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Search Results: 1 - 10 of 4289 matches for " Dehui Kong "
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Connectivity-preserving Geometry Images
Shaofan Wang,Dehui Kong,Juan Xue,Weijia Zhu,Min Xu,Baocai Yin,Hubert Roth
Computer Science , 2013,
Abstract: We propose connectivity-preserving geometry images (CGIMs), which map a three-dimensional mesh onto a rectangular regular array of an image, such that the reconstructed mesh produces no sampling errors, but merely round-off errors. We obtain a V-matrix with respect to the original mesh, whose elements are vertices of the mesh, which intrinsically preserves the vertex-set and the connectivity of the original mesh in the sense of allowing round-off errors. We generate a CGIM array by using the Cartesian coordinates of corresponding vertices of the V-matrix. To reconstruct a mesh, we obtain a vertex-set and an edge-set by collecting all the elements with different pixels, and all different pairwise adjacent elements from the CGIM array respectively. Compared with traditional geometry images, CGIMs achieve minimum reconstruction errors with an efficient parametrization-free algorithm via elementary permutation techniques. We apply CGIMs to lossy compression of meshes, and the experimental results show that CGIMs perform well in reconstruction precision and detail preservation.
Field-based crowd simulation
基于场的人群运动仿真

Zhao Xinxin,Zhang Yong,Kong Dehui,Yin Baocai,
赵欣欣
,张勇,孔德慧,尹宝才

中国图象图形学报 , 2013,
Abstract: 人群仿真目前在工业、建筑、交通等多种领域中应用广泛。实现复杂场景中的人群运动实时仿真,效率是亟待解决的关键性问题,而提高仿真效率所必须面临的挑战主要有人群的渲染、位置及状态的实时更新和碰撞检测。提出一种基于场的方法来实现人群运动的实时仿真,通过构建导航场和密度场引导人群运动。导航场能够引导人群按最优可行路径到达其目标位置;而密度场通过对人群运动速度的影响,再与基于GPU的碰撞检测方法结合,有效地避免了人群碰撞。应用基于场的方法,搭建了人群运动实时仿真系统,在复杂的场馆中对几千人规模的人群进行了实验,成功地对人群进行疏散。实验结果表明,本文方法能够获得良好的渲染效果和仿真效率。
Effects of low pH on zooplankton in some suburban waterbodies of Chongqing City
Zhuang Dehui,
Zhuang
,Dehui

环境科学学报(英文版) , 1995,
Abstract: Samples of zooplankton were collected for 4 times from May,1989 to May,1992 in some subur- ban waterbedies of Chongqing City, a heavy acid rain area in the southwest China. The qualitative and quanti- tative analysis results indicated that the species of zooplankton(y)were found to decIine gradually with a re- duction of pH value(x)ranging from 4.01 to 8.80. The regression equation of relation between them may be expressed as: y=1.520x-2.488(r=0.61, P<0.01,n=22)with respect to abundance of zooplankton,the mean density was abundant(3609. 23 ind./L)at pH ranging from 5.0 to 8.8,but was lower(151.50 ind./L)at pH ranging from 4.0 to 5.0. The evidence presented suggests that effects of low pH on zooplank- ton is the greatest below pH 5.0.
Agrobacterium tumefaciens-mediated transformation as a tool for insertional mutagenesis in thermophilic fungus Thermomyces lanuginosus
农杆菌介导的获取疏绵状嗜热丝孢菌插入突变体体系的建立

