Famous Deaf People
There are many famous deaf people who have continued to awe people, since the late 1700's when the famous composer Ludwig Van Beethoven eventually lost his hearing and continued to compose. This article is an attempt to pay tribute to those people who stood high in all walks of life.
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Contributors from the Deaf World
Ludwig Van Beethoven (1770-1827)
William Willard (1809-1881)
Laura Dewey Bridgman (1829-1889)
Hellen Keller (1880-1968)
Dr. Frank G. Bowe
Linda Bove
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Beethoven was a famous composer and musician. Although he wasn't born deaf, he lost his hearing ability at an early age. It is said, after his first public performance of his ninth symphony he cried when he was turned around in order to see the audience's response to the music. His musical talent was recognized early on. He had the opportunity to meet Mozart in 1787 and had wanted to study under him in 1796, but could not do so. Instead, he studied under Joseph Haydn instead. Beethoven went on to live a full life as composer and musician.
William Willard (1809-1881)
William Willard was born in Battleboro, VT, and after he married a young deaf teacher, (he also being deaf), they moved to Indianapolis, Indiana. Together, they set up a school for the deaf. He had the previous approvals from the state officials, that helped him lay foundation of the Indianapolis School for the Deaf in 1843. This school was officially recognized in 1846 and Indiana became the sixth state to provide free education to the deaf.
Laura Dewey Bridgman (1829-1889)
Laura Bridgman, was the first blind and deaf person to learn the English language. She was born normal, but was hit with a bout of Scarlet fever when she was two years old. This ailment caused her to become a blind deaf-mute, just like Hellen Keller years later. She entered the Perkins School for the Deaf and Blind in 1837. Dr. Howe, principal of the school, taught her how to recognize everyday items such as knives and spoons by assisting her to associate them with labels with the raise letters spelling "knife" or "spoon" and later teaching her to recognize the items without the labels. This eventually end up teaching her how to spell the various words that she had learned using the above method. This makes her one of the famous deaf-mute people.
Hellen Keller (1880-1968)
Hellen Keller's early life is almost similar to that of Laura Bridgman. She too was born a normal child and at 19 months of age developed Scarlet fever. This illness left her deaf and blind. From this time until she was six years old, she had only one friend, a family servant named Martha Washington. This was because her family didn't have any idea of how to communicate with her. This is often the case with deaf and blind children, especially those born deaf and blind.
However, her mother read about Laura Bridgman and immediately sought Alexander Graham Bell's help (who had a deaf mother and a deaf wife) concerning possible education for her daughter Hellen. He recommended that she take Hellen to the same school that Laura Bridgman attended, Perkins Institute for the Deaf and Blind. It was there that Hellen met Anne Sulivan, who would be both her companion for nearly 50 years.
Hellen went on to eventually learn to speak. She spoke out for the blind and did all she could to prevent it. She went to the sweatshops in New York and spoke for the children that worked there. She spoke about the working class and became a socialist from 1909-1921. She went on to meet every president from Grover Cleaveland to Lyndon B. Johnson and met many celebrities as well. She was instrumental in bringing the Akito dog breed from Japan to America and in 1920 she helped to form the ACLU. She passed away in 1968, just days before she would turn 88 years old.
Dr. Frank G. Bowe (1947-August 21, 2007)
He was a distinguished professor at Hofstra University and has accomplished much as a disability rights activist, teacher and author. He was the first to represent specially abled people at the UN when they planned the IYDP in 1981. Dr. Bowe headed many organizations that assists both deaf and differently abled people. He wrote "Handicapping America" which points out various ways that we have handicapped people with disability instead of helping them. His name features in many 'Who's Who' publications, such as Who's Who in the World and Who's Who in Education and many others. He has received multiple awards for his contributions towards the specially abled.
Linda Bove (November 30, 1945)
Linda Bove, is a deaf American actress. She was born to parents who were both deaf. She attended the St. Joseph School for the Deaf in Bronx, New York. She graduated from the Marie Katzenbach School for the Deaf in New Jersey. She is known as Linda the Librarian on Sesame Street and has made a huge contribution in introducing the sign language to hearing children.
These people are some of those whose contributions have shaped both the deaf world and the world in general. We would not have great classical music, education for the deaf and blind and the many other great contributions were it not for these great people and their abilities.
