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7th Pacific Rim International Conference on Advanced Materials and Processing

作者： Meng, Jian Zhang, Jinghuai Zhang, Deping Tian, Zheng Sun, Wei Lu, Huayi Tang, Dingxiang Chinese Acad Sci Changchun Inst Appl Chem State Key Lab Rare Earth Resource Utilizat Changchun 130022 Peoples R China Harbin Engn Univ Key Lab Superlight Mat & Surface Harbin 150001 Peoples R China

ISBN: (纸本)0878492550

Several Mg-4Al-4La/Ce alloys were developed and their microstructure and mechanical properties were evaluated. The phase compositions of Mg-4Al-4La alloy consist of alpha-Mg and Al11La3 phases. While two binary Al-RE phases, Al11RE3 and Al2RE (RE=Ce/La), are formed in Mg-4Al-4Ce/La alloy, and Al11Ce3 and Al2Ce are formed in Mg-4Al-4Ce alloy. The optimal tensile properties are obtained in Mg-4Al-4Ce/La alloy, in which the UTS, YS and delta are 250, 149.2 MPa and 12.24% at room temperature, and 157.8, 116 MPa and 27% at 150 degrees C, and 99.1, 118.2 MPa and 23.2% at 250 degrees C, respectively. The mechanics properties of Mg-4Al-4Ce/La alloy are nearly same with commercial AE44. The compression creep is lower than that AJ62 alloy.

关键词： Mg-Al-RE alloy Heat-resistance Mg alloy Creep-resistance Mg alloy La/Ce mischmetal

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Analysis of overlay topology of peer-to-peer applications

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Journal of china Universities of Posts and Telecommunications 2010年第SUPPL. 2期17卷 60-66页

作者： Yu, Ke Cao, Yang Huang, Xiao-Hong Wu, Xiao-Fei School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing 100876 China School of Computer Science and Technology Beijing University of Posts and Telecommunications Beijing 100876 China

With the ever growing usage of peer-to-peer (P2P) technology, more and more P2P applications emerge on Internet. Based on purely distributed architecture of basic P2P, many new architecture and strategies are developed to improve quality of experience (QoE) of P2P applications. Peer to server and peer (P2SP) architecture is used by Thunder, while UUSee combines content delivery network (CDN) and P2P architecture. Understanding the characteristics of different P2P architectures is important for service provisioning and network optimization. In this paper, based on a large sample of flow data collected from operational network, we study overlay topology properties of different P2P applications from complex network perspective, including BT, Thunder, and UUSee. The overlay topology is modeled as a weighted directed graph, and degree distribution, reachability and PageRank distribution are analyzed. Analysis results show different characteristics of P2P applications, which indicate different quality of experience. © 2010 The Journal of china Universities of Posts and Telecommunications.

关键词： Quality of service

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Virtual EP: a simulator of multi-agents-based virtual plant growth in response to environmental heterogeneity

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JOURNAL OF SIMULATION 2010年第3期4卷 181-195页

作者： Qu, H. Zhu, Q. Fu, H. Lu, Z. Chongqing Univ Chongqing 400044 Peoples R China Iowa State Univ Ames IA USA Chongqing Agr Sci Inst Chongqing Peoples R China

This paper presents VirtualEP, a novel simulator for eggplant growth, integrating Agent-Based Modelling technology and existing knowledge of plant physiology. VirtualEP simulates the growth and development of eggplant as an evolution of a dynamic branching network whose nodes are represented by Autonomous Virtual Organs (AVOs). The AVO possesses inbuilt data structure, states and functional rules so that it can autonomously perform physiological procedures (eg photosynthesis, nutrient uptake, storage, mobilization and respiration, etc) to respond to environmental heterogeneity. A discrete implementation of pressure-flow paradigm is incorporated to simulate carbon, water and nitrogen transport and allocation among AVOs. Simulation results demonstrate that VirtualEP can effectively deal with global nutrients allocation, growth in response to variation of air temperature, solar radiation as well as water and nitrogen stress. Moreover, VirtualEP can also provide vivid 3D visualization of these features.

关键词： virtual plants agent-based modelling matter transport simulation eggplant

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A layered Virtual Organization architecture for grid

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JOURNAL OF SUPERCOMPUTING 2010年第3期51卷 333-351页

作者： Zou, Yongqiang Zha, Li Wang, Xiaoning Zhou, Haojie Li, Peixu Chinese Acad Sci Inst Comp Technol Beijing 100190 Peoples R China

Virtual Organizations (VOs) are dynamic collections of individuals, institutions, and resources. VOs are widely accepted in grid and other distributed computing environments. Previous VO research produces several separate tools to provide part of the functionality including user registration, user mapping, authentication, authorization, and VO management. However, none of the work covers all the functionality or focuses on non-functional properties. This paper formally defines virtual organization in terms of three functional requirements and four non-functional properties. The functional requirements are user management, resource management, and VO management. The non-functional properties are decentralization, flexibility, simplicity, and efficiency. The problem is formulated as designing a VO architecture to satisfy the functional requirements and achieve the non-functional properties at the same time. This paper presents a layered architecture with GNode abstraction to construct Agora, an implementation of VOs. In Agora architecture, all the entities including users, resources, and agoras are abstracted as GNodes. A naming layer is constructed to manage these GNodes. At the top, there is a logic layer implementing all Agora functionality based on GNode and managing the physical layer resources. The Agora architecture has been implemented in the Vega Grid Operating System. Agora is deployed in the china National Grid and other grid platforms with more than 27 sites and 19 applications. The evaluations through real applications, high performance computing VO scenarios, and micro benchmarks show that the Agora architecture provides complete VO functionality, while achieving decentralization, flexibility, simplicity, and efficiency.

