History of Database Technology and Data Models Essay Example for Free

History of Database Technology and Data Models Essay Imagine that you own bank and along with that, you own your bank’s credibility to your 100,000 clients. Just writing down each client’s information in a piece of paper would not be very secure and practical nowadays. That’s how an electronic database system comes in the picture. In this fast growing world, a technology like a database system is very necessary for establishments that hold a huge amount of data. However, the development of the current database technology and database models underwent an intricate process before it comes to a full bloom. In 1964, the word â€Å"database† technically denoted collections of data shared by end-users of time sharing computer systems and was coined by workers in a military information system. In addition, around 1960s, private companies started to own computers because of their increasing storage capabilities. Two data models were introduced: network (CODASYL) and hierarchical (IMS) model. During that time, database management systems were unsystematic. There no actual theoretical model about data organization. There was more emphasis on the processing of the records rather than the overall structure of the database system. During the 1970s, many astonishing breakthroughs on databases were witnessed. It was about the 1970 that E. F. Codd proposed a relational model for databases. The presented a system that separates the logical organization (schema) of a database from the physical storages and since that, it has been a standard in the field of computing. The term Relational Database Management System (RDBMS) was coined during this period. Theories about databases had finally made its way to the mainstream research projects. Two main prototypes for RDBMS were created: Ingres that was developed at UCB and this system used QUEL as query language and System R that was developed at IBM San Jose and this system used SEQUEL as query language. Meanwhile, in 1976, P. Chen suggested the Entity-Relationship (ER) model for database design which was proved to be vital in conceptual data models. This proposal enabled the designers to focus more on the data usage rather than its logical table structure. Commercialization of database systems for businesses began during the 1980s as demands for computers boomed. In addition, Structured Query Language (SQL) became a standard for database systems during these periods. DB2 became IBM’s flagship and development of IBM PC paved the way for more database companies and products like Dbase III and IV, Database Manager, OS/2 and Watcom SQL. The network and hierarchical models for database also started to disappear in the background. When the 1990s came, only a few surviving companies began to offer complex products at higher prices. Developments on database systems were more focused on client tool applications such as PowerBuilder (Sybase), Oracle Developer and VB (Microsoft). Some personal productivity tools related to database management were also created such as Microsoft Access and Excel. Some prototypes of Object Database Management System (ODBMS) also arose in the 1990s. It was also during the 1990s that the World Wide Web appeared. Large investments were made by Internet-related companies on Web and database connectors. Examples of these connectors are Active Server Pages (ASP), Java Servlets, JDBC, ColdFusion, Dream Weaver and Oracle Developer 2000. A solid growth of database applications was still observed in the early 21st century. Three companies continually dominate the database market: Oracle, IBM and Microsoft. In the near future, it is generally seen that databases management will be more sophisticated since huge systems (systems with storage measured in terabytes) are currently existing today. Most of these systems are used by most projects with science databases (genome projects, space exploration data). However, the â€Å"next great thing† on is the usage of XML with Java and other emerging technologies as a way to store data.