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Disabilities
Comprehensive guide to various physical, mental and developmental disabilities and rehabilitation. Throughout the world, there are millions of people who have some form of emotional, mental, or physical handicap that can limit their activities to varying degrees. The terms disabled and differently abled are both preferable terms to the outdated term handicapped. Disabilities can be the result of accidents, resulting in paralysis, brain damage, etc., while some people are born with such afflictions as cerebral palsy, spina bifida, Down syndrome, muscular dystrophy, blindness, etc. This guide offers disability facts, statistics, information and resources on a list of disabilities covering several mental, physical, and emotional handicaps and the necessary assessment, treatment for people with disabilities, and advocacy of it in both public and private arenas. Disability facts and information for parents of children with physical disabilities and medical issues. Disability resources to learn about accessibility, disabled assistance, developmental and learning disabilities in physically handicapped children, disabilities rights and parenting kids with disabilities.
List of Disabilities
- Developmental Disabilities
- Mental Disabilities
- Physical Disabilities
- Visual Impairment
- Hearing Impairment
- Mobility Impairment
- Head Injury
- Chronic Illnesses
- Other Disabilities
- Substance Abuse / Addictions
Computer Devices for the Blind
A screen reader is probably one of the best computer devices for the blind. In this article, you will come to know about computer devices for visually impaired people...
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Operating a computer and its accessories requires you to see the screen and follow instructions. It is quite easy for us as we have got used to it. However, have you every thought how blind people would use computers? Fortunately, there have been many tools and utilities invented that aid visually challenged individuals to use computers in a way that normal people do. These tools are referred to as adaptive computer technology. 
Useful Computer Devices for the Blind
Screen Readers or Optical Character Recognition Applications
As the name suggests, screen readers are adaptive applications that do the job of converting text on the screen to audio. These are able to read web pages, menus, dialog boxes, and other computer visuals. Some of the best products are JAWS, Window-Eyes, Dolphin Supernova, and ZoomText Magnifier/Reader. There are even other products known as optical character recognition apps which read out content from the screen, with the user being given the freedom to control the speed of reading. Good OCR applications include ABBYY FineReader, LEADTOOLS, OmniPage, etc.
Braille Embosser
A Braille embosser, also referred to as a Braille printer, is an impact printer that is used for the purpose of converting text to an embossed surface on a special type of paper that can be felt and read by a blind person. Normal paper can also be used, but only on high-end embossers. The price of good Braille embossers start from $2,000 and may go in several thousands, as per the need. You can go in for models such as Thomas Pro, Marathon, Romeo Attaché Pro, Viewplus Elite 150, Emprint SpotDot, just to name a few.
Braille Computer Monitor
This is another assistive device for blind people from the Braille system. The Braille computer monitor is one with rectangular cells arranged in rows and columns of dots. The up and down movement of these dots is controlled by electromechanical impact drivers and elastomeric cords. These monitors can also be used as output devices for working with screen readers. Earlier, refreshable Braille display technology was used, which used the same functioning concept for helping blind people feel and read matter on display.
Speech Control Interface
Speech control software is found in almost all computers and standard electronic devices. This technology uses voice commands to interact with and control the interface on screen. The computer should necessarily have a mic and speaker system for inputs. It enables users to select and browse through files and folders, draw pictures, type, and so on. On a PC with Windows OS, the person will have to use the Accessibility Wizard to customize this interface; whereas for Mac users, Universal Access is the option.
Magnification Software
One of the most commonly used computer devices for the physically challenged in sight is magnification software. This application is not for the totally blind but, those who have a weak sight and are considered legally blind. As the name suggests, these software magnify text and pictures on the screen up to many times. Some applications even have the feature of changing color of the matter for a clearer view. You have good choices such as MAGic Professional, Supernova Pro, WinZoom, ZoomText, and LunarPlus Enhanced Screen Magnifier. You can buy these apps in just under a $1,000.
These computer assistive software and hardware have certainly proven beneficial for visually challenged individuals to perform computing tasks efficiently. Using touch and audio resources collectively really helps blind people operate computers more effectively. A good example can be of using a Braille computer monitor with a speech reader on a speech control interface.
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Computer Devices for the Physically Challenged
Various computer devices for the physically challenged have made their life a lot easier, helping them to face the world against all odds. It wouldn't be surprising to know that many among us are not even aware of these devices, which have shown a new ray of hope for millions around the world.
