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Live Virtual Machine Migration based on Improved Pre-copy Approach

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Live Virtual Machine Migration based on Improved Pre-copy Ap...

IEEE beijing SECTION(跨国电气电子工程师学会北京分会)

作者： Fei Ma,Feng Liu,Zhen Liu~(*+) * Network Management Research Centre,beijing Jiaotong University + Engineering Research Center of Network Management Technology for High Speed Railway,Ministry of Education beijing 100044,China

Live migration of virtual machine has attracted significant attention in recent *** facilitates system online maintenance,load balancing,fault tolerance and power *** pre-copy approach can balance the downtime and total migration time of contradictions,it will cap the number of copying iterations to the maximum number of iterations since the writable working set is not guaranteed to converge across successive iterations,especially when the VM is executing a largely read-intensive *** this paper,we improve the pre-copy approach on Xen *** add a bitmap page in our improved pre-copy approach,which marks those frequently updated *** the judge in the iteration process, we put those frequently updated pages into the page bitmap,and those pages can only be transmitted in the last round of the iteration *** can ensure that those frequently updated pages are transmitted just once in the iteration process. Experiment demonstrates that compared with pre-copy,our improved pre-copy approach can reduce 3.%of total transferred data and 3.0}5%of total migration time total transferred data on *** importantly,our approach can complete the iteration process no more than 5 times.

关键词： virtual machine live migration improved pre-copy approach

Soil Conservation Assessment in the Upper Yangtze River Basin Based on InVEST Model

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Soil Conservation Assessment in the Upper Yangtze River Basi...

2.11 International Symposium on Water Resource and Environmental Protection(ISWREP 2.11)

作者： REN Jing Key laboratory of Mountain Hazards and Earth Surface Process, CAS, Chengdu, Sichuan 610041, China Institute of Mountain Hazards and Environment, CAS graduate University of CAS, beijing 100049, China.WANG Yukuan, FU Bin, XU Pei Key laboratory of Mountain Hazards and Earth Surface Process, CAS, Chengdu, Sichuan 610041, China Institute of Mountain Hazards and Environment, CAS Chengdu, Sichuan 610041, China

Studying and revealing the spatial distribution of soil loss will play an important role in water and soil conservation planning. In this study, the Geographic Information System （GIS） technology and the Integrated Valuation of Ecosystem Services and Tradeoffs Tool （InVEST） model were applied to estimate the amount of soil loss and assess the soil conservation capacity by the main ecological system in the Upper Yangtze River Basin （UYRB）. The results show: （1） the annual potential soil erosion is 92.92.10 8 t year -1 . The area of average annual soil loss bellow 500 km -2.year -1 occupies 3..08% and above 5000 km -2.year-1 occupies 3..8%. （2.The annual actual soil erosion is 12.3.×10 8 t year -1 . Slight and moderate soil loss is in majority, about 68.15% of the watershed area is found out to be under moderate degree. （3.The annual soil conservation is 80.61×10 8 t year -1 , and the contributing percent of main individual ecosystems was as follows: the forest occupies 46.11%, grassland 2..2.%. Forest ecosystem does best in soil conservation.

关键词： The Upper Yangtze River Basin (UYRB) USLE GIS Soil erosion Soil Conservation

青藏高原晚古生代若干地质问题研究进展与分歧

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大自然探索 1999年第4期18卷 44-50页

作者：朱占祥陈永富任旭东潘云唐滕云四川地矿局区调队四川成都610213 中国科学院研究生院北京100039 西藏地矿局区调队西藏拉萨851400

文中对青藏高原石炭与二叠系界线;冈瓦纳特提斯相地层建阶;冈瓦纳相地层时空分布;冈瓦纳相杂砾岩的成因;冈瓦纳相大陆北界的确定等若干地质问题的研究进展及分歧,加以总结与评述。

关键词：青藏高原晚古生代地质学研究进展地层

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The Study of Thesis Replica Detecte Methods based on Similarity of Text

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The Study of Thesis Replica Detecte Methods based on Similar...

