Sunday, October 6, 2019
World Conflict Essay Example | Topics and Well Written Essays - 3000 words
World Conflict - Essay Example on September 9, 2001 (now on the lips as 9/11 attack). As a part of the cold war going on, the soviets feared that Afghanistan was being eyed by the U.S. as a stand point from where it can threaten Soviet Union's mainland. Hence, reacting to this fear, the soviet army in 1979 moved with all the arms and ammunition into afghan land. The soviets were trying to force communism on the people of Afghanistan (in their bid to clear the region from any chance of it becoming U.S. military base that can pose threat to them. But the Afghans with America's support of heavy artillery and millions of dollar funding fought back. The financial help from America was to ensure that without its direct intervention, the afghan mujahideen (who have a historic track record of fighting continuously and fiercely till death for their homeland are well equipped against the technologically advanced soviet tanks and fighter planes. American troops were not involved in this war (Meher, page 122) The American support came in disguise through other Islamic countries like Saudi Arabia and Pakistan (Meher, page 199) etc because the direct intervention of America could trigger the next world war. The afghan jihads resisted the soviets well above the expectation of U.S. which was matching their performance with ever increasing million dollars each year. Now with the initial strong opening to the war from the Afghans, the next step was to make the war sustainable from Afghanistan side. For that to happen, more and more Muslim volunteer jihadis were required to pick up arms and fight. The funding helped to create madrassas (Muslim schools of Islam thought) which noticed Muslims turning up in large numbers and soon they were prepared with enough expertise to wage war. It was in these madrassas that Osama Bin Laden came to work as a volunteer in the war. Osama was Saudi national and with him brought big money as well and started helping the cause by working in construction purposes and in medical aid. The madrassas were established in the border region s between Pakistan and Afghanistan which in the future will give birth to "Taliban". Taliban and Al Qaeda were unitedly involved during post soviet war. And both became anti America after America withdrew funding and humanitarian aid. The soviets after suffering devastation and persistent resistance from the afghan fighters went into huge military losses of men and arms. At the end of war (May88), the soviets were defeated and they started their return (Wright, page 129) which was complete in 89. Afghanistan won with a major help from U.S. and the cold war ended with the fall of communism. Afghanistan victory brought happiness to common people who were the innocent victims in the war. However, immediately after the war the United States lost its interest in the region and avoided even any humanitarian policy toward the victims of soviet-afghan war and those of the civil war that followed because of lack of any established government rule. In result, lawlessness prevailed and whole o f the Afghanistan went into another fight, this time intra-nation. Seeing such an acrimonious act of denial, the people of Afghanistan and the
Saturday, October 5, 2019
Industry Environment Analysis Research Paper Example | Topics and Well Written Essays - 1000 words
Industry Environment Analysis - Research Paper Example However, the business can shield itself by use of the barriers to entry. Barriers to entry are those actions by the firm that increase the costs incurred by potential competitors for them to enter the market (Hill & Jones, 2012). Therefore, the higher the barriers to entry, the higher the costs incurred by competitors and, therefore, the lower the rate of entrance into the market. The common barriers used by industries include economies of scale, switching costs by customers, capital investments, government regulation, brand loyalty and absolute cost advantages. Economies of Scale Economies of scale refer to the benefits and advantages that accrue to a company due to its large size. Economies of scale usually arise from sources such as mass production by the firm, discounts awarded due to buying in bulk, and benefits received due to spreading fixed costs over a large volume of production. Because of a large volume of output, the industry also limits its marketing and advertisements c osts (Hill & Jones, 2012). Therefore, the profitability of a fast-causal restaurant will be affected if its size is small, which limits its economies of scale. However, it can focus on increasing its size in order to increase its economies of scale such as pricing benefits. ... For example, a restaurant could create new recipes for foods; it could also spice up its foods in a unique way as compared to those of its current competitors. Therefore, customers will get used to the products and will prefer the restaurant’s foods to other foods offered in the market (Hill & Jones, 2011). This is a feature referred to as customer loyalty; it is used to ensure that customers stick to the original supplier irrespective of any other suppliers in the market. Capital Investments The business can ensure that its profitability is maintained by investing in capital intensive projects which assure it high returns in the future. For example, a restaurant could invest in latest technological equipment of operation. Such an investment will lead to offering of quality services to customers, thus increasing the number of customers attracted. Consequently, the profitability of the business will be increased. New competitors will be barred from entering the market since the y will not have similar investments for them to compete in the market. On the other hand, the capital requirements needed to make similar investments will be extremely high, so any new business would opt not to enter the market (Kar, 2011). Absolute Cost Advantages Cost advantages for the business will arise from such angles as experience, high quality trained personnel, and control of crucial inputs of production in the market such as labor, raw materials and management skills. It could also have additional advantages such as access to cheap sources of finance and insurance benefits. Therefore, a new company in the market will be hindered from entering since it will not be able to match to the advantages of the
Friday, October 4, 2019
The Legalization Of Marijuana for Medical Use Research Paper
The Legalization Of Marijuana for Medical Use - Research Paper Example As a matter of fact, marijuana is proven to enhance appetite and relieve nausea in cancer and AIDS patients. Many people use marijuana because they are suffering from certain diseases that have plagued their lives. Clearly, marijuana provides relief from pain, nauseua, and other symptoms that cannot be treated with conventional methods of medicine. Several Americans insist that marijuana for inhibition purposes also. Furthermore, this drug has very low dependence of addiction and side-effects. Most marijuana users also insist that they tend to develop tolerance to many of the effect that this substance offers. Users also refute the fact that this drug is more dangerous than alcohol and tobacco. The second critical reason why marijuana should be legalized is the fact that maintaining marijuana out of society is expensive due to its illegal nature. Keeping marijuana illegal is expensive because it induces authorities to be in constant search of funding. In the United States, the government has gone on this myriad against â€Å"War on Drugs.†Currently, the US government spends a hefty amount of money to choose individuals who are regular marijuana users regardless of their need and want. These individuals get thrown in the prisons on a daily basis. Undoubtedly, these same funds can be allocated to pursue education, Medicare, social security and national defense. In an ideal world in which marijuana would be legal, the federal government would be able to impose taxes on it. Furthermore, it would have extra revenue that it could allocate for essential drug education program. It is evident that there is no solid evidence that prohibition of the drug will force society to diminish its use. Additionally, marijuana is widely available in schools as dealers understand that no set age limit is enacted. Seen as the â€Å"forbidden fruit†by many teenagers, the drug continues to attract students to relieve their stress. The
