Sunday, December 5, 2010

OS: Case Study 3

In a multiprogramming and time-sharing environment, several users share the system simultaneously. This situation can result in various security problems. Name at least two of these problems. Can we ensure the same degree of security in a time-share machine as we have in a dedicated machine? Explain your answer

A multiprogramming is a method of simultaneous execution on a digital computer of several programs related to different problems. Multiprogramming system is that system in which multiple programs run at same time or simultaneously for example windows xp.in this system does not provide user interaction with the computer system. But time sharing systems that provide user interaction with system and user thinks that system is with him all the time.

Some problems are: Data confidentiality having secret or confidential data remains so defining and enforcing who can see what – authorization authentication. Stealing or copying one's programs or data; using system resources (CPU, memory, disk space, peripherals) without proper accounting. Unauthorized user or program cannot modify data without owner’s permission. Writing over another program's (belonging to another user or to the OS) area in memory. Using system resources (CPU, disk space) without proper accounting; Causing the printer to mix output by sending data while some other user's file is printing.


The more complex the scheme, the more difficult it is to feel confident of its correct implementation. Security depends on the key strength number of keys type of algorithm key distribution system reliability of persons and other such parameters in cryptology hence time sharing or dedicated machines.

The time-sharing mode gives every user the impression that the computer is working for him alone. Each user is supplied with a data input-output device (of the display type) or other equipment that ensures interaction with the computer. This includes equipment that uses telephone lines. Each user solves his problem periodically during the machine time allocated to him, studies the results, and prepares the next assignment for the computer. The user ordinarily uses a general library of programs, but he may also have a private archive. If the general library is used, a supervisory program plans and executes forced interruptions of programs depending on user priority, machine time allocated to him, and the nature of the problem being solved. The time-sharing mode permits the user to carry on an effective dialogue with the machine, which is most convenient in control systems for production processes, automatic control systems for enterprises and sectors of the national economy, reference and information services, and large computer centers. When it is not serving users, the computer may do batch processing.
Multiprogramming is provided by hardware and software. The hardware includes memory protection and the organization of interruptions. The software includes supervisory programs and problem-oriented programming languages that take into account the characteristics of multiprogramming.

OS: Case Study 2

Select two of the following professionals:

Put forward a theory about how that person might use a hand held computer in their work

• A newspaper reporter

The work of the reporter is to gather all the information needed in a certain type of mass media. They have different ways in collecting data. A newspaper reporter gather and analyze facts about current events that is happening in a certain events, and they observes, investigates or interview to get information. They take notes or use a tape recorder while covering a story. Reporters work both indoors and outdoors, dealing with all kinds of people. They may work for long periods on unproductive leads. With the help of computers, they can check references thru internet, and even they are not in the office they can use portable computers outdoor. Sometimes, to meet deadlines, reporters deliver their news story over the telephone or use portable computers to enter the story which is then sent by modem directly to the newspaper's computer system. In my research, I found out that electronic technology has brought change to the newspaper office; it has not diminished the need for reporters. Automation has eliminated the legendary clamor of the large news room in favor of a more high-tech information producing operation.


• A Manager in a Supermarket

A manager is the one who manage a team. They are the one who supervise employees and store operations, also in inventory and ordering products. A supermarket manager should communicate with the employees. Computer is a big help in this kind of industry. Information systems are used widely in shops and in the distribution of goods and one area in which their use is particularly important is a supermarket. Computer systems are used in a variety of ways in the modern. The supermarket uses several computers. The internet is a huge help to people relocating, giving them a visual aid of what is available in the supermarket. Much communication can be done prior to a prospect arriving in a new town.

