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Search Results: 1 - 10 of 28210 matches for " Ying Dai "
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Quality Assessment of Training Data with Uncertain Labels for Classification of Subjective Domains  [PDF]
Ying Dai
Journal of Computer and Communications (JCC) , 2017, DOI: 10.4236/jcc.2017.57014
Abstract: In order to improve the performance of classifiers in subjective domains, this paper defines a metric to measure the quality of the subjectively labelled training data (QoSTD) by means of K-means clustering. Then, the QoSTD is used as a weight of the predicted class scores to adjust the likelihoods of instances. Moreover, two measurements are defined to assess the performance of the classifiers trained by the subjective labelled data. The binary classifiers of Traditional Chinese Medicine (TCM) Zhengs are trained and retrained by the real-world data set, utilizing the support vector machine (SVM) and the discrimination analysis (DA) models, so as to verify the effectiveness of the proposed method. The experimental results show that the consistency of likelihoods of instances with the corresponding observations is increased notable for the classes, especially in the cases with the relatively low QoSTD training data set. The experimental results also indicate the solution how to eliminate the miss-labelled instances from the training data set to re-train the classifiers in the subjective domains.
Representing Images' Meanings by Associative Values with Given Lexicons Considering the Semantic Tolerance Relation
Ying Dai
Advances in Multimedia , 2011, DOI: 10.1155/2011/786427
Abstract: An approach of representing meanings of images based on associative values with lexicons is proposed. For this, the semantic tolerance relation model (STRM) that reflects the tolerance degree between defined lexicons is generated, and two factors of semantic relevance (SR) and visual similarity (VS) are involved in generating associative values. Furthermore, the algorithm of calculating associative values using pixel-based bidirectional associative memories (BAMs) in combination with the STRM, which is easy in implementation, is depicted. The experiment results of multilexicons-based retrieval by individuals show the effectiveness and efficiency of our proposed method in finding the expected images and the improvement in retrieving accuracy because of incorporating SR with VS in representing meanings of images. 1. Introduction With the technological advances in digital imaging, networking, and data storage, more and more people communicate with one another and express themselves by sharing images, videos, and other forms of media on line. However, it is difficult to fully utilize the semantic messages that the image/video carries, because the nature of the concepts regarding images in many domains are imprecise, and the interpretation of finding similar images/videos is also ambiguous and subjective on the level of human perception. Accordingly, there are some techniques that focus on annotating the images by folksonomy (Flickr, del.icio.us). But the deliberately idiosyncratic annotation induced by folksonomies has a risk to decrease the systems’ performance in formation retrieval utility. In Xie et al. [1], by examining the effects of different choices of lexicons and input detectors, such a conclusion is reached that more concepts than necessary can hurt performance. Thus, much research aims to the image/video automatic annotation or presentation based on the semantic messages that the images carry. In order to avoid the expense and limitations of text annotations on images, there is considerable interest in efficient database access by perceptual and other automatically extractable attributes of images. However, most current retrieval systems only rely on low-level image features such as color and texture, whereas human users think in terms of concepts [2–5]. Usually relevance feedback is the only attempt to close the semantic gap between user and system. Recently, there is much research to reduce the semantic gap between users and retrieval systems with the different levels of abstraction employed by human and machine. In Rogowitz [6], how human
Study on group intervention regarding interpersonal trust among college students with campus psychodrama  [PDF]
Ying Ge, Huamin He, Linna Dai
Health (Health) , 2011, DOI: 10.4236/health.2011.37076
Abstract: Purpose: To explore the interventional effects of campus psychodrama on improving the interpersonal trust among college students. Methods: 16 college students with low levels of interpersonal trust were selected to conduct 5 sessions of psychodrama therapy. Results: The subject group has gone through stages of ice breaking, performance, and sharing. Through group counseling with psychodrama, the social avoidance and distressful behaviors of the subjects have been alleviated, and their levels of interpersonal trust demonstrated notable change. Conclusion: Campus psychodrama is an effective group counseling approach for improving college students’ interpersonal trust.
