oalib

OALib Journal期刊

ISSN: 2333-9721

费用:99美元

投稿

时间不限

2017 ( 86 )

2016 ( 91 )

2015 ( 1244 )

2014 ( 1847 )

自定义范围…

匹配条件: “SONG Chuan-ming” ,找到相关结果约47052条。
列表显示的所有文章,均可免费获取
第1页/共47052条
每页显示
The Greedy Algorithm of the Longest Nesting of d-Dimension Boxes
最长d维箱嵌套问题的贪心算法

SONG Chuan-Ming WANG Xiang-Hai,
宋传鸣
,王相海

计算机科学 , 2003,
Abstract: The Greedy algorithm is a simple,direct and efficient method to many problems. In this paper,the longest nesting problem of d-dimension boxes is brought up firstly. And then a novel algorithm for this problem based on greedy strategy is proposed. Finally, the time complexity of the proposed algorithm is analyzed. Simulation results show it is effective.
Visually Lossless Accuracy of Motion Vector in Overcomplete Wavelet-based Scalable Video Coding
Chuan-Ming Song,Xiang-Hai Wang,Fu-Yan Zhang
Journal of Computers , 2009, DOI: 10.4304/jcp.4.9.821-828
Abstract: In this paper, we propose a visually lossless accuracy model for scalable coding of motion vectors in overcomplete wavelet-based scalable video codec. By exploiting theory of stationary random process, we first estimate motion compensation errors in spatial domain due to inaccurate motion vectors. We then extend the results to overcomplete wavelet domain, and further derive the errors caused by fraction-pixel motion vectors. Finally, combining with a visibility model of wavelet coefficient errors, we propose a novel algorithm to estimate the accuracy threshold of motion vectors with which motion compensation errors will be invisible. Experimental results show that our algorithm is effective in estimating visually lossless accuracy threshold of motion vectors. The proposed algorithm can also be used in scalable motion estimation in wavelet domain. It can accelerate motion estimation speed by stopping halfway at the accuracy that will not cause any visible errors.
Research on Dynamics Particles Modeling of Water into Vessel
水体注入器皿的动力学粒子建模研究

SONG Chuan-ming,LI Ting-ting,WANG Xiang-hai,CHENG Chen,
宋传鸣
,李婷婷,王相海,成琛

计算机科学 , 2013,
Abstract: 基于物理过程的建模方式能够真实地模拟流体的运动状态,表现出很好的模拟效果,但对不同的流体形态以及同一种流体的不同细节状况,所涉及到的细节属性参数也不同,通常存在着较大的建模差异。首先对流体动力学的流体模拟原理进行了分析,在此基础上对水体倒入4种不同形状容器的流体动力学平滑粒子模型进行了研究,提出一种基于分块的邻居粒子搜索方法,以提高在空间均匀网格上对邻居粒子的搜索速度,给出了流体与器皿碰撞的判断与响应方法。最后通过水体注入不同器皿的仿真试验验证了所建立模型的有效性。
Binary Alpha-Plane Assisted Fast Motion Estimation Scheme of Video Object
二值alpha平面辅助的视频对象快速运动估计算法

