Polynomial Matrix Decompositions

Polynomial Matrix Decompositions The interest and dramatic increase in demand for high-speed data transmission has exploded since the introduction of triple play multimedia services. One of the pioneering contributions is the increasingly higher data rates achievable through the use of multiple-input multiple output (MIMO) channels. A further increase in data rates is possible through a well-coordinated multiple channels. Precoding and equalization transmission blocks represent a typical coordinated strategy that enhance the channel capacity of a deterministic narrowband MIMO channel. This strategy can be derived by performing a singular value decomposition (SVD) of a channel matrix. These blocks allow a MIMO channel matrix to solve a host of special multicarrier problems using the orthogonal property of the system. It can also be exploited to approximate low-rank channel matrix by reducing the dimensionality of high-dimensional data sets. The technique referred to here as an orthogonal spatial multiplexing (OSM) method. OSM allows multiple users to use a given bandwidth simultaneously by dividing the available channel into multiple narrow orthogonal bands that are spectrally spaced. Each band is then divided into numerous subcarriers, which are structures so as not to interfere with one another. The transmit signal is then modulated onto these subcarriers. The technique exploits physical separation methods that permit the sharing of channel resources simultaneously.   Every users becomes spatially spaced far enough from each other to counteract interference.   In addition to spacing, dual polarizations are introduced to further avoid interference. When signalling over MIMO channels using an orthogonal spatial multiplexing, an SVD can be used to derive every sub-carrier/tone. In the traditional method, an increase in the number of tones also increase the complex computational load.   It is therefore the focus of this study to investigate an alternative means for obtaining an efficient decomposition. A MIMO channel can be modelled as a weighted sum of the past and present samples of transmit data. The channel considers a finite impulse response (FIR) filters that can be represented by a covariance matrix whose elements are polynomials. This study focuses on investigating algorithms that decompose the covariance matrix directly. Approximation factors can then be introduced to obtain the Precoding and equalization transmission blocks. Existing polynomial singular value decomposition algorithm is used and studied in the context of channel quality and computational complexity settings. The decomposition algorithms were shown to give decompositions of good channel quality, but if the goal is to obtain Precoding and equalization transmission blocks, the computational load is restricted with higher multidimensional channels. An algorithm for approximating direct decomposition of covariance matrices is investigated. Although we discuss simple cases resulted in excellent decompositions but analyse with numerical stability of a spectral factorization steps for large-case decompositions. For high frequency selective MIMO channels, the performance achieved by utilizing the polynomial SVD algorithm were compared to the channel capacity. It was shown that if the transmit sequences are approximated individually at the receiver, as done in the traditional approach, the performance more likely to be sensitive to errors in the decomposition. An equalizer with a spatially joint detector seems promising to achieve a better performance close to the single-user transmission. With such an equalizer, the low complexity property of the traditional approach is compromised with performance. Summarizing, this study has shown that a MIMO channel can be diagonalized in space and frequency using spatial multiplexing method in conjunction with a polynomial SVD algorithm. In order to reach better performance close to the achivable of a single-user, the computational load becomes restraining compared to the traditional approach, for channels with higher multidirectional channels.