Research on Extraction Process of Gallic Acid from Penthorum chinense Pursh by Aqueous Ethanol  [PDF]
Luping Kang, Shanbin Yang, Yan Peng, Jiao Dai, Xingchun Ying
Green and Sustainable Chemistry (GSC) , 2015, DOI: 10.4236/gsc.2015.52009
Abstract: Penthorum chinense Pursh is rich in gallic acid, which has antioxidant, anti-inflammatory, anti-fungal and antitumor activities. In order to optimize their extraction conditions, various extraction parameters were chosen to identify their effects on gallic acid extraction. With extraction amount of gallic acid as index, based on single factor analysis, influence of solid/liquid ratio, ethanol concentration, fetch time and extraction temperature on extraction technology were investigated by orthogonal test. The optimization conditions for gallic acid extraction were determined as follows: ethanol concentration 60%, extraction time 2.5 h, temperature 90°C and solid/liquid ratio 1:30. The corresponding gallic acid content was 4.85%. This optimized extraction process was stable and feasible.
Do Somatic Mitochondrial DNA Mutations Contribute to Parkinson's Disease?
Joanne Clark,Ying Dai,David K. Simon
Parkinson's Disease , 2011, DOI: 10.4061/2011/659694
Abstract: A great deal of evidence supports a role for mitochondrial dysfunction in the pathogenesis of Parkinson's disease (PD), although the origin of the mitochondrial dysfunction in PD remains unclear. Expression of mitochondrial DNA (mtDNA) from PD patients in “cybrid” cell lines recapitulates the mitochondrial defect, implicating a role for mtDNA mutations, but the specific mutations responsible for the mitochondrial dysfunction in PD have been difficult to identify. Somatic mtDNA point mutations and deletions accumulate with age and reach high levels in substantia nigra (SN) neurons. Mutations in mitochondrial DNA polymerase γ (POLG) that lead to the accumulation of mtDNA mutations are associated with a premature aging phenotype in “mutator” mice, although overt parkinsonism has not been reported in these mice, and with parkinsonism in humans. Together these data support, but do not yet prove, the hypothesis that the accumulation of somatic mtDNA mutations in SN neurons contribute to the pathogenesis of PD. 1. Evidence for Mitochondrial Dysfunction in PD A large body of evidence suggests that mitochondrial dysfunction is a common pathological mechanism of neurodegenerative diseases including PD. There is a significant decrease in complex I activity of the mitochondrial electron transport chain and reduced immunohistochemical staining for complex I subunits in the substantia nigra (SN) from PD patients [1–4]. A recent meta-analysis of genome-wide expression data from SN neurons of patients with symptomatic and subclinical PD identified defects in mitochondrial electron transport, glucose utilization and sensing [5]. One key set of genes found in this study to be underexpressed in the brains of PD patients is under the control of the transcriptional coactivator peroxisome proliferator-activated receptor gamma coactivator 1-alpha (PGC-1α), a master regulator of mitochondrial biogenesis. Moreover, functional imaging like PET and functional magnetic resonance imaging (fMRI) show glucose metabolic defect in the frontal cortex in PD patients [6, 7]. Together, these and other data provide clear evidence for a defect in mitochondrial metabolism in PD. 2. Mitochondrial Dysfunction: Chicken or Egg? Although evidence for defective mitochondrial energy metabolism in PD is strong, such a defect theoretically could be a consequence or marker of neurodegeneration rather than a contributor to the pathogenesis of PD. The most compelling evidence supporting a pathogenic role for mitochondrial dysfunction in PD comes from accidental human exposures to
A new electrical contact alloy with high reliability based on gold
Yuantao Ning,Ying Peng,Hong Dai
Gold Bulletin , 2002, DOI: 10.1007/BF03214842
Abstract: A new gold alloy (NSCGA) was designed and prepared for light duty precision contacts. The microstructure, mechanical, electrical and applied properties of the NSCGA alloy were studied. The NSCGA alloy contains copper, palladium, platinum, nickel and rhodium as well as gold. The unique structure comprised of two phases, a gold-rich solid solution as the matrix and a platinum-rich solid solution as a strengthening phase. The matrix presents short-range ordering in the temperature range 200-900°C, which leads to the specific resistance of the alloy decreasing, and a modulated structure at low temperatures, which is responsible for age strengthening. The NSCGA alloy has low specific resistance, high tensile strength and high Vickers hardness. Various TO-5 type relays (TO-5 relay is a sealed mini relay with magnetic preservation) with NSCGA alloy as contacts were prepared and tested in a special relay factory under industrial conditions. NSCGA alloy contacts showed stable and low contact resistance, long loading life and high reliability, superior to that of an available conventional sixcomponent palladium alloy. The NSCGA alloy and the composites with NSCGA alloy as a covering layer and copper alloys as a base have been evaluated in various TO-5 type mini relays and other electric products.
