Blogware is software designed to simplify the creation and maintenance of weblogs. As specialized content management systems, weblog applications support the authoring, editing, and publishing of blog posts and comments, with special functions for image management, web syndication, and moderation of posts and comments.
Many weblog applications can be downloaded and installed on user systems. Some of them are provided under a free-software or open-source licenses, allowing them to be used, modified, and redistributed freely. Others are proprietary software which must be licensed.
Other weblog applications are offered only through their developers' hosts, either free of charge or for a fee. Services are typically limited to hosting of the blog itself, but some services offer the option of using the hosted software to update a blog published elsewhere.
Maintenance through the Internet is a nearly universal feature of weblog software. This is usually done through a browser-based interface, enabling authors to create and update content on the site. Most software also supports the use of external client software to update content using common APIs such as the MetaWeblog API and the Atom Publishing Protocol.
All weblog software supports authoring, editing, and publishing of entries in the following format.
-Title, the main title, or headline, of the post.
-Body, main content of the post.
-Permalink, the URL of the full, individual article.
-Post Date, date and time the post was published.
Blog entries can optionally include the following:
Comments – Comments allow readers to discuss blog entries, correcting errors or otherwise expressing their opinions on the post or the post's subject.
Categories (or tags) – indexes to subjects discussed by the entry
Trackback and or pingback – links to other sites that refer to the entry
Most weblog applications also have various linking and web syndication features. Web syndication is usually offered in the form of RSS or Atom. This allows other software (such as feed aggregators) to maintain a current summary of the blog's content. Some services and organizations also offer extended features to aid communication, such as the wiki capabilities in Socialtext and Traction TeamPage.
Most weblog applications support English and many other languages. The user selects a language during installation.
Post moderation requires users to register before commenting, or requires individual posts or comments to be approved by a moderator or administrator before they appear in the blog. Weblog applications use various user account systems that allow readers to post comments to a particular blog. For instance, users with Blogger accounts may comment on any Blogger blog. Other weblog applications allow users to post content or comments only to blogs where they have an account.
The posting API varies among different weblog applications. The typical interface is a form to be filled out online, with a varying number of fields. Applications such as Movable Type offer a greater number of form fields and choices than applications such as Blogger. Some applications also have plugins for Firefox that integrate into the browser's menus so that right clicking on selected text on any given web page brings up a small window that allows the user to post directly to their blog.
Most types of blogware support adding thumbnail images within blog posts. Photo blogging is a separate genre of blogging that deals primarily with images.
from Wikipedia, the free encyclopedia
Thursday, November 11, 2010
Monday, November 8, 2010
Video Conferencing
A video conference is a set of interactive telecommunication technologies which allow two or more locations to interact via two-way video and audio transmissions simultaneously. It has also been called 'visual collaboration' and is a type of groupware.
Videoconferencing differs from videophone calls in that it's designed to serve a conference rather than individuals. It is an intermediate form of videotelephony, first deployed commercially by AT&T during the early 1970s using their Picturephone technology.
The core technology used in a videoconferencing system is digital compression of audio and video streams in real time. The hardware or software that performs compression is called a codec (coder/decoder). Compression rates of up to 1:500 can be achieved. The resulting digital stream of 1s and 0s is subdivided into labeled packets, which are then transmitted through a digital network of some kind (usually ISDN or IP). The use of audio modems in the transmission line allow for the use of POTS, or the Plain Old Telephone System, in some low-speed applications, such as videotelephony, because they convert the digital pulses to/from analog waves in the audio spectrum range.
There are basically two kinds of videoconferencing systems:
1.Dedicated systems have all required components packaged into a single piece of equipment, usually a console with a high quality remote controlled video camera. These cameras can be controlled at a distance to pan left and right, tilt up and down, and zoom. They became known as PTZ cameras. The console contains all electrical interfaces, the control computer, and the software or hardware-based codec. Omnidirectional microphones are connected to the console, as well as a TV monitor with loudspeakers and/or a video projector. There are several types of dedicated videoconferencing devices:
(1) Large group videoconferencing are non-portable, large, more expensive devices used for large rooms and auditoriums.
(2) Small group videoconferencing are non-portable or portable, smaller, less expensive devices used for small meeting rooms.
(3) Individual videoconferencing are usually portable devices, meant for single users, have fixed cameras, microphones and loudspeakers integrated into the console.
2.Desktop systems are add-ons (hardware boards, usually) to normal PCs, transforming them into videoconferencing devices. A range of different cameras and microphones can be used with the board, which contains the necessary codec and transmission interfaces. Most of the desktops systems work with the H.323 standard. Videoconferences carried out via dispersed PCs are also known as e-meetings.
Videoconferencing differs from videophone calls in that it's designed to serve a conference rather than individuals. It is an intermediate form of videotelephony, first deployed commercially by AT&T during the early 1970s using their Picturephone technology.
The core technology used in a videoconferencing system is digital compression of audio and video streams in real time. The hardware or software that performs compression is called a codec (coder/decoder). Compression rates of up to 1:500 can be achieved. The resulting digital stream of 1s and 0s is subdivided into labeled packets, which are then transmitted through a digital network of some kind (usually ISDN or IP). The use of audio modems in the transmission line allow for the use of POTS, or the Plain Old Telephone System, in some low-speed applications, such as videotelephony, because they convert the digital pulses to/from analog waves in the audio spectrum range.
There are basically two kinds of videoconferencing systems:
1.Dedicated systems have all required components packaged into a single piece of equipment, usually a console with a high quality remote controlled video camera. These cameras can be controlled at a distance to pan left and right, tilt up and down, and zoom. They became known as PTZ cameras. The console contains all electrical interfaces, the control computer, and the software or hardware-based codec. Omnidirectional microphones are connected to the console, as well as a TV monitor with loudspeakers and/or a video projector. There are several types of dedicated videoconferencing devices:
(1) Large group videoconferencing are non-portable, large, more expensive devices used for large rooms and auditoriums.
(2) Small group videoconferencing are non-portable or portable, smaller, less expensive devices used for small meeting rooms.
(3) Individual videoconferencing are usually portable devices, meant for single users, have fixed cameras, microphones and loudspeakers integrated into the console.
2.Desktop systems are add-ons (hardware boards, usually) to normal PCs, transforming them into videoconferencing devices. A range of different cameras and microphones can be used with the board, which contains the necessary codec and transmission interfaces. Most of the desktops systems work with the H.323 standard. Videoconferences carried out via dispersed PCs are also known as e-meetings.
Thursday, November 4, 2010
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