• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 1806
  • 823
  • 566
  • 378
  • 89
  • 68
  • 68
  • 48
  • 42
  • 34
  • 33
  • 33
  • 29
  • 28
  • 27
  • Tagged with
  • 4312
  • 1108
  • 1012
  • 939
  • 938
  • 909
  • 696
  • 667
  • 650
  • 642
  • 363
  • 355
  • 253
  • 253
  • 249
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
81

Forecasting retention in the United States Marine Corps Reserve

Schumacher, Joseph F. 03 1900 (has links)
This is an empirical study using a logistic regression model to assess the impact of mobilization and unemployment on an individual's decision to stay in or leave the reserves. The goal is to find out the attrition behavior of USMCR participants in order to better establish recruiting and retention goals in the Reserve population. Questions regarding attrition influencers, effects of mobilization, and applicability to both officer and enlisted personnel were reviewed in this process. The effects of being called to active service are shown to have a positive effect on retention in the reserves. Similarly, serving in the SMCR and Stand-by Reserves are both shown in the model to have a positive effect on reserve retention. This makes sense, in that when an individual volunteers in the Marine Reserves, he or she evidences a desire to serve his country when called to do so. The negative effect of an increase in the number of days served on active duty, as shown in the results of the model, follows similar logic. Had the individual wanted to serve on a full-time active duty basis he would have volunteered for the active duty component. The longer he is asked to remain on active duty, the more dissatisfied he is, on average, with his participation in the reserves. The negative effect of an increase in the individual's home of record unemployment rate is also consistent with previous findings, and when combined with the negative effect of continued mobilization and recall from the IRR or a retired status, a significant negative impact is seen on the individual's decision to stay in. The findings indicate that multiple short activations have a positive impact, whereas the impact of fewer, lengthy activations is negative This study validated previous research regarding the likelihood to continue to serve in the Marine Corps Reserves. As a result, the Marine Corps has the potential to better allocate resources and schedule individual activations, reducing attrition. This can assist in shaping the force structure when the Marine Corps are needed.
82

Employing organizational modeling and simulation to reduce F/A-18E/F F414 engine maintenance time

Slack, William G., Hagan, Joel L. 12 1900 (has links)
The goal of this project was to determine how to decrease the F414 engine throughput time at the Aircraft intermediate Maintenance Division (AIMD) at Naval Air Station (NAS) Lemoore, California. To achieve this goal, organizational modeling was employed to evaluate how changes to the organizational structure of the Lemoore AIMD affected engine throughput time. Data collected to build the organizational model was acquired via interviews with AIMD personnel. A baseline model of the AIMD organization was developed for the purpose of modeling the organization[alpha]s current structure and performance. The actual, real-world, duration required to conduct F414 maintenance was compared to the duration predicted by the model and determined to be within 3%. Once confidence was gained that the baseline model accurately depicted the organization[alpha]s actual F414 maintenance performance, modifications or interventions to the model were made to evaluate how organizational changes would affect F414 maintenance duration. Interventions included paralleling the tasks associated with accomplishing administrative paperwork when initially receiving the F414 engine, and tasks associated with on-engine maintenance, combining personnel positions, adding personnel, and modifying the duration and frequency of meetings. The modeled results of these modifications indicated that the paralleling effort significantly decreased the F414 maintenance duration; likewise, decreasing meeting frequency and slightly increasing duration also facilitated a decreased duration.
83

Naval Station Everett Small Craft Piers Delta and Echo replace or repair analysis with recommendations

Leppard, Benjamin. 05 1900 (has links)
In 1994 the U.S. Navy resurrected a base in Everett, Washington and commissioned it as Naval Station Everett (NS Everett), the new homeport for six Naval vessels. Prior to 1994 the base had seen primary use as the homeport for a number of vessels during World War II. In the early 1940s Piers Delta and Echo were constructed to berth aircraft carriers and other warships. Piers Delta and Echo are 560 feet and 578 feet, respectively, and 46 feet wide. They are constructed out of pier decking and pile caps on timber piles. Naval vessels currently assigned to NS Everett berth at new piers on the base, while Piers Delta and Echo berth the small craft that support the larger vessels. The small craft mission includes tugboat services, base security and environmental response functions, and vessel boarding and search training for local units. / Contract number: N62271-97-G-0075 / US Navy (USN) author.
84

