Let Your Drawing Respond Faster in ZWCAD
Processing speed of CAD software is one of the most concerned issues of every user. Fast speed can be achieved directly by either software or hardware upgrade. In case of ordinary PC configuration, how can we further raise the speed even without software update? Here are some tips: 1. If you frequently specify the color or linetype for certain entities instead of using Bylayer or Byblock features, data will increase dramatically in the drawing, and it will take more time to process these data. It is suggested to create adequate and appropriate layers to which entities of different meanings or properties can be assigned respectively, so that the option of Bylayer and Byblock can help to reduce the amount of data stored. 2. If there are lots of layers in a drawing, some of which contain complicated entities seldom used, then you can freeze these layers, so that they would not regenerate with other layers, and result in processing time saving. 3. Hatch (Fill) is a kind of entity occupying much RAM. Too much hatches would significantly drag down the processing speed. To maintain high speed: (1) Do the hatching at the last step, so that there are no hatches affecting the speed during previous drafting steps. (2) Assign all hatches to a single or some specific layers and freeze some or all of them if possible. Then they will not regenerate with other entities. (3) In the Config dialogue box, select the Display tab and check the option Not display hatch while zooming. Entities such as Solid, Donut and Trace have another kind of fill. They can be displayed faster by setting OFF for FILLMODE. 4. Text also has influence on the speed of ZOOM, REDRAW and REGEN. Simplifying the display mode of text could help to increase the speed to a large extent. (1) Use a simple text font during the preliminary drafting work, and then replace this font with desired ones at the final stage when there are no more modifications to other graphic entities. (2) Use QTEXT to enable quick display of text. After the command is activated, boundary frames of text areas are displayed instead of text themselves. 5. In the case that we have to insert raster images: (1) Go to the Config dialogue box, select the Display tab and check the option Pan and zoom with raster & OLE, if it is not necessary to view raster images while doing PAN and ZOOM. (2) Use the command IMAGEQUALITY to choose a low quality display mode, when we don’t need to view images with high quality. 6. When REGENMODE is set as ON, ZWCAD will regenerate graphics automatically after executing some commands. Turning the mode off can help to save the time spent on automatic regeneration of graphics. 7. Entities often turn into dash line type for the purpose of highlighting when they are selected for modification. Sometimes such highlights take lots of time to display. So you can think of closing HIGHLIGHT if necessary. Not all methods might suit each specific case, but they do help if applied properly. When you get familiar with these features, drafting work could never be a difficulty in terms of speed, and you may find it easy and convenient to use ZWCAD in any situations. About ZWCAD As the flagship product of ZWCAD Software Co., Ltd., ZWCAD is a powerful CAD solution, which is highly compatible with DWG format. ZWCAD meets the needs of broad-based target groups of 2D/3D design industry, including architecture, engineering, construction, mechanics, manufacturing and electronics industries. So far, it has fast become the leading brand in China’s CAD industry and now competes successfully in over 65 countries, with 100,000 users throughout the world. (C) Copyright 2008 ZWCAD Software Co., Ltd. All rights reserved.Owen Zi is author of article written on ZWCAD. He is Director of Overseas Department of ZWSOFT. For more information, please visit: <a href="http://www.zwcad.org">www.zwcad.org</a> or contact ZWCAD team at sales@zwcad.com.
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FTP Servers and Security - Three methods that Secure FTP Servers use
FTP (File Transfer Protocol) has been the basis for file transfer since the dawn of the internet. The truly remarkable feature about FTP was that it was operating system independent. Files could be smoothly transferred between Unix, Windows and any other operating system. The other cool feature about FTP was that a simple validation mechanism consisting of a username and a password could be used to limit access to files. However, the actual data itself was transferred unencrypted and it was easy to intercept and listen in on an FTP connection. The internet itself had very minimal security built into it. Consisting of many smaller independent networks that stretched across the globe, the path that a data packet took to get from point A to point B was unpredictable. With the popularity of the internet, it became essential to be able to transmit many types of critical data with some amount of security. Netscape Communications solved the security problem on the internet by developing the Secure Sockets Layer Protocol (SSL) which used public key cryptography to encrypt data transmitted over the internet. This is still the widely accepted security mechanism and is implemented by all web browsers. FTPS Secure File Transfer Modifications to the FTP protocol were proposed to incorporate the use of SSL for encrypting file transfers over the internet. The modified mechanism is referred to as FTPS. In order to maintain backwards compatibility with the original file transfer protocol, an FTPS connection could either be explicit, where the connection between the client connection and the server starts out as regular FTP and then negotiates a secure connection, or implicit where the connection starts out being encrypted. HTTPS Secure File Transfer Since a web browser is already capable of public key cryptography, simple downloads and uploads can be performed directly through a web browser using the HTTPS protocol. This means that special FTP Client software is not required. SFTP Secure File Transfer The Secure Shell protocol also known as SSH was developed by Tatu Ylonen to enable secure access to remote shells using public key cryptography and replace Telnet and other non secure shells. This protocol has since evolved to also support a file transfer mechanism known as SFTP. The main advantage of this mechanism is that it did not require the opening of an additional data channel connection for transferring files. All of these three methods of secure file transfer are based on public key cryptography and all of them are equally capable of securing the transfer of critical files across the internet. The only drawback of these methods is that there is a data overhead associated with encrypting files. There is also a performance overhead associated with encrypting the files at the source and decrypting them at the destination. Because of this, system administrators sometimes use regular FTP for file transfers within a secured internal network. However, for transferring files over the internet, this is a small price to pay in exchange for the guarantee that sensitive files reach their destination without being intercepted or tampered with.Okay, you now know about the three types of secure ftp servers. If you are looking for a secure FTP server to run on your windows system that can support all three secure file transfer mechanisms, be sure to visit <a href ="http://www.sysax.com/">http://www.sysax.com/</a> and download <a href ="http://www.sysax.com/download.htm?c=48#sysaxserv">Sysax FTP Server</a>
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