Saturday, May 9, 2020

Top College Admission Essay Help Tips!

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Wednesday, May 6, 2020

Aspect Oriented Software Development Free Essays

string(53) " related to attributes of the system as a whole \(e\." The implementation of software applications using GOAD techniques results in a better implementation structure which has an impact on many important software qualities such as enhanced risibility and reduced complexity. In turn, these software qualities lead to an improved software development lifestyle and, hence, to better software. This report introduces to management and software development staff to the concepts of aspect- orientation software development. We will write a custom essay sample on Aspect Oriented Software Development or any similar topic only for you Order Now It presents why aspect-orientation is needed in modern software development and what its contributions are to the improvement of software design and implementation structure. The report also highlight AAA technology details though without probing much in particular, as it present the various concepts of GOAD. After reading this introduction, the reader will understand what GOAD is about, know its key concepts and terminology engaged to elaborate 2. Introduction As software systems becomes more complex developers use new technologies to help manage development. The development of large and complex software applications is a challenging task. Apart from the enormous complexity of the software’s desired functionality, software engineers are also faced with many other acquirement that are specific to the software development lifestyle. Requirements such as risibility, robustness, performance, believability, etc. Re requirements about the design and the implementation of the softwa re itself, rather than about its functionality. Nevertheless, these non-functional requirements cannot be neglected because they contribute to the overall software quality, which is eventually perceived by the users of the software application. For example, a better believability will ensure that future maintenance tasks to the implementation can be carried out relatively easily and consequently also with fewer errors. Building software applications that adhere to all these functional and non-functional requirements is an ever more complex activity that requires appropriate programming languages and development paradigms to adequately address all these requirements throughout the entire software development lifestyle. To cope with this ever-growing complexity of software development, computer science has experienced a continuous evolution of development paradigms and programming languages. In the early days, software was directly implemented in machine-level assembly languages, leading to highly omelet implementations for even simple software applications. The introduction of the procedural and functional programming paradigms provided software engineers with abstraction mechanisms to improve the design and implementation structure of the software and reduce its overall complexity. An essential element of these paradigms is the ability to structure the software in separate but cooperating modules (e. G. Procedures, functions, etc. ). The intention is that each of these modules represents or implements a well-identified subpart of the software, which renders the individual modules better reusable and evolvable. Modern software development often takes place in the object-oriented programming paradigm that allows to further enhance the software’s design and implementation structure through appropriate object-oriented modeling techniques and language features such as inheritance, delegation, encapsulation and polymorphism. Aspect-oriented programming languages and the entire aspect-orientation paradigm are a next step in this ever continuing evolution of programming languages and development paradigms to enhance software development and hence, improve overall software quality 3. 0 Fundamental ideas underlying aspects and aspect-oriented software development The notion behind aspects is to deal with the issue of tangling and scattering. According to Ian Somerville (2009), tangling occurs when a module in a system includes code that implements different system requirements and scattering occurs when implementation of a single concern (logical requirement or set of requirements) is scattered across several components in a program. 3. 1 What an Aspect is. Aspect is an abstraction which implements a concern. Aspects are completely specification of where it should be executed. Unlike other abstractions like methods, you cannot tell by examining methods where it will be called from because there is clear separation between the definition and of the abstraction and its use. With Aspects, includes a statement that defines where the aspect will be woven into the program. This statement is known as a pinpoint. Below is an example of a pinpoint (Ian Somerville, 2006) before: call (public void update* (.. )) This implies that before the execution of many method whose starts with update, followed by any other sequence of characters, the code in the aspect after the induct definition should be executed. The wildcat (*) matches any string characters that are allowed in the identifiers. The code to be executed is known as the advice and is implementation of the cross-cutting concern. In an example below of an aspect authentication (let’s say for every change of attributes in a payroll system requires authentication), the advice gets a password from person requesting the change and checks that it matches the password of currently logged -in user. If not user is logged out and update does not proceed. Aspect authentication before: call (public void update* (.. // this is a pinpoint { // this is the advice that should be executed when woven into // the executing system into tries = O; string swearword = Password. Get ( tries ) ; while (tries 3 userPassword thisuser. password ( ) ) { // allow 3 tries to get the password right tries = tries +1 ; userPassword = Password. Get ( tries ) ; if (userPassword thisuser. password ( then //if password wrong, assume user has forgotten to log out System. Logout (thisUser. uid) ; } // authentication (Ian Sommerville, et al. , 2006) 3. 