SONG Chuan-Ming,WANG Xiang-Hai,ZHANG Fu-Yan,
宋传鸣
,王相海,张福炎

软件学报 , 2008,
Abstract: This paper proposes a fast motion estimation scheme of arbitrarily shaped video object. The instructive role of the alpha-plane taking part in the motion estimation of video object is discussed, and a weighted binary alpha-plane matching criterion (WBAMC) is proposed by using boundary extension and boundary mask techniques. Based on priority search strategy, this paper proposes a fast binary alpha-plane assisted motion estimation (BAAME) scheme of video object. First, the BAAME uses alpha-plane and the WBAMC criterion to limit the search of boundary macro-blocks (MBs) into small unimodal area of two starting points so that a conventional fast motion estimation algorithm can be employed to search the motion vectors (MVs) of boundary MBs. Second, the BAAME predicts the starting points of opaque MBs by using MVs of neighboring boundary MBs and then employs a fast motion estimation algorithm to compute the MVs of opaque MBs. The proposed scheme can be combined with many spatial domain based and frequency domain based different motion estimation algorithms, and be effectively applied to object-based video codecs. The experimental results show that the BAAME scheme can always reach high motion estimation accuracy and better subjective quality for standard test video sequences which have different characteristics respectively. The proposed scheme can achieve 0.1~0.8dB higher prediction quality on average than DS (diamond search) and PSA (priority search algorithm) (BAAS (binary alpha-plane assisted search)+DS), and a little lower PSNR (peak signal-to-noise ratio) than FS (full search). Moreover, the BAAME scheme can speed up the motion estimation about 20 times in terms of computational complexity when compared with FS.
Diaquabis[4-(1H-imidazol-2-yl)pyridine-κN]bis(nitrato-κO)cadmium
Chuan-Yue Zhang,Tao Wang,Chuan-Ming Jin
Acta Crystallographica Section E , 2013, DOI: 10.1107/s1600536812050908
Abstract: In the title compound, [Cd(NO3)2(C8H7N3)2(H2O)2], the CdII cation is situated on an inversion center and is coordinated by the O atoms of two nitrate anions, by the N atoms of two 4-(imidazol-2-yl)pyridine ligands and by two water O atoms in a slightly distorted N2O4 octahedral geometry. The dihedral angle between the imidazole and pyridine rings is 1.6 (2)°. In the crystal, molecules are linked by N—H...O, O—H...N and O—H...O hydrogen bonds, forming a three-dimensional network.
Distributed Continuous k Nearest Neighbors Search over Moving Objects on Wireless Sensor Networks
Chuan-Ming Liu,Chuan-Chi Lai
International Journal of Distributed Sensor Networks , 2013, DOI: 10.1155/2013/125145
Abstract: Continuous k-nearest neighbor (CkNN) search is a variation of kNN search that the system persistently reports k nearest moving objects to a user. For example, system continuously returns 3 nearest moving sensors to the user. Many query processing approaches for CkNN search have been proposed in traditional environments. However, the existing client-server approaches for CkNN search are sensitive to the number of moving objects. When the moving objects quickly move, the processing load on the server will be heavy due to the overwhelming data. In this thesis, we propose a distributed CkNN search algorithm (DCkNN) on wireless sensor networks (WSNs) based on the Voronoi diagram. There are four features about DCkNN: (1) each moving object constructs a local Voronoi cell and keeps the local information; (2) in order to keep the reliability of system, the query message will be propagated to related objects; (3) using the idea of safe time, the number of updates is reduced; (4) an equation to estimate a more accurate safe time is provided. Last, we present our findings through intensive experiments and the results validate our proposed approach, DCkNN. 1. Introduction The mobile sensors have been widely used in recent years. For example, the smartphone, Samsung Galaxy S4, includes a barometer, thermometer, and hygrometer (to measure humidity)—the first major smartphone to do so. By using these sensors, people can easily use their mobile devices to obtain environmental information. On the other hand, the popularization of global positioning system (GPS) and the miniaturization of mobile devices, equipped with a wireless network module, make location-based services (LBSs) no longer expensive. Thus, with the combination of the mobile sensors and the GPS, more and more interesting applications and issues gradually emerged. In general, one can regard each mobile device (sensor) as a moving object in wireless mobile sensor networks. Each user (object) can use the GPS and sensors to provide the environmental information, such as location, temperature, and humidity, to the information systems which are built by the manufacturers. These systems can sink user’s information and send the user’s location through the mobile networks. Mobile users can immediately access the information related to the location and geographic information. Many manufacturers even provide different telecommunication services to the users, The multiple types of information services make life more convenient. For example, if a user issues a query and wants to know the temperature at a specific
Analysis and evaluation of ecological landscape pattern of Tianbaoyan Nature Reserve of Fujian
福建省天宝岩自然保护区景观生态格局分析及评价

CHEN Chuan-Ming,
陈传明

中国生态农业学报 , 2008,
Abstract: 根据景观生态学原理,在RS、GIS软件支持下提取景观斑块的数量、面积、周长等信息,对福建省天宝岩国家级自然保护区的景观生态格局进行分析;并利用层次分析法,选取多样性、稀有性、自然性、代表性、面积适宜性、人类干扰、稳定性等7项指标对该自然保护区进行景观生态评价.结果表明:常绿阔叶林、常绿针叶林和常绿针阔混交林是研究区的主导景观类型且破碎化程度低,植被的保护较完整;居民点的斑块数多,孔隙度最大,对景观类型的形成有主要的影响;景观类型多样性以类型斑块数最大,类型面积最小.福建省天宝岩国家级自然保护区景观生态质量的综合评价指数为0.819,说明该自然保护区的景观生态质量较好.
Dynamical entanglement for Fermi coupled stretching and bending modes

Hou Xi-Wen,Cheng Chuan-Ming,

中国物理 B , 2009,
Abstract: The dynamical entanglement for Fermi coupled C--H stretch and bend vibrations in molecule CHD3 is studied in terms of two negativities and the reduced von Neumann entropy, where initial states are taken to be direct products of photon-added coherent states on each mode. It is demonstrated that the negativity defined by the sum of negative eigenvalues of the partial transpose of density matrices is positively correlated with the von Neumann entropy. The entanglement difference between photon-added coherent states and usual coherent states is discussed as well.
catena-Poly[[silver(I)-μ-bis{2-[(E)-phenyldiazenyl]-1H-imidazol-1-yl}methane] trifluoromethanesulfonate]
Tao Wang,Ji-Jun Xu,Chuan-Ming Jin
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811035951
Abstract: The title compound, {[Ag(C19H16N8)](CF3SO3)}n, is a coordination polymer with cationic chain motif. The Ag+ cation is coordinated by two unsubstituted imidazolyl N atoms of two independent 2-paBIM ligands [2-paBIM is bis{2-[(E)-phenyldiazenyl]-1H-imidazol-1-yl}methane]. The shortest Ag...Ag separation in a cationic chain is 8.841 (2) and the dihedral angle between two 2-phenyldiazenyl-imidazole planes in the same ligand is 74.7 (3)°. Weak C—H...O interactions are seen in the crystal.
3-Mesityl-2-oxo-1-oxaspiro[4.4]non-3-en-4-yl benzoate
Chuan-ming Yu,Zong-cheng Wang,Huan Zhou,Ming-hua Ji
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810021343
Abstract: In the title compound, C24H24O4, a derivative of the potent insecticide and miticide spiromesifen, one cyclopentane C atom is disordered over two positions with occupancies of 0.574 (12) and 0.426 (12), resulting in respective envelope and twisted conformations for the cyclopentane ring. The atom at the flap position is 0.620 (5) out of the mean plane formed by the other four atoms of the envelope form. The furan ring makes dihedral angles of 68.26 (3) and 69.38 (2)°, respectively, with the 2,4,6-trimethylphenyl and benzene rings. The dihedral angle between the two benzene rings is 62.27 (3)°.
第1页/共47052条
每页显示


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.