My Town :: essays papers

My Town To give you a better view of "My Town," I will perch him atop the highest point of the some-kind-of-wonderful city of Hillside: The Giza pyramid-shaped pile of garbage majestically sitting in the town dump. The movie theater is to the west; a neon-pink fluorescent sign frames this week's shows: Th' Bach, Scram 3, and y' of Th' Bholdr. Teenage employees relinquish all responsibility for the missing "E"s. A makeshift lemonade stand is set up a block away. Sometimes, its determined entrepreneurs, the set of five-year-old twins, Brooke and Blake Simone like to mix their drink of choice with "extra flavoring," such as leaves, rocks, and the occasionally, yet classic family of ants. Needless to say, the single dime in their yellow Teletubbie cash box has not multiplied since their first day of business. The strip mall to the north has been replaced by Car Max, the automobile superstore. Unfortunately, the abundance of cars has not, in fact, improved anyone's driving skills, or lack of them. Further west is Proviso West High School; the peeling, forest-green painted fence that protects the school grounds failed to prevent kleptomaniacs from stealing seven car stereos from the parking lot last December. The football field behind the school patiently waits with its freshly mowed green splendor for the team of big, burly boys (and one girl) to actually win a game. At 5:30 AM, a shivering Student Council vice-president with the intent to do extra work trudges the perimeter of the edifice, praying for an open door to a building that doesn't like to be occupied outside of the normal school hours. Psychologically, two opposing beliefs surface for why I dream of dancing sugarplums and college diplomas rather than a pin on my Dairy Queen hat that reads "Employee of the Month." A child is either influenced by his surroundings and peers or repelled into the opposite direction. As a magnet gone a rye, I am thankful that Hillside has not influenced me to blend in with the crowd; neither the cemetery across the street from school nor the various monument and flower shops entice me to- pardon my morbidity- just drop dead. The strategically located bowling alley down the block does not tempt me to ditch school. Certainly, the smell of the garbage dump has turned me off to the wide-eyed world of garbage disposal and handicapped my nose, thus threatening me into giving a hoot.

Brazil Macroeconomics Essay

The country of choice is Brazil for the following reasons: it is a booming economy, which provides some stark contrast with the stagnation and ever-mentioned phrase ‘double-dip recession’ which now commonly used in the West. Macroeconomics is concerned with the study of aggregate economy, which embodies all nationally relevant economic indicators. The common indicators are the unemployment rate, the rate of inflation, the GDP per capita, economic growth, the economic cycle, and the labor force. Since 2003, Brazil’s economy has been growing steadily. It has been improving its macroeconomic stability despite a small crisis in 2008 which saw its growth rate decline to 2.6%. In 2010 it grew by 7.6% amid renewed confidence from foreign investors. Part of the reason for this is the high interest rates which make it attractive to foreign investors. Note also that this was its highest growth in 25 years, whilst people especially given that many economies were struggling a t the same time. Furthermore, the continuing flows of investment into the manufacturing sector have provided greater backbone to the economy. Note that a commonly cited reason for the economic struggle of the UK for example is its everlasting trading deficit. It does not export enough, it does not manufacture enough. With natural resources such as tin, clay, uranium, platinum, petroleum, cocoa, gold, wood, and hydroelectric power (and much more), Brazil is generally recognized as one of the naturally richest countries on Earth in terms of quantity and probably the richest in terms of variety of resources. The subject being treated here is not a comparative analysis between Brazil, an emerging economy and the declining economies of the West. Comparative analysis will only be used briefly in order to further confirm the great performance of this economy since 2003. In the arena of macroeconomics, it is essential to look at things from a national and international standpoint and therefore the performance of one economy is not only relative to its past performance but also relative to other economies in the world. In the past decade Brazil’s Government has combined fiscal policy has been used at times to stave off excessive inflation and encourage consumption. The reason why this has worked out is that in the long-run, the country has consistently been creating jobs both in the manufacturing and the services sectors, which in unison with fiscal policy have helped keep a lid on inflation in the past ten years. This point of success will be analyzed inn depth given that this country was previously known to have huge inflationary problems prior to the last decade. http://www.bbc.co.uk http://www.indexmundi.com/brazil/economy_profile.html http://www.thomaswhite.com/explore-the-world/brazil.aspx

