碩士 / 長榮大學 / 航運管理學系碩士班 / 97 / The length of ship waiting time and berth idle time depends upon the inter-arrival time of ships. If the inter-arrival time is not long enough, it is very likely that the succeeding ship could wait for berthing because it arrive before the preceding ship’s departure time. On the other hand, if the inter-arrival time is longer than reasonable level, the berth could be idle because the succeeding ship arrive after the preceding ship’s departure time. To seek a reasonable inter-arrival time in order to minimize ship waiting time and berth idle time is an important task to terminal operations.
Queuing theory is a primary method dealing with ship waiting problem. Being designated to render steady performance measures for all ships under investigation as a whole, Queuing theory is not adequate to deal with queuing phenomena of two successive ships. Hence this study proposes a new method, based on concepts of probability of berth demand on time spot, to explore berth performance impacts resulting from differentials in ship’s inter-arrival time.
This study reveals that the ship waiting time become longer as the scale of standard deviation of ship arrival time and berthing time get larger. Assume that both the standard deviation of ship arrival time and berthing time equal to half of berthing time is justifiable in practice, then an inter-arrival time larger than 1.15 folds of berthing time is long enough to approach steady state in terms of waiting time of successive ships. The average ship waiting time is in the range of 0 to 0.01 folds of berthing time. And the berth idle time is about 0.06 to 0.16 folds of berthing time.
| Identifer | oai:union.ndltd.org:TW/097CJU00301002 |
| Date | January 2009 |
| Creators | Yue Jung Wang, 王躍仲 |
| Contributors | Tu-Cheng Kuo, 郭塗城 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 57 |
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