Quality of Service ( QoS ) has ALWAYS been in a world of its own, but as the technology has been refi ned and has evolved in recent years, QOS usage has increased to the point where it is now considered a necessary part of network design and operation. As with most technologies, large - scale deployments have led to the technology becoming more mature, and QOS is no exception.
標簽： QOS-Enabled Networks
上傳時間： 2020-05-31
上傳用戶：shancjb
The fi rst edition of this book came about because Regina Lundgren had ALWAYS been fascinated with communication. She started writing novels in the third grade. When she was asked on her fi rst day at the University of Washington what she hoped to do with her degree in scientifi c and technical communication, she replied, “I want to write environ- mental impact statements.” When Patricia Clark hired her to work at the Pacifi c Northwest National Laboratory to do just that, she was overjoyed.
標簽： COMMUNICATION RISK
上傳時間： 2020-06-01
上傳用戶：shancjb
The first question most readers of an O’Reilly book might ask is about the choice of the cover animal. In this case, “why a duck?” Well, for the record, our first choice was a unicorn decked out in glitter and a rainbow sash. That response ALWAYS gets a laugh (we are sure you just giggled a little), but it also brings to the surface a common perception of software-defined networks among many expe‐ rienced network professionals. Although we think there is some truth to this perception, there is certainly more meat than myth to this unicorn.
標簽： Networks Software Defined SDN
上傳時間： 2020-06-01
上傳用戶：shancjb
摘 要 在網絡越來越發達的今天，人們對網絡的依賴越來越多，越來越離不開網絡，由此而產生的聊天工具越來越多，例如，國外的ICQ、國內騰訊公司開發的OICQ。隨著網絡聊天一類的聊天系統的發展日新月異，因此產生了制作一個類似QQ的網絡聊天工具。Java是一種程序設計語言，它具有簡單的、完全面向對象以及與平臺無關的結構，也具有可移植性、高性能和安全性，并提供了多線程的功能，而Java語言最大的成功之處在于它的平臺無關性和具有強大的網絡編程功能，基于Java網絡編程的強大功能，本人將用Java編寫一個網絡聊天系統。論文首先論述了系統的開發背景，并對所用到的開發工具與關鍵技術做了簡單的介紹。接著對系統的研究意義，研究現狀及設計目標進行分析，通過對系統需求和可行性進行分析，確定了系統的功能模塊，并畫出相應的功能結構圖、模塊圖和數據流圖。其次按系統總體設計的結果，對系統中的數據庫進行結構設計。一般來說，聊天工具大多數由客戶端程序和服務器程序,外加服務器端用于存放客戶數據的數據庫組成，本系統采用客戶機/服務器架構模式，通過Java提供的Socket類來連接客戶機和服務器并使客戶機和服務器之間相互通信，由于聊天是多點對多點的，而Java提供的多線程功能，用多線程可完成多點對多點的聊天。數據庫管理系統用SQL Server2000，完成并通過JDBC-ODBC橋訪問數據庫。聊天系統完成后將可進行多人對多人的聊天，對好友進行添加、刪除，對新用戶的注冊，發送消息、接受消息，傳輸文件等功能。界面設計細分化，方便使用者操作和理解。服務器實現了查詢和修改等功能，程序邏輯聯系較緊密。 關鍵詞：JAVA，C/S，SQL Server 2000, 多線程, 數據庫管理系統
上傳時間： 2021-10-25
上傳用戶：XuVshu
基于JAVA CS遠程監控系統軟件的實現(源代碼+WORD論文文檔論文)基于JAVA C/S遠程監控系統軟件的實現摘 要近年來，網絡技術的不斷發展，為遠程監控技術的發展創造了條件。遠程監控系統軟件越來越受到人們的重視，其實用性也毋庸質疑。基于JAVA C/S遠程監控系統軟件突破了空間的限制，使用者不用親臨，在自己的電腦面前就能輕松的實現對被監控端機器的監控。本系統采用Java網絡編程和Java圖形編程實現。筆者在開發過程中將網絡技術與遠程監控理論基礎相結合，實現了以下功能：能連續獲得被監控端機器屏幕變化；實現被監控端硬盤文件的上傳、下載；實現對鼠標、鍵盤的模擬；實現在遠程機器上執行任意DOS命令；遠程關機、遠程重啟計算機，方便了用戶監視和操作被監控端機器。本系統從系統需求分析、概要設計、詳細設計到具體的編碼實現和后期的代碼優化、功能測試都嚴格遵循了軟件工程的思想。 關鍵詞：遠程監控；Java Robot；屏幕截取；Java Socket
上傳時間： 2021-10-25
上傳用戶：
It all started rather innocuously. I walked into Dr GT Murthy’s office one fine day, andchanged my life. “Doc” was then the General Manager, Central R&D, of a very largeelectrical company headquartered in Bombay. In his new state-of-the-art electronics center,he had hand-picked some of India’s best engineers (over a hundred already) ever assembledunder one roof. Luckily, he too was originally a Physicist, and that certainly helped me gainsome empathy. Nowadays he is in retirement, but I will ALWAYS remember him as athoroughly fair, honest and facts-oriented person, who led by example. There were severalthings I absorbed from him that are very much part of my basic engineering persona today.You can certainly look upon this book as an extension of what Doc started many years agoin India … because that’s what it really is! I certainly wouldn’t be here today if I hadn’t metDoc. And in fact, several of the brash, high-flying managers I’ve met in recent years,desperately need some sort of crash course in technology and human values from Doc!
