Operating System Fundamental

An operating system is a program that acts as an intermediary between a user of 

a computer and  the computer hardware. The purpose of an operating system  is 

to provide an environment in which a user can execute program. 

An  operating  system  is  an  important  part  of  almost  every  computer  system. A 

computer system can be divided roughly into four components: the hardware, the 

operating system, the applications programs, and the users) 

The hardware ñ the central processing   unit (CPU), the memory, and the input / 

output  (I/O) devices  - provides  the basic computing  resources. The applications 

programs  ñ  such  as  compilers,  database  systems,  games,  and  business 

programs  ñ  define  the  ways  in  which  these  resources  are  used  to  solve  the 

computing problems of the users.  

Database Topic for IT Officer

Data Models, Schemas and Instances

A characteristic of the database approach is that it provides a level of data abstraction, by hiding details of data storage that are not needed by most users.

A data model is a collection of concepts that can be used to describe the structure of a database.  The model provides the necessary means to achieve the abstraction.

The structure of a database is characterized by data types, relationships, and constraints that hold for the data.  Models also include a set of operations for specifying retrievals and updates.

Data models are changing to include concepts to specify the behaviour of the database application.  This allows designers to specify a set of user defined operations that are allowed.

Categories of Data Models

Data models can be categorized in multiple ways.

• High level/conceptual data models – provide concepts close to the way users perceive the data.
• Physical data models – provide concepts that describe the details of how data is stored in the computer.  These concepts are generally meant for the specialist, and not the end user.
• Representational data models – provide concepts that may be understood by the end user but not far removed from the way data is organized.

Conceptual data models use concepts such as entities, attributes and relationships.

• Entity – represents a real world object or concept
• Attribute - represents property of interest that describes an entity, such as name or salary.
• Relationships – among two or more entities, represents an association among two or more entities.

Madhya Pradesh Power Generating Company Limited (MPPGENCO).

Application are invited for the Posts of Executive Trainees in Madhya Pradesh Power Generating Company Limited (MPPGENCO).

1-Post Name : Executive Trainees

• Qualifications : Candidates who have already passed the final semester / Year examination need only apply. The candidate should possess a regular full time Engineering degree (BE/B.Tech) in Computer Science Engineering or Information Technology from a recognized University / institution (recognized by UGC / AICTE) with : (i) Minimum 65% aggregate marks in case of Unreserved / OBC candidates. (ii) Minimum Passing marks in case of SC/ST/PD candidates and for the Candidates belonging to the project affected families as rehabilitated consequent to land acquisition in Shri Singaji TPP Khandwa.

Power Grid Corporation of India Limited Recruitment

Application are invited for the Posts of Field Engineer, Field Supervisor in Power Grid Corporation of India Limited.

1-Post Name : Field Engineer

• Qualifications : ME/M Tech, Ph d.B.E/ B.Tech/ B.SC(Engg)/ AMIE in Electronics & Communication Engineering discipline from recognized University/ Institute with minimum 55% marks
• No. Of Post : 52 Posts.
• Age Limit : 35 Years.
• Pay Scale : Rs.30000/-

IT Associate in Bihar

 Application are invited for the Posts of Project Associate, IT Associate in Bihar Rural Livelihoods Promotion Society.

1-Post Name : Project Associate

• Qualifications : PG degree/diploma in Rural Management/Rural Development/Social Work/agri-business management/agriculture and allied from recognized institute/university. (Fresher can apply). or Post graduate in any discipline from recognized institutes/university with minimum 1 years of post qualification relevant experience. Or Graduate in any discipline from recognized institutes/university with minimum 3 years of post qualification relevant experience. S/he should have experience of working in development project or government development programme in the areas of documentation, communication, reporting, data entry, file management, facilitating event organization & business dealing with different agencies. Typing skill in Hindi & English would be desirable.

Indian Ordnance Factories

Application are invited for the Posts of Semi-Skilled in Indian Ordnance Factories (Gun Carriage Factory).

