This paper concerns with modeling and design of an algorithm for the portfolio selection problems with fixed transaction costs and minimum transaction lots. A mean-variance model for the portfolio selection problem is...This paper concerns with modeling and design of an algorithm for the portfolio selection problems with fixed transaction costs and minimum transaction lots. A mean-variance model for the portfolio selection problem is proposed, and the model is formulated as a non-smooth and nonlinear integer programming problem with multiple objective functions. As it has been proven that finding a feasible solution to the problem only is already NP-hard, based on NSGA-II and genetic algorithm for numerical optimization of constrained problems (Genocop), a multi-objective genetic algorithm (MOGA) is designed to solve the model. Its features comprise integer encoding and corresponding operators, and special treatment of constraints conditions. It is illustrated via a numerical example that the genetic algorithm can efficiently solve portfolio selection models proposed in this paper. This approach offers promise for the portfolio problems in practice.展开更多
Due to the information asymmetry on the securities market, Chinese listed companies have incentives to disclose voluntarily. Mandatory disclosure and voluntary disclosure are both included in an effective information ...Due to the information asymmetry on the securities market, Chinese listed companies have incentives to disclose voluntarily. Mandatory disclosure and voluntary disclosure are both included in an effective information disclosure system. Mandatory disclosure is the basic demand of the market, and voluntary disclosure is the extended demand of the market, because of its informative complement to the timing, content and depth of disclosure. With the weakening of seller＇s market characteristic in China, the voluntary disclosure behavior in the listed companies has been greatly encouraged. This paper provides a statistical description of the status quo of the voluntary disclosure behavior in Chinese listed companies, and claims that the voluntary disclosure strategy guided by the investor relations management should be included in the corporate strategies.展开更多
Objectives:To examine Chinese nurses'practice of reading and understanding scientific literature and elucidate the motivating and deterring factors.Methods:This is a cross-sectional study conducted between March a...Objectives:To examine Chinese nurses'practice of reading and understanding scientific literature and elucidate the motivating and deterring factors.Methods:This is a cross-sectional study conducted between March and June 2015.A random sample of 853 full-time registered nurses from three tertiary and two secondary hospitals in China filled out a set of self-administered questionnaires,including literature habit questionnaire(41 items),the situational motivation scale and the socio-demographic and professional characteristics questionnaire(15 items).Results:Significant majority(89.2%)of the respondents reported perception of barriers to keeping up to date with literature.The language barrier was the most prominent,followed by poor presentation and readability of articles.Using simpler language when writing articles,improving ones'foreign language proficiency and getting education or training on nursing research were raised as the top facilitators.Additionally,reading and understanding literature was significantly associated with the nurses'educational background,motivation,genders and work settings.Conclusions:The survey of the current status of literature education among Chinese nurses suggests that providing protected time,training for critical thinking,and incentive mechanisms will help improve nurses'engagement in literature and create a culture of academic inquiry.展开更多
Objectives Evidence-based healthcare contributes to the improvement of healthcare quality and informs healthcare decision-making.The provision of timely high-quality evidence is always required to fulfil the ever-chan...Objectives Evidence-based healthcare contributes to the improvement of healthcare quality and informs healthcare decision-making.The provision of timely high-quality evidence is always required to fulfil the ever-changing needs and expectations of healthcare personnel.This study aimed to assess the needs and expectations of healthcare personnel regarding evidence-based healthcare in China.Methods We conducted a cross-sectional online survey from December 8,2020 to January 15,2021 involving 901 participants across China.Healthcare providers,policy makers,researchers and educators,and full-time postgraduate medical and nursing students working/living in China were eligible to participate.A self-developed questionnaire was used.Results Participants generally agreed that health-related research evidence was beneficial.Evidence-based resources,such as Cochrane resources,were only known or used by about half of the respondents