The review text received by crowdsourcing participants contains valuable knowledge, opinions, and preferences, which is an important basis for employers to make trading decisions, improve service level quality. However, there are two kinds of emotional polarity in the text, attention paid sentiment classification with fuzzy boundaries insufficient. This paper proposes a supervised method Latent Dirichlet Allocation (LDA) performance boundaries. Taking on Zhubajie platform as data set, using...

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This study adopted the Latent Dirichlet Allocation (LDA) to extract learners' needs based on 70,145 reviews from online course designed for software design and development in China then applied Quality Function Deployment (QFD) map differentiated into quality attributes. Taking national first-class courses as benchmarking object identify key attributes expected massive open (MOOCs), findings reveal that video, exercise, teaching schedule, presentation of material are pivotal factors...

ABSTRACT Using data from 161 Chinese cities, this paper investigates the effects of various dimensions urban spatial structure on ownership and commute mode split automobile. Results confirm positive city size auto negative effect density ownership. Echoing a small number studies, research discovers seemingly counterintuitive jobs‐housing balance use automobiles, probably due to potential advantage public transit relative driving in dense congested cities. Cities should emphasize maintain future.

Objective We sought to evaluate the prognostic ability of blood urea nitrogen serum albumin ratio (BAR) for acute kidney injury (AKI) and in-hospital mortality in patients with intracerebral haemorrhage (ICH) intensive care unit (ICU). Design A retrospective cohort study using propensity score matching. Setting ICU Beth Israel Deaconess Medical Center. Participants The data ICH were obtained from Information Mart Intensive Care IV (V.1.0) database. total 1510 enrolled our study. Main outcome...

Abstract Acute kidney injury (AKI), a serious complication in critically ill patients, is associated with poor clinical outcomes. We explored the hypothesis that β2-microglobulin (β2-MG) an independent indicator of AKI development and outcomes patients intracerebral hemorrhage (ICH) neurosurgical intensive care unit (NICU). Patients ICH (n = 403) admitted to NICU Zhongnan Hospital, Wuhan University, between January 1, 2015 December 31, 2016 were prospectively enrolled this single-center,...

Abstract A Quantitative Structure–Property Relationship (QSPR) model was developed to predict the flash points of organic compounds. The widely used group contribution method employed, and a new collection 57 functional groups were selected as molecular descriptors. chemometrics Support Vector Machine (SVM) employed for fitting possible quantitative relationship that existed between these points. total 1282 compounds various chemical families randomly divided into training set (1026) an...

A quantitative structure−property relationship (QSPR) study is performed to develop mathematical models for prediction of the upper flammability limits (UFL) organic compounds from their molecular structures. The structural features are numerically represented by various kinds calculated descriptors such as topological, charge, and geometric descriptors. genetic algorithm combined with multiple linear regression (GA-MLR) used select an optimal subset that have significant contribution...

The uptake and metabolism profiles of ginsenoside Rh2 its aglycon protopanaxadiol (ppd) were studied in the human epithelial Caco-2 cell line. High-performance liquid chromatography-mass spectrometry was applied to determine ppd concentration cells at different pH, temperature, levels presence or absence inhibitors. time dependent, rates reduced by metabolic inhibitors influenced low thus indicating that absorption process energy-dependent. Drug maximal when extracellular pH 7.0 for 8.0 ppd....

The air pollution problem in China continues to become more severe with dramatic economic development. focus of this study was create a map representing the spatial–temporal pattern quality three major zones China, including Beijing–Tianjin–Hebei Economic Zone, Yangtze River Delta and Pearl Zone 2014. A calendar view used visualize daily condition primary pollutant each city 2014, geographic references were added visualization according their spatial relationships. provides an efficient way...

This study develops a framework for measuring the capability, pressure, and resistance to enforce environmental regulations then applies this three-dimensional enforcement air quality in urban China. Based on daily Air Pollution Index data published by China's Ministry of Environmental Protection during 2001-2011, paper reports an overall improvement quality, but significant inter-city variations. Statistical results indicate that low capability strong stringent have contributed degradation...

ABSTRACT A quantitative structure–property relationship (QSPR) study is performed to develop mathematical models for the prediction of flash point (FP) organosilicon compounds from their molecular structures. Various kinds descriptors were calculated represent structures compounds, such as topological, charge, and geometric descriptors. The genetic algorithm combined with multiple linear regression (GA‐MLR) employed a select optimal subset that have significant contribution overall FP...

A quantitative structure-property relationship (QSPR) model was proposed for predicting electric spark sensitivity of 39 nitro arenes. The genetic function approximation (GFA) employed to select the descriptors that have significant contribution from various and fitting existed between selected 8 sensitivity. correlation coefficients ( R 2 ) together with coefficient leave-one-out cross validation Q CV are 0.924 0.873, respectively. is highly statistically significant, robustness as well...

A high-definition digital color image watermark algorithm based on QR code and DWT is studied in this paper. The basic concept, theoretical framework the application domain of introduced. From simulation results, can achieve better universality, be applied to most images. Watermarked works achieved quality, embedded difficult detected. In addition, extracted two-dimensional a high scanned through electronic equipment information it acquired.