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Search Results: 1 - 10 of 28425 matches for " Sun Mengyun "
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Aplica o de Técnicas de Análise Multivariada para Avaliar as Classifica es de Risco dos Países Fornecidas pelas Agências de Crédito
Luiz Egydio Malamudi Rossi,Sun Mengyun
Revista de Finan?as Aplicadas , 2010,
Abstract: Objetivou-se, neste trabalho, verificar se a classifica o de risco dos países da empresa Standard & Poors pode ser explicada por quatro técnicas de análise de dados multivariadas, mais especificamente, as análises fatorial, de conglomerados e discriminante, e pela regress o logística. Analisaram-se 51 variáveis macroecon micas quantitativas de 85 países utilizadas pela própria Standard & Poors entre os anos de 2002 e 2006, principalmente, para verificar a capacidade de discrimina o entre os detentores e os destituídos do grau de investimento. A análise discriminante e a regress o logística foram utilizadas para identificar as variáveis capazes de discriminar os países em termos de risco. Testou-se o poder explicativo das variáveis e concluiu-se que a técnica explica as classifica es da agência de credito. Verificou-se que se pode, com apenas duas variáveis quantitativas relacionadas ao produto do país e ao endividamento externo, estimar se o país é considerado como grau de investimento. Destaca-se que as variáveis quantitativas analisadas foram suficientes para explicar, com 95,3% de confian a, a classifica o do grau de investimento dos países.
What Makes it Difficult to Understand a Scientific Literature?
Mengyun Cao,Jiao Tian,Dezhi Cheng,Jin Liu,Xiaoping Sun
Computer Science , 2015,
Abstract: In the artificial intelligence area, one of the ultimate goals is to make computers understand human language and offer assistance. In order to achieve this ideal, researchers of computer science have put forward a lot of models and algorithms attempting at enabling the machine to analyze and process human natural language on different levels of semantics. Although recent progress in this field offers much hope, we still have to ask whether current research can provide assistance that people really desire in reading and comprehension. To this end, we conducted a reading comprehension test on two scientific papers which are written in different styles. We use the semantic link models to analyze the understanding obstacles that people will face in the process of reading and figure out what makes it difficult for human to understand a scientific literature. Through such analysis, we summarized some characteristics and problems which are reflected by people with different levels of knowledge on the comprehension of difficult science and technology literature, which can be modeled in semantic link network. We believe that these characteristics and problems will help us re-examine the existing machine models and are helpful in the designing of new one.
Obstacles of Organizational Learning and Self-transcendence: Theoretical Research Based on Chinese Family Business
Mengyun Wu,Chuanming Chen
Asian Social Science , 2012, DOI: 10.5539/ass.v8n13p89
Abstract: Family enterprises widely exist in countries of the world. No matter in quantity or in scale, family enterprise takes a great share of world economy and occupies a very important position in national economy. Nowadays, research on family enterprise turns to be the focus of theoretic research in all countries, and organizational learning is also thought to be the key issue of family enterprises to survive, develop and maintain competitive advantages. However, the obstacles in learning are difficult questions and may weaken family enterprises’ core competence. Thus, the article starts with the basic meaning of obstacles in organizational learning, analyzes their influence factors from several aspects (learning process, organization’s ideas and culture), and puts forward the countermeasures for enhancing organizational learning ability of family enterprises.
Theoretical Research on Professional Management, Trust Mechanism and Firm Growth of Chinese Private High-tech SMEs
Mengyun Wu,Jie Lu
Asian Social Science , 2012, DOI: 10.5539/ass.v8n15p165
Abstract: With the development of market economy and the fast-growing economic globalization, the limitations in management model of China’s private high-tech SMEs gradually emerge as constraints for the development of family businesses. In which, financing, capital integrating, especially the integrating of human capital are important issues to emphasize family-owned enterprises. Therefore, how to efficiently introduce professional manager’s mechanisms of private high-tech SMEs and how to resolve the trust vacancy will be two of the major problems for private high-tech SMEs. The article introduces characteristics of private high-tech SMEs, discusses the deficiencies of professional management mechanism of family-owned enterprises, the problems of trust vacancy in the management, and puts forward corresponding countermeasures to effectively integrate among professional management, trust mechanism and private hi-tech SMEs’ growth.
