google experiments

flashes at intervals of 1 s (the system resets every 1 s ). Iii. Conclusion This section describes the principle and usage of the watchdog timing circuit. In practical application, if high reliability is required, the watchdog can be applied to the system. When the system is shut down for some reason (the dog cannot be fed), the dog that is not fed will bark: "Master, there is an exception, there is an exception !" For a wireless sensor network, the power consumption during operation is a cruci

Some simple experiments on mountingFirst, add a hard disk folder u02 to the VM, add the file 1 [root @ enmoedu Desktop] # mkdir/u02 [root @ enmoedu Desktop] # touch 1 and enter fdisk-l to check whether the related commands are added to [root @ enmoedu desktop] # fdisk-lDisk/dev/sdb: 21.5 GB, 21474836480 bytes255 heads, 63 sectors/track, 2610 cylindersUnits = cylinders of 16065*512 = 8225280 bytesSector size (logical/physical ): 512 bytes/512 bytesI/O

() { - Try { -Thread.Sleep (10); +}Catch(interruptedexception e) { - e.printstacktrace (); + } Ashouldstop=true; at } - }; - Thread thrd1; - Thread Thrd2; - - inti; in int[] acnt=New int[2] [2]; - int[] rcnt=New int[2] [2]; to for(i=0;i){ +Thrd1 =NewThread (RUN1); -Thrd2 =NewThread (run2); the * Thrd1.start (); $ Thrd2.start ();Panax Notoginseng - Thrd2.join (); the System.out.println (i)

create a new project document or open an existing project document, you can click Cancel to go directly to the main interface!650) this.width=650; "height=" 607 "alt=" wkiom1vddeyhm9ixaajeyykwvas952.jpg "src=" Http://s3.51cto.com/wyfs02/M01/6C /47/wkiom1vddeyhm9ixaajeyykwvas952.jpg "border=" 0 "/>After creating the project, we enter GNS3 's main software interface:650) this.width=650; "height=" 607 "alt=" wkiol1vddbirgdoqaag6netatcy475.jpg "src=" Http://s3.51cto.com/wyfs02/M02/6C /43/wkiol1vddb

the parent class's variable can be used directly in the subclass as long as it is in the Func body. However, instantiation within subclasses is not surefire plan, so let's look at/*---------------------------------------------------------------------------*/varParent =function(name,age) { This. Name =name; This. Age =Age ;} Parent.prototype={run:function() {alert ( This. Name + "is running!"); }, Work:function() {alert ( This. Name + "is working!"); },}varChild =function(name,age) { This. Name

ZigBee Tour (v): Several important CC2430 basic experiments--serial communication first, the connecting link In the wireless sensor network, the CC2430 needs to send the collected data to the host computer (ie pc), while the host computer needs to transmit the control information to the CC2430. All this is inseparable from the transmission of information between the two. In this section, we will learn how to realize the serial communication between

the subquery, if the subquery is empty, then nothing will be inserted.4, the climax is coming--after removing the where in the subquery, that is, the select condition is definitely a value, it actually inserts all the records in Table E. Ah, fortunately the test library, the amount of data is small, but also executed 5s. Well, that's unusual. Delete all! Depending on the result set insert or need to be cautious ah, otherwise how much garbage data in practice.5, return to the original intention.

HSRP is the private protocol of Cisco, the high-priority primary router as the virtual router with the virtual gateway IP address, the ARP request to the corresponding PC, and the MAC address of 000.0c07.acxx,xx is the HSRP group ID. Duplicate group IDs should be avoided in the production network, causing the Mac to repeat itself. STANDBY preempt allows high-priority router preemption. STANDBY track allows the router to specify the monitored ports and routes for the HSRP process, changing the HS

1.Windows installation of MongoDBHttp://www.mongodb.org/downloads download MSI, next step ...After installation, to the installation directory of the bin directory execution Mongod start the database service, if not up, error "E:\data\db not found", create a corresponding folder, which is the folder to store the database.Then start the MONGO database Shell client2.mongo is a JavaScript interpreter that can run various JS commands directly, such as "x = 200,X/5";You can also use the JS standard l

