碩士 / 國立交通大學 / 運輸科技與管理學系 / 90 / International containerships have been running the pattern of the hub-and-spoke networks for twenty years. Based on the model of O''Kelly (1987), Hsieh and Chang（2001）proposed a marine hub-and-spoke network model which defined the discount factor（α）as the ratio of the unit travel cost of large ships to that of small ones. Most of the hub-and-spoke network models also used α to represent the economies of scale on interhub links. However, it is assumed that α is a constant value in their models so as to result in the miscalculation of the objective function. Up to now, neither do papers analyze influence of α on the model nor do papers calculate the exact value of α. In this paper, a discount factor model dedicates the fact of α and calculates the real value of α on main routes. The results of this paper are: one is that the unit travel cost is decreasing while the ship size is increasing which can prove the ship scale economies theory. ( Kendall,1972; Jasson & Sheneerson,1982.) The other is that optimal containership size increases as the distance of the route increases which can prove the theory of the optimal containership size. ( Talley,1990.)
| Identifer | oai:union.ndltd.org:TW/090NCTU0423024 |
| Date | January 2002 |
| Creators | Hui-Shu Hsu, 許惠淑 |
| Contributors | Shang-Hsing Hsieh, 謝尚行 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 0 |
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