碩士 / 長榮大學 / 航運管理學系碩士班 / 101 / Tugboats are needed to assist vessels’ sailing and berthing in a port. The number and the type of tugboats inevitably affect the order of vessels’ sailing in and out of port. Kuo (2007) , based on job sequencing concept, created a sequencing model firstly. Xu (2008) then modified the model by taking the navigational practice into consideration. Lin (2012) improved the model by adding constraints related to tugboat operations. The authors make a slight change in constraints related to tugboat so as to fulfill the practice of tugboat operations.
This paper is designated to explore the variance of demand of tugboat causing by different vessel traffic intensity. The samples are obtained from the ships sailing in or out of 2nd entrance of Port of Kaoshiung in 2012. Each day divides into two periods; from 06:00 to 17:00 and from 18:00 to 05:00 the next day. Each periods divides into three conditions according to the vessel traffic , namely peak, normal, and off-peak. 5 samples are selected from each combination of periods and traffic conditions. Therefore, There are 30 samples in total.
Every sample comes out the voyages of tugboats being put in use. The outcomes are converted into cumulative probability distribution of tugboat by type. For a prespecified coverage ratio, the cumulative probability of a certain type of tugboat is used to determine the required number of that type of tuboat. Three level of coverage ratios, 80%, 90%, and 95%, are assumed in this study. The demand of tugboat for different periods and different traffic conditions are presented based on the three coverage ratios.
| Identifer | oai:union.ndltd.org:TW/101CJU00301009 |
| Date | January 2013 |
| Creators | Chu Shao-Chia, 曲紹嘉 |
| Contributors | Kuo Tu-Cheng, 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 | 68 |
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