fundamentals of microelectronics

2017-2018-1 20155222 "Fundamentals of Information Security system Design" 10th week IPC mechanism under Linux The communication mechanism between multiple processes under Linux is called IPC (inter-process Communication), which is a way of communicating with each other across multiple processes. There are several ways of interprocess communication under Linux: Half-duplex pipes, Named pipes, message queues, signals, semaphores, shared memory,

Computer Fundamentals and computer system compositionThe computer system consists of two major parts, hardware (Hardware) and system software (software).Second, von Neumann systemThird, the server storage typeDAS: Direct attached storage, storage directly connected to the server, similar to the server directly add a storage, with the IDE, SATA cable and other cables to connect.NAS: Network attached storage, through the local area network, the direct i

What is Iptables? Iptables is a powerful application-layer firewall tool under Linux, but after understanding its rules and fundamentals, it is easy to configure.What is NetFilter? When it comes to iptables, it is necessary to mention that Netfilter,iptables is an application layer, and its essence is a configuration tool for defining rules, while the core packet interception and forwarding is netfiler.NetFilter is a packet processing modu

Java Web Basics Tutorial (ii) Development fundamentals reprint: Future Wei LaiObjectiveThe Java Web is a technical implementation of a network application based on the b\s (browser \ Server) architecture. This structured Web application is used by a large number of enterprise-class applications. As the scale of Web applications grows, the traditional Web development model cannot meet the increasingly complex business needs, so there is a more reasonab

C + + Prerequisite fundamentals and programming specificationsC language is process-oriented programming, emphasizing the execution order of programs, top-down, and C + + is Object-oriented programming, the program as a number of objects, each object has its own attributes (variables) and behavior (function).2. Attributes are data that describe the characteristics of an object, and the behavior is what the object can do, such as every hero in the leag

Linux System Fundamentals (ii)First, the Linux system structure1.Linux system structure is inverted tree type2./bin # #二进制可执行文件也就是系统命令/sbin # #系统管理命令存放位置/ Boot # #启动分区, responsible for system startup/ Dev # #设备管理文件/ etc # #大多数系统管理文件 /Home # #普通用户的家目录/lib # #32位系统库文件存放位置/lib64 # #64位系统库文件存放位置/media # #系统临时设备挂载点/mnt # #系统临时设备挂载点/run # #系统临时设备挂载点/opt # #第三方软件安装位置/proc # #系统信息/root # #超级用户家目录/srv,/var # #系统数据/sys # #系统管理, mostly about the kernel/ tmp # #系

Today to the bookstore to see a book called "C # Internet of Things Programming fundamentals " books, interested in the internet of things I grabbed to see, the book is the project is the host computer development projects, simpler, if the Internet of things development is just this, it seems that I do IoT development is more than enough. I looked at this book for more than 10 minutes, and the technical mishap made me face it. This book says using WPF

Introduction: TitleImportJava.io.FileInputStream;ImportJava.io.FileOutputStream;/** * @authorCzchina **/ Public classTeststream { Public Static voidMain (string[] args) {FileInputStream FLs=NULL; FileOutputStream Fos=NULL; Try{FLS=NewFileInputStream ("E:/android/androidstudioprojects/text.txt"); FOS=NewFileOutputStream ("E:/android/androidstudioprojects/store.txt"); //generating a byte array byte[] buffer=New byte[500]; intnum = 0; intTMP = 0; intTMP1 = 0; for(inti=0;i) {tmp= Fls.rea

Introduction: Title ImportJava.io.FileInputStream;/** * @authorCzchina **/ Public classTeststream { Public Static voidMain (string[] args) {//TODO auto-generated Method Stub//declaring a reference to an input streamFileInputStream FLS =NULL; //declaring a reference to the output streamFileOutputStream fos =NULL; Try{ //first, generate an object representing the input streamFLS =NewFileInputStream ("E:/android/androidstudioprojects/text.txt"); //generating a byte array byte[

selector (Event- driven ) and the non-blocking feature of socket channel, it can effectively solve the situation that the high concurrency environment consumes a lot of thread resources for client request processing. (1) Traditional synchronous blocking IO (network socket programming socket): Each request for the client connection, need to allocate a separate thread for processing, because at any time to monitor whether it has data read and write, and in the data read and write operation, becau

