The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Xiang Zhang - One of the best experts on this subject based on the ideXlab platform.
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optimal new energy vehicle Production Strategy considering subsidy and shortage cost
Energy Procedia, 2015Co-Authors: Xiang Zhang, Chunye ZhangAbstract:Abstract In this paper, we present an analytical model to investigate how the optimal Production Strategy of new energy vehicles (NEVs) is influenced by subsidy, market fluctuation, and loss aversion. We find that a loss averse decision maker may produce more Production quantity than the optimal quantity in risk neutrality under the certain conditions. We demonstrate that the expected utility is substantially influenced by subsidy, loss aversion, and the shortage cost. Although the relationship between subsidy and loss aversion is not straightforward when considering shortage cost, subsidy may play a role to regulate the possible overages and shortages in NEV manufacturing. Implications to both policy makers and practitioners are discussed.
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reference dependent electric vehicle Production Strategy considering subsidies and consumer trade offs
Energy Policy, 2014Co-Authors: Xiang ZhangAbstract:Abstract In this paper, we extend previous reference-dependence newsvendor research by incorporating both consumer trade-offs and government subsidies to evaluate the relevant influences on the optimal electric vehicle (EV) Production decisions. We present the properties of the model, derive the closed-form solutions for the model given the relevant constraints, and use numerical experiments to illustrate the results. We find that subsidies, loss aversion, the performance of both EVs and internal combustion engine-powered vehicles (ICEVs), and the coefficient of variation of demand are significant factors influencing the optimal Production quantity and the expected utilities of EV Production. The high selling price and other high costs of ICEVs help offset the influence of loss aversion, whereas the high costs of EV enhance loss aversion. Our study enriches the literature on subsidies for EVs by establishing a behavioral model to incorporate the decision bias in terms of loss aversion at the firm level. These findings provide guiding principles for both policymakers and EV managers for making better strategies to promote EVs in the early immature market.
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reference dependent electric vehicle Production Strategy considering subsidies and consumer trade offs
Social Science Research Network, 2013Co-Authors: Xiang ZhangAbstract:In this paper, we extend previous reference-dependence newsvendor research by incorporating both consumer trade-offs and government subsidies to evaluate the relevant influences on the optimal EV Production decisions. We present the properties of the model, derive the closed-form solutions for the model given the relevant constraints, and use numerical experiments to illustrate the results. We find that subsidies, loss aversion, the performance of both EVs and ICEVs, and the coefficient of variation of demand are significant factors influencing the optimal Production quantity and the expected utilities of EV Production. The high selling price and other high costs of ICEVs help offset the influence of loss aversion, whereas the high costs of EV enhance loss aversion. Our study enriches the literature on subsidies for EVs by establishing a behavioral model to incorporate the decision bias in terms of loss aversion at the firm level. These findings provide guiding principles for both policy makers and EV managers for making better strategies to promote EVs in the early immature market.
Yoshihito Shirai - One of the best experts on this subject based on the ideXlab platform.
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open fermentative Production of l lactic acid with high optical purity by thermophilic bacillus coagulans using excess sludge as nutrient
Bioresource Technology, 2014Co-Authors: Toshinari Maeda, Huiyan You, Yoshihito ShiraiAbstract:The development of a low-cost polymer-grade L-lactic acid Production process was achieved in this study. Excess sludge hydrolyzate (ESH) was chosen as nutrient source for the objective of reducing nutrient cost in lactic acid Production. 1% of ESH had high performance in lactic acid Production relative to 2g/l yeast extract (YE) while the Production cost of ESH was much lower than that of YE, indicating ESH was a promising substitute of YE. By employing a thermophilic strain of Bacillus coagulans (NBRC 12583), non-sterilized batch and repeated batch L-lactic acid fermentation was successfully performed, and the optical purity of L-lactic acid accumulated was more than 99%. Moreover, the factors associated with cell growth and lactic acid fermentation was investigated through a two-stage lactic acid Production Strategy. Oxygen played an important role in cell growth, and the optimal condition for cell growth and fermentation was pH 7.0 and 50°C.
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open fermentative Production of l lactic acid with high optical purity by thermophilic bacillus coagulans using excess sludge as nutrient
Bioresource Technology, 2014Co-Authors: Toshinari Maeda, Yoshihito ShiraiAbstract:Abstract The development of a low-cost polymer-grade l -lactic acid Production process was achieved in this study. Excess sludge hydrolyzate (ESH) was chosen as nutrient source for the objective of reducing nutrient cost in lactic acid Production. 1% of ESH had high performance in lactic acid Production relative to 2 g/l yeast extract (YE) while the Production cost of ESH was much lower than that of YE, indicating ESH was a promising substitute of YE. By employing a thermophilic strain of Bacillus coagulans (NBRC 12583), non-sterilized batch and repeated batch l -lactic acid fermentation was successfully performed, and the optical purity of l -lactic acid accumulated was more than 99%. Moreover, the factors associated with cell growth and lactic acid fermentation was investigated through a two-stage lactic acid Production Strategy. Oxygen played an important role in cell growth, and the optimal condition for cell growth and fermentation was pH 7.0 and 50 °C.
C K Kwong - One of the best experts on this subject based on the ideXlab platform.
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an improvement on integrated Production Strategy and reuse scenario a cofaq model and case study of mail server system development
Omega-international Journal of Management Science, 2015Co-Authors: Jiafu Tang, C K Kwong, F MarinelliAbstract:The authors (Tang et al. (2013) [1] developed a CoFAQ model to formulate a solution for the problem of Production Strategy decision and reuse scenario selection for a software product family. In the previous research, we stated that the CoFAQ model was a 0–1 mixed integer nonlinear program, where only a local optimal solution might be found. In a recent study, we found that the CoFAQ could be transformed into a 0–1 mixed integer linear programming model. By solving the model, a global optimal solution can be obtained. In this paper, we present the improved formulation and the optimal solution for the case study.
