Friday, July 15, 2011
Thursday, July 14, 2011
quiz 3
Text consists of characters (letters, numbers, punctuation marks, or any other symbol requiring one byte of computer storage space) that are used to create words, sentences, and paragraphs. Graphics are digital representations of non text information such as drawings, charts, photographs, and animation (a series of still images in rapid sequence that gives the illusion of motion). Audio is music, speech, or any other sound. Video consists of images played back at speeds to provide the appearance of full motion
2. The characteristics of LCD monitors, LCD screens, plasma monitors, and HDTVs.
- LCD Monitor- ultra-slim, stylish,full color display devices for the PC that fit in any part of the home or office.
- LCD Screens- lightweight, aesthetically appealing, energy efficient and long-term cost effective.
- Plasma Monitors- produce rich colors along with very deep blacks,wide viewing angles allow more people to be able to watch TV comfortably, pixels of Plasma TV’s are lit individually so the pixels can be completely turned off to display truck black colors.
- HDTVs- black level, brightness, contrast, color saturation, image processing, screen composition, tuners and cable card.
3. What are the components inside the systems units.
Processor
Memory
Adapter Cards
.Sound Card
.Modem card
.Video Card
.Network Card
Ports
Drive Bays
Power Supply
4. The components of a processor and how they complete a machine cycle.
Components of a Processor
- Control unit -- responsible for supervising the operation of the entire computer system.
- Arithmetic/logic unit (ALU) -- provides the computer with logical and computational capabilities.
- Register -- a storage location inside the processor.
What is a machine cycle?
· Four operations of the CPU comprise a machine cycle
· Also called instruction cycle
- Instruction time (i-time) - time taken to fetch and decode
- Execution time (e-time) - time taken to execute and store
An example of a machine cycle
· Student enters math problem (100 x 52) into computer’s memory
· Result in memory displays on monitor’s screen
5. Define a bit and describe how a series of bits represents data.
Eight bits group together as a unit.
Provides different combination of 0s and 1s to represent 256 individual characters.
- Numbers
- Upper Case and Lower case letters
- Punctuation Marks
Step 2 An electronic signal o for the letter is sent to the system unit.
Step 3 The signal for the letter is converted to its coding system and its stored in memory for processing.
Step 4 After processing, the code for the letter is converted to an image, and displayed on an output device.
6. Identify the categories of application software.
Categories of Application Software:
- Personal productivity Applications
- Multimedia and Graphics applications
- Communications applications
- Home and Educational
7. Identify the key features of widely used business programs.
The Key Features in Business programs in terms of software is editing and typing and other stuff knowing what letters to use like formating.
8. What are the advantages of using application software on the Web.
Using web authoring software can help build web pages faster, an advantage if you are facing a deadline or a large project. There are several different types of web authoring software you can use to make great web pages without having to know all of the ins and outs of web page creation.
9. History of the Internet.
The history of the Internet starts in the 1950s and 1960s with the development of computers. This began with point-to-point communication between mainframe computers and terminals, expanded to point-to-point connections between computers and then early research into packet switching. Packet switched networks such as ARPANET, Mark I at NPL in the UK, CYCLADES, Merit Network, Tymnet, and Telenet, were developed in the late 1960s and early 1970s using a variety of protocols. The ARPANET in particular led to the development of protocols for internetworking, where multiple separate networks could be joined together into a network of networks.
In 1982 the Internet Protocol Suite (TCP/IP) was standardized and the concept of a world-wide network of fully interconnected TCP/IP networks called the Internet was introduced. Access to the ARPANET was expanded in 1981 when the National Science Foundation (NSF) developed the Computer Science NetworkNSFNET provided access to supercomputer sites in the United States from research and education organizations. The ARPANET was decommissioned in 1990. Commercial internet service providers (ISPs) began to emerge in the late 1980s and 1990s and the Internet was commercialized in 1995 when NSFNET was decommissioned, removing the last restrictions on the use of the Internet to carry commercial traffic. (CSNET) and again in 1986 when
Since the mid-1990s the Internet has had a drastic impact on culture and commerce, including the rise of near instant communication by electronic mail, instant messaging, Voice over Internet Protocol (VoIP) "phone calls", two-way interactive video calls, and the World Wide Web with its discussion forums, blogs, social networking, and online shopping sites. The research and education community continues to use advanced networks such as NSF's very high speed Backbone Network Service (vBNS) and Internet2. Increasing amounts of data are transmitted at higher and higher speeds over fiber optic networks operating at 1-Gbit/s, 10-Gbit/s, or more. The Internet continues to grow, driven by ever greater amounts of online information and knowledge, commerce, entertainment and social networking.
10. What are diferent storage devices.
Hard Drive (Internal)
Internal Hard Drive
You computer's hard drive is the first most important type of storage. Anything that you download, applications that you install, your pictures, videos and music are all stored directly to your hard drive. Basically, anything that is on your computer is stored to your internal hard drive. Internal hard drive capacity is measured in gigabytes. For example, you may have a 500GB SATA hard drive on your computer. Also, internal computer hard drives have different speeds such as 5400RPM and 7200RPM. This reading is the speed that the hard drive disk spins. A faster hard drive will have higher RPM. The faster the hard drive spins, the faster your hard drive can read data, as well as write data.
