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A basic problem in scheduling involves the sequencing of a set of independent tasks at a single facility with the objective of minimizing mean tardiness. Although the problem is relatively simple, the determination of an optimal sequence remains a challenging combinatorial problem. A number of algorithms have been developed for finding solutions, and this paper reports a comparative evaluation of these procedures. Computer programs for five separate algorithms were written and all were run on a data base designed to highlight computational differences. Optimizing algorithms developed by Emmons and by Srinivasan appeared to be particularly efficient in the comparative study. 相似文献
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The UK Ministry of Defence is British industry's largest single customer and a number of firms and industries are highly dependent on defence sales. Various hypotheses have been proposed about the impact of defence procurement on firms and these are investigated using four performance indicators: financial structure, investment, productivity and profitability. With regard to the borrowing ratio, capital investment and the rate of return, there is no statistically significant difference between the mean financial ratios for low and high dependence firms. However, non‐dependents appear to have a higher level and rate of growth of labour productivity than dependents. 相似文献
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Martin C. Mcguire 《Defence and Peace Economics》2013,24(4):251-270
A nation's wealth is both an object of conquest to covetous aggressors and a resource to its owners for self defense. To maintain autonomy every country must mount a defense which either makes its capture (1) more expensive than any aggressor can afford, or (2) more expensive than it is worth to aggressors. Whether this condition can be satisfied for all countries simultaneously depends as shown in this paper on relative efficacy of military offense versus defense, the aggregate of wealth among nations and its distribution, and the benefits a conqueror may obtain from conquest, including the duration of these benefits. The paper shows how these factors fit together to determine the sustainability and stability of the international distribution of property as embodied in the configuration of sovereign states. 相似文献
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The period after 9/11 can be characterised as the terrorism moment in world history. Every actor in international relations—the state, regional, continental and international as well as civil society organisations—has been mobilised to combat what, apparently has been conceived as a common security threat to humanity. The transformation of the Organisation of African Unity (OAU) into the African Union (AU) was a divine coincidence at a time when multilateralism and international cooperation were being challenged by the threat of terrorism. In the post-9/11 period, the main concern of the Union has been to reinforce and implement existing counter-terrorism instruments adopted at the continental level in coordination with states and regional organisations. This article discusses and appraises the endeavours undertaken by the AU and its precursor organisation, the OAU, in tackling and dealing with the threat of terrorism despite limitations to its human and financial resources. In recognition of the nature of the states in Africa and the challenges facing the Union, we argue that the role of the AU remains critical in order to fill the gaps where its member states or regional mechanisms are lacking. In this regard, we stress that the role of the AU should be complementary and serve as an interface between the continent and the international community, including the United Nations. 相似文献
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Martin Schönteich 《African Security Review》2013,22(2):39-51
After only ten years in existence, the African Union (AU) has already made its mark on the landscape of peace and security in Africa. This paper seeks to explore the relationship between the AU's leading collaborative interstate security policy, the African Peace and Security Architecture (APSA), and sustainable peace in the Horn of Africa. It examines four countries – Djibouti, Eritrea, Ethiopia, and Kenya – and how engaging with the APSA through early warning systems can contribute to developing the elements necessary for sustainable peace, namely regional stability, conflict management, and good governance. 相似文献
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