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Until a few years ago, being physically challenged was a curse that made life miserable for the individual, by making him dependent on others for basic survival. But things have changed today, thanks to significant advancements achieved in various sciences. Powered with some of the technological marvels of recent times, even physically challenged individuals have become successful in carving a niche for themselves, thus becoming independent against all odds. The world today is largely dependent on computers, therefore not being aware of the tricks of this trade is bound to make a person feel left out. This was the case with people with disabilities until computer devices for the physically challenged were introduced one by one over the last decade.
How do People with Disabilities use Computer?
Physically challenged individuals require alternative input devices in order to use the computer. These devices range from voice recognition programs to alternative computer keyboards. These devices for the physically challenged provide them with adaptive options, in the form of computer hardware and software, which help them in eliminating barriers of disability and using a computer.
Computer Devices for People with Disabilities
With the advent of these devices, now it is possible for people with disabilities to use the various machines, including the computer. One such device is the 'Tongue Drive System', wherein a small magnet is implanted in the users tongue and the user has to move his tongue in order to move the cursor. Unlike the other parts of the body, which are controlled by brain through the spinal cord, tongue is directly connected to the brain by a cranial nerve. The cursor can also be guided by off-the-shelf trackballs and foot pedals instead of computer mouse. Pointing devices which can be controlled by movement of the eyebrows are also popular among people with disabilities. Among the other devices for the physically handicapped, a popular one is the virtual keyboard that can be activated with various ability switches. The ability switches use two techniques to operate the keyboard - scanning and direct selection. Some of these keyboards anticipate the words that are being typed, while some even go further to anticipate the entire phrase, thus making it convenient for people to use a computer. The most useful program is the voice recognition program, wherein the human voice is used to generate equivalent key strokes. This program is designed in such a way that it works only for one individual, whose voice is keyed to the program.
Computer Devices for the Blind
Even blind and visually impaired people have benefited from technology boom. On one hand, tactile keyboards with oversize characters help people who are visually impaired to type without difficulty, while text-to-speech technology helps them minimize the errors by knowing what is being typed. Screen readers, powered with a sound card to provide synthesized speech output of the matter displayed on the screen, is one of the best examples of effective electronic devices for the blind.
Advanced technology has made sure that the future for people with disabilities is promising. Computer devices for the physically challenged have helped them learn new skills and thus become independent. Having access to vast amount of information, including information related to various disabilities, stored on the millions of web pages is a boon in itself. In short, computer devices for people with disabilities have not just helped them to enter the mainstream, but also proved them with a bit of help, they can be as competitive as anyone of us.
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Different Types of Computers
Computers have revolutionized all types of industries. They have proved to be a boon to mankind. What are the different types of computers? To know about them, read on.
A computer is one of the most brilliant inventions of mankind. Thanks to computer technology, we have been able to achieve storage and processing of huge amounts of data. We can rest our brains by employing computer memory capacities for information storage. Owing to computers, we have been able to achieve higher processing speeds, carry out critical transactions and that too with great precision and accuracy.
Computers of the earlier times were of the size of a large room and required to consume huge amounts of electric power. However, with the advancing technology, computers have shrunk to the size of a small watch. Depending on their processing powers, size and area of use, they have been classified into various types. Here's more on the different types of computers.
Basis of Classification
Operational PrincipleSize and Processing PowerUse
Based On Operational Principle
Analog Computer (Slide Rule)
Digital Computer
Operational Principle
1. ANALOG
2. DIGITAL
3. HYBRID
✦ Analog Computers: These are almost extinct today. These are different from a digital computer because an analog computer can perform several mathematical operations simultaneously. It uses continuous variables for mathematical operations and utilizes mechanical or electrical energy.
✦ Digital Computers: They use digital circuits and are designed to operate on two states, namely bits 0 and 1. They are analogous to states ON and OFF. Data on these computers is represented as a series of 0s and 1s. Digital computers are suitable for complex computation and have higher processing speeds. They are programmable. Digital computers are either general purpose computers or special purpose ones. General purpose computers, as their name suggests, are designed for specific types of data processing while general purpose computers are meant for general use.
✦ Hybrid Computers: These computers are a combination of both digital and analog computers. In this type of computers, the digital segments perform process control by conversion of analog signals to digital ones.