Role of Knowledge Management in Improving Performance of Operations Departments

Role of Knowledge Management in Improving Performance of Operations Departments Introduction Knowledge is arguably the most important asset an organization has. Its good management is crucial if the organization is to succeed in a competitive environment. In the past, many organizations did not recognize this and few resources were dedicated to managing the knowledge that the organizations had.Advertising We will write a custom research paper sample on Role of Knowledge Management in Improving Performance of Operations Departments specifically for you for only $16.05 $11/page Learn More However, this has changed in the course of the last decade and knowledge management (KM) has emerged as an important field that provides the rationale for managing knowledge in order to achieve the increased productivity of the organization. Baskerville and Alina (2006) note that knowledge management has become such an important concept that many executives today characterize their most important task as leveraging organizational knowledge (p.83). It has been recognized the KM plays a crucial role in the accomplishment of organizational goals and KM has therefore become one of the necessary tools for modern organizations. Against this background, this paper will set out to discuss the role that knowledge management plays in improving the performance of operations departments of an organization. The paper will demonstrate how KM strategies can help an organization to improve its performance and therefore remain competitive. Overview of Knowledge Management Knowledge is a justified personal belief and it is a mix of framed experiences, values, contextual information, and expert insights. It provides the framework through which new information or experience is evaluated or incorporated. Knowledge is a very important and strategic resource for an organization. However, it can only be utilized properly if an organization makes an effort to discovery patterns and rules where knowledge works. This can only be achieved through the proper m anagement of the knowledge; a task that is essential for a business to improve its efficiency and effectiveness in delivering of services and goods to its clients. Knowledge management is defined by King (2009, p.4) as the planning, organizing, motivating, and controlling of people, processes and systems in the organization to ensure that its knowledge-related assets are improved and effectively employed. KM aims to increase competition between organizations and increase the level of effective decision making. Management of the knowledge base is a very important issue and King (2009) proposes that for KM to be optimal, a large number of employees should be relied upon to contribute their knowledge. Relying on specialists to enter and manage the knowledge base greatly limits the effectiveness of KM Systems. Role of KM in Performance Improvement KM helps the organization to identify the factors which lead to superior performance and capitalize or make further improvements on these asp ects. Baskerville and Alina (2006) state that for many organizations, these factors include: organizational creativity, high quality of products and services offered by the organization, and enhanced effectiveness of operations.Advertising Looking for research paper on business economics? Let's see if we can help you! Get your first paper with 15% OFF Learn More The operations department can use KM to identify these factors and once this has been done, the department is able to make improvements on them and hence increase its productivity. KM plays a very important role in enabling the department to make the best use of organizational knowledge. This kind of knowledge is very beneficial since most of it is laboriously developed over a long duration of time through the trial and error method. Baskerville and Alina (2006) state that most organizations fail to make good use of this knowledge because they lack KM systems and therefore, the organization does not know what it knows. Decision making is one of the most important roles of management in any organization. The quality of decisions made often determines the future success of a business and with this consideration, many organization invest resources in measures to assist in the decision making process. KM plays a very major role in the decision making process of operations departments (King 2009). Normally, knowledge has a more critical function in decision making process than resource and data. KM helps to sort the knowledge and define it as accurate and non-accurate knowledge. The managers are then able to make the best decision since they can identify the contexts where the knowledge works by using KM. Increased productivity is a core goal for all organizations and for this to be achieved; the performance of each employee has to be optimal. KM assists in increasing employee performance since it increases the interaction between co-workers. There is therefore a higher level of kno wledge sharing among employees and this increases the chances of organizational goals being met. Employees are able to keep track of projects in progress and easily obtain the assistance of their peers though KM. As has been noted, the productivity of the operations department depends on the ability of the individuals who make up the departmental team. Therefore, the productivity of the department is dependent on the skills possessed by the employees. When some employees lack proper skills, the total output of the entire department is reduced. KM assists in ensuring that all employees possess the desired level of skills. This is achieved since KM assists in the sharing of knowledge between employees and at the same time the prevention of non-educated employees (Baskerville Alina 2006).Advertising We will write a custom research paper sample on Role of Knowledge Management in Improving Performance of Operations Departments specifically for you for only $16.05 $11/page Learn More In an increasingly competitive market, innovation and creativity have become the defining characteristics of successful organizations. Big profitable organizations such as Microsoft and Wal-Mart are continuously looking for new ideas and innovations in order to stay ahead of their competition. Innovation has today become paramount to the growth of a company and in most cases it comes from individuals in the company. This innovation can then be utilized to advance the goals and objectives of an organization. Skinner (2007) asserts that the presence of innovation alone is not good enough; innovations must be disseminated and reach’ target users for uptake and utilization to be possible (p.53). KM assists in the innovation process of the department in a number of ways. To begin with, it increases knowledge sharing among employees which results in the generation of new ideas and innovations by the employees. KM also captures the reasons behind the adoption of disseminated innovation and the practitioners are therefore