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Search Results: 1 - 10 of 63376 matches for " He XU "
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Cross-Border Electronic Commerce Development Present Situation and the Innovation Research in China  [PDF]
Wenjuan He, Yuming Xu
American Journal of Industrial and Business Management (AJIBM) , 2018, DOI: 10.4236/ajibm.2018.88124
Abstract: With the opening of China’s national gate, China’s economy has entered a stage of rapid development, and the development of cross-border e-commerce is extremely strong, which has greatly impacted and affected the international trade market. The article is organized as follows 3 parts: based on the summary of the new development trend of global e-commerce, this paper analyzes and studies the different aspects of how to conduct innovation in e-commerce according to China’s national conditions and the status quo of China’s e-commerce trade, and finally obtains innovation research in China. The new trend includes innovation of profit model, innovation of marketing model and innovation of supervision mode; China’s e-commerce innovation is characterized by diversified development of profit model, and enhances competitiveness and marketing mode through integration of value-added services with logistics and supply chain. Including B2C mode, direct supply mode, B2B mode and Amazon integration, B2B and B2C access, and the innovation of supervision mode should be the conclusion of the comprehensive management of relevant ministries and commissions, joint management and unblocking of various functional departments.
Tabu Search Solution for Resource Confidence Considered Partner Selection Problem in Cross-Enterprise Project  [PDF]
Hanchuan Xu, Xiaofei Xu, Ting He
Journal of Software Engineering and Applications (JSEA) , 2010, DOI: 10.4236/jsea.2010.36063
Abstract: Cross-enterprise project is the main implementation form in multi enterprises collaborative production environment. Minimizing the risk of failure and tardiness caused by the uncertainty of partner’s resources in partner selection is the key problem to ensure success in Cross-enterprise project. In this paper, considering the factors and constraints of sub-project processing times, precedence of sub-project and project due date, especially the resource confidence, a 0-1 integer programming model was presented with the objective to minimize the risk of failure and the tardiness of the project. A project scheduling algorithm was designed to search and evaluate selection solutions, and the project scheduling algorithm was embedded into a Tabu search algorithm to solve the model. Simulation experiments and comparisons with other algorithms showed that the proposed approach was possible to find the optimal solution with a faster speed and higher probability.
Towards Effective Bus Lane Monitoring Using Camera Sensors  [PDF]
Xu Li, Xuegang Yu, Ke He
Wireless Sensor Network (WSN) , 2011, DOI: 10.4236/wsn.2011.35020
Abstract: City administrators need to guarantee bus priority in urban public transportation. Building large-scale dedicated bus lanes is a cost-effective solution but it suffers from illegal utilization of dedicated bus lines by other non-permitted vehicles. In general, two systems can be utilized for bus lane monitoring: road-side system and bus mounted system. Although the former one has the advantage in terms of larger surveillance coverage, the investment cost makes it less feasible because of scalability issue. In this paper, we focus on bus mounted system to improve surveillance coverage without additional infrastructure cost. We introduce DoubleChecking, a cooperative violator identification scheme that can accurately pick out those non-permitted vehicles or violators. DoubleChecking is designed to improve the surveillance coverage of bus mounted system by using communications/cooperation between mounted camera sensors and existing camera sensors around intersections. Through theoretical analysis and simulation results, we show that DoubleChecking yields good performance for violator identification.
A Longitudinal Study on the Impact of Small-Sized Supporting Objects on Children Behavior  [PDF]
Linlin He, Jinfu Zhang, Xiaochun Xu
Psychology (PSYCH) , 2015, DOI: 10.4236/psych.2015.66070
Abstract: In this study, a preliminary test on 22 Chinese children was conducted. After 11 months, 11 children were successfully re-tested. The results indicated that, whether in body task or object task, children made more scale errors and acts of refusal without reason in the pre-test. Compared with the pre-test, children in the post-test were fully aware of the size of supporting objects, were more likely to refuse with reason, and made active pretending behaviors.
P2P & LBS Technology-Based Mobile Police System Design  [PDF]
Wei Yao, Ping He, Song Xu
Journal of Computer and Communications (JCC) , 2015, DOI: 10.4236/jcc.2015.39006
Abstract: With the coverage by the mobile network and the popularization of mobile phone communication software, the traditional voice communication, short message service and even the interconnection service have gradually been replaced by mobile terminal equipment. Confronted with the ever-increasingly serous information explosion, police authorities meet with new challenges in their daily police work. This paper establishes a mobile police application system integrating office work, early warning, publicity and surveillance through careful study of the Peer to Peer and Location Based technology, striving to transform the traditional idea, break the traditional mode, expand the tradition scope so as to better exercise the social supervision function, publicize precaution information and crack down on crime.
Cr(VI) Removal from Aqueous Solution by Chitosan/Carboxylmethyl Cellulose/Silica Hybrid Membrane  [PDF]
Xuemei He, Huidong Xu, Hui Li
World Journal of Engineering and Technology (WJET) , 2015, DOI: 10.4236/wjet.2015.33C034
Abstract:

In the present study, chitosan/carboxymethyl cellulose/silica hybrid membrane (CS/CMC/Silica) was prepared by using chitosan and carboxymethyl cellulose in the presence of 3-glycidoxypro- pyltrimethoxysilane (GPTMS) as the crosslinking agent and used to remove Cr(VI) iron in effluent. The structure of CS/CMC/Silica hybrid membrane was characterized by FT-IR spectroscopy and scanning electron microscopy (SEM). The influence of Cr(VI) concentration, solution temperature, and pH, adsorption time on adsorption performance of hybrid membrane was investigated. Adsorption capacity increased with the increase of Cr(VI) concentration and absorbing time, and decreased with the increase of sorbent dosage and temperature. The adsorption equilibrium of Cr(VI) ion was attained within 60min of contact. The pseudo-second-order model fitted the kinetic data well.

