检索结果-南通市图书馆

The evolution of cooperation in asymmetric systems

在线全文

学校读者我要写书评

暂无评论

Science china(Life Sciences) 2010年第1期53卷 139-149页

作者： WANG RuiWu1 & SHI Lei2 1 State Key Laboratory of Genetic Resources and Evolution,kunming Institute of Zoology,Chinese Academy of Science,kunming 650223,china 2 Statistics and Mathematics College,yunnan university of Finance and Economics,kunming 650221,china 1. State Key Laboratory of Genetic Resources and Evolution Kunming Institute of Zoology Chinese Academy of Science Kunming 650223 China2. Statistics and Mathematics College Yunnan University of Finance and Economics Kunming 650221 China

Explaining the "Tragedy of the Commons" of the evolution of cooperation remains one of the greatest problems for both biology and social *** interaction,which is one of the most important characteristics of cooperative systems,has not been sufficiently considered in the existing models of the evolution of *** the inequality in the number and payoff between the cooperative actors and recipients in cooperation systems,discriminative density-dependent interference competition will occur in limited dispersal *** model and simulation show that the local but not the global stability of a cooperative interaction can be maintained if the utilization of common resource remains unsaturated,which can be achieved by density-dependent restraint or competition among the cooperative *** intense density dependent interference competition among the cooperative actors and the ready availability of the common resource,with a higher intrinsic contribution ratio of a cooperative actor to the recipient,will increase the probability of *** cooperation between the recipient and the cooperative actors can be transformed into conflict and,it oscillates chaotically with variations of the affecting factors under different environmental or ecological *** higher initial relatedness(*** to kin or reciprocity relatedness),which is equivalent to intrinsic contribution ratio of a cooperative actor to the recipient,can be selected for by penalizing less cooperative or cheating actors but rewarding cooperative individuals in asymmetric *** initial relatedness is a pivot but not the aim of evolution of *** explains well the direct conflict observed in almost all cooperative systems.

关键词： cooperation altruism density dependent tragedy of the commons oscillation chaos asymmetric interaction interference competition

An Inquiry into Cultivation of New-generation Farmers

在线全文

学校读者我要写书评

暂无评论

Asian agricultural Research 2012年第1期4卷 40-44页

作者： KONG Dong-qing, LIU Fu-jun yunnan agricultural university, kunming 650201, china

This article expounds the necessity of the transformation from traditional farmers to modern new farmers: the building of new socialist countryside needs modern new farmers; the coordination of urban-rural integration development needs the transformation from traditional farmers to modern new farmers; the development of modern agriculture needs the transformation from traditional farmers to modern new farmers. Then it analyses the characteristics and role of new-generation farmers, and presents the way to accelerate cultivation of new-generation farmers: make sound laws and regulations, to lay solid foundation for cultivation of new-generation farmers; create conditions, to provide funds guarantee for cultivation of new-generation farmers; make scientific planning, to promote regular, systematized and standardized training work for new-generation farmers; focus on education, to promote the overall quality of new-generation farmers; innovate upon content, to meet the needs of development of new-generation farmers; highlight focus, to intensify competitiveness training for returning-home migrant workers.

关键词： "New generation" New famers Cultivation

Response to“Discussion on the systematic position of the Early Cambrian priapulomorph worms”

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science Bulletin 2006年第2期51卷 250-256页

作者： HAN Jian1 & HU Shixue2 1. Department of Geology and Key Laboratory for Continental Dynam- ics of the Education Ministry, Northwest university, Xi’an 710069, china 2. yunnan Geological Institute, kunming 650011, china Department of Geology and Key Laboratory for Continental Dynamics of the Education Ministry Northwest University Xi’an China yunnan Geological Institute Kunming China

Due to the combination of complex states of preservation and taphonomies inChengjiang fossils, Huang et al.) expressed different opinions to those of Han et al.) on themorphology and systematic position of the fossil priapulomorph worms (Priapulomorpha) based on theiradditional materials. These diverse opinions are critical in any investigation of the diversity ofthe Introverta in the Cambrian explosion. However, some of their ideas need to be discussed infurther detail.

关键词： Response to Discussion on the systematic position of the Early Cambrian priapulomorph worms

Abundant Semigroups with a Multiplicative Adequate Transversal

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2002年第2期18卷 229-244页

作者： GUO Xiao Jiang Department of Mathematics.yunnan university.kunming 650091,P.R.china Department of Mathematics Yunnan University Kunming P. R. China

The aim of this paper is to investigate abundant semigroups with a multiplicative adequate *** properties and characterizations for such semigroups are *** particular. we establish the structure of this class of abundant semigroups in terms of left normal bands,right normal braids and adequate semigroups with some simple Compatibility *** apply this structure to some special cases.

关键词： Abundant semigroup Adequate semigroup Left(Right)normal band

The topological configuration and conformational analysis of mRNA in translation

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2002年第5期47卷 384-389页

作者： LIU Shuqun & LIU Ciquankunming Institute of Zoology, Chinese Academy of Sciences, kunming 650223, china Modern Biological Center, yunnan university, kunming 650091, china kunming Institute of Zoology Chinese Academy of Sciences Kunming China Modern Biological Center Yunnan University Kunming China

The theoretical model construction of mRNA hairpin structure and single-stranded structure as well as the simulation studies on RNA structure determined by the X-ray crystal diffraction and nuclear magnetic resonance revealed that in translation, after mRNA being unfolded into single-stranded structure, its topological configuration was closely correlative with the original hairpin structure. The conformational features of single-stranded mRNA appeared as helical regions alternating with curly regions to different extents, which might exert the influence on the folding of nascent polypeptide by various regulating effects including different translational rates.