2. External Hard Drives
External Hard Drive
External hard drives are exactly the same as internal drives, with one exception. Rather then being enclosed inside your computer, external hard drives have their own separate casing and sit externally to your computer. External hard drives can connect to your computer in a variety of ways. Some common connection types are: USB 2.0, ESATA, Firewire 400 and Firewire 800. External hard drives measure capacity in gigabytes and have different speeds as well. For the most part, external hard drives are used for backup and storing files that a computer user may want to transport.
3. Network Attached Storage
NAS Server
Another common form of computer storage is network attached storage or NAS. Network attached storage is a method commonly used by businesses to share files between computers. A NAS is simply a storage device connected to a computer network. This is beneficial because many computers can read and write to a NAS. Network attached storage capacity is measured in gigabytes. Also, NASs are available with different hard drive speeds.
Many at home computer users often create their own NAS devices by connecting an external hard drive to their router. This allows them to access it wirelessly, as well as share it with other computers.
4. Optical Media Storage
Optical Drive
Optical media storage is basically writing data to a CD or DVD. When your burn a CD, you are storing songs and music on the CD so that you can listen to it later. If you are burning a DVD, you are storing a video on it so that you can watch it later. CD-RW and DVD-RW media has the capability to be recorded on and erased later if necessary. This makes optical media storage ideal for transporting relatively small amounts of data.
5. Flash Drives
Flash Drive
Flash drives, or thumb drives, are one of the newest forms of computer storage. These drives connect to any computer by way of USB. Often times, students as well as business professionals, use flash drives as a simple way to transport text documents to and from work, and to and from school. When flash drives were first released, storage capacity was rather limited. However, companies are now manufacturing flash drives with huge storage capacities, up to 64GB.
Friday, July 8, 2011
Quiz 2: July 08, 2011
1. Describe various types of pen input, and identify other types of input for smart phones.
Light Pen - Light pen is actually one more pointing input gadget. This will pick up on existence of light. It's a hand held pen fashioned gadget having a photocell installed in it's front-end. Once the front-end on the pen is actually touched on the display screen, the actual photocell registers a position associated with display. This kind of instrument also offers a button. An individual points to the actual object that will end up being chosen on the display screen using the light pen after which clicks the button in the pen. Light pen gadgets are utilized by technical engineers, visual creative designers and so on. These types of gadgets call for unique displays. Light pen can be used on PDA's and also other kinds of portable computers.
The electrical light pen input instrument is usually combined with creating computer software. Designed screen data files are usually joined using a light pen simply by directing it to display positions. A new place shows up on the screen in the area exactly where pen is placed which is sensed through the photocell. The pc software operated the feedback transmission of the instrument.
Digitizer - A Digitizer is also called a graphic tablet and uses a pen input device. It's a flat, rectangle-shaped digital plastic material pad. Every position to the digitizer points to matching video display. It's primarily useful for producing road maps and also engineering blueprints. The actual input gadgets stylus pen and also cursor can be used to trace sketches and also drawings to the digitizer.
Whenever you sketch upon the digitizer with the aid of the stylus pen or cursor, this converts the actual actions associated with stylus or cursor straight into electronic signals which are afterwards routed to the laptop or computer. Therefore a digitizer makes it simple to key in free-hand sketching in to a laptop or computer.
Stylus and Cursor - Stylus pen is actually like a ballpoint pen. It's utilized to compose textual content or make lines (or generate drawings and also pictures) on the exclusively developed graphics display or digitizer. Pen input devices found in several sophisticated graphic devices is called Digital Pen. Generally electronic digital pen supplies much more performance compared to stylus pen.
Stylus pen can be used in graphic programs for instance Computer Aided Design (CAD) and also engineering blueprints and so forth. It's got the convenience of removing textual content as well as lines.
Several portable personal computers make use of touch screens which permit someone to enter any data and even to enable selections in the monitor utilizing a stylus pen or a digital pen. PDA's utilize pen input devices along with tablet Computers quite often use a digital pen. These laptop or computer operates one-of-a-kind platforms also known as optical character recognition. Such a program converts written characters along with symbols to a mode which the computer systems may use and also process all of them.
The actual cursor is surely an input product. It's also used to trace sketches and also drawings with a graphic tablet or perhaps digitizer. This appears like some sort of computer mouse, with the exception of it's got a window using cross hairs, therefore the end user is able to see through to the actual digitizer. Cursor is generally known as Puck.
2. The purpose of various game controllers: gamepads, joysticksand wheels, light guns, dance pads,
and motion-sensing game controllers.