East Asian Essay Example | Topics and Well Written Essays - 1000 words
East Asian - Essay Example Qian had the prerogative to choose who, what, why and how things happened in his history. Qian chose to quote his sources as much as possible. An example is the account of the attempt made by Jing Ke on the life of the first Chinese emperor, which was an eyewitness account by the great-grandfather of his father's friend, who served as a low-ranked bureaucrat at court of Qin and happened to be attending the diplomatic ceremony for Jing Ke. Qian also created highly probable and consistent events even when there were none available. His work eventually consisted of 130 chapters about Dynastic houses, the biographies of the Han emperors, dates of events, descriptions of rites and rituals, music, and various other topics of interest. Also included were the histories of the states which existed during pre-Qin China and the biographies of other important personages in history. Before The Records of the Grand Historian, historical texts tended to downplay the role and events from other dynasties and played up their own. This tendency was also present in Sima Qian's historiography. Qian portrayed the Han dynasty as having the Mandate of Heaven and gave lesser importance to the dynasties that preceded it. Among the features that Qian emphasized in his work was the ascendant character of the Han Dynasty. Consequently, he depicted the preceding Qin dynasty, which was Legalist, as evil and as such deserved to be replaced by the Han which prescribed to Confucianism. This theme is recurrent in his biographies which often contained moral lessons and anecdotes. Qian also took every opportunity to point out that Legalist ideals which were abundant and commonplace in the Qin Dynasty did not benefit anyone unlike Confucian ideals which redounded to benefits for the people. Examples of these biographies which justified the ascendant moral plane of the Han were the Chen She, Han Xin and the Empress Lu. This bias of Qian's against the Qin dynasty is fairly evident throughout The Records of the Grand Historian. Qian's favorable disposition towards Confucianism is explained by his belief that it is a more preventive means by which to keep peace among the peasants. He believes that fair, just and moral rulers will beget fair, just and moral peasants for them to rule. This common nature when achieved among both rulers and peasants would result in peace, according to Qian's beliefs. In contrast, he believes that the Legalist approach is able to preserve peace through the rule of a tyrannical government. He contends that a tyrannical government places all its constituents, peasants, nobles and ministers alike, under threat of mistreatment and enslavement. Qian also pointed out that there are major differences in how the Qin and Han perform their rites and treat their ancestors. In Confucianism, rituals and ancestors were central in their beliefs. This was exemplified in the biographies of Han Xin and Chen She. Qian pointed out that the latter's grave was cared for by thirty families which saw it as an honor to perform such duty. Qian also related how Han Xin buried his mother "on a high broad expanse of earth with room enough around to set up 10,000 households," similar to the treatment received by an honored ruler. Both personages were practitioners of Confucianism in their lifetime and were correspondingly rewarded with power and influence. In contrast, Qian's biography of the
Experiential Leadership Essay Example for Free
Experiential Leadership Essay Executive Summary  The researchers’ aim is to point out to the effect of Experiential Leadership in the selected company liked Barras Home Improvements. Background:  The Progress Report Name of the Business Manager of Barras Home Improvement Company is Mike Allen. He supervised 16 employees. Eight of them were assigned in office and eight were outside in the field. Nature of business/service market Barras Home Improvements was formed in 1987. During the past year, the company has positioned itself as a leader in the sales and home improvement. Home Improvement is the field of expertise in fact customer can easily choose their desired lay out for their home improvement, guided by the advice support to meet the great improvement of the home. In addition, they are now celebrating a twenty years in service. Barras Home Improvements Company is classified as family Business. They have large selection of Kitchens, Bathrooms and Bedrooms gallery lay-out or so called showrooms. Their mission statements are choice and value for money, service and quality product, and first class workmanship. The purposed of the operation of the company is to provide customer with highest standards of quality and service. Their products are sinks, taps, wall and floor tiles, Amtico flooring and shower enclosures and etc. They are also specialised in the complete installation service covering every aspect from plumbing and electric’s, plastering and minor building work and tiling to maintenance free ceilings. Insurance work is also undertaken and a 12 month written guarantee is given on all our work. We are both CORGI and NIC EIC registered. They also have a promotion of  £50.00 deposit only for the customers instillation fee Customer scope and demographics The informational data that the company can offer to the customer is as follows: Local: This Company is situated at the top of Clay Lane, off Ball Hill Shopping Centre on the Walsgrave Road. M6 –  Heading South: Leave M6 at Junction 3. Follow A444 towards Coventry. Turn           left into Mercer Avenue and the showroom is at the top of this road, which is at           the junction of Clay Lane. M6 – Heading North: Leave M6 at Junction 2. Follow signs for the A4600 heading towards Coventry City centre. At Ball Hill shopping centre on the Walsgrave Road turn right into Clay Lane and our showroom is at the junction with Barras Green and Mercer Avenue.  Organizational Structure of the Barras Home Improvement Company Organization’s Workforce The Barras Home Improvement Company was subdivided into two groups of 8 in the office and 8 in the out field for installation and contractors. The people in office were responsible for customer service and do some paper works and entertain clients or customer. And in addition they lead the customer on the computer lay outing for the home improvement processing. Presentation Situation; The current situation of the organization is very exciting. Recently, business has relocated to a larger and more efficient facility. This move will enable the company to streamline its method of operation and increase its bottom line. Market environment; The market place is undergoing tremendous technological change. New Technologies of Home improvement and materials are making products increasingly attractive stronger and less costly. The business is poised now to take advantage of these changes, and expect to become an important supplier of home appliances and home improvement installation. Products and Services; The raw material and other home appliances that we are using were the latest awith high quality materials. This is primarily due to the strong influence of committed manufacturers and the demands of the appliances and raw materials. Gathering and Collection of Data: This investigation adopted the descriptive method of research as this is the appropriate way in evaluating the manager of the Barras Home Improvement Company in relation with his experience in Leadership Management style and behavior. This will be viewed from the responses of his 16 employees in the company. The descriptive method is also defined as studying components to serve as direction in reaching the goal. Its purpose is to tell what exist or what is about a certain business phenomenon, predicting and identifying relationships among and between the variables describe. The data and information was gathered through interview of some customers of Barras Home Improvement Company, employees and through internet the profile of the company has been gathered and studied.  