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Search Results: 1 - 10 of 132115 matches for " Liu Yu "
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Spatial Accessibility of Road Network in Wuhan Metropolitan Area Based on Spatial Syntax  [PDF]
Chengliang Liu, Ruilin Yu
Journal of Geographic Information System (JGIS) , 2012, DOI: 10.4236/jgis.2012.42017
Abstract: Based on space syntax theory, the spatial accessibility of the road network in Wuhan Metropolitan Area has been quantitatively analyzed by building a series of accessibility variables. Topologic connectivity in the accessible rings appears to be broken; traffic axis network is in spatial structure of hub-and-spoke and fishbone-like. Meanwhile, the differences in classified road network have led to inefficiency of its network servo and its ever-worsening capability to respond to traffic jams. Besides, two band-like integrated cores of which one is east to west along the Yangtze River and the other is north to south along Beijing to Guangzhou Railway, have become the first level traffic axis in the whole network, which is responsible for the connectivity of the entire metropolitan area network. This consequently has strengthened the dominant position of Wuhan which is located on the bands’ crossing. In short, the spatial accessibility of that classified space morphology, the urban system, the transport infrastructure as well as the social and economic development of Wuhan Metropolitan Area are highly interrelated to each other, especially to the high level highway network featured by freeways, the development level of which is well in line with that of road network accessibility.
Analysis on Influencing Elements of Enterprise Logistics Risk Early Warning: Based on Manufacturing Industries in Beijing Area  [PDF]
Yongsheng Liu, Rong Yu
American Journal of Industrial and Business Management (AJIBM) , 2013, DOI: 10.4236/ajibm.2013.34045
Abstract:

Enterprise logistics risk early warning is an essential part of enterprise logistics risk management, which has been increasingly drawing the attentions of both practical and academic world. However, enterprise logistics risk early warning hasn’t been radically put into practice yet. Therefore, the factors hinder the proceeding of enterprise logistics risk early warning become the key to starting the engine of enterprise logistics risk early warning. In this paper, review of researches on enterprise logistics risk early warning is provided, a questionnaire has been designed according to both exterior and internal factors influencing enterprise logistics risk early warning and a survey on manufacturing industries in Beijing area has been carried out, logistics risk early warning status and influencing elements have been analyzed based on previous survey and advices proposed are concluded to provide valuable references.

The Effect of Psychological Capital and Organizational Support on Innovational Behavior and Silence Behavior of Technical Innovation Personnel in Strategic Emerging Industry  [PDF]
Yunchun Yu, Quan Liu
American Journal of Industrial and Business Management (AJIBM) , 2016, DOI: 10.4236/ajibm.2016.66067
Abstract: Chinese strategic emerging industry has been developed rapidly in recent years. As the important guarantee and intellectual support required in the development of this kind industry, enterprise technology innovation talents have become the most significant strength to promote the enterprise technology and industry progress. Therefore, how to guide and motivate their creativity ability at the most extent has come to be a vital scientific question. In order to search for the improvement path to such employees’ innovation ability, the current study mainly investigated the effect of both psychological capital and organizational support on innovation and silence behavior within technical innovation personnel. Through the regression analysis of 350 questionnaires, our results showed that both psychological capital and organizational support had worthy negative effect on their silence behavior and positive effect on their innovation behavior, respectively; meanwhile, psychological capital and organizational support showed interaction effect to both innovation and silence behavior within technical innovation personnel. According to our results, in order to better motivate employees’ innovation ability, corporations should take supportive policies and improve employees’ psychological capital.
On the Solution of the Eigenvalue Complementarity Problem by a Line Search Filter-SQP Algorithm  [PDF]
Qiu Yu, Zhensheng Yu, Yangchen Liu
Journal of Applied Mathematics and Physics (JAMP) , 2017, DOI: 10.4236/jamp.2017.510168
Abstract: In this paper, the Eigenvalue Complementarity Problem (EiCP) with real symmetric matrices is addressed, which appears in the study of contact problem in mechanics. We discuss a quadratic programming formulation to the problem. The resulting problems are nonlinear programs that can be solved by a line search filter-SQP algorithm.
The Influence of Emotion and Gender on Work Efficiency in Hazy Weather  [PDF]
Yaozhong Liu, Min Liu, Kai Yu
Open Journal of Social Sciences (JSS) , 2015, DOI: 10.4236/jss.2015.35009
Abstract: In recent years, the eastern part of China has suffered numerous large-scale continuous fog and haze, which seriously impact people’s production and life. In present research, a combination method of questionnaire and experiment is used to discuss whether the hazy weather could in-fluence the emotion and if there are any impacts on the work efficiency. 2 (gender) × 3 (emotional type: positive, neutral and negative) completely randomized design is used and the reaction time (RT) is analyzed. The results show that 1) hazy weather truly induces the negative emotion, e.g. depression and anxiety; 2) the interaction effect of emotion and gender is significant; the RT of females is significantly longer than males’ in negative emotion condition; for females, RT in negative emotion condition is significantly longer than that in positive and neutral emotion condition, which shows that the hazy weather would lead some inefficiency.
