...regions • Mutual exclusion • The part of the program where the shared memory (or something else) is accessed is called a critical section • This is not enough (more rules): – Not two processes simultaneously in their critical regions – No assumptions may be made about speed and number of CPUs – No process running outside its critical region may block another process – No process should have to wait forever to enter its critical region OS 2007-08 6 OS 2007-08 5 1 Ideally A enters critical region A B blocked B enters critical region B attempts to enter critical region B leaves critical region A leaves critical region Many solutions… • Disabling interrupts • Locks • TSL instruction (hardware) • Semaphores • Mutexes • Monitors • Message passing •… 7 OS 2007-08 8 OS 2007-08 Disabling interrupts • Simplest solution • CPU switches from process to process only when an interrupt occurs (e.g. the clock interrupt) • This approach can be taken by the kernel • Should the OS trust the user in disabling/enabling interrupts? Too dangerous! OS 2007-08 9 Locks • A lock variable (alone it doesn’t work)...
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...CASE STUDY – Organizational Behavior, Week 2 NO RESPONSE FROM MONITOR TWENTY-THREE* Robert D. Joyce, Innovative Management Loudspeaker: IGNITION MINUS 45 MINUTES. Paul Keller tripped the sequence switches at control monitor 23 in accordance with the countdown instruction book just to his left. All hydraulic systems were functioning normally in the second stage of the spacecraft booster at checkpoint 1 minus 45. Keller automatically snapped his master control switch to GREEN and knew that his electronic impulse along with hundreds of others from similar consoles within the Cape Kennedy complex signaled continuation of the countdown. Free momentarily from data input, Keller leaned back in his chair, stretched his arms above his head, and then rubbed the back of his neck. The monitor lights on console 23 glowed routinely. It used to be an incredible challenge, fantastically interesting work at the very fringe of man’s knowledge about himself and his universe. Keller recalled his first day in Brevard County, Florida, with his wife and young daughter. How happy they were that day. Here was the future, the good life . . . forever. And Keller was going to be part of the fantastic, utopian future. Loudspeaker: IGNITION MINUS 35 MINUTES. Keller panicked! His mind had wandered momentarily, and he lost his place in the countdown instructions. Seconds later he found the correct place and tripped the proper sequence of switches for checkpoint 1 minus 35. No problem....
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...Currently Riordan Manufacturing has several different offices and each office is using a different type of system, but there is not a central system that monitors each of the satellite offices and their production. To assist Riordan become more efficient, they will need to implement a central system to monitor both individual and overlapping system usage. They should create a Data Center in the corporate office that monitors all of the current systems in place. This will allow Riordan Manufacturing to understand how their business is functioning and how application are used more often and which are not utilized enough, helping to determine if they should upgrade or discontinue the use of a system. Each department uses different applications; some of the applications interface with one another and other are stand alone. Riordan also currently has a lot of manual processes, for example how they submit daily inventory records. With the overall updates that our team has posed have more automation will assist Riordan to increase their production and accuracy. We can implement an application that can be used by all of the centers in order to maintain the inventory across the board so the managers are able to see what is in high demand in specific locations. Having an overall view of the inventory will be beneficial to the entire company. If the marketing department has he ability to see the inventory usage then they will know where they need to market certain products better. We...
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...Nicholas Richards 23/09/2015 Prin. of Man. Shark Tank paper BuggyBeds When viewing videos for this paper I saw some pretty great and just some not so great products. But one stood out to me from all the others. During the show for this product, two women presents the Sharks with a product called BuggyBeds. This product was presented as an early detector for bed bugs around the house. These monitors attract bed bugs to the trap and keep them trapped using a special formulated glue. As stated by both women pitching their product, the glue is not poisonous and is not harmful to people, which is a must if little kids are around. The monitors themselves are very small and easy to use. All one has to do is unpack the monitor and then place it around the area/furniture one thinks might contain bed bugs, preferable under the desired object. I found it interesting while watching this bit show when one of the women informed the Sharks that there really is not a lot of early detection systems for bed bugs. For them to produce a two-pack it just costs about ~ $1.60 – 1.75, and then they may market the product for about $6.99. I choose this product that will sell/win because of just how big a problem bed bugs are for a huge number of people and organizations. One fact stated by the women pitching this product is that a female bed bug can produce upwards to 500 more bed bugs. That is frightening, without anyway to deal with bed bugs they would just keep appearing. To me, I feel like...