Facts: The company is still a leading company in terms of home improvement because of the experienced manager of the company. The trend of the company was remarkably improving because of the good feedback and referral of the customer. They have the additional benefit of being able to provide a computer aided photo-realistic image that can even show the kitchen, bathroom or bedroom in the finish of their own choice. The Actual Report  Executive Summary  This paper studies the company named Barras Home Improvements (BHI). The purpose of this study is to evaluate effectiveness of the Experiential Leadership Manager to the Business Flows specifically in family business like BHI. This study was conducted to enlighten other businessmen in the market place to exercise Experiential Leadership Management. Background: Barras Home Improvements was formed in 1987. During the past year, the company has positioned itself as a leader in the sales and home improvement. Home Improvement is the field of expertise where a customer can easily choose their desired lay out for their home improvement, guided by the advice support to meet the great improvement of the home. In addition, they are now celebrating a twenty years in service. Barras Home Improvements Company is classified as family Business. They have large selection of Kitchens, Bathrooms and Bedrooms gallery lay-out or so called showrooms. The purpose of the operation of the company is to provide customers with highest standards of quality and service. Their mission statements are choice and value for money, service and quality product, and first class workmanship. Their products are sinks, taps, wall and floor tiles, Amtico flooring and shower enclosures and etc. They are also specialised in the complete installation service covering every aspect from plumbing and electric’s, plastering and minor building work and tiling to maintenance free ceilings. Insurance work is also undertaken and a 12 month written guarantee is given on all our work. They are both CORGI and NIC EIC registered. They also have a promotion of  £50.00 deposit only for the customer’s instillation fee Definition of the Problem   The objective goal of this research is to evaluate the strength and weaknesses of experiential leadership management in business. The Barras Home Improvement is the company that will be treated on this study. Initially, a simple random sample of 16 employees will be given a baseline test organized by the researcher. The results will be compiled for later comparison with the research results, and those initially tested will no longer take part in the study. Questionnaires are one of the most popular ways in which data may be collected. These are used for a range of purposes and will often be the tool used to collect quantitative data. But it is worth mentioning that although this may be classified as mostly a quantitative process of collecting data it may also be a qualitative method, depending on the number, depth and style of the questions. Research questions This study sought to evaluate the Business Manager of Barras Home Improvement Company. Specifically, it aimed to answer the following questions: How to determine the degree that the person like working with task and people? What is the Leadership dimension of the Business Manager of Barras Home Improvement Company possess? What practice of leadership style does the Business Manager of Barras Home Improvement Company have? Is there a significant effect on experiential leadership management to the Barras Home Improvements company employees?  HYPOTHESIS: Ho      :  There is no significant effect on experiential leadership management to the Barras Home Improvements employees.        THEORETICAL Framework            the theoretical framework adopted for this study may be reflected in this model below. Input                                             Process                         output  Figure1. This paradigm was used to determine the effect on experiential leadership in the Barras Home Improvements.           This model suggests that Leadership behavior and leadership style survey questionnaire may be anchored on the manager of Barras Home Improvement Company who is Mike Allen. The conceptualization of this study revolved around the notions clearly represented by this model. The paradigm of the study consists of the inputs that contain all those which have been studied in this research. The process consists of the survey questionnaires that were used to analysis the company data. The output consists of the effects of Experiential Leadership Management to the company performance. Analysis of Variance was also used to treat the data statistically. Research design  Sample Size: All the employees were included in the sample and then the researcher calculated the weighted mean of the survey questionnaire to determine the effect of experiential leadership. Sample selection: Employees of Barras Home Improvements company were selected as sample selection of this study Instrument used: This study used a survey questionnaires of leadership behavior and leadership style  Editing of data: Standard editing and coding procedures with MS-EXCEL program. Analysis of data: Simple tabulation and cross-tabulation used. RESULTS: The following results were gathered and tabulated with the use of leadership survey questionnaire: This study reveals that the Manager of Barras Home Improvements Company has a characteristic of a Team leader. This is because the score 6.9 in the people section and a score of 7.3 in the task section revealed it. The quad where the two lines intersect is the leadership style in case of Team Leader quality. The manager used delegative and democratic leadership style. Sometimes he also used autocratic leadership style may be because it is necessary and it is revealed in the scores that 26 means being autocratic. This means that the style was used in some cases where the problem arises or decision making is required in the process for humanitarian sake. Conclusions: From the results of the experiential leadership management evaluation the following conclusions were drawn: The more experience the manager have the more effective and organized the business is. Experienced manager has more wisdom than an autocratic manager or even none experienced leader. Managers need to be team leaders for building much effective and successful business. A Team leader is the most ideal manager a company needs. Recommendation: This study suggests every businessman to undergo on the survey questionnaire to identify if their characteristics are autocratic, democratic or free reign. The new public relation officers must widen the scope and topics. Leadership Questionnaire Questionnaire Below is a list of statements about leadership behavior. Read each one