A game pad, also known as a joy pad, is the most common kind of game controller. They are held in both hands with thumbs and fingers used to provide input. Game pads can have a number of action buttons combined with one or more omnidirectional control sticks or buttons. Action buttons are generally handled with the digits on the right hand, and the directional input handled with the left. Gamepads are the primary means of input on nearly all modern video game console. Due to the ease of use and precision of gamepads, they have spread from their origin on traditional consoles to computers, where a variety of games and emulators support their input.
This joystick is a peripheral that consists of a handheld stick that can be tilted around either of two axes and (sometimes) twisted around a third. The joystick is often used for flight simulators..
The steering wheel, essentially a larger version of a paddle, is used in most racing arcade games as well as more recent racing simulators.
A light gun is a peripheral used to "shoot" targets on a screen. They usually roughly resemble firearms or ray guns. Their use is normally limited to rail shooters.
A dance pad, also known as a dance mat, dance platform, or jitter deck is a flat electronic game controller used for input in dance games. Most dance pads are divided into a 3×3 matrix of square panels for the player to stand on, with some or all of the panels corresponding to directions or actions within the game. Some dance pads also have extra buttons outside of the main stepping area, such as "Start" and "Select". Pairs of dance pads are often joined side-by-side for certain gameplay modes.
3. Explain how resolution affects the quality of a picture captured on a
digital camera.
Image resolution describes the detail an image holds. The term applies to raster digital images, film images, and other types of images. Higher resolution means more image detail.
Image resolution can be measured in various ways. Basically, resolution quantifies how close lines can be to each other and still be visibly resolved. Resolution units can be tied to physical sizes (e.g. lines per mm, lines per inch), to the overall size of a picture (lines per picture height, also known simply as lines, or TV lines), or to angular subtenant. Line pairs are often used instead of lines; a line pair comprises a dark line and an adjacent light line. A Line (or TV line, TVL) is either a dark line or a light line.
4. Describe the uses of voice recognition, Web cams, and video conferencing.
Voice recognition is the process of taking the spoken word as an input to a computer program. This process is important to virtual reality because it provides a fairly natural and intuitive way of controlling the simulation while allowing the user's hands to remain free.
A web cam is a video camera which feeds its images in real time to a computer or computer network.
Video calling support has also been added to several popular instant messaging programs.
A video conference or video conference (also known as a video teleconference) 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
5. Discuss how various scanners and reading devices work: optical scanners,
optical readers, bar code readers, RFID readers, magnetic stripe card
readers, MICR readers, and data collection devices.
6. Summarize the various biometric devices: fingerprint reader, face
recognition system, hand geometry system, voice verification system,
signature verification system, and iris recognition system
1. Describe various types of pen input, and identify other types of input for smart phones.
Light Pen - Light pen is actually one more pointing input gadget. This will pick up on existence of light. It's a hand held pen fashioned gadget having a photocell installed in it's front-end. Once the front-end on the pen is actually touched on the display screen, the actual photocell registers a position associated with display. This kind of instrument also offers a button. An individual points to the actual object that will end up being chosen on the display screen using the light pen after which clicks the button in the pen. Light pen gadgets are utilized by technical engineers, visual creative designers and so on. These types of gadgets call for unique displays. Light pen can be used on PDA's and also other kinds of portable computers.
The electrical light pen input instrument is usually combined with creating computer software. Designed screen data files are usually joined using a light pen simply by directing it to display positions. A new place shows up on the screen in the area exactly where pen is placed which is sensed through the photocell. The pc software operated the feedback transmission of the instrument.
Digitizer - A Digitizer is also called a graphic tablet and uses a pen input device. It's a flat, rectangle-shaped digital plastic material pad. Every position to the digitizer points to matching video display. It's primarily useful for producing road maps and also engineering blueprints. The actual input gadgets stylus pen and also cursor can be used to trace sketches and also drawings to the digitizer.
Whenever you sketch upon the digitizer with the aid of the stylus pen or cursor, this converts the actual actions associated with stylus or cursor straight into electronic signals which are afterwards routed to the laptop or computer. Therefore a digitizer makes it simple to key in free-hand sketching in to a laptop or computer.
Stylus and Cursor - Stylus pen is actually like a ballpoint pen. It's utilized to compose textual content or make lines (or generate drawings and also pictures) on the exclusively developed graphics display or digitizer. Pen input devices found in several sophisticated graphic devices is called Digital Pen. Generally electronic digital pen supplies much more performance compared to stylus pen.
Stylus pen can be used in graphic programs for instance Computer Aided Design (CAD) and also engineering blueprints and so forth. It's got the convenience of removing textual content as well as lines.
Several portable personal computers make use of touch screens which permit someone to enter any data and even to enable selections in the monitor utilizing a stylus pen or a digital pen. PDA's utilize pen input devices along with tablet Computers quite often use a digital pen. These laptop or computer operates one-of-a-kind platforms also known as optical character recognition. Such a program converts written characters along with symbols to a mode which the computer systems may use and also process all of them.
The actual cursor is surely an input product. It's also used to trace sketches and also drawings with a graphic tablet or perhaps digitizer. This appears like some sort of computer mouse, with the exception of it's got a window using cross hairs, therefore the end user is able to see through to the actual digitizer. Cursor is generally known as Puck.
