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A Minimum-energy Path-preserving Topology Control Algorithm for Wireless Sensor Networks

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International Journal of Automation and computing 2009年第3期6卷 295-300页

作者： jin-Zhao Lin xian Zhou Yun Li Research Center for Wireless Sensor Networks Chongqing University of Posts and Telecommunications Chongqing 400065 PRC Institute of Communication and TT ＆ C Chongqing University Chongqing 400044 PRC Key Laboratory of Optical Communication and Lightwave Technologies Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 PRC

The topology control strategies of wireless sensor networks are very important for reducing the energy consumption of sensor nodes and prolonging the life-span of networks. In this paper, we put forward a minimum-energy path-preserving topology control （MPTC） algorithm based on a concept of none k-redundant edges. MPTC not only resolves the problem of excessive energy consumption because of the unclosed region in small minimum-energy communication network （SMECN）, but also preserves at least one minimum-energy path between every pair of nodes in a wireless sensor network. We also propose an energy-efficient reconfiguration protocol that maintains the minimum-energy path property in the case where the network topology changes dynamically. Finally, we demonstrate the performance improvements of our algorithm through simulation.

关键词： Wireless sensor networks topology control power-efficient minimum energy property k-redundant edges.

Cobalt(I) Catalyzed Reaction of Benzaldehydes with Functionalized Benzylic Zinc Halides

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Chinese Chemical Letters 2002年第5期13卷 405-406页

作者： jin xian WANG Ying FU Yu Lai HU College of Chemistry&Chemical Engineering Northwest Normal UniversityLanzhou 730070

Functionalized benzylic zinc halides reacted with benzaldehydes in the presence of Lewis acid Me3SiCl giving high yields of trans-stilbenes under the catalysis of Co(PPh3)3Cl.

关键词： Co(I) catalysis functionalized benzylic zinc halides benzaldehydes stilbenes.

Control of Halo-Chaos in Beam Transport Network via Neural Network Adaptation with Time-Delayed Feedback

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Communications in Theoretical Physics 2006年第1期45卷 117-120页

作者： FANG jin-Qing LUO Xiao-Shu Guo-xian China institute of Atomic Energy P.O. Box 275-27 Beijing 102413 China Department of Physics and Electronic Science Guangxi Normal University Guilin 541004 China

Subject of the halo-chaos control in beam transport networks （channels） has become a key concerned issue for many important applications of high-current proton beam since 1990＇. In this paper, the magnetic field adaptive control based on the neural network with time-delayed feedback is proposed for suppressing beam halo-chaos in the beam transport network with periodic focusing channels. The envelope radius of high-current proton beam is controlled to reach the matched beam radius by suitably selecting the control structure and parameter of the neural network, adjusting the delayed-time and control coefficient of the neural network.

关键词： beam transport network periodic focusing channels high-current proton beam halo-chaos neural network adaptation control time-delayed feedback

On the Category of Koszul Modules of Complexity One of an Exterior Algebra

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Acta Mathematica Sinica,English Series 2006年第3期22卷 849-854页

作者： jin Yun GUO Bing Jun LI Qiu xian WU Department of Mathematics Hunan Normal University

In this paper, we prove that there is a natural equivalence between the category F1（x） of Koszul modules of complexity 1 with filtration of given cyclic modules as the factor modules of an exterior algebra A = ∧V of an m-dimensional vector space, and the category of the finite-dimensional locally nilpotent modules of the polynomial algebra of m - 1 variables.

关键词： exterior algebra Koszul module complexity

On the Koszul Modules of Exterior Algebras

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Acta Mathematica Sinica,English Series 2007年第11期23卷 1967-1984页

作者： jin Yun GUO Quan Hong WAN Qiu xian WU Department of Mathematics Xiangtan University Xiangtan 411105 P. R. China Department of Mathematics Hu'nan Normal University Changsha 410081 P. R. China

We prove that the Koszul modules over an exterior algebra can be filtered by the cyclic Koszul modules. We also introduce the cyclic dimension vector as invariants for studying the Koszul modules over an exterior alge... 详细信息

关键词： exterior algebra Koszul module cyclic dimension vector

Selfinjective Koszul Algebras of Finite Complexity

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Acta Mathematica Sinica,English Series 2009年第12期25卷 2179-2198页

作者： jin Yun GUO Ai Hua LI Qiu xian WU Department of Mathematics Xiangtan University Xiangtan 411105 P. R. China Department of Mathematics Hu'nan Normal University Changsha 410081 P. R. China

In this paper, we study selfinjective Koszul algebras of finite complexity. We prove that the complexity is a nonnegative integer when it is finite; and that the category Yt of modules with complexity less or equal to t, is resolving and coresolving. We show that for each 0 ≤ 1 ≤ m there exist a family of modules of complexity 1 parameterized by G（l, m）, the Grassmannian of l-dimensional subspaces of an m-dimensional vector space V, for the exterior algebra of V. Using complexity, we also give a new approach to the representation theory of a tame symmetric algebra with vanishing radical cube over an algebraically closed field of characteristic 0, via skew group algebra of a finite subgroup of SL（2, C） over the exterior algebra of a 2-dimensional vector space.