2.10 3.d IEEE International Conference on Computer Science and Information Technology—ICCSIT 2.10

作者： Wenhe Song graduate Department Tianjin Polytechnic University Tianjin China Chunxia Ma Engineering Teach Practice Training Center Tianjin Polytechnic University Tianjin China

To monitor and constraint the plagiarism phenomenon of dissertation,In this paper,we discuss the method of re-investigation method based on similarity of text,and to study dissertation information,the design and realization of chinese text word segmentation and similarity computing with computer system is put forward which make use of TF-IDF method based on VSM combined with the word segmentation *** and experimental results showed that the method is feasible and has good space efficiency.

关键词： Similarity Text Feature Replica Detect VSM

A FAST SPHERE DECODING ALGORITHM FULLY EXPLOITING THE ORTHOGONALITY OF STBC

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A FAST SPHERE DECODING ALGORITHM FULLY EXPLOITING THE ORTHOG...

2.09 IEEE Youth Conference on Information,Computing and Telecommunication(YC-ICT2.09)

作者： WANG Li, JIANG Hua, SHAO Lan, LIN Yicheng, WANG Wenbo Wireless Signal Processing and Network Lab Key Laboratory of Universal Wireless Communication, Ministry of Education beijing University of Posts and Telecommunications, beijing China

In this paper, we propose a fast sphere decoding (SD) algo- rithms for the STBCs whose symbols can be decoupled into several orthogonal groups. The orthogonality of the front levels and the last levels are both utilized, while all the former improved SD algorithms only consider the orthogonality of the last levels. By the proposed algorithm, weights calculation of the front and the last levels are respectively performed independently, thus the computational complexity is significantly reduced. As for the bit error ratio performance, it is not influenced at all. The simulation results show the advantage of our proposed fast SD in complexity economization over a former improved SD algorithm.

关键词： STBC, sphere decoding

PERFORMANCE ANALYSIS FOR CODED COOPERATION PROTOCOL IN FIXED RELAY SYSTEM

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PERFORMANCE ANALYSIS FOR CODED COOPERATION PROTOCOL IN FIXED...

2.09 IEEE Youth Conference on Information,Computing and Telecommunication(YC-ICT2.09)

作者： Chang Li, Student Member, IEEE, Yafeng Wang, Fei Dong, and Dacheng Yang, Member, IEEE Wireless Theories and Technologies Lab (WT&T) beijing University of Posts and Telecommunications beijing, P. R. China

User cooperation enables single antenna terminals to benefit from spatial diversity by partnering with other users to create a virtual transmit antenna array. A promising form of cooperation is called coded cooperation which integrates cooperation with channel coding, showing great performance gains. In this paper, we examine the performance of coded cooperation scheme in fixed relay system, where channel coding is employed between source and relay. Simulation results are presented and show that it is always providing better performance and a higher throughput compared to decode and forward protocol. In addition to the diversity advantage, coded cooperation is based on incremental redundancy and thus receives coding gain.

关键词： Channel coding, signal processing, throughput, cooperative systems, radio communication

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大地电磁测深数据的二维反演

物化探计算技术 1987年第3期 185-194页

作者：刘任严又生王天生马涛陈乐寿王光锷蔡刚潘瑜石油工业部物探局解释中心武汉地院北京研究生部

本文简要地介绍了两种不同的大地电磁测深数据的二维解释方法(从初始模型的确定至偏导数的求取),并编制了反演程序,对固安——霸县大地电磁测深剖面的资料进行了二维反演解释,取得了良好的效果。

关键词：大地电磁测深程序框图大地电磁测探二维反演初始模型

Embrace Lang fang into the economic development of city circle domain

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Embrace Lang fang into the economic development of city circ...

The Sixth Forum of Collaborative Development among Bohai-Rim,Circum-Capital and beijing-Tianjin-Hebei

作者： (Song Chunyun,Lang fang city land and land development construction investment co.,LTD.Zhang Yalan,graduate Student of Hebei University of Technology

As the new theory and model of a modern regional economic development,the domain economy of urban circle is the basis of the industrialization and *** the analysis to the city circle domain economic theory,this article puts forward the concept of city circle economic domain,and further analyzes formation rule of the city circle domain economic and development characteristics.

关键词： circle domain economy Bohai economic circle

培养实用性人才——天津师范大学信息产业学系简介

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图书情报工作 1997年第3期41卷 55-55页

作者：徐久龄天津师范大学信息产业学系

介绍天津师范大学信息产业学系的历史沿革、专业课程设置、远景规划等。

关键词：天津师范大学信息产业学系课程设置

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