2. The purpose of various game controllers: gamepads, joysticksand wheels, light guns, dance pads,
and motion-sensing game controllers.
A game pad, also known as a joy pad, is the most common kind of game controller. They are held in both hands with thumbs and fingers used to provide input. Game pads can have a number of action buttons combined with one or more omnidirectional control sticks or buttons. Action buttons are generally handled with the digits on the right hand, and the directional input handled with the left. Gamepads are the primary means of input on nearly all modern video game console. Due to the ease of use and precision of gamepads, they have spread from their origin on traditional consoles to computers, where a variety of games and emulators support their input.
This joystick is a peripheral that consists of a handheld stick that can be tilted around either of two axes and (sometimes) twisted around a third. The joystick is often used for flight simulators..
The steering wheel, essentially a larger version of a paddle, is used in most racing arcade games as well as more recent racing simulators.
A light gun is a peripheral used to "shoot" targets on a screen. They usually roughly resemble firearms or ray guns. Their use is normally limited to rail shooters.
A dance pad, also known as a dance mat, dance platform, or jitter deck is a flat electronic game controller used for input in dance games. Most dance pads are divided into a 3×3 matrix of square panels for the player to stand on, with some or all of the panels corresponding to directions or actions within the game. Some dance pads also have extra buttons outside of the main stepping area, such as "Start" and "Select". Pairs of dance pads are often joined side-by-side for certain gameplay modes.
3. Explain how resolution affects the quality of a picture captured on a
digital camera.
Image resolution describes the detail an image holds. The term applies to raster digital images, film images, and other types of images. Higher resolution means more image detail.
Image resolution can be measured in various ways. Basically, resolution quantifies how close lines can be to each other and still be visibly resolved. Resolution units can be tied to physical sizes (e.g. lines per mm, lines per inch), to the overall size of a picture (lines per picture height, also known simply as lines, or TV lines), or to angular subtenant. Line pairs are often used instead of lines; a line pair comprises a dark line and an adjacent light line. A Line (or TV line, TVL) is either a dark line or a light line.
4. Describe the uses of voice recognition, Web cams, and video conferencing.
Voice recognition is the process of taking the spoken word as an input to a computer program. This process is important to virtual reality because it provides a fairly natural and intuitive way of controlling the simulation while allowing the user's hands to remain free.
A web cam is a video camera which feeds its images in real time to a computer or computer network.
Video calling support has also been added to several popular instant messaging programs.
Video security
Webcams are also used as security cameras. Software is available to allow PC-connected cameras to watch for movement and sound, recording both when they are detected; these recordings can then be saved to the computer, e-mailed or uploaded to the Internet. In one well-publicised case,a computer e-mailed out images as the burglar stole it, allowing the owner to give police a clear picture of the burglar's face even after the computer had been stolen.A video conference or video conference (also known as a video teleconference) 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
5. Discuss how various scanners and reading devices work: optical scanners,
optical readers, bar code readers, RFID readers, magnetic stripe card
readers, MICR readers, and data collection devices.
Optical scanner is any scanning technology that converts a physical image, text, or object into a digitized form that can be stored as a 2D image file on a computer.
Optical reader is a device that uses light source to read characters, marks, and codes and then converts them into digital data.
Bar code reader uses laser beams to read bar codes.
RFID reader reads information on the tag via radio waves.
Magnetic stripe card reader reads the magnetic stripe on the back of a credit card.
MICR readers can read text printed with magnetized ink.
Data collection devices obtain data directly at location where transaction or event takes place. They transmit data over network or Internet.
6. Summarize the various biometric devices: fingerprint reader, face
recognition system, hand geometry system, voice verification system,
signature verification system, and iris recognition system
Fingerprint scanner captures curves and indentations of fingerprint.
Hand geometry system measures shape and size of person’s hand.
Voice recognition system compares live speech with stored voice pattern.
Signature verification system recognizes shape of signature.
Iris recognition system reads patterns in blood vessels in back of eye.
Face recognition system is a computer application for automatically identifying or verifying a person from a digital image or a video frame from a video source. One of the ways to do this is by comparing selected facial features from the image and a facial database.
Thursday, July 7, 2011
just think......
What is more painful?
When the person whom you trust, hurts you?
or
the person whom you hurt, still trust you?
Just think.........
Tuesday, July 5, 2011
Quiz-Comped321
1. What is input?
n.) Whatever goes into the computer. Input can take a variety of forms, from command you enter from the keyboard to data from another computer or device. A device that feeds data into a computer, such as a keyboard or mouse, is called an input device.
(v.) The act of entering data into a computer.
Differentiate in terms of:
Program
(n) An organized list of instructions that, when executed, causes thecomputer to behave in a predetermined manner. Without programs, computers are useless.
A program is like a recipe. It contains a list of ingredients (called variables) and a list of directions (called statements) that tell the computer what to do with the variables. The variables can represent numeric data, text, or graphical images.
