Browsing by Author "Hsu, Chaug-Ing"

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A dynamic marketing model for hybrid electric vehicles: A case study of Taiwan
(2013-05-01)
Hsu, Chaug-Ing
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Li, Hui-Chieh
;
Lu, Shan-Mei
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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 uses an integrated model utilizing a small-world network and choice-based conjoint adoption model to examine the dynamics of consumer choice and diffusion in the hybrid electric vehicles market. It specifically compares the effectiveness of hybrid diffusion through the traditional word of mouth and via social media. The results show that without the advantage of increased gasoline prices, the growth of the hybrid vehicles market is insignificant, and that the Internet has a significant influence on the word of mouth effect in the purchasing process. Hybrid electric vehicles market shares decrease dramatically as a result of negative word of mouth communication via social media. The use of a higher fuel taxes is more effective than providing a subsidy for disposing of old vehicles and purchasing a hybrid. (c) 2013 Elsevier Ltd. All rights reserved.
A Grey hybrid model with industry share for the forecasting of cargo volumes and dynamic industrial changes
(2020-01-02)
Hsu, Chaug-Ing
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Huang, Yu-Che
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Wong, Ka Io
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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
The importance of ocean shipping for international trade forecasting is growing due to the specialization and evolution of industrial sectors around the world. Classic approaches for cargo volume forecasting, such as time series and casual methods, may have poor performances if the data size is small with large fluctuations. This study proposes a hybrid forecasting model based on the Grey forecasting models and an industry share transformation technique. The hybrid model is particular useful for problems when there are dynamic changes in the industry share and the sample size in historical dataset is small. Using a case study of cargo export and import by industry between Taiwan and North American, the proposed model shows good forecasting performances. The findings can be useful for the marine carriers in responding to the dynamic industrial changes.
A model for facilities planning for multi-temperature joint distribution system
(2011-12-01)
Hsu, Chaug-Ing
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Liu, Kang-Po
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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
New technologies, such as replaceable cold accumulation and insulation box multi-temperature joint distribution (MTJD), provide precise temperature control, thereby reducing negative effects on food quality from exposure to extreme temperatures. This study compares conventional technologies with new ones, and constructs a binary integer-programming model to determine multi-temperature logistics techniques and food handling volume required for maximization of cost-efficiency in a hierarchical hub and spoke (H/S) network. It does so by minimizing the total delivery cost, comprised of terminal, food handling, and vehicle transportation costs computed, separately, by a derived algorithm. Appropriate technique(s) and handling volume for each terminal and vehicle routing are solved by Branch & Bound method, under the "best-first search" principle. The results indicate the model is feasible for facilities planning for MTJD. The replaceable cold accumulation and insulation box MTJD technique is suitable for operation networks with densely distributed terminals and uneven temporal and/or spatial demand distribution. (C) 2011 Elsevier Ltd. All rights reserved.
A model for operational planning for multi-temperature joint distribution system
(2008)
Hsu, Chaug-Ing
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Liu, Kang-Po
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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
A study on airlines' differentiated cargo service strategies
(2013-01-01)
Hsu, Chaug-Ing
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Chen, Yu-Hua
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Chen, Wei-Ting
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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 analyzes how an airline operates differentiated cargo services to meet shipping demand for different goods so as to enhance its service level, air freight demand, and total profit. The shipping alternative choice model assumes shippers with different demand characteristics choose the alternative with the lowest transportation and inventory costs between express and standard shipping services offered by different airlines. The study then formulates airline cost functions with respect to providing standard and express services. Furthermore, the study explores demand-supply interactions and constructs a mathematical programming model to determine flight frequencies and shipping charges for standard and express services by maximizing the object airline's total profit. The results show that those shipping high-value freights tend to select express shipping services and, for the object airline, operating differentiated cargo services rather than the current standard services can raise its market share and total profit by 19.4% and 8.6%, respectively. Moreover, for perishable goods stored in lower temperature-control devices, the charges should be higher. The results also show that not only airlines, but also shippers, can markedly reduce their costs and enhance their competitive advantages with express shipping services. (C) 2012 Elsevier Ltd. All rights reserved.
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.
Airline network design and adjustment in response to fluctuation in jet fuel prices
(2013-12-01)
Hsu, Chaug-Ing
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Eie, Wei-Yin
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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 develops a series of models to determine aircraft types and flight frequencies on individual routes, and evaluate the reliability of proposed network planning during fluctuations in jet fuel prices. The reliability of individual routes is evaluated as to whether revenues from flights with initially proposed flight frequencies and aircraft types can accommodate variations in jet fuel expenditures. We define reliability as the probability that the proposed flight frequencies will operate in at least a break-even condition under future fuel price fluctuations. A case study is provided using an international airline in Taiwan to evaluate its network reliability in response to jet fuel price fluctuations in 2008. The results indicate that not only do routes with low load factors show low reliability, but long distance routes with high load factors also show low reliability during periods with high fuel prices. The results of the study provide effective ways to enhance commercial airline network designs in response to the uncertainty of jet fuel prices. (C) 2013 Elsevier Ltd. All rights reserved.
