The client server architecture

The client server architecture Abstract In this assignment we talk about the client server architecture and its model and about its advantage and compare them with each other. Also provide some solution and comments about Hures Company. Introduction:- We are now in modern age of technology. Like old time we do not need to do our daily things with pen and paper now. Modern technology gives us the power to saves the time and work become more easy without any hassle .Now multinational companies using computer for their all task. So its become more essential for everybody for their daily needs and work. Everybody now depending on computer so its really important to build up relation between computers to computers and then we also need a server means powerful computer with high requirement .Server serve Client means the user .If server cannot control the client request then its become more complicated for every single users for that regain system can be crash .and technology update time by time so the system needs to be updated. If any company crate a system that can serve 100 employee but they have like 300 employee its not possible to cover everyone needs also its become pain for everyone to work with that system. So we need better s ystem design means Better client server architecture. With the right level of attention to client/ server systems and application design. But poor design can ruin this utopian vision; making upgrades every bit as painful, time-consuming, and costly as installing a new mainframe. Colin White writes that the benefit of client/server computing is the availability of Hardware servers that scale from a small uni-processor machine to a massively parallel Machine containing hundreds, possibly thousands of processors. Corporations can now match the computing power of the server to the job at hand. If a server runs out of capacity, the old server can simply be replaced by a larger one. This change can be made without affecting existing client workstation users or the tools they employ. This provides not only scalability, but also flexibility in handling hardware growth as compared with central mainframes where an upgrade is a major undertaking that is both costly and time consuming. (Colin White, Supporting High-Performance DSS Applications, InfoDB 8(2) (1994), 27. ) Client-server architecture A web page (HTML page) that contains the same information for all users. Although it may be periodically updated from time to time, it does not change with each user retrieval. A program / script file executed on the web server in response to a user request. A CGI script is usually executed to process the data sent when a form filled in by a user is sent back to the web server. Server side scripting means that all of the code is executed on the server before the data is passed to the users browser. In the case of PHP this means that no PHP code ever reaches the user, it is instead executed and only the information it outputs is sent to the web browser PHP: Hypertext Preprocessor.PHP pages typically have .phtml,php or .php3 file name extensions. An open source technology. ASP: Active Server Pages .A Microsoft technology. Extension .asp. JSP: Java Server Pages .jsp pages contain Java code. SSI: Server Side Includes. Involves the embedding of small code snippets inside the HTML page. An SSI page typically has .shtml as its file extension. With this technology now its become really easy to create large website and maintain it easily. Introduction to 2-Tier Architecture Two-tier client/server architectures have 2 essential components A Client PC and A Database Server Tier Considerations: Client program accesses database directly. Requires to code change to port to a different database. Potential bottleneck for data requests .High volume of traffic due to data shipping. Client program executes application logic. Limited by processing capability of client workstation (memory, CPU) .Requires application code to be distributed to each client workstation. (Less than 50 users). Introduction to 3-Tier Architecture 3-Tier client-server architectures have 3 essential components: A Client PC An Application Server A Database Server 3-Tier Architecture Considerations: Client program contains presentation logic only Less resources needed for client workstation No client modification if database location changes Less code to distribute to client workstations One server handles many client requests More resources available for server program Reduces data traffic on the network Comparing both types of architecture Tier 2 architecture is therefore a client-server architecture where the server is versatile means it is capable of directly responding to all of the clients resource requests. In tier 3 architecture however, the server-level applications are remote from one another, i.e. each server is specialized with a certain task eg:- web server/database server. Tier 3 architecture provides: Flexibility. Increased security at each level. Increased performance. Benefits of the Client/Server Model Cost savings. Scalability. Manage workflow. Provide multi-tier service Instrumentality Disadvantages of the client/server model Client/Server architecture also has the following drawbacks: increased cost: due to the technical complexity of the server a weak link: the server is the only weak link in the client/server network, given that the entire network is built around it! Fortunately, the server is highly fault tolerant (primarily thanks to the RAID system) (http://en.kioskea.net/contents/cs/csintro.php3) Problem Faced by Hures Company and its solution:- According to the problems faced by Hures, its Primarily, its not that system they made for future use .it did not have that capability to the handle the future demands or needs of the company. the developer of the system did not focused on the future strength of the system or the adjustment of the system, different changes on both external and internal environment which change the over flow of information in the company. In order to come up with the current problem of Hures system, Client-Queue-Client can be applied as alternative architecture. This uses a passive queue which allows the client instances to communicate directly with each other, which will refine their request from the services. This is helpful for Hures because it can help to support and prevent any problems that are related with the server (Exforsys Inc n.d.).. Client queue is used in order to take track of the number of client connections. Therefore, the server can trace which resources the client has obtained, and the server can release the resources after the client connection breaks down (Chan Leong 2003). Intranet is a network that is built by using the same tools and protocols that are used by the global Internet but applied instead to the internal network of an organization. It can be describe like a closed-circuit television system, which can be viewed only by those people within the organization that owns the system (Lowe 2009). Intranet site is a web site that is viewable only to those within the network of an organization. Even though based on the same protocols as the World Wide Web, an intranet is protected from the outside world either by not being connected to the outside or through a series of hardware and software obstacles known as a firewalll (Matthews Matthews 2003, p. 64). The development of an intranet web site using secure log cons to access the information is not a new idea. Many corporate locations use a secure internal site for vital information to be used by employees of the corporation and management only. The design of such a site could be simple using HTML, Java and CSS and may provide a variety of links to various databases stored within the network server(s). Security features can be enhanced by requiring the changing of passwords on individual users every thirty (30) days. Obviously, one counter position of establishing an internal web site would be that of cost and implementation. Depending upon the OS of the server, it would be necessary to create the web site and establish users with passwords to access the site. This would take some time to develop and the amount of individuals accessing the site would have to be considered in the overall budget required for implementation. Threats to the security of any open network system will always exist. Proper network monitoring on a continuous level severely reduces the risk of infiltration from outside sources. Network security should be the most important aspect of any company/corporation within the network structure. Reducing allowable events such as user abilities to plug in devices to their individual workstations, remote monitoring using camera feeds in various places within the office. Again, the cost of this will be substantial however, to maintain the integrity of the network should be of the highest priority and can reduce the severity of lost revenue. Disadvantages in intranet that its really expensive to maintain and setup. Need high qualified people or team to maintain its resources. Peer-to-peer and client-server architecture have different advantages and pros. It enables to take advantage of the wireless and Internet technology, at the same time, take advantage of the privacy and security which can be offered by client/server system. Intranet and internet both are famous worldwide so i will develop daily basis and needs to upgrade time wise. References: Books:- Colin White, Supporting High-Performance DSS Applications, InfoDB 8(2) (1994), 27. Chan, A T S Leong, H V 2003, Cooperative Internet Computing, S:pringer. Lowe, D 2009, Networking for Dummies, For Dummies. Matthews, M, Matthews, C B Poulsen, E 2003, Microsoft Office FrontPage 2003: The Complete Reference, McGraw-Hill Professional. Website:- http://members.tripod.com/ChannuKambalyal/NTierArchitecture.pdf http://www.webdevelopersnotes.com/basics/client_server_architecture.php3 Exforsy:-Peer-to-Peer and Client-Queue-Client Architecture, http://www.exforsys.com/tutorials/client-server/peer-to-peer-and-client-queue-client-architecture.html [Accessed 17 February 2010]