There are many programming languages -- C, C++, Pascal, BASIC, FORTRAN, COBOL, and LISP are just a few. These are all high-level languages. One can also write programs in low-level languages called assembly languages, although this is more difficult. Low-level languages are closer to the language used by a computer, while high-level languages are closer to human languages.
Eventually, every program must be translated into a machine language that the computer can understand. This translation is performed by compilers, interpreters and assemblers.
When you buy software, you normally buy an executable version of a program. This means that the program is already in machine language -- it has already been compiled, and assembled and is ready to execute.
Command
An instruction to a computer or device to perform a specific task. It come in different forms. They can be:
- FunctionKeys
- buttons or other graphical objects on your screen
Every program that interacts with people responds to a specific set of commands. The set of commands and the syntax for entering them is called the user interface and varies from one program to another.
The DOS operating system makes a distinction between internal and external commands. Internal command are commands, such as COPY and DIR, that can be handled by the COMMAND.Com program. External commands include the names of all other COMFiles as well asEXE and BAT Files
Another word for command is directive.
User Response
2. Common Keys and buttons on a desktop computer keyboards
A keyboard typically has characters engraved or printed on the keys and each press of a key typically corresponds to a single written symbol. However, to produce some symbols requires pressing and holding several keys simultaneously or in sequence. While most keyboard keys produce letters, numbers or signs (characters), other keys or simultaneous key presses can produce actions or computer commands.
Space Tab,The Escape Key (often abbreviated Esc),The Menu Key or Application key is a key found on Windows-oriented computer keyboards. It is used to launch a context menu with the keyboard rather than with the usual right mouse button.The Break Key or Pause Key.
Navigation keys include a variety of keys which move the cursor to different positions on the screen. Arrow Keys are programmed to move the cursor in a specified direction; page scroll keys, such as the 'Page Up and Page Down Keys', scroll the page up and down. The Home Key is used to return the cursor to the beginning of the line where the cursor is located; the End Key puts the cursor at the end of the line. The Tab Key advances the cursor to the next tab stop.
The Insert Key is mainly used to switch between over type mode, in which the cursor overwrites any text that is present on and after its current location, and insert mode, where the cursor inserts a character at its current position, forcing all characters past it one position further. The Delete Key discards the character ahead of the cursor's position, moving all following characters one position "back" towards the freed place. On many notebook computer keyboards the key labeled Delete (sometimes Delete and Backspace are printed on the same key) serves the same purpose as a Backspace key. The Backspace key deletes the preceding character.
Lock Keys lock part of a keyboard, depending on the settings selected. The lock keys are scattered around the keyboard. Most styles of keyboards have three LEDs indicating which locks are enabled, in the upper right corner above the numpad. The lock keys include Scroll Lock, Num Lock (which allows the use of the numeric keypad), and Caps Lock
Modifiers
The most widely-used modifier keys include the Control Key, Shift Key and the Alt Key. The AltGr Key is used to access additional symbols for keys that have three symbols printed on them. On the Macintosh and Apple keyboards, the modifier keys are the Option Key and Command key, respectively. On MIT computer keyboards, the Meta Key is used as a modifier and for Windows keyboards, there is a Windows Key. Compact keyboard layouts often use a Fn Key. "Dead Keys" allow placement of a diacritic mark, such as an accent, on the following letter (e.g., the Compose key).
The Enter/Return Key typically causes a command line, window form or dialog box to operate its default function, which is typically to finish an "entry" and begin the desired process. In word processing applications, pressing the enter key ends a paragraph and starts a new one.
Differences between mobile computer keyboard to desktop computer.
MOBILE PHONE KEYPAD
The "*" is called the "star key" or "asterisk key". "#" (while technically referred to as "octothorpe") is called the "number sign", "pound key", or "hash key", depending on one's nationality or personal preference. These can be used for special functions.
Most of the keys also bear letters according to the following system:
The "*" is called the "star key" or "asterisk key". "#" (while technically referred to as "octothorpe") is called the "number sign", "pound key", or "hash key", depending on one's nationality or personal preference. These can be used for special functions.
Most of the keys also bear letters according to the following system:
- 0 = none (in some telephones, "OPERATOR" or "OPER")
- 1 = none (in some older telephones, QZ)
- 2 = ABC
- 3 = DEF
- 4 = GHI
- 5 = JKL
- 6 = MNO
- 7 = P(Q)RS
- 8 = TUV
- 9 = WXY(Z)
3. Different mouse types
One of the most interesting mouse technologies invented is the wireless mouse which relies infrared, radio signals or Bluetooth to communicate with the computer. Using no cord, the wireless mouse contains a transmitter to send information to a receiver itself connected to the computer. The wireless mouse is usable from 2m to 10m of the computer.
The cordless mouse uses the wireless communication technology (via infrared, radio or Bluetooth) to transmit data to the computer. And like the wireless, it doesn’t use any cord.
