Browsing by Author "Chao, Ching-Cheng"

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Aircraft replacement scheduling: A dynamic programming approach
(2011-01-01)
Hsu, Chaug-Ing
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Li, Hui-Chieh
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Liu, Su-Miao
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Chao, Ching-Cheng
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運輸與物流管理系註：原交通所+運管所
This study developed a stochastic dynamic programming model to optimize airline decisions regarding purchasing, leasing, or disposing of aircraft over time. Grey topological models with Markov-chain were employed to forecast passenger traffic and capture the randomness of the demand. The results show that severe demand fluctuations would drive the airline to lease rather than to purchase its aircrafts. This would allow greater flexibility in fleet management and allows for matching short-term variations in the demand. The results of this study provide a useful reference for airlines in their replacement decision-making procedure by taking into consideration the fluctuations in the market demand and the status of the aircraft. (c) 2010 Elsevier Ltd. All rights reserved.
Control strategies for departure process delays at airport passenger terminals
(2015-02-17)
Hsu, Chaug-Ing
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Chao, Ching-Cheng
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Hsu, Nai-Wen
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運輸與物流管理系註：原交通所+運管所
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Department of Transportation and Logistics Management
This paper explores the characteristics of process delays at airport passenger terminals and establishes a queuing model for both passengers and baggage served by different connecting type facilities. The impact of delay propagation on other processes and flights is investigated using an analytical approach. In addition, the extra costs incurred on passengers, process operators, and airlines are examined using the delay cost functions. To reduce the impact of process delays, various delay-controlled strategies are proposed, such as setting scheduled times for completion of a process, increasing the number of service counters, and priority service for emergent flights. Taoyuan International Airport in Taiwan is used as a case study when facing special events. Results showed that the model can effectively and efficiently estimate delay propagation and its costs. In addition, processes that are not consecutive allow more buffer time between different operations, which helps ease propagation of delays caused by previous services.
Dynamic allocation of check-in facilities and dynamic assignment of passengers at air terminals
(2012-09-01)
Hsu, Chaug-Ing
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Chao, Ching-Cheng
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Shih, Kun-Yao
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運輸與物流管理系註：原交通所+運管所
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Department of Transportation and Logistics Management
This study explores the dynamic allocation of check-in facilities and dynamic assignment of passengers at air terminals to achieve the objectives of minimizing total waiting time and better utilization of facilities. Taking into consideration different check-in services required by departing passengers, adjustments to allocations are made according to the maximum allowable wait time and the lowest service counter utilization rate allowed for the initial allocation condition. The developed model was validated for its feasibility and applied at the Taoyuan International Airport, Taiwan. The application results showed that dynamic allocation of check-in facilities can both reduce waiting times and increase service counter utilization rates. Such benefits can be further enhanced by dynamic assignment of passengers. (C) 2012 Elsevier Ltd. All rights reserved.
Fleet dry/wet lease planning of airlines on strategic alliance
(2013-08-01)
Hsu, Chaug-Ing
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Chao, Ching-Cheng
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Huang, Peng-Shien
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運輸與物流管理系註：原交通所+運管所
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Department of Transportation and Logistics Management
Airlines form strategic alliances in hope of cost minimisation. This study develops a model that deals with issues regarding fleet purchase, dry/wet leases and disposal of aircraft, taking into consideration the impact of a strategic alliance between airlines on fleet planning. Using dynamic programming to determine the initial optimal number and type of aircraft for dry/wet leasing, purchase and lease, the multi-objective model formulated can achieve minimisation of total fleet planning costs. Further, this study simulates the step-by-step negotiation process between decision-makers of two allied airlines. Through interactive bargaining, the airlines can adjust the alliance-related parameters to narrow the difference in expected profits and reach a final negotiated compromise solution acceptable to both airlines in the strategic alliance. A satisfactory negotiation result aiming for lower post-alliance costs in the best interests of one individual airline may not be the most optimal for the overall interests of the alliance. The sensitivity analysis of aircraft acquisition costs offer airlines a better understanding of the cost range and cost threshold for aircraft owned/held for different durations and acquired by different approaches.