In Java3D, if after compiling a branchgroup or after making it live, we need to add or remove object that is part of that branchgroup, this is an example on how to do it.

In this example, i have a point object in my scene. By clicking on the button on the first time, the program add another point and by clicking on the second time, the programe remove that point from scence.

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មនុស្ស​តូច​ៗ​ក្នុង​រូប​នេះ កំពុង​តែ​តម្រង់​ជួរ​ ដើម្បី​ត្រៀម​ថើប​គ្នា បំបែក​ឯតទគ្គកម្ម​ខាង​ថើប​គ្នា នៅ​ទីលាន Charles de Gaulle ក្រុង​រ៉ែនស៍។ មិន​ដឹង​ថា​បាន​សម្រេច​ឬ​អត់​ទេ ព្រោះ​មិន​សូវ​មាន​មនុស្ស​ចូល​រួម​ច្រើន​ឡើយ។

រូប​ថត​មួយ​នេះ ខ្ញុំ​បង្កើត​ឡើង​ដោយ​ផ្សំ​រូប​ជា​ច្រើន​ ដូច​បង្ហាញ​ក្នុង​រូប​ខាង​ក្រោម​បញ្ចូល​គ្នា។

តើ​ឆ្ងល់​ពី​របៀប​ផ្គុំ​ចូល​គ្នា​មែន​ទេ? នេះ​ជា​គន្លឹះ​ខ្លី​ៗ ដែល​អាចជួយ​អ្នក​ឱ្យ​បង្កើត​រូប​បែប​នេះ​បាន។
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You may probably have experience with your text writing does not appear in yahoo messenger chat. There are also many solutions proposed through the internet but among them, only one can solve this problem.

Please follow the instructions below:

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Antivirus Studio 2010 គឺ​ជា​កម្មវិធីកំចាត់មេរោគក្លែងក្លាយ ដែលបង្កើតឡើង​ក្នុង​គោល​បំណង​បំភ័យ​និង​បោក​បញ្ឆោត​អ្នក​ប្រើប្រាស់កុំព្យូទ័រ​អោយគិត​ថាកុំព្យូទ័រ​របស់​ខ្លួន​ឆ្លង​មេរោគ​ហើយ។

នៅពេល​ដែល​វា​ចាប់​ផ្តើម​ប្រតិបត្តិការ​ វា​បានបង្ហាញ​សារបំភ័យ​អ្នក​ថា កុំព្យូទ័រ​របស់​អ្នក​បាន​ផ្ញើរ​ស្ពាមអ៊ីមែល ហើយ​ដែលលេខ IP address របស់កុំព្យូទ័រអ្នក​ត្រូវ​បាន​ប៉ូលីស​កត់​ត្រាទុកនិង​ចាត់​វិធានការ​ចំពោះអ្នក។ ទាំង​នេះ​សុទ្ធ​តែជាការ​បោក​បញ្ឆោត។  Antivirus Studio 2010 គឺ​ជា​មេរោគកុំព្យូទ័រ​មួយ​ប្រភេទ​ដែល​វា​គ្រាន់តែ​បំភ័យ​អ្នក​ប្រើប្រាស់​អោយ​ទិញ​កម្ម​វិធី​កំចាត់​មេរោគ។ ​មេរោគនេះ​នឹង​បញ្ឈប់​ដំណើរកម្ម​វិធី​មួយ​ចំនួន និង​ ប្លុក​កម្មវិធីកំចាត់​មេរោគ​ពិត​ប្រាកដ​របស់​អ្នក។

រាល់​មេរោគ​ដែល Antivirus Studio 2010​ ចាប់​បាន​គឺ​សុទ្ធ​តែ​ការ​បំភាន់​ភ្នែក។ វា​ដំណើរ​ការដូចជា​​កម្ម​វិធី​កំចាត់​មេរោគ​បិតៗគឺ​វា​ចាប់​បាន​មេរោគ​នៅក្នុង​កុំព្យូទ័រ​របស់​យើង​រាប់​សិប ហើយ​វា​ទាម​ទារ​អោយ​យើង​លុប ប៉ុន្តែ​យើង​មិន​អាច​លុប​បាន​ទេ បើចង់​លុប​ត្រូវ​ចូល​ទៅ​ទិញ​ឡាយសិនក្នុង​គេហទំព័រ​របស់​វា។

Antivirus Studio 2010

អានបន្ត

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A digital signature is basically a way to ensure that an electronic document (e-mail, spreadsheet, text file, etc.) is authentic. Authentic means that you know who created the document and you know that it has not been altered in any way since that person created it.

