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51.
This work continues to develop the 'netwar' concept that the authors introduced in 1993 and have expanded upon in their various RAND and other writings ever since. Deeper understanding of the nature, strengths and vulnerabilities of networks will prove useful in combating terrorism and transnational crime, but also in understanding militant social activism, both of the violently disruptive sort and that which aims at fostering the rise of a global civil society. This essay also assesses recent US performance in the terror war, and concludes by raising concerns over the possible rise of a new form of network-based fascism. 相似文献
52.
Many important problems in Operations Research and Statistics require the computation of nondominated (or Pareto or efficient) sets. This task may be currently undertaken efficiently for discrete sets of alternatives or for continuous sets under special and fairly tight structural conditions. Under more general continuous settings, parametric characterisations of the nondominated set, for example through convex combinations of the objective functions or ε‐constrained problems, or discretizations‐based approaches, pose several problems. In this paper, the lack of a general approach to approximate the nondominated set in continuous multiobjective problems is addressed. Our simulation‐based procedure only requires to sample from the set of alternatives and check whether an alternative dominates another. Stopping rules, efficient sampling schemes, and procedures to check for dominance are proposed. A continuous approximation to the nondominated set is obtained by fitting a surface through the points of a discrete approximation, using a local (robust) regression method. Other actions like clustering and projecting points onto the frontier are required in nonconvex feasible regions and nonconnected Pareto sets. In a sense, our method may be seen as an evolutionary algorithm with a variable population size. © 2005 Wiley Periodicals, Inc. Naval Research Logistics, 2005. 相似文献
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With the recent trend toward just-in-time deliveries and reduction of inventories, many firms are reexamining their inventory and logistics policies. Some firms have dramatically altered their inventory, production, and shipping policies with the goal of reducing costs and improving service. Part of this restructuring may involve a specific contract with a trucking company, or it may entail establishing in-house shipping capabilities. This restructuring, however, raises new questions regarding the choice of optimal trucking capacity, shipping frequency, and inventory levels. In this study, we examine a two-level distribution system composed of a warehouse and a retailer. We assume that demand at the retailer is random. Since the warehouse has no advance notice of the size of the retailer order, inventory must be held there as well as at the retailer. We examine inventory policies at both the warehouse and the retailer, and we explicitly consider the trucking capacity, and the frequency of deliveries from the warehouse to the retailer. Both linear and concave fixed transportation costs are examined. We find the optimal base stock policies at both locations, the optimal in-house or contracted regular truck capacity, and the optimal review period (or, equivalently, delivery frequency). For the case of normally distributed demand we provide analytical results and numerical examples that yield insight into systems of this type. Some of our results are counterintuitive. For instance, we find some cases in which the optimal truck capacity decreases as the variability of demand increases. In other cases the truck capacity increases with variability of demand. © 1993 John Wiley & Sons, Inc. 相似文献
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56.
David S. Yost 《战略研究杂志》2013,36(3):339-374
Kathleen Burk, Britain, America and the Sinews of War 1914–1918. Boston and London: Allen &; Unwin, 1985. Pp.x + 286; £20.00. Keith Jeffery, The British Army and the Crisis of Empire 1918–1922. Manchester: Manchester University Press, 1984. Pp.viii + 200; £21.00. Carlo D'Este, Decision in Normandy. London: Pan Books in association with Collins, 1984. Pp.xii + 555; £3.95. R. J. Overy, Goering: The ‘Iron Man’, London: Routledge &; Kegan Paul, 1984. Pp. x + 310; bibliography; index; £14.95. John Barron, KGB: The Hidden Hand. New York: Reader's Digest Press, 1983. Pp.489. $15.95. Edward Van Der Rhoer, The Shadow Network: Espionage as an Instrument of Soviet Policy, New York: Charles Scribner's Sons, 1983. Pp.359. $19.95. David Holloway and Jane M. O. Sharp (eds.), The Warsaw Pact: Alliance in Transition? London: Macmillan Press, 