363次)