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Search Results: 1 - 10 of 11462 matches for " Hongtao Ye "
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Convergence Analysis of Particle Swarm Optimizer and Its Improved Algorithm Based on Velocity Differential Evolution
Hongtao Ye,Wenguang Luo,Zhenqiang Li
Computational Intelligence and Neuroscience , 2013, DOI: 10.1155/2013/384125
Abstract: This paper presents an analysis of the relationship of particle velocity and convergence of the particle swarm optimization. Its premature convergence is due to the decrease of particle velocity in search space that leads to a total implosion and ultimately fitness stagnation of the swarm. An improved algorithm which introduces a velocity differential evolution (DE) strategy for the hierarchical particle swarm optimization (H-PSO) is proposed to improve its performance. The DE is employed to regulate the particle velocity rather than the traditional particle position in case that the optimal result has not improved after several iterations. The benchmark functions will be illustrated to demonstrate the effectiveness of the proposed method. 1. Introduction Algorithms to tackle optimization problems include not only classical techniques such as dynamic programming, branch-and-bound, and gradient-based methods, but also more recent techniques such as metaheuristics [1]. Among the existing metaheuristic algorithms, the particle swarm optimization (PSO) algorithm is a population-based optimization technique developed by Kennedy and Eberhart in 1995 [2]. The PSO has resulted in a large number of variants of the standard PSO. Some variants are designed to deal with specific applications [3–6], and others are generalized for numerical optimization [7–10]. A hierarchical version of PSO (H-PSO) has been proposed by Janson and Middendorf [10]. In H-PSO, all particles are arranged in a tree that forms the hierarchy. A particle is influenced by its own best position and the best position particle in its neighborhood. It was shown that H-PSO performed very well compared to the standard PSO on unimodal and multimodal test functions [10, 11]. H-PSO presents the advantage of being conceptually very simple and requiring low computation time. However, the main disadvantage of H-PSO is the risk of a premature search convergence, especially in complex multiple peak search problems. A number of algorithms combined various algorithmic components, often originating from algorithms of other research areas on optimization. These approaches are commonly referred to as hybrid meta-heuristics [12]. The surveys on hybrid algorithms that combine the PSO and differential evolution (DE) [13] were presented recently [14, 15]. These PSO-DE hybrids usually employ DE to adjust the particle position. But the convergence performance is dependent on the particle velocity. Limiting the velocity can help the particle to get out of local optima traps [16, 17]. In this paper, we will combine
Single-Channel Compressive Sensing for DOA Estimation via Sensing Model Optimization  [PDF]
Hongtao Li, Zeshi Yuan
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2017, DOI: 10.4236/ijcns.2017.105B019
Abstract:
The performance of multi-channel Compressive Sensing (CS)-based Direction-of-Arrival (DOA) estimation algorithm degrades when the gains between Radio Frequency (RF) channels are inconsistent, and when target angle information mismatches with system sensing model. To solve these problems, a novel single-channel CS-based DOA estimation algorithm via sensing model optimization is proposed. Firstly, a DOA sparse sensing model using single-channel array considering the sensing model mismatch is established. Secondly, a new single-channel CS-based DOA estimation algorithm is presented. The basic idea behind the proposed algorithm is to iteratively solve two CS optimizations with respect to target angle information vector and sensing model quantization error vector, respectively. In addition, it avoids the loss of DOA estimation performance caused by the inconsistent gain between RF channels. Finally, simulation results are presented to verify the efficacy of the proposed algorithm.
Discussion on the Key Issues of Strategic Management of Corporate Social Responsibility in China  [PDF]
Jing Li, Hongtao Guo
Open Journal of Business and Management (OJBM) , 2018, DOI: 10.4236/ojbm.2018.64069
Abstract:
The main reason for the unsatisfactory performance of Chinese corporate social responsibility practice is that corporate managers still have different degrees of misunderstanding about corporate social responsibility. It is of great significance to clarify the existing problems in the management of corporate social responsibility and put forward scientific strategic management methods of corporate social responsibility.