Digital signatures rely on certain types of encryption to ensure authentication. Encryption is the process of taking all the data that one computer is sending to another and encoding it into a form that only the other computer will be able to decode. Authentication is the process of verifying that information is coming from a trusted source. These two processes work hand in hand for digital signatures.

There are several ways to authenticate a person or information on a computer:

• Password – The use of a user name and password provide the most common form of authentication. You enter your name and password when prompted by the computer. It checks the pair against a secure file to confirm. If either the name or password do not match, then you are not allowed further access.
• Checksum – Probably one of the oldest methods of ensuring that data is correct, checksums also provide a form of authentication since an invalid checksum suggests that the data has been compromised in some fashion. A checksum is determined in one of two ways. Let’s say the checksum of a packet is 1 byte long, which means it can have a maximum value of 255. If the sum of the other bytes in the packet is 255 or less, then the checksum contains that exact value. However, if the sum of the other bytes is more than 255, then the checksum is the remainder of the total value after it has been divided by 256. Look at this example:
  

  Byte 1	Byte 2	Byte 3	Byte 4	Byte 5	Byte 6	Byte 7	Byte 8	Total	Checksum
  212	232	54	135	244	15	179	80	1151	127

  1151 divided by 256 equals 4.496 (round to 4)
  Multiply 4 X 256 which equals 1024
  1151 minus 1024 equals 127

• CRC (Cyclic Redundancy Check) – CRCs are similar in concept to checksums but they use polynomial division to determine the value of the CRC, which is usually 16 or 32 bits in length. The good thing about CRC is that it is very accurate. If a single bit is incorrect, the CRC value will not match up. Both checksum and CRC are good for preventing random errors in transmission, but provide little protection from an intentional attack on your data. The encryption techniques below are much more secure.
• Private key encryption -Private key means that each computer has a secret key (code) that it can use to encrypt a packet of information before it is sent over the network to the other computer. Private key requires that you know which computers will talk to each other and install the key on each one. Private key encryption is essentially the same as a secret code that the two computers must each know in order to decode the information. The code would provide the key to decoding the message. Think of it like this. You create a coded message to send to a friend where each letter is substituted by the letter that is second from it. So “A” becomes “C” and “B” becomes “D”. You have already told a trusted friend that the code is “Shift by 2″. Your friend gets the message and decodes it. Anyone else who sees the message will only see nonsense.
• Public key encryption – Public key encryption uses a combination of a private key and a public key. The private key is known only to your computer while the public key is given by your computer to any computer that wants to communicate securely with it. To decode an encrypted message, a computer must use the public key provided by the originating computer and it’s own private key.The key is based on a hash value. This is a value that is computed from a base input number using a hashing algorithm. The important thing about a hash value is that it is nearly impossible to derive the original input number without knowing the data used to create the hash value. Here’s a simple example:
  

  Input number	Hashing algorithm	Hash value
  10667	Input # x 143	1525381

  You can see how hard it would be to determine that the value of 1525381 came from the multiplication of 10667 and 143. But if you knew that the multiplier was 143, then it would be very easy to calculate the value of 10667. Public key encryption is much more complex than this example but that is the basic idea. Public keys generally use complex algorithms and very large hash values for encrypting: 40-bit or even 128-bit numbers. A 128-bit number has a possible 2¹²⁸ different combinations. That’s as many combinations as there are water molecules in 2.7 million olympic size swimming pools. Even the tiniest water droplet you can image has billions and billions of water molecules in it!

• Digital certificates – To implement public key encryption on a large scale, such as a secure Web server might need, requires a different approach. This is where digital certificates come in. A digital certificate is essentially a bit of information that says the Web server is trusted by an independent source known as a Certificate Authority. The Certificate Authority acts as the middleman that both computers trust. It confirms that each computer is in fact who they say they are and then provides the public keys of each computer to the other.

Source: http://computer.howstuffworks.com/digital-signature.htm