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Wednesday, October 8, 2008

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To all my blog visitor,try take a second and imagine if the technology of all the video projector that showing this slide is suddenly disappear…

How a lecturer want to show the lecture note?

How a teacher want to preview the syllybus to her student?

How a desingner want to publish her design?

Just think…..how much the important the technology of the video projector today.

Video Projector

  • A video projector takes a video signal and projects the corresponding image on a projection screen using a lens system.
  • • All video projectors use a very bright light to project the image, and most modern ones can correct any curves, blurriness, and other inconsistencies through manual settings.
  • • Video projectors are widely used for conference room presentations, classroom training, and home theatre applications.
  • • Common display resolutions for a portable projector include SVGA (800×600 pixels), XGA (1024×768 pixels), 720p (1280×720 pixels), and 1080p (1920×1080 pixels
  • Projection technologies
  • • CRT projector using cathode ray tubes. This typically involves a blue, a green, and a red tube. Minimal maintenance is required (unlike projectors that use expensive lamps which must be periodically replaced after they burn out). This is the oldest system and falling out of favor largely because of the bulky cabinet. However, it does provide the largest screen size for a given cost. This also covers three tube home models, which, while bulky, can be moved
  • • LCD projector[3] using LCD light gates. This is the simplest system, making it one of the most common and affordable for home theaters and business use. Its most common problem is a visible “screen door” or pixelation effect, although recent advances have minimized this.
  • • DLP projector using Texas Instruments’ DLP technology. This uses one, two, or three microfabricated light valves called digital micromirror devices (DMDs). The single- and double-DMD versions use rotating color wheels in time with the mirror refreshes to modulate color. The most common problem with the single- or two-DMD varieties is a visible “rainbow” which some people perceive when moving their eyes. More recent projectors with higher speed (2x or 4x) and otherwise optimised color wheels have lessened this artifact. Systems with 3 DMDs never have this problem, as they display each primary color simultaneously.
  • • LCOS projector using Liquid crystal on silicon.
  • • D-ILA JVC’s Direct-drive Image Light Amplifier based on LCOS technology.
  • • LED Use an array of Light Emitting Diodes as the light source, negating the need for lamp replacement.

Vandalism

Vandalism is the behaviour attributed to the Vandals in respect of culture: ruthless destructionbeautiful or venerable.[1] Such action includes criminal damage, defacement, graffiti and crass erection of an eyesore. or spoiling of anything

History of the term

Historically, vandalism has been justified by painter Gustave Courbet as destruction of monuments symbolizing "war and conquest". Therefore, it is often done as an expression of contempt, creativity, or both.

Vandalism as crime

Private citizens commit vandalism when they wilfully damage or deface the property of others or the commons. Some vandalism qualifies as culture jamming or sniggling – it is artistic in nature as well as being carried out illegally or without the property owner's permission. Examples include at least some graffiti art, billboard liberation and possibly crop circles, Criminal vandalism has many forms, graffiti on public property is common in many inner cities as part of a gang culture, however other more devastating forms such as those involved with public unrest, such as rioting, involve the wilful destruction of public and private property, Vandalism per se is often considered one of the least serious common crimes, but it can become quite serious and distressing when committed extensively, violently or as an expression of hatred and intimidation.

Examples

Examples of vandalism include salting lawns, cutting trees without permission, egg throwing, breaking windows, arson, spraying paint on others' properties, tagging, placing glue into locks, tire slashing, keying (scratching) paint, ransacking a place and flooding someones house by clogging a sink and leaving the water on, The destruction of glass windows and doors is a form of vandalism, A caution sign damaged by bullet holes.

In the case of vandalism to private property, the owner – the victim, may feel that they were specifically targeted by the perpetrator(s) – this is not necessarily the case. An example of such a crime would be the wilful destruction of a car window for no obvious purpose save to give the perpetrator(s) possibly a few seconds of entertainment, with no consideration, or empathy for the detriment to the state of mind or inconvenience of the victim.

Motives

Reasoning for such actions can be attributed to anger, envy or spontaneous, opportunistic behaviour – possibly for peer acceptance or bravado in gang cultures, or disgruntlement with the target (victim) person or society. Opportunistic vandalism of this nature may also be filmed, the mentality of which can be akin to happy slapping. The large scale prevalence of gang graffiti in some inner cities has almost made it acceptable to the societies based there – so much so that it may go unnoticed, or not be removed, possibly because it may be a fruitless endeavour, to be graffitied on once again.

Reaction of authorities

In view of its incivility, punishment for vandalism can be particularly severe in some countries. In Singapore, for example, a person who attempts to cause or commits an act of vandalism may be liable to imprisonment for up to 3 years and in conjunction may be punished with caning. The act of vandalism in UK is construed as an environmental crime and may be dealt with an ASBO (Anti-Social Behavior Order).

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