An energy expenditure approach for estimating walking distance
(2014)
Hsu, Chaug-Ing
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Tsai, Yau-Ching
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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
A walking distance of approximately a quarter mile is normally used as an estimate of willingness to walk when planning a pedestrian-related infrastructure. However, there are variations in walking distance across pedestrian environments, yet there is scant empirical literature on the subject. In this study we propose an energy-based approach to aid the planner in establishing reasonable walking distances while taking into account the effect of pedestrian environment quality. The Pandolf et al model (Pandolf et al, 1977 Journal of Application Physiology 44 577-581) is used to analyze the walking energy expenditure (WEE). The terrain factor is adjusted using the calibrated regression function to fit the urban street space in the experiment. A goodness-of-fit test for the 385 WEEs surveyed suggests a gamma distribution. Using the isoenergy curves, walking distances are shown according to energy level, street type, and gender in order to improve the traditional single measure. The results of this study suggest that, instead of a concentric pattern, the pattern of accessible walking distance around a service facility should be designed based on the service contour lines which take into account the different pedestrian environments.
An integrated plant capacity and production planning model for high-tech manufacturing firms with economies of scale
(2009-04-01)
Hsu, Chaug-Ing
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Li, Hui-Chieh
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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 developed a nonlinear mixed integer programming (MIP) model for high-tech manufacturer to determine the optimal supply chain network design. The impacts of economies of scale on the optimal capacity and the production amount are also explored. A heuristic solution approach, based on simulated annealing (SA), is developed to solve the optimal problem. An example of a wafer foundry company is provided to demonstrate the application of the model. Results show that when determining the production amount for multiple plants, a large-sized capacity plant with low capital costs and low production costs has a high priority for fulfilling the capacity due to not only having the higher capability to satisfy the customer demand but also the advantage of saving costs. The results show that the benefits brought about by centralized production are larger than the increased transportation cost. The results also show without using many small-sized capacity plants combined with high utilization, operating few larger-sized capacity plants with lower utilization is more cost effective for the manufacturer as long as the customer demand is large enough to offset the high capital cost (C) 2009 Elsevier B.V. All rights reserved.
Applying RFID to reduce delay in import cargo customs clearance process
(2009-09-01)
Hsu, Chaug-Ing
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Shih, Hsien-Hung
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Wang, Wei-Che
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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
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.
CBD oriented commuters' mode and residential location choices in an urban area with surface streets and rail transit lines
(2006-12-01)
Hsu, Chaug-Ing
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Guo, Shwu-Ping
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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 formulates a commuters' mode and route choice model as well as a households' residential choice model on a two-dimensional space. The commuters' mode and route choice model assumes that commuters select the mode and route alternative based on the least generalized travel cost. The households' residential choice model is formulated to maximize households' residential utilities subject to time and budget constraints. A simulation method is adopted to simulate household choice behavior and solve the households' residential location choice model with two-dimensional decision variables to prevent aggregation bias. A case study for Taipei metropolitan area is illustrated to analyze the variations of residential location choices for households working in the central business district (CBD) after different lines of Taipei Rapid Transit System are completed at various stages. Results indicate that (1) there is increased attraction of households in cities of Taipei County such as Pan-Chiao, Chung-Ho, Yong-Her, and Hsin-Tien due to the completion of rail transit networks and (2) residential locations better served by rail transit lines attract more households; thereby, resulting in higher residential densities.
Contagion Effect in International Trade After the Japanese 311 Earthquake
(2018-01-01)
Huang, Yu-Che
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Hsu, Chaug-Ing
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Wong, K. I.
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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 investigates spatial contagion on trading markets when an industrialized country is stricken by a natural disaster. We present a test for contagion effects on the cargo trading among the major trading partners. The test is based on a comparison of the correlation coefficients of transnational trade linkages in industrial cargo volumes before and after a disaster. Using the Japanese 311 earthquake in 2011 as a case study, the results show that spatial contagion is observed for neighboring countries exporting to Taiwan. It also found that the occurrence of contagion effect depends on the industrial market share of the linkages, and the contagion effect disperses over time.
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.
Greenhouse gas emission estimation for temperature-controlled food distribution systems
(2015-10-01)
Chen, Wei-Ting
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Hsu, Chaug-Ing
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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
Greenhouse gas (GHG) emissions from food transportation include emissions from energy consumption and refrigerant leakage into the environment. The hydrofluorocarbons (HFCs) and perflourocarbons (PFCs) generated by refrigerant leakage markedly increase global warming (GW). The issue of emissions from temperature-controlled food delivery is important for carriers. This paper aims to estimate GHG emissions from the Traditional Multi-Vehicle Distribution (TMVD) and Multi-Temperature Joint Distribution (MTJD) systems by formulating mathematical models that consider delivery scheduling for time-dependent demand of multi-temperature foods. Furthermore, this paper analyzes and compares the emissions from each source in the two systems to explore the influence of delivery scheduling on emissions. The results indicate that, as compared to the TMVD system, the MTJD system yields less total emissions by lowering fuel consumption even when it generates more GHG due to refrigerant leakage and electric power consumption for freezers, which accounts for an extremely low percentage of total emissions. This paper suggests carriers should use the MTJD system to reduce routing distances and emissions simultaneously. (C) 2015 Elsevier Ltd. All rights reserved.