carefully, then, using the following scale, decide the extent to which it actually applies to you. For best results, answer as truthfully as possible. Never         Sometimes         Always                                           0      1     2       3         4          5 _______ encourages team to participate when decision making time comes and also attempts to implement ideas and suggestions. _______ â€Å"Nothing is more important than accomplishing a goal or task†. _______ closely monitor the schedule to ensure a task or project will be completed in time. _______ enjoy coaching people on new tasks and procedures. _______ â€Å"The more challenging a task is, the more he enjoys it. _______ encourages employees to be creative about their job. _______ seeing a complex task through to completion, he ensures that every detail is accounted for. _______ found it easy to carry out several complicated tasks at the same time. _______ enjoy reading articles, books, and journals about training, leadership, and psychology; and then putting what have been read into action. _______ when correcting mistakes, he do not worry about jeopardizing relationships. _______ He manages time very efficiently. _______ He enjoys explaining the intricacies and details of a complex task or project to my employees. _______ breaking large projects into small manageable tasks is second nature to me. _______ nothing is more important to him than building a great team. _______ He enjoys analyzing problems. _______ He honors other peoples boundaries. _______ He Counsels his employees to improve their performance or behavior which is second nature to me. _______ He enjoyed reading articles, books, and trade journals about my profession; and then implemented the new procedures he learned.   Scoring Section Put your answers on the spaces provided for every question. PEOPLE TASK  Question 1.______ 4.______ 6.______ 9.______ 10.______ 12.______ 14.______ 16.______ 17.______ TOTAL ________ X 0.2 = ________  Question 2.______ 3.______ 5.______ 7.______ 8.______ 11.______ 13.______ 15.______ 18.______ TOTAL ________ X 0.2 ________ Leadership Style Survey Directions: This questionnaire is about leadership style ideas. Please encircle any of the number provided for at right-end of each item/statement to express your honest judgment by using the following code: Category                                                    Weight Almost Always True                                          5 Frequently True                                               4 Occasionally True                                            3 Seldom True                                                    2 Almost Never True                                           1 1. I always retain the final decision making authority within my department or team. 5 4 3 2 1 2. I always try to include one or more employees in determining what to do and how to do it. However, I maintain the final decision making authority. 5 4 3 2 1 3. I and my employees always vote whenever a major decision has to be made. 5 4 3 2 1 4. I do not consider suggestions made by my employees as I do not have the time for them. 5 4 3 2 1 5. I ask for employee ideas and input on upcoming plans and projects. 5 4 3 2 1 6. For a major decision to pass in my department, it must have the approval of each employee or the majority. 5 4 3 2 1 7. I tell my employees what has to be done and how to do it. 5 4 3 2 1 8. When things go wrong and I need to create a strategy to keep a project or process running on schedule, I call a meeting to get my employees advice. 5 4 3 2 1 9. To get information out, I send it by email, memos, or voice mail; very rarely is a meeting called. My employees are then expected to act upon the information. 5 4 3 2 1 10. When someone makes a mistake, I tell them not to ever do that again and make a note of it. 5 4 3 2 1 11. I want to create an environment where the employees take ownership of the project. I allow them to participate in the decision making process. 5 4 3 2 1 12. I allow my employees to determine what needs to be done and how to do it. 5 4 3 2 1 13. New hires are not allowed to make any decisions unless it is approved by me first. 5 4 3 2 1 14. I ask employees for their vision of where they see their jobs going and then use their vision where appropriate. 5 4 3 2 1 15. My workers know more about their jobs than me, so I allow them to carry out the decisions to do their job. 5 4 3 2 1 16. When something goes wrong, I tell my employees that a procedure is not working correctly and I establish a new one. 5 4 3 2 1 17. I allow my employees to set priorities with my guidance. 5 4 3 2 1 18. I delegate tasks in order to implement a new procedure or process. 5 4 3 2 1 19. I closely monitor my employees to ensure they are performing correctly. 5 4 3 2 1 20. When there are differences in role expectations, I work with them to resolve the differences. 5 4 3 2 1 21. Each is responsible for defining their job. 5 4 3 2 1 22. I like the power that my leadership position holds over subordinates. 5 4 3 2 1 23. I like to use my leadership power to help subordinates grow. 5 4 3 2 1 24. I like to share my leadership power with my subordinates. 5 4 3 2 1 25. Employees must be directed or threatened with punishment in order to get them to achieve the organizational objectives. 5 4 3 2 1 26. Employees will exercise self-direction if they are committed to the objectives. 5 4 3 2 1 27. Employees have the right to determine their own organizational objectives. 5 4 3 2 1 28. Employees seek mainly security. 5 4 3 2 1 29. Employees know how to use creativity and ingenuity to solve organizational problems. 5 4 3 2 1 30. My employees can lead themselves just as well as I can. 5 4 3 2 1 Scoring Section Put your answers on the spaces provided for every questions. Item Score Item Score Item Score 1 ______ 2 ______ 3 ______ 4 ______ 5 ______ 6 ______ 7 ______ 8 ______ 9 ______ 10 ______ 11 ______ 12 ______ 13 ______ 14 ______ 15 ______ 16 ______ 17 ______ 18 ______ 19 ______ 20 ______ 21 ______ 22 ______ 23 ______ 24 ______ 25 ______ 26 ______ 27 ______ 28 ______ 29 ______ 30 ______ TOTAL _______ TOTAL ________ TOTAL ________ Authoritarian Style Participative Style Delegative Style (autocratic) (democratic) (free reign)         References:  Covello, Joseph and Hazelgren, Brian, (1998). Your First Business Plan.Sourcesbooks 3rd Ed., Inc.USA Culp, C.(2001), The Risk Management Process: Business Strategy and Tactics, Wiley, New York, 60 -75. Gardner, Lawrence , (2006) Why businesses fail: and strategies for a successful turnaround, Detroiter, retrieved July 3, 2006, www.findarticles.com Kiyosaki, Robert T. and Lechter, Sharon L. (2002) Prophecy. Rich Dad’s.Warner Business Books, Inc. USA Spindler, A.,(1984) Publication Information: Book Title: The Politics of International Credit: Private Finance and Foreign Policy in Germany and Japan, The Brookings Institution, Washington, DC., P. 37-50. Vlieghe, G.(2001) Corporate Liquidations in the United Kingdom, Bank of England Financial Stability Review Weygandt, Jerry J., Kieso, Donald E. and Kimmel Paul D. (1998) Financial Acounting, John Wiley and son Inc. Canada Yoder James, (2004) Time diversification and changing volatility in an options pricing framework, Journal of Academy of Business and Economics  Unpublished Book: No author, (2007) My firm, Business Resource Services, has developed a process that I call Profit Mastery., At the risky end of finance Credit derivatives, Economist
Thursday, October 3, 2019
Dehydration of Alcohols Essay Example for Free