关键词： hairpin structure of mRNA topological configuration of single-stranded mRNA.

A possible mode of the specific recognition of nucleic acids by proteins

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2001年第11期46卷 930-934页

作者： LI Xuqing & LIU CiquanDepartment of Computer Science, kunming university of Science and Technology, kunming 650041, china Laboratory of Cellular and Molecular Evolution, kunming Institute of Zoology, Chinese Academy of Sciences, kunming 650223, china yunnan Observatory, Chinese Academy of Sciences, kunming 650011, china 4. Modern Biological Center, yunnan university, kunming 650091, china Department of Computer Science Kunming University of Science and Technology Kunming China yunnan Observatory Chinese Academy of Sciences Kunming China Laboratory of Cellular and Molecular Evolution Kunming Institute of Zoology Chinese Academy of Sciences Kunming China Modern Biological Center Yunnan University Kunming China

Seven sets of protein target sites, which occur in several gene promoters, have been analyzed. The results suggest that there is a possible mode of specific recognition of double-helical nucleic acids by proteins. This recognition mode is related to a special topological property of double-helical DNA, which is termed base spatial pattern (BSP) of DNA segment. BSP is the spatial topological property determined only by the spatial arrangement of the bases on double-helical DNA segment.

关键词： protein nucleic acids recognition base spatial pattern (BSP) target sites.

Sequence-based localization algorithm with improved correlation metric and dynamic centroid

在线全文

学校读者我要写书评

暂无评论

Science china(Information Sciences) 2011年第11期54卷 2349-2358页

作者： YU Ying 1,JIANG ChunXiao 2,ZHAO XiaoJie 2,YUN LiJun 1,LI ZhiHua 2 & REN Yong 21 College of Information,yunnan Normal university,kunming 650500,china 2 Department of Electronic Engineering,Tsinghua university,Beijing 100084,china 1. College of Information Yunnan Normal University Kunming 650500 China2. Department of Electronic Engineering Tsinghua University Beijing 100084 China

Ecolocation (error controlling localization technique) is a novel sequence-based RF localization algorithm.A key feature of the Ecolocation algorithm is that it constructs a constraint table based on RSSI values and compares data between two ***,the definitions of the constraint and the centroid in the Ecolocation algorithm are imperfect,and result in poor localization *** improve the localization accuracy,a new algorithm based on weighted rank order correlation coefficient and dynamic centroid method is *** results indicate that compared with the Ecolocation,the localization accuracy and robustness of the new algorithm are distinctly raised.

关键词： WSNs (wireless sensor networks) localization sequences constraint table rank order correlation coefficient

Manifold contraction for semi-supervised classification

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science china(Information Sciences) 2010年第6期53卷 1170-1187页

作者： HU EnLiang 1,2 , CHEN SongCan 1 & YIN XueSong 1 1 School of Computer Science & Engineering, Nanjing university of Aeronautics & Astronautics, Nanjing 210016, china 2 School of Mathematics, yunnan Normal university, kunming 650092, china 1. School of Computer Science & Engineering Nanjing University of Aeronautics & Astronautics Nanjing 210016 China2. School of Mathematics Yunnan Normal University Kunming 650092 China

The generalization ability of classification is often closely related to both the intra-class compactness and the inter-class *** to the fact that many current dimensionality reduction methods, regarded as a pre-processor, often lead to the poor classification performance on real-life data, in this paper, a new data preprocessing technique called manifold contraction(MC) is proposed for the classification-oriented learning *** main motivation behind MC lies in seeking a proper mapping of contracting the given multiple-manifold data such that the ratio of the intra-class to the inter-class scatters is ***, in order to properly control the contraction level in MC, an adaptive MC(AMC) criterion is developed in the semi-supervised *** to its generality, MC can be not only applied in original space and reproducing kernel Hilbert space(RKHS), but also easily incorporated with dimensionality reduction method for further improvement of classification *** final experimental results show that MC, as a data preprocessor, is effective and promising in the subsequent classification learning, especially in small-size labeled sample case.

关键词： manifold learning dimensionality reduction lower-dimensional embedding semi-supervised learning classification manifold contraction adaptive manifold contraction

Cultural Relevance for Rural Community Development in china: A Case Study in Bai, Jingpo and Huyaodai Communities of yunnan Province

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Population,Resources and Environment 2007年第2期5卷 78-83页

作者： Cai Kui1, Du Juan2, Dai Cong3, Hu Huabin4 1. Center for Rural Development Studies, yunnan university, kunming yunnan 650091, china 2. Institute of Ethnology, yunnan Academy of Social Science, kunming yunnan 650034, china 3. Institute of Economics, yunnan Academy of Social Science, kunming yunnan 650034, china 4. Xishuangbanna Tropical Botany Garden, Chinese Academy of Sciences, kunming Yunan 650223, china Center for Rural Development Studies Yunnan University Kunming Yunnan 650091 China Institute of Ethnology Yunnan Academy of Social Science Kunming Yunnan 650034 China Institute of Economics Yunnan Academy of Social Science Kunming Yunnan 650034 China Xishuangbanna Tropical Botany Garden Chinese Academy of Sciences Kunming Yunnan 650223 China

A three-year study over the Bai, Jingpo and Huayaodai communities in yunnan Province reveals that the community development is significantly influenced in various ways by such cultural factors as the concepts of development; concepts and traditions of inter-community relationships, consumption, mar- riage and gender; patterns of decision-making and production, resource and income allocation; as well as the role of information dissemination systems, religion and ritual. Based on the analysis over the interactive relevance between each factor and community development, some strategies and methods for dealing with such a cultural relevance in development projects are recommended.

关键词： ethnic minority cultural relevance community development