Gene Manipulation Essay -- essays research papers fc

Throughout time, man has always questioned science. Man has been curious about life, space, our bodies, and our existence. Man has gone as far as to the moon, and cloning. Everyday there are new developments being researched. Along with these developments come the people’s opinion. Many people question the positive outcomes and negative outcomes of procedures such as gene manipulation, cloning, in vitro fertilization and fetal tissue implants. To this day, scientists are researching and developing ways to â€Å"design† their children by selecting their sex, height, intelligence, and color of eyes. People question the morality of gene manipulation. Is it right to â€Å"design† our children? What are the consequences? The practice of gene manipulation is seen as Frankenstein-ish, but it is solely to benefit all humans with longer and healthier lives.   Ã‚  Ã‚  Ã‚  Ã‚  Gene manipulation is able to screen disorders of the fetus, prevent diseases from occurring to the following generations and allows parents to design their children. Prenatal testing is a very common procedure that is done . Nine out of ten pregnant women submit to some type of prenatal screening. (Golden) Dominant disorders such as Down Syndrome, which is a form of retardation, can be detected from a fetus. Since 1996, gene therapy has been the cure for patients suffering from a genetic disease. This is done by slipping a healthy gene in the cells of one organ of the patient. (Begley) Parents of this fetus can then decide on the procedures that will be done on their baby to cure him/her. Not only will the parents of the baby prepare for the surgeries but they can prepare themselves emotionally. This is helpful because during labor the parents will not be in shock when told that their child has complications. Older pregnant women who usually have more complications during pregnancy benefit from genetic screening. Doctors usually recommend â€Å"more invasive procedures† in which actual fetal cells are collected from the womb’s amniotic fluid or placenta . (Golden) Receiving the results from the tests, she can determine whether it is safe for her to continue with the pregnancy, especially since some tests provide accuracy as high as ninety-nine percent. (Golden) Unfortunately, not all test results come out positive. Approximately ninety-five percent of couples who receive â€Å"bad† news from genetic scr... ...nsequences, especially because of genetic screening. Many people may not be prepared to know nor prepared to want to know about the negative results of the tests. Should we then be ignorant about the situation and pretend not to know? Ignorance is not bliss. The more we know about curing people, the closer we get to improving our society. It may not happen now, but it will real soon. Works Cited Begley, Sharon. â€Å"Designer Babies.† Time Magazine 9 Nov 1998 Frantz, Elizabeth. â€Å"The Hunt for the Ultimate Cure.† Time Magazine 11 Jan 1999 Golden, Frederic. â€Å"Good Eggs, Bad Eggs.† Time Magazine 11 Jan 1999 Grunewald, Peter. â€Å"Genetic Engineering and Medicine.† Liebenzell: Arbeitskreis   Ã‚  Ã‚  Ã‚  Ã‚  Furernahrungs forschung 1994. Joyce, Christopher. â€Å"Special Delivery†. USA Weekend 14-16 May 1999 Kalb, Claudia. â€Å"Our Quest to Be Perfect†. Newsweek 9 Aug 1999 Lemonick, Michael. â€Å"Designer Babies† Time Magazine 1999 â€Å"Prenatal Care† http:w-cpc.org./pregnancy/testing.html. Toriello, Helga, Ph.D. â€Å"It Happened Once-Will It Happen Again?† A Heartbreaking   Ã‚  Ã‚  Ã‚  Ã‚  Choice Fall 1994 Wright, Robert. â€Å"Who Gets The Good Genes?† Time Magazine 11 Jan 1999

