Mac Os X Essay Example for Free

Mac Os X Essay The Mac OS X Panther operation system has met with both technical and commercial success. Since the debut of Mac OS X in 2001, its features have continued to improve. The initial system Mac OS X 10. 1 was originally shipped in September 2001 and was referred to as Puma; Jaguar, version 10. 2, was shipped in August 2002, and Panther, the current version, was shipped in October 2003. The focus of this paper is on the key technologies that have made Mac OS X Panther a technical success such as CPU scheduling, symmetric multiprocessing, memory protection, and virtual memory; we begin with an overview of the MAC OS X operating system. Overview of Mac OS X Panther Mac OS, from Apple Computer, can be considered two families of operating systems: the older and now unsupported classic Mac OS (the system that shipped with the first Mac in 1984 and its descendants, culminating with Mac OS 9), and the newer Mac OS X. Mac OS X Panther is a UNIX-based Operating System with the intuitive user interface called Aqua. The modern core UNIX-based Operating System brings benefits such as protected memory and preemptive multitasking to Macintosh computing. Mac OS X Panther also has a sparkling user interface capable of visual effects such as translucence and drop shadows. The central characteristic of the Mac OS X architecture is the layering of system software, with one layer having dependencies on, and interfaces with, the layer beneath it (see Figure 1-1). Mac OS X has four distinct layers of system software (in order of dependency): Application Environments consists of the frameworks, libraries, and services necessary for the runtime execution of programs developed with those API. Mac OS X currently provides five application (or execution) environments: Carbon, Cocoa, Java, Classic, and BSD Commands. Application Services incorporates the system services available to all application environments that have some impact on the graphical user interface. It includes Quartz, QuickDraw, and OpenGL as well as essential system managers. Core Services incorporates those system services that have no effect on the graphical user interface. It includes Core Foundation, Open Transport, and certain core portions of Carbon. Kernel Environment provides the foundation layer of Mac OS X. Its primary components are Mach 3. 0 and FreeBSD, but it also includes networking protocol stacks and services, file systems, and device drivers. The kernel environment offers facilities for developing device drivers (the I/O Kit) and loadable kernel extensions, including Network Kernel Extensions (NKEs). This integrated kernel environment is called Darwin and it is an Open Source technology available from www. apple. com/darwin. The following is the components that Mach 3. 0 and FreeBSD provide: Mach †¢ support for SMP †¢ untyped IPC and RPC memory management †¢ support for real-time services †¢ external pager †¢ modular architecture †¢ improved performance BSD †¢ file systems †¢ networking †¢ basic security policies such as user IDs and permissions †¢ the system framework a mechanism for exporting APIs to the application layers †¢ the BSD process model, including process IDs and signals †¢ FreeBSD kernel APIs †¢ Pthre ads (POSIX threads implementation) [pic] Figure 1-1 System Layer CPU Scheduling The kernel environment of Mac OS X, specifically Mach, provides the fundamental thread support. Mach maintains the register state of its threads and schedules them preemptively in relation to one another. In general, multitasking may be either cooperative or preemptive. Classic Mac OS implements cooperative multitasking which was not very intelligent. In cooperative CPU scheduling the OS requires that each task voluntarily give up control so that other tasks can execute, so unimportant but CPU-intensive background events might take up so much for a processor’s time that more important activities in the foreground would become sluggish and unresponsive. On the other hand, preemptive multitasking allows an external authority to delegate execution time to the available tasks. Mac OS X’s Mach supports preemptive multitasking in which it processes several different tasks simultaneously. To affect the structure of the address space, or to reference any resource other than the address space, the thread must execute a special trap instruction which causes the kernel to perform operations on behalf of the thread, or to send a message to some agent on behalf of the thread. In general, these traps manipulate resources associated with the task containing the thread. Mach provides a flexible framework for thread scheduling policies. Mac OS X supports both the multilevel feedback queue scheduling and round-robin (RR) scheduling algorithm. The multilevel feedback queue scheduling algorithm partitions the ready queue into several separate queues and allows a process to move between queues. In the multilevel feedback queue scheduling algorithm, each run queue has various priorities that are handled in different ways. A multilevel feedback queue scheduling thread’s priority is raised and lowered to balance its resource consumption against other threads. Round-robin threads execute for a certain time quantum (time slice), and then are put at the end of the queue of threads of equal priority. Setting a round robin thread’s quantum to infinity effectively makes the thread run-till-block within its priority. Mac OS X internally has 128 priority levels, ranging from 0 (lowest priority) to 127 (highest priority).