Research on Governance Behavior and Inheritance Performance: A Review Based on Chinese Family Businesses
Mengyun Wu,Lei Pan
Asian Social Science , 2012, DOI: 10.5539/ass.v8n12p148
Abstract: Governance behavior is a symbol of institutions and mechanisms which is used for standardizing variable relationships between families and businesses. The family businesses’ effective inheritance and sustainable development have unavoidably become two of the biggest challenges for family businesses and owners in the fortune-accumulating process. The paper explains the contents of two types of governance, both relational governance and contractual governance of family business, as well as inheritance performance, discusses the complicated dimension and structure of enterprises’ performance, such as family business’ performance, family success and the working attitudes of staff members. The paper also discusses the relationship between contractual governance and family businesses’ inheritance, and the relationship between relational governance and family businesses’ inheritance.
Potentially Functional Variants of PLCE1 Identified by GWASs Contribute to Gastric Adenocarcinoma Susceptibility in an Eastern Chinese Population
Mengyun Wang, Ruoxin Zhang, Jing He, Lixin Qiu, Jin Li, Yanong Wang, Menghong Sun, Yajun Yang, Jiucun Wang, Jingmin Yang, Ji Qian, Li Jin, Hongxia Ma, Qingyi Wei, Xiaoyan Zhou
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0031932
Abstract: Background Recent genome-wide association studies (GWAS) have found a single nucleotide polymorphism (SNP, rs2274223 A>G) in PLCE1 to be associated with risk of gastric adenocarcinoma. In the present study, we validated this finding and also explored the risk associated with another unreported potentially functional SNP (rs11187870 G>C) of PLCE1 in a hospital-based case-control study of 1059 patients with pathologically confirmed gastric adenocarcinoma and 1240 frequency-matched healthy controls. Methodology/Principal Findings We determined genotypes of these two SNPs by the Taqman assay and used logistic regression models to estimate odds ratios (ORs) and 95% confidence intervals (95% CI). We found that a significant higher gastric adenocarcinoma risk was associated with rs2274223 variant G allele (adjusted OR = 1.35, 95% CI = 1.14–1.60 for AG+GG vs. AA) and rs11187870 variant C allele (adjusted OR = 1.26, 95% CI = 1.05–1.50 for CG+CC vs. GG). We also found that the number of combined risk alleles (i.e., rs2274223G and rs11187870C) was associated with risk of gastric adenocarcinoma in an allele-dose effect manner (Ptrend = 0.0002). Stratification analysis indicated that the combined effect of rs2274223G and rs11187870C variant alleles was more evident in subgroups of males, non-smokers, non-drinkers and patients with gastric cardia adenocarcinoma. Further real-time PCR results showed that expression levels of PLCE1 mRNA were significantly lower in tumors than in adjacent noncancerous tissues (0.019±0.002 vs. 0.008±0.001, P<0.05). Conclusions/Significances Our results further confirmed that genetic variations in PLCE1 may contribute to gastric adenocarcinoma risk in an eastern Chinese population.
Polymorphisms in the ERCC5 Gene and Risk of Esophageal Squamous Cell Carcinoma (ESCC) in Eastern Chinese Populations
Mei-Ling Zhu, Ting-Yan Shi, Hai-Chuan Hu, Jing He, Mengyun Wang, Li Jin, Ya-Jun Yang, Jiu-Cun Wang, Meng-Hong Sun, Huan Chen, Kuai-Le Zhao, Zhen Zhang, Hai-Quan Chen, Jia-Qing Xiang, Qing-Yi Wei
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0041500
Abstract: Background Excision repair cross complementing group 5 (ERCC5 or XPG) plays an important role in regulating DNA excision repair; its functional single nucleotide polymorphisms (SNPs) may alter DNA repair capacity and thus contribute to cancer risk. Methodology/Principal Findings In a hospital-based case-control study of 1115 esophageal squamous cell carcinoma (ESCC) cases and 1117 cancer-free controls, we genotyped three potentially functional SNPs of ERCC5 (SNPs, rs2296147T>C, rs2094258C>T and rs873601G>A) and estimated crude and adjusted odds ratios (ORs) and 95% confidence intervals (CIs) for their associations with risk of ESCC using unconditional logistic regression models. We also calculated false-positive report probabilities (FPRPs) for significant findings. We found that compared with the TT genotype, ERCC5 rs2296147 C variant genotypes were associated with a significantly lower ESCC risk (CT: adjusted OR = 0.76, 95% CI = 0.63–0.93, CT/CC: adjusted OR = 0.80, 95% CI = 0.67–0.96); however, this risk was not observed for the other two SNPs (rs2094258C>T and rs873601 G>A), nor in further stratification and haplotype analysis. Conclusions/Significances These findings suggested that ERCC5 polymorphisms may contribute to risk of ESCC in Eastern Chinese populations, but the effect was weak and needs further validation by larger population-based case-control studies.
