Wednesday, April 29, 2009

Ergonomics

Ergonomics is the science of designing the job, equipment, and workplace to fit the worker. Proper ergonomic design is necessary to prevent repetitive strain injuries, which can develop over time and can lead to long-term disability.[1]

Ergonomics is the scientific discipline concerned with designing according to human needs, and the profession that applies theory, principles, data and methods to design in order to optimize human well-being and overall system performance. [2] The field is also called human engineering, and human factors.

Ergonomic research is performed by those who study human capabilities in relationship to their work demands. Information derived from these studies contributes to the design and evaluation of tasks, jobs, products, environments and systems in order to make them compatible with the needs, abilities and limitations of people.[3]

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World-systems approach

The World-systems approach is a post-Marxist view of world affairs, one of several historical and current applications of Marxism to international relations.

One of the basics of the approach is its view of imperialism, which for many Marxists during the 20th century represented "the highest stage of capitalism", a term coined by Vladimir Lenin, who also used the terms periphery and core as a means to analyze world politics and economy.

Immanuel Wallerstein, a leading advocate of the approach, uses the same terminology. He characterizes the world system as a set of mechanisms which redistributes resources from the periphery to the core. In his terminology, the core is the developed, industrialized, democratic part of the world, and the periphery is the underdeveloped, raw materials-exporting, poor part of the world; the market being the means by which the core exploits the periphery.

Wallerstein traces the origin of today's world-system to the 16th century in Western Europe, and defines it as:

"...a social system, one that has boundaries, structures, member groups, rules of legitimation, and coherence. Its life is made up of the conflicting forces which hold it together by tension and tear it apart as each group seeks eternally to remold it to its advantage. It has the characteristics of an organism, in that it has a life-span over which its characteristics change in some respects and remain stable in others. One can define its structures as being at different times strong or weak in terms of the internal logic of its functioning."[1]

Apart of these, Wallerstein defines four temporal features of that. Cyclical rhythms represent the short-term fluctuation of economy, while secular trends mean deeper long run tendencies, such as general economic growth or decline. In the theory the term contradiction means a general controversy in the system, usually concerning some short-run vs. long run trade-offs. For example the problem of underconsumption, wherein the drive-down of wages increases the profit for the capitalists on the short-run, but considering the long run, the decreasing of wages may have a crucially harmful effect by reducing the demand for the product. The last temporal feature is the crisis: a crisis occurs, if a constellation of circumstances brings about the losing of the system's structure, which also means the end of the system.

Technically speaking, World-systems analysis is not a theory, but an approach to social analysis and social change. It is based in part on the works of Samir Amin, Giovanni Arrighi, Andre Gunder Frank, and Immanuel Wallerstein with major contributions by Christopher Chase-Dunn, Volker Bornschier, Peter Turchin, Andrey Korotayev, Janet Abu Lughod, Thomas D. Hall, Kunibert Raffer, David Wilkinson, and others.

It should be noted that World-systems analysis is not only derived from the neo-Marxist literature on development but also from the French Annales School tradition(especially Fernand Braudel).

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Systems theory

Systems theory is an interdisciplinary field of science and the study of the nature of complex systems in nature, society, and science. More specifically, it is a framework by which one can analyze and/or describe any group of objects that work in concert to produce some result. This could be a single organism, any organization or society, or any electro-mechanical or informational artifact. Systems theory first originated in biology in the 1920s out of the need to explain the interrelatedness of organisms in ecosystems.[1] As a technical and general academic area of study it predominantly refers to the science of systems that resulted from Bertalanffy's General System Theory (GST), among others, in initiating what became a project of systems research and practice.

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