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Search Results: 1 - 10 of 145708 matches for " ZHANG Xiao-Ping "
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An Automated Video Object Extraction System Based on Spatiotemporal Independent Component Analysis and Multiscale Segmentation
Zhang Xiao-Ping,Chen Zhenhe
EURASIP Journal on Advances in Signal Processing , 2006,
Abstract: Video content analysis is essential for efficient and intelligent utilizations of vast multimedia databases over the Internet. In video sequences, object-based extraction techniques are important for content-based video processing in many applications. In this paper, a novel technique is developed to extract objects from video sequences based on spatiotemporal independent component analysis (stICA) and multiscale analysis. The stICA is used to extract the preliminary source images containing moving objects in video sequences. The source image data obtained after stICA analysis are further processed using wavelet-based multiscale image segmentation and region detection techniques to improve the accuracy of the extracted object. An automated video object extraction system is developed based on these new techniques. Preliminary results demonstrate great potential for the new stICA and multiscale-segmentation-based object extraction system in content-based video processing applications.
On the Shift Operator and Optimal Filtering in Graph Signal Processing
Adnan Gavili,Xiao-Ping Zhang
Mathematics , 2015,
Abstract: Defining a sound shift operator for signals existing on a certain graph structure, similar to the well-defined shift operator in classical signal processing, is a crucial problem in graph signal processing. Since almost all operations, such as filtering, transformation, prediction, etc., are directly related to the graph shift operator. We define a unique set of shift operators that satisfy all properties of the shift operator in the classical signal processing, especially energy preservation property. Our definition of the graph shift operator negates the shift operators defined in the literature, such as the \textit{graph adjacency matrix} as the shift operator, and \textit{Laplacian matrix} based shift operators, etc., which modify the energy of a graph signal. We further show that any shift invariant graph filter can be written as a polynomial function of the graph shift operator. We also show that the adjacency matrix of a graph is indeed a linear shift invariant graph filter with respect to the defined shift operator. Inheriting the concepts of finite impulse response (FIR) and infinite impulse from classical signal processing, we introduce graph finite impulse response (GFIR) and graph infinite impulse response (GIIR) filters and obtain explicit forms for such filters. We further obtain the optimal filtering on graphs, i.e., the corresponding \emph{Wiener} filtering on graphs, and elaborate on the structure of such filters for any arbitrary graph structure. We specially treat the directed cyclic graph and show that the optimal linear shift invariant filter is indeed the \emph{Wiener} filter in classical signal processing. This result show that, optimal linear time invariant filters for time series data is a subset of optimal graph filters. We also elaborate on the best linear predictor graph filters and optimal filters for product graphs.
Investment patterns of MNCs in development areas of China and their impacts on regional development

ZHANG Xiao-ping,

地理研究 , 2005,
Abstract: Globalization force dominated by Multinational Corporations (MNCs) has increasingly been an important factor influencing regional development. In the last two decades, as a result of increasing globalization and fast technological advances, dynamics behind spatial organization of economic activities have been changing very rapidly and hence spatial arrangements of economic activities become more and more complicated. To actively participate in globalization via attracting foreign direct investment and technological transfers, the Chinese government has established various kinds of development areas since the opening up and reform in the late 1970s and provided tax holidays to foreign investors in the development areas as well as domestic investors in the high-tech sectors. By employing the cases of MNCs' investment in the development areas of China, local ties of global production networks (GPN) are analyzed and three patterns, namely, gradual pattern, embedded pattern and following pattern, are put forward. It indicates that the GPN of MNCs have been strengthened through their investments in the development areas of China. Accordingly, the development areas of China can be regarded as the local nodes of GPN. However, in the interest of local development, connections between GPN and local production networks have not been well developed, which should be gained more concern by local governments and administrators.
Characteristics and development mechanism of the economic and technological development areas in China

ZHANG Xiao-ping,

地理研究 , 2002,
Abstract: In recent years, growing attention has been devoted to the development areas in China. While most of the researches concern much to the development of research parks in China, the comprehensive researches about the Economic and Technological Development Areas (ETDAs) are very limited. Therefore, the main concern of this paper is first devoted to discussing the characteristics of ETDAs, and then based on the field investigations of main development areas in the coastal zone, the mechanism of development areas is explored. Since 1984, the Chinese central government has authorized 54 state-level ETDAs which are distributed within the whole country. Meanwhile the number of ETDAs planned by the provincial and local governments has increased so fast that the total number amounted to more than 500 by the end of 2000. From the spatial perspective, the developmental period of ETDAs can be divided into three stages: the first 14 ETDAs scattered in several cities along the coastal zone, and then they dispersed to the east and south regions of China; so far, the ETDAs have spread into the middle and western China. Most of the ETDAs has contributed a lot to the regional development, especially in terms of economic growth and use of foreign direct investment (FDI). Some of the ETDAs have become the most important growth poles in places where they are located. However, there are significant regional differences among the development areas. On the whole, the economic performance of development areas located in the coastal zone is better than that in the middle and western China. The main driving forces of the ETDAs' growth, as being argued in this paper, are the special policies for ETDAs, which can be regarded as the original force, the influence of the transnational corporations (TNCs), the market mechanism and the role of social and cultural factors. Moreover, in the long run, the regional learning and innovation ability is even more important for ETDAs' further development. Within China, however, the understanding of ETDAs still rests on the important role of special policies played in the development of the development areas. Accordingly, most regional governments, by increasing the number of ETDAs and providing preferential polices, have tended to accelerate regional economic growth, while ignoring the other driving forces that are in fact the endogenous powers for the development of the ETDAs.
Regional Disparities in Energy Consumption Intensity in China and Determining Factors

