Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1996. / Includes bibliographical references (leaves 70-71). / by James H. Knowles. / M.S.

Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1989. / Includes bibliographical references (leaves 98-100). / by Jong Gye Shin. / Ph.D.

Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1996. / Includes bibliographical references (p. 94-98). / by Michael D. Amrozowicz. / M.Eng.

Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 2000. / Includes bibliographical references (leaf 44). / by Diane Elizabeth Egnor. / S.M.

Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1997. / Includes bibliographical references (leaves 295-298). / by Sela Mordechai Meyouhas. / M.S.

Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1994. / Includes bibliographical references (leaves 55-56). / by Xuemei Zhu. / M.S.

Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1995. / Includes bibliographical references (p. 159). / by Monique V. Sinmao. / M.S.

Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 2000. / Includes bibliographical references (leaves 172-179). / Metal forming by a moving heat source is an efficient and economical method for forming flat metal plates into doubly curved shapes. This thesis proposes an FEM model for three dimensional thermo-mechanical simulation of the process of shell forming by line heating. Since the heat flux is focused on a small area under the heat source, a rezoning technique is developed to reduce computation time in three-dimensional numerical simulation. This involves dynamic remeshing of the metal plate so that the area directly under the heat source is densely meshed while other areas are sparsely meshed. A simplified model is also developed which is based on semi-analytical thermal analysis and idealization of plastic zone during line heating. This simplified model is useful in real-time control of the forming process since the computation time can be greatly reduced. The two thermo-mechanical models lead to a better understanding of the line heating mechanism and more accurate and efficient prediction of the deformation of metal plates. Based on these two models, parametric studies of the edge effects, heat input, heat source velocity, spot size, heat loss coefficients, etc. are performed, and nondimensional parameters which control the bending angle are derived. Finally, an algorithm for surface development for heating path planning is developed. This algorithm minimizes the strains from the doubly curved surface to its planar development. Compared with conventional surface development methods, this algorithm takes into account the characteristics of the process of forming by line heating. This surface development algorithm lays the basis for heating path determination. Based on the developed algorithms and models, we will be able to not only determine the heating paths, but also determine the heating conditions which are necessary to form an initial flat plate into a doubly curved plate. These are critical for automation of the metal forming process. / by Guoxin Yu. / Ph.D.

Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 2003. / Includes bibliographical references (p. 381-392). / The internet-based business (e-business) activities have become a new technological challenge to the container shipping industry (CSI) in recent years. Despite the growing importance of e-business in the CSI, little systematic and theoretical research on e-business has been undertaken so far. This research therefore attempts to understand the potential impacts of e-business on the container shipping industry and to provide carriers with the managerial recommendations responding to the impacts of e-business. An integrated system dynamics model is developed to simulate the potential impacts of e-business on the container shipping industry and to explore the successful managerial strategies for carriers with regard to e-business. In order to increase the confidence of the model, the general business dynamics in the CSI are reviewed and the historical impacts of new technologies on the container shipping industry are analyzed using the framework of technological evolution. Furthermore, the technology strategies of six different e-business models in the CSI are evaluated using the proposed three frameworks to identify the most promising e-business model. / The research finds that the profitability of carriers will be improved in the long term if they successfully develop the logistics service offering (LSO) with e-business in a cost efficient way. However, despite the improved profitability from the LSO and e-business, the container shipping service could be commoditized further unless changes are made to the current practice of expanding the containership capacity. In addition, the improved profits from the LSO and e-business will drive the structural changes in the container shipping industry. In order to improve the carriers' profitability over a long period of time, it is recommended that carriers continue to add new services on top of the container shipping service while expanding the containership capacity more wisely and conservatively. / by Jae Hyuck Auh. / Ph.D.

Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1994. / Includes bibliographical references (leaves 209-219). / by Yuming Liu. / Ph.D.