Formation of ζ phase in Cu-Ge peritectic alloys
Ying Ruan,FuPing Dai,BingBo Wei
Chinese Science Bulletin , 2007, DOI: 10.1007/s11434-007-0371-1
Abstract: Rapid growth behavior of ζ phase has been investigated in the undercooling experiments of Cu-14%Ge, Cu-15%Ge, Cu-18.5%Ge and Cu-22%Ge alloys. Alloys of the four compositions obtain the maximum undercoolings of 202 K(0.17T L), 245 K(0.20T L), 223 K(0.20T L) and 176 K(0.17T L), respectively. As the content of Ge increases, the microstructural transition of “α(Cu) dendrite + ζ peritectic phase → ζ peritectic phase → ζ dendrite + ( +ζ) eutectic” takes place in the alloy at small undercooling, while the microstructural transition of “fragmented α(Cu) dendrite + ζ peritectic phase → ζ peritectic phase → ζ dendrite + phase” happens in the alloy at large undercooling. EDS analysis of the Ge content in ζ peritectic phase indicates that undercooling enlarges the solid solubility of α dendrite, which leads to a decrease in the Ge content in ζ phase as undercooling increases. In the Cu-18.5%Ge alloy composed of ζ peritectic phase, the Ge content in ζ phase increases when undercooling increases, which is due to the restraint of the Ge enrichment on the grain boundaries by high undercooling effect.
Decadal-scale variability of warm season temperature in Beijing over the past 2650 years
Ying Dai,Yan Zhang,JunYi Ge
Chinese Science Bulletin , 2011, DOI: 10.1007/s11434-011-4574-0
Abstract: A continuous record of surface temperature for the past 2650 years was obtained in an earlier study from a Beijing stalagmite based on sedimentary layer counting and thickness measurements. Singular spectrum analysis, multi-taper and wavelet spectral analyses are used in this study to identify decadal-scale signals and their origins in this record. Besides long-term cycles of solar origin identified in earlier studies, this record contains cycles that dominate temperature with periods of 102–70, 66–50, 31, 25–22, 19, 15, 12 and 9 years. The 102–70, 25–22, 12 and 9 year cycles are attributable to solar variation, while the others are likely to be related to low-latitude ocean forcing. These results suggest that century-scale changes in the Beijing summer temperature over the past 2650 years are primarily controlled by solar variation, while ocean-atmospheric interactions play a prominent role in modulating decadal-scale variability.
A New Solution of the Yang-Baxter Equation Related to the Adjoint Representation of $U_{q}B_{2}$
Zhong-Qi Ma,An-Ying Dai
Physics , 1993, DOI: 10.1088/0305-4470/27/6/023
Abstract: A new solution of the Yang-Baxter equation, that is related to the adjoint representation of the quantum enveloping algebra $U_{q}B_{2}$, is obtained by fusion formulas from a non-standard solution.
Quantum Three-Body Problem
Zhong-Qi Ma,An-Ying Dai
Physics , 1999, DOI: 10.1007/BF02898245
Abstract: An improved hyperspherical harmonic method for the quantum three-body problem is presented to separate three rotational degrees of freedom completely from the internal ones. In this method, the Schr\"{o}dinger equation of three-body problem is reduced to a system of linear algebraic equations in terms of the orthogonal bases of functions. As an important example in quantum mechanics, the energies and the eigenfunctions of some states of the helium atom and the helium-like ions are calculated.
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