[Fu, Zhuo] C;Cent S Univ, Sch Traff & Transportat Engn, Changsha 410075, Hunan, Peoples R China.
Routing;Pickup and delivery;Discrete split;Tabu search
The Vehicle Routing Problem with Discrete Split Deliveries and Pickups is a variant of the Vehicle Routing Problem with Split Deliveries and Pickups, in which customers' demands are discrete in terms of batches (or orders). It exists in the practice of logistics distribution and consists of designing a least cost set of routes to serve a given set of customers while respecting constraints on the vehicles' capacities. In this paper, its features are analyzed. A mathematical model and Tabu Search algorithm with specially designed batch combination and item creation operation are proposed. The batch combination operation is designed to avoid unnecessary travel costs, while the item creation operation effectively speeds up the search and enhances the algorithmic search ability. Computational results are provided and compared with other methods in the literature, which indicate that in most cases the proposed algorithm can find better solutions than those in the literature. (C) 2018 Published by Elsevier Ltd.
Urban clusters are important carriers for cities to participate in international competition and cooperation, and a booster for urban sustainable development. This study measured the degree of urban clusters by utilizing the panel data of 278 cities in China during 2004-2016. Then, an extended meta-frontier data envelopment analysis (EM-DEA) model was applied to estimate the total-factor ecological performance (UTEP) and decompose it into two sub-index from the perspective of "resource conservation" and "environmental friendliness". On these bases, we employed a dynamic panel data approach to examine and demonstrate the relationship between urban cluster and UTEP in two dimensions, and further explored transmission channels of urban clusters on UTEP by adding the mediating effect. The results show that resource conservation increases first and then decreases with the increasing of urban clustering level, while environmental friendliness showed the opposite trend, making the latter become the main way for urban clusters to improve the UTEP. Industrial structure supererogation and rationalization are transmission channels for environmental friendliness rather than resource conservation in the way of improvement of UTEP. Technology innovation, as well as technology diffusion, also improves UTEP to some extent. In addition, urban clusters in eastern and central China have the greatest improvement in UTEP, while such effects are not the case in western China. Urban clusters in the second half sample period are more conducive to the improvement of the UTEP, with these potentially being the gains from the improvement of the level and quality of urban clusters.
A kind of coenzyme A (CoA)-silver coordination complex (CoA-Ag) was in-situ developed and verified to accelerate the electron transferring and electrochemical catalysis of H2O2 decomposition to enhance the cathode ECL intensity of CdTe@CdS QDs. Afterward, a convenient label-free signal-on ECL approach was constructed for CoA detection with excellent specificity. In addition, the unique ECL enhancing phenomenon was also proposed to assay the enzymatic activity of histone acetyltransferases (HAT) and screen relevant inhibitors, exhibiting a promising potential in the practical application of biochemical research, disease diagnosis and drug discovery.
Journal of Electronic Commerce Research,2020年21(2):75-95 ISSN：1526-6133
[Li, Xinchen] Hengyang Normal Univ, Coll Econ & Management, Hengyang, Hunan, Peoples R China.;[Liao, Qinyu] Univ Texas Rio Grande Valley, Robert C Vackar Coll Business & Entrepreneurship, Brownville, TX USA.;[Luo, Xin (Robert)] Univ New Mexico, Anderson Sch Management, Albuquerque, NM 87131 USA.;[Wang, Yaoyu] Soochow Univ, Dongwu Sch Business, Suzhou, Jiangsu, Peoples R China.
Social media;Cognitive reputation;Affective reputation;Interaction Experience;Utilitarian value;Hedonic value
E-commerce enterprises use different social media channels to build their online reputation through customers' rich interaction experiences, but no study has differentiated the individual impact of consumer-to-consumer and business-to-consumer interaction features on e-commerce online reputations. This study investigates the linkage between five interaction characteristics, consumers' perceived values, and e-commerce online reputations. The results of our study show that only the perceived hedonic value has a significant influence on e-commerce online reputations. Perceived control, reciprocity, and responsiveness have a positive and significant influence on both perceived utilitarian value and perceived hedonic value. Sociability only shows a significant and negative influence on perceived utilitarian value. Personalization has a significant and positive influence on utilitarian value only. Perceived hedonic value mediates the influence of three interaction features (perceived control, reciprocity, and responsiveness) on both e-commerce cognitive and affective reputations. The implications of the study for research and practice are discussed.
[Tang, Qiong; Fu, Zhuo; Zhang, Dezhi] Cent South Univ, Sch Traff & Transportat Engn, Changsha 410075, Peoples R China.;[Tang, Qiong] Hengyang Normal Univ, Coll Econ & Management, Hengyang 421002, Peoples R China.;[Tang, Qiong; Fu, Zhuo; Zhang, Dezhi] Smart Transport Key Lab Hunan Prov, Changsha 410075, Peoples R China.;[Guo, Hao] Jinan Univ, Sch Management, Guangzhou 510632, Peoples R China.;[Li, Minyi] RMIT Univ, Sch Sci, Melbourne, Vic 3000, Australia.
[Fu, Zhuo] C;[Fu, Zhuo] S;Cent South Univ, Sch Traff & Transportat Engn, Changsha 410075, Peoples R China.;Smart Transport Key Lab Hunan Prov, Changsha 410075, Peoples R China.
In this paper, a bike repositioning problem with stochastic demand is studied. The problem is formulated as a two-stage stochastic programming model to optimize the routing and loading/unloading decisions of the repositioning truck at each station and depot under stochastic demands. The goal of the model is to minimize the expected total sum of the transportation costs, the expected penalty costs at all stations, and the holding cost of the depot. A simulated annealing algorithm is developed to solve the model. Numerical experiments are conducted on a set of instances from 20 to 90 stations to demonstrate the effectiveness of the solution algorithm and the accuracy of the proposed two-stage stochastic model.
[Yang, Yuxiang] Hengyang Normal Univ, Dept Econ & Management, Hengyang 421002, Hunan, Peoples R China.
2015 3rd International Conference on Machinery,Materials and Information Technology Applications(ICMMITA 2015)
Low-carbon City;AHP (analytic hierarchy process);TOPSIS (Technique for Order Preference by Similarity to Ideal Solution)
The AHP(analytic hierarchy process) and TOPSIS(Technique for Order Preference by Similarity to Ideal Solution) are applied to evaluate low-carbon urban development level of 14 prefecture-level cities