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...BRIEF CASES HARVARD 'BUSINESS PUBLISHING 4440 APRIL 2 7 , 2 0 1 2 DOROTHY LEONARD SUNRU YONG Bella Healthcare India Joseph Cherian, country director of Bella Healthcare in India, wondered whether his team was ready for Project TKO. He listened intently as Jeremy Manning, his director of research and development, described the pros and cons of the project, a proposal to develop a new portable electrocardiograph machine (EKG) specifically for the Indian market. Cherian believed the time was right to tackle the tough, but fast-growing Indian market. The key question was whether Bella India's local R&D team, under Manning's direction, was ready to lead the product development: My goal has always been to develop products that serve emerging markets and make healthcare more accessible. I think medical device companies are learning that this can be done most effectively by those who know these markets best. We should develop our affordable EKG in India, for India. Bella India has proven itself in manufacturing and costengineering; this is the next logical step. The endeavor was not without risk. The costly failure of Project Baton, a global product development effort, was fresh on everyone's mind. Failure with Project TKO would not only hurt Bella Healthcare's overall profitability, it would undermine Cherian's case that the India operation was ready for more challenging product development undertakings. £ | ^E o^| f§§ l^ff 21 ® ggo >^ 8 | j> | ^ji f£ | %^ E 111 I- |...
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...Monitor Study Summary Issue All users have been provided with one 19” extended width monitor. The system provides the ability to view multiple documents at once (side by side) for comparison purposes, however this feature is not used very often because the screen size limits the display to only small fonts, the entire document is not visible all at once, and the dual display is too complicated to set-up. Additionally, the quality of the scan in many cases is not as clear as an original typed document (such as this document), requiring the font to be displayed larger than normal size in order for it to be legible. Tasks performed by our users require them to be constantly comparing documents. In order to compare documents, users usually switch back and forth between screens or print the documents. Our system does not provide the ability to simultaneously view a document while creating new forms, so users are required to switch back and forth. Currently, the our users are required to access several systems to obtain all of the necessary information, resulting in having several systems open simultaneously. Goal of Study The goal of the monitor study was to determine if an increase in the amount of screen surface would provide significant benefits such as improved efficiency, reduced print volume, increased accuracy, and reduced physical stress. If the increased screen space provided significant benefit, then the second goal of the study was to determine the best set-up...
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...An individual that is computer literate has many advantages in life. All high-paying jobs require its employee to be computer literate. This skill is a must in order to be successful in the workforce. Computers have become a part of our everyday lives. Life would be very difficult without them. I am very computer literate. Working on computers became a hobby of mines back in high school. Operating on one is not an easy task if one has no idea of what he or she is doing. I started out make many mistakes on computers before I became an expert at them. For example, my grandmother bought me a computer for Christmas and I was the happiest kid in the candy store. I immediately went to the games section and enjoyed them to the fullest. One day, I began to run low on disk space and decided to go into my system files and delete random files and folders that I thought were useless to the computer. Sure enough they were useless until my computer displayed symbols and signs where text should have been. It was as if my computer exhibited a different language but only through different shapes and signs. I was terrified that I had done this to my computer! My mom later called customer service to resolve the problem, but never again did I go into my system and delete random files unless I knew exactly what I was deleting! I’ve learned a lot from my mistakes on working with computers. I am now a pro in the field of computers. I’ve had clients in the past that I have worked...