1-Post Name : Semi-Skilled

• Qualifications : Matriculation or its equivalent and National Council of Trades for Vocational Training (NCTVT) certificate [i.e. National Apprentice Certificate (NAC) or National Trade Certificate (NTC)] in the relevant trade failing which by I.T.I. or its equivalent Diploma /Certificate.
• No. Of Post : 220 Posts.
• Age Limit : 18-32 Years.
• Pay Scale : Rs.5200-20200/-

Consultant in National Centre for Cell Science (NCCS).

Application are invited for the Posts of Consultant in National Centre for Cell Science (NCCS).

1-Post Name : Consultant

• Qualifications : Candidate should possess minimum qualification of M.Sc in Microbiology/Zoology/Botany.
• Age Limit : 30 Years.
• Pay Scale : Rs.10000/-

Management Assistant in National Agri-Food Biotechnology Institute.

Application are invited for the Posts of Management Assistant in National Agri-Food Biotechnology Institute.

1-Post Name : Management Assistant

• Qualifications : Graduate degree in any discipline from a recognised Institute/University or equivalent. Desirable: MBA/PG Diploma in Material Management or Two years of relevant experience and Knowledge of Modern Management practices, Computer application / Management Information systems.
• No. Of Post : 01 Posts.
• Pay Scale : Rs.9300-34800/-

Banaras Hindu University, invites applications for the post of Data Entry Operator/

Banaras Hindu University, invites applications for the post of HIV Research Fellow/Data Entry Operator/Data Manager  www.freshersworld.com

Name of Post	Name of Project	Qualification	Salary
Data Entry Operator	Visceral Leishmaniasis in Bihar States,  India (P-36/10)	BCA or equivalent  Desirable: Speed and accuracy of data entry and  verification	Rs. 12,000/
HIV Research Fellow (Clinical)	National AIDS Control Organization (NACO) / UPSACS funded Centre of Excellence (Scheme No. 4080) for HIV Care	MD Medicine or any other clinical discipline/ Community Medicine /Microbiology/ Ph.D after M.B.B.S.Alternatively: MBBS with Diploma in Medical Specialties, Public Health or Fellowship program in HIV with 3 year experience. M.B.B.S.	Rs. 32000-40000/-

Canara Bank

Jobs Details :- Application are invited for the Posts of Manager Security, Agricultural Extension Officers in Canara Bank.

Posts Details :-

• Manager Security in MMGS-II Scale : 17 posts  .
• Agricultural Extension Officers in JMGS-I : 350 posts.

1-Post Name : Manager Security

• Qualifications : Graduation or any equivalent qualification.
• Experience :- An Officer with 5 years of commissioned service in Army / Navy / Air Force and not below the rank of Captain or equivalent or an Officer not below the rank of Asst. Commandant in Para Military Forces with 5 years experience.
• No. Of Post : 17 Posts.

University of Delhi Recruitment of Information Executives

University of Delhi invites application in the prescribed format for the following Post on Contract basis :

Name of the Post : Information Executive

No. of Posts : 04 Posts (UR – 03 ; ST – 01)

Remuneration : Rs.13,500/- p.m. Consolidated

Qualification : Graduate in any Discipline

Jobs in National Institute for Visually handicapped

Applications are invited from the eligible candidates for filling up the following posts :

Details of the Vacancies :

1. Sr. Research Officer (Technical) – 01 Post UR

Pay Scale : Rs. 15600-39100 + GP 6600

2. Lecturer-cum-Course Coordinator (Orientation & Mobility) – 01 Post SC

Pay Scale :Rs. 15,600-39,100 + Grade Pay 5400

3. Lecturer in Education – 01 Post OBC

Pay Scale : Rs. 15600-39100 + GP 5400

4. Research Assistant – 01 Post OBC

EDCIL Noida Recruitment 2013

EDCIL Noida Recruitment 2013: Educational Consultants India Limited (EDCIL) has announced a notification for recruitment of vacant seat of Telecom Assistant post. Candidates who want to apply for this post can send application form and documents on or before 11^thFebruary 2013. For further more details about EDCIL Noida Recruitment 2013are given below:

Name of Organization: Educational Consultants India Limited (EDCIL)

Name of Organization	Educational Consultants India Limited (EDCIL)
Post Name	Telecom Assistant
Age Limit	40 years as on 1st October 2012
Salary	Rs. 16,500/- per month
Last date of receipt of Application	11th February 2013

Wren and martin english grammar ebook

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