Throughput evaluation of an autonomous sustainment cargo container system

Yeh, Mingtze. 12 1900 (has links)
With the development of new concepts in military operations and reductions in manpower of our military forces, the promotion of autonomous systems has been pushed to the forefront. Autonomous containers will play an essential role in the ability to deliver logistical supplies to waterborne littoral vessels enabling them to maintain station and complete there military operations while reducing the threat to personnel. Programmed to deliver supplies to a specified local in a reasonable timetable, these containers will play an essential role to vessels such as Riverine Warfare patrol craft, Special Operations craft and Coast Guard search and rescue boats. Development of a successful autonomous system that can deliver logistical supplies in littoral human threat arenas would serve as an immense reduction in logistical supply costs. The research that is to be conducted will focus on the unique characteristics of an autonomous sustainment cargo container and its throughput evaluation. Use of geometric data and static stability is analyzed and compared. In depth analysis primarily focuses on the hull characteristics of the container and whether subtle alterations to the bow and stern units reduce the resistance and increase the efficiency of the deliverability rate of the autonomous system. / US Navy (USN) author.
85

Algoritmy pro automatizovanou logistiku / Algorithms for automated logistics

Tuláček, Michal January 2014 (has links)
This thesis deals with a real world problem of an optimal planning of transferring goods between stores of a certain retail company. The aim is to propose a system which, based on customer orders and current stock items availability, should be capable of devising an optimal plan. In this thesis, following a thorough analysis of the problem, there is a formalised problem of automated logistics. After a brief overview of existing approaches in the area of logistics problem solving, there are subsequently designed solution methods based on programming with limited conditions and mixed integer programming. Both methods are compared to each other experimentally, by taking into account the quality of the found solution and the methods' efficiency.
86

Sustainability and Logistics Organizations in Sweden

Malik, Zeeshan January 2019 (has links)
Sweden is an eco-modernist society where environmental, social and economic growth support each other. It is an industrialized country where the trade via road has tremendously increased. Road freight is a fundamental issue of sustainability because it is environmentally, socially and economically very challenging to move the product from the origin to end user. In addition to road freight, all components of logistics system are necessary to take into account in order to move the product form the origin to consumer. All logistics components have environmental, social and economic impact because there is a relationship between sustainability and organizational activities. In this dissertation, by using inductive approach, it has been analyzed that how the logistics organizations in Sweden are dealing with sustainability issues. The practices of the companies related to environmental sustainability and social sustainability are effective, technically feasible and economically viable. Organizations are working on the behalf of their sustainable integrated business plan that is simultaneously valuable for the environment, people and for the company itself in terms of profitability. For the firms, sustainable integrated business plan means that their strategies to earn profit reflect the environmental and social sustainability as well. The both environmental and social strategies are actually the regulators of the value chain of the organization with a vision to get profitability. These strategies engender the proficiency and competency into the company to remain profitable and competitive in the market. Doing business in a way that the society and the environment would not be harmed is actually economically beneficial for the organization because it actually helps the organization in reducing its cost. Each pillar of sustainability is important to sustain another pillar. Economic sustainability is important to improve environmental and social sustainability however, environmental and social sustainability are the key to achieve economic sustainability. Above all, it has been found that economic sustainability is not only dependent upon environment and society but also on the target market, business trend and other measures. Some futuristic concerns of the organizations regarding sustainability have also been found and all organizations are determinant to achieve more sustainability on the basis of those futuristic concerns.
87

Análise de desempenho operacional de sistemas logísticos e de transporte: aplicações de modelos de redes de filas. / Sem título em inglês