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...------------------------------------------------- Mouse (computing) From Wikipedia, the free encyclopedia A computer mouse with the most common standard features: two buttons and a scroll wheel, which can also act as a third button. A mouse is a pointing device that functions by detecting two-dimensional motion relative to its supporting surface. Physically, a mouse consists of an object held under one of the user's hands, with one or more buttons. The mouse sometimes features other elements, such as "wheels", which allow the user to perform various system-dependent operations, or extra buttons or features that can add more control or dimensional input. The mouse's motion typically translates into the motion of a pointer on a display, which allows for fine control of a graphical user interface. ------------------------------------------------- Naming The earliest known publication of the term mouse as a pointing device is in Bill English's 1965 publication "Computer-Aided Display Control".[1] The online Oxford Dictionaries entry for mouse states the plural for the small rodent is mice, while the plural for the small computer connected device is either mice or mouses. However, in the usage section of the entry it states that the more common plural is mice, and that the first recorded use of the term in the plural is mice as well (though it cites a 1984 use of mice when there were actually several earlier ones).[2] The term mice was seen in print in "The Computer as a...
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...parts of cells. It hinders cells from dividing which gives rise to cells which does not have the ability to reproduce. The reason why the researchers have chosen this topic is to stress out the hazardous effects of computer radiation.Long-term exposure to radiation increases the risk of all forms of cancer, tumors, blood disorders, miscarriage, headaches, insomnia, anxiety, aging of the skin, skin burn, etc. Radiation exposure over time can cause skin burn, dry wrinkled skin and photo aging. This skin damage is identical to sun damage and causes the same health problems. Many electronic products that we use on a daily basis expose us to harmful radiation. A television, microwave oven, cellular phone and computer are examples of products that emit radiation. To preserve your health use electronic products carefully, in ways that shield your body from radiation. Computer radiation is most harmful to skin health because we sit directly in front of the computer for long periods of time with our face absorbing the radiation. Lessening this type of harmful radiation is important. Computer radiation can make you feel...
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...MEMORANDUM Date To: Monitor Company Directors From: Consultant Subject: Coordination of diversity efforts at Monitor Company BACKGROUND Recently you informed me that Monitor Company does not have a single vision for diversity and you have asked if this would be either damaging or helpful in the firm’s task of increasing diversity efforts. A few incidents or events triggered Monitor to begin thinking about diversity and inclusion programs. Currently there are three separate initiatives: the Advisor Network, Harassment Training and a series of seminars for women, and the Diversity Network. The purpose of the Advisors Network is to provide an outlet and resource for employees who need advice on issues such as succeeding at Monitor as either a woman, a person of color, or a GLBT employee. That initiative was created after the “Definition of Purpose” exercise done in 1993 surfaced issues related to the homogenous culture of the firm. Sexual Harassment and Sensitivity Training was deemed necessary after a 1991 director’s meeting. In that meeting, CFO David Kaplan stressed the need for “professional courtesy” training, and then the two female directors, Liz Martineau and Caroline Firstbrook disclosed that they had experienced “gender-related insensitivity”. Another thought of Martineau and Firstbrook was that female consultants were in need of role models to help guide them through the barriers of being a female in the consulting industry, which led to a seminar in 1994 geared...
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...4440 APRIL 27, 2012 DOROTHY LEONARD SUNRU YONG Bella Healthcare India Joseph Cherian, country director of Bella Healthcare in India, wondered whether his team was ready for Project TKO. He listened intently as Jeremy Manning, his director of research and development, described the pros and cons of the project, a proposal to develop a new portable electrocardiograph machine (EKG) specifically for the Indian market. Cherian believed the time was right to tackle the tough, but fast-growing Indian market. The key question was whether Bella India’s local R&D team, under Manning’s direction, was ready to lead the product development: My goal has always been to develop products that serve emerging markets and make healthcare more accessible. I think medical device companies are learning that this can be done most effectively by those who know these markets best. We should develop our affordable EKG in India, for India. Bella India has proven itself in manufacturing and cost- engineering; this is the next logical step. The endeavor was not without risk. The costly failure of Project Baton, a global product development effort, was fresh on everyone’s mind. Failure with Project TKO would not only hurt Bella Healthcare’s overall profitability, it would undermine Cherian’s case that the India operation was ready for more challenging product development undertakings. Industry Background: Electrocardiogram Equipment Electrocardiography, commonly referred...
