computer in business.

8/11/2019 computer in business.

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Input Devices


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Group D

2ndyear 2ndsemester

Session 2011-2012

Department of Management studies

Begum Rokeya university, Rangpur

Prepared by


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Mst. Nishrat ZamanLecturer

Department of Management studies

Begum Rokeya University, Rangpur

Prepared to


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Id no Name

1105025 Md. Manjurul Alam

1105026 Md. Mehedi Hasan

1105027 Mohammad Meher Ali

1105029 Md. Nazmul Huda

1105031 Obaidul Haque

1105033 Md. Rajib Hossain

1105036 Rejaul Haque

1105039 Rubaiya Ferdous

Group: D


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Date: 23th April, 2014.

To,

Mst. Nishrat Zaman

Lecturer

Department of Management Studies

Begum Rokeya University, Rangpur.

Sub: Request for presenting Assignment on Marine Insurance.

Madam,

We beg most respectfully state that, we have successfully completed our Assignment that you have assigned us tocomplete.

We, therefore, request that, you would be kind enough to grant our term paper and oblige us thereby.

We remain madam,

Members of GROUP:D

LETTER OF TANSMITTAL


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At first, we want to deliver our best gratitude tothe Almighty Allah. Then, we thank to ourhonorable course teacher Mst. Nishrat Zamanfor helping and guiding us through teaching and

providing information about this assignment andpresentation. We also thank to the groupmember to provide us information.

Acknowledgement


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In computing, an input device is any peripheral (piece of computerhardware equipment) used to provide data and control signals to

an information processing system such as a computer or otherinformation appliance. Input devices are electromechanicaldevices that are used to provide data to a computer for storingand further processing, if necessary. They act an interfacebetween the computer and the use. The basic task of an input

device is to take the input from the user, translate it into themachine readable form and then present it to the processingunite devices provide for execution. In fact, the input devicesprovide a means of communication between the computer and

the outer world.

Introduction


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Keyboard is the most commonly used input devices. We can use akeyboard to type data and text and execute commands.

Special purpose keys

Function keys

Central keys

Numeric keypad

Alphanumeric keys

Keyboard


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Pointing devices are the input devices that are generally used for moving the cursorto a particular location to point an object on the screen. With the help ofpointing devices, we can easily select the icons, menus, windows etc. on the

graphical User Interface (GUI).

Some of the commonly used pointing devices are:

Mouse

Trackball

Light pen

Joystick

Touch screen

Pointing devices


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Mouse is a small hand-held pointing device that basically controls thetwo-dimensional movement of the cursor on the displayed screen.

Mouse are generally two types:

Mechanical mouse

Optical mouse

Mouse


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A mechanical mouse consists of three buttons: left button, rightbutton and scroll button. Inside the plastic coating of the mouse,there is a ball, which is rolled over a flat surface corresponding to

which the cursor moves on the display screen.

Mechanical mouse


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An optical mouse is a pointing input device in which the reflectedlight determines the movement of the cursor on the displayedscreen. The upper portion of the optical mouse is similar to that of

the mechanical mouse. The lower portion of the optical mouseconsists of having light.

Optical mouse


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Trackball is a pointing device that basically consists of a socketcontaining the ball, which can be rolled manually to move thecursor on the screen. The socket also contains sensors, which

detect the movement of the ball.

Trackball


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Light pen is an electro-optical pointing device that is used forselecting the objects on the display screen with the help of a lightsensitive pen. It is generally connected to the Visual Display Unit(VDU) of the computer system. Using a light pen, we can directlydraw the objects on the screen by holding it in our hand.

Light Pen


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Joystick is a pointing device that usually consists of one or morebuttons and a stick, which controls the movement of the cursoron the screen by pointing in all directions. It continues to point ina particular, direction until and unless it is brought back to thevertical position.

Joystick:


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Touch screen is a pointing device that enables us to enter data suchas text, pictures and images by directly touching the screen. Thetouch screen is the display monitor with which the user can directlyinteract with the computer system by touching the screen.

Touch screen


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Scanning devices are the input devices that canelectronically capture text and images, and convert them

into computer readable form. The basic task of a scanningdevice is to convert an image or the textual data intodigital data, i.e., in the form of boxes, where each boxrepresents either zero or one. The resultant matrix is

known as bit map and is displayed on the screen.

SCANNING DEVICES:


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Hand-held scanners are the scanning devices that are generallyused for digitizing the images into bit map, which is a matrix of O's

and l's. The size of these scanners is small and the price is relativelyless as compared to the other three types of scanners.