Yoshizaki, Hugo 24 April 1990 (has links)
Os modelos de redes de filas ainda são pouco utilizados na área de Logística e Transportes, apesar de algoritmos e ferramentas computacionais eficientes estarem disponíveis atualmente. Este trabalho objetiva justamente mostrar alguns desses modelos de redes de filas e aplica-los em exemplos específicos. Inicialmente, é feita uma breve revisão dos principais modelos e algoritmos encontrados na literatura, para, em seguida, resolver-se um problema de determinação de uma função de produção, usando um modelo de rede de filas em regime estacionário. Como segundo exemplo, é montado um modelo para análise de um sistema de transporte que opera com transientes, onde é utilizada a aproximação por filas determinísticas. Em ambos os casos, é realizada uma discussão sobre o conceito de saturação em uma rede de filas, sendo proposta extensão da definição do conceito para o caso de redes mistas de filas. / Queueing networks models have seldom been used in the Logistics and Transportation realm, although being very popular in modelling other complex systems in the Computer Sciences. This work intends to briefly describe the most common models of queueing networks and apply them in some particular cases. First of all, a production function for a logistic system is developed, using a stationary probability model. Then, a transportation system with trasients is analised, using a fluid approximation model. For both cases, the saturation concept for a closed chain is defined, and is extended for mixed queueing networks.
88

Three essays on mass customization. / CUHK electronic theses & dissertations collection / ProQuest dissertations and theses

January 2010 (has links)
Essay 1 examines how competitive strategies influence MC practices and how MC practices influence financial performance. A model is proposed to link both cost leadership and differentiation strategies with the coordinated implementation of MC practices of elicitation, process flexibility, and logistics, and finally, with the financial performance of the firm. The model is tested using data collected from mass customizers in China. Simultaneous equation modeling and hierarchical regression analyses are used to test the hypotheses embedded in the research model. The results reveal that both cost leadership and differentiation strategies have significant impact on MC practices. Moreover, the results indicate that a successful MC implementation requires that mass customizers use elicitation, process flexibility, and logistics in complement. Firms that can successfully implement all three MC practices tend to have better financial performance. / Essay 2 examines the relationships between supply chain integration (SCI) and MC capabilities. Based on data collected from 292 manufacturing firms located in different countries, the results show that both internal and customer integration contribute positively to MC capability. Positive interaction effects on MC capability are also found between internal and customer integration, and between internal and supplier integration. The results suggest that supplier integration play only a complementary role, supporting internal integration in the development of MC capabilities. Overall, the findings demonstrate the pivotal role of internal integration in supply chain integration. Though current research tends to view SCI as "outward-facing" integration, our results suggest that manufacturing finns should pursue internal integration as the foundation for successful MC. / Essay 3 investigates the roles of service and customer value co-creation in developing MC offerings. Using exploratory case study and grounded theory building, we analyze six Chinese manufacturers in the Pearl River Delta. According to the arguments of service-dominant logic (SDL), the two types of MC offerings (product-centric MC and solution-centric MC) are service provided by manufacturer (fundamental service and resource integration service), and customer value co-creation (information and knowledge exchange and integrated design and manufacturing). Using the configurational approach, we investigate the theoretical typologies among MC offerings, service, and value co-creation. The results suggest that an internal fit exists among the three elements, and the configuration needs to fit with the supply chain capability and task characteristics. / Mass customization (MC) has been considered an important competitive weapon of manufacturers all over the world. Many successful companies adopt it to deal with growing competition characterized by heterogeneous customer demands, accelerated new product development, and shortened product life cycles. Currently, MC has become an imperative in business competition and an important topic for researchers in many disciplines. This dissertation covers three issues about MC: 1) the impact of competitive strategies on MC practices; 2) the effects of SCI on MC capability; and 3) the roles of service and customer value co-creation in developing MC offerings. / [essay 1]. Competitive strategy and mass customization practices -- [essay 2]. Developing mass customization capability through supply chain integration -- [essay 3]. A field study of mass customization from service dominant logic perspective. / Zhang, Min. / Adviser: Xiande Zhao. / Source: Dissertation Abstracts International, Volume: 73-03, Section: A, page: . / Thesis (Ph.D.)--Chinese University of Hong Kong, 2010. / Includes bibliographical references (leaves 165-180). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Electronic reproduction. [Ann Arbor, MI] : ProQuest Information and Learning, [201-] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Electronic reproduction. Ann Arbor, MI : ProQuest dissertations and theses, [200-] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstract also in Chinese.
89

Benefiting from product intelligence : the case of customer-oriented logistics

Giannikas, Evangelos January 2015 (has links)
No description available.
90

A multiple objective approach for green logistics.