Other specification to consider about different type of mice is the function of the buttons. Depending on the manufacturer a computer mouse can have 1 to 4 buttons. However the most commonly used is the two mouse buttons of which the primary button is located to the left side of the mouse.
Especially for computer games players, some mice have been built with five or more extensive arrays of buttons which give easily access to various functions.
Finally each of the different type of computer mouses seems more usable with the scroll wheel, very effective with long document pages. As a matter of fact the scroll wheel can be rotated up and down to navigate within a page as the arrows “up and down” buttons on the keyboard.
Sometimes instead of the scroll wheel, a center button or a “rocker” button is designed to the same effects. But they have to be pressed at the top or bottom to achieve the same tasks.
4. different types of touch screen
Resistive touchscreen panel is composed of several layers, the most important of which are two thin, electrically conductive layers separated by a narrow gap. When an object, such as a finger, presses down on a point on the panel's outer surface the two metallic layers become connected at that point: the panel then behaves as a pair of voltage dividers with connected outputs. This causes a change in the electrical current, which is registered as a touch event and sent to the controller for processing. Surface acoustic wave (SAW) technology uses ultrasonic waves that pass over the touchscreen panel. When the panel is touched, a portion of the wave is absorbed. This change in the ultrasonic waves registers the position of the touch event and sends this information to the controller for processing. Surface wave touchscreen panels can be damaged by outside elements. Contaminants on the surface can also interfere with the functionality of the touchscreen. A capacitive touchscreen panel is one which consists of an insulator such as glass, coated with a transparent conductor such as indium tin oxide (ITO). As the human body is also an electrical conductor, touching the surface of the screen results in a distortion of the screen's electrostatic field, measurable as a change in capacitance. Different technologies may be used to determine the location of the touch. The location is then sent to the controller for processing. Unlike a resistive touchscreen, one cannot use a capacitive touchscreen through most types of electrically insulating material, such as gloves; one requires a special capacitive stylus, or a special-application glove with finger tips that generate static electricity. This disadvantage especially affects usability in consumer electronics, such as touch tablet PCs and capacitive smartphones. An infrared touchscreen uses an array of X-Y infrared LED and photodetector pairs around the edges of the screen to detect a disruption in the pattern of LED beams. These LED beams cross each other in vertical and horizontal patterns. This helps the sensors pick up the exact location of the touch. A major benefit of such a system is that it can detect essentially any input including a finger, gloved finger, stylus or pen. It is generally used in outdoor applications and point of sale systems which can't rely on a conductor (such as a bare finger) to activate the touchscreen. Unlike capacitive touchscreens, infrared touchscreens do not require any patterning on the glass which increases durability and optical clarity of the overall system. Optical imaging is a relatively modern development in touchscreen technology, in which two or more image sensors are placed around the edges (mostly the corners) of the screen. Infrared back lights are placed in the camera's field of view on the other side of the screen. A touch shows up as a shadow and each pair of cameras can then be pinpointed to locate the touch or even measure the size of the touching object (see visual hull). This technology is growing in popularity, due to its scalability, versatility, and affordability, especially for larger units. Dispersive signal technology was introduced in 2002 by 3M, this system uses sensors to detect the mechanical energy in the glass that occurs due to a touch. Complex algorithms then interpret this information and provide the actual location of the touch. The technology claims to be unaffected by dust and other outside elements, including scratches. Since there is no need for additional elements on screen, it also claims to provide excellent optical clarity. Also, since mechanical vibrations are used to detect a touch event, any object can be used to generate these events, including fingers and stylus. A downside is that after the initial touch the system cannot detect a motionless finger. Acoustic pulse recognition, introduced by Tyco International's Elo division in 2006, uses piezoelectric transducers located at various positions around the screen to turn the mechanical energy of a touch (vibration) into an electronic signal. The screen hardware then uses an algorithm to determine the location of the touch based on the transducer signals. The touchscreen itself is made of ordinary glass, giving it good durability and optical clarity. It is usually able to function with scratches and dust on the screen with good accuracy. The technology is also well suited to displays that are physically larger. As with the Dispersive Signal Technology system, after the initial touch, a motionless finger cannot be detected. However, for the same reason, the touch recognition is not disrupted by any resting objects.
First both techniques utilize the electric charge mechanism to develop a touch screen system but the third uses wave system and do not need a metallic plate. This surface acoustic wave system is free of electric field that’s why there is no resistance in the way of light dispersal. This 100 percent light emission gives extra clarity to the screen which is not possible in first two mechanisms. Resistive system enables 75 % of light emission. However capacitive system allows 90% of light emission so better than resistive. Capacitive system enables sharp image as compared to resistive system even then no comparison with
The mechanical mouse requires a ball to move the cursor on the screen. To get more efficacies with this type of mice, a flat surface named mouse pads is necessary.
The optomechanical or optical-mechanical mouse is a combination of the optical and the mechanical technologies. It uses a ball but detects the mouse movement optically. It is now the most commonly used with PC.