A Method for the Solution of Educational Investment  [PDF]
Jun’e Liu, Le Yu, Xiaolin Liu
Journal of Applied Mathematics and Physics (JAMP) , 2016, DOI: 10.4236/jamp.2016.46118
Abstract: In order to improve the performance of higher education in the United States, the Goodgrant Foundation intends to donate a total of $100,000,000 (US 100 million) to an appropriate group of schools per year, for five years, starting in July 2016. For this, our team puts forward upon an optimal investment strategy, which includes the schools to invest, the investment amount of each school, and the return due to investment, to solve this problem. Our main idea is as follows. First of all, we choose suitable investment school universities in the United States. Secondly, we use Analytic Hierarchy Process to get the rate of return on investment and venture capital. Thirdly, we establish a venture capital return model. Finally, solving the mathematical model ensures the investment amount of each school and the return due to investment. To implement this strategy, first of all, we obtain the candidate school based on students score card. Then, according to the factor analysis, we analyze the factors which mainly affect the choice of school. Secondly, we employ Analytic Hierarchy Process to get the rate of return on investment and capital risk. In the end, we establish a risk return model to get investment amount for each school, amount of risk and return. In order to ensure the minimum risk and the maximum return, we set up a multi objective programming model and solve it by using the constraint method. We get the result that includes the maximum net profit of the investment and risk loss rate. According to statistical analysis, we can get the overall return of net income within five years. Finally, we choose 320 candidate schools and get the investment amount of each school according to the principle of as many schools as possible. We have proved that the foundation will receive a return of more than 295.363 million in the next 5 years. After-verification, our strategy can be directly applied to the investment field and get good results.
Teaching Multiliteracies in Scientific Discourse: Implications from Symbolic Construction of Chemistry*
Yu Liu
K@ta : a Biannual Publication on the Study of Language and Literature , 2009,
Abstract: Recent research on science education has increasingly focused on the literacy challenges posed by multimodality. While students are required by government mandated syllabi to make a successful translation between different semiotic resources, there still remains a lack of research on the grammars and functionality of the specialized modalities to develop explicit instructions to improve literacy practices. This paper analyses the semiotic resource of chemical symbolism in secondary school chemistry textbooks with a Systemic Functional Multimodal Discourse Analysis approach (SF-MDA). It is argued that chemical symbolism is far from a jargon or mere shorthand for language. Instead, it develops unique grammatical devices to realize sub-microscopic meaning and topological meaning, which outstrips the meaning potential of language. The current study also discusses how the SF-MDA approach could develop a visible pedagogy and improve chemistry education.
Hearts of twin cotorsion pairs on exact categories
Yu Liu
Mathematics , 2013,
Abstract: In the papers of Nakaoka, he introduced the notion of hearts of (twin) cotorsion pairs on triangulated categories and showed that they have structures of (semi-) abelian categories. We study in this article a twin cotorsion pair (S,T),(U,V) on an exact category B with enough projectives and injectives and introduce a notion of the heart. First we show that its heart is preabelian. Moreover we show the heart of a single cotorsion pair is abelian. These results are analog of Nakaoka's results in triangulated categories. We also consider special cases where the heart has nicer structure. By our results, the heart of a special twin cotorsion pair (S,T),(T,V), is integral and almost abelian. Finally we show that the Gabriel-Zisman localisation of the heart at the class of regular morphisms is abelian, and moreover it is equivalent to the category of finitely presented modules over a stable subcategory of B.
Half exact functors associated with cotorsion pairs on exact categories
Yu Liu
Mathematics , 2013,
Abstract: In the previous article "Hearts of twin cotorsion pairs on exact categories", we introduced the notion of the heart for any cotorsion pair on an exact category with enough projectives and injectives, and showed that it is an abelian category. In this paper, we construct a half exact functor from the exact category to the heart. This is analog of the construction of Abe and Nakaoka for triangulated categories. We will also use this half exact functor to find out a sufficient condition when two different hearts are equivalent.
Hearts of cotorsion pairs are functor categories over cohearts
Yu Liu
Mathematics , 2015,
Abstract: We study hearts of cotorsion pairs in triangulated and exact categories. We show that they are equivalent to functor categories over cohearts of the cotorsion pairs.
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