关键词： Grid Virtual Organization VO Access control Agora RController GNode

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A modern service-oriented extensible security authentication model based on company

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Journal of china Universities of Posts and Telecommunications 2010年第SUPPL. 1期17卷 107-111页

作者： Yang, Jun Wang, Dong-Yu Yu, Xiao-Mei Song, Jun-De School of Computer Science and Technology Beijing University of Posts and Telecommunications Beijing 100876 China Department of Electronic Engineering North China University of Technology Beijing 100041 China

This paper proposes a modern service-oriented extensible authentication model base on company (EAMBCom), after researching some security authentication models commonly used in distributed environment. The advantages and disadvantages of strictly hierarchical authentication model (SHAM), and multiple-certificate-authority (multi-CA) model are analyzed. The EAMACom model can regard "company" as logical authentication unit, which can be extended easily and owns the ability of reducing burden of root certificate authority (RootCA). In addition, the EAMACom model can simplify the certification process on the premise of authentication security, so it actually can be used in modern service-oriented distributed file system for security. © 2010 The Journal of china Universities of Posts and Telecommunications.

关键词： Authentication

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A Weighted Voting-Based Associative Classification Algorithm

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COMPUTER JOURNAL 2010年第6期53卷 786-801页

作者： Zhu, Xiaoyan Song, Qinbao Jia, Zihan Xi An Jiao Tong Univ Dept Comp Sci & Technol Xian 710049 Peoples R China

A new associative classification algorithm based on weighted voting (ACWV) is presented. ACWV takes advantage of two methods: the optimal rule method preferring high-quality rules and the voting method considering the majority of the rules. Moreover, the method takes into account both the length and convictions of rules to calculate their weights. First, ACWV builds a class-count FP-tree (called CCFP-tree) from the given historical data. After that, the weighted voting result for a new instance can be obtained from the CCFP-tree directly without storing, retrieving and sorting rules explicitly. The label of the class with maximal sum of weighted votes is then that of the new instance. Results of the experiments with 36 data sets selected from the UCI machine learning repository show that the proposed method has its advantages in comparison with previous methods in terms of classification accuracy.

关键词： classification association rule associative classification weighted voting

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A GENERALIZED NEURAL NETWORK FOR SIMULTANEOUS RETRIEVAL OF ATMOSPHERIC PROFILES AND SURFACE TEMPERATURE FROM HYPERSPECTRAL THERMAL INFRARED DATA 30

A GENERALIZED NEURAL NETWORK FOR SIMULTANEOUS RETRIEVAL OF A...

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30th IEEE International Geoscience and Remote Sensing Symposium (IGARSS) on Remote Sensing - Global Vision for Local Action

作者： Wang, Ning Tang, Bo-Hui Li, Chuanrong Li, Zhao-Liang Chinese Acad Sci Inst Geog Sci & Nat Resources Res State Key Lab Resources & Environm Informat Syst Beijing 100101 Peoples R China Univ Chinese Acad Sci Beijing Peoples R China Chinese Acad Sci Acad Opto Electron Beijing 100080 Peoples R China CNRS UDS LSIIT Illkirch Graffenstaden BP10413 France

ISBN: (纸本)9781424495665

This paper makes an attempt to establish a generalized neural network for simultaneously retrieving atmospheric profiles and surface temperature from hyperspectral thermal infrared data. To generate the simulated data covering the whole actual situations, the distributions of surface material, temperature and atmospheric profiles are elaborated carefully. The simulated at-sensor radiances are divided into two sub-ranges, one in atmospheric window and another in water absorption band. The simulated data are transformed in the eigen-domain in both sub-ranges and used as the network inputs. The atmospheric profiles, surface temperature and emissivity are used as the outputs after the eigen-domain transformation. The validation of the trained network indicates that a RMSE of surface temperature around 1.6K, a RMSE of temperature profiles around 2K in troposphere and a RMSE of total water content around 0.3g/cm(2) can be obtained. The results from the net can be used as initial guess of the physical retrieval model.

