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Search Results: 1 - 10 of 136798 matches for " ZHANG Xu "
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Fecundity and Husband-Wife Age Gap at First Marriage—Cross-Country Analysis  [PDF]
Xu Zhang
Theoretical Economics Letters (TEL) , 2014, DOI: 10.4236/tel.2014.47075

One explanation given for the gender wage gap is the division of labor in the home. On the marriage outset, averagely speaking, husbands who are older invest more human capital in market activities than wives. This paper concentrates on the age gap at first marriage. It hypothesizes that the demand for children is one important reason for the husband-wife age gap. To show this, the paper extends a two-sided matching model of marriage (originally introduced by Eugenio Giolito [1]) based on the biological fact that men have a longer fecundity horizon than women and examines cross-country data from World Marriage Patterns 2000 to show a higher marital age gap the greater the role children play in economic activities, the greater the importance of agriculture in an economy, the greater a country’s rural compared to total population, and the greater the population’s proportion of pro-natal religions.

Lower Approximation Reduction in Ordered Information System with Fuzzy Decision  [PDF]
Xiaoyan Zhang, Weihua Xu
Applied Mathematics (AM) , 2011, DOI: 10.4236/am.2011.27125
Abstract: Attribute reduction is one of the most important problems in rough set theory. This paper introduces the concept of lower approximation reduction in ordered information systems with fuzzy decision. Moreover, the judgment theorem and discernable matrix are obtained, in which case an approach to attribute reduction in ordered information system with fuzzy decision is constructed. As an application of lower approximation reduction, some examples are applied to examine the validity of works obtained in our works..
Rough Computational Approach to UAR based on Dominance Matrix in IOIS  [PDF]
Xiaoyan Zhang, Weihua Xu
Intelligent Information Management (IIM) , 2011, DOI: 10.4236/iim.2011.34016
Abstract: Rough set theory is a new mathematical tool to deal with vagueness and uncertainty. The classical rough set theory based on equivalence relation has made a great progress, while the equivalence relation is too harsh to meet and is extended to dominance relation in real world. It is important to investigate rough computational methods for rough set theory, which is one of the bottleneck problems in the development of rough set theory. In this article, rough computational approach to upper ap-proximation reduction (UAR) is discussed based on dominance matrix in inconsistent ordered information systems (IOIS). The algorithm of upper approximation reduction is obtained, from which we can provide approach to upper approximation reduction operated simply in inconsistent systems based on dominance relations. Finally, an example illustrates the validity of this method, and shows the method is excellent to a complicated information system.
Well-Posedness for Tightly Proper Efficiency in Set-Valued Optimization Problem  [PDF]
Yangdong Xu, Pingping Zhang
Advances in Pure Mathematics (APM) , 2011, DOI: 10.4236/apm.2011.14032
Abstract: In this paper, a characterization of tightly properly efficient solutions of set-valued optimization problem is obtained. The concept of the well-posedness for a special scalar problem is linked with the tightly properly efficient solutions of set-valued optimization problem.
Methods for Lower Approximation Reduction in Inconsistent Decision Table Based on Tolerance Relation  [PDF]
Xiaoyan Zhang, Weihua Xu
Applied Mathematics (AM) , 2013, DOI: 10.4236/am.2013.41024
Abstract: It is well known that most of information systems are based on tolerance relation instead of the classical equivalence relation because of various factors in real-world. To acquire brief decision rules from the information systems, lower approximation reduction is needed. In this paper, the lower approximation reduction is proposed in inconsistent information systems based on tolerance relation. Moreover, the properties are discussed. Furthermore, judgment theorem and discernibility matrix are obtained, from which an approach to lower reductions can be provided in the complicated information systems.

Present Situation of Mobile Medical Applications  [PDF]
Feng Xu, Shiqiang Zhang
Open Journal of Social Sciences (JSS) , 2016, DOI: 10.4236/jss.2016.43012

Mobile medical Application (APP) is not only the product of the information age but a good helper of modern medical. In this paper, the status of mobile medical APP is described in terms of the implementation of mobile medical App, the classification of mobile medical App, mobile medical App quality and content, problems of mobile medical App.