2 Aspect Terminology Advice: the code implementing a concern Pinpoint: defines specific program events with which advice should be associated (I. E. , woven into a program at appropriate Join points) Events may be method calls/ returns, accessing data, exceptions, etc. Weaving: incorporation of advice code into the program (via source code preprocessing, link-time weaving, or execution time weaving) 4. 0 Why Separation of Concerns a good guiding principle for Software Development Separation of concerns is a key principle of software design and implementation. Concerns reflect the system requirements and the priorities of the system stakeholders. Some examples of concerns are performance, security, specific categorized in several types. Functional concerns, quality of service concerns, Policy concerns, System concerns and Organizational concerns. Functional: related to specific functionality to be included in a system. Quality of service: related to the nonfunctional behavior of a system (e. G. , performance, reliability, availability). System: related to attributes of the system as a whole (e. You read "Aspect Oriented Software Development" in category "Papers" G. , maintainability, configurability). Organizational: related to organizational goals and priorities (e. G. , staying within budget, using existing software assets). In other areas concerns has been categorized according to different areas of interest or properties I. E. High level implies security and quality of service, Caching and buffering are Low level while Functional includes features, business rules and Non Functional (systematic) implies synchronization, transaction management. By reflecting the separation of concerns in a program, there is clear traceability from requirements to implementation. The principle of separation of concerns states that software should be organized so that each program element does one thing and one thing only. In this case it means each aerogram element should therefore be understandable without reference to other elements. Program abstractions (subroutines, procedures, objects, etc) support the separation of concerns. Core concerns relate to a system’s primary purpose and are normally localized within separate procedures, objects, etc. And other concerns tend to scatter and cross multiple elements. These cross-cutting concerns are managed by aspect since they cannot be localized resulting in problems when changes are required due to tangling and scattering. Separation of concerns provides modular dependency between aspects and components. For instance we would like to maintain a system that manages payroll and personnel functions in our organization, and there is a new requirement to create a log of all changes to an employee’s data by management. It would mean that changes will include in payroll, number of deduction, raises, employee’s personal data and sass of many other information associated with employee. This implies that there are several codes that will require changes. This process could be tedious and you might end up forgetting changing other codes as well even not understanding each and every code. With aspects you old deal with a particular element only. In this case there won’t be redundancy of multiple codes doing the same thing. An update function could be implemented that would be called whenever you would want to implement a particular method. 5. 0 Aspect-oriented Approach 5. 1 Requirement Engineering In requirements engineering there is need to identify requirements for the core system and the requirements for the system extensions. Viewpoints are a way to separate the concerns of different stakeholders that are core and secondary concerns. Each viewpoint represents the requirements of related groups of stakeholder. The requirements are organized according to stakeholder viewpoint then they are analyses to discover related requirements that appear in all or most viewpoints. These represent the core functionality of the system. There could be other viewpoint requirements that are specific to that viewpoint these then can be implemented as extensions to the core functionality. These requirements (secondary functional requirements) often reflect the needs of that viewpoint and may not share there are non-functional requirements that are cross-cutting concerns. These generate requirements of to some or all viewpoint for instance requirements for security, performance and cost. 5. 2 Software Design Aspect Oriented Design is the process of designing a system that makes use of aspects to implement the cross-cutting concerns and extensions that are identified during the requirements engineering process. ADD focuses on the explicit representation of cross-cutting concerns using adequate design languages. ADD languages consist of some way to specify aspects, how aspects are to be composed and a set of well-defined composition semantics to describe the details of how aspects are to be integrated. (Chitchat, Awls Rashes, Pete Sawyer, Alexandra Garcia, Monica Pinto Larson, Jotter Beaker, Bedim Ticonderoga, Skibobs Clarke, Andrew Jackson, 2005) Like in object orientation, several aspect-oriented extensions to ML design language to represent aspect-oriented concepts at the design level. One of these ML extensions is ATOM. ADD in ML requires a means of modeling aspects using ML stereotypes. Is an approach of specifying the Join points where the aspect advice is to be composed with the core system. The high-level statement of requirements provides a basis for identifying some system extensions that may be implemented as aspects. Developing these in more details to identify further extensions and understanding the functionality required is to identify a set of use cases associated with each viewpoint. Each use case represents an aspect. Extension use cases naturally fit the core and extensions architectural model of system. Jacobsen and Eng (2004)) 5. 