Adsorption and Transport of Ciprofloxacin in Quartz Sand at Different pH and Ionic Strength  [PDF]
Xiujiao Xu, Jianglong He, Yu Li, Zhaoxi Fang, Shaohui Xu
Open Journal of Soil Science (OJSS) , 2014, DOI: 10.4236/ojss.2014.412041
Abstract: Effects of pH and ionic strength on ciprofloxacin adsorption in quartz sand were studied through a batch equilibrium adsorption experiment in this paper. The experimental data were fitted by empirical formulas from Langmuir and Freundlich adsorption isothermal curves, and the transport experiments in quartz sand at different pH and ionic strength were conducted to investigate the transport characteristics of ciprofloxacin. It was found that with the increase of pH value or ionic strength, adsorption capacity of ciprofloxacin decreased, so that it could move easier. The results indicated that low pH or ionic strength was conductive to the adsorption of ciprofloxacin in quartz sand. Meanwhile, a higher initial concentration or stronger ionic strength could result in a smaller linear distribution coefficient of ciprofloxacin, which meant a low adsorption capacity. According to the fitting results, the adsorption of ciprofloxacin in quartz sand could be described well by both Langmuir and Freundlich equations, of which Freundlich equation had a better efficacy.
Stability and Bifurcation Analysis in a Class of Two-Neuron Networks with Resonant Bilinear Terms
Changjin Xu,Xiaofei He
Abstract and Applied Analysis , 2011, DOI: 10.1155/2011/697630
Abstract: A class of two-neuron networks with resonant bilinear terms is considered. The stability of the zero equilibrium and existence of Hopf bifurcation is studied. It is shown that the zero equilibrium is locally asymptotically stable when the time delay is small enough, while change of stability of the zero equilibrium will cause a bifurcating periodic solution as the time delay passes through a sequence of critical values. Some explicit formulae for determining the stability and the direction of the Hopf bifurcation periodic solutions bifurcating from Hopf bifurcations are obtained by using the normal form theory and center manifold theory. Finally, numerical simulations supporting the theoretical analysis are carried out.
Chaotic-Search-Based Cultural Algorithm for Solving Unconstrained Optimization Problem
Jianjia He,Fuyuan Xu
Modelling and Simulation in Engineering , 2011, DOI: 10.1155/2011/239743
Abstract: For premature convergence and instability of cultural algorithm in solving function optimization problem, based on cultural algorithm and chaos search optimization, a chaos cultural algorithm (CCA) is proposed. The algorithm model consists of a chaos-based population space and a knowledge-storing belief space, uses normative knowledge and situational knowledge for chaos search and chaos perturbation, respectively, effectively avoids premature convergence of cultural algorithm, and overcomes chaos search optimization's sensitivity to initial values and poor efficiency. Test results show that this algorithm is strong in global search and has good performance in searching efficiency, precision, and stability, especially in solving high-dimensional optimization problem. 1. Introduction Since the found of the bionics in the 1950s, people began to simulate the evolution mechanism of creatures and proposed such evolutionary computation approaches as the genetic programming and immune algorithm to solve the optimization problem. These algorithm researches are mainly focused on the level of natural choice. Many practical cases show that culture can make population evolve and adapt to the environment at certain speed beyond the evolutionary speed which is merely based on the genetic inheritance [1]. In the human society, culture is regarded as the store carrier of information which is widely delivered among and inside the social groups and can be inherited by all the social members so as to effectively guide them to solve problems. Enlightened from this, Reynolds put forward a brand-new evolutionary computation of cultural algorithm [1]. The cultural algorithm simulates the evolution from both the macroscopic and microscopic levels which stimulate and influence each other mutually. This algorithm provides a kind of explicit mechanism for acquiring, preserving, and integrating the solution knowledge so as to improve the search efficiency. Nowadays, the cultural algorithm, as the hotspot of the algorithm research, has been successfully applied to many fields and achieved better results at certain problems than the traditional evolution algorithm [2–4]. As for the function optimization, the cultural algorithm possesses high solution efficiency, but it has such deficiencies as premature convergence, instability, and so on. The chaotic search optimization is characterized with high global search ability, but it is sensitive to the initial values and poor in searching efficiency. Therefore, this study puts forward the chaos cultural algorithm (CCA) by introducing the
Genetic Incompatibility Dampens Hybrid Fertility More Than Hybrid Viability: Yeast as a Case Study
Meibo Xu,Xionglei He
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0018341
Abstract: Genetic incompatibility is believed to be the major cause of postzygotic reproductive isolation. Despite huge efforts seeking for speciation-related incompatibilities in the past several decades, a general understanding of how genetic incompatibility evolves in affecting hybrid fitness is not available, primarily due to the fact that the number of known incompatibilities is small. Instead of further mapping specific incompatible genes, in this paper we aimed to know the overall effects of incompatibility on fertility and viability, the two aspects of fitness, by examining 89 gametes produced by yeast S. cerevisiae - S. paradoxus F1 hybrids. Homozygous F2 hybrids formed by autodiploidization of F1 gametes were subject to tests for growth rate and sporulation efficiency. We observed much stronger defects in sporulation than in clonal growth for every single F2 hybrid strain, indicating that genetic incompatibility affects hybrid fertility more than hybrid viability in yeast. We related this finding in part to the fast-evolving nature of meiosis-related genes, and proposed that the generally low expression levels of these genes might be a cause of the observation.
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