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Cloud Computing – TECHNOLOGY and WWW
Image via Wikipedia
Intro
The much talked about Cloud Computing promises to change the way Information Technology People look at delivering IT and the way business people perceive it. This one is now a general and important part of IT.
What is “Cloud” & Why it is Connected to Computing?
The name cloud computing was inspired by the cloud symbol that’s often used to represent the Internet in flow charts and diagrams. Cloud Computing is a general term for anything that involves delivering hosted services over the Internet. 
Services? What Services?
The services are broadly devided into three catagories:
• Infrastructure-as-a-Service (IaaS):
Infrastructure as a Service involves Infrastructures, like PC, Laptop, Mobile, Notebook, Mini Note etc..
Plateform-as-a-Service(PaaS):
This involves Plateforms like Remote Server or Database or Remote Desktop.
Software-as-a-Service(SaaS):
SaaS is most important service. It is an application hosted on a remote server and accessed through the Internet. A simple and concrete example of SaaS are the free email systems offered on the internet such as Hotmail, GMail, Yahoo Mail etc. Each program meets the basic criteria of an SaaS application:
•vendor hosts (Microsoft, Google, Yahoo) all of the programs, logic and data in a central location and provides end users access to this data and the software which is run and used over the world-wide-web (WWW).
Profits of Cloud Computing
A cloud service has three distinct characterstics that differentiate it from the traditional hosting.
• It is sold on demand, typically by the minute or the hour.
• It is elastic – a user can have as much or as little of a service as they want at any given time.
• The Service is fully managed by the provides and the consumer offer nothing but a personal computer or a mobile and Internet access.
Significant innovations in virtualization and distributed computing, improved access to high speed internet and a weak economy, have accelerated interest in cloud computing.
Touch Screen Systems
Image via Wikipedia
A typical touchscreen input system is basically an input device like a mouse or trackpad. 
What is?
If counting as a definition, A touch screen is a computer display screen that is sensitive to human touch, allowing a user to interact with the computer by touching pictures or words on the screen.
How?
A touchscreen system is made up of a touch sensor, a controller card, and a software driver. 
WHAT ARE TOUCHSCREENS USED FOR?
Touch screens are used with information kiosks, computer-based training devices, and systems designed to help individuals who have difficulty manipulating a mouse or keyboard. Touchscreen systems are being used in a variety of applications, including point-of-sale systems, public information displays, industrial control systems, and more. 
There are a number of types of touch screen technology:
RESISTIVE:
A resistive touch screen panel is composed of several layers. When some object touches this kind of touch panel, the layers are connected at certain point which registers a touch events and sends it to the controller for processing. Resistive touch screen panels are not affected by dust or water and are the type most commonly used today. 
SURFACE ACOUSTIC WAVE:Surface acoustic wave (SAW) technology uses ultrasonic waves that pass over the touch screen panel. When the panel is touched, a portion of the wave is absorbed. This information is sent to the controller for processing.
CAPACITIVE:
A capacitive touch screen panel is coated with indium tin oxide that conducts a continuous electrical current across the sensor. When the sensor’s normal reference state is altered by someone’s finger, electronic circuits measures the resultant ‘distortion’ and informs the controller for processing. Capacitive sensors can either be touch with a bare finger or with a conductive device. Capacitive touch screens are not affected by outside elements and have high clarity.
INFRARED:
This method uses an array of vertical & horizontal IR Sensors that detect the interruption of a modulated light adam near the surface of the screen. InfraRed touch screens are used in many military applications that require a touch panel display.
STRAIN GAUGE:
In this, the screen is spring mounted on the four corners and strain gauges are used to determine deflection when the screen is touched. This technology can also measure the third dimension. This is typically used in exposed public systems such as ticket machines due to their resistance to vandalism. There are several other technologies like Optical imaging, Dispersive Signal Technology, Acoustic Pulse Recognition, Frustrated total internal reflection and Diffused laser imaging.
Related Articles
- Interactive projector that turns any flat surface into a touch screen wins UK design award (gizmag.com)
- Rumor – Apple orders capacitive screens for upcoming touchscreen iMac (edibleapple.com)
- Top 10 Touchscreen Monitors (brighthub.com)
- Hitachi Developing Capacitive Screen that Works with Styli (pocketnow.com)
Congratulations to WordPress!
Greeting my wishes to WP after achieving 1million Mobile users. I am proudly one of them.
WordPress has done a great job after launching wordpress mobile. But I use wordpress mobile by its mobile site…i.e. http://m.wordpress.com/ because WP app for Nokia is not available in my country India. I hope WP will survive it soon for Indian. Wishes for Future to WordPress.