made aware of new innovations and the relative advantages that they offer. Skinner (2007) reveals that previous experiences as articulated in the KM system will inform users current practices. In addition to this, they will integrate their existing knowledge as they adopt and implement new innovations. Many organizations are faced with the need to improve their organizational performance so that they can acquire greater benefits and better cope with the changes they constantly face. A chief consideration in KM is that the best outcomes can be achieved if the organization is engaged in a continuous learning process. This means that the efficiency and effectiveness of the operations department can only be guaranteed if the members of the department are willing to learn before, during and after activities. Chen and An-Pin (2006) suggests that KM enhances the learning process of the individual through the provision of the ne cessary information. It then focuses on knowledge flows and the process of creation, organization, and retrieval of knowledge. The capability of workers is enhanced since their core competencies are supported by KM. By using staff knowledge, the department is able to improve its processes and therefore operate in the most efficient and effective way. Businesses are constantly seeking ways to decrease their operational costs and therefore increase their profit margins. KM offers a good way of achieving this by helping to get rid of some of the activities that previously cost the organization. Some KM systems automate tasks previously performed manually such as the training of new staff members therefore decreasing the costs associated with such actions (Chen An-Pin 2006).Advertising Looking for research paper on business economics? Let's see if we can help you! Get your first paper with 15% OFF Learn More In a company that has a high number of new employees either due to high rate of employee turnover or business growth that necessitates hiring new employees, such a KM assists greatly in keeping training costs manageable. The KM also makes sure that knowledge transfer takes place in a seamless manner and the new employees are able to gain the necessary knowledge to work efficiently in the shortest time possible. Profitable growth strategies can only be achieved by understanding the needs of the customers and responding appropriately to them. Many organizations therefore invest significant resources in an attempt to increase the knowledge of their managers on the key drivers of customer satisfaction. Chen and An-Pin (2006) highlights that when business leaders have an expanded knowledge of the key drivers of customer satisfaction and business process excellence, the can engage in strategies that expand their consumer base and hence increase the companys profitability. The relationship that the organization has with its customer base is also important and organizations seek ways to improve these relations. KM helps to achieve these goals by assisting in the development of customer relationships and therefore increasing shareholder equity. A common reality for most organization is that key staff can leave at any time. The loss of such key personnel is normally accompanied by a loss of knowledge which is of critical use to the organization. Shaw and Baker (2003) states that this knowledge erosion which is caused by people leaving the organization or even changing jobs within it can be damaging to the organization since knowledge plays a crucial role in decision making and running the organization. KM can help deal with this by enabling a department to have a memory that goes beyond the people in it. This knowledge is archived and remains with the specific department even if the key staff is lost. Discussion While many organizations acknowledge the importance of KM, many of them do not know how to go about implementing it. Razi and Abdul-Karim (2010) reveal that contemporary organizations have spent billions of dollars in the implementation of KM and from this, only marginal improvements have been attained with failure rates at the implementation stage ranging up to 70%. The risks of failure during KM implementations are therefore high and if an organization is to reap the benefits of KM, ways of mitigating these risks need to be looked at. Research indicates that there is a relationship between workers and successful KM implementation and as such, organizations need to determine the individual members responsible for KM implementation. These members are responsible for the creation, promotion and identification of knowledge in the organization and their role in KM is crucial. Having a KM system in place is a good move but it is not enough; there also needs to be a metric for measuring the relative success of KM strategies. Chen (2008) suggest s that performance evaluation should be an integral part of the KM plan of any company. Such performance evaluation will help the department to better understand its KM level and offer a basis to improve its KM. Conclusion Knowledge management has emerged as a potent way of increasing the efficiency of an organization. It helps organizations to accomplish their objectives and remain profitable in an increasingly competitive market. This paper set out to discuss the role that knowledge management plays in improving the performance of operations departments in an organization. The paper began by describing what KM is and its relative significance in organizational growth. The paper has demonstrated how a lack of KM can seriously hinder operational departments. It has revealed that for knowledge to be of optimal use, it has to be shared among various parties in the organization. The development of skills and professional qualification in the companys staff can also be assisted by KM. W hile some organizations may have questions as to whether it is worthwhile to invest in KM, this paper has demonstrated that here are numerous benefits that the operations department can get from KM implementation. References Baskerville, R Alina, D 2006, â€Å"The theoretical foundations of knowledge management†, Knowledge Management Research Practice, 4(1): 83–105. Chen, M An-Pin, C 2006, â€Å"Knowledge management performance evaluation: a decade review from 1995 to 2004†, Journal of Information Science, 32 (1): 17–38. King, WR 2009, Knowledge Management and Organizational Learning, Springer, Boston. Chen, R 2008, An Evaluation Method for Enterprise Knowledge Management Performance Based on Linguistic Variable, International Seminar on Business and Information Management, Shandong, China Razi, M Abdul-Karim, N 2010, An Instrument to Assess Organizational Readiness to Implement Knowledge Management Process, Proceedings Knowledge Management 5th Intern ational Conference, Georgia. Shaw, D Baker, B 2003, â€Å"Achieving closure through knowledge management strategy. Electronic Journal on Knowledge Management, 1(2): 197-204. Skinner, K 2007, â€Å"Developing a tool to measure knowledge exchange outcomes†, The Canadian Journal of Program Evaluation, 22(1): 49–73.