Using GNS3 and Cisco IOU to build routing exchange experiments-concept paperWhen it comes to simulators, everyone is familiar with Hyper-V, VMware, and VirtualBox operating system simulators (virtual machines), as well as emulators such as QEMU, which are commonly used in UNIX and Linux, which are object-oriented simulators. There are also arcade game simulators for arcade-oriented objects. Network simulator for network device or network operating sys

hosts participating in the PKI system synchronize time to begin the deployment of the PKI.Step Two: Deploy the Certificate ServerStep three: The client generates a key pair (public key, private key)Fourth step: Verifying the Certificate Servereach entity needs to obtain the root certificate of the Certificate Server, which contains the public key of the Certificate server. After you obtain the root certificate, you can verify the Certificate Server offline by fingerprintFifth step: Apply for a

I recently wrote a lot of Java-related blogs, because I am performing performance tuning on a java system I have previously made. In this process, I have accumulated some experience and learned a lot. This article also applies. In my system, there is a query that performs a search on an index in the memory, and then fills all the data items found in a jsonobject, finally, call the tostring function of this jsonobject to convert it into a string and send it over the network.The experiment shows

to get every character received. When this character is not '@', it indicates that the input is not complete. Add the character to the character array recv_buf. When this character is exactly, this indicates that the input is complete. Therefore, every character in recv_buf is sent to the PC in order and recv_count is reset.(5) Experiment Results First, complete the hardware connection and open the serial port debugging tool. The configuration parameters are as follows: Click "open serial port

Experiments on free and bad data blocks:Use dbv to check data files[Oracle @ orahost ~] $ Dbv file =/oracle/oradata/orcl/users01.dbfDBVERIFY: Release 10.2.0.5.0-Production on Tue May 6 06:48:02 2008Copyright (c) 1982,200 7, Oracle. All rights reserved.DBVERIFY-Verification starting: FILE =/oracle/oradata/orcl/users01.dbfPage 310 is marked uptCorrupt block relative dba: 0x01000136 (file 4, block 310)Bad check value found during dbv:Data in bad block:Ty

In the newly released Windows Server 2008 R2, for virtualization, we are deeply impressed by the real-time migration of Hyper-V R2, support for a maximum of 384 virtual machines, hot addition/removal of virtual storage, and many other new features. In this series of hands-on experiments, we will conduct Step by Step learning on Hyper-V R2 installation, configuration of Hyper-V R2 settings and virtual networks, virtual hard disks and virtual machines,

The OSPF (Open Shortest Path First) routing protocol, which uses Zebra for OSPF experiments, is a link-state technology and is the most widely used and optimal performance protocol in IGP, it solves the large and scalable network requirements that RIP cannot solve, and is suitable for large-scale networks. Zebra supports OSPFv2 and OSPFv3 (OSPF for IPv6, CISCO has not encapsulated it). Due to restrictions, the following OSPF verification is also perfo

. After determining the loading interface will appear, this time needs to be closed.Then click Debug again this time is the normal loading state. Appears to indicate a normal load.6, then we click the Run button. After the normal state he will stop in the main function, which is the system automatically. We'll run the drawing experiment after we continue with the Run buttonThe result of the drawing is this, and the sine function appears. As follows:The Vivi console displays as follows:After that

user_00的登录530 Permission denied. Login failed. Add1. Post all valid options for the configuration file in the experiment# Cat Vsftpd.conf | Grep-v "^#" | Grep-v "^$" anonymous_enable=yes local_enable=yes write_enable=yes local_umask=022 anon_ Upload_enable=yes anon_max_rate=2000000 dirmessage_enable=yes xferlog_enable=yes connect_from _port_20=yes xferlog_std_format=yes listen=yes guest_enable=yes guest_username=virtftp pam_service_name=vsftpd user_config_dir=/etc/vsftpd/vir

First, theoretical knowledge1. The task of lexical analysis phase is to scan and decompose the string composing the source program from left to right, and identify a word symbol with independent meaning according to the lexical rules of the language.2, the word law is the formation of the word symbol rules. It is divided into basic words, identifiers, constants, operators, and bound characters.Second, the experimental experience1, before always put other functions together into the main function

The first time I saw the lexical analysis that there is no clue, read a book, there is a original topic can learn from, consider the details of the problem, lexical analysis needs to be divided into key words, letters, numbers, symbols and so on.The lexical analysis of the book at the beginning also do not understand, analysis function, ask the next classmate, slowly understand.So I did 3 functions.(1) To determine whether the first character is a letter or a number, is a letter to see if it can