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integrated Production Strategy and reuse scenario a cofaq model and case study of mail server system development
Omega-international Journal of Management Science, 2013Co-Authors: Jiafu Tang, Wu Zhiqiao, C K KwongAbstract:One of the core problems in software product family (SPF) is the coordination of product building and core asset development, specifically the integration of Production Strategy decision and core asset scenario selection. In the current paper, a model of Cost Optimization under Functional And Quality (CoFAQ) goal satisfaction constraints is developed. It provides a systematic mechanism for management to analyze all possible products and evaluate various reuse alternatives at the organizational level. The CoFAQ model facilitates decision-makers to optimize the SPF development process by determining which products are involved in the SPF (i.e. Production Strategy) and which reuse scenario for each module should be selected to implement the SPF toward minimum total developing cost under the constraints of satisfying functional and quality goals. A two-phase algorithm with heuristic (TPA) is developed to solve the model efficiently. Based on the TPA, the CoFAQ is reduced to a weighted set-covering problem for Production Strategy decision and a knapsack problem for the reuse scenario selection. An application of the model in mail server domain development is presented to illustrate how it has been used in practice.
Toshinari Maeda - One of the best experts on this subject based on the ideXlab platform.
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open fermentative Production of l lactic acid with high optical purity by thermophilic bacillus coagulans using excess sludge as nutrient
Bioresource Technology, 2014Co-Authors: Toshinari Maeda, Huiyan You, Yoshihito ShiraiAbstract:The development of a low-cost polymer-grade L-lactic acid Production process was achieved in this study. Excess sludge hydrolyzate (ESH) was chosen as nutrient source for the objective of reducing nutrient cost in lactic acid Production. 1% of ESH had high performance in lactic acid Production relative to 2g/l yeast extract (YE) while the Production cost of ESH was much lower than that of YE, indicating ESH was a promising substitute of YE. By employing a thermophilic strain of Bacillus coagulans (NBRC 12583), non-sterilized batch and repeated batch L-lactic acid fermentation was successfully performed, and the optical purity of L-lactic acid accumulated was more than 99%. Moreover, the factors associated with cell growth and lactic acid fermentation was investigated through a two-stage lactic acid Production Strategy. Oxygen played an important role in cell growth, and the optimal condition for cell growth and fermentation was pH 7.0 and 50°C.
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open fermentative Production of l lactic acid with high optical purity by thermophilic bacillus coagulans using excess sludge as nutrient
Bioresource Technology, 2014Co-Authors: Toshinari Maeda, Yoshihito ShiraiAbstract:Abstract The development of a low-cost polymer-grade l -lactic acid Production process was achieved in this study. Excess sludge hydrolyzate (ESH) was chosen as nutrient source for the objective of reducing nutrient cost in lactic acid Production. 1% of ESH had high performance in lactic acid Production relative to 2 g/l yeast extract (YE) while the Production cost of ESH was much lower than that of YE, indicating ESH was a promising substitute of YE. By employing a thermophilic strain of Bacillus coagulans (NBRC 12583), non-sterilized batch and repeated batch l -lactic acid fermentation was successfully performed, and the optical purity of l -lactic acid accumulated was more than 99%. Moreover, the factors associated with cell growth and lactic acid fermentation was investigated through a two-stage lactic acid Production Strategy. Oxygen played an important role in cell growth, and the optimal condition for cell growth and fermentation was pH 7.0 and 50 °C.
Jiafu Tang - One of the best experts on this subject based on the ideXlab platform.
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an improvement on integrated Production Strategy and reuse scenario a cofaq model and case study of mail server system development
Omega-international Journal of Management Science, 2015Co-Authors: Jiafu Tang, C K Kwong, F MarinelliAbstract:The authors (Tang et al. (2013) [1] developed a CoFAQ model to formulate a solution for the problem of Production Strategy decision and reuse scenario selection for a software product family. In the previous research, we stated that the CoFAQ model was a 0–1 mixed integer nonlinear program, where only a local optimal solution might be found. In a recent study, we found that the CoFAQ could be transformed into a 0–1 mixed integer linear programming model. By solving the model, a global optimal solution can be obtained. In this paper, we present the improved formulation and the optimal solution for the case study.
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integrated Production Strategy and reuse scenario a cofaq model and case study of mail server system development
Omega-international Journal of Management Science, 2013Co-Authors: Jiafu Tang, Wu Zhiqiao, C K KwongAbstract:One of the core problems in software product family (SPF) is the coordination of product building and core asset development, specifically the integration of Production Strategy decision and core asset scenario selection. In the current paper, a model of Cost Optimization under Functional And Quality (CoFAQ) goal satisfaction constraints is developed. It provides a systematic mechanism for management to analyze all possible products and evaluate various reuse alternatives at the organizational level. The CoFAQ model facilitates decision-makers to optimize the SPF development process by determining which products are involved in the SPF (i.e. Production Strategy) and which reuse scenario for each module should be selected to implement the SPF toward minimum total developing cost under the constraints of satisfying functional and quality goals. A two-phase algorithm with heuristic (TPA) is developed to solve the model efficiently. Based on the TPA, the CoFAQ is reduced to a weighted set-covering problem for Production Strategy decision and a knapsack problem for the reuse scenario selection. An application of the model in mail server domain development is presented to illustrate how it has been used in practice.