Impacts of Transportation External Cost Pricing and Transit Fare Reductions on Household Mode/Route Choices and Environmental Improvements
(2010-12-01)
Guo, Shwu-Ping
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Hsu, Chaug-Ing
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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 how transportation external cost pricing and transit fare reductions impact household mode/route choices and environmental improvements in a metropolitan area. A household mode/route choice model and a bilevel model for transportation external cost pricing and transit fare reductions are sequentially constructed. In the first level of bilevel model, the pricing of transportation external costs, including congestion, air pollution, and noise, is measured applying the theory of marginal-cost pricing. The effects of transportation external cost pricing are analyzed in terms of variations in household mode/route choices, increased patronage of rail transit lines and reduced congestion, air pollution, and noise. In the second level of bilevel model, this study explores how to reduce rail transit fares to achieve equivalent benefits of environmental improvement as for the strategy of transportation external cost pricing. The analytical results reveal that, after the implementation of transportation external cost pricing and taxation, the number of commuting households attracted to rail transit lines will increase, and some commuting households may detour to more distant transit stations to avoid high congestion links on surface streets.
Impacts of Transportation External Cost Pricing and Transit Fare Reductions on Household Mode/Route Choices and Environmental Improvements
(2010-12-01)
Guo, Shwu-Ping
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Hsu, Chaug-Ing
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運輸與物流管理系註：原交通所+運管所
;
Department of Transportation and Logistics Management
This study explores how transportation external cost pricing and transit fare reductions impact household mode/route choices and environmental improvements in a metropolitan area. A household mode/route choice model and a bilevel model for transportation external cost pricing and transit fare reductions are sequentially constructed. In the first level of bilevel model, the pricing of transportation external costs, including congestion, air pollution, and noise, is measured applying the theory of marginal-cost pricing. The effects of transportation external cost pricing are analyzed in terms of variations in household mode/route choices, increased patronage of rail transit lines and reduced congestion, air pollution, and noise. In the second level of bilevel model, this study explores how to reduce rail transit fares to achieve equivalent benefits of environmental improvement as for the strategy of transportation external cost pricing. The analytical results reveal that, after the implementation of transportation external cost pricing and taxation, the number of commuting households attracted to rail transit lines will increase, and some commuting households may detour to more distant transit stations to avoid high congestion links on surface streets.
Interactive multiobjective programming in airline network design for international airline code-share alliance
(2006-10-01)
Wen, Yuh-Horng
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Hsu, Chaug-Ing
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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 presents an interactive airline network design procedure to facilitate bargaining interactions necessitated by international code-share alliance agreements. Code sharing involves partner airlines individually maximizing their own profits, while mutually considering overall profitability, traffic gains, and quality benefits for the markets in which they cooperate with their partners. This study uses a reference point method to solve the interactive multiobjective programming model, to support the bargaining interactions between two partner-airlines in an alliance negotiation. The impact of the code-share alliance network on market demand, alliance partners' costs and profits, and levels of service are also discussed. A case study demonstrates the feasibility of applying the proposed models and elucidates how interactive multiobjective programming models may be applied to determine flight frequencies for airline code-share alliance networks. The results of this study provide ways by which alliance airlines can evaluate iteratively the output and profits of the alliance members under code-share alliance agreements. (c) 2005 Elsevier B.V. All rights reserved.
Intertemporal demand for international tourist air travel
(2013-05-01)
Hsu, Chaug-Ing
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Li, Hui-Chieh
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Yang, Li-Hung
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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 investigated dynamic international tourism travel demand by constructing an intertemporal travel choice model. In the model, the utility functions comprise two factors: individuals' ability to travel and external environmental factors in different years. Individuals are assumed to pursue a maximised aggregated utility, with various discounts on past and future years subject to time and budget constraints. A questionnaire was designed to calibrate and explore individuals' preferences for international tourism travel from Taiwan. The study collected historic data over the past decade to estimate parameter values for the external environmental factor. The variables, such as travel budget, holiday and vacation days, travel expense and number of travel days are shown to significantly affect individual travel demand. The results support the argument that negative external events, such as an emerging influenza pandemic or economic crisis, have an adverse impact on international travel demand. Moreover, the utility of past travel experience declines at a slower rate than that of expected future travel. The findings imply that past travel experience has an unexpectedly strong impact on future travel decisions. The results also show that travellers tend not to travel until their saving budget has accumulated enough to cover travel expenses. Travellers with high incomes in Taiwan could undertake outbound international travel almost every year.