Changing the Tone :: Personal Narrative Writing Papers

Changing the Tone Every piece of writing has a voice, we've already established that. But even in the same piece of writing, the same "speaker" or "voice" may take on different tones, depending on the purpose behind the writing. Sometimes it can make the piece a bit confusing, as if the speaker is distracted. However, I think that using different tones in the same voice makes that voice seem more human, more real, more identifiable. Basically, it makes me like the writing more, even if it is poorly done. After all, when I talk or write to someone, the conversation wanders and emotions change. If the writing does that as well, I feel as if I know a real person. I know that when I write my tone changes as I write, especially if there are other things going on at the time I write. And it always seems as if there is something around to distract me. Especially when there are other people with me, like right now. I wonder why it's so loud. Speakers! He gets so upset over speakers! Sometimes I just don't understand why he continues to buy things like speakers, hi-fi VCRs, and stereo components if they cause him to get mad like this. He says he enjoys adding to his entertainment center, but I find that hard to believe. He gets mad every single time he tries to hook the things up. And then, he thinks I'm the one who is getting upset. Please! In case he hasn't noticed, I don't like to be snapped at for no reason, just because he's mad that everything isn't going perfectly. I can't wait until he's finished! Oh, well, at least he's done moving furniture. Sorry about that. I just got so mad, and since I was writing at the time, let my situation into the paper. It does, however, show what I was saying at first. While I am still the same person I was at the beginning, my tone definitely changed. Yet it doesn't even take a subject change to make the tone change. Even if I continue to write about my boyfriend, who is the guy up there with the electronics addiction, my whole tone could change while I write about him. Because you know that if he is my boyfriend I must like him at least a little. Actually, it's kind of amazing that we're still together.

Ms2 Course Review

2013 Exam Review Session CGA MS2 Information Systems’ Strategy 1 Agenda Agenda will change as needed to suit your needs †¢ 2 pm Start. †¢ Introduction & Feedback Solicitation †¢ 2:10 – 2:30: Fundamentals of Business Case Analysis †¢ 2:30 – 3:45. Business Case Example/s †¢ Break 10 mins †¢ 3:55 – 5pm Review of key items from all modules †¢ 5pm Finish. 2 Nine-step approach to case analysis Spend about 40% of your time on the case – 90 minutes. 1. 2. 3. 4. 5. 6. 7. 8. 9. Skim the case. Read the case closely. Identify problems, threats, and opportunities. Analyze the data. Generate alternatives.Select the decision criteria. Analyze and evaluate the alternatives. Make a recommendation or decision. Determine Implementation steps & associated Risks. 3 Executive Summary (3 marks) †¢ †¢ †¢ †¢ Objective of the report Key problems/threats/opportunities identified State Alternatives (briefly) Recommendation s – Include completion date & Implementation strategy – Key Risk and mitigation (briefly) †¢ It should suffice as a Stand alone report REVIEW YOUR CASE†¦ 4 Current Situation (10 marks) †¢ List some of the strengths/ Strategic advantages †¢ Is there an existing system? What is wrong? – – – – – List & briefly explain the problems Categorize them if possible Determine Root cause, if there is one single cause? Business fundamental shortcomings? Conflicts? †¢ Does the technology used align / support the business model? †¢ Organizational misfits? †¢ Strategic misfits? 5 Current Situation contd†¦ †¢ What is the Impact? – Cost: quantified in $$ – Does it meet current or future business needs? – Intangible impacts – Strategic †¢ Threats †¢ Opportunities – Competitive – Technological 6 Criteria (5 marks) †¢ What is Criteria?What is it used for? †¢ State it at a high level where you can †¢ Prioritize the criteria – and show that you have done so. †¢ Explain why you chose each criterion †¢ Measuring each criterion? ($, market share/Sales, other goals) – Does it meet current or future business needs? – $ savings – Intangible benefits – Strategic †¢ Threats †¢ Opportunities – Competitive – Technological 7 Alternatives & Recommendation (15 marks) †¢ †¢ †¢ †¢ Improvise & use your imagination (just be