An ERP Assessment of Hemispheric Projections in Foveal and Extrafoveal Word Recognition
Timothy R. Jordan, Giorgio Fuggetta, Kevin B. Paterson, Stoyan Kurtev, Mengyun Xu
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0023957
Abstract: Background The existence and function of unilateral hemispheric projections within foveal vision may substantially affect foveal word recognition. The purpose of this research was to reveal these projections and determine their functionality. Methodology Single words (and pseudowords) were presented to the left or right of fixation, entirely within either foveal or extrafoveal vision. To maximize the likelihood of unilateral projections for foveal displays, stimuli in foveal vision were presented away from the midline. The processing of stimuli in each location was assessed by combining behavioural measures (reaction times, accuracy) with on-line monitoring of hemispheric activity using event-related potentials recorded over each hemisphere, and carefully-controlled presentation procedures using an eye-tracker linked to a fixation-contingent display. Principal Findings Event-related potentials 100–150 ms and 150–200 ms after stimulus onset indicated that stimuli in extrafoveal and foveal locations were projected unilaterally to the hemisphere contralateral to the presentation hemifield with no concurrent projection to the ipsilateral hemisphere. These effects were similar for words and pseudowords, suggesting this early division occurred before word recognition. Indeed, event-related potentials revealed differences between words and pseudowords 300–350 ms after stimulus onset, for foveal and extrafoveal locations, indicating that word recognition had now occurred. However, these later event-related potentials also revealed that the hemispheric division observed previously was no longer present for foveal locations but remained for extrafoveal locations. These findings closely matched the behavioural finding that foveal locations produced similar performance each side of fixation but extrafoveal locations produced left-right asymmetries. Conclusions These findings indicate that an initial division in unilateral hemispheric projections occurs in foveal vision away from the midline but is not apparent, or functional, when foveal word recognition actually occurs. In contrast, the division in unilateral hemispheric projections that occurs in extrafoveal locations is still apparent, and is functional, when extrafoveal word recognition takes place.
A parametrization of the cosmic-ray muon flux at sea-level
Mengyun Guan,Ming-Chung Chu,Jun Cao,Kam-Biu Luk,Changgen Yang
Physics , 2015,
Abstract: Based on the standard Gaisser's formula, a modified parametrization for the sea-level cosmic-ray muon flux is introduced. The modification is verified against experimental results. The average vertical cosmic-ray muon intensity as a function of depth of standard rock is simulated using the modified formula as input to the MUSIC code. The calculated muon intensities is consistent with the experimental measurements.
Formal Derivation of the Combinatorics Problems with PAR Method  [PDF]
Lingyu SUN, Yatian SUN
Journal of Software Engineering and Applications (JSEA) , 2009, DOI: 10.4236/jsea.2009.23026
Abstract: Partition-and-Recur (PAR) method is a simple and useful formal method. It can be used to design and testify algo-rithmic programs. In this paper, we propose that PAR method is an effective formal method on solving combinatorics problems. Furthermore, we formally derive combinatorics problems by PAR method, which cannot only simplify the process of algorithmic program's designing, but also improve its automatization, standardization and correctness. We develop algorithms for two typical combinatorics problems, the number of string scheme and the number of error per-mutation scheme. Lastly, we obtain accurate C++ programs which are transformed by automatic transforming system of PAR platform.
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