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Based On Size and Processing Power
Mainframe Computer
Microcomputer
Size and Processing Power
1. MAINFRAME
2. MICROCOMPUTERS
✦ Mainframe Computers: Large organizations use mainframes for highly critical applications such as bulk data processing and ERP. Most of the mainframe computers have capacities to host multiple operating systems and operate as a number of virtual machines. They can substitute for several small servers.
✦ Microcomputers: A computer with a microprocessor and its central processing unit is known as a microcomputer. They do not occupy space as much as mainframes do. When supplemented with a keyboard and a mouse, microcomputers can be called personal computers. A monitor, a keyboard and other similar input-output devices, computer memory in the form of RAM and a power supply unit come packaged in a microcomputer. These computers can fit on desks or tables and prove to be the best choice for single-user tasks.
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Based on Use
Desktop Computer
Laptop
Netbook
PDA
Server
Supercomputer
Wearable Computer
Tablet
Use
1. DESKTOP
2. LAPTOP
3. NETBOOK
4. PDA
5. MINICOMPUTER
6. SERVER
7. SUPERCOMPUTER
8. WEARABLE COMPUTER
9. TABLET
✦ Desktops: A desktop is intended to be used on a single location. The spare parts of a desktop computer are readily available at relatively lower costs. Power consumption is not as critical as that in laptops. Desktops are widely popular for daily use in the workplace and households.
✦ Laptops: Similar in operation to desktops, laptop computers are miniaturized and optimized for mobile use. Laptops run on a single battery or an external adapter that charges the computer batteries. They are enabled with an inbuilt keyboard, touch pad acting as a mouse and a liquid crystal display. Their portability and capacity to operate on battery power have proven to be of great help to mobile users.
✦ Netbooks: They fall in the category of laptops, but are inexpensive and relatively smaller in size. They had a smaller feature set and lesser capacities in comparison to regular laptops, at the time they came into the market. But with passing time, netbooks too began featuring almost everything that notebooks had. By the end of 2008, netbooks had begun to overtake notebooks in terms of market share and sales.
✦ Personal Digital Assistants (PDAs): It is a handheld computer and popularly known as a palmtop. It has a touch screen and a memory card for storage of data. PDAs can also be used as portable audio players, web browsers and smartphones. Most of them can access the Internet by means of Bluetooth or Wi-Fi communication.
✦ Minicomputers: In terms of size and processing capacity, minicomputers lie in between mainframes and microcomputers. Minicomputers are also called mid-range systems or workstations. The term began to be popularly used in the 1960s to refer to relatively smaller third generation computers. They took up the space that would be needed for a refrigerator or two and used transistor and core memory technologies. The 12-bit PDP-8 minicomputer of the Digital Equipment Corporation was the first successful minicomputer.
✦ Servers: They are computers designed to provide services to client machines in a computer network. They have larger storage capacities and powerful processors. Running on them are programs that serve client requests and allocate resources like memory and time to client machines. Usually they are very large in size, as they have large processors and many hard drives. They are designed to be fail-safe and resistant to crash.
✦ Supercomputers: The highly calculation-intensive tasks can be effectively performed by means of supercomputers. Quantum physics, mechanics, weather forecasting, molecular theory are best studied by means of supercomputers. Their ability of parallel processing and their well-designed memory hierarchy give the supercomputers, large transaction processing powers.
✦ Wearable Computers: A record-setting step in the evolution of computers was the creation of wearable computers. These computers can be worn on the body and are often used in the study of behavior modeling and human health. Military and health professionals have incorporated wearable computers into their daily routine, as a part of such studies. When the users' hands and sensory organs are engaged in other activities, wearable computers are of great help in tracking human actions. Wearable computers do not have to be turned on and off and remain in operation without user intervention.
✦ Tablet Computers: Tablets are mobile computers that are very handy to use. They use the touch screen technology. Tablets come with an onscreen keyboard or use a stylus or a digital pen. Apple's iPad redefined the class of tablet computers.
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What is Processor Cache
Processor cache is a piece of memory which allows a very high access rate and speeds up computation. It stores the data items that are frequently required by the processor, so that every time there is a demand for that data, the processor does not have to access the main memory.
