排序方式: 共有33条查询结果,搜索用时 0 毫秒
21.
22.
23.
Benjamin Greene 《战略研究杂志》2013,36(4):156-185
Though historians debate whether Eisenhower seriously pursued a nuclear test ban agreement at the close of his presidency, few have closely examined his consideration of the issue during his first term in office. Publicly, his administration ridiculed Democratic presidential candidate Adlai E. Stevenson's highly publicized test ban proposal in 1956. In fact, Eisenhower's private inclination to ban testing antedated Stevenson's campaign proposal by two years. A review of the administration's techniques of countering Stevenson's test ban proposal reveals the use of heated rhetoric, clever deception, and outright lies to manipulate public understanding of the test issue and to conceal the depth of Eisenhower's own sincere desire to limit, or even cease, tests. 相似文献
24.
This article considers the efficient scheduling of a fleet of ships engaged in pickup and delivery of bulk cargoes. Our optimization system begins by generating a menu of candidate schedules for each ship. This menu can contain all feasible solutions, which guarantees we will find an optimal solution or can be heuristically limited to contain only those schedules likely to be in an optimal solution. The problem of choosing from this menu an optimal schedule for the fleet is formulated as a set-packing problem and solved with a dual algorithm. Computational experience is presented based on real data obtained from the Military Sealift Command of the U. S. Navy. Run times for this data were reasonable and solutions were generated with the potential of saving up to about $30 million per year over the manual system currently in place. We also describe a color-graphics interface developed to facilitate interaction with the optimization system. 相似文献
25.
26.
Benjamin Legros 《海军后勤学研究》2023,70(1):53-71
This study aims to determine and evaluate dynamic idling policies where an agent can idle while some customers remain waiting. This type of policies can be employed in situations where the flow of urgent customers does not allow the agent to spend sufficient time on back-office tasks. We model the system as a single-agent exponential queue with abandonment. The objective is to minimize the system's congestion while ensuring a certain proportion of idling time for the agent. Using a Markov decision process approach, we prove that the optimal policy is a threshold policy according to which the agent should idle above (below) a certain threshold on the queue length if the congestion-related performance measure is concave (convex) with respect to the number of customers present. We subsequently obtain the stationary probabilities, performance measures, and idling time duration, expressed using complex integrals. We show how these integrals can be numerically computed and provide simpler expressions for fast-agent and heavy-traffic asymptotic cases. In practice, the most common way to regulate congestion is to control access to the service by rejecting some customers upon arrival. Our analysis reveals that idling policies allow high levels of idling probability that such rejection policies cannot reach. Furthermore, the greatest benefit of implementing an optimal idling policy occurs when the objective occupation rate is close to 50% in highly congested situations. 相似文献
27.
Benjamin S. Lambeth 《战略研究杂志》2013,36(3):289-316
For 74 days in mid-1999, India waged an intense war against intruding Pakistani forces on the Indian side of the Line of Control dividing Kashmir in the Himalayas. The Indian Air Force (IAF) was a key contributor to India's eventual victory in that war. Among other things, the IAF's combat performance showed how the skillful application of air-delivered firepower, especially if unmatched by the other side, can shorten and facilitate the outcome of an engagement that might otherwise have persisted indefinitely. It also showed that a favorable position in the conventional balance remains strategically useful even in conditions of mutual nuclear deterrence. 相似文献
28.
29.
Benjamin Jensen 《Low Intensity Conflict & Law Enforcement》2004,12(1):51-90
How are refugees mobilised in identity based conflicts? How do internally displaced persons and refugees become utilised as a multidimensional source of agitation and escalation? Are there steps the international community can take to limit the political radicalisation and militarisation of refugees? The research and policy recommendations that arise in addressing these broad-based research questions represent a test of how the assistance the international community provides to transitional states operates in relation to the internal dialectic of national security. Specifically, a detailed case study of the Abkhaz-Georgian conflict and the degree of refugee militarisation is analysed through a series of state-centric, sociological and military models in order to form a basis for creating new US policy options able to demilitarise existing demographic pressures. 相似文献
30.