Browsing by Author "Shih, Hsien-Hung"

Now showing 1 - 3 of 3

Applying RFID to reduce delay in import cargo customs clearance process
(2009-09-01)
Hsu, Chaug-Ing
;
Shih, Hsien-Hung
;
Wang, Wei-Che
;
運輸與物流管理系註：原交通所+運管所
;
Department of Transportation and Logistics Management
The study explores the customs clearance process of import cargos in international air cargo terminals, and constructs a network to analyze cargo, information and human flows in the import cargo process. Then, the study formulates a mathematical model of the customs clearance process-delay, and analyzes delay propagation in subsequent cargos. Moreover, the network of the customs clearance process is reconstructed based on the application of Radio Frequency Identification (RFID). The performances of RFID are evaluated in terms of reductions in shippers' inventory cost and operators' labor cost. A numerical example of Taiwan Air Cargo Terminal (TACT) at the Chiang Kai-shek (CKS) International Airport is used to illustrate the feasibility of the proposed model. The analysis of cargo processing at TACT shows that cargos arriving earlier at TACT take less waiting time and less clearance time than ones arriving later. RFID application can markedly improve the efficiency of cargo process, and can save the inventory cost and labor cost. A combined strategy that carries out a modified dispatching rule and RFID application at the same time brings the greatest benefit to TACT. The sensitivity analyses show that the total benefit of applying RFID increases as cargo delay cost, terminal handling capacity, and/or storage cost increase, indicating that RFID technology is appropriate for handling those cargos with high value of time. (C) 2008 Elsevier Ltd. All rights reserved.
Small-world network theory in the study of network connectivity and efficiency of complementary international airline alliances
(2008-05-01)
Hsu, Chaug-Ing
;
Shih, Hsien-Hung
;
運輸與物流管理系註：原交通所+運管所
;
Department of Transportation and Logistics Management
This paper investigates the network connectivity and efficiency of international airline alliances, and conceptually applies the shortcuts of small-world networks to analyze alliance routes. Based on travel time, mobility and accessibility models are formulated to evaluate the effects of alliance on network connectivity. The results show that the connectivity of the alliance network is better than before, and the alliance effectively improves accessibility from high-medium traffic airports to low traffic airports. After the alliance, the shortest paths between origin-destination pairs will involve more transfers but less travel time. (C) 2008 Elsevier Ltd. All rights reserved.
Transmission and control of an emerging influenza pandemic in a small-world airline network
(2010-01-01)
Hsu, Chaug-Ing
;
Shih, Hsien-Hung
;
運輸與物流管理系註：原交通所+運管所
;
Department of Transportation and Logistics Management
The avian influenza virus H5N1 and the 2009 swine flu HIM are potentially serious pandemic threats to human health, and air travel readily facilitates the spread of infectious diseases. However, past studies have not yet incorporated the effects of air travel on the transmission of influenza in the construction of mathematical epidemic models. Therefore, this paper focused on the human-to-human transmission of influenza, and investigated the effects of air travel activities on an influenza pandemic in a small-world network. These activities of air travel include passengers' consolidation, conveyance and distribution in airports and flights. Dynamic transmission models were developed to assess the expected burdens of the pandemic, with and without control measures. This study also investigated how the small-world properties of an air transportation network facilitate the spread of influenza around the globe. The results show that, as soon as the influenza is spread to the top 50 global airports, the transmission is greatly accelerated. Under the constraint of limited resources, a strategy that first applies control measures to the top 50 airports after day 13 and then soon afterwards to all other airports may result in remarkable containment effectiveness. As the infectiousness of the disease increases, it will expand the scale of the pandemic, and move the start time of the pandemic ahead. (C) 2009 Elsevier Ltd. All rights reserved.