logical). Each alternative should be a mostly complete Solution. Each alternative should be feasible.Assess each alternative based upon the criteria – show this analysis in your work. †¢ Other pros & cons (other than in the criteria) †¢ Alternatives don’t have to be mutually exclusive. They can be a combination of the options identified. †¢ Why did you choose the recommended alternative/s? – Benefit s – Explain how it achieves the objective/resolves the problem – Limitations / risks 8 Alternatives & Recommendation (Continued†¦) †¢ Make a recommendation (use a positive voice! ) – Do not just suggest something – Do not say it weakly or ambiguously †¢ I believe†¦ / In my opinion†¦ / My thoughts are†¦ Clearly recommend an action and explain †¢ what it is and †¢ why it fits the criteria. (if you have not already in the analysis). 9 Risk Management Plan (15 marks) Read Carefully the requirements of this section. Does it require an Implementation / Action plan as well? †¢ Narrative explanation – Implementation Strategy/Approach (at a high level)? – Assumptions / Requirements †¢ High level Risks, Ethical, Privacy issues? (Probability & Impact) †¢ Mitigation Strategies †¢ Plan ‘B’ †¢ Actual implementation steps and, within each step – Step Risk if any and mitiga tion plan if any †¢ †¢ †¢ Time Lines / Time Frame / Schedule Detail Costs Responsibilities Project Phases, if any†¦ short term, long term 10 Exam Review Session †¢ Go over Business Case – Tony’s Auto Services Inc. from 2010 June exam 11 Some multiple choice tips†¦ †¢ When answering a true and false question on the Exam simply break down complex sentences into smaller phrases. Each phrase has to be true or the entire sentence is false. †¢ And, for multiple choice questions try to answer the question before looking at the answer choices. Remember that a perfect answer may not be given as a choice.Choose the best answer. – Source Certified Fraud Examiners (CFE) Exam Coach. 12 Strategic Alignment †¢ Look for IT Strategy to support Business strategy. †¢ IT to differentiate from competition †¢ IT to reduce costs †¢ IT to bring business â€Å"Quick to market† †¢ IT to create new markets / products †¢ IT to tie suppliers and customers 13 Porter's five forces †¢ †¢ †¢ †¢ †¢ threat of new entrants bargaining power of customers bargaining power of suppliers threat of substitute products or services rivalry among existing competitors 14 Threat of New Entrants Mitigation Strategies: – High entry cost. Equipment, buildings, infrastructure, etc. – Mature Information Systems – Expertise & Knowledge – Compete aggressively on Price – Lock in partners for a competitive edge – Brand recognition. Product Differentiation. – Focus on a Market niche – Operating Efficiencies Pace of change – IT 16 Moore’s Law & Metcalfe’s Law †¢ †¢ †¢ †¢ Dropping price of computer Storage Dropping cost of processing (â€Å"mips†) Double the power every 18 months Metcalfe’s Law – The value of the network is the square of the sum of the nodes. Therefore stick with po pular technology 17 Strategic Planning for IS †¢ How is Planning done? – Top Down / Strategic Analysis – Bottom Up / Enterprise Analysis – Scenario Planning / â€Å"What if’† Analysis †¢ When is Planning done? – – – – – – Short Term Long Term Mergers & Acquistions Economic downturns As part of a Budgeting Exercise After a major disaster. 18 Planning Issues †¢ †¢ †¢ †¢ Scalability Capacity planning Standardization vs. differentiation Legacy systems – Upgrade to new system or integrate with new technology but old core. 9 Total Cost of Ownership †¢ †¢ †¢ †¢ †¢ †¢ †¢ †¢ †¢ †¢ Hardware Software Installation Training Support Ongoing Maintenance & S/W Upgrades Infrastructure costs Data Backups, Business Continuity, Insurance Downtime Space, Energy, Security 20 Six IT Decisions – IT should not make 1. 2. 3. 4. 5. 6. How mu ch to spend Allocation amongst Business Processes Firm-wide IT capabilities How much IT Security & Privacy issues Blame over failure 21 IT Governance 22 10. 