Dehydration of Alcohols Essay Abstract The dehydration of cyclohexanol to cyclohexene can be done through fractional distillation. Once the fraction has been collected it must then be dried. The dried distillate is finally tested to determine whether or not it has been dehydrated. The three tests used were infrared spectroscopy, Bromine chemical test and Bayer’s chemical test. The infrared spectroscopy showed a large narrow peak at 3062. 12(cm-1) and 3020. 71(cm-1) which indicates that there is a double bond present. To assure the results were correct the chemical tests were done. The Bromine test was found to be positive for cyclohexene. The OH group was removed from the cyclohexanol and replaced with a double bond found around 3062. 12(cm-1) and 3020. 71(cm-1) and the dehydration was successful. Introduction Fractional distillation can be used when trying to dehydrate alcohols. Dehydrating an alcohol consists of taking away an OH group. Fractional distillation separates the initial compound into separate compounds; depending on what their boiling point is. Cyclohexanol can be dehydrated to form cyclohexene. Infrared spectroscopy is used to analyze a compound and can give a breakdown of what chemicals the original mixture is composed of. An example of this is the long broad peak around 3200 (cm-1) which signifies an OH group in the compound. This technique is very useful to help determine what a compound is made of and it can also be used with NMR to give a chemical structure. Since infrared spectroscopy can be used to analyze a compound it can also be used to verify that you have the correct compound. Another way to do this is to use a chemical test. There are multiple chemical tests that can be used, one of them being the bromine test. A bromine test is used to verify whether an OH group is present or not. Another test is used with KMNO4 to test whether and alkene is present or not. Using both chemical tests and infrared spectroscopy to analyze the substance it will be clear if fractional distillation and the drying agent were able to work together in the process of dehydrating the alcohol. Materials and Methods For this experiment, 5. 0-mL of cyclohexanol were weighed and placed in a 25-mL recovery flask. A magnetic stir bar was added to the flask. 2. 5-mL of 9 M sulfuric acid was added to the same flask and mixture was swirled. The fractional distillation apparatus was set up with steel wool in the column. A 10-mL receiving flask was placed in an ice-water bath. Fractional distillation was started making sure to maintain the head temperature between 80 and 85Â °C, making sure it did not go over 90Â °C. Heating was stopped once the mixture turned dark brown and a deep green condensate formed. Distillate was then collected and transferred to a 25-mL Erlenmeyer flask. Anhydrous potassium carbonate was added with a spatula to the 25-mL Erlenmeyer flask. Flask was swirled occasionally for about 15 min while adding more anhydrous potassium carbonate until liquid no longer looked cloudy. The mixture left that was not distilled was neutralized by adding bicarbonate to the solution, slowly, until foam stops forming. Dried liquid was then transferred with a Pasteur pipet into a 10-mL recovery flask containing a stir bar for simple distillation. Another 10-mL recovery flask was used as the receiver and a calcium chloride drying tube was connected with a vacuum adaptor. The more pure compound was collected by maintaining heat from 80 to 85Â °C, making sure it did not go over 90Â °C. Distillate was weighed and percent yield of cyclohexene was determined. An infrared spectroscopy was run on the distillate by taking a drop of distillate and putting it in between two salt plates. Closed the salt plates with metal holders and then put it into the infrared spectroscopy machine. First an infrared spectroscopy was run on the cyclohexanol. Then an infrared spectroscopy was run on the cyclohexene. The Bromine chemical test was run by adding 2 drops of distillate to a test tube. 0. 1 M of bromine in dichloromethane was added to the same test tube. Then added drops of dichloromethane until color appeared if color disappeared the test would have been positive. If the color did not go away the test would have been negative. Finally a Bayer test was run by adding 2-mL of 95% ethanol to a test tube. Two drops of distillate were added to the test tube. Then KMnO4 was added drop wise until color persisted. Results Table 1. Mass of starting solution, sulfuric acid, and ending product formed. Solution| Mass (g)| Cyclohexanol| 4. 512| Sulfuric Acid| 3. 384| Cyclohexene| 1. 217| Table 2. Chemical tests done to determine whether or not the product was cyclohexene. Result seen by changes in color. Type of Test| Color of Starting Reactant| Color of Reactant plus Product| Bromine| Bromine was red| Mixture went from red to clear | Baeyer| KMnO4 was purple| Mixture went from purple to dark brown | Table 3. Infrared spectroscopy peak values representing different structures found for cyclohexanol and cyclohexene. Solution| Alcohol| Single Bonds (sp3 C-H)| Double Bonds(sp2 C=C)| Ring Structure| Cyclohexanol| Peak 13339. 25 cm-1| Peak 2-32930. 94cm-1, 2854. 63cm-1| N/A| Peak 51450. 92cm-1| Cyclohexene| N/A| Peak 8 and 112923. 83cm-1, 2658. 55cm-1| Peak 6-73062. 12cm-1, 3020. 71cm-1| Peak 281438. 15cm-1| The original weight of the cyclohexanol added was 4. 512 g. The original weight of cyclohexanol with sulfuric acid was 7. 896 g. The original weight of the sulfuric acid alone was 3. 384 g. The weight for the product, assumed to be cyclohexene, was 1. 217 g. The percent yield for cyclohexene was calculated to be 26. 97%. Cyclohexanol was distilled fractionally to produce 4-mL of cyclohexene at 88? C. The original cyclohexanol was put through infrared spectroscopy and was found to have a large broad band at 3339. 25(cm-1) indicating the presence of an OH group, large narrow bands at 2930. 94(cm-1) and 2854. 63(cm-1) indicating single bonds between carbon and hydrogen, and a large narrow band at 1450. 92(cm-1) indicating a ring. The cyclohexene was put through infrared spectroscopy which showed that there was no OH group now. This time there was a double bond between carbons at 3062. 12(cm-1) and 3020. 71(cm-1), single bonds between hydrogen and carbon at 2923. 83(cm-1) and at 2658. 55(cm-1), and a ring at 1438. 15(cm-1). The bromine chemical test gave a positive result for cyclohexene after one drop of dichloromethane was added, which changed the liquid from a red color to a clear color. The Bayer test made the substance stay purple after 1 drop showing it was negative for an alkene. Doing the bromine chemical test and the Bayer test on cyclohexanol gave negative results for both. Discussion The fractional distillation was used to dehydrate cyclohexanol collected fraction allowed it to be separated and then was dried. Only 4-mL of cyclohexene was collected from the distillation. Infrared spectroscopy was then used to determine whether the substance retrieved from the distillation was dehydrated and had turned to cyclohexene. Looking at the infrared spectroscopy of the distilled substance there was no broad peak which signifies that there is not an OH in the substance anymore and the substance is not cyclohexanol anymore. To make sure the substance was cyclohexene two different chemical tests were given. The bromine test had a positive result after 1 drop. The Bayer test had a negative result after one drop was added. There was a discrepancy between the two tests but by viewing the IR we can conclude that the substance was no longer cyclohexanol. This could be attributed to error such as the cyclohexanol not being distilled correctly, leaving impurities. The fractions may have been heated too quickly and the fractions may have mixed. There may not have been enough drying agent added to the mixture. Some future possible changes to the experiment would be to have more time to not feel rushed. This way it would be easier to heat more slowly and make sure that everything is clean leaving little to no impurities.
