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RELATIVE AND TATE COHOMOLOGY OF DING MODULES AND COMPLEXES
Chunxia Zhang 대한수학회 2015 대한수학회지 Vol.52 No.4
We investigate the relative and Tate cohomology theories with respect to Ding modules and complexes, consider their relations with classical and Gorenstein cohomology theories. As an application, the Avramov-Martsinkovsky type exact sequence of Ding modules is ob- tained.
Ding projective modules with respect to a semidualizing module
Chunxia Zhang,Limin Wang,Zhongkui Liu 대한수학회 2014 대한수학회보 Vol.51 No.2
In this paper, we introduce and discuss the notion of DC- projective modules over commutative rings, where C is a semidualizing module. This extends Gillespie and Ding, Mao’s notion of Ding projective modules. The properties of DC-projective dimensions are also given.
Screening and Cloning of RAPD Markers from the W Chromosome of Silkworm, Bombyx mori L.
Chunxia Zhang,Qin Yao,Qinggang Xu,Xudong Tang,Keping Chen 한국잠사학회 2004 International Journal of Industrial Entomology Vol.8 No.2
Silkworms sex determination drew high attention from researchers. Sex chromosomes on the silkworm are of ZW type for females and ZZ type for males. Chromosome W plays an important role in sex determination. Although several molecular linkage maps have been constructed for silkworm, very few markers are discovered on the W chromosome. In order to look for molecular markers and to further locate the Fem gene on chromosome W, we used genomic DNA from both female and male larvae of a silkworm strain named 937 as PCR templates for RAPD amplification with 200 arbitrary 10-mer primers. The amplification results showed three female-specific bands, namely OPG-07496, OPC-151,660 and OPE-181,279. Further verification, however, revealed no band from OPG-07 and OPC-15 in either sex in the strain 798, but OPE-18 provided female-specific band in the strains Suluan7 and C108, and absent in both males and strain 798. This indicates that the bands from OPG-07496 and OPC-151,660 are probably female-specific in strain 937, and the band from OPE-18 was probably amplified from a common segment shared by most strains. The genomic DNAs from OPG-07 and OPC-15 were cloned and sequenced. Sequence analysis showed that the DNAs from OPG-07 and OPC-15 have high identities with the retrotransposable elements, and DNA from OPC-15 contains a portion of sequence which probably encodes an eukaryotic translation initiation factor 4E binding protein (eIF4EBP).
Chunxia Zhu,Jing Wang,Zhiwen Chen,Bo Liu 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.12
This paper presents dynamic parameters identification analysis of a 3-TPT parallel manipulator with flexible links by means of simulationand experiment. The 3-TPT mechanism is described in detail, and the dynamic equations of the regarded mechanism are derivedanalytically based on the Newton’s second law. The dynamic simulation model of parallel manipulator with flexible links is built by theintegration method of virtual prototyping (VP) and finite element analysis (FEA), which forms the flexible multi-body system of parallelmanipulator. Frequency response curves are obtained by applied force on the simulation model, and the stiffness and damping ratio areidentified, respectively, from the simulation results. The strategy has been experimentally tested on an actual 3-TPT parallel manipulator. The compared results show that the errors are very small and reasonable scope, so it is feasible for the integration method used as referenceand basis for dynamic characteristic. Therefore, the integration simulation method provides a theoretical foundation and referencefor dynamic optimal design of parallel manipulator. These analyses and results provide valuable insight into the design and control of theparallel manipulator with flexible links.
Chunxia Jia,Detong Zhu 한국전산응용수학회 2011 Journal of applied mathematics & informatics Vol.29 No.1
In this paper, we construct a new approach of affine scaling interior algorithm using the affine scaling conjugate gradient and Lanczos methods for bound constrained nonlinear optimization. We get the iterative direction by solving quadratic model via affine scaling conjugate gradient and Lanczos methods. By using the line search backtracking technique, we will find an acceptable trial step length along this direction which makes the iterate point strictly feasible and the objective function nonmonotonically decreasing. Global convergence and local superlinear convergence rate of the proposed algorithm are established under some reasonable conditions. Finally, we present some numerical results to illustrate the effectiveness of the proposed algorithm..
