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Search Results: 1 - 10 of 120056 matches for " Bu-Han Zhang "
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Limitation of Small-world Topology for Application in Non-dominated Sorting Differential Evolution
Junfang Li,Bu-han Zhang
TELKOMNIKA : Indonesian Journal of Electrical Engineering , 2012, DOI: 10.11591/telkomnika.v10i2.694
Abstract: In the context of complex network theory, the small-world network is famous for the small-world phenomenon, namely six degrees of separation. Different from its wide application in the social, physical and technological network analysis, it can be combined with the mathematical optimization algorithm recently. In this paper, the limitation of small-world network topology for application in multi-objective optimization algorithm is proposed. The optimization algorithm based on small-world network topology may be suitable for solving a few single-objective optimization problems, but has limitation and unobvious effectiveness to deal with many multi-objective optimization problems. This paper takes non-dominated sorting differential evolution algorithm (NSDE) based on small-world topology to solve eight multi-objective optimization problems (MOPs) for example. Compared with early NSDE algorithm, the limitation of the efficiency of small-world topology in NSDE is validated with the Matlab simulation results of eight MOEA test functions of early 2007. The results prove that small-world topology has limitation and unobvious effectiveness to improve a multi-objective optimization algorithm, not as good as to improve a single-objective optimization algorithm.
Harmonic Propagation and Interaction Evaluation between Small-Scale Wind Farms and Nonlinear Loads
Guang-Long Xie,Bu-Han Zhang,Yan Li,Cheng-Xiong Mao
Energies , 2013, DOI: 10.3390/en6073297
Abstract: Distributed generation is a flexible and effective way to utilize renewable energy. The dispersed generators are quite close to the load, and pose some power quality problems such as harmonic current emissions. This paper focuses on the harmonic propagation and interaction between a small-scale wind farm and nonlinear loads in the distribution grid. Firstly, by setting the wind turbines as P – Q( V) nodes, the paper discusses the expanding Newton-Raphson power flow method for the wind farm. Then the generalized gamma mixture models are proposed to study the non-characteristic harmonic propagation of the wind farm, which are based on Gaussian mixture models, improved phasor clustering and generalized Gamma models. After the integration of the small-scale wind farm, harmonic emissions of nonlinear loads will become random and fluctuating due to the non-stationary wind power. Furthermore, in this paper the harmonic coupled admittance matrix model of nonlinear loads combined with a wind farm is deduced by rigorous formulas. Then the harmonic propagation and interaction between a real wind farm and nonlinear loads are analyzed by the harmonic coupled admittance matrix and generalized gamma mixture models. Finally, the proposed models and methods are verified through the corresponding simulation models in MATLAB/SIMULINK and PSCAD/EMTDC.
Variation of wheatgrass chromosomes in wheat-wheatgrass alien addition line “TAI-27” revealed by fluorescencein situ hybridization (FISH)
Fangpu Han,Xiangqi Zhang,Xiuling Bu,Mengyuan He,Shui Hao,Youzhi Ma,Zhiyong Xin
Science China Life Sciences , 1998, DOI: 10.1007/BF02882735
Abstract: The Karyotyp of the primary wheat-whastgrass alien addition line TAI-27 was 2n = 44 in which all d the chromosomes were metacentric and subrmetacentric. However, in the progeny of TAI-27 a pair of chromosomes had become small chromosomea in the two morphologically different plants. Fluorescence in situ hybridizstionm (FISH) technique was used to analyze the two different plants. The observations indicate that a pair of small chromosomes in one varietion line are from wheatgrass. In another variation line, a pair of small chromosomes are also from whest-grass, while another pair of wheatgrass chromosomes have substituted the wheat chromosomes. TAI-27 and its variant lines showed a high level of resistance to barley yellow dwarf virus (BYDV). The pessible explanation for such a variation and the potential use of the variant lines were discussed briefly.
Review on Returnee—The Perspective of Dual Social Network, Knowledge Spillover and Institutional-Based View  [PDF]
Han Zhang
American Journal of Industrial and Business Management (AJIBM) , 2018, DOI: 10.4236/ajibm.2018.812157
Abstract: With the deepening and rapid development of China’s economy, returnees increasingly participate in the operation of enterprises. Based on the literature review of returnees, it is found that returnees have abundant tacit knowledge and special dual social network, which play an active role in innovation, entrepreneurship, internationalization and corporate governance. In addition, capability of management is affected by the institutional environment, so that the improvement of institutional environment can promote returnees to play their own advantages. On the basis of the literature review, two possible future research directions are proposed: a thorough study of returnees from the perspective of institutional-based view and ownership.