Countdown shutdown command Tsshutdn ——-60-second Countdown shutdown command TOURSTART--XP profile (roaming XP programs that appear after installation is complete) taskmgr--– Task Manager EVENTVWR ——-Event Viewer Eudcedit ——-Character-font procedure Explorer ——-Open Resource Manager Packager ——-Object Wrapping Program perfmon.msc--Computer Performance Monitoring Program progman--– Program Manager regedit.exe--Registration Form Rsop.msc ——-Group Policy result set Regedt32

[One Moss per day]-Fundamentals of the Large Pool the following describes the 'large Pool 'introduced from Oracle 8 '. What is Large Pool ")? A large pool is an area in SGA similar to a shared pool, but its usage is strictly limited. Only a few types and sizes of memory can be allocated in this pool. The memory of the large pool is not from the shared pool, but directly from the SGA. Therefore, you need to increase the shared memory capacity when the

) { new Test02 (); T.test (); System.out.println (s);//Error }publicvoid Test () { System.out.println (s) ;}}unresolved compilation problem: static reference to the non-static field sIt is still reported that a static method cannot invoke a non-static variable.Although, the object of this class is initialized in a static method.The reason for the moment is unclear, Java, new an object and class static domain, is not in memory is not a place, have seen a video be

collections class cannot instantiate.Multithreading1, the difference between threads and processes4 states of a thread: run, ready, suspend, end.A process can have multiple threads, sharing the program's memory space between threads (code snippets, data, heap space, and some process-level resources, such as open files), but each thread has its own stack space.1) Use multithreading to reduce the response time of the program.2) threads are less expensive to create and switch than processes, makin

the upper layer into the packet segment to the lower layer. At the receiving end, the TCP protocol is responsible for reorganizing the received messages to the upper layer. The TCP protocol also handles end-to-end traffic control to avoid slow receivers not having enough buffers to receive large amounts of data sent by the sender. The UDP protocol is an unreliable, non-connected protocol .IP address: IP URL and IP host address. The IP URL represents the address of the network, and the IP host a

them in bulk and reclaim the memory at the right time (for example, by pressing the pause key or the level switch). Mono's memory recovery is done automatically in the background, and the system chooses the right time for garbage collection. At the right time, you can also manually call System.GC.Collect () to suggest that the system do a garbage collection.It is important to note that the call here is really just a suggestion, that the system may be recycled after a period of time, or it may b

; //newobj.i = this.i; //return NEWOBJ; //implementing Deep Replication-Mode 2: Serialization/deserializationBinaryFormatter BF =NewBinaryFormatter (); MemoryStream Ms=NewMemoryStream (); Bf. Serialize (MS, This); Ms. Position=0; returnBF. Deserialize (MS); } ...... } [Serializable] Public classA { Public stringMessage ="I am the original a"; }View Code PS: generally inheritable types should avoid implementing the ICloneable interface , because doing so would force a

1, b/s software system structure Network software system development including C/s and b/s two kinds of architecture, can carry out the same business processing. C/S is client/server abbreviation, both client and server structure, like commonly used QQ, and so on network software. b/S is brower/server abbreviation, both browser and server structure, only need to launch a browser. Our mobile applications are all part of the C/s structure. 2, the basic concept of network

system1) Resolve name conflict issues2) Easy class Managementfull-Limit naming of classes: Package name + class nameCp: Mount PathImport Imports date Gets the current time7.public source file can only have one Public common class name and file name consistent8.Javac Java source files compiled into a class file can compile multiple files at a time9.Java program starts from main method10.Java There can be more than one Java class in a source file . However, there can be only one Multiple sou

In a template-specific version of a call, the argument type must exactly match the formal parameter type of the special version function, and if it does not, the compiler instantiates an instance for the argument template definition. Lift a chestnut: Template Again, the argument type must be the formal parameter type of the special version function. Exact Match, even if there is no const in the front of the argument, and the template parameter does not constitute a special. The sp