Chunxia Chai,Qiao Wang,Sanjie Cao,Qin Zhao,Yiping Wen,Xiaobo Huang,Xintian Wen,Qiguai Yan,Xiaoping Ma,Rui Wu 대한수의학회 2018 Journal of Veterinary Science Vol.19 No.1
Japanese encephalitis virus (JEV) is a mosquito-borne, zoonotic flavivirus causing viral encephalitis in humans and reproductive disorder in swine. JEV is prevalent throughout China in human; however, spatiotemporal analysis of JEV in Chinese swine herds has not been reported previously. Herein, we present serological and molecular epidemiological results and estimates of prevalence of JEV infections among swine herds in various regions of China. The results suggest that JEV infections are widespread and genotype I and III strains co-exist in the same regions. Therefore, there is an urgent need to monitor JEV infection status among swine herds in China.
Chunxia You,Shen Zhang,Ran Zhang 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.12
This paper investigates a novel LED lamp arrangement to reduce SNR fluctuation in indoor visible light communication system. In VLC system, the signal sources often come from several LED lamps. The different positions of the LED lamps will influence the system quality. In our proposed scheme, the LED lamp arrangement consists of N LED lamps spreading in the ceiling. The heights of all lamps are the same of 3 meters which is the height of communication room. An optimal LED arrangement with the firework algorithm is presented for the minimum SNR factor and SNR fluctuation on the light receiver plane no matter the number of lamps. In order to compare the effect of SNR distributions, the total power of N LED lamps is identical. Our studies show that the SNR factor under such a LED arrangement is reduced from 118.5 to 4.09 with 16 LED lamps multi-input system which effectively reduces the SNR fluctuation between different users. Such arrangement guarantees all users obtain almost identical communication quality regardless of users’ locations.
Association Rule Mining Algorithm and College Wushu Teaching Reform based on Multimedia Technology
Chunxia Luo 보안공학연구지원센터 2016 International Journal of Database Theory and Appli Vol.9 No.11
With the rapid development of modern information technology, especially the development of the Internet, network brings a vast amount of data and information. The development of information technology has changed the education and learning methods, greatly improving our work and study efficiency. In this paper, the author analyzes the college wushu teaching reform based on multimedia technology. Based on multimedia platform, this paper constructs the martial arts teaching activities under the background of modern technology. This system realizes the combination of multimedia technology and the martial arts curriculum structure, content, and resources; it changes the traditional classroom teaching mode, and will improve the students' enthusiasm in wushu teaching.
Chunxia Wu,XIAOLIANG ZHANG,HONGWEI CHE,JINGBO MU,Guangshuo Wang,Zhixiao Zhang,Guohua Cui 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.4
In this work, nano-convex-patterned polyimide surface (notated as 1-sample) and nano-concavepatterned polyimide surface (notated as 2-sample) were prepared by self-assembly and etching. Atomic force microscope (AFM) with a colloidal probe was used to examine the adhesion and nano-tribological behavior of the 1-sample and 2-sample. Results suggest that the 1-sample and 2-sample can decrease the surface friction and adhesive forces because of the decreased contact area between the contacting pairs. The friction forces of the 1-sample and 2-sample increased with the increase in sliding velocity and applied load. Moreover, the nano-concave pattern is more effective in reducing the adhesive force than the nano-convex pattern because of its higher surface roughness. However, the nano-convex patterning is more effective in reducing the friction force than the nano-concave patterning because of the smaller area of contact between the 2-sample and the colloidal probe.
Chunxia Wu,Bin Zhao,Qiuhua Wu,Chun Wang,Zhi Wang,Yingli Li 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.3
A dispersive liquid-liquid microextraction based on solidification of floating organic droplet (DLLME-SFO)has been developed as a new approach for the extraction of trace copper in water and beverage samples followed by the determination with flame atomic absorption spectrometry. In the DLLME-SFO, 8-hydroxy quinoline, 1-dodecanol, and methanol were used as chelating agent, extraction solvent and dispersive solvent,respectively. The experimental parameters related to the DLLME-SFO such as the type and volume of the extraction and dispersive solvent, extraction time, sample volume, the concentration of chelating agent and salt addition were investigated and optimized. Under the optimum conditions, the enrichment factor for copper was 122. The method was linear in the range from 0.5 to 300 ng mL^(−1) of copper in the samples with a correlation coefficient (r) of 0.9996 and a limit of detection of 0.1 ng mL^(−1). The method was applied to the determination of copper in water and beverage samples. The recoveries for the spiked water and beverage samples at the copper concentration levels of 5.0 and 10.0 ng mL^(−1) were in the range between 92.0% and 108.0%. The relative standard deviations (RSD) varied from 3.0% to 5.6%.