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Main memory is a computer device with the slowest access rate. If the CPU needs a data item, a request is sent to the main memory via a memory bus. The main memory then searches for the data item and sends it back to the CPU. Lot of time is wasted in this entire cycle. What if the data item were stored somewhere close to the CPU? The working of processor cache is based on a similar concept. To understand the concept of cache memory, we will take an example of a library throughout this article.
Suppose, we have a library, with a single librarian. If a person comes and asks for Harry Potter Part I, then the librarian goes to the bookshelf and retrieves the book and gives it to the person. When the person is done with the book, it is restored to the shelf. If, any other person comes and asks for the same book, the cycle is repeated again. This is exactly how a system works without a cache memory.
Why do we need processor cache?
Now, let's see what happens in the presence of a cache memory. In our library example, let's consider a drawer at the librarian's desk as a cache. The procedure remains the same, when the first person places a request for a book. But, when the book is returned, the librarian does not store it on the shelf, instead keeps it in her drawer. Now, when the next person comes and places a request for the same book, the librarian simply has to retrieve it from her drawer. In a similar way, cache memory stores the data items that are frequently required by the processor. Thus, every time, the data is requested, processor simply looks in the cache and retrieves it, saving a long trip to the main memory. This tremendously increases the processor speed.
Does cache memory store only the frequently used data items?
No, cache memory is a smart piece of memory that also looks for the data that is likely to be requested in the near future. Continuing with our library example; when the person requests for Harry Potter Part I, our intelligent librarian also fetches Harry Potter Part II along with it. Now, when the person is done with the first book, it is very likely that he might ask for the second part. And when he does, librarian has it ready in her drawer. Similarly, when the cache memory fetches data items from the main memory, it also fetches the items that are located at the addresses near the requested items. These adjacently located chunks of data which are transferred to the cache is called the cache line.
Two-level processor cache
Most hard drives and other components make use of a single-level cache. But a processor cache is a two-level cache, in which level 1 cache (L1) is smaller and faster; while level 2 cache (L2) is slightly slower, but anytime faster than the main memory. L1 cache is divided into two parts viz., instruction cache and data cache. Instruction cache stores the set of instructions that are required by the CPU for computing; while the data cache stores the values that are required for current execution. L2 cache is responsible for loading the data from the main memory. Again, coming back to our library example, consider a librarian's drawer as L1 cache. On any busy day, when the demand for books is high and the librarian has already stored many books in her drawer, chances are that it might get full pretty quickly. This is where L2 cache comes into the picture. Consider a bookcase near the librarian's desk as L2 cache. When the drawer fills up, the librarian starts storing the books in the bookcase. Now, whenever there is a demand for some popular book, the librarian first looks in her drawer; if the book is not found there, she searches it in the bookcase. Similarly, when L1 cache is full, data is stored in L2 cache. The processor first looks for the data in L1 cache, and if it is not found, then only L2 is searched. If the data is not found in L2 as well, a trip to main memory is inevitable.
Is implementing more cache a good idea?
Yes and No. Implementing more cache will let you fetch data quickly, only in the cases, when the data is available in either L1 or L2. Coming back to our library example. If a person requests a popular book, which is not stored in the librarian's drawer or the bookcase; she first looks for it in the drawer and then in the bookcase. This way, lot of time is wasted before she finally retrieves it from the bookshelf. Similarly, the processor checks first in L1 and then, in L2, and when the item is not found in either cache, then only sends a request to the main memory. As you must have realized, lot of processor time is wasted, in looking for the item in the two cache memories. When the processor finds the required data item in any of the cache memories, 'cache hit' is said to have occurred; on other occasions, a 'cache miss' takes place. Data items are periodically updated and replaced using various algorithms to maximize the instances of cache hit.
One might think that if cache memory is so fast, why not implement it large enough so as to store entire data of the main memory in it? The reason, is that, although cache memory offers fast access, the speed comes at a great expense. Hence, proper utilization of the available cache memory is must.
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Best Computer Brand
When it comes to computers, everybody opts for the best brand that is available in the market. Here is a brief elaboration of the best computer brands that can be found in the market.
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There are several computer manufacturers and brands that provide you with a range of hardware, desktops and workstations and even laptops. However, a major hurdle is choosing the right brand, as there are countless companies, that have many tempting offers for computers, laptops and desktops alike.
Best Computer Brands List
The following list is a compilation of brands that have gained a good level of reputation in the market. The sales, products, goodwill and popularity of such brands say it all. Take a look.