Tip-Of-The-Tongue (TOT) Phenomenon

Tip-Of-The-Tongue (TOT) Phenomenon In psycholinguistics, the tip-of-the-tongue phenomenon is that feeling that a name, word, or phrase- though momentarily unrecallable- is known and will soon be recalled. According to linguist  George Yule, the  tip-of-the-tongue phenomenon  mainly occurs with uncommon words and names. [S]peakers generally have an accurate phonological outline of the word, can get the initial sound correct and mostly know the number of syllables in the word (The Study of Language, 2014). Examples and Observations: Whats the name of that stuff I wanted to tell your mother to use?Wait a second. I know.Its on the tip of my tongue, she said.Wait a second. I know.You know the stuff I mean.The sleep stuff or the indigestion?Its on the tip of my tongue.Wait a second. Wait a second. I know.(Don DeLillo, Underworld. Scribner, 1997)You know, the actor guy! Oh, what is his name? See, the thing is, the thing is, the thing is that when I say his name, youll go, Yes! The actor guy, love him, adore him . . .. But I cant think of his name. Its on the tip of my tongue. You know who I mean. Hes got the hair, the eyes, a bit of a nose, and a mouth, and its all held together with, like, a face! (Frank Woodley, The Adventures of Lano Woodley, 1997)The tip-of-the-tongue phenomenon (henceforth, TOT) straddles the line between what we think of as memory and what we think of as language, two closely related cognitive domains that have been studied somewhat independently of each other. . . . The implications of whethe r TOT is memory-related or language-related has different implications. Consider the following example. Political pundits used to make fun of former President George H. Bush because of his frequent word-finding failures. Despite his obvious depth of knowledge and expertise, his speech was sometimes characterized by pauses suggesting a failure to recall a known word. His deficit was usually attributed to absent-mindedness, rather than a lack of clear thinking. In other words, it was dismissed as a language-production failure, not a more consequential memory failure. His son, President George W. Bush, suffers from a similar affliction. However, the sons speech errors (e.g., Kosovarians, subliminable) are often interpreted as a lack of knowledge, and therefore, a learning deficit; a more consequential one for a president. (Bennett L. Schwartz, Tip-of-the-Tongue States: Phenomenology, Mechanism, and Lexical Retrieval. Routledge, 2002) The TOT state demonstrates that it is possible to hold the meaning of a word in ones mind without necessarily being able to retrieve its form. This has suggested to commentators that a lexical entry falls into two distinct parts, one relating to form and one to meaning, and that one may be accessed without the other. In assembling speech, we first identify a given word by some kind of abstract meaning code and only later insert its actual phonological form into the utterance we are planning. (John Field, Psycholinguistics: The Key Concepts. Routledge, 2004) Also Known As: TOT Also see: Bathtub EffectMemorySlip of the TongueWhat Are Placeholders in English?

