The Software Engineering Institute’s (SEI) Capability Maturity Model (CMM) provides a well-known benchmark of software process maturity. The CMM has become a popular vehicle for assessing the maturity of an organization’s software process in many domains. This white paper describes how the Rational Unified Process can support an organization that is trying to achieve CMM Level-2, Repeatable, and Level-3, Defined, software process maturity levels.
標(biāo)簽: Engineering Capability well-known Institute
上傳時間: 2017-02-27
上傳用戶:zhichenglu
漢語詞法分析系統(tǒng)ICTCLAS(Institute of Computing Technology, Chinese Lexical Analysis System),該系統(tǒng)的功能有:中文分詞;詞性標(biāo)注;未登錄詞識別。分詞正確率高達(dá)97.58 (973專家組評測),未登錄詞識別召回率均高于90 ,其中中國人名的識別召回率接近98 處理速度為31.5Kbytes/s。ICTCLAS的特色還在于:可以根據(jù)需要輸出多個高概率結(jié)果,有多種輸出格式,支持北大詞性標(biāo)注集,973專家組給出的詞性標(biāo)注集合。該系統(tǒng)得到了專家的好評,并有多篇論文在國內(nèi)外發(fā)表。
標(biāo)簽: Technology Computing Institute Analysis
上傳時間: 2013-12-24
上傳用戶:ANRAN
LwIP是瑞士計算機科學(xué)院(Swedish Institute of Computer Science)的AdamDunkels等開發(fā)的一套用于嵌入式系統(tǒng)的開放源代碼TCP/IP協(xié)議棧。LwIP的含義是Light Weight(輕型)IP協(xié)議。LwIP可以移植到操作系統(tǒng)上,也可以在無操作系統(tǒng)的情況下獨立運行。LwIP協(xié)議的基礎(chǔ)是在減少對硬件資源占用的前提下完成TCP/IP協(xié)議的主要功能
標(biāo)簽: LwIP AdamDunkels Institute Computer
上傳時間: 2014-11-04
上傳用戶:love1314
this is the research book for the prestige Institute of management gwalior
標(biāo)簽: management Institute the research
上傳時間: 2017-04-19
上傳用戶:zaizaibang
Analysis and Simulation of UHF RFID System Jin Li, Cheng Tao Modern Telecommunication Institute, Beijing Jiaotong University, Beijing 100044, P. R. China Abstract This article presents the analysis and simulation of UHF RFID system
標(biāo)簽: Telecommunication Simulation Institute Analysis
上傳時間: 2013-12-21
上傳用戶:從此走出陰霾
偽隨機序列 (Pseudo-Random Sequence,PRS)廣泛應(yīng)用于密碼學(xué)、擴頻通信、雷達(dá)、導(dǎo)航等領(lǐng)域,其設(shè)計和分析一直是國際上的研究熱點。混沌序列作為一種性能優(yōu)良的偽隨機序列,近年來受到越來越多的關(guān)注。尋找一種性能更為良好的混沌偽隨機序列(ChaosPseudo Random Sequence,CPRS)并且完成其硬件實現(xiàn),在理論研究與工程應(yīng)用上都是十分有價值的。基于切延遲橢圓反射腔映射混沌系統(tǒng)(Tangent-Delay Ellipse Reflecting Cavity map System,TD-ERCS)已被理論分析和測試證明具有良好的密碼學(xué)性質(zhì)。