关键词： Hyperspectral thermal infrared data atmospheric profile land surface temperature neural network retrieval

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Antimicrobial peptaibols induce defense responses and systemic resistance in tobacco against tobacco mosaic virus

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FEMS MICROBIOLOGY LETTERS 2010年第2期313卷 120-126页

作者： Luo, Yan Zhang, Dan-Dan Dong, Xiao-Wei Zhao, Pei-Bao Chen, Lei-Lei Song, Xiao-Yan Wang, Xing-Jun Chen, Xiu-Lan Shi, Mei Zhang, Yu-Zhong Shandong Univ State Key Lab Microbial Technol Marine Biotechnol Res Ctr Jinan 250100 Peoples R China Shandong Tobacco Ind Corp Ctr Technol Jinan Peoples R China Liaocheng Univ Dept Plant Protect Liaocheng Peoples R China Shandong Acad Agr Sci High Tech Res Ctr Jinan Peoples R China

Trichoderma spp. are well-known biocontrol agents because of their antimicrobial activity against bacterial and fungal phytopathogens. However, the biochemical mechanism of their antiviral activity remains largely unknown. In this study, we found that Trichokonins, antimicrobial peptaibols isolated from Trichoderma pseudokoningii SMF2, could induce defense responses and systemic resistance in tobacco (Nicotiana tabacum var. Samsun NN) against tobacco mosaic virus (TMV) infection. Local Trichokonin (100 nM) treatment led to 54% lesion inhibition, 57% reduction in average lesion diameter and 30% reduction in average lesion area in systemic tissue of tobacco compared with control, indicating that Trichokonins induced resistance in tobacco against TMV infection. Trichokonin treatment increased the production of reactive oxygen species and phenolic compounds in tobacco. Additionally, application of Trichokonins significantly increased activities of pathogenesis-related enzymes PAL and POD, and upregulated the expression of several plant defense genes. These results suggested that multiple defense pathways in tobacco were involved in Trichokonin-mediated TMV resistance. We report on the antivirus mechanism of peptaibols, which sheds light on the potential of peptaibols in plant viral disease control.

关键词： Trichoderma pseudokoningii SMF2 peptaibols Trichokonins TMV resistance

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Tree Cover Based Geographic Routing with Guaranteed Delivery

Tree Cover Based Geographic Routing with Guaranteed Delivery

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2010 IEEE International Conference on Communications

作者： Tang, Mingdong Chen, Hongyang Zhang, Guoqing Yang, Jing Hunan Univ Sci & Technol Lab Knowledge Proc & Networked Manufacture Xiangtan Peoples R China Chinese Acad Sci Inst Comp Technol Beijing Peoples R China Univ Tokyo Inst Ind Sci Tokyo Japan

ISBN: (纸本)9781424464043

For wireless ad hoc or sensor networks, non-flooding, guaranteed delivery routing protocols are preferred because of limited energy. In this paper we introduce TCGR, a tree cover based geographic routing protocol for wireless networks. We assign to each node a set of short labels such that nodes are embedded in a metric space induced by one or multiple trees. Based on the embedding, we use only greedy routing to deliver packets, i.e., packets are always forwarded to the neighbor closest to the destination. Unlike many previous geographic routing protocols, we guarantee a full success ratio in finding a route to the destination, if such a route exists in the network. Moreover, each node only needs to maintain a small amount of information, which is almost surely bounded by O(log(2)n) bits, and the label size and packet header size are also bounded by O(log(2)n) bits. Simulations show TCGR can achieve remarkable performance in both path stretch and node load.

关键词： Routing protocols

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Bioinformatics study indicates possible microRNA-regulated pathways in the differentiation of breast cancer

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Chinese Science Bulletin 2010年第10期55卷 927-936页

作者： PEI YunFei WANG ZhiMin FEI Fei SHAO ZhiMing HUANG Wei ZHANG XueGong MOE Key Laboratory of Bioinformatics and Bioinformatics Division TNLIST/Department of Automation Tsinghua University Beijing 100084 China Chinese National Human Genome Center at Shanghai Shanghai 201203 China Breast Cancer Institute Cancer Hospital Department of Oncology Shanghai Medical College Institutes of Biomedical Sciences Fudan University Shanghai 200032 China Department of Breast Surgery Cancer Hospital/Cancer Institute Breast Cancer Institute Fudan University Shanghai 200032 China

microRNAs (miRNAs) have been reported to be associated with the pathogenesis and progression of breast ***,little is known about the pathways through which miRNAs regulate these processes,e.g.,the interaction between miRNAs and their target genes with regard to different pathological status of breast cancer,such as histological *** study investigated the possible roles of miRNAs in the differentiation of histological grades of breast cancer with a computational *** on a microarray dataset,15 candidate miRNAs were identified,whose predicted target genes are enriched as differentially expressed between grade I and grade III breast *** them,9 key miRNAs focalize their target genes on 6 central signaling *** SMAD7 protein,the main inhibitory protein in the TGF-β pathway,is predicted as a target of several miRNAs and is also regulated by several other pathways that are possibly targeted by *** was hypothesized that miRNAs participate in the differentiation of breast cancer and the TGF-β pathway acts as a major implementary pathway on which several miRNAs take effect through multiple *** prediction power of the predicted miRNA target genes was validated on three independent *** differential expression of three miRNAs was validated by real-time PCR on breast carcinoma samples of 10 patients.

关键词：信号通路乳腺癌小分子RNA 生物信息学分化 miRNAs 转化生长因子-β 病理状态

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