...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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...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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...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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...On Sunday 11/22/15 at approximately 0739 hrs. Security Monitor Rasheen Davis was informed by resident Miguel Herrera that resident Rodney Shafer DOC #HR7092 was not breathing or responding when he attempted to wake him in Room 3-2B of Building 417. Security Monitor Davis contacted Specialist Maurice Butler and informed him of the incident. Specialist Butler, Specialist Bausbaugh, Specialist Madera, Security Monitor Davis, and Security Monitor Pollard all went up to the residents room and found resident Shafer not breathing and with no pulse. Security Monitor Davis immediately called 911 at 0741 hrs. Specialist Bausbaugh contacted Operations Manager Christopher Lynn at 0745 and Specialist Madera contacted Facility Director Michael Critchosin...
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...controlled workplace with close manager supervision and surveillance. Even though I don’t agree with this environment, I think Mr. Edens’ behavior has been ethical and acceptable. Lockbox Processing: No Place to Hide Mr. Edens’ company, Electronic Banking System Inc., specializes in “lockbox processing.” Due to the sensitive nature of this financial service, Mr. Edens has implemented many controls to monitor his employees. Workers handle thousands of dollars in checks and cash, and thus they need to be monitored closely. These controls are designed to limit theft which reassures customers that their money is safe. Managers sit at the front of the room on raised platforms; other supervisors watch employees from the rear. While some may consider this approach intrusive, these techniques exist in many workplaces today where employees come in direct contact with money. Mr. Edens’ employees work in an area called “the cage.” No talking is permitted, the windows are covered, and many common items that workers usually have at their desks are banned. Mr. Edens is able to monitor this environment with a series of eight cameras which have the ability to zoom in closer on employee’s activities. Personally, I think these tactics are not socially responsible. He is creating a hostile environment, building distrust, and negatively motivating people. I would expect a high turnover rate of employment. On a positive note, Mr. Edens is taking advantage of job specialization, which...
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...PRACTICAL USE OF ICT EQUIPMENT TO DELIVERY INSTRUCTION HAND BOOK ICT Equipment for Instructional Delivery Introduction: ICT stands for Information and Communications technology. It is a suite of electronic devices connected together to process data and disseminate information in a consistent manner. In a learning environment it is the term used to cover all the computing and telecommunications used for research, teaching or administration; Studies show that the use of ICT equipment in the classroom has enhanced learning and teaching. It also facilitates group work and collaborative learning. Its benefits include: Alternative way to teaching /learning; Makes teaching and learning easier and better; Customised curriculum and applications; Makes teaching and learning more diversified and interactive; Technological configuration for each classroom: Each classroom should be equipped with the following: Digital/Multimedia projector: is a device that receives a signal and projects the corresponding image on a projection screen using a lens system. It takes a signal from a Computer, TV or Video source to produce a larger image using a projector light and displays it on a screen. Digital Projector Visualisers: Otherwise called document cameras, are real-time image capture devices for displaying an object to a large audience. Like an opaque projector, a document camera is able to magnify and project the images of actual, three-dimensional objects, as well as transparencies...
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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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...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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...------------------------------------------------- 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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...Pallavi Asrodia, Hemlata Patel / International Journal of Engineering Research and Applications (IJERA) ISSN: 2248-9622 www.ijera.com Vol. 2, Issue 3, May-Jun 2012, pp.854-856 Network Traffic Analysis Using Packet Sniffer Pallavi Asrodia*, Hemlata Patel** *(Computer Science, dept., Jawaharlal Institute of Technology, Borawan, Khargone (M.P.) India.) ** (Computer Science, dept., Jawaharlal Institute of Technology, Borawan, Khargone (M.P.) India) ABSTRACT In the past five decades computer networks have kept up growing in size, complexity and, overall, in the number of its users as well as being in a permanent evolution. Hence the amount of network traffic flowing over their nodes has increased drastically. With the development and popularization of network Technology, the management, maintenance and monitoring of network is Important to keep the network smooth and improve Economic efficiency. For this purpose packet sniffer is used. Packet sniffing is important in network monitoring to troubleshoot and to log network. Packet sniffers are useful for analyzing network traffic over wired or wireless networks. This paper focuses on the basics of packet sniffer; it’s working Principle which used for analysis Network traffic. Keywords- Packet capture, Traffic analysis, Libpcap, Network Monitoring, NIC, Promiscuous mode, Berkeley Packet Filter, Network analyzer, Packet sniffer. unresponsive to those packets do not belong to themselves by just ignoring. However, if the network interface...
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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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...Overview – This is a short guide to show you how to share your computer screen and control with someone else. You will need to be connected through VPN for this to work. This process will be easier if you are connected at an XTO office or Field Site with a wireless connection, however it will work while tethered or at home. Step 1 – Open Communicator and a Conversation Window The first step begins by opening up Microsoft Office Communicator. First you will expand the tray by clicking the small up arrow in the bottom right. Then you will double-click the Communicator icon in the bottom right of the screen as shown below. You will then see the Contact List for Communicator open up. It should look similar to this. At this point you will need to open up a conversation with the person you want to share control with. The easiest way is to type in their last name followed by a comma and their first name, and then simply double-click that name. Once the conversation window is open, you are ready to begin sharing your computer’s screen and control. Please Note: If an IT support personnel contacts you to assist you in some way, they will initiate the conversation with you, so that all steps prior to this, they will take care of. You will only see the conversation window on the right. Keep an eye out for the flashing orange square on the bottom of the screen indicating that they are attempting to contact you. Step 2 – Share Your Screen To begin a sharing session, you will...
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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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...Arguments about Computer dependency Since their invention, people far and wide have become increasingly dependent on computers. Computers have found their way into just about every aspect of our lives, and in most cases, they make things easier for us [4] . They allow us to work from home, socialize with our friends and family who live too far away to visit, and they provide an ever-welcome stress relief when we come home from school or work and just want to have some fun. But as we increasingly rely on computers to get through the day, the question begs to be asked: have we become too dependent on computers? Despite the many benefits of computers, there are also a number of arguments against them, one of which is the negative effect some believe they are having on children's education. Illiteracy is a growing issue, and many say that computers are to blame. In the past few years, many teachers have taken to shuffling their students off to a computer to type out short, quick assignments that could easily be written out by hand. While this isn't much of an issue for older students, it is an issue for the younger students who are just learning to read and write. Regardless of how much we're coming to rely on computers, printing and handwriting are a necessary skill to have. But typing out assignments has an effect on more than just the ability to print4. It can also negatively impact their spelling and grammar. While most programs now have spell- and grammar-check, they...
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