本文介紹了一種基于TD-ERCS構(gòu)造偽隨機序列發(fā)生器 (Pseudo Random SequenceGenerator,PRSG)的新方法;并基于這種方法,提出了以現(xiàn)場可編程門陣列 (Field Programmable Gate Array,F(xiàn)PGA)為平臺的硬件設(shè)計實現(xiàn)方案,采用硬件描述語言 (VHSIC Hardware DescriptionLanguage,VHDL )完成了整個系統(tǒng)的設(shè)計,通過了仿真與適配,完成了硬件調(diào)試;詳細(xì)地論述了系統(tǒng)總體框架及內(nèi)部模塊設(shè)計,重點介紹了TD-ERCS算法實現(xiàn)單元的設(shè)計,并在系統(tǒng)中設(shè)計加入了異步串行接口,完善了整個系統(tǒng)的模塊化,可使系統(tǒng)嵌入到現(xiàn)有的各類密碼系統(tǒng)與設(shè)備中;基于FDELPHI編程環(huán)境,完成了計算機應(yīng)用軟件的設(shè)計,為使用基于TD-ERCS開發(fā)的PRSG硬件產(chǎn)品提供了人機交互界面,也為分析與測試硬件系統(tǒng)產(chǎn)生的CPRS提供了方便;同時依據(jù)美國國家標(biāo)準(zhǔn)與技術(shù)研究院 (National Institute of Standards andTechnology,NIST)提出的偽隨機序列性能指標(biāo),對軟件與硬件系統(tǒng)產(chǎn)生的CPRS進(jìn)行了標(biāo)準(zhǔn)測試,軟件方法所得序列各項性能指標(biāo)完全合格,硬件FPGA所得序列僅三項測試未能通過,其原因有待進(jìn)一步研究。
上傳時間: 2013-06-20
上傳用戶:heart520beat
電路分析基礎(chǔ)電路分析基礎(chǔ)Fundamentals of Electric CircuitsFundamentals of Electric Circuits多媒體教學(xué)課件多媒體教學(xué)課件北京理工大學(xué)北京理工大學(xué)Beijing Institute of TechnologyBeijing Institute of Technology 目錄•第一章集總電路中電壓、電流的約束關(guān)系•第二章運用獨立電流、電壓變量的分析方法•第四章分解法及單口網(wǎng)絡(luò)•第三章疊加方法與網(wǎng)絡(luò)函數(shù)•第六章電容元件和電感元件•第七章一階電路•第八章二階電路•第十章正弦穩(wěn)態(tài)功率和能量三相電路•第九章阻抗與導(dǎo)納•第十一章電路的頻率響應(yīng)•第十二章耦合電感和理想變壓器
標(biāo)簽: 電路分析基礎(chǔ)
上傳時間: 2013-11-10
上傳用戶:asdstation
Integrated EMI/Thermal Design forSwitching Power SuppliesWei ZhangThesis submitted to the Faculty of theVirginia Polytechnic Institute and State Universityin partial fulfillment of the requirements for the degree of Integrated EMI/Thermal Design forSwitching Power SuppliesWei Zhang(ABSTRACT)This work presents the modeling and analysis of EMI and thermal performancefor switch power supply by using the CAD tools. The methodology and design guidelinesare developed.By using a boost PFC circuit as an example, an equivalent circuit model is builtfor EMI noise prediction and analysis. The parasitic elements of circuit layout andcomponents are extracted analytically or by using CAD tools. Based on the model, circuitlayout and magnetic component design are modified to minimize circuit EMI. EMI filtercan be designed at an early stage without prototype implementation.In the second part, thermal analyses are conducted for the circuit by using thesoftware Flotherm, which includes the mechanism of conduction, convection andradiation. Thermal models are built for the components. Thermal performance of thecircuit and the temperature profile of components are predicted. Improved thermalmanagement and winding arrangement are investigated to reduce temperature.In the third part, several circuit layouts and inductor design examples are checkedfrom both the EMI and thermal point of view. Insightful information is obtained.