3 OVERVIEW OF SYSTEMS DEVELOPMENT 23 Achieving Success in IS Projects †¢ †¢ †¢ †¢ †¢ clearly defined goals excellent communication management involvement definitive timelines Project management skills S. M. A. R. T Objectives. Why do they Fail? †¢ lack of understanding of the desired results (imprecise targets) †¢ poor estimating techniques for budgeting and scheduling †¢ small, unadjusted schedule slippage, which cumulatively results in a major delivery delay †¢ lack of project management skills or leadership †¢ poorly trained analysts and programmers †¢ conflicting goals and objectives among the project team members and users use of inappropriate software or hardware tools 25 Make Vs. Buy – Issues – – – – – – – â€⠀œ – Cost Specialized functionality Ability to integrate with other existing Systems Ability to change the s/w Maintenance / Service Contract Update / Upgrade Speed of delivery KNOWLEDGE – Business vs. Industry vs. Functional Responsibility vs. Control vs. Risk Conversion 27 Parallel †¢ Pros †¢ †¢ †¢ †¢ Least risk of not meeting objectives Compare results to ensure correctness Gentle weaning off of the ‘old’ system Resilient to errors. Cons †¢ Duplication of effort †¢ Requires additional computing resources †¢ Not possible in every situation 28 Pilot †¢ Pros – – – – Allows for a small, low risk, controlled test bed Allows for a Go-NoGo decision w/o large investment Limits disruption & harm Helps overcome user resistance †¢ Cons – Still Costly to run 2 systems – even if scaled down – Results may not extrapolate to ‘full install’ – Choice of Pilot site is critical 29 Phased †¢ Pros – – – Incremental approach with functional Phase-in Allows for Phased Systems’ Development Allows time for orientation of the new technology Usually easier to manage the change †¢ Cons – Still running 2 systems, – Longer disruption 30 Direct Cutover †¢ Pros – Quick – Easy on resource utilization (only 1 system running) – Low cost †¢ Cons – – – – – – Risky Requires full training & preparation Requires ‘all hands’ on deck for Implementation Causes spike in Help desk calls Creates disruption, uncertainty, confusion Errors can cause Business Loss / interruption 31Internet as a business tool Advantages †¢ †¢ †¢ †¢ †¢ †¢ †¢ †¢ Wider Market exposure New ways to communicate (text, voice, video) Economical (ISP, programming, Shipping) 24x7x365 Anywhere, Anytime Off loads work to the customer Convenient for the customer if well designed. Quick & Easy to update / Change – Real time Consistent Information / Prices 32 Internet as a business tool Disadvantages †¢ †¢ †¢ †¢ †¢ †¢ †¢ †¢ Not everybody has access & high speed Impersonal & not so interactive No touch & feel of the goods Replacement for good business practice?Lack of consumer trust Legal challenges Socio-economic factors (availability of access) Privacy Challenges Groupware & Collaborative s/w †¢ †¢ †¢ †¢ †¢ MS NetMeeting / Communicator / Remote PC support Rolling out s/w updates and self healing s/w IBM Lotus Notes & Domino EMC Documentum Virtual Meeting, avatars , e-Rooms (SDLC Project Mgmt) Private Cloud computing – – – – VPN Storage space Applications Virtualization †¢ Data Warehousing †¢ Data Mining †¢ Business Intelligence s/w Strategic use of the Internet †¢ †¢ †¢ †¢ †¢ Cost Reduction Strategic Alliances Differentiation of products & services Customer Loyalty (custom mass production) Value Chains To take advantage of Internet Technologies: – Keep focused on Business Strategy (Internet doesn’t compensate for bad or missing strategy) – Simplify & Integrate your customer facing processes – to enable self service – Adhere to evolving IT standards Rationale for E-Business †¢ Diminished Information Asymmetry †¢ Richness vs. Reach †¢ Reduced transaction costs Ways to Reduce Costs Customer Self serve – Eliminate middle person – Customer data entry – Self research and reduced consultation time †¢ †¢ †¢ †¢ Reduced Staffing levels Reduced Re-work Streamlined communication Faster 37 Securing online transactions The key issues in a transaction processing environment are †¢ identification (Who are you? ) †¢ authentication (How can I be sure you a re who you say you are? ) †¢ authorization (What authority do you have to make whatever transaction you seek? ) †¢ privacy (How can we be sure our transaction is private? †¢ nonrepudiation (How can we each be assured that the other will not later deny the transaction? ). Benefits / Limitations of Networking †¢ Sharing – Printers, Drives, Scanners, etc †¢ e-mail †¢ Centralized Administration – Distribution of S/W, Policies, Patches, A/V – Tracking, monitoring, Backing up data – Remote repair & Support †¢ Groupware †¢ Limitations – Cost, Security, Vulnerability 39 Client – Server Computing †¢ Centralized Computing †¢ Distributed Computing †¢ Advantages – Data Security & Centralization – Administration – Off Loads processing to Clients Disadvantages – extra complexity – Cost 40 