Managerial Accounting Case Essay

In the Seligram case, the existing cost accounting system measured two components of cost: direct labor and burden. All burden cost, which is the overhead, was grouped into a single cost pool and was calculated only by using a burden rate per direct labor dollar. This may cause problems since direct labor and overhead are not consumed by the products in the same proportion. Simply using the same burden rate is obsolescent. First of all, direct labor hours per lot tested had been steadily declining, especially with the increase of dependence on vendor certification. This will result in the change of the burden rate. Besides, this system distorts the price to some extent, making the price for complex parts cheaper while price for elementary testing higher compared with price for outside services. What is more, the consequences brought from the introduction of high -technology components would decrease the direct labor hour. All of this was trending to higher burden rates and overall hi gher rates. Cost allocation based on current burden rate of 145% is calculated within the Exhibit1. Having noticed of the problems of the existing system, the accounting manager proposed a two-burden-pool method to allocate the burden cost. Under the two-burden-pool method, burden cost has been divided into two pools: one is the burden cost related to the administrative and technical functions and the other is test related burden. The former is calculated based on direct labor dollar, the latter one is calculated by using machine hours. This method takes other factors that cause the burden into account, which makes the cost allocation more accurate than the existing method. The result of two-burden-pool is as the follows. The consultant proposed a more detailed cost allocation method, i.e. separate burden centers from each of each test room and common technical and administrative pool so that a three-burden-pool is formed. Under this method, burden cost in test rooms would be allocated on a machine-hour basis, and technical and administrative costs would continue to be charged on a rate per direct labor dollar. This method is more accurate in allocating the burden cost by providing a cost of each product or job. Through this way, ETO could differentiate client and product and calculate the cost more accurately from direct data such as the machine hour to product a certain product, so that they need not to guess the real cost of that product by allocating cost according to estimation. Besides, due the process of automatic, direct labor dollar amount alone could not reflect the real picture of burden cost as before. So it is necessary to take other related factor into account when allocating burden cost and more detailed analysis of the allocation basis is needed. The allocation result of three-burden-pool is listed below: Since the three-burden-pool system is most accurate in allocating burden cost among those three methods, it is preferable. However, it does not mean the three-burden-pool system is perfect. Because this system provides more accurate and detailed information of the production process, it will cost more than the other two methods. In addition, the redesign of the three-burden-pool system could be expensive too due to the complexity of the system. In order to improve this system, ETO needs to pay attention of the relationship of cost and benefit. Besides, ETO could set up a system that is easy and effective to perform to save the cost of implicating three-burden-pool. Besides the consideration of proposed cost allocation methods, Seligram should also arrange the new equipment into an appropriate cost pool which indicates a more reliable estimation. Assuming that new equipment has a separate cost center, all variable cost, fixed cost and depreciation will be reported separately. The burden rate is only based on the machine hours of new equipment which are 400hr (Year1) and 2400hr (Year2-8). Additionally, we use Double-decline method for depreciation. Balance is shown in Exhibit4. The separate burden rate for Year 1 would be much higher than those in the following years due to set up costs (Exhibit 5). Burden rates combined with main testing room are calculated in Exhibit 6. All combined burden rates are much lower than the separate costing rates. We recommend choosing a separate cost center for new equipment, even though the rates are much higher. Due to the current situation that lower costs for more complex components, which is abnormal, separate method would reflect more accurate and reliable costs of new imported machines. Obviously, combined method would influence the presentation of true costs. The costs are reduced by other factors in main testing room. Higher burden rates are more reasonable that these new machines have higher cost in essence and also they are just for testing components from several specific clients. Higher burden rates are more accurate.