Hua Han,Xiaoxue Xu,Yanjie Peng,Dehui Kong,Duochuan Li,
韩华
,徐晓雪,彭延杰,孔德慧,李多川

微生物学报 , 2012,
Abstract: 摘要:【目的】建立疏绵状嗜热丝孢菌的稳定遗传转化体系并获得插入突变体。【方法】利用农杆菌介导的方法建立疏绵状嗜热丝孢菌的遗传转化体系;分别通过Southern杂交、克隆转移DNA(T-DNA)侧翼序列来确定T-DNA 在疏绵状嗜热丝孢菌基因组中的拷贝数和插入位点。【结果】成功建立了可靠的疏绵状嗜热丝孢菌的遗传转化体系。共培养过程中使用萌发孢子是成功建立疏绵状嗜热丝孢菌遗传转化体系的必要条件。疏绵状嗜热丝孢菌萌发的孢子与农杆菌在28℃共培养48h时,转化效率最高。乙酰丁香酮(AS)在农杆菌预培养及疏绵状嗜热丝孢菌萌发的孢子与农杆菌的共培养阶段都是必需的,且在共培养阶段当AS浓度为500 μM时转化效率最高。Southern 杂交验证表明,79.2%的转化子为T-DNA单拷贝插入,且通过热不对称PCR(TAIL-PCR)分析得出T-DNA在该菌基因组中的插入位点是随机的。通过该转化系统筛选到部分表型突变体。【结论】我们首次报道了利用ATMT技术成功转化嗜热真菌-疏绵状嗜热丝孢菌,证明了该方法是一种简单有效的获得插入突变体的方法,并为该嗜热真菌进行基因定位提供了工具。
边坡可靠度分析中岩土合理样本数目探讨
Study on the geotechnical number of samples in slope reliability analysis

赵晶,蒋良潍,罗强,骆飞,孔德惠,
ZHAO Jing
,JIANG Liangwei,LUO Qiang,LUO Fei,KONG Dehui

- , 2016,
Abstract: 土工参数由有限样本数目勘察取样试验结果的估计推断而得到,统计不确定性将对可靠度分析结果带来误差,因此合理样本数目应体现分析结果精度与勘察费用间矛盾的协调。基于从土工参数总体分布中随机抽样的方法模拟某一样本容量下的勘察取样试验,以120次重复抽样构建样本统计值空间,分析样本统计值及对应边坡可靠度指标的离散特征。根据样本容量对可靠度指标计算结果空间散布范围的约束效应,探讨土工强度参数变异水平呈小、中和大3个等级时相对应的合理样本数目。计算分析表明:样本数目增加可减小可靠指标分布的离散程度,土工参数变异性增大则反之;为保证可靠度分析结果精度,在土工参数变异性增大条件下须相应增加样本数目;可靠度指标变异系数取0.30时,对应于参数呈小、中和大变异水平的样本数目分别为6,11和18。研究成果对完善工程勘察中的土工试验取样数目有一定参考价值。
Soil parameters were estimated by the survey test of limited sample number and its statistical uncertainty would lead to the error of reliability analysis. Thus a number of samples should be considered in terms of survey cost and precision. Based on the method of random sampling from the total soil parameters to simulate the survey under certain sample number, the sample statistical value and the discrete features of slope reliability index correspondingly are analyzed with 120 times sampling. Based on the influence of sample number on discrete features of slope reliability index, the number of sample corresponding to three levels of soil parameters is discussed. The analysis result shows that the increased number of samples would lead to the small dispersion degree of reliability index, and the increasing variability of parameters would tead to the opposite result. In order to ensure the accuracy of the results, the number of sample should increase with the increase of reliability index of soil parameters. According to small, medium and large variation levels of soil parameters, the required number of samples are found to be 6, 11 and 18 seperately when the coefficient of variation is 0.30. Research provides reference on the soil test of engineering survey
The use of metaphors in academic communication: traps or treasures
Dehui Zhou,Edgar Heineken
Ibérica , 2009,
Abstract: The rationalists and the empiricists in the 17th century once argued that metaphor is an inferior device to convey objective truth and should be replaced by literal statements. On the one hand, this article shares Lakoff and Johnson’s (1980 & 1999) view that metaphor is useful to pursue experiential truth and explains why “metaphors are necessary and not just nice” (Ortony, 1975: 45). On the other hand, it reports a cognitive psychological experiment, which shows that metaphor comprehension can be greatly influenced by people’s pre-existing conceptual knowledge and the context, in which the metaphor appears. The authors advocate a conscious use of metaphors in academic communication with full awareness of the factors that may influence metaphor comprehension.
Utilizing NMR Mud Logging Technology To Measure Reservoir Fundamental Parameters in Well Site  [PDF]
Yingzhao Zheng, Dehui Wan, Muhammad Ayaz, Caiqin Ma
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B285
Abstract:

Nuclear Magnetic Resonance mud logging technology (NMR mud logging) is a new mud logging technology. Mainly applies the CPMGCarr-Purcell-Meiboom-Gillpulse sequence to measure transverse relaxation time (T2) of the fluid. NMR mud logging can measure drill cutting, core and sidewall core in the well site, also according to the experiment results, the sample type and size has little effect to analysis result. Through NMR logging, we can obtain several petrophysical parameters such as total porosity, effective porosity, permeability, oil saturation, water saturation, movable fluid saturation, movable oil saturation, movable water saturation, irreducible fluid saturation, irreducible oil saturation, irreducible water saturation, pore size and distribution in rock samples, etc. NMR mud logging has been used nearly 10 years in China, Sudan, Kazakhstan, etc. it plays an important role in the interpretation and evaluation of reservoir and its fluids.

Fault Ride-Through Capability Enhancement of PV System with Voltage Support Control Strategy  [PDF]
Dehui Zeng, Gang Wang, Guoqing Pan, Haifeng Li
Open Journal of Applied Sciences (OJAppS) , 2013, DOI: 10.4236/ojapps.2013.32B006
Abstract: With continuously increasing of photovoltaic (PV) plant’s penetration, it has become a critical issue to improve the fault ride-through capability of PV plant. This paper refers to the German grid code, and the PV system is controlled to keep grid connected, as well as inject reactive current to grid when fault occurs. The mathematical model of PV system is established and the fault characteristic is studied with respect to the control strategy. By analyzing the effect of reactive power supplied by the PV system to the point of common coupling (PCC) voltage, this paper proposes an adaptive voltage support control strategy to enhance the fault ride-through capability of PV system. The control strategy fully utilizes the PV system’s capability of voltage support and takes the safety of equipment into account as well. At last, the proposed control strategy is verified by simulation.
ACGA Algorithm of Solving Weapon - Target Assignment Problem  [PDF]
Jiuyong Zhang, Xiaojing Wang, Chuanqing Xu, Dehui Yuan
Open Journal of Applied Sciences (OJAppS) , 2012, DOI: 10.4236/ojapps.2012.24B018
Abstract: Weapon Target Assignment is not only an important issue to use firepower, but also an important operational decision-making problem. As new intelligent algorithms, Genetic algorithm and ant colony algorithm are applied to solve Weapons-Target Assignment Problem. This paper introduces the Weapon-Target Assignment (WTA) and the mathematical model, and proposes ACGA algorithm which is the integration of genetic algorithm and ant colony algorithm then use ACGA algorithm to solve the Weapon-Target Assignment Problem. Calculations show that: when ACGA algorithm is used to solve Weapon – Target Assignment Problem, it has fast convergence and high accuracy.
一种基于ls-svm的特征提取新方法及其在智能质量控制中的应用
吴德会,dehui,wu
计算机应用 , 2006,
Abstract: ?提出一种基于最小二乘支持向量机(ls-svm)的特征提取新方法,并将其成功应用到智能质量控制领域。首先,将线性特征提取公式表达成与ls-svm回归算法中相同的形式;再遵循svm方法将数据集由原输入空间映射到高维特征空间,进而使用该技巧通过线性形式实现非线性特征提取。然后,用常规控制图提取出一个含有6种模式、50维特征的仿真数据集用于测试,通过ls-svm特征提取后,原数据集的特征被降到了3维并保留了原80%的分类信息。最后,用bp分类器对特征提取后的样本进行识别,其结果优于新型rsfm网络直接对原始样本进行识别的效果。仿真实验结果表明了ls-svm特征提取方法的可行性和有效性。
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