causes world war 1 :: essays research papers

It can be said that the First world war was caused by the alliance system, which has a very weak argument, the alliance system had very little to do with the first world war, it did to some extent cause the size of the war, but its argument in my opinion is very weak. Many other causes lean towards the side against the alliance system causing the first world war, which I believe is credible. The alliance system did cause the size of the war as it caused countries to be pulled in. First made in the Franco- Prussian war. Alliances held countries to some sort of standard and normally required something of each participant. The triple alliance signed by Germany, Austria-Hungary and Italy bound each country to give military support in a case of war or â€Å"if any one member of the alliance was at war with any two great powers other members would come to aid†. When the entente was made it did not intend for reciprocal arrangements for support, though it did allow wide variety of arrangements negotiations to take place, one negotiation would have been of support in war. But by 1911 A.J.P Taylor said â€Å"the entente was in the process of disintegration.† and was not seen as strong, because of the triple alliance Germany came to Austria’s aid willingly, which plunged Germany into war. When Germany declared war on France and Russia, Austria- Hungary was pulled into that battle to fulfill their part of the alliance. This had four major powers fighting. Alliances pulled countries into war because if they were not followed a threat of retaliation would be expected. On the other hand. Other causes include Nationalists wanting freedom, causing the Slavs to ultimately assassinate the duke and causing hate towards to Austrian empire. Nationalism was also a major cause of war, it caused problems especially in Austria- Hungary and France. This same nationalism had brought Germany together a one country and who took Alsace- Lorraine from the French in 1870- 1871 in the Franco- Prussian war, and in recent times the Moroccan crisis which left the French with hatred as an attitude towards the Germans, the thought of revenge was also one that was favored by the French nationalists. While this unrest was happening in France, nationalism was also causing problems in the areas of Austria- Hungary, over here the nationalists were slavists

