Black and white Computer

Parity check is use to check error of the data send. When data is send from source to receiver , data may lose or having error. The receiver will receive error data. There are 2 types of error: Single bit error- Only one bit is changed from 1 to 0 or from 0 to 1. Burst error- 2 or more bits in the data unit have changed. For the receiver to ensure the data send is correct , error detection is use. Error detection uses the concepts of redundancy, which means adding extra bits detecting error of the destination. Parity check is the simplest technique in error detection techniques. A redundant bit is appended (added at the end of the data) to every data unit.The parity also have 2 type which are odd parity and even parity. Even Parity is the total number of 1's in data plus parity bit must be an even number while the Old parity is odd number. Example of even parity: Data #1's in data Parity bit(P) # 1's (data + P) 0110110 4(even) 0 4(even) 0011111 5(od...

Sorting is one of the most common applications in computer science. The process through which data are arranged in either ascending or descending order according to their values. Sorts are generally classified as either internal or external: Internal sort -All of data are held in primary storage during the sorting process. External sort- Uses primary storage for the data currently being sorted and secondary data for any data that will not fit in primary memory. In choosing Sorting techniques there are few  factors you should consider which are: Number of item and load Number of characters in item or record Average case  Best case Worst case Sorter stabilization especially for sorter that use 2 keys Sorting Method There are many sorting techniques, and every technique can be categorized according to their method group.Here is the method: Priority Queue Sorting Method An array A is divided into sub-array P represents priority queue and sub-array...

What is deadlock? Deadlock is a permanent blocking of a set of processes that either compete for system resources or communicate with each other. A set of processes is blocked awaiting an event that can only be triggered by another blocked process in the set. The Deadlock is permanent and don have any efficient solution. Example of deadlock There are 2 process P and Q compete for resources A and B. Each resource only can use by 1 process.The process P get and hold the resource B and wait the resource A available , at the same time the process Q get and hold the resource A while waiting resource B available. And this condition it cause deadlock because both process need use resource A and B at the same time, the process P not willing to let go the resource B same as the process Q. Some time we also use the Joint Progress Diagram to illustrate the two process competing the resource. In the joint progress diagram we have 6 path of process Q ...

Domain name is very important no only in Search Engine Optimization (SEO) but also important for the website itself! Let me give you an example  http://www.google.com , I sure almost everyone know what is google. Google is a search engine, Google also synonymous with the word "search". Now you imagine that google was the search engine that just launched for few day, do you think that internet user will type google.com into their address bar or search it using yahoo! or MSN ? Another example like YouTube. Think that you are newbie on using internet, you want to watch a video, would you type the word "YouTube" inside your query or you type in "video website"? If you google "video website" you will surprise that YouTube is not on the first page. Last example I want to give is Capitol Hotel. Capitol Hotel is a hotel in Kuala Lumpur, Malaysia. If Capitol Hotel is new hotel that open for few week and it want to have a website to provide informa...

Most of the SEOs perform searches dozens or hundreds of time per day, and when you do, it's important that you to turn off the personalized search results appear. What I mean by personalized result is the search result that is influenced by your own search history which will apposed to what typical searcher would see. Firefox is a good browser for SEOs for many reason, but one of its most helpful features is the ability to search right from the address field of the browser,the area at the top of the browser where you will see the URL of the web page. By having little customization, you can perform Google searches that are DE-personalized. From the bookmarks |Organize Bookmarks .... menu, select any bookmarks folder in the left pane. (Do not simply select the all Bookmarks folder,because it won't work.) Right-click the folder and select New Bookmark.... Add the following values to the text fields: Name : Google de-personalized s...

When try to connect to the local database , you found this message : Status : Failure -Test failed: Listener refused the connection with the following error: ORA-12505, TNS:listener does not currently know of SID given in connect descriptor I consider this as error ORA-1250. In my case ,to solve this problem you need to change the SID " xe " to " e161306 " then the problem solved! Then the question come when you try, you may be fail because the SID for mine may differ from yours! If you have dint change the Connection name , then you will see that there will be some word behind the dash '-', you should key in the word behind into the SID. Like mine is 'e161306'. How to know your SID? I think it was quite easy! All you need is open your msconfig if you are using Microsoft windows Operating System. Start --> run-->type in "msconfig"/ Start --> type in msconfig--> click msconfig.exe After you open the msconfig, yo...

I recently trying to add the derby plugin into the eclipse. When I try to add derby nature (PS: right-click on the java project -> "Apache Derby" -> "Add Apache Derby nature"  ),I get the pop up says : Error adding Derby jars to the project: org.eclipse.ui.internal.WorkbenchWindow cannot be cast to org.eclipse.jface.window.ApplicationWindow error pop up Does this picture look familiar? Error adding Derby jars to the project What I was Using is when facing this problem : jdk1.7.0_03 Eclipse IDE for Java EE Developers (Win32) version Juno (build from 2012/06/14)  derby-core-plugin 10.8.2 and -ui-plugin 1.1.3 (as there is no eclipse plugin for the latest version 10.9.1.0)  I also google about this problem before but i can't find any solution. After I try many time ,I finally found a way to solve it! A bad method,but take a look! Solution: The solution is d ownload another version of Eclipse IDE for Java EE Developers like Europa! Y...