The optical mouse uses a laser; precisely an optical sensor to help detecting the mouse’s moving. More expensive than the two other types, the optical mouses offer more precision and speed and even can be used on any surface.
To be really useful, the mouse has to be connected to your PC. To transmit data to the computer three types of interfaces can be used:
To be really useful, the mouse has to be connected to your PC. To transmit data to the computer three types of interfaces can be used:
The RS-232C serial port connects the mouse to the computer through a thin electrical cord using a 9 pin connector.
The PS/2 port do the same as the first interface mentioned but using a 6 pin connector.
The USB interface receives various types of mice through a USB connector. One of these advantages to use the USB mouse is the possibility to plug-and-play (it) in front or in the back of your computer case, when it contains these kinds of port.
One of the most interesting mouse technologies invented is the wireless mouse which relies infrared, radio signals or Bluetooth to communicate with the computer. Using no cord, the wireless mouse contains a transmitter to send information to a receiver itself connected to the computer. The wireless mouse is usable from 2m to 10m of the computer.
The cordless mouse uses the wireless communication technology (via infrared, radio or Bluetooth) to transmit data to the computer. And like the wireless, it doesn’t use any cord.
Other specification to consider about different type of mice is the function of the buttons. Depending on the manufacturer a computer mouse can have 1 to 4 buttons. However the most commonly used is the two mouse buttons of which the primary button is located to the left side of the mouse.
Especially for computer games players, some mice have been built with five or more extensive arrays of buttons which give easily access to various functions.
Finally each of the different type of computer mouses seems more usable with the scroll wheel, very effective with long document pages. As a matter of fact the scroll wheel can be rotated up and down to navigate within a page as the arrows “up and down” buttons on the keyboard.
Sometimes instead of the scroll wheel, a center button or a “rocker” button is designed to the same effects. But they have to be pressed at the top or bottom to achieve the same tasks.
4. different types of touch screen
Resistive touchscreen panel is composed of several layers, the most important of which are two thin, electrically conductive layers separated by a narrow gap. When an object, such as a finger, presses down on a point on the panel's outer surface the two metallic layers become connected at that point: the panel then behaves as a pair of voltage dividers with connected outputs. This causes a change in the electrical current, which is registered as a touch event and sent to the controller for processing. Surface acoustic wave (SAW) technology uses ultrasonic waves that pass over the touchscreen panel. When the panel is touched, a portion of the wave is absorbed. This change in the ultrasonic waves registers the position of the touch event and sends this information to the controller for processing. Surface wave touchscreen panels can be damaged by outside elements. Contaminants on the surface can also interfere with the functionality of the touchscreen. A capacitive touchscreen panel is one which consists of an insulator such as glass, coated with a transparent conductor such as indium tin oxide (ITO). As the human body is also an electrical conductor, touching the surface of the screen results in a distortion of the screen's electrostatic field, measurable as a change in capacitance. Different technologies may be used to determine the location of the touch. The location is then sent to the controller for processing. Unlike a resistive touchscreen, one cannot use a capacitive touchscreen through most types of electrically insulating material, such as gloves; one requires a special capacitive stylus, or a special-application glove with finger tips that generate static electricity. This disadvantage especially affects usability in consumer electronics, such as touch tablet PCs and capacitive smartphones. An infrared touchscreen uses an array of X-Y infrared LED and photodetector pairs around the edges of the screen to detect a disruption in the pattern of LED beams. These LED beams cross each other in vertical and horizontal patterns. This helps the sensors pick up the exact location of the touch. A major benefit of such a system is that it can detect essentially any input including a finger, gloved finger, stylus or pen. It is generally used in outdoor applications and point of sale systems which can't rely on a conductor (such as a bare finger) to activate the touchscreen. Unlike capacitive touchscreens, infrared touchscreens do not require any patterning on the glass which increases durability and optical clarity of the overall system. Optical imaging is a relatively modern development in touchscreen technology, in which two or more image sensors are placed around the edges (mostly the corners) of the screen. Infrared back lights are placed in the camera's field of view on the other side of the screen. A touch shows up as a shadow and each pair of cameras can then be pinpointed to locate the touch or even measure the size of the touching object (see visual hull). This technology is growing in popularity, due to its scalability, versatility, and affordability, especially for larger units. Dispersive signal technology was introduced in 2002 by 3M, this system uses sensors to detect the mechanical energy in the glass that occurs due to a touch. Complex algorithms then interpret this information and provide the actual location of the touch. The technology claims to be unaffected by dust and other outside elements, including scratches. Since there is no need for additional elements on screen, it also claims to provide excellent optical clarity. Also, since mechanical vibrations are used to detect a touch event, any object can be used to generate these events, including fingers and stylus. A downside is that after the initial touch the system cannot detect a motionless finger. Acoustic pulse recognition, introduced by Tyco International's Elo division in 2006, uses piezoelectric transducers located at various positions around the screen to turn the mechanical energy of a touch (vibration) into an electronic signal. The screen hardware then uses an algorithm to determine the location of the touch based on the transducer signals. The touchscreen itself is made of ordinary glass, giving it good durability and optical clarity. It is usually able to function with scratches and dust on the screen with good accuracy. The technology is also well suited to displays that are physically larger. As with the Dispersive Signal Technology system, after the initial touch, a motionless finger cannot be detected. However, for the same reason, the touch recognition is not disrupted by any resting objects.