Introduction To Rdbms Oodbms And Ordbms Information Technology Essay
Introduction To Rdbms Oodbms And Ordbms Information Technology Essay The relational model is based on the structure of a database. A database is simply a collection of one or more relations or tables with columns and rows. The use of set theory allows for data to be structured in a series of tables that has both columns and rows. Each column corresponds to an attribute of that relation, while each row corresponds to a record that contains data values for an entity. The main elements of RDBMS are based on Ted Codds 13 rules for a relational system, the concept of relational integrity, and normalization. The three fundamentals of a relational database are that all information must be held in the form of a table, where all data are described using data values. The second fundamental is that each value found in the table columns does not repeat. The final fundamental is the use of Standard Query Language (SQL). Benefits of RDBMS are that the system is simple, flexible, and productive. Because the tables are simple, data is easier to understand and communicate with others. RDBMS are flexible because users do not have to use predefined keys to input information. Also, RDBMS are more productive because SQL is easier to learn. This allows users to spend more time inputting instead of learning. More importantly, RDBMSs biggest advantage is the ease with which users can create and access data and extend it if needed. After the original database is created, new data categories can be added without the existing application being changed. There are limitations to the relational database management system. First, relational databases do not have enough storage area to handle data such as images, digital and audio/video. The system was originally created to handle the integration of media, traditional fielded data, and templates. Another limitation of the relational database is its inadequacy to operate with languages outside of SQL. After its original development, languages such as C++ and JavaScript were formed. However, relational databases do not work efficiently with these languages. A third limitation is the requirement that information must be in tables where relationships between entities are defined by values. Today, the relational model is the dominant data model as well as the foundation for the leading DBMS products, which include IBMs DB2 family, Informix, Oracle, Sybase, Microsofts Access and SQLServer, as well as FoxBase and Paradox. RDBMS represent close to a multibillion-dollar industry alone. To combat the limitations of RDBMS and meet the challenge of the increasing rise of the Internet and the Web, programmers developed object-oriented databases in the 1980s. The main objective of Object-Oriented Database Management Systems, commonly known as OODBMS, is to provide consistent, data independent, secure, controlled and extensible data management services to support the object-oriented model. They were created to handle big and complex data that relational databases could not. There are important characteristics involved with object-oriented databases. The most important characteristic is the joining of object-oriented programming with database technology, which provides an integrated application development system. Object-oriented programming results in 4 main characteristics: inheritances, data encapsulation, object identity, and polymorphism. Inheritance allows one to develop solutions to complex problems incrementally by defining new objects in terms of previously defined objects. Data encapsulation or simply encapsulation allows the hiding of the internal state of the objects. Encapsulated objects are those objects that can only be assessed by their methods instead of their internal states. There are three types of encapsulated objects users and developers should recognize. The first is full encapsulation, in which all the operations on objects are done through message sending and method execution. The second is write encapsulation, which is where the internal state of the object is visible only for reading operations. The third is partial encapsulation, which involves allowing direct access for reading and writing for only a part of the internal state. Object identity allows objects of the database to be independent of each other. Polymorphism and dynamic binding allow one to define operations for one object and then to share the specification of the operation with other objects. This allows users and/or programmers to compose objects to provide solutions without having to write code that is specific to each object. The language important to OODBMS is data definition and manipulation language (DDML). The use of this language allows persistent data to be created, updated, deleted, or retrieved. An OODBMS needs a computational versus a relational language because it can be used to avoid impedance mismatch. DDML allows users to define a database, including creating, altering, and dropping tables and establishing constraints. DDMLs are used to maintain and query a database, including updating, inserting, modifying, and querying data. The OODBMS has many advantages and benefits. First, object-oriented is a more natural way of thinking. Second, the defined operations of these types of systems are not dependent on the particular database application running at a given moment. Third, the data types of object-oriented databases can be extended to support complex data such as images, digital and audio/video, along with other multi-media operations. Different benefits of OODBMS are its reusability, stability, and reliability. Another benefit of OODBMS is that relationships are represented explicitly, often supporting both navigational and associative access to information. This translates to improvement in data access performance versus the relational model. Another important benefit is that users are allowed to define their own methods of access to data and how it will be represented or manipulated. The most significant benefit of the OODBMS is that these databases have extended into areas not known by the RDBMS. Medicine, multimedia, and high-energy physics are just a few of the new industries relying on object-oriented databases. As with the relational database method, object-oriented databases also has disadvantages or limitations. One disadvantage of OODBMS is that it lacks a common data model. There is also no current standard, since it is still considered to be in the development stages. Object-oriented database technology is a marriage of object-oriented programming and database technologies. Figure 1 illustrates how these programming and database concepts have come together to provide what we now call object-oriented databases. Introduction to RDBMS OODBMS and ORDBMS Perhaps the most significant characteristic of object-oriented database technology is that it combines object-oriented programming with database technology to provide an integrated application development system. There are many advantages to including the definition of operations with the definition of data. First, the defined operations apply ubiquitously and are not dependent on the particular database application running at the moment. Second, the data types can be extended to support complex data such as multi-media by defining new object classes that have operations to support the new kinds of information. Other strengths of object-oriented modeling are well known. For example, inheritance allows one to develop solutions to complex problems incrementally by defining new objects in terms of previously defined objects. Polymorphism and dynamic binding allow one to define operations for one object and then to share the specification of the operation with other objects. These objects can further extend this operation to provide behaviors that are unique to those objects. Dynamic binding determines at runtime which of these operations is actually executed, depending on the class of the object requested to perform the operation. Polymorphism and dynamic binding