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- 저자 : Kawasaki Tomoya (검색결과 3 건)
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Kawasaki Tomoya,Tagawa Hoshi,Watanabe Toshihiro,Hanaoka Shinya 한국해운물류학회 2020 The Asian journal of shipping and Logistics Vol.36 No.1
This study simultaneously explores the effects of “consolidation” and “privatization” of ports that are located in proximity to one another. The main benefit of consolidation is assumed to be economies of scale due to the aggregation of container cargo in one port, while that of privatization is cost reduction for port management and operations. We employ a multi-agent simulation model to express interactions among stakeholders, such as a port management body, shipping company, and shipper. The model is applied to a case study for the Kobe and Osaka ports in Japan. We find that consolidation has a larger impact than privatization in terms of cargo volume and total surplus. In particular, if future container cargo increases, consolidation accelerates the increase in cargo volume of the Kobe and Osaka ports. Transshipment cargo receives the largest volume in the case of “consolidation and privatization” when future container demand is increasing. However, the Busan port in South Korea, competitor of the Kobe and Osaka ports for transshipment cargo, would remain dominant even after the consolidation and privatization of the Kobe and Osaka ports, since its vessel frequency would be high in all cases.
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Tagawa Hoshi,Kawasaki Tomoya,Hanaoka Shinya 한국해운물류학회 2021 The Asian journal of shipping and Logistics Vol.37 No.2
Hub-and-spoke (HS) networks are cost-effective because they allow the realization of economies of density. However, the cost of point-to-point (PP) networks may be lower than that of HS networks when certain conditions, such as cargo demand, bunker price, vessel size, and the shippers’ value of time change. This study explores the factors that influence the cost-effectiveness of HS and PP networks. We developed a mixed-integer programming model that allows for bi-level optimization between shipping lines and shippers. As a case study, we applied it to Chinese and Japanese ports, with both HS and PP networks. We found that high cargo demand increases the use of PP networks while enlarging vessel size increases the use of HS networks. These findings enable us to predict the occurrence of hubbing—shifting from a PP to an HS network—and de-hubbing—shifting from an HS to a PP network.
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Chathumi Ayanthi KAVIRATHNA,Tomoya KAWASAKI,Shinya HANAOKA 한국해운물류학회 2018 The Asian journal of shipping and Logistics Vol.34 No.2
The hub port competition has intensified beyond regional boundaries, resulting in the port of Colombo competing with the Southeast Asian hub ports of Singapore, Klang, and Tanjung Pelepas in the transshipment market. This study analyzes the competitiveness of Colombo as a transshipment hub in “hub and spoke” and “relay” networks. Shipping lines evaluate the selection criteria for transshipment hub ports and the performance of competitive hub ports. The generalized cost approach together with a discrete choice model is used to assess port choice behavior by estimating the transshipment market share of hub ports and analyzing several scenarios. The results reveal Colombo’s lack of competitiveness in relay networks and most of the feeder ports in hub and spoke networks, mainly due to its high deviation from trunk sea routes and lower performance in some non-quantitative criteria. Singapore has dominant market share in relay networks and for most feeder ports in hub and spoke networks, mainly due to its high performance in non-quantitative criteria, except Pipavav and Nhava Sheva, dominated by Colombo.
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