There are three different systems used in the mechanism of touch screen.
1. Resistive System
In this resistive mechanism of touch screen two sheets are used one is conductive and the other is resistive. Both cover the top glass panel. There is a space between two sheets so that current pass when it is toggle. Now touching the screen forced both layers to contact at a certain point. This contact of both layers cause in the electric field a variation which is informed to the main system that a touch is felt. OS transcribe the touch into desired action.
2. Capacitive System
Second method utilizes in touch screen is capacitive. To understand this mechanism, it is better to know about human biology first. Many chemical reactions take place in our body and electricity produced in result to perform different functions. That is the reason why human heart is recharged with electric shocks for the recovery. Considering human body a cell you can better understand this phenomenon. In this system an electric charge sheet (capacitor) is directly placed on the glass. When we touch the screen with finger, a static charge produces and reacts with the capacitor (electric charge sheet). As the touch screen works due to electric current develop when touches the finger.
3. Surface Acoustic Wave System
This type of touch screen works with the help of wave energy. This enables a touch to transform into another form of energy and deliver the command which in response perform the desired action. A pair of transducers is placed on glass plate sides. In the glass plate there are reflectors. On touching the screen wave produced and which transforms into energy for fulfilling the command. It tells where on the screen touch is detected.
Important Information
Important Information
First both techniques utilize the electric charge mechanism to develop a touch screen system but the third uses wave system and do not need a metallic plate. This surface acoustic wave system is free of electric field that’s why there is no resistance in the way of light dispersal. This 100 percent light emission gives extra clarity to the screen which is not possible in first two mechanisms. Resistive system enables 75 % of light emission. However capacitive system allows 90% of light emission so better than resistive. Capacitive system enables sharp image as compared to resistive system even then no comparison with
The Man Who Can't Be Moved lyrics
Songwriters: Frampton, Andrew Marcus; Kipner, Stephen Alan; O Donoghue, Daniel John; Sheehan, Mark Anthony;
Songwriters: Frampton, Andrew Marcus; Kipner, Stephen Alan; O Donoghue, Daniel John; Sheehan, Mark Anthony;
Going back to the corner where I first saw you
Gonna camp in my sleeping bag, I'm not gonna move
Got some words on cardboard, got your picture in my hand
Saying if you see this girl can you tell her where I am
Some try to hand me money, they don't understand
I'm not broke I'm just a broken hearted man
I know it makes no sense, but what else can I do
How can I move on when I've been in love with you
'Cause if one day you wake up and find that you're missing me
And your heart starts to wonder where on this earth I could be
Thinking maybe you'll come back here to the place that we'd meet
And you'd see me waiting for you on the corner of the street
So I'm not moving
I'm not moving
Policeman says son you can't stay here
I said there's someone I'm waiting for if it's a day, a month, a year
Gotta stand my ground even if it rains or snows
If she changes her mind this is the first place she will go
'Cause if one day you wake up and find that you're missing me
And your heart starts to wonder where on this earth I could be
Thinking maybe you'll come back here to the place that we'd meet
[ From: http://www.elyrics.net/read/s/script-lyrics/the-man-who-can_t-be-moved-lyrics.html ]
And you see me waiting for you on the corner of the street
So I'm not moving
I'm not moving
I'm not moving
I'm not moving
People talk about the guy
Who's waiting on a girl, oh whoa
There are no holes in his shoes
But a big hole in his world
Maybe I'll get famous as the man who can't be moved
And maybe you won't mean to but you'll see me on the news
And you'll come running to the corner
'Cause you'll know it's just for you
I'm the man who can't be moved
I'm the man who can't be moved
'Cause if one day you wake up and find that you're missing me
And your heart starts to wonder where on this earth I could be
Thinking maybe you'll come back here to the place that we meet
Oh, you see me waiting for you on a corner of the street
So I'm not moving
('Cause if one day you wake up, find that you're missing me)
I'm not moving
(And your heart starts to wonder where on this earth I could be)
I'm not moving
(Thinking maybe you'll come back here to the place that we'd meet)
I'm not moving
(Oh, you see me waiting for you on a corner of the street)
Going back to the corner where I first saw you
Gonna camp in my sleeping bag, I'm not gonna move
Thursday, June 30, 2011
The Value Of A Smile :) | ||
| By Francie Baltazar-Schwartz | ||
The value of a smile is priceless, yet it is the cheapest, easiest, most rewarding and most sincere gift to anyone that crosses your path. A smile makes a person's day, anybody's day even a stranger's day. A smile is infectious. Start infecting people with your smile today. A smile is nature's best antidote for discouragement. It brings rest to the weary, sunshine to those who are sad, and hope to those who are hopeless and defeated. |
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