Biodegradable Polymer-Coated, Gelatin Hydrogel/Bioceramics Ternary Composites for Antitubercular Drug Delivery and Tissue Regeneration
Mintao Xue,Hongtao Hu,Yuanquan Jiang,Jichun Liu,Hailong He,Xiaojian Ye
Journal of Nanomaterials , 2012, DOI: 10.1155/2012/530978
Abstract: A simple and effective strategy for the treatment of osteoarticular tuberculosis is proposed through combining tissue engineering approach with anti-tuberculosis drug therapy. A series of tricalcium phosphate bioceramics (TPB) composites, coated by degradable polymer outside and loaded with rifampicin (RFP)-containing gelatin hydrogel inside, were thus fabricated and successfully applied to deliver antitubercular drug RFP into osseous lesion and concomitantly to induce tissue regeneration. RFP-loaded gelatin hydrogel/TPB composites could be readily prepared by filling RFP-containing gelatin solution into TPB and then in situ crosslinking of gelatin with calcium ions. Depending on the concentrations of RFP, the loading efficiency of RFP in the composites varied in the range from approximately 2% to 5%. Moreover, the surface of these binary composites could be further coated by a biodegradable polymer, yielding biodegradable polymer-coated, RFP-containing gelatin hydrogel/TPB ternary composites. It was shown that in vitro release of RFP from the ternary composites could be effectively sustained for a long period of time. Besides, these composites revealed good biocompatibility towards the survival of MC-3T3 cells in vitro and could be used for tissue regeneration in vivo in a rabbit model. The results indicate that TPB ternary composites have great potential for the treatment of osteoarticular tuberculosis.
Expression of Fbxo7 in Haematopoietic Progenitor Cells Cooperates with p53 Loss to Promote Lymphomagenesis
Mikhail Lomonosov, El Kahina Meziane, Hongtao Ye, David E. Nelson, Suzanne J. Randle, Heike Laman
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0021165
Abstract: Fbxo7 is an unusual F box protein that augments D-type cyclin complex formation with Cdk6, but not Cdk4 or Cdk2, and its over-expression has been demonstrated to transform immortalised fibroblasts in a Cdk6-dependent manner. Here we present new evidence in vitro and in vivo on the oncogenic potential of this regulatory protein in primary haematopoietic stem and progenitor cells (HSPCs). Increasing Fbxo7 expression in HSPCs suppressed their colony forming ability in vitro, specifically decreasing CD11b (Mac1) expression, and these effects were dependent on an intact p53 pathway. Furthermore, increased Fbxo7 levels enhanced the proliferative capacity of p53 null HSPCs when they were grown in reduced concentrations of stem cell factor. Finally, irradiated mice reconstituted with p53 null, but not wild-type, HSPCs expressing Fbxo7 showed a statistically significant increase in the incidence of T cell lymphoma in vivo. These data argue that Fbxo7 negatively regulates the proliferation and differentiation of HSPCs in a p53-dependent manner, and that in the absence of p53, Fbxo7 expression can promote T cell lymphomagenesis.
Monitoring the Radiation Injury of Red Blood Cells to Micowave Radiation with Different Power Density  [PDF]
Junguang Yong, Ping Ruan, Hongtao Shen
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.510B092
Abstract:

Multiple state-of-the-art techniques, such as multi-dimensional micro-imaging, fast multi-channel micro-spetrophoto-metry, and dynamic micro-imaging analysis, were used to dynamically investigate various effects of cell under the 900MHzelectromagnetic radiation. Cell changes in shape, size under different power density electromagnetic waves radiation were presented in this paper. Experimental results indicated that the isolated human red blood cells (RBCs) do not have obviously real-time responses to the ultra-low density (15 μW/cm2, 31 μW/cm2) electromagnetic wave radiation when the radiation time is not more than 30 minutes; however, the cells do have significant reactions in shape, size to the electromagnetic waves radiation with power densities of 1 mW/cm2and 5 mW/cm2. The data reveals the possible influences and statistical relationships among living human cell functions, radiation amount and exposure time with high-frequency electromagnetic waves. The results of this study may be significant on protection of human being and other living organisms against possible radiation affections of the high-frequency electromagnetic waves.