ZHANG Xiao-ping,

资源科学 , 2008,
Abstract: 能源消费强度反映国民经济发展中对能源的利用效率,其变动方向及影响因素受到学术界广泛关注。但研究中大多以我国总体能源消费强度的变化为对象,对地域差异关注不足。本文选取多项指标,构建能源消费规模份额指数、能耗强度指数、增长速度指数、综合消费指数,从不同角度刻画中国能源消费的区域差异。在此基础上,利用回归分析法,定量研究了地区能源消费强度的影响因素。结果表明,我国地区间能源消费强度的差异与地区总体经济发展水平、地区工业化程度、地区经济重型化程度存在直接关系,尤其是地区经济重型化程度的提高将会显著增加地区经济能耗强度。现阶段,控制高耗能重化工业的重复建设与盲目投资。对于减小能源消耗强度具有重要的意义。同时,经济发展水平和经济结构的地域差异性,要求我国能源战略的推进与实施必须制定相应的地区政策才能确保国家宏观战略的顺利实施。
Diaqua(5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane)nickel(II) tetracyanidonickelate(II)
Qian Zhang,Xiao-Ping Shen,Hu Zhou
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809033820
Abstract: In the title complex, [Ni(C16H36N4)(H2O)2][Ni(CN)4], the [Ni(teta)(H2O)2]2+ cations (teta = 5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane) and [Ni(CN)4]2 anions are arranged in an alternating fashion through electrostatic and N—H...N and O—H...N hydrogen-bonding interactions, forming a two-dimensional layered structure. Adjacent layers are linked through weak van der Waals interactions, resulting in a three-dimensional supramolecular network.
Yan Zhong,Xiao-Ping Zhang,Bin Wu
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812012767
Abstract: In the molecule of the title compound, C31H36N2O5, the piperazine ring displays a chair conformation. The dihedral angle between the benzene rings of the bis(4-methoxyphenyl)methyl group is 83.42 (15)°. In the crystal, centrosymmetrically related molecules are linked through pairs of C—H...O hydrogen bonds into dimers, generating an R22(10) ring motif. The dimers are further connected into chains parallel to [2-10] by C—H...O hydrogen bonds involving the methoxy groups.
The prevalence of Barrett’s esophagus remains low in Eastern China. Single-center 7-year descriptive study
Ming Zhang,Xiang-Shan Fan,Xiao-Ping Zou
Saudi Medical Journal , 2012,
Abstract: Objectives: To detect Barrett’s esophagus (BE) prevalence in patients undergoing gastroscopy in Eastern China. Methods: This study was carried out in Drum Tower Hospital Affiliated Medical College of Nanjing University, Nanjing, China from January 2005 to January 2012. All BE patients were enrolled in the study. The prevalence of BE were calculated generally in different age grades, calendar year, and by gender. The relationship between gastroesophageal reflux disease (GERD) symptoms and BE were also studied. Results: During the study period, 139,416 patients were studied and 234 patients (0.168%, 95% confidence interval, 0.146%-0.189%) were identified as BE. The mean age was 61.00±13.98 years, and the male to female ratio was 130:104. Most cases (173) were diagnosed due to endoscopic BE features; however, 61 were diagnosed of esophagitis, esophageal ulcer, esophagopolypus, and esophageal mucosa erosion. The prevalence increased with aging (χ2= 9.25, p<0.0001). Most BE were located in the lower segment of esophagus (92.7%) and short-segment BE. Gastroesophageal reflux disease symptoms were found in 131 patients (56%) and acid regurgitation was the most common symptom. Over a follow-up period, no BE developed to esophageal adenocarcinoma. Conclusions: The prevalence of BE in the studied population was very low. Approximately half of them show no signs of GERD symptoms.
Performance Limits and Geometric Properties of Narrowband Array Localization
Yanjun Han,Yuan Shen,Xiao-Ping Zhang,Huadong Meng
Mathematics , 2014,
Abstract: Location-aware networks are of great importance and interest in both civil and military applications. This paper determines the localization accuracy of an agent in a wireless network, where the agent is equipped with an antenna array making measurements with several anchor nodes in a far-field environment. In view of the Cram\'er-Rao bound, we derive that the localization information is a weighed sum of Fisher information matrices from each anchor-antenna measurement pair that employs narrowband transmission. Each matrix can be further decomposed into a distance part with intensity proportional to the squared baseband effective bandwidth, and a direction part with intensity associated with the normalized anchor-antenna visual angle. Moreover, we show that in the dynamic case, the Doppler shift contributes additional direction information, with intensity determined by the speed and the root mean squared time duration of the transmitted signal. Furthermore, two measures are proposed to evaluate the performance of wireless localization network with different anchor-agent and antenna-array geometries. Both formulae and simulations are provided to illustrate the superior anchor and/or antenna array geometries for achievable localization performances.
Noise Invalidation Denoising
Soosan Beheshti,Masoud Hashemi,Xiao-Ping Zhang,Nima Nikvand
Computer Science , 2010, DOI: 10.1109/TSP.2010.2074199
Abstract: A denoising technique based on noise invalidation is proposed. The adaptive approach derives a noise signature from the noise order statistics and utilizes the signature to denoise the data. The novelty of this approach is in presenting a general-purpose denoising in the sense that it does not need to employ any particular assumption on the structure of the noise-free signal, such as data smoothness or sparsity of the coefficients. An advantage of the method is in denoising the corrupted data in any complete basis transformation (orthogonal or non-orthogonal). Experimental results show that the proposed method, called Noise Invalidation Denoising (NIDe), outperforms existing denoising approaches in terms of Mean Square Error (MSE).
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