January 2012 (has links)
近年,可持續發展引起了物流界的關注。要在模糊和不確定的情況對不同資源,服務水平和利潤作出權衡取捨,一個多項目標決策框架是必需的。這份論文,我們會提出一個隨機線性效用涵數的問題。然後發展一個以權衡為基礎的互動方法去解決這個決策問題。這個方法成功地找出穩健的方案和非支配的方案。我們會利用一個北美州聯合運輸路徑選擇的案例來展示此方法的好處。此外,我們會提出一個啟發式解法來增加此互動方法的計算效能。 / Sustainability is one of many major concerns in the practice of logistics management today. With vague and ambiguous tradeos among resources, service level and prot, a multi-objective decision making framework will be essential. In this work, we formulate the problem using a random linear utility function. We develop a trade-o based interactive method to solve the problem. The interactive method successfully obtains robust solution and non-dominated solutions. We will illustrate the usefulness of the interactive method using an intermodal routing study under NAFTA (North America Free Trade Agreement). In addition, we propose a heuristic solution algorithm for the shortest path routing problem to further improve the efficiency on our interactive method. / Detailed summary in vernacular field only. / Lee, Ho Cheung Brian. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2012. / Includes bibliographical references (leaves 123-131). / Abstracts also in Chinese. / Abstract --- p.i / Acknowledgement --- p.iii / Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Introduction to Multi-objective Decision Making Problem to Green Logistics --- p.3 / Chapter 1.2 --- Our Contribution --- p.5 / Chapter 1.3 --- Organization of the thesis --- p.6 / Chapter 2 --- Literature Review --- p.7 / Chapter 2.1 --- Routing Problem with Green Consideration --- p.7 / Chapter 2.1.1 --- Intermodal Routing with Green Considerations --- p.10 / Chapter 2.2 --- Interactive Routing Method --- p.11 / Chapter 2.2.1 --- Linear Utility --- p.14 / Chapter 2.2.2 --- Interactive Routing with Green Consideration --- p.15 / Chapter 2.3 --- Conclusion --- p.16 / Chapter 3 --- Methodology --- p.17 / Chapter 3.1 --- Concept, Notation and Definition --- p.17 / Chapter 3.1.1 --- Finding Knees in Multi-objective optimization --- p.20 / Chapter 3.2 --- Existing Interactive Method --- p.23 / Chapter 3.2.1 --- Framework of interactive routing --- p.23 / Chapter 3.2.2 --- Geoffrion-Dyer-Feinberg (GDF) Algorithm --- p.24 / Chapter 3.2.3 --- Reference Direction (RD) Algorithm --- p.29 / Chapter 3.3 --- Trade-off Compromising Algorithm --- p.35 / Chapter 3.3.1 --- Description of Trade-off Compromising Algorithm --- p.36 / Chapter 3.3.2 --- Interactive Method for Multi-objective Shortest Path Problem --- p.45 / Chapter 3.4 --- Design of Computational Experiments --- p.64 / Chapter 3.5 --- Conclusion --- p.72 / Chapter 4 --- Case study on NAFTA --- p.74 / Chapter 4.1 --- Parameters of the Experiment --- p.77 / Chapter 4.1.1 --- Cost, Emission and Transit time --- p.77 / Chapter 4.1.2 --- Scenarios --- p.79 / Chapter 4.2 --- Computational Result --- p.79 / Chapter 4.2.1 --- Managerial Implication --- p.86 / Chapter 4.3 --- Conclusion --- p.97 / Chapter 5 --- Conclusion --- p.98 / Chapter A --- Data of the Case study in NAFTA --- p.102 / Chapter B --- Computational results --- p.106 / Chapter B.1 --- Computational result of the case studies --- p.106 / Chapter B.2 --- Computational result of testing number of iterations --- p.121 / Bibliography --- p.123

Page generated in 0.064 seconds