Hierarchical Linear Model of Monthly Rainfall with Regional and Seasonal Interaction Effects  [PDF]
Yonghua Zhu, Hongtao Lu, Zilin Zhu
American Journal of Computational Mathematics (AJCM) , 2013, DOI: 10.4236/ajcm.2013.33B001
Abstract:

According to the hierarchical characteristics of monthly rainfall in different regions, the paper takes the geographical factors and seasonal factors into the hierarchical linear model as the level effect. Through clustering methods we select two more representative regional meteorological data. We establish three-layer model by transforming the interactive structure date into nested structure data. According the model theory we perform the corresponding model calculations, optimization and analysis, accordingly to interpret the level effects, and residual test. The results show that most of the difference in Monthly Rainfall was respectively explained by Variables (Meteorological factors, seasonal effects, geographic effects) in different levels.

The Growth of Two Species of Subalpine Co-nifer Saplings in Response to Soil Warming and Inter-Competition in Mt. Gongga on the South-Eastern Fringe of the Qinghai-Tibetan Plateau, China  [PDF]
Hongtao Song, Song Cheng, Yinsheng Zhang
World Journal of Engineering and Technology (WJET) , 2016, DOI: 10.4236/wjet.2016.43039
Abstract: In conjunction with global climate change, soil temperatures have been recorded to be increasing more rapidly than air temperatures at Mt. Gongga, China. Plant density is also increasing, and a means of combining the effects of changes in soil temperature and competition on the growth and regeneration of the constructive coniferous species seedlings in the subalpine ecotones is needed. Thus, a split-plot design experiment was conducted with Sargent spruce (Picea brachytyla) and Purple cone spruce (P. purpurea) saplings, using four soil temperatures (control Tsoil = 11.9 ± 0.3, low Tsoil = 13.4 ± 0.140, intermediate?Tsoil = 15.4 ± 0.1, high Tsoil = 16.4 ± 0.2) and three plant densities (one, two and three saplings per pot), in the subalpine ecotone. Soil temperatures were controlled through a cable heating system. After two growing seasons under the soil temperature treatments, 107 Sargent spruce saplings and 110 of the same-aged Purple cone spruce saplings were harvested. The results showed that Sargent spruce grew faster and with a greater biomass productivity than Purple cone spruce. Increased soil temperature significantly increased leaf biomass, branch biomass, above-ground biomass, and total plant biomass for developing crown architecture in Sargent spruce, whereas plant competition (i.e., higher density) notably caused a decline in leaf biomass, branch biomass, and above-ground biomass. Purple cone spruce did not respond to either an increases in soil temperature or plant competition. Neither plant species was influenced by the interaction of soil temperature and plant competition. These results suggest that Sargent spruce may expand the upper and lower limits of its distribution as global warming continues, but the expansion is likely to be restricted by plant competition in the future, including that from Purple cone spruce. Below-ground, fine root biomass does not change with soil warming although other sized roots do in both species. This signifies that light availability is more important in
Auto-Ubiquitination-Induced Degradation of MALT1-API2 Prevents BCL10 Destabilization in t(11;18)(q21;q21)-Positive MALT Lymphoma
Heidi Noels, Riet Somers, Hongxiang Liu, Hongtao Ye, Ming-Qing Du, Christiane De Wolf-Peeters, Peter Marynen, Mathijs Baens
PLOS ONE , 2009, DOI: 10.1371/journal.pone.0004822
Abstract: Background The translocation t(11;18)(q21;q21) is the most frequent chromosomal aberration associated with MALT lymphoma and results in constitutive NF-κB activity via the expression of an API2-MALT1 fusion protein. The properties of the reciprocal MALT1-API2 were never investigated as it was reported to be rarely transcribed. Principal Findings Our data indicate the presence of MALT1-API2 transcripts in the majority of t(11;18)(q21;q21)-positive MALT lymphomas. Based on the breakpoints in the MALT1 and API2 gene, the MALT1-API2 protein contains the death domain and one or both immunoglobulin-like domains of MALT1 (~90% of cases) - mediating the possible interaction with BCL10 - fused to the RING domain of API2. Here we show that this RING domain enables MALT1-API2 to function as an E3 ubiquitin ligase for BCL10, inducing its ubiquitination and proteasomal degradation in vitro. Expression of MALT1-API2 transcripts in t(11;18)(q21;q21)-positive MALT lymphomas was however not associated with a reduction of BCL10 protein levels. Conclusion As we observed MALT1-API2 to be an efficient target of its own E3 ubiquitin ligase activity, our data suggest that this inherent instability of MALT1-API2 prevents its accumulation and renders a potential effect on MALT lymphoma development via destabilization of BCL10 unlikely.
