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311.
The literature on the product mix decision (or master production scheduling) under the Theory of Constraints (TOC), which was developed in the past two decades, has addressed this problem as a static operational decision. Consequently, the developed solution techniques do not consider the system's dynamism and the associated challenges arising from the complexity of operations during the implementation of master production schedules. This paper aims to address this gap by developing a new heuristic approach for master production scheduling under the TOC philosophy that considers the main operational factors that influence actual throughput after implementation of the detailed schedule. We examine the validity of the proposed heuristic by comparison to Integer Linear Programming and two heuristics in a wide range of scenarios using simulation modelling. Statistical analyses indicate that the new algorithm leads to significantly enhanced performance during implementation for problems with setup times. The findings show that the bottleneck identification approach in current methods in the TOC literature is not effective and accurate for complex operations in real‐world job shop systems. This study contributes to the literature on master production scheduling and product mix decisions by enhancing the likelihood of achieving anticipated throughput during the implementation of the detailed schedule. © 2015 Wiley Periodicals, Inc. Naval Research Logistics 62: 357–369, 2015 相似文献
312.
313.
The article presents a Bayesian analysis for the environmental stress screening problem. The decision problem of deriving optimal stress screen durations is solved. Given a screen duration, the optimal stress level can also be determined. Indicators of the quality of a screen of any duration are derived. A statistical model is presented which allows a posterior density for the rate of early failures of the production process to be calculated. This enables the user to update his opinion about the quality of the process. © 1994 John Wiley & Sons, Inc. 相似文献
314.
Jugdep S. Chima 《Small Wars & Insurgencies》2013,24(4):615-637
This article examines the ‘political’ and ‘military’ strategies used by the Indian state successfully to quell the Sikh insurgency in Punjab, and applies these lessons to controlling the Sunni insurgency in Iraq. At a conceptual level, this article argues that insurgencies are both a ‘military’ and ‘political’ phenomenon, and that ways to quell them can be either ‘military’ or ‘political,’ or a combination thereof. At the empirical level, this article argues that stability cannot be restored to Iraq until Sunni political actors are effectively brought into the mainstream political process through either ‘military’ or ‘political’ means, or a combination thereof. The analysis in this article provides substantive depth and detail to these otherwise seemingly straightforward propositions. 相似文献
315.
In this article, we study reliability properties of m‐consecutive‐k‐out‐of‐n: F systems with exchangeable components. We deduce exact formulae and recurrence relations for the signature of the system. Closed form expressions for the survival function and the lifetime distribution as a mixture of the distribution of order statistics are established as well. These representations facilitate the computation of several reliability characteristics of the system for a given exchangeable joint distribution or survival function. Finally, we provide signature‐based stochastic ordering results for the system's lifetime and investigate the IFR preservation property under the formulation of m‐consecutive‐k‐out‐of‐n: F systems. © 2011 Wiley Periodicals, Inc. Naval Research Logistics, 2011 相似文献
316.
This article introduces two new maximum entropy (ME) methods for modeling the distribution of time to an event. One method is within the classical ME framework and provides characterizations of change point models such as the piecewise exponential distribution. The second method uses the entropy of the equilibrium distribution (ED) for the objective function and provides new characterizations of the exponential, Weibull, Pareto, and uniform distributions. With the same moment constraints, the classical ME and the maximum ED entropy algorithms generate different models for the interarrival time. © 2014 Wiley Periodicals, Inc. Naval Research Logistics 61: 427–434, 2014 相似文献
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318.
Fenja Søndergaard Møller 《Small Wars & Insurgencies》2013,24(2):392-420
ABSTRACTResearch concerning authoritarian stability and peace usually investigates co-optation and repression. Recently, several studies argue that traditional legitimacy is also important for stability in monarchies. However, existing research rarely considers how legitimacy constrains rebellions and help the royal family to stay in power. Hence, this article explores the causal links between sources of traditional legitimacy and absence of uprisings. The study investigates the relationship with a case study of the Kingdom of Swaziland. In line with my expectations, I find a causal relationship between sources of traditional legitimacy and absence of popular uprisings. First, the royal family actively uses traditional legitimacy to justify their rule. Second, the Afrobarometer indicates that the Swazi people trust the King more than citizens in other African countries trust their head of state. Third, opposition actors have limited opportunities to mobilize the broader population against the monarchy. Fourth, traditional legitimacy dampens ongoing protests and thereby hinders their escalation into popular uprisings or political violence. Repression is clearly an important explanation for limited rebellion in Swaziland, but this article shows that also traditional legitimacy sources play a role. 相似文献
319.
A. S. Andreou K. E. Parsopoulos M. N. Vrahatis G. A. Zombanakis 《Defence and Peace Economics》2013,24(4):329-347
The aim of this paper is to indicate the extent to which the arms race against Turkey, in which Greece and Cyprus have been entangled, imposes a defence expenditure burden that is tough for the two allies to bear. To do so we have resorted to evaluating the optimal military expenditure for the two countries, allied in the context of the Integrated Defence Doctrine, which is compatible with the constraints imposed by the resources of their economies. All experiments and scenarios examined lead to the conclusion that the current defence burden of the two allies seems to be driving their economies beyond capacity limits. The fact remains, however, that under the circumstances, a one-sided disarmament policy like the one currently followed by Greece, is a risky choice given that the long-term armament programmes pursued by Turkey, whose role in this arms race has been proven as leading, leave very small room to the Greek and Cypriot sides to reduce their own defence expenditure. 相似文献
320.
S. Mansoob Murshed 《Defence and Peace Economics》2013,24(5):391-401
This paper constructs a macroeconomic model of North–South interaction where the flow of narcotics from the South to the North is restricted. The economic effects are akin to quantitative restrictions in trade policy. Two alternative policy scenarios will be considered. One involves reducing the supply of drugs at the source, accompanied by aid. Supply‐side restrictions have negative aggregate supply‐side effects in the producing region, because of the monopoly rents generated from that type of control. This makes them a second‐best policy, particularly if the accompanying aid is not used for poverty alleviation and fails to expand domestic aggregate demand. Alternatively, demand side restrictions will be found to be superior. 相似文献