Auto Immune Disease

Autoimmune Disease: Lupus HCA/240 Lupus is a lifelong dangerous disease that causes the human body to intrude on one's immune system. Even our very own, latest superstar Michael Jackson had the autoimmune disease lupus. This disease causes tissue to be eaten, brain cells to stop working, organs to be destroyed, and so much more. As we all know, the body will shut down if all parts are not working properly. It is safe to say that the organs go hand and hand with one another. In other words, one can't work correctly without the others help.Usually, the immune system protects these things, but because the isease lupus has taken over it prevents the system from working properly. As the disease begins to spread across the body, it gives a domino effect whenever the organs stop working. The most common types of lupus are systemic lupus, discoid lupus, and subacute cutaneous lupus. â€Å"Systemic lupus may affect Joints, skin, kidneys, lungs, hear, blood vessels, nervous system, blood, and brain. Discoid lupus erthyematosus (DLE) causes a skin rash that doesn't go away.Subacute cutaneous lupus causes skin sores on parts of the body exposed to the sun† (Corbett, 2013). There are many different ways to tell whether or not one has developed lupus. â€Å"One way to tell whether or not you have lupus is the common symptoms including: achy joints (arthralgia), frequent fevers of more than 100 degrees Fahrenheit, arthritis (swollen Joints), prolonged or extreme fatigue, skin rashes and anemia† (Quinn). Not to say that if you are experiencing one of these symptoms you have lupus, but if it appears to be continuous it would definitely be something I recommend getting checked out.For example, IVe experienced fatigue, achy Joints and a few more ymptoms that were mentioned above but I come to realize that I also have these symptoms whenever my iron is low or whenever IVe had a long major workout. Lupus is a disease that shows no petty to man. This disease can develo p amongst any age group, male or female. However, statistics show that the targeted individuals are adult females and adult males. Parker- Pope (2009) states that lupus affects more women than men, and is more common among blacks and Asians. Therefore, we can conclude that it is very rare for children to be our targeted audience with this disease.Still to this day, scientists have not discovered exactly what causes lupus though. â€Å"Because many lupus symptoms mimic other illnesses, are sometimes vague, and may come and go, lupus can be difficult to diagnose. Diagnosis is usually made by a careful review of a person's entire medical history and a physical examination, coupled with an analysis of the results obtained in routine laboratory tests and some specialized tests related to immune status† (Quinn, n. d. ). There are several treatments tor lupus but untortunately no one nas come up witn a cure tor the disease.Treatments such as antimalarial drugs, corticosteroids, immu nosuppressive agents/chemotherapy are all used to help fight lupus. These treatments help to reduce pain and swelling, calm the immune system, reduce headaches, rashes, and prevent or reduce flares. â€Å"The hardest thing about lupus is that it's an invisible disease,† says Carolyn Sayre, 24, of Manhattan. â€Å"It doesn't necessarily confine you to a wheelchair or make you walk with a cane, but it makes you tired and achy and swollen and sort of makes you feel like every day you're waking up with a bad case of he flu† (Parker- Pope, 2009, ).With that being said, I can truly see how these types of diseases can be hard to diagnose or find warning signs of such harmful disease. I'm certain that each of us have at some point encountered more than one of the symptoms at the same time. Again, it is my advice to seek a doctor if one is having continuous symptoms as listed above earlier. Sayre is a prime example of exactly how horribly it affects one's body. l, myself have n ever had the flu, therefore I couldn't even begin to imagine the pain she suffered during this time.

Project Is Sustainability Based Learning Environment

TCHE 2329 Integrated studies Semester 2, 2015 Assessment task 3 Asli Yilmaz S3332218 Dear Richard, I have had time to analysis your grade six class and have a recommendation with a ‘big idea’ that you can apply to your problem based learning environment. My big ideas thoughts throughout this unit are that every organism and every system goes through different stages, actions have effects beyond immediate reactions and a state of balance. I have come up with a concept ‘Growth plan’. Students are to design a sustainable garden bed in their schoolyard to grow fruit or vegetables. Students are to investigate and explore different resources they can use, different plants, different environments and different circumstances to be†¦show more content†¦Students are required to do research on what recycled resources they need in order to build this garden bed (needs to include the wood for the fence – must be recycled, props to keep the birds away etc. A form of assessment for this project is reports given back by a different student in the group to the whole class of how their team is progressing and what steps they are taking to make this project sustainable and environmentally friendly. Students are also to make journal entries after each lesson and reflect on their learning and how their project is proceeding. I have decided this project will be suitable for your class because by reading the student’s profiles I was able to establish that students enjoy working in groups and care deeply about the environment and enjoy doing different activities based on the environment and sustainable living. Throughout this project will learn the different types of at home resources they can use in order to build an environmentally friendly environment, students will gain knowledge about how to protect their fruit and vegetables, what types of problems they can face during this process and how important communication is with their peers in order for this project to come alive. Students will gain knowledge on how to solve problems w ith less information using prior