標(biāo)簽: EMI 開關(guān)電源 英文
上傳時間: 2013-11-10
上傳用戶:1595690
CAN與RS232轉(zhuǎn)換節(jié)點的設(shè)計與實現(xiàn) 介紹將CAN總線接口與RS232總線接口相互轉(zhuǎn)換的設(shè)計方法和2種總線電平轉(zhuǎn)換關(guān)系,實現(xiàn)CAN總線與各模塊的接口設(shè)計,制定了相應(yīng)的軟硬件設(shè)計方案,并給出軟件設(shè)計流程圖以及部分硬件設(shè)計原理圖。為CAN總線與RS232總線互聯(lián)提供了一種方法,對CAN總線與RS232總線接口設(shè)備的互聯(lián)和廣泛應(yīng)用的實現(xiàn)具有重要意義。關(guān)鍵詞:CAN總線;RS-232總線;串行通信Design and Realization of CAN and RS232 Transformation NodeZHOU Wei, CHENG Xiao-hong(Information Institute, Wuhan University of Technology, Wuhan 430070)【Abstract】This paper introduces one design method of the CAN bus interface and the RS232 bus interface interconversion, emphasizes two kindof bus level transformation relations, realizes the CAN bus and various modules connection design, formulates the design proposal of correspondingsoftware and hardware, and gives the flow chart of software design as well as the partial schematic diagram of hardware design. It providesonemethod for the CAN bus and the RS232 bus interconnection, has the vital significance to widespread application realization of the CAN busand theRS232 bus interface equipment interconnection.【Key words】CAN bus; RS-232 bus; serial communication
標(biāo)簽: CAN 232 RS 轉(zhuǎn)換
上傳時間: 2013-11-04
上傳用戶:leesuper
很多不同的廠家生產(chǎn)各種型號的計算機,它們運行完全不同的操作系統(tǒng),但TCP.IP協(xié)議族允許它們互相進(jìn)行通信。這一點很讓人感到吃驚,因為它的作用已遠(yuǎn)遠(yuǎn)超出了起初的設(shè)想。T C P / I P起源于6 0年代末美國政府資助的一個分組交換網(wǎng)絡(luò)研究項目,到9 0年代已發(fā)展成為計算機之間最常應(yīng)用的組網(wǎng)形式。它是一個真正的開放系統(tǒng),因為協(xié)議族的定義及其多種實現(xiàn)可以不用花錢或花很少的錢就可以公開地得到。它成為被稱作“全球互聯(lián)網(wǎng)”或“因特網(wǎng)(Internet)”的基礎(chǔ),該廣域網(wǎng)(WA N)已包含超過1 0 0萬臺遍布世界各地的計算機。本章主要對T C P / I P協(xié)議族進(jìn)行概述,其目的是為本書其余章節(jié)提供充分的背景知識。 TCP.IP協(xié)議 縮略語 ACK (ACKnowledgment) TCP首部中的確認(rèn)標(biāo)志 API (Application Programming Interface) 應(yīng)用編程接口 ARP (Address Resolution Protocol) 地址解析協(xié)議 ARPANET(Defense Advanced Research Project Agency NETwork) (美國)國防部遠(yuǎn)景研究規(guī)劃局 AS (Autonomous System) 自治系統(tǒng) ASCII (American Standard Code for Information Interchange) 美國信息交換標(biāo)準(zhǔn)碼 ASN.1 (Abstract Syntax Notation One) 抽象語法記法1 BER (Basic Encoding Rule) 基本編碼規(guī)則 BGP (Border Gateway Protocol) 邊界網(wǎng)關(guān)協(xié)議 BIND (Berkeley Internet Name Domain) 伯克利I n t e r n e t域名 BOOTP (BOOTstrap Protocol) 引導(dǎo)程序協(xié)議 BPF (BSD Packet Filter) BSD 分組過濾器 CIDR (Classless InterDomain Routing) 無類型域間選路 CIX (Commercial Internet Exchange) 商業(yè)互聯(lián)網(wǎng)交換 CLNP (ConnectionLess Network Protocol) 無連接網(wǎng)絡(luò)協(xié)議 CRC (Cyclic Redundancy Check) 循環(huán)冗余檢驗 CSLIP (Compressed SLIP) 壓縮的S L I P CSMA (Carrier Sense Multiple Access) 載波偵聽多路存取 DCE (Data Circuit-terminating Equipment) 數(shù)據(jù)電路端接設(shè)備 DDN (Defense Data Network) 國防數(shù)據(jù)網(wǎng) DF (Don’t Fragment) IP首部中的不分片標(biāo)志 DHCP (Dynamic Host Configuration Protocol) 動態(tài)主機配置協(xié)議 DLPI (Data Link Provider Interface) 數(shù)據(jù)鏈路提供者接口 DNS (Domain Name System) 域名系統(tǒng) DSAP (Destination Service Access Point) 目的服務(wù)訪問點 DSLAM (DSL Access Multiplexer) 數(shù)字用戶線接入復(fù)用器 DSSS (Direct Sequence Spread Spectrum) 直接序列擴頻 DTS (Distributed Time Service) 分布式時間服務(wù) DVMRP (Distance Vector Multicast Routing Protocol) 距離向量多播選路協(xié)議 EBONE (European IP BackbONE) 歐洲I P主干網(wǎng) EOL (End of Option List) 選項清單結(jié)束 EGP (External Gateway Protocol) 外部網(wǎng)關(guān)協(xié)議 EIA (Electronic Industries Association) 美國電子工業(yè)協(xié)會 FCS (Frame Check Sequence) 幀檢驗序列 FDDI (Fiber Distributed Data Interface) 光纖分布式數(shù)據(jù)接口 FIFO (First In, First Out) 先進(jìn)先出 FIN (FINish) TCP首部中的結(jié)束標(biāo)志 FQDN (Full Qualified Domain Name) 完全合格的域名 FTP (File Transfer Protocol) 文件傳送協(xié)議 HDLC (High-level Data Link Control) 高級數(shù)據(jù)鏈路控制 HELLO 選路協(xié)議 IAB (Internet Architecture Board) Internet體系結(jié)構(gòu)委員會 IANA (Internet Assigned Numbers Authority) Internet號分配機構(gòu) ICMP (Internet Control Message Protocol) Internet控制報文協(xié)議 IDRP (InterDomain Routing Protocol) 域間選路協(xié)議 IEEE (Institute of Electrical and Electronics Engineering) (美國)電氣與電子工程師協(xié)會 IEN (Internet Experiment Notes) 互聯(lián)網(wǎng)試驗注釋 IESG (Internet Engineering Steering Group) Internet工程指導(dǎo)小組 IETF (Internet Engineering Task Force) Internet工程專門小組 IGMP (Internet Group Management Protocol) Internet組管理協(xié)議 IGP (Interior Gateway Protocol) 內(nèi)部網(wǎng)關(guān)協(xié)議 IMAP (Internet Message Access Protocol) Internet報文存取協(xié)議 IP (Internet Protocol) 網(wǎng)際協(xié)議 I RTF (Internet Research Task Force) Internet研究專門小組 IS-IS (Intermediate System to Intermediate System Protocol) 中間系統(tǒng)到中間系統(tǒng)協(xié)議 ISN (Initial Sequence Number) 初始序號 ISO (International Organization for Standardization) 國際標(biāo)準(zhǔn)化組織 ISOC (Internet SOCiety) Internet協(xié)會 LAN (Local Area Network) 局域網(wǎng) LBX (Low Bandwidth X) 低帶寬X LCP (Link Control Protocol) 鏈路控制協(xié)議 LFN (Long Fat Net) 長肥網(wǎng)絡(luò) LIFO (Last In, First Out) 后進(jìn)先出 LLC (Logical Link Control) 邏輯鏈路控制 LSRR (Loose Source and Record Route) 寬松的源站及記錄路由 MBONE (Multicast Backbone On the InterNEt) Internet上的多播主干網(wǎng) MIB (Management Information Base) 管理信息庫 MILNET (MILitary NETwork) 軍用網(wǎng) MIME (Multipurpose Internet Mail Extensions) 通用I n t e r n e t郵件擴充 MSL (Maximum Segment Lifetime) 報文段最大生存時間 MSS (Maximum Segment Size) 最大報文段長度 M TA (Message Transfer Agent) 報文傳送代理 MTU (Maximum Transmission Unit) 最大傳輸單元 NCP (Network Control Protocol) 網(wǎng)絡(luò)控制協(xié)議 NFS (Network File System) 網(wǎng)絡(luò)文件系統(tǒng) NIC (Network Information Center) 網(wǎng)絡(luò)信息中心 NIT (Network Interface Tap) 網(wǎng)絡(luò)接口栓(S u n公司的一個程序) NNTP (Network News Transfer Protocol) 網(wǎng)絡(luò)新聞傳送協(xié)議 NOAO (National Optical Astronomy Observatories) 國家光學(xué)天文臺 NOP (No Operation) 無操作 NSFNET (National Science Foundation NETwork) 國家科學(xué)基金網(wǎng)絡(luò) NSI (NASA Science Internet) (美國)國家宇航局I n t e r n e t NTP (Network Time Protocol) 網(wǎng)絡(luò)時間協(xié)議 NVT (Network Virtual Terminal) 網(wǎng)絡(luò)虛擬終端 OSF (Open Software Foudation) 開放軟件基金 OSI (Open Systems Interconnection) 開放系統(tǒng)互連 OSPF (Open Shortest Path First) 開放最短通路優(yōu)先 PAWS (Protection Against Wrapped Sequence number) 防止回繞的序號 PDU (Protocol Data Unit) 協(xié)議數(shù)據(jù)單元 POSIX (Portable Operating System Interface) 可移植操作系統(tǒng)接口 PPP (Point-to-Point Protocol) 點對點協(xié)議 PSH (PuSH) TCP首部中的急迫標(biāo)志 RARP (Reverse Address Resolution Protocol) 逆地址解析協(xié)議 RFC (Request For Comments) Internet的文檔,其中的少部分成為標(biāo)準(zhǔn)文檔 RIP (Routing Information Protocol) 路由信息協(xié)議 RPC (Remote Procedure Call) 遠(yuǎn)程過程調(diào)用 RR (Resource Record) 資源記錄 RST (ReSeT) TCP首部中的復(fù)位標(biāo)志 RTO (Retransmission Time Out) 重傳超時 RTT (Round-Trip Time) 往返時間 SACK (Selective ACKnowledgment) 有選擇的確認(rèn) SLIP (Serial Line Internet Protocol) 串行線路I n t e r n e t協(xié)議 SMI (Structure of Management Information) 管理信息結(jié)構(gòu) SMTP (Simple Mail Transfer Protocol) 簡單郵件傳送協(xié)議 SNMP (Simple Network Management Protocol) 簡單網(wǎng)絡(luò)管理協(xié)議 SSAP (Source Service Access Point) 源服務(wù)訪問點 SSRR (Strict Source and Record Route) 嚴(yán)格的源站及記錄路由 SWS (Silly Window Syndrome) 糊涂窗口綜合癥 SYN (SYNchronous) TCP首部中的同步序號標(biāo)志 TCP (Transmission Control Protocol) 傳輸控制協(xié)議 TFTP (Trivial File Transfer Protocol) 簡單文件傳送協(xié)議 TLI (Transport Layer Interface) 運輸層接口 TTL (Ti m e - To-Live) 生存時間或壽命 TUBA (TCP and UDP with Bigger Addresses) 具有更長地址的T C P和U D P Telnet 遠(yuǎn)程終端協(xié)議 UA (User Agent) 用戶代理 UDP (User Datagram Protocol) 用戶數(shù)據(jù)報協(xié)議 URG (URGent) TCP首部中的緊急指針標(biāo)志 UTC (Coordinated Universal Time) 協(xié)調(diào)的統(tǒng)一時間 UUCP (Unix-to-Unix CoPy) Unix到U n i x的復(fù)制 WAN (Wide Area Network) 廣域網(wǎng) WWW (World Wide Web) 萬維網(wǎng) XDR (eXternal Data Representation) 外部數(shù)據(jù)表示 XID (transaction ID) 事務(wù)標(biāo)識符 XTI (X/Open Transport Layer Interface) X/ O p e n運輸層接口
上傳時間: 2013-11-13
上傳用戶:tdyoung
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