Advantages of Outsourcing †¢ cost savings through economies of scale and s cope †¢ infusion of cash through liquidation of computer assets †¢ facilitate transition of data centre from cost centre to profit/loss centre †¢ ability to rapidly introduce new technology and access IT talent †¢ Better Scalability †¢ focus on core competencies †¢ Allows an objective look at process improvement by O/S 41 Limitations of Outsourcing loss of direct managerial control †¢ difficulty in reversing decision †¢ outsourcer’s viability (financial strength, responsiveness, service, and so on) †¢ dilutes the strength of in-house staff – Unique, one of a kind application support? – Will key staff stay permanent or be rotated? †¢ †¢ †¢ †¢ †¢ †¢ †¢ vendor doesn’t know your business lack of flexibility untenable long-term contracts; fixed price versus service trade-off requires skills in partnership management strategic factors Privacy issues Monitoring / Managing Outsourcers 42 Risk Mitigation Strategies †¢ Risk Assessment †¢ Restrict Physical access Log all visitors – in/out †¢ †¢ †¢ †¢ †¢ †¢ Cameras, Card Readers, Security Guards Alarms & monitoring Intrusion Detection Systems (network) Firewalls Restricted Network access Policies, signoff, and Security Awareness training 43 Risk Mitigation Strategies Cont†¦ †¢ Authentication (know, have, and are) – Password Strategies, Single Sign-on, Pass Phrase †¢ Authorization (Open / need to know) †¢ Access invocation / revocation procedures – Hiring / Firing / Promotion †¢ Segregation of Duties †¢ Adequate Supervision & Sign offs †¢ Monitoring, Logging, Reporting, and Acting on Information. 44 Good Luck!! 45

So Much Inequality in Our World - 1677 Words

Global Inequality Most likely every single person in the world is going though an inequality and suffering from it in the society that we are living in such as racial inequality, gender inequality, income inequality, global inequality, and etc. Even though there are more people today joining organizations or associations to stop inequality than before, social inequality is keep growing. We need to think about why inequality is keep growing and not getting batter as the time goes. Growing inequality is the one of the biggest and most challenging social and economic changes that we have to make. People’s concern these days is inequality about the fact that richest 1% in United States have so much more than anybody else in America, and the fact that a lot of people are suffering from the poverty in United States. Today, the rate of people becoming homeless has increased enormously than it was in past few years, and it seems like the focus is only on the United States. It is true that inequality in Unites States is very serious issue and is totally out of whack; however, same issue has to be told to people about global inequality. Global inequality is actually way worse than it is in the United States; we are just not seeing it. Even though people know what the problem is some people might think that there is nothing we can do about it because that is how things go. As we think, rich people have more power, and mostly they rule the global economy. Therefore, I want to addressShow MoreRelatedThe World Of Civilization By Jean Baker Miller925 Words   |  4 Pagespersonality live among our society, It should be noted that physical traits of race, class and gender yields an equal, if not, a higher status of importance in our culture. Most importantly, it’s these three articles of humanity that classifies an individual’s place in the world of civilization. In an article by Jean Baker Miller, the idea of inequality among society is presented. According to him there are two types of inequality which is temporary inequality and permanent inequality. The main differenceRead MoreSocial Inequality Is An Important Issue In Today’S Society.1595 Words   |  7 Pages â€Æ' Social inequality is an important issue in today’s society. Today, people face many inequalities based on their gender, race, religion, and disability status, yet there are many different ideologies and ongoing debate about social inequality. There are three perspectives concerning the issue of inequality in America. This paper will analyze an article about social inequality, â€Å"Gender, Race, and Income Gaps† by Richard Hogan and Carolyn Perrucci, and how it applies to the viewpoints concerningRead MoreSummary Of Rent Seeking And The Making Of An Unequal Society By Robert Thurman1319 Words   |  6 Pagesthat our â€Å"land of opportunity† society is so filled with so much inequality? The poor are often the ones with losses. According to Joseph E. Stiglitz, the author of â€Å" Rent Seeking And The Making Of An Unequal Society†, individuals of society are made to believe that: â€Å"The poor, in this land of opportunity, have only themselves to blam e.