Increased Synaptophysin Is Involved in Inflammation-Induced Heat Hyperalgesia Mediated by Cyclin-Dependent Kinase 5 in Rats
Hong-Hai Zhang, Xiao-Qin Zhang, Wen-Yuan Wang, Qing-Sheng Xue, Han Lu, Jin-Lu Huang, Ting Gui, Bu-Wei Yu
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0046666
Abstract: Mechanisms associated with cyclin-dependent kinase 5 (Cdk5)-mediated heat hyperalgesia induced by inflammation remain undefined. This study was designed to examine whether Cdk5 mediates heat hyperalgesia resulting from peripheral injection of complete Freund's adjuvant (CFA) in the spinal dorsal horns of rats by interacting with synaptophysin, a well known membrane protein mediating the endocytosis-exocytosis cycle of synaptic vesicles as a molecular marker associated with presynaptic vesicle membranes. The role of Cdk5 in mediating synaptophysin was examined through the combined use of behavioral approaches, imaging studies, and immunoprecipitation following CFA-induced inflammatory pain. Results showed that Cdk5 colocalized with both synaptophysin and soluble N-ethylmaleimide-sensitive factor (NSF) attachment protein receptors (SNAREs) consisting of VAMP-2, SNAP-25, and syntaxin 1A in spinal dorsal horn of rats. Increased synaptophysin expression of spinal cord horn neurons post intraplantar injection of CFA coincided with increased duration of heat hyperalgesia lasting from 6 h to 3 d. Intrathecal administration of roscovitine, a Cdk5 specific inhibitor, significantly depressed synaptophysin expression during peak heat hyperalgesia and heat hyperalgesia induced by peripheral injection of CFA. Data presented in this report indicated that calpain activity was transiently upregulated 6 h post CFA-treatment despite previous reports suggesting that calpain was capable of cleaving p35 into p25. Results from previous studies obtained by other laboratories demonstrated that significant changes in p35 expression levels within spinal cord horn neurons were not observed in the CFA-treated inflammatory pain model although significant upregulation of Cdk5 kinase was observed between 2 h to 7 d. Therefore, generation of p25 occurred in a calpain-independent fashion in a CFA-treated inflammatory pain model. Our results demonstrated that increased synaptophysin levels were involved in heat hyperalgesia mediated by Cdk5 in spinal cord dorsal horns of CFA-treated rats, suggesting that inhibiting abnormal activation of Cdk5-synaptophysin may present a novel target for diminishing inflammatory pain.
A Communication Middleware with Unified Data Transmission Interface  [PDF]
Yu Zhang, Yuanbing Zhang, Xiangyuan Bu, Chao Zhang
Communications and Network (CN) , 2013, DOI: 10.4236/cn.2013.51B009
Abstract: In a Modern communication network, data exchange become a complex problem because there usually exists a various data formats due to the diversity and complexity of communication devices. In this paper, a communication middleware with unified data transmission interface is introduced, which acts as the abstract communication layer in the heterogeneous distributed private communication network. Devices within the network only need to interact with the middleware, instead of directly communicate with each other by various protocols and interfaces, which can reduce the complexity and diversity of the heterogeneous network. This article describes the structure and features of the middleware, and analyses the use of “buffer pool” in message sending and receiving process. The applications of this middleware can reduce the complexity of heterogeneous network interoperation, and improve communication efficiency.