Influence and Application of Cloud Logistics Mode on Express Service  [PDF]
Guangshu Xu, Xuewen Zhang
Open Journal of Applied Sciences (OJAppS) , 2016, DOI: 10.4236/ojapps.2016.68055
Abstract: In this paper, we first introduced the concept of cloud logistics, described the current status of the express delivery and analyzed the impacts of introducing cloud logistics on China’s express delivery industry. Then based on the case of Stars Express, how to introduce the cloud logistics model to the express industry was discussed. Finally, a new model of cloud logistics platform was constructed.
MIC in Circulating Cooling Water System  [PDF]
Ping Xu, Zhaoyi Xu, Jin Wang, Yajun Zhang, Li Zhang
Journal of Water Resource and Protection (JWARP) , 2012, DOI: 10.4236/jwarp.2012.44022
Abstract: MIC is one of the main problems of circulating cooling water system. The direct economic loss by MIC is about 300 to 500 billion dollars. It is good to understand MIC in order to control MIC. Source and species of microorganisms was introduced firstly. There are three kinds of microorganisms in the system, including bacteria, fungi and algae. Species of these microorganisms are shown in the paper. Then, mechanisms of MIC are analysed. Although there is no universal mechanism of MIC, MIC is still mainly an electrochemical corrosion in nature. Meanwhile, the mechanisms on SRB and iron bacteria are introduced in details. At last, several methods of microorganisms control are put forward in the paper.
Autonomic Software Component QoS Matchmaking Algorithm Based on Fidelity Factor in Agent-Based Autonomic Computing System  [PDF]
Kun Zhang, Manwu Xu, Hong Zhang
Journal of Software Engineering and Applications (JSEA) , 2009, DOI: 10.4236/jsea.2009.22015
Abstract: Autonomic software component (ASC) QoS matchmaking problem for autonomic element has been taken as one of the most important issue in field of autonomic computing based on agent. Aimed at overcoming drawbacks such as subjec-tiveness and unfairness, and improving the self-configuration capability for autonomic element, we introduce evalua-tion mechanism of confidence of individual QoS attributes during ASC QoS matchmaking, i.e., fidelity factor for each attribute, and propose an ASC QoS matchmaking algorithm based on fidelity factor. Simulation experiments demon-strate that our proposed algorithm performs best performance in terms of QoS than other existing algorithms, and has better compromise between attribute quality and users’ evaluation when selecting ASC.
Research on the Mode of Efficaciously Solving “Agricultural Super-Docking” Development Difficulties in China  [PDF]
Guangshu Xu, Haifang Zhang, Xuewen Zhang
World Journal of Engineering and Technology (WJET) , 2016, DOI: 10.4236/wjet.2016.43046
Abstract: Constructing circulation mode of high feasibility and good implementation effect is the key method to solve difficulties in the development of “Agricultural Super-Docking” at present in China. There are many problems that exist in the process of the development of “Agricultural Super-Docking” by our analyzing from both the benefit of subjects and the whole supply chain perspectives. A large amount of relevant literature research shows that adopting the “cooperation between the government and the third party logistics enterprises to build distribution center” innovation model can solve these problems. This model can effectively remove obstacles between farmers and supermarkets. It is conducive to the development of small and medium-scale the farmer cooperatives, supermarkets and the third party logistics enterprises that don’t have a strong financial strength and a high degree of brand influence. In addition, it can also produce considerable social benefits. In order to ensure the implementation efficiency of the model to maximize, some management issues in the implementation process about the determination of core subject in supply chain, the method of evaluating the third party logistics enterprises grade, the planning of the number of customers for the distribution center, the mechanism of income distribution among multiple subjects and the implementation of relevant policies after the model into practice should be taken into account.
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