Journal ArticleDOI
Pulling the distribution in supply chains: simulation and analysis of Dynamic Buffer Management approach
TLDR
Inventory management in supply chains faces several typical problems, such as low turnover, high inventory investments, lost sales due to a stockout of certain items and surpluses of these same items as mentioned in this paper.Abstract:
Inventory management in supply chains faces several typical problems, such as low turnover, high inventory investments, lost sales due to a stockout of certain items and surpluses of these same ite...read more
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Dissertation
System-Level Seismic Risk Assessment of Bridge Transportation Networks
Abstract: Earthquakes can have significant impacts on transportation networks because of the physical damage they can cause to bridges. Hence, it is essential to assess the seismic risk of a bridge transportation network accurately. However, this is a challenging task because it requires estimating the performance of a bridge transportation network at the system level. Moreover, it is necessary to deal with various possible earthquake scenarios and the associated damage states of component bridges considering the uncertainty of earthquake locations and magnitudes. To overcome these challenges, this study proposes a new method of system-level seismic risk assessment for bridge transportation networks employing probabilistic seismic hazard analysis (PSHA). The proposed method consists of three steps: (1) seismic fragility estimation of the bridges based on PSHA; (2) system-level performance estimation using a matrix-based framework; and (3) seismic risk assessment based on the total probability theorem. In the proposed method, PSHA enables the seismic fragility estimation of the component bridges considering the uncertainty of earthquake locations and magnitudes, and it is systemically used to carry out a posthazard bridge network flow capacity analysis by employing the matrix-based framework. The proposed method provides statistical moments of the network performance and component importance measures, which can be used by decision makers to reduce the seismic risk of a target area. To test the proposed method, it is applied to a numerical example of an actual transportation network in South Korea. In the seismic risk assessment of the example, PSHA is successfully integrated with the matrix-based framework to perform system reliability analysis in a computationally efficient manner.
References
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Journal ArticleDOI
Log-normal Distributions across the Sciences: Keys and Clues
TL;DR: Many widely used statistical methods, such as ANOVA (analysis of variance) and regression analysis, require that the data be normally distributed, but only rarely is the frequency distribution of data tested when these techniques are used.
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Developing Theory Through Simulation Methods
TL;DR: A roadmap is developed that describes theory development using simulation and position simulation in the “sweet spot” between theory-creating methods, such as multiple case inductive studies and formal modeling, and theory-testing methods.
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Computerized shop floor scheduling
TL;DR: This article describes the evolutionary process from basically a computerized Kanban to an attempted computerization of the Drum-Buffer-Rope technique, and the reasoning that brought this evolution so quickly to its ultimate conclusion.
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Applying the theory of constraints to supply chain collaboration
TL;DR: In this paper, the authors apply the theory of constraints approach to overcome difficulties in realising the potential benefits of supply chain collaboration and establish collaborative replenishment policy and collaborative performance metrics so that the chain members can work together to advance supply chain profitability.