Techno2: Assignment 3

your reflections/learning's/thoughts on the video clip of Guy Kawasaki: MAKE Meaning (at least 2000 words)


We watched a video clip of Guy Kawasaki. Who is Guy Kawasaki? He is one of the founders and Managing Director of Garage Technology Ventures, a seed-stage and early-stage venture capital fund. Lots of learning that we can get here in his video; the art of the beginning. He suggested some tips and guidelines in order to be successful in life and how to balance life. He gives examples of the best way to make meaning: increase quality of life, right a wrong, and prevent the end of something good. Increase quality of life is the best example of make meaning. It can motivate your self or your goal in life. If you make meaning in your life, you increase the quality of your life. It can help you to go on in your life. Next is right a wrong. In that quote, we should to good deeds in order to make our life better. If we want people will treat us good, we should start that in our own. To right a wring is a good way in make meaning of our life. Just follow your heart if you know that's the right thing to do. The last one is prevent the end of something good. All bad things and good things happen for a reason. Whatever the outcome of your plans just be ready and accept it.

He also explains that market research, focus groups, and test cases can bog down an entrepreneur and prevent her or him from completing the most necessary task - action! His advice to break the cycle is to think different, polarize people, and find a few soul mates. He also suggested to create a milestone to keep the business in a right path in order to be successful. All of the experience in the world means nothing if they are not bitten and infected by the start-up bug. He also tells you how to avoid the bozo explosion, which only leads to layoffs, and how to apply the shopping center test to know if you're hiring the right person. There are so many ways on how to be successful in life: Set targets or goals - Always set realistic targets and give yourself a date by which to reach your target. Review your targets on a regular basis to make sure they are always attainable. Study hard. Tap your resources. Have a positive mental attitude .Negative thoughts that have been inculcated in our conscious and unconscious minds are among the major hindrances in our lives. Manage your time right. Learn to give and share to others. Success cannot be achieved by just your own efforts. There are also people around you who have contributed and paved the way for you to succeed, so you have to be thankful for that. Mistakes are an inevitable part of business life, particularly so for start ups. Errors can serve as learning tools, but can also sap your enthusiasm and drive. Mistake is a challenge.


He says that: “if you make meaning, you will probably make money. But if you set out to make money, you will probably not make meaning and you won’t make money.” In this quotes, he wants to imply in business, making meaning is also make money. Making money in business is one of the most important factors. All of the business man should come up with a big money in order to be successful. If you really dedicated in your life, you will be successful. You have to put your heart in this kind of activity. Make meaning is not just also to make money but to increase the quality of life, right a wrong, prevent the end of something good and to make a better place. You have to set your goal in life. What do you want or what you like. Setting goals to your self is an essential element of being a human. To be effective, goals must be clear and understandable. Each goal must be concrete, attainable, and critical to the growth of your business. Don't set goals such as "Do a better job," because a general goal does not instruct.


In order to be successful in life you have to balance everything. Do the right thing in the right way and help people in a right way without any hesitation. Kawasaki said that too much money is worse that not enough money. He believes that if you are having a hard time finding someone to spread the message about your product, then you may need to re-evaluate your product or your goals. Build something great, and the evangelists will be there. Every business requires a different set of skills or know-how, knowing general principles of doing business can go a long way to ensuring the long term. There are many tips to be successful in life: Work with your passion - do something that you love. When you’re in a business that gives you personal satisfaction, then you’ll do anything to make it succeed. You have to know what you love, what you like and what you hate. Believe that you will be successful - when you have a winner’s mindset, then you’ll be motivated to work hard, persist and focus and don't be afraid. To have mistake is a challenge for us. You have to ready always because not all the time we are the winners. Train to be a better entrepreneur - For most people; a home-based business is the starting point of their journey towards a life of entrepreneurship. And the only way to reach success is to constantly invest in yourself and make your entrepreneurial spirit grow. Planning is an often overlooked aspect of starting a business, a fatal mistake that often shows up in midstream. Mistakes are an inevitable part of business life, particularly so for start ups. Errors can serve as learning tools, but can also sap your enthusiasm and drive. Passion can only take you so far, and when the mistakes pile up, a man without a plan could be in serious trouble. Creating and sticking to a plan is more important for start up businesses, as these often have limited resources. Jacinto says businesses often make the mistake of splurging on only one aspect of the business, to the detriment of other factors.

Make meaning in your life is a big help for us to go on with our life. You have to know what you really love, what you like and what you hate. In order to be successful in life, you should be focus in everything and balance. As I watched the video again, it really inspired me again to enjoy life and to think business that is good and can help to everyone