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Articles 61 - 73 of 73
Full-Text Articles in Operations Research, Systems Engineering and Industrial Engineering
Pavement Deterioration Modeling And Design Of A Composite Pavement Distress Index For Kentucky Interstate Highways And Parkways., Chenglong Luo
Pavement Deterioration Modeling And Design Of A Composite Pavement Distress Index For Kentucky Interstate Highways And Parkways., Chenglong Luo
Electronic Theses and Dissertations
Pavement deterioration is one of the most important driver for prioritizing pavement management and preservation (PMP) projects. The primary goal of this thesis is to provide reasonable predictive functions from multiple linear regression (MLR) models and artificial neural networks (ANN) that can be adopted by Kentucky Transportation Cabinet (KYTC). Furthermore, we use analytic hierarchy process (AHP) to design a composite pavement distress index in order to help Kentucky Transportation Cabinet (KYTC) prioritizing PMP projects based on 11 different distress indices. Numerical results show that the MLR models provide relatively high R square values of approximately 0.8. Both MLR and ANN …
Two-Stage Network Design In Humanitarian Logistics., Seyed Soroush Moeini
Two-Stage Network Design In Humanitarian Logistics., Seyed Soroush Moeini
Electronic Theses and Dissertations
Natural disasters such as floods and earthquakes can cause multiple deaths, injuries, and severe damage to properties. In order to minimize the impact of such disasters, emergency response plans should be developed well in advance of such events. Moreover, because different organizations such as non-governmental organizations (NGOs), governments, and militaries are involved in emergency response, the development of a coordination scheme is necessary to efficiently organize all the activities and minimize the impact of disasters. The logistics network design component of emergency management includes determining where to store emergency relief materials, the corresponding quantities and distribution to the affected areas …
A Novel Numerical Framework For Simulation Of Multiscale Spatio-Temporally Non-Linear Systems In Additive Manufacturing Processes., Nachiket Patil
A Novel Numerical Framework For Simulation Of Multiscale Spatio-Temporally Non-Linear Systems In Additive Manufacturing Processes., Nachiket Patil
Electronic Theses and Dissertations
New computationally efficient numerical techniques have been formulated for multi-scale analysis in order to bridge mesoscopic and macroscopic scales of thermal and mechanical responses of a material. These numerical techniques will reduce computational efforts required to simulate metal based Additive Manufacturing (AM) processes. Considering the availability of physics based constitutive models for response at mesoscopic scales, these techniques will help in the evaluation of the thermal response and mechanical properties during layer-by-layer processing in AM. Two classes of numerical techniques have been explored. The first class of numerical techniques has been developed for evaluating the periodic spatiotemporal thermal response involving …
Predictions Of Nox Emissions In Pulverized Coal Combustion., Niko Hachenberg 1981-
Predictions Of Nox Emissions In Pulverized Coal Combustion., Niko Hachenberg 1981-
Electronic Theses and Dissertations
The purpose of this research work was to develop a transferable mathematically simple model which gives the possibility to make fast and easy predictions regarding the NOx emission behavior of a broad–spectrum of coals within a certain combustion environment. In this context, this thesis is a further step of a common ongoing investigation focused on predicting NOx emissions from self–sustaining, pulverized coal combustion in dry bottom firing systems. A comprehensive literature research focused on already published NOx prediction approaches from scientific publications based on fundamental quantitative relationships or empirical algorithms and statistical relationships was also carried out in this context. …
Early Detection And Control Of Potential Pandemics., Shengpeng Jin
Early Detection And Control Of Potential Pandemics., Shengpeng Jin
Electronic Theses and Dissertations
Over the centuries, human beings have been inflicted with a variety of contagious diseases, resulting in tens of millions of respiratory illnesses and deaths worldwide. Early detection of disease spread facilitates timely responses that can greatly reduce its impact on a population. Therefore, this early information is a major public health objective and is crucial for policy makers and public health officials responsible for protecting the public from the spread of contagious diseases. Current indicators of the spread of contagious outbreaks lag behind its actual spread, leaving no time for a planned response. The studies of Christakis et al. in …
Implications Of Additive Manufacturing On Complexity Management Within Supply Chains In A Production Environment., Andre Kieviet
Implications Of Additive Manufacturing On Complexity Management Within Supply Chains In A Production Environment., Andre Kieviet
Electronic Theses and Dissertations
This dissertation focuses on developing a generic framework for using additive manufacturing as an appropriate production method to address the management of complexity in supply chains. While several drivers such as changing customer demand patterns and intensifying global competition increase product complexity, the available number of product variants and related processes within the supply chain itself increase costs and dilute scale effects. Several concepts and tools like mass customization, modularization, and product platforms have been developed in the past decades, but most of them focus on the product structure. Currently, there is no comprehensive tool set developed in the field …
A Heuristic Algorithm For Determining The Part Set In A Powder-Bed Additive Manufacturing Machine., Sonja Dieder