玄武岩发育区砂岩储层特征及控制因素:渤海南部BZ34-9区与KL6区块对比
Characterization and Controlling Factors of Sandstone Reservoirs in Basalt Development Areas: An Example from Comparison between BZ34-9 and KL6 Areas in South of Bohai Sea

王维,杨香华,叶加仁,王清斌,朱红涛,李欢
Wang Wei
, Yang Xianghua, Ye Jiaren, Wang Qingbin, Zhu Hongtao, Li Huan

地球科学(中国地质大学学报) , 2017, DOI: 10.3799/dqkx.2017.045
Abstract: 渤海南部BZ34-9区与KL6区块位于莱北低凸起南北两侧,均发育新生代玄武岩并得到钻井证实,但储层特征差异明显.以三维地震、薄片、SEM以及X衍射等技术手段对两个区块玄武岩时空展布,沉积体系以及储层特征进行对比.研究表明,BZ34-9区构造位于缓坡带,供源速率中等.渐新世玄武岩为沉积期及准同生期喷发且位于砂体主体部位,优质层段形成白云石包壳、沸石胶结溶蚀、混层粘土包膜等成岩响应,整体对储层发育发挥积极作用;KL6区构造近物源,供源强烈,渐新世玄武岩发育在凹陷内部,对砂体影响有限,储层以高岭石及碳酸盐胶结充填为特征,在成岩期受郯庐断裂带岩浆热液影响,绢云母、菱铁矿重结晶等现象普遍.对比分析表明玄武岩对储层的影响受控于火山喷发时机、物源供给速率、砂体及火山岩配置关系等因素.
BZ34-9 area and KL6 area are located in the north and south of Laibei low uplift, respectively in south of Bohai Sea. The characteristics of the sandstone reservoirs in the two areas are of great differences in spite of the similar background of Cenozoic basalt development which has been proven by drilling. The contrastive studies on structural background, temporal spacial distribution of basalt, sedimentary system and reservoir development have been taken combined with the analytical methods of 3D seismic data, well log, casting thin section observation, SEM, BSE and X-ray diffraction. For the BZ34-9 area, braided river deltas were deposited on a gentle slope at low depositional rates. Syndepositional basalt flows occur in the upper and lower parts of the sand body and high quality sandstone reservoirs are characterized by dolomite coats, zeolite cementation and dissolution, and mixed layer clay coats, which collectively had a positive impact on the reservoir quality. By contrast, the KL6 area was situated on a steep slope and fan delta deposition occurred at a high rate. The Neogene basalt focused on the middle of the basin and had limited influence on the sandstone reservoirs which is characterized by abundant kaolinite and carbonate cementation. The Oligocene strata of KL6 area which situated near Tan Lu fault zone has been greatly influenced by the Neogene basalt activities during the diagenesis stages. The magma and hydrothermal activity caused recrystallization of siderite, sericitization and prevailing precipitation of ferrodolomite. The basalt influence on the sandstone reservoirs are controlled by the time of eruption, source supply and the configuration of sandbody and basalt
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