This project attempts to implement a Database using B+Tree. The project has developed a DATABASE SYSTEM with lesser memory consumption. Its API includes simple SQL Statements and the output is displayed on the screen. Certain applications for which several features of existing databases like concurrency control, transaction management, security features are not enabled. B+Trees can be used as an index for factor access to the data. Help facility is provided to know the syntax of SQL Statements.
標簽: project implement developed Database
上傳時間: 2013-12-25
上傳用戶:semi1981
About: hamsterdb is a database engine written in ANSI C. It supports a B+Tree index structure, uses memory mapped I/O (if available), supports cursors, and can create in-memory databases. Release focus: Major feature enhancements Changes: This release comes with many changes and new features. It can manage multiple databases in one file. A new flag (HAM_LOCK_EXCLUSIVE) places an exclusive lock on the file. hamsterdb was ported to Windows CE, and the Solution file for Visual Studio 2005 now supports builds for x64. Several minor bugs were fixed, performance was improved, and small API changes occurred. Pre-built libraries for Windows (32-bit and 64-bit) are available for download. Author: cruppstahl
標簽: C. hamsterdb structure database
上傳時間: 2013-12-11
上傳用戶:LouieWu
隨著光伏發(fā)電系統(tǒng)快速發(fā)展,以及電動汽車充電樁的普及,傳統(tǒng)的剩余電流保護器無法滿足實際需求。介紹了一款B型剩余電流保護器,采用磁調(diào)制剩余電流互感器和零序電流互感器采集剩余電流。根據(jù)GB/T 22794—2017標準要求,可識別1 kHz及以下的正弦交流、帶和不帶直流分量的脈動直流、平滑直流等剩余電流信號。經(jīng)信號調(diào)理電路將電壓信號送到單片機進行采集和判斷。通過試驗測試,該樣機在測試精度和速度上均符合國家標準的相關(guān)要求。The rapid development of photovoltaic power generation systems and the popularity of electric vehicle charging piles make the traditional residual current protective devices unable to meet the actual demand.This paper proposed a type B residual current protective device,which uses the magnetically modulated residual current transformer and the zero sequence current transformer to acquire the residual current.According to the requirements of GB/T 22794—2017,the type B residual current protective device can detect sinusoidal AC residual current of 1kHz and below 1kHz,pulsating DC residual current with and without DC component,smooth DC residual current and so on.The signal processing circuit sends the voltage signal to the MCU for acquisition and judgment.Through experimental tests,the device meets the relevant requirements of national standards in terms of test accuracy and speed.
標簽: 電流保護器
上傳時間: 2022-03-27
上傳用戶:
21世紀大學(xué)新型參考教材系列 集成電路B 荒井
上傳時間: 2013-04-15
上傳用戶:eeworm
家電維修(最基礎(chǔ)的教程B)1-20.Torrent
上傳時間: 2013-06-10
上傳用戶:eeworm
jk-b交通信號控制機原理圖
上傳時間: 2013-07-13
上傳用戶:eeworm
專輯類-實用電子技術(shù)專輯-385冊-3.609G jk-b交通信號控制機原理圖-1.3M.zip
上傳時間: 2013-08-02
上傳用戶:zhf1234
專輯類-電子基礎(chǔ)類專輯-153冊-2.20G 21世紀大學(xué)新型參考教材系列-集成電路B-荒井-159頁-2.8M.pdf
上傳時間: 2013-05-16
上傳用戶:pkkkkp
三次B樣條曲線源代碼,C語言編寫的三次B樣條曲線源代碼,希望大家喜歡。
標簽:
上傳時間: 2013-07-13
上傳用戶:chengli008
超聲理論與技術(shù)的快速發(fā)展,使超聲設(shè)備不斷更新,超聲檢查已成為預(yù)測和評價疾病及其治療結(jié)果不可缺少的重要方法。超聲診斷技術(shù)不僅具有安全、方便、無損、廉價等優(yōu)點,其優(yōu)越性還在于它選用診斷參數(shù)的多樣性及其在工程上實現(xiàn)的靈活性。 全數(shù)字B超診斷儀基于嵌入式ARM9+FPGA硬件平臺、LINUX嵌入式操作系統(tǒng),是一種新型的、操作方便的、技術(shù)含量高的機型。它具有現(xiàn)有黑白B超的基本功能,能夠?qū)Τ暬夭〝?shù)據(jù)進行靈活的處理,從而使操作更加方便,圖象質(zhì)量進一步提高,并為遠程醫(yī)療、圖像存儲、拷貝等打下基礎(chǔ),是一種很有發(fā)展前景、未來市場的主打產(chǎn)品。全數(shù)字B型超聲診斷儀的基本技術(shù)特點是用數(shù)字硬件電路來實現(xiàn)數(shù)據(jù)量極其龐大的超聲信息的實時處理,它的實現(xiàn)主要倚重于FPGA技術(shù)。現(xiàn)在FPGA已經(jīng)成為多種數(shù)字信號處理(DSP)應(yīng)用的強有力解決方案。硬件和軟件設(shè)計者可以利用可編程邏輯開發(fā)各種DSP應(yīng)用解決方案。可編程解決方案可以更好地適應(yīng)快速變化的標準、協(xié)議和性能需求。 本論文首先闡述了醫(yī)療儀器發(fā)展現(xiàn)狀和嵌入式計算機體系結(jié)構(gòu)及發(fā)展狀況,提出了課題研究內(nèi)容和目標。然后從B超診斷原理及全數(shù)字B超診斷儀設(shè)計入手深入分析了B型超聲診斷儀的系統(tǒng)的硬件體系機構(gòu)。對系統(tǒng)的總體框架和ARM模塊設(shè)計做了描述后,接著分析了超聲信號進行數(shù)字化處理的各個子模塊、可編程邏輯器件的結(jié)構(gòu)特點、編程原理、設(shè)計流程以及ARM處理模塊和FPGA模塊的主要通訊接口。接著,本論文介紹了基于ARM9硬件平臺的LINUX嵌入式操作系統(tǒng)的移植和設(shè)備驅(qū)動的開發(fā),詳細描述了B型超聲診斷儀的軟件環(huán)境的架構(gòu)及其設(shè)備驅(qū)動的詳細設(shè)計。最后對整個系統(tǒng)的功能和特點進行了總結(jié)和展望。
標簽: ARM 全數(shù)字 儀的設(shè)計 超聲診斷
上傳時間: 2013-05-28
上傳用戶:sssnaxie
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