关键词： selfinjective Koszul algebra complexity skew group algebra tame symmetric algebra

Using Genome-Referenced Expressed Sequence Tag Assembly to Analyze the Origin and Expression Patterns of Gossypium hirsutum Transcripts

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Journal of Integrative Plant Biology 2013年第7期55卷 576-585页

作者： xiang jin Qin Li Guanghui Xiao Yu-xian Zhu State Key Laboratory of Protein and Plant Gene Research College of Life SciencesPeking University National Center for Plant Gene Research(Beijing)

We assembled a total of 297,239 Gossypium hirsutum （Gh, a tetraploid cotton, AADD） expressed sequence tag （EST） sequences that were available in the National Center for Biotechnology Information database, with reference to the recently published G. raimondii （Gr, a diploid cotton, DD） genome, and obtained 49,125 UniGenes. The average lengths of the U niGenes were increased from 804 and 791 bp in two previous EST assemblies to 1,019 bp in the current analysis. The number of putative cotton UniGenes with lengths of 3 kb or more increased from 25 or 34 to 1,223. As a result, thousands of originally independent G. hirsutum ESTs were aligned to produce large contigs encoding transcripts with very long open reading frames, indicating that the G. raimondii genome sequence provided remarkable advantages to assemble the tetraploid cotton transcriptome. Significant different distribution patterns within several GO terms, including transcription factor activity, were observed between D- and A-derived assemblies. Tran- scriptome analysis showed that, in a tetraploid cotton cell, 29,547 UniGenes were possibly derived from the D subgenome while another 19,578 may come from the A subgenome. Finally, some of the in silico data were confirmed by reverse transcription polymerase chain reaction experiments to show the changes in transcript levels for several gene families known to play key role in cotton fiber development. We believe that our work provides a useful platform for functional and evolutionary genomic studies in cotton.

关键词： Cotton fiber deep sequencing expressed sequence tag assembly functional genomics Gossypium.

Progressive Furniture Model Decimation with Texture Preservation

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Journal of Computer Science & Technology 2019年第6期34卷 1258-1268页

作者： Zhi-Guang Pan Chu-Hua xian Shuo jin Gui-Qing Li School of Computer Science and Engineering South China University of TechnologyGuangzhou 510006China BlueFire AI CentralHong KongChina

In digital furniture design, skillful designers usually use professional software to create new furniture designs with various textures and then take advantage of rendering tools to produce eye-catching design results. Generally, a fine-grained furniture model holds many geometric details, inducing significant time cost to model rendering and large data size for storage that are not desired in application scenarios where efficiency is greatly emphasized. To accelerate the rendering process while keeping good rendering results as many as possible, we develop a novel decimation technique which not only reduces the number of faces on furniture models, but also retains their geometric and texture features. Two metrics are utilized in our approach to measure the distortion of texture features. Considering these two metrics as guidance for decimation, high texture distortion can be avoided in simplifying the geometric models. Therefore, we are able to build multi-level representations with different detail levels based on the initial design. Our experimental results show that the developed technique can achieve excellent visual effects on the decimated furniture model.

关键词： furniture design model decimation texture preservation progressive representation

Effect of diboron trioxide on the crushing strength and smelting mechanism of high-chromium vanadium–titanium magnetite pellets

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International Journal of Minerals,Metallurgy and Materials 2017年第11期24卷 1228-1240页

作者： Gong-jin Cheng Zi-xian Gao He Yang xiang-xin Xue School of Metallurgy Northeastern University Shenyang 110819 China Liaoning Key Laboratory of Recycling Science for Metallurgical Resources Shenyang 110819 China

The effect of diboron trioxide(B_2O_3) on the crushing strength and smelting mechanism of high-chromium vanadium–titanium magnetite pellets was investigated in this work. The main characterization methods were X-ray fluorescence, inductively coupled plasma–atomic emission spectroscopy, mercury injection porosimetry, X-ray diffraction, metallographic microscopy, and scanning electron microscopy–energy-dispersive X-ray spectroscopy. The results showed that the crushing strength increased greatly with increasing B_2O_3 content and that the increase in crushing strength was strongly correlated with a decrease in porosity, the formation of liquid phases, and the growth and recrystallization consolidation of hematite crystalline grains. The smelting properties were measured under simulated blast furnace conditions; the results showed that the smelting properties within a certain B_2O_3 content range were improved and optimized except in the softening stage. The valuable element B was easily transformed to the slag, and this phenomenon became increasingly evident with increasing B_2O_3 content. The formation of Ti(C,N) was mostly avoided, and the slag and melted iron were separated well during smelting with the addition of B_2O_3. The size increase of the melted iron was consistent with the gradual optimization of the dripping characteristics with increasing B_2O_3 content.

关键词： high-chromium vanadium–titanium magnetite pellets diboron trioxide crushing strength smelting mechanism