2. 1 Aspect-oriented Design Process Below is fugue 1 that illustrate the design activities of generic aspect-oriented design process Core system design is where you design the system architecture to support the core functionality of the system. Aspect identification and design Starting with the extensions identified in the system requirements, you should analyses these to see if they are aspects in themselves or if they should be broken down into several aspects. Composition design At this stage, you analyses the core system and aspect designs to discover where the aspects should be composed with the core system. Essentially, you are identifying the Joint points in a program at which aspects will be woven Conflict analysis and resolution Conflicts occur when there is a pinpoint clash with different aspects specifying that they should be composed at the same point in the aerogram Name design is the essential to avoid the problem of accidental pinpoints. These occur when, at some program Join point, the name accidentally matches that in a pinpoint pattern. The advice is therefore unintentionally applied at that point. 5. 3 Programming The goal of aspect-oriented programming is to provide an advance modularization scheme to separate the core functionality of software system from system-wide concerns that cut across the implementation of this core functionality. (Kim Mess and Tom Tour ©, 2007) APP must address both what the programmer can say and owe the computer system will realize the program in a program system. APP system: mechanisms are conceptually straight forward and have efficient implementations. 5. 3. 1 Joint Point Model A Join point model defines the kinds of Join points available and how they are accessed and used. They are specific to each aspect-oriented programming language for instance Aspects. In Aspects, Joint point are defined by grouping them into pinpoints. 5. 3. 2 Pinpoint A pinpoint is a predicate that matches Join points. A pinpoint is a relationship ‘Join point Boolean’, where the domain of the relationship is all possible Join points. 3. 3 Advice 5. 4 Advantages and Disadvantages of APP APP promotes clear design and risibility by enforcing the principles of abstraction and separation of concerns. APP explicitly promotes separation of concerns, unlike earlier development paradigms. This separation of concerns provides cleaner assignment of responsibilities, higher modularization and easier system evolution, and should thus lead to software systems which ar e easier to maintain. The process is to collect scattered concerns into compact structure units, namely the aspects. On the other hand, APP cannot be elegantly applied to every possible situation. . 0 Validation and verification Validation and Verification is the process of demonstrating that a program meets the real needs of its stakeholders and meets its specification. Validation or testing is used to discover defects in the program or to demonstrate that the program meets its requirements. Statement verification techniques focus on manual or automated analysis of the source code. Like any other systems, aspects-oriented systems can be tested as black-boxes using the specification to derive the tests. However, program source code is problematic. Aspects also introduce additional testing (Ian Somerville (2006)) 6. 1 Testing problems with aspects To inspect a program in a conventional language effectively, you should be able to read it from right to left and top to bottom. Aspects make this as the program is a web rather than a sequential document. One can’t tell from the source code where an aspect will be woven and executed. Flattening an aspect-oriented program for reading is practically impossible 6. Challenges with Aspect-oriented Systems One of the limitations of APP is that it is not supported by default on any programming platform. Although it seems to be gaining popularity, its implementation has been undertaken by third parties as extensions to development framework. This has resulted in some level of disparity on the features being implemented as some of the implementations only implement specific features making it difficult to use such frameworks in some situatio ns in addition to creating some confusion over the feature. AAA programs can be â€Å"black-box tested† using requirements to design the tests, but program inspections and â€Å"white-box testing† can be problematic, since you can’t always tell from the source code alone where an aspect will be woven and executed. 7. 0 Recommendations Adopting Aspect Oriented Software development will reduce repetitions of coding or Component maintenance and reuse has a great impact to the company. On the part of cost, the company can determine whether it is easy to maintain its systems or not. Using other development paradigm can be cumbersome hence increasing tangling and scattering. System performance will also be affected in such a way that there could be more codes doing the same thing. GOAD concepts reduce redundancy and increase system performance. All functional and non-functional concerns are dealt with in GOAD. On implementation of security, Design flaws and code errors or bugs old be some of the causes of security flaws in software. Unlike SOD, GOAD approach made Software Development easy with the separation of concerns leading to modularization in reuse. How to cite Aspect Oriented Software Development, Papers