1. Dell
Another name that is known for efficiency is Dell. The company was started to make successful computers and that is exactly what it is successfully doing today. Michel Dell indeed has seen dreams turn to reality, as today Dell is one of the biggest producers of Laptops and Notebook computers, not to mention the enormous line of desktops. The basic motive of Dell is to make computers for every person and every place. Dell manufactures computers and laptops for students, consumers, businessmen and corporates. It makes computers for homes, schools, offices and even public places.
Merits Current Notable Products*
Huge product range
Excellent products or all purposes and prices
Giant RAMs and storage hard-disks
Inspiron 15R
Vostro 460 Mini Tower
Vostro 3555
OptiPlex 990 Premier Desktop
2. Hewlett-Packard (HP)
HP is often known to be a prominent supplier of desktops and laptops to corporate clients. The company is also preferred by a large number of people, since it is also a manufacturer of office utilities, such as photocopying machines and scanners. HP has launched a huge series of desktops as well as laptops. Some really innovative products that have been launched by HP include, HP TouchSmart a touch screen computer and the famous HP Brio. If you are planning to go in for a desktop, then this is the best brand for desktop computers that you can avail.
Merits Current Notable Products*
Conservative energy consumption
Good colors and screen features
Sturdy and reliable
Has the 'business look'
Excellent range of peripherals
HP Pavilion g6s customizable Notebook PC
HP Pavilion dv6t Select Edition customizable Notebook PC
HP TouchSmart 420t customizable Desktop PC
HP Omni 220xt customizable Desktop PC
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3. Apple
The brand of Steve Jobs and the brand that maintains quality. Apple computers are known for their quality control, research and development and also their willingness to maintain a specific procedure of manufacture. Apple has successfully launched a wide range of computers that includes both laptops and desktops. The best brand for laptops on the market is of course Apple, due to its wide range of laptops that includes, MacBook, iMac and Mac Mini. A remarkable desktop computer that was released by Apple is the Mac Pro. Apart from the quality, speed and smooth running, Apple also caters to the style quotient. For personal use, this brand is the best laptop brand.
Merits Current Notable Products*
Fantastic apps and additional
Classic and elegant look
Convenient size
Sophisticated programing and technology
Very user-friendly
Sturdy hardware
Better hardware-software package
Classy Peripherals and add-ons
MacBook Air
Mac mini
iMac
Mac Pro
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4. Lenovo
Lenovo, which had been previously known as 'Legend', is a Chinese computers company which caters to all possible segments of the computer markets. International Business Machines (IBM) on the other hand is a giant that churns out computers for every possible person on the face of this earth. In 2005, Lenovo acquired the computers division of IBM. Lenovo is maintaining almost the entire staff of IBM in North Carolina in addition to an executive headquarters in Purchase, New York. In addition to that Lenovo will also be able to use the IBM brand name and own the famous 'Think' marquee/brand name for 5 years.
The product directory of both these companies is so big, that you will have computers working at every possible speed in it. The basic memorandum of the company is to supply computers to every working person. You will find countless companies using both the IBM and Lenovo brands. Essentially both brands put together, make the world's third largest computer business.
Merits Current Notable Products*
Huge product range (both PCs and Laptops)
A well established product range
Sturdy designs and good peripherals
Caters to all purposes
Highly competitive prices
Good business oriented computers
ThinkPad Edge E525
ThinkPad T520
IdeaPad S205
Essential G770
ThinkStation C20
ThinkStation E30
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5. Gateway
An Acer subsidiary, Gateway is a manufacturer of brilliant computers. The principle operations of the company include Netbooks, Notebooks, Desktops and LCD displays. Like Apple, this company is admired for its precision, research and development. Gateway computers can be used by both corporates and consumers.
Merits Current Notable Products*
Elegant looks
Economical and competitive pricing
Space effective, easy to carry
Good battery
Selected yet highly stylish range of models
(only netbooks and notebooks)
LT2304l
LT2305l
NV55C17I
NV55C16I
(*note: It must be taken into note that the models which have been included in the tables, are the current models, they are constituents of other larger "series", "families" and "marquees". It must also be taken into account that the aforementioned are individual models.)
Just look for the features that you need and want, you are sure to get the appropriate device or model from major brands.
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