are powerful object-oriented features that allow one to compose objects to provide solutions without having to write code that is specific to each object. All of these capabilities come together synergistically to provide significant productivity advantages to database application developers. A significant difference between object-oriented databases and relational databases is that object-oriented databases represent relationships explicitly, supporting both navigational and associative access to information. As the complexity of interrelationships between information within the database increases, so do the advantages of representing relationships explicitly. Another benefit of using explicit relationships is the improvement in data access performance over relational value-based relationships. A unique characteristic of objects is that they have an identity that is independent of the state of the object. For example, if one has a car object and we remodel the car and change its appearance, the engine, the transmission, and the tires so that it looks entirely different, it would still be recognized as the same object we had originally. Within an object-oriented database, one can always ask the question, is this the same object I had previously?, assuming one remembers the objects identity. Object-identity allows objects to be related as well as shared within a distributed computing network. All of these advantages point to the application of object-oriented databases to information management problems that are characterized by the need to manage: a large number of different data types, a large number of relationships between the objects, and objects with complex behaviors. Application areas where this kind of complexity exists includes engineering, manufacturing, simulations, office automation and large information systems. Object-Relational database (ORDBMS) is the third type of database common today. ORDBMS are systems that attempt to extend relational database systems with the functionality necessary to support a broader class of applications and, in many ways, provide a bridge between the relational and object-oriented paradigms. ORDBMS was created to handle new types of data such as audio, video, and image files that relational databases were not equipped to handle. In addition, its development was the result of increased usage of object-oriented programming languages, and a large mismatch between these and the DBMS software. One advantage of ORDBMS is that it allows organizations to continue using their existing systems, without having to make major changes. A second advantage is that it allows users and programmers to start using object-oriented systems in parallel. There are challenges in implementing an ORDBMS. The first is storage and access methods. The second is query processing, and the third is query optimization. Since the development of RDBMS, OODBMS, and ORDBMS, many vendors have extended their systems with the ability to store new data types such as images and texts, and with the ability to ask more complex queries. One rising technique is enterprise resource planning and management resource planning, which add another layer of application-oriented features on top of a DBMS. Included applications come from Baan, Oracle, SAP, and Siebel. These programs each identify a set of common tasks encountered by a large number of organizations and provide a general application layer to carry out these tasks. More importantly, DBMS have advanced into the Internet and Web Age. Stored data is widely being accessed through a Web browser. Today, queries are being generated through Web-accessible forms and answers are being formatted using a mark-up language such as HTML. In addition, many vendors and distributors are adding features to their DBMS aimed at making it better equipped for Internet usage. In summary, relational and object-oriented database systems each have certain strengths as well as certain weaknesses. In general, the weakness of one type of system tends to be strength of the other. à ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦. Object Relational Database Management System (ORDBMS) is a DBMS or Database Management System akin to a relational database, but with an object oriented database model that allows custom web development professionals to combine the database with custom data types. It bridges the gap between relational databases and Object-Oriented Database Management System (OODBMS). Traditional RDBMS (Relational Database Management System) focused on the efficient management from a limited set of data-types. Object relational DBMS allows web sites development experts to combine their own data types and methods. The limitations of RDBMS have led to the introduction of object-relational database management systems ORDBMS systems occurred in the early 1990s out of research. One of the most notable research projects, the Postgres introduced two products Illustra and Postgre SQL. The mid-1990s saw many commercial products appearing. These included Omniscience, UniSQL and Illustra 2. Objectives of Object Relational Databases: To bridge the gap between object-relational mapping and conceptual data modeling techniques. To bridge the gap between object oriented modeling techniques (used in programming languages like C++, C# and Java) and relational databases. Advantages of ORDBMS: Object Relational Database Management Systems ensures large storage capacity, which is an important part in web based development The access speed is fairly quick. ORDBMSs have massive scalability. ORDBMSs boast excellent manipulation power of object databases. Supports object functionality by adding separate APIs and server subsystems Redesigns the database engine completely Supports rich data types by adding a new object-oriented layer. Apart from these benefits, an object relational database management system has some drawbacks. One of the major disadvantages is its incapability for high-speed internet applications. However, ORDBMSs are designed to manage large amounts of information, an important aspect in the development of website. The IDC opines that the ORDBMS market has the potential to surpass the size of ODBMS in the next couple of years in web based development. Read more: http://www.articlesbase.com/programming-articles/ordbms-or-objectrelational-database-management-system-objectives-and-advantages821908.html#ixzz1CUlv7OAH Under Creative Commons License: Attribution à ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦. An object relational database is also called an object relational database management system (ORDBMS). This system simply puts an object oriented front end on a relational database (RDBMS). When applications interface to this type of database, it will normally interface as though the data is stored as objects. However the system will convert the object information into data tables with rows and colums and handle the data the same as a relational database. Likewise, when the data is retrieved, it must be reassembled from simple data into complex objects. Performance Constraints Because the ORDBMS converts data between an object oriented format and RDBMS format, speed performance of the database is degraded substantially. This is due to the additional conversion work the database must do. ORDBMS Benefits The main benefit to this type of database lies in the fact that the software to convert the object data between a RDBMS format and object database format is provided. Therefore it is not necessary for programmers to write code to convert between the two formats and database access is easy from an object oriented computer language. à ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦ To define Object-Relational Database Management System (ORDBMS) it is enough to take simple equation: ORDBMS = ODBMS + RDBMS = (O + R) * DB * MS. On a logical level, an ORDBMS is the MS process methods applied for DB data structure, which is complied with O object and R relational concepts. The R relational concept in the context of DBMS is based on the relations in the