碩士 / 國立成功大學 / 交通管理(科學)學系 / 85 / Time definite cargo distribution carriers pickup,
consolidate and deliver partial loads.The strategy for a
successful carrier is to provide services with competitive
prices,design a freight transportation network, and implement an
efficient operating plan tomaximize its profits. The freight
transportation network consists of two sub-networks,line-haul
operations and service operations. A proper line-haul operations
network canprovide ample opportunities to consolidate partial
loads therefore, reducestractor-trailer runs. On the other
hand, a proper service network will providenot only convenient
facilities but also a high quality services for customers. The
hub-and-spoke network is a most commonly used and proven to be
an efficientnetwork structure for freight shipments. However,
the network structure oftime definite carriers in Taiwan mainly
consists of operating spokes(centers).The consolidation function
of partial loads is performed in some designated large
centerswhich is integrated but often conflicted with pickup and
delivery operations.Additionally, the lack of mechanical
consolidation facilities, due to insufficient volumes,results in
a high sorting cost. In order to avoid high sorting costs,
carriers adopt stopover operation. 83% of the feeder runs
perform loadingand unloading operations at centers on their
routes.Unfortunately, the stopover operation substantially
reduces the usable trailer capacitywhich results an ineffective
feeder operation. In the near future, the external environments
for carriers will be undergo a substantial change.The demand
will increase which may exceed carriers'' current capacities.The
desire of the Central Government in Taiwan to join WTO may
result in aderegulation of the cargo industry to allow the
entrance of international carriersfor domestic cargo. The
government will also implement a stimulate package tocombat the
economic depression. The economic package includes release
ofnon-productive farm lands and a construction of 12 additional
inter-city expressways.Thus, some of the carriers size this
opportunity to totally reconstruct their freighttransportation
networks. The network under consideration is based on a hub-
and-spokeconfiguration. The whole island of Taiwan will need
three major hubs and a high density ofsmall scale centers. The
purpose of this research is to study the transportation network
design problem for carriers.We investigate the current time
definite cargo market to understand the service characteristics.
We also survey carriers to gain the insight of the their
operational characteristics.With the information of operational
restrictions and candidate facility locations,we construct a
network design mathematical model for carriers anddevelop a
local improvement heuristic algorithm to solve such a NP hard
integeprogramming problem. We use one of the three carriers in
Taiwan as the numerical examples.
| Identifer | oai:union.ndltd.org:TW/085NCKU0119025 |
| Date | January 1997 |
| Creators | Liou, Jyh-Yeuan, 劉志遠 |
| Contributors | Cheng-Chang Lin, 林正章 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 95 |
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