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Search Results: 1 - 10 of 27919 matches for " Sheng Ding "
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Intelligent Optimization Methods for High-Dimensional Data Classification for Support Vector Machines  [PDF]
Sheng Ding, Li Chen
Intelligent Information Management (IIM) , 2010, DOI: 10.4236/iim.2010.26043
Abstract: Support vector machine (SVM) is a popular pattern classification method with many application areas. SVM shows its outstanding performance in high-dimensional data classification. In the process of classification, SVM kernel parameter setting during the SVM training procedure, along with the feature selection significantly influences the classification accuracy. This paper proposes two novel intelligent optimization methods, which simultaneously determines the parameter values while discovering a subset of features to increase SVM classification accuracy. The study focuses on two evolutionary computing approaches to optimize the parameters of SVM: particle swarm optimization (PSO) and genetic algorithm (GA). And we combine above the two intelligent optimization methods with SVM to choose appropriate subset features and SVM parameters, which are termed GA-FSSVM (Genetic Algorithm-Feature Selection Support Vector Machines) and PSO-FSSVM(Particle Swarm Optimization-Feature Selection Support Vector Machines) models. Experimental results demonstrate that the classification accuracy by our proposed methods outperforms traditional grid search approach and many other approaches. Moreover, the result indicates that PSO-FSSVM can obtain higher classification accuracy than GA-FSSVM classification for hyperspectral data.
Spectral and Wavelet-based Feature Selection with Particle Swarm Optimization for Hyperspectral Classification
Sheng Ding
Journal of Software , 2011, DOI: 10.4304/jsw.6.7.1248-1256
Abstract: Spectral band selection is a fundamental problem in hyperspectral classification. This paper addresses the problem of band selection for hyperspectral remote sensing image and SVM parameter optimization. First, we propose an evolutionary classification system based on particle swarm optimization (PSO) to improve the generalization performance of the SVM classifier. For this purpose, we have optimized the SVM classifier design by searching for the best value of the parameters that tune its discriminant function, and upstream by looking for the best subset of features that feed the classifier. Second, for making use of wavelet signal feature of pixels of hyperspectral image,we investigate the performance of the selected wavelet features based on wavelet approximate coefficients at the third level.The PSO algorithm is performed to optimize spectral feature and wavelet-based approximate coefficients to select the best discriminant features for hyperspectral remote imagery.The experiments are conducted on the basis of AVIRIS 92AV3C dataset. The obtained results clearly confirm the superiority of the SVM approach as compared to traditional classifiers, and suggest that further substantial improvements in terms of classification accuracy can be achieved by the proposed PSO-SVM classification system.
Exploring Influences of Teachers’ Social Behaviors on Students’ Social Skills in Physical Education Classes: An Example with Chinese College Freshmen  [PDF]
Ningning Sheng, Jiandong Ding, Yoshio Sugiyama
Advances in Physical Education (APE) , 2018, DOI: 10.4236/ape.2018.81005
Abstract: This studyexplored the influences of physical education (PE) teachers’ social behaviors on students’social skills in PE classes through investigating a sample of Chinese college freshmen.First, we developed a scale to determine teachers’ social behaviors enacted while teaching PE. Items of the scale were selected from the pre-version of Teacher’s Social Skills Self-report Scale and changed from a teacher self-report to a student-evaluation style based on the specificity of PE context and the native culture of China.Students (n?= 366, 194male, 172 female, mean age = 18.6 years) from two universities in China completed a survey using a questionnaire contains the selected items. Through performing factorandreliabilityanalyses, the scale was demonstrated to have acceptable internal consistency reliability and good content validity for measuring college students’ evaluations of their PE teachers’ social behaviors in PE classes toward two sub-domains named expressivity and control. Then, the developed scale and the 11 Item of Social Skills Inventory were administeredto a sample of freshmen (n?= 302,157male, 145 female,mean age = 17.7 years) to examine
Generation of RNAi Libraries for High-Throughput Screens
Julie Clark,Sheng Ding
Journal of Biomedicine and Biotechnology , 2006, DOI: 10.1155/jbb/2006/45716
Abstract: The completion of the genome sequencing for several organisms has created a great demand for genomic tools that can systematically analyze the growing wealth of data. In contrast to the classical reverse genetics approach of creating specific knockout cell lines or animals that is time-consuming and expensive, RNA-mediated interference (RNAi) has emerged as a fast, simple, and cost-effective technique for gene knockdown in large scale. Since its discovery as a gene silencing response to double-stranded RNA (dsRNA) with homology to endogenous genes in Caenorhabditis elegans (C elegans), RNAi technology has been adapted to various high-throughput screens (HTS) for genome-wide loss-of-function (LOF) analysis. Biochemical insights into the endogenous mechanism of RNAi have led to advances in RNAi methodology including RNAi molecule synthesis, delivery, and sequence design. In this article, we will briefly review these various RNAi library designs and discuss the benefits and drawbacks of each library strategy.