1984. Pp.290; £25. A. Ross Johnson, Robert W. Dean and Alexander Alexiev, East European Military Establishments: The Warsaw Pact Northern Tier. New York: Crane, Russak, 1982. Pp.xiii + 182; $19.50. Condoleezza Rice, The Soviet Union and the Czechoslovak Army, 1948–1983: Uncertain Allegiance. Princeton, NJ: Princeton University Press, 1985. Pp.xiv + 303; £40.40. Trevor Taylor, European Defence Cooperation (Chatham House Papers, No. 24). London: Routledge &; Kegan Paul for RIIA, 1984. Pp.97; £4.95. Phil Williams, US Troops in Europe (Chatham House Papers, No. 25). London: Routledge &; Kegan Paul for RIIA, 1984. Pp.87; £5.95. Daniel Frei, Assumptions and Perceptions in Disarmament. New York and Geneva: United Nations, 1984. Pp.xiv + 321; NP. Joseph Rotblat and Alessandro Pascolini (eds.), The Arms Race at a Time of Decision, Annals of Pugwash 1983. London and Basingstoke: Macmillan, 1984. Pp.xxiv + 291; £20 (hardback) and £7.95 (paperback). Philip H. Frankel, Pretoria's Praetorians. Cambridge: Cambridge University Press, 1984. Pp. xx + 215; £23.50. Brian May, Russia, America, the Bomb and the Fall of Western Europe. London: Routledge &; Kegan Paul, 1984. Pp.vii + 248. £11.95. Robert Jervis, The Illogic of American Nuclear Strategy. Ithaca and London: Cornell University Press, 1984. Pp.203; $19.95. 相似文献
57.
Africa is arguably the most important regional setting for United Nations peacekeeping challenges. In the 1990s, extensive efforts have been made by the United Nations in the fleld of peacekeeping with the speciflc aim of reducing the levels of conflicts on the continent. Another significant development relates to the fact that organisations in Africa have started to feature as important peacekeeping instruments in recent years as it is increasingly being accepted that there is a need for such institutions to take care of their own security requirements. However, a key issue at stake is the need to achieve greater consistency with regard to third-party intervention in African conflicts. A look at the more glaring examples of multinational operations in the name of peace and security gives a sense of the magnitude and difficulties often experienced during such endeavours. In addition, both past and current operations have brought to light certain perspectives and lessons that require careful analysis and study. In this article, an overview is given of some of the perils and challenges associated with multinational operations in the realm of peace and security. Specifically, the focus is on Africa and on key issues and challenges regarding the strategic and operational management of such operations in view of the need to consider a more integrated approach towards multinational operations in support of peace and security in Africa. 相似文献
58.
David Gold 《Defence and Peace Economics》2013,24(3):251-266
Using tests of a single equation model and cointegration techniques, this paper finds no evidence of a long run trade‐off, and some evidence of a short‐run trade‐off, between military spending and investment in post‐World War II United States data. The short‐run trade‐off is confined to the 1949–1971 period, and may be the result of the sharp expansion and contraction of military outlays in connection with the Korean and Vietnam Wars. In addition, cointegration techniques are used to identify a possible long‐run trade‐off between military spending and consumption. 相似文献
59.
Doctor David J. Kilcullen 《战略研究杂志》2013,36(4):597-617
This article suggests that the War on Terrorism is actually a campaign against a globalized Islamist 1 insurgency. Therefore, counterinsurgency approaches are more relevant to the present conflict than traditional terrorism theory. Indeed, a counterinsurgency approach would generate subtly, but substantially different, policy choices in prosecuting the war against Al Qaeda. Based on this analysis, the article proposes a strategy of ‘disaggregation’ that seeks to dismantle, or break, the links in the global jihad.2 Like containment in the Cold War, disaggregation would provide a unifying strategic conception for the war – a conception that has been somewhat lacking to date. 相似文献
60.
Whose preferences determine the tradeoff between security and civilian output in deciding upon budget allocations to defence? This paper considers the role that consumer preferences might play in influencing military spending. We propose normative criteria to judge the economic or political efficiency of defence provision at a given time, and test them using Australian survey‐based micro‐data. Our results suggest that the political system has not delivered a simple social‐choice translation of individual preferences into collective outcomes, nor has it delivered results consistent with simple majority‐voting median preferences. 相似文献