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...America ahead of Europe in naval matters. The impact and influence changed naval warfare’s forever by forcing wooden ships to become obsolete. The Ironclad was among the first technological and modern tools of war. Its impact on technology in navies can still be seen today in the designs and the construction of naval ships.(Mac Bride,1) It has impacted technology in the way ships are built. Because of the ironclads the ships that are used in wars today are much safer. They are stronger and easier to maneuver. The first ironclad to ironclad battle between the Merrimac and the Monitor was long and drawn out. Although neither one emerged victorious, the world began to see what a major improvement in warfare these ironclads were. A reporter from the Norfolk Day wrote: “This work will create a revolution in naval warfare. America’s improvement has impacted naval history in a way that no other invention ever has!” Many times in United States history the major nations of the world, such as England, France and Germany, have ignored the United States in political matters but this invention and the ironclad to ironclad battle changed a large percentage of their attitudes toward the United States. It made America become feared and respected by large European nations and all the major nations looked at this invention with pure respect and awe. The invention of the ironclad has helped to push America higher on the ladder to becoming a major world power and to be included in major decisions of the...
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...Health Hazards in the IT profession When you tell someone you are in the IT profession they usually come back with something like “oh so you get to sit around all day playing on a computer!” The truth is there are lots of risks with “sitting around playing on a computer”. Being at a desk and in front of a computer can be just as hazardous as being a construction worker or a mover for a moving company. There are health hazards that go along with sitting all day. Blood clots from lack of movement, the lighting of the computer screen which cause headaches and eye strain. With a busy work environment, often time there is no time for a nice long lunch hour which leads to grabbing something quick and usually not the healthiest on the menu. This is just to name a few of the problems with being an IT. It’s hard to believe an industry such as Information Technology can actually be hazardous to your health. Did I mention stress? Although there are a lot of physical issues that come with the IT profession, I would like to focus on the stress of the IT profession. It was not long ago that I worked in an office environment and had no idea what it took to be an “IT person”. I was one of the many that complained about how long it took to get and IT person to look at my computer to see what was wrong with it. Until now, I had no idea. With the tighter budgets caused by the economic strain, there has been a problem with understaffing in the IT field. Unfortunately, understaffing...
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...sizes, but the most common are the 50 pin connector for the A-type narrow SCSI cable, and the 68-pin connector for the p-type wide SCSI cable. IEEE 1394 also known as fire wire uses serial communication, it is very fast, hot swappable, and is especially useful when transmitting streaming media. Multimedia devices such as microphones, earphones, and speakers are usually located at the back of the CPU, but in some cases there is a second set on the front of the computer as well. Clip 2 Summary: There are two types of computer monitors on the market today, the older CRT monitors, which are big and bulky and the newer LCD monitors which take up less desk space.CRT monitors use cathode ray tubes and LCD monitors use a technology called TET also referred to as active matrix. Refresh rate and response time are both terms used to refer to the amount of time it takes to create a new image on the screen. CRT monitors supports many resolutions but an LCD monitor is designed to support a fixed resolution called native...
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...TANDBERG C series Faultfinding Guide Version 2.0 TANDBERG University Contents Introduction to Fault Finding 1 Telephone support guide 1 TANDBERG C Series Diagnostics 2 C series Common Faults Guide 4 I cannot see myself 4 I cannot see the far end 4 I cannot hear the far end or they can’t hear me 5 The system won’t power up 8 The screen is blank 8 The remote control is not responding 9 No menus are visible on the system 10 The Sound quality is very poor 10 I can hear myself back 11 I have no LAN connection 13 Gatekeeper registration failed 13 Poor video Quality on IP (Packetloss) 13 C series Advanced Diagnostic tools 14 Setting up a direct serial connection 14 Setting up a LAN connection 15 Fault finding methods 15 Root Access to API 16 IP Ping 16 IP trace route 16 Netstat 16 Admin access to API 17 Gatekeeper settings 17 Gatekeeper status 18 Configuration back up and restore 19 Configuration back up 19 Introduction to Fault Finding As a first step you need to establish what equipment is present. Easy if you are on site but harder by phone. If you have a good database then this is straight forward but if you are not so lucky or you are assisting a customer with a connection that may not involve one of your supported units then it is advantageous to know the following: • Make and model of equipment • A description of the fault • Had the system been functioning previously? • Has the...
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