The BDNF/TrkB Signaling Pathway Is Involved in Heat Hyperalgesia Mediated by Cdk5 in Rats
Hong-Hai Zhang, Xiao-Qin Zhang, Qing-Sheng Xue, Yan-Luo, Jin-Lu Huang, Su Zhang, Hai-Jun Shao, Han Lu, Wen-Yuan Wang, Bu-Wei Yu
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0085536
Abstract: Background Cyclin-dependent kinase 5 (Cdk5) has been shown to play an important role in mediating inflammation-induced heat hyperalgesia. However, the underlying mechanism remains unclear. The aim of this study was to determine whether roscovitine, an inhibitor of Cdk5, could reverse the heat hyperalgesia induced by peripheral injection of complete Freund's adjuvant (CFA) via the brain-derived neurotrophic factor (BDNF)-tyrosine kinase B (TrkB) signaling pathway in the dorsal horn of the spinal cord in rats. Results Heat hyperalgesia induced by peripheral injection of CFA was significantly reversed by roscovitine, TrkB-IgG, and the TrkB inhibitor K252a, respectively. Furthermore, BDNF was significantly increased from 0.5 h to 24 h after CFA injection in the spinal cord dorsal horn. Intrathecal adminstration of the Cdk5 inhibitor roscovitine had no obvious effects on BDNF levels. Increased TrkB protein level was significantly reversed by roscovitine between 0.5 h and 6 h after CFA injection. Cdk5 and TrkB co-immunoprecipitation results suggested Cdk5 mediates the heat hyperalgesia induced by CFA injection by binding with TrkB, and the binding between Cdk5 and TrkB was markedly blocked by intrathecal adminstration of roscovitine. Conclusion Our data suggested that the BDNF-TrkB signaling pathway was involved in CFA-induced heat hyperalgesia mediated by Cdk5. Roscovitine reversed the heat hyperalgesia induced by peripheral injection of CFA by blocking BDNF/TrkB signaling pathway, suggesting that severing the close crosstalk between Cdk5 and the BDNF/TrkB signaling cascade may present a potential target for anti-inflammatory pain.
Pb Distribution and Sources in Jiaozhou Bay, East China  [PDF]
Dongfang Yang, Junhui Guo, Yinjiang Zhang, Ziru Ding, Zhiguo Bu
Journal of Water Resource and Protection (JWARP) , 2011, DOI: 10.4236/jwarp.2011.31005
Abstract: We studied the distribution, seasonal change, translocation, and source of heavy metal Pb based on the surface and bottom water sampling in Jiaozhou Bay in 1980 in order to know the condition of Pb before the industrial and agricultural development and to probe the distribution and translocation process of Pb. The results show that the range of Pb content in the surface in the whole bay was 0.07-2.71 μg/L, being below Grade Ⅱ of the China’s national water quality benchmark (5.00 μg/L). No Pb pollution was detected in the inner bay, while in the outer bay and the mouth, light Pb pollution. The Pb pollution in the bay waters was area sources. Horizontal and vertical distribution, and seasonal change indicated the translocation of Pb in the waters. Pb entered the water body at marine surface and sank at the marine bottom. Understanding the variable process of Pb in the bay provided the scientific clues for controlling Pb pollution from the human activities.
The Impact of Terms of Trade Changes on Economic Welfare: Evidence from China  [PDF]
Jinghua Han, Zhihui Zhang
Modern Economy (ME) , 2012, DOI: 10.4236/me.2012.34055
Abstract: Based on the statistics of 1993-2010, this paper analyzes the changing trend and causes of terms of trade in China and studies the overall movement in China’s national wealth by introducing the GDI index under SNA accounting framework. This paper analyzes the relevance between export and real GDP by using the Pearson correlation and partial correlation method, with the final consumption as the economic welfare evaluation index. This paper also presents the change of national wealth by using the weak axiom of revealed preference theory. The result of the study shows that, China’s economic growth is not strongly dependent on exports. It is the export structure of labor intensive products with low price elasticity that mainly lead to the continuously decline of terms of trade in China. However the loss of welfare from the terms of trade’s decline is not enough to offset the benefits of the economic growth. Therefore there is no probability of “Immiserizing Growth” in China’s foreign trade.
Co-Movement and Interaction Effects across the Monetary, Foreign Exchange and Stock Markets: Evidence from China  [PDF]
Xuejin Zhao, Han Zhang
Journal of Financial Risk Management (JFRM) , 2017, DOI: 10.4236/jfrm.2017.63018
Abstract: This paper investigates the issue of co-movement and interaction among the monetary, foreign exchange and stock markets by employing the data from China’s financial markets. Based on the ICA-EGARCH-M model, we explore the volatility spillover effects so as to illustrate the overall co-movements across financial markets. Furthermore, in order to observe the multi-market dynamic relationship variation process, we calculate the dynamic correlation coefficients with the AG-DCC-MGARCH model. Our findings provide both static and dynamic evidence on the co-movement and interaction effects of financial markets which may lead to the systemic financial risk.
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