form of two-dimensional tables of rows and columns. Transformation of queries into relational algebra is the main confirmation that affiliates a database with the relational model. It is prejudice to think that SQL2 language is a single and necessary criterion of RDBMS just as to think that Java is a single language of OO programming. Noteworthy feature of RDBMS is the possibility to process a large mass of the uniform n-element tuples (rows or records) quickly. All necessary for object representation is available in the object DBMS (ODBMS). Often the ODBMS is equated to the OODBMS, namely DBMS integrated with an Object-Oriented (OO) programming language like C++ and Java. The characteristic properties of ODBMS are 1) complex data, 2) type inheritance, and 3) object behavior. These features will be considered below regarding the ORDBMS. à ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦ Complex data creation in most SQL ORDBMSs is based on preliminary schema definition via the user-defined type (UDT). The table remains a most clear form for representation of complex data in any ORDBMS. students id name course first last st031 Jane Hunter Economy Planning st072 Richard White Computers in Engineering The name attribute (or field or column) consists of the first and last attributes. The value of the course attribute is a set of Economy and Planning elements. Such structure is able, for example, for the Informix SQL (http://www-3.ibm.com/software/data/informix/pubs/library/index.html). CREATE ROW TYPE Student (  id CHAR(5),  name ROW (first VARCHAR(12), last VARCHAR(20)),  course SET (VARCHAR(128) NOT NULL) ); CREATE TABLE students OF TYPE Student; INSERT INTO students VALUES (  st031,  ROW(Jane, Hunter),  SET(Economy, Planning) ); INSERT INTO students VALUES (  st072,  ROW(Richard, White),  SET(Computers in Engineering) ); Other SQL ORDBMS suggests other composite type constructors, for example VARRAY or ARRAY instead of the SET, and OBJECT instead of the ROW. Constructors of the simple built-in types, with limitations like CHAR(5), came from SQL2. Is it necessary to define schema before filling a database? Historically, the answer was canonical yes for two reasons. Firstly, the definition of database schema essentially helped to control the type of input data. Secondly, the data type limitation made possible the early DBMSs to organize data with maximal memory and processor efficiency. Nevertheless, development of database schema is a most laborious process. There are a lot of situations related with complex data when precise schema description is not necessary or unreasonably slows project development. Furthermore, both reasons for schema predefinition are no longer valid. Control of input data should be executed by supporting an input form, (e.g., via JavaScript on the Web client side). With the hardware advances in modern database systems, the influence of data type limitation on performance is practically insignificant. à ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦ An object-oriented database management system (OODBMS), sometimes shortened to ODBMS for object database management system), is a database management system (DBMS) that supports the modelling and creation of data as objects. This includes some kind of support for classes of objects and the inheritance of class properties and methods by subclasses and their objects. There is currently no widely agreed-upon standard for what constitutes an OODBMS, and OODBMS products are considered to be still in their infancy. In the meantime, the object-relational database management system (ORDBMS), the idea that object-oriented database concepts can be superimposed on relational databases, is more commonly encountered in available products. An object-oriented database interface standard is being developed by an industry group, the Object Data Management Group (ODMG). The Object Management Group (OMG) has already standardized an object-oriented data brokering interface betwee n systems in a network. In their influential paper, The Object-Oriented Database Manifesto, Malcolm Atkinson and others define an OODBMS as follows: An object-oriented database system must satisfy two criteria: it should be a DBMS, and it should be an object-oriented system, i.e., to the extent possible, it should be consistent with the current crop of object-oriented programming languages. The first criterion translates into five features: persistence, secondary storage management, concurrency, recovery and an ad hoc query facility. The second one translates into eight features: complex objects, object identity, encapsulation, types or classes, inheritance, overriding combined with late binding, extensibility and computational completeness. à ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦.. http://www.versant.com/en_US/products/oodbms.html/ OODBMS (OBJECT DATABASE) ADVANTAGES Using an OODBMS / ODBMS (object database management system, object-oriented data management system) for data storage brings powerful advantages to applications that use complex object models, have high concurrency requirements, and large data sets. It is difficult, time consuming, expensive in development, and expensive at run time, to map the objects into a relational database and performance can suffer. Versantsobject database solutions (ODBMS) are designed to handle the navigational access, seamless data distribution, and scalability often required by these applications: Versant Object Database OODBMS (Java, C++) FastObjects .NET OODBMS (.NET) Why Versants OODBMS solutions instead of traditional RDBMS? Where data handling requirements are simple and suitable to rigid row and column structures an RDBMS might be an appropriate solutiuon. However,for many applications, todays most challenging aspect is controlling the inherent complexity of the subject matter itself the complexity must be tamed. And tamed in a way that enables continual evolution of the application as the environment and needs change. For these applications, an OODBMS is the best answer: COMPLEX (INTER-) RELATIONSHIPS If there are a lot of many-to-many relationships, tree structures or network (graph) structures then Versants OODBMS solutions will handle those relationships much faster than a relational database. COMPLEX DATA For many applications, the most challenging aspect is controlling the inherent complexity of the subject matter itself the complexity must be tamed. For these applications, a Versant OODBMS is the best answer. Architectures that mix technical needs such as persistence (and SQL) with the domain model are an invitation to disaster. Versants OODBMS solutions let you develop using objects that need only contain the domain behaviour, freeing you from persistence concerns. NO MAPPING LAYER It is difficult, time consuming, expensive in development, and expensive at run time, to map the objects into a relational database and performance can suffer. VersantsOODBMS solutions store objects as objects yes, its as easy as 1, 2, 3. Versants object database solutions are designed to store many-to-many, tree and network relationships as named bi-directional associations without having the need for JOIN tables. Hence, Versants object database solutions save programming time, and objects can be stored and retrieved faster. Modern O/R mapping tools may simplify many mapping problems, however they dont provide seamless data distribution or the performance of Versants OODBMS solutions. FAST AND EASY DEVELOPEMENT, ABILITY TO COPE WITH CONTINOUS EVOLUTION The complexity of telecommunications infrastructure, transportation networks, simulations, financial instruments and other domains must be tamed. And tamed in a way that enables continual evolution of the application as the environment and needs change. Architectures that mix technical needs such as persistence (and SQL) with the domain model are an invitation to disaster. Versants OODBMSsolutions let you develop using objects that need only contain the domain behaviour, freeing you from persistence concerns.
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