quora system design

1. Preface Embedded technology integrating computer technology, communication technology, micro-electronics technology and other technologies has entered a rapid development stage, embedded systems have been widely used in aviation, consumer electronics, information appliances, network communication and other fields. As an embedded processor, arms3c2440arm is a cost-effective chip and has broad application prospects in various fields. As the background of science and technology changes, the ship

Author: Week Smooth Note: Most of the ideas and code are copied from the Internet or open source code, in order to organize this article, the author also spent a lot of painstaking efforts, in order to show respect for my labor, please reprint the author and the source. First, a primer Recently unemployed at home, free to do nothing. By looking up information on the Internet and looking at open source code, this paper studies some design of Internet h

Currently, many companies are engaged in 3D geological modeling systems. Mature foreign products include GOCAD, EarthVision, GemCom, and Surpac. They have high performance requirements, high costs, and different geological applications, many companies, such as hypergraphs, are doing this in China, but they can only perform simple application analysis on massive data. From this we can see that it is really difficult to compile this system! Now that I a

Why write this article?? As I slowly dive into Android development, I'm increasingly finding that there's a lot of callback ideas in Android, at least in application development. For example, the life cycle of activity, the life cycle of fragment is the callback function implementation, the event processing mechanism in Android is a callback, the thread of the asynchronous task, loader, Hanlder, etc. are based on callback, and so on.?? One of the fundamental ideas of Android is the callback, whi

Label:Objective A period of time to participate in self-examination, to test the principles of the database, in which also more understanding of a lot of database problems. For example, how to create a good database, how to create a database. 图一 数据库创建框架 Now start the Machine room reconstruction, formerly used is Brother Siang design database, now found themselves can also

gb8567--88Database Design Manual1 IntroductionHigh-quality database in the process of processing big data in the program or system is very important, so there are many requirements and provisions for database design. First of all, the database should have a good maintainability, flexibility, and the database of the algorithm logic must also have a certain degree

Copyright notice: This article by Hanwei original article, reprint please indicate source:Article original link: https://www.qcloud.com/community/article/162Source: Tengyun https://www.qcloud.com/communityRPC is a convenient programming model of network communication, because of its high integration with programming language, it greatly reduces the complexity of processing network data, and makes the readability of code more noticeable. However, the composition of RPC itself is more complex, bec

Analyze the design of test cases from the "System login" test Case caseWriting test cases is the most basic work of a software Test engineer. But how to write a good test case, this really need me to do the usual work carefully summed up.Below I use "System login" black box test case design to analyze how to write test

(performance first: Template management): Most of the final output pages are website homepage, subchannel/topic page, and the news details page is generally a combination of various background subsystem modules, this combination of publishing logic is very rich, and the portal system is responsible for managing the combined performance of these background subsystems; Frontend release (Efficiency First: release management): cache release for end us

embedded devices, but how to improve the recognition rate and stability of fingerprint recognition system, There are a number of technical challenges in reducing costs and extending stability and node distribution.Therefore, this paper studies the core of microprocessor at91sam7x256 with ARM core, external extended fingerprint sensor MBF200 to form fingerprint identification server hardware, system softwar

Document directory Hardware Error Stream Data Access Large-scale Dataset Simple consistency Model "Mobile computing is more cost-effective than mobile data" Portability between heterogeneous software and hardware platforms Copy storage: the first step Copy Selection Security Mode Disk Data error, heartbeat detection and re-replication Cluster balancing Data Integrity Metadata disk error Snapshots Data Block Staging Assembly line Replication DFSShell DFSAdmin Browser Interfa

Introduction Prerequisites and Design Objectives Hardware error Streaming data access Large data sets A simple consistency model "Mobile computing is more cost effective than moving data" Portability between heterogeneous software and hardware platforms Namenode and Datanode File System namespace (namespace) Data replication Copy stor

Asp.net| Design Abstract "The website News management system developed by using ASP.net and ado.net technology has realized the dynamic management of the website news, which makes the management of information more timely and efficient, and improves the work efficiency." At the same time, the system development principle, the