Project Research Paper Example | Topics and Well Written Essays - 1000 words - 1

Project - Research Paper Example According to Miles (2008), it involves active acquisition of material items and purchase of services for convenient purposes. This aspect is economic in nature because in entails exercising one’s economic power in purchasing goods and services. On the other hand, consumerism possesses sociological attributes because it serves as a measure of elite lifestyle and social status. Poor members of the society purchase only the basic needs. However, consumerism involves mass acquisition and consumption in excess of one’s basic needs. According to Stearns (2006), consumerism derives its origin from industrial revolution in the Western world. Prior to industrial revolution, resources and goods were scarce, and acquisition of these items was invariably restricted by the scarcity. However, industrial revolution led to massive production of material items and services. As a result of surplus in production, Western societies adopted an economic behavior characterized by massive purc hase and consumption of goods as a show of social and economic strength. Consequently, proliferation of industrialization spread consumerism behaviors to other parts of the world including the Middle East and Asia. In modern commercial settings, consumerism is commonly referred to as consumer culture or market culture. As opposed to its earlier principles of mass consumption, current consumerism entails a close association between brand items and owners. According to Campbell (2005), American markets indicate a tendency for people to elicit strong attraction towards items as symbol of economic and social status. Purchase of brand and expensive automobiles and jewelry satisfies consumerism aspects members within America society. Apart from the US markets, other commercial environments across the world use goods and services as a measure of socioeconomic status of individuals. According to Campbell (2005), this has led to a situation whereby social stratification based on economic str ength has induced irresponsible production and consumption of goods and services. Consequently, irresponsible production presents adverse effects on environment and resource base. Problems of Consumerism Since inception of consumerism as a socioeconomic culture, there have been numerous criticisms on this aspect. Stearns (2006) says that as earlier as during the 20th Century, religious leaders in Europe including Pope Benedict 5 were opposed to the manner in which people were using economic power as a measure of social status. Currently, consumerism has been associated with a myriad of problems which include environmental pollution, depletion of resources, increase in social inequality, disruption of economy and increase in social deviance. With respect to social deviance, people are trying to acquire wealth and resources in an effort to increase their economic

Texts 2 Essay Example | Topics and Well Written Essays - 2250 words

Texts 2 - Essay Example The model somehow mixes the inner and outer sings as well as many disciplines which can be seen by explaining that sociology, psychology and economics are major disciplines whereas parks and recreation, agriculture and transport are not the fields of study but are included as major disciplines in the model. The model actually is a puzzle between major and minor disciplines (Tribe, 1999) Also, we can say that marketing and business represent themselves as a problem. Marketing in general is considered a business function, it uses principles and guidelines from sociology and psychology as well as uses some of the business principles. Marketing is studied as a sub major in business and also, law is included in the business studies. So we can include these two as sub majors in the major discipline of business. "techniques required in business studies are derivative partly from the disciplines that contribute to them and partly from the world of business practice." Henkel’s analysis clearly explains aforementioned theories and states that in an alternate form that the validation of a part of its knowledge is outside of its academy (tribe, 1999). Tourism and business studies are the two emerging fields of studies and both of these fields collide or cooperate with each other in one way or the other. Hence, Tribe forces on the fact that there needs to be a new formulation of re interpretation of the model presented by Ritchie and Jafari since we need to incorporate business and marketing in the their model.Accommodating all the disciplines and departments under one heading of tourism studies is rather confusing and very difficult. We can say that we now need to divide the field of tourism studies into multiple fields, at least two and one of these two fields can be called tourism business studies whereas rest are still to be identified or incorporated into other fields of tourism studies. A tourism business study is a field of study mainly inspired from business