A Heuristic Algorithm For Determining The Part Set In A Powder-Bed Additive Manufacturing Machine., Sonja Dieder
Electronic Theses and Dissertations
The goal of this research is to develop a procedure for the placement of a priority part into a planned build in a powder-bed additive manufacturing machine. Toward that goal, a heuristic procedure was developed that seeks to maximize the revenue in a scheduled build, subject to due-date constraints; i.e., all parts with the closest due date will not only be included in the build, but will be placed near the bottom of the build. Likewise, any part in the scheduled build that does not have an immediate due date is a candidate for removal in order to accommodate a …
Simulation Model For Optimization Of A Landside Harbor Logistic Chain Of Container Terminals., Klaus Striegel
Simulation Model For Optimization Of A Landside Harbor Logistic Chain Of Container Terminals., Klaus Striegel
Electronic Theses and Dissertations
The world wide transportation of all kind of goods with containers is a fast growing business. The challenge is to transport in the shortest time to the lowest cost. The vessels therefore become bigger and bigger. The biggest vessel with 16000 TEU is since December 2012 in service. But the next generation with 18000-22000 TEU is already being built. This raises questions in acceleration of loading and unloading process, the handling in the yards of the harbors and the transportation of the containers to Hinterland. The most common way is still to transport the container from the yard by truck, …
Systematic Parameter Analysis For Selective Laser Melting (Slm) Of Silver-Based Materials., Harald Rieper
Systematic Parameter Analysis For Selective Laser Melting (Slm) Of Silver-Based Materials., Harald Rieper
Electronic Theses and Dissertations
Selective Laser Melting (SLM) is a growing technology for the additive manufacturing of parts and structures. Based on a powder layer technique, a laser locally melts the powder and forms new structures. [1] In this approach, silver-based alloy powders will be used. The processing of this kind of material is considered difficult compared to other powder materials such as mild steels or tool steels. Silver powder is a highly reflecting material and has excellent thermal conductivity. Both properties make it difficult to process using Selective Laser Melting. Due to its high price, industries use silver parts as economically as possible …
Linking Corporate Strategy To Operations : A Critical Review Of Prof. Kaplan’S Theories And The Development Of A Best-Practice Approach., Alexander Bogner
Linking Corporate Strategy To Operations : A Critical Review Of Prof. Kaplan’S Theories And The Development Of A Best-Practice Approach., Alexander Bogner
Electronic Theses and Dissertations
The rising speed of change in global frameworks drives international companies into a non-stop changing organization with the need of generating optimal revenues under changing conditions. Regarding to the need to be a flexible and competitive organization the value of a vision and a perfectly streamed strategy to this vision becomes a main success factor for global business. The trend for the need of development of a clear and constant strategy is equally rising with the trend of globalization and intercontinental business companies and therefor the business of strategy consulting rises constantly from the late 1990. Most of the strategy …
The Assignment Problem With Dependent Costs., Ghazal Tariri
The Assignment Problem With Dependent Costs., Ghazal Tariri
Electronic Theses and Dissertations
Assigning workers, each with their own skill set, to tasks which demand different skills in an efficient manner is a challenging problem that often requires workers to receive additional training. The training of workers is very costly with Training Magazine’s Annual Industry Report stating 58.5 billion dollars were spent in 2007 on employee training in the United States. Therefore assigning workers to tasks in such a way as to minimize the overall training costs is an important problem in many organizations. In this research, the assignment problem with dependent cost is considered, i.e. the training cost associated with assigning a …
Using Discrete Event Simulation To Improve The Patient Care Process In The Emergency Department Of A Rural Kentucky Hospital., Molly Cassaro Jones
Using Discrete Event Simulation To Improve The Patient Care Process In The Emergency Department Of A Rural Kentucky Hospital., Molly Cassaro Jones
Electronic Theses and Dissertations
The patient care process of a rural Kentucky hospital is a complex process that must be flexible in order to deal with a large variety of patient needs and a fluctuating patient volume where all patients are unscheduled. A simulation model of an average month in the emergency department was built using the Arena Simulation package. Methods for creating a simulation using Arena are included in this work. Statistics were generated from a number of different sources to create an accurate representation of the model. The Hospital reporting shows a need to improve on two quality measures being tracked, the …
Optimal Charging Scheduling For Battery Electric Vehicles Under Smart Grid., Nur Dayana Abd Rahman
Optimal Charging Scheduling For Battery Electric Vehicles Under Smart Grid., Nur Dayana Abd Rahman
Electronic Theses and Dissertations
A projected high penetration of battery electric vehicles (BEV s) in the market will introduce an additional load in the electricity grid. Furthermore, uncontrolled BEV charging from residential users will exacerbate the existing peak load during evening hours. In this thesis, we propose two optimization models to alleviate the impact of extra demand from electric vehicles on the power grid. The first is a centralized charging scheduling model that coordinates the charging among BEV users under the goal of minimizing the total electricity cost for all users. The second model uses a decentralized agent-based approach to scheduling the BEV charging. …