Essay On False Memory - 1409 Words

False Memories are fundamentally, unintended human errors, which results in people having memories of events and situations that did not actually occur. It’s worth noting that in humans there are both true and false memories, these false memories occur when a mental experience is incorrectly taken to be a representation of a past event. For example, when people are asked to describe something that happened at a particular time, people rarely deliver accurate answers. Based on research, in eyewitness testimony, the confidence people show while recalling a memory is not an accurate representation of the truth. In simpler terms, is that when people tried to recall who the murder was, they did not actually point to the right one, people†¦show more content†¦The materials used for the experiment was a website called Coglab: The online cognition lab. The scores were conducted simply by using the website and doing the â€Å"False Memory† lab and a computer. Participan ts were asked to read the instructions in the Coglab website. Procedure The experiment consisted of 6 trials that contained words such as: sleep, bed, tired etc. The participants were asked to look at the rectangle on the screen before starting the trials. In the first trial, the participants were asked to press the â€Å"start trial† button because a fixation dot would appear in the middle of the screen. The participants were asked to stare at the computer until a sequence of words appeared, with each word was presented for one second. After a full sequence was presented, a set of buttons were shown, each labeled with a word. Some the words were on the list, and some were not. The participant’s task was to click or tap on the buttons to indicate which words were in the sequence. The sequence of words consisted of the actual words shown or related or unrelated words. For example, some trials consisted of all sleep related content to see if the participant would select items that were related or select items that were not in the sequence. After identifying the words that were shown in the sequence, they would receive feedback on the accuracy of their memory. After the participants were doneShow MoreRelatedEssay False Memory1199 Words   |  5 PagesMemory is one of the most critical parts of cognition. It is important because it is involved in almost every aspect of cognition including problem solving, decision making, attention, and perception. Because of this importance, people rely on one’s memory to make important decisions. The value of one’s memory in this society is so high that it is used as evidence to either save one’s life or kill one’s life during murder trials. But as many of the cognitive psychologists know, human’s memory canRead MoreFalse Memory Essay1208 Words   |  5 Pagespopulation have claimed that they remember a memory that never actually happened, which can also be perceived as false memory. (HealthDay News, 2016). According to Time magazine, a false memo ry is when you have an apparent recollection of an event that actually never occurred. It might be easy to explain why we remember things, however psychologists are finding that it’s trickier when we claim we remember things but it simply never happened. False memories are something you want to get more knowledgeRead MoreFalse Memory Essay609 Words   |  3 PagesFalse Memory Cognitive Psychology In false memory experiments, special distractors are variables that are included in a list of the experiment intending to distract the participant. In the false memory experiments there is usually a related distractor and an unrelated distractor (Arnold 2002). The subject is presented with a list of words , directly after the list disappears the subject is shown another list containing original words, related distractor words, and unrelated distractor words;Read MoreFalse Memory Essay1786 Words   |  8 PagesFalse memory, second to forgetting, is one of the two fundamental types of deformation in episodic memory (Holliday, Brainerd Reyna, 2010). Simply stated, false memory is the propensity to account normal occurrences as being a fraction of a key experience that in actuality was not an element of that experience (Holliday, Brainerd Reyna). False memories are something nearly everyone experience. Furthermore, false memory is defined as placed together, constructed represent ations of mental schemasRead More False Memory Syndrome Essay1391 Words   |  6 PagesFalse Memory Syndrome How accurate and reliable is memory? Studies on memory have shown that we often construct our memories after the fact, that we are susceptible to suggestions from others that will help us fill in the gaps in our memories (Carroll 6). Prior to reading and discussing the issue of False Memory Syndrome, I hadn’t thought much about the topic. Maybe a person who had experienced this would be more educated. I did however find it very interesting to research and my beliefsRead MoreMisinformation and False Memory Essay624 Words   |  3 PagesIn class this week we saw cases where our memory fails when recalling information in the past and even seeing changes in real time in front of our eyes. Misinformation is when someone gives information that is incorrect without the intent of giving the incorrect information. This is more likely to happen in situations where the new information would fit someone’s schema of the situation. In a crime example, we can say that a robber has a knife in his hand and pointed it at someone, someone in theRead MoreEssay on The False Memory Task712 Words   |  3 PagesThe False Memory Task begins by giving examples of how memory of events can be incorrect, although we might not be aware of it. The goal of this task is to clearly show how easy it is for our memories to have false information. We are often convinced that our memories are correct, especially when they seem to be logical and contain a lot of detail. However, errors in memory are easily made and far more frequent than the majority of people realize. This ZAPS experiment approaches false memory errorsRead MoreFalse Memory Eyewitness Testimony Essay1590 Words   |  7 PagesFalse Memory and Eyewitness Testimony PSY363 False Memory and Eyewitness Testimony A false memory is simply a memory that did not occur. An actual experience can become distorted as best illustrated by the Cog Lab experiment on false memories accessed through Argosy University. The experiment is outlined as follows: a participant is given a list of words that are highly relative in nature at a rate of about one word every 2 seconds. At the finish of the given list, the participantRead MoreWhat is False Memory Syndrome? Essay789 Words   |  4 Pages False memory syndrome is also called Recovered memory, Pseudo-Memory, and Memory Distortion. False memory syndrome or pseudo-memory is memories of an experience, in which one seemingly remembers that never actually or really occurred. In other words, false memory is a fabricated remembrance of past events that did not really happen. People often falsely thought of memories as recorder that are records accurately of all the experience in our brain but, memories are not always true and accurate andRead MoreEffec ts of False Memories Essay examples1753 Words   |  8 PagesFalse memories have been the subject of many studies since Deese (1959) investigated their effects. False memories include distorting features of events and situations or recalling facts and memories that never occurred at all (Roediger and McDermott, 1995). Roediger and McDermott’ (1995), experiment based on Deese’s (1959) experiment renewed the interest in false memories and invented the Deese-McDermott-Roediger Paradigm which many studies surround. Their study focused on eliciting false memories