Wednesday, April 29, 2020

Writing Tips On How To Write Essay Quickly

Writing Tips On How To Write Essay Quickly Usually, writing an essay takes some substantial amount of time and effort. The task gets more complicated if the essay needs to be written very quickly. Preparation is the key, so check out some simple tips for writing an essay when you have a limited amount of time. Start early One very wise man said that â€Å"well begun is half done†. Starting something is one of the most difficult stages of any process. If to talk about a creative process such as writing, everything is even more complicated. All creative people are subjected to procrastination, anxiety and any sorts of doubts about whether they can finish the task on time. To make a process develop, it is important to start no matter what, in order to make the inspiration flow. What’s more, the earlier you start, the better the results will be and the faster you will finish your essay. Know your topic It is important to hold in mind your topic all the time. You may keep the main subject of your investigation in front of you in a form of a sticky note or a printed reminder, in order not to lose the main idea while you put your thoughts on paper. It would be good to contemplate and envisage how your idea will develop before you start writing so that when you write, you will roughly know where you are heading. In such a way, it will be easier to write the essay quickly. Write imperfect first draft If you want to finish your essay as quickly as possible, start writing it without judging your text. You do not need to worry too much about the quality of your work at this stage. All you need to do is to express your idea as vividly as you can. Later on, you will be able to revise and edit your paper, but so far, constant thinking of small details will slow down the process. After writing the first imperfect draft, you will feel relieved, as your essay is almost ready and all you need to do is to correct small mistakes. Decide which part you will write first You may choose a traditional approach and start your writing with the introduction, continue developing the argument in the body paragraphs and finish your essay with the conclusion. However, many students find it useful to write the main body first, and only after that, they write an introduction and a conclusion. After the main part is ready, you are clear about the discussed idea, so it is much easier to formulate concise and powerful beginning and concluding parts. You can choose any of the options as long as you are comfortable with it and you are sure that it will help you write your paper quickly. Put the essay aside for some time You might face a tight deadline, but writing your paper in one sitting is not a good option and will not bring results that you need. Perhaps, you will reach your goal and manage to write your essay quickly, but the quality of your work will suffer. If time allows, put your piece of writing aside and get back to it later to review it with a fresh eye. This will help spot the errors that were not obvious to you previously. Writing an essay is a challenging task, especially if you have time limitations. We hope that our tips can help you in completing your assignment successfully. Last but not least, do not forget to reward yourself for all your hard work!

Friday, March 20, 2020

french revoluion essays

french revoluion essays The French Revolution last from 1789 to 1799. This war had many causes that began the revolution. Its causes ranged from the American Revolution, the economic crisis in France, social injustices to the immediate causes like the fall of Bastille, the Convening of he Estate-General, and the Great Fear. As a result of this revolution there many effects , immediate and long term. The immediate effects were the declaration of rights of man, abolishing of olds reign, execution of king and queen, the reign of terror, and war and forming of the citizen-army. The long term effects were the rise of Napoleon, spread of revolutionary ideas, growth of nationalism, and the The contributing factors to the French Revolution was the economic crisis in France. The French government had undergone economic crises, resulting from the long wars waged during the reign of Louis XIV, the losses incurred in the French and Indian War, and increased indebtedness arising from loans to the American colonies during the American Revolution. The American Revolution showed that they got economical and political freedom from Britain. This liberalism sparked many revolutions in Europe ,but in France the ideas of the Enlightenment and liberalism were put to their fullest test. The French people wanted rights and would later get these. Another reason was that the old regime was ineffective and it abused its power. The immediate causes of the French Revolution were that the Estate-General had to convene. Increasing political pressure and being faced with the total collapse of its finances, the Old Regime began to unravel. Almost immediately tempers arose regarding voting procedures in the upcoming Estates-General. In its last meeting, voting had been organized by estate, with each of the three estates meeting separately and each having one vote. In this way the privileged classes had combined to outvote ...

Wednesday, March 4, 2020

Desert Pavement Theories

Desert Pavement Theories When you decide to visit the desert, you usually have to go off the pavement, onto a dirt road. Sooner or later you arrive in the brightness and space that you came for. And if you turn your eyes from the distant landmarks around you, you may see another kind of pavement at your feet, called desert pavement. A Street of Varnished Stones Its not at all like the drifting sand that people often picture when they think of the desert. Desert pavement is a stony surface without sand or vegetation that covers large parts of the worlds drylands. Its not photogenic, like the twisted shapes of hoodoos or the eerie forms of dunes, but seeing its presence on a wide desert vista, dark with age, gives a hint of the delicate balance of slow, gentle forces that create desert pavement. It is a sign that the land has been undisturbed, perhaps for thousands- hundreds of thousands of years. What makes desert pavement dark is rock varnish, a peculiar coating built up over many decades by windblown clay particles and the tough bacteria that live on them. Varnish has been found on fuel cans left in the Sahara during World War II, so we know that it can form fairly fast, geologically speaking. What Creates Desert Pavement What makes desert pavement stony is not always so clear. There are three traditional explanations for bringing stones to the surface, plus a much newer one claiming that the stones started out at the surface. The first theory is that the pavement is a lag deposit, made of rocks left behind after the wind blew away all the fine-grained material. (Wind-blown erosion is called deflation.) This is clearly so in many places, but in many other places, a thin crust created by minerals or soil organisms binds the surface together. That would prevent deflation. The second explanation relies on moving water, during the occasional rains, to winnow out the fine material. Once the finest material is splashed loose by raindrops, a thin layer of rainwater, or sheet flow, sweeps it away efficiently. Both wind and water could work on the same surface at different times. The third theory is that processes in the soil move stones to the top. Repeated cycles of wetting and drying have been shown to do that. Two other soil processes involve the formation of ice crystals in the soil (frost heave) and salt crystals (salt heave) in places with the right temperature or chemistry. In most deserts, these three mechanisms- deflation, sheet flow, and heave- can work together in various combinations to explain desert pavements. But where there are exceptions, we have a new, fourth mechanism. The Born at the Surface Theory The newest theory of pavement formation comes from careful studies of places like Cima Dome, in the Mojave Desert of California, by Stephen Wells and his coworkers. Cima Dome is a place where lava flows of recent age, geologically speaking, are partly covered by younger soil layers that have desert pavement on top of them, made of rubble from the same lava. The soil has been built up, not blown away, and yet it still has stones on top. In fact, there are no stones in the soil, not even gravel. There are ways to tell how many years stone has been exposed on the ground. Wells used a method based on cosmogenic helium-3, which forms by cosmic ray bombardment at the ground surface. Helium-3 is retained inside grains of olivine and pyroxene in the lava flows, building up with exposure time. The helium-3 dates show that the lava stones in the desert pavement at Cima Dome have all been at the surface the same amount of time as the solid lava flows right next to them. Its inescapable that in some places, as he put it in a July 1995 article in Geology, stone pavements are born at the surface. While the stones remain on the surface due to heave, deposition of windblown dust must build up the soil beneath that pavement. For the geologist, this discovery means that some desert pavements preserve a long history of dust deposition beneath them. The dust is a record of ancient climate, just as it is on the deep sea floor and in the worlds ice caps. To those well-read volumes of Earth history, we may be able to add a new geologic book whose pages are desert dust.