Induced pluripotent stem cells free of exogenous reprogramming factors
Ramzey Abujarour, Sheng Ding
Genome Biology , 2009, DOI: 10.1186/gb-2009-10-5-220
Abstract: The epigenome of differentiated somatic cells can be reprogrammed to a pluripotent state by nuclear transfer into enucleated oocytes or by fusion with pluripotent cells such as embryonic stem cells (ESCs) [1]. More recently, it has been shown that overexpression of defined transcription factors via transduction of viral vectors can reprogram mouse and human somatic cells to induced pluripotent stem cells (iPSCs) [2-4]. This new approach greatly simplifies the generation of pluripotent cells, bypassing many technical and ethical hurdles, and brings closer the possibility of using patient-specific cells in cell-based therapy. However, the use of viruses to deliver the reprogramming factors entails permanent genetic alterations that render the cells inappropriate for many in vitro and in vivo applications. Several approaches have recently been devised to generate iPSCs free of the exogenous reprogramming factor genes, including the use of non-integrating approaches for transgene delivery [5,6]. Four papers published this year describe a variety of novel approaches. Soldner et al. [7] have used the Cre/loxP recombination system to produce human iPSCs free of exogenous reprogramming genes. Woltjen et al. [8] and Kaji et al. [9] demonstrate that the piggyBac (PB) transposon system can be used both to introduce reprogramming genes and induce pluripotency and then to remove the transgenes from established iPSC lines. Finally, Yu et al. [10] describe the successful use of another type of non-integrating vector to obtain iPSCs free of vector and transgenes.ESCs are derived from the inner cell mass of mammalian embryos, and are characterized by their capacity to self-renew indefinitely in culture and their potential to differentiate into all cell types of the body. During development, cells become more restricted in their ability to generate other cell types and somatic cells do not normally revert to an earlier, more primitive developmental stage. Nonetheless, the development
Multiplicative properties of a quantum Caldero-Chapoton map associated to valued quivers
Ming Ding,Jie Sheng
Mathematics , 2011,
Abstract: We prove a multiplication theorem of a quantum Caldero-Chapoton map associated to valued quivers which extends the results in \cite{DX}\cite{D}. As an application, when $Q$ is a valued quiver of finite type or rank 2, we obtain that the algebra $\mathcal{AH}_{|k|}(Q)$ generated by all cluster characters (see Definition \ref{def}) is exactly the quantum cluster algebra $\mathcal{EH}_{|k|}(Q)$ and various bases of the quantum cluster algebras of rank 2 can naturally be deduced.
Meir-Keeler type contractions in partially ordered G-metric spaces
Hui-Sheng Ding and Erdal Karap nar
Fixed Point Theory and Applications , 2013, DOI: 10.1186/1687-1812-2013-35
Abstract: MSC: 46N40, 47H10, 54H25, 46T99.
Experimental evidence for aerobic bio-denitrification
Aizhong Ding,Jiamo Fu,Guoying Sheng
Chinese Science Bulletin , 2000, DOI: 10.1007/BF02893791
Abstract: Nitrate pollution of groundwater is paid more and more attention for its hazardous to environments and human health. A strain of DN11 was isolated from soil and used in the laboratory columns filled with various media for nitrate removal. The experimental results showed that DN11 could reduce nitrate at different rates in different media under the aerobic condition. The mechanism for nitrate removal with DN11 is explained meanwhile.

DING Sheng Yan,

生态学报 , 1999,
Abstract: The general situation of evergreen broad leaved forest seral of Tiantong National Forest Park in Zhejiang Province was studied.The photosynthesis physi ecology of regenerative ability of nursery stocks and the replacement of adults were revealed.The results show that:(1)The regenerative ability of nursery stock of dominants are not only related with their own bio ecological characteristics,the seed sources and the habitats,but also related with their compensate point of light.(2)The position change of these dominants and replacement with each other along with the EBLF succession is related with the assimilation rate.
A comparation of respiration characteristics between Schima superba and Castanopsis fargesii in successional series of evergreen broad leaved forest

DING Sheng Yan,

生态学报 , 2001,
Abstract: The respiratory rate of different developping stages of Schima superba and Castanopsis fargesii in successional series of evergreen broad leaved forest was studied and the respiratory rates of different developping stages of S.superba and C.fargesii in the same successional stage were compared.The results show that in every successional stage,the respiratory rate of C.fargesii is higher than that of S.superba. In the early successional stage with stronger light intensity,the respira...
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