† Millions of individuals in our society are losing jobs daily, but the one percent of the top class is not losing their jobs. As a result of this inequality, an egocentricRead MoreInequality : Inequality And Poverty1729 Words   |  7 Pages Inequality and poverty exist in our society because wealth and opportunity are inherited. If we all entered the world with an equal amount of resources, some would still rise above others but everyone would get the same chance to succeed in life. Since greed is one of the norms of our society, and wealth is passed from generation to generation, there will always be inequality and poverty. The system of wealth and inequality is actually pretty simple. It all boils down to a few things what youRead MoreGender Inequality : A Man Who Works Full Time1630 Words   |  7 PagesGender inequality is something that has been affecting our world for a very long time. You can see it all throughout history. From women entering the workforce for the first time, to women protesting on the street, fighting for the right to vote. The concept people don t understand is that this is still affecting our world today. Did you know that a man who works full time earns a median of $889 a week? Do you know how much a woman makes? A woman who works full-time earns a median of $721 a weekRead MoreSocial Inequality Essay1189 Words   |  5 Pagesnbsp;nbsp;nbsp;nbsp;nbsp;As we prosper through time, inequality is slowly less evident. A lot of people dont realize that although things are improving with time, inequality is still prominent in our society. The people that are failing to realize that there still is inequality, are the fortunate ones. They rise well above the poverty line, and usually live relatively economically sound lives. They are the people who are supplied with our societys benefits. nbsp;nbsp;nbsp;nbsp;nbsp;TheRead MoreA Doll s House By Henrik Ibsen837 Words   |  4 PagesMarriage and Inequality – is it a cultural affair? Agents of socialization help to dictate what is an acceptable form of gender role. The stage that is already set from birth within a family. Placed in the world and carried on with the world, it is reinforced by the way that society portrays what is acceptable, thus maintaining the overall picture that certain roles are assigned to a certain gender type. As with Nurture – which is the experiences, values, environment and upbringing that definesRead MoreGlobalization Of The United States853 Words   |  4 PagesGlobalization Globalization is a result of each country around the world, depending on one another for certain products as well as needing them to buy specific exports. Without it, no country can flourish and with it, there will always be inequality. It is something that is vital to our country as well as those around the world. The risk of inequality is outweighed by the possible benefits of globalization. After World War II, the United States began rebuilding itself and the economy. Along withRead MoreSocial Stratification On Social Mobility And Income Equality Essay957 Words   |  4 Pages Jeff (Xiaotang) Jing SO 101: INTRODUCTION TO SOCIOLOGY SOCIAL STRATIFICATION IN THE PRESS AMERICA REGRESSED IN SOCIAL MOBILITY AND INCOME EQUALITY For a long time, Americans believe that anyone who works hard and follows the rules can own a house, raise a family and have a decent life. Believe it or not, social stratification and inequality were aggravated in the last decades in the United States. Social stratification is a sociologicalRead MoreRacial Inequality : Guess Who 11352 Words   |  6 PagesRACIAL INEQUALITY IN GUESS WHO 1 The 2005 film Guess Who illustrates how racial inequality is present within society, and how race is used by our society to create and manufacture social categories. This film is about a black female named Theresa and a white man named Simon that fight against the racial inequality present within their society and choose to be together. Stereotypes, prejudice, ethnic chauvinism, and racism are prevalent concepts throughout the movie. Most of these concepts are displayed