Sunday, February 16, 2020

Personal Impact of Substance Abuse Research Paper

Personal Impact of Substance Abuse - Research Paper Example You came light at night and that is what made your eldest son to bring you over here. You need to see the fact that your kids need you right now. They are also going through the same phase as you are but they are trying to cope with it. They have already lost their mother and they do not want to lose their father as well. If you will go on to take alcohol like this, you won’t only destroy your life but you will also be responsible for snatching away the future of your kids. Instead of being calm and patient with them, you shout at them and indulge in arguments with your loved ones (Wolfenden, 2010). Whenever you drive with alcohol in your body and mind, you are risking your life. You exhaust yourself, you make yourself numb through alcohol and thus you do not have the energy to talk to your kids. It is necessary that you communicate with them. In this way, not only you will feel better but your kids will also feel better. If you will keep on taking alcohol, you will be subjecting yourself to heart diseases (Wolfenden, 2010). Moreover, these habits also lead to high blood pressure which in turn leads to strokes, acute kidney failures and in many sever cases, cancer. When you said that you have tried to stop, but could not, it is because you cannot get rid of this problem in a day. You need medical supervision when you withdraw from this alcohol abuse. The symptoms are direr when you stop taking it after a period of over dose. You will suffer from headache, nausea; increase in the heart beat level, decrease in appetite, tremors, exhaustion and sometimes insomnia (Wolfenden, 2010). But you should not worry because this all is normal when you withdraw from alcohol. After a month or two you start to feel immensely better. You will also be given some medicines to curb the urge of drinking alcohol. These medicines will be temporary and will be stopped after a certain time period. You need to organize your life once again, and I understand that it is easier said

Sunday, February 2, 2020

Safety Management Term Paper Example | Topics and Well Written Essays - 1250 words

Safety Management - Term Paper Example For any given manufacturing organization, the list of occupational hazards is very long. There may be health hazards from operating bulky, dangerous machinery that may injure or even kill the operator, working in improper positions, physical hazards such as too much noise, heat, inadequate lighting, and exposure to harmful radiations. There may also be exposed to chemicals like lead, cadmium, chromium, organic solvents and welding fumes. Plus, there are mental and psychological hazards from working long hours and in shifts. Specifically, in a car-manufacturing industry, there are some activities involved that have serious implications for health. In the manufacturing of battery for cars, there is a high incidence of exposure to lead and cadmium in case of lead-acid batteries and cadmium batteries respectively. Too much exposure to these metals may lead to chronic lung and kidney diseases that may prove to be fatal. Another fairly common activity in this sector is the welding or smelt ing of metals in order to construct the body of the car. This poses a risk of exposure to toxic materials like Sulphur dioxide and Welding fumes. In addition, the environment in and around the area in which the factory is situated gets polluted and affects the families living in them. All these occupational hazards are evident in the Toyota Group.In this respect, Toyota delivers not just the best cars made out of the most advanced set of tools and techniques but also in terms of high safety standards for its employees.