Hand-held Scanners


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Flatbed scanners consist of a flat surface composing o glass paneon which the documents are kept for scanning. Under this glasspane, there is xenon light and a CCD, which consists of an array ofred, green and blue filters.

Flatbed Scanners


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Drum scanners generally consist of a large drum, which is used forscanning the documents. These scanners make use of the PhotoMultiplier Tubes (PMT) technology, instead of the CCD technology.

Drum Scanners:


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Slide scanners are used for scanning slides as well as film negatives.The slides are created on a transparent base using photochemicalsolution. The film negatives are the inversion of the positive

images.

Slide Scanners:


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Optical recognition devices are used for recognizing thecharacters optically. The optical recognition devices

basically make use of optical scanner for inputting data.Unlike keyboards, the optical recognition devices do notenter the data by pressing the keys. Therefore, thesedevices help the user in saving a lot of time as entering

data through a keyboard is a time consuming task. Thefollowing are some of the commonly used opticalrecognition devices.

OPTICAL RECOGNITION DEVICES:


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Optical Character Recognition (OCR) devices scan a particulardocument by recognizing its individual characters and convertingit into the editable form. These devices distinguish the dark areaon the document from the light areas for recognizing thecharacters.

OCR Devices


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The Optical Mark Recognition (O devices make use of OMRtechnology, which helps marked in obtaining the data from themake fields. These devices prove to be of great use in recognizingcharacters in question sheets, enrolment forms, registration forms,employee payroll, etc.

OMR Devices:


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Magnetic Ink Character Recognition (MICR) devices are the specialdevices used for recognizing the characters written with magneticink consisting of iron oxide particles. These devices were specially

developed for the banking operations.

MICR Devices


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Bar code reader is the scanner that usually reads bar code, which isused to label the items in the super markets, retail stores, booksnumbering in library, etc. The bar code is the computer readable

code representing vertical lines of different widths.

Bar Code Reader


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A digital camera is a handheld electronic device that is used tocapture the image of an object electronically. The digital camera

consists of a built-in computer, which helps in recording the imageselectronically. Whenever a user initiates the process of capturing animage by pressing the button available on the camera.

DIGITAL CAMERA


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The input devices, which are generally used in media forcommunicating with the mass audiences, are known as media input

devices. The following are the most popularly used media inputdevices:

Microphone

Graphics tablet

Webcam

MEDIA INPUT DEVICES


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It is an input device that basically converts the sound waves intoelectrical signals with the help of sensors. The sound wave pattern

is converted into the electrical pattern.

Microphone


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It is an input device that is usually attached to the user's computerfor recording videos as well as images. It functions like a video

camera and can be used for displaying the images over theInternet.

Webcam


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It is a media input device with the help of which a user can enterpictorial information into the computer system. The graphics tabletis a combination of a digitizing pen and an electronic tablet.

Graphics tablet


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Bangladesh Computer Samity (BCS) is the apex ICT business andtrade industry association of Bangladesh. It represents the industrythat comprises of distributors, dealers, resellers of computer andallied products, locally assembled computer vendors, softwaredevelopers and exporters, internet service providers, ICT basededucational institutions and training houses and other ICT enabledservices providers. Established in 1987 with 11 founding members,the total number of members stands 1257 at present. The body is

run by a 7-number executive committee elected every two years.

Bangladesh Computer Samity (BCS)


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* To unite and encourage all computer vendors to join in one platform forachieving their common interest

* To unit and encourage cooperation amongst companies, firms and industries

* To seek cooperation among all the members in the ICT business

* To safeguard the interest of its members and their development

* To boost/encourage, promote and diversify effective use of Computer inBangladesh

* To render expert advice to the concerned authorities on computer technologyand its implication of the economy of Bangladesh

* To make representation to the Government and related bodies on behalf ofBCS members with a view to reduce bottlenecks, grievances, anomalies andmeeting legitimate demands

Aims and Objectives ofBangladesh Computer Samity


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Input devices are the hardware devices that help in inputting thedata from any outside source, into, the computer system. There arevarious input devices, with the help of which a user can enter

different types of data into the computer system. Keyboard is oneof the most widely used input devices for providing alphanumericinformation to the computer. A user simply presses these buttonsfor entering the data into the,computer system. The user can also'input data into a computer system with the help of pointingdevices such as mouse, trackball; light pen joystick and touchscreen. The user can easily select the objects, menus and iconsavailable on the screen using a pointing device.

Summary


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computer in business.

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