標簽： 開關電源
上傳時間： 2021-11-23
上傳用戶：
本設計基于STC89C52單片機、1302時鐘芯片準確計時、LCD1602液晶顯示、24c02芯片可以掉電存儲數據、3v直流電機模擬發動機工作。當無乘客時液晶可以顯示時間（年月日時分秒），時間可以按鍵設置，此時電機不工作；當有乘客時電機工作，可以通過按鍵開始計費系統工作，有清零鍵，收費可以修改（包括起價費、超過起價費每公里或分鐘收費、白天和夜晚收費標準），可以切換白天和夜晚收費標準，可以按照分鐘或公里收費切換。資料內容
上傳時間： 2021-12-01
上傳用戶：
目錄前言4簡介6 1 范圍72 規范性引用文件73 術語和定義74 試驗要求104.1 所需特性104.1.1 基本運動104.1.2 虛假運動104.1.3 信號容差114.1.4 振幅公差114.1.5 頻率公差114.1.6 掃描124.2 控制策略124.2.1 單點/多點控制124.2.2 多參考控制134.3 安裝135 嚴重程度135.1 頻率范圍145.1.1 低頻f Hz 1415.1.2 高頻f Hz 142
上傳時間： 2021-12-11
上傳用戶：XuVshu
FPGA片內FIFO讀寫測試Verilog邏輯源碼Quartus工程文件+文檔說明，使用 FPGA 內部的 FIFO 以及程序對該 FIFO 的數據讀寫操作。FPGA型號Cyclone4E系列中的EP4CE6F17C8，Quartus版本17.1。timescale 1ns / 1ps//////////////////////////////////////////////////////////////////////////////////module fifo_test( input clk, //50MHz時鐘 input rst_n //復位信號，低電平有效 );//-----------------------------------------------------------localparam W_IDLE = 1;localparam W_FIFO = 2; localparam R_IDLE = 1;localparam R_FIFO = 2; reg[2:0] write_state;reg[2:0] next_write_state;reg[2:0] read_state;reg[2:0] next_read_state;reg[15:0] w_data; //FIFO寫數據wire wr_en; //FIFO寫使能wire rd_en; //FIFO讀使能wire[15:0] r_data; //FIFO讀數據wire full; //FIFO滿信號 wire empty; //FIFO空信號 wire[8:0] rd_data_count; wire[8:0] wr_data_count; ///產生FIFO寫入的數據ALWAYS@(posedge clk or negedge rst_n)begin if(rst_n == 1'b0) write_state <= W_IDLE; else write_state <= next_write_state;endALWAYS@(*)begin case(write_state) W_IDLE: if(empty == 1'b1) //FIFO空， 開始寫FIFO next_write_state <= W_FIFO; else next_write_state <= W_IDLE; W_FIFO: if(full == 1'b1) //FIFO滿 next_write_state <= W_IDLE; else next_write_state <= W_FIFO; default: next_write_state <= W_IDLE; endcaseendassign wr_en = (next_write_state == W_FIFO) ? 1'b1 : 1'b0; ALWAYS@(posedge clk or negedge rst_n)begin if(rst_n == 1'b0) w_data <= 16'd0; else if (wr_en == 1'b1) w_data <= w_data + 1'b1; else w_data <= 16'd0; end///產生FIFO讀的數據ALWAYS@(posedge clk or negedge rst_n)begin if(rst_n == 1'b0) read_state <= R_IDLE; else read_state <= next_read_state;endALWAYS@(*)begin case(read_state) R_IDLE: if(full == 1'b1) //FIFO滿, 開始讀FIFO next_read_state <= R_FIFO; else next_read_state <= R_IDLE; R_FIFO: if(empty == 1'b1)
上傳時間： 2021-12-19
上傳用戶：20125101110
實驗教學一直是工科教學中不可或缺的組成部分,對培養學生的動手能力,獨立思考能力,創新思維與發散思維具有重要的作用。針對目前電路教學實驗中電路仿真實驗與實物電路實驗各自獨立,無法統一問題,提出將仿真電路實驗與實物電路實驗有機的結合同步操作,并使用Web發布實現遠程實驗操作。采用Multisim作為電路實驗仿真平臺,NI Eiviss II作為實物電路實驗硬件平臺,運用LabVIEW整合Multisim電路仿真實驗與實物電路實驗,實現仿真與實物實驗有機結合,兩種實驗可同步進行。學生在仿真實驗中先可探索實驗,然后做實物實驗。同時運用LabVIEW開發出實驗過程人機交互操作接口界面,使用過程中效果良好。Experimental teaching has ALWAYS been an indispensable part of engineering education.And it ALWAYS plays an important role in cultivating students'practical ability,independent thinking ability,innovative thinking and divergent thinking.But simulation experiment and physical experiment cannot be unified in the circuit teaching experiment at present.In order to solve this problem,this paper proposes to combine organically the simulation circuit experiment with physical circuit experiment,and synchronously operate them.This paper uses the WEB publishing to achieve remote experimental operation.Multisim is used as the circuit simulation platform,and NI Eiviss II is used as the physical circuit hardware platform.Multisim circuit simulation experiment and physical circuit experiment are implemented by LabVIEW to realize the combination of simulation experiment and physical experiment.Students do explore experiments in simulation experiment firstly,and then do physical experiment.And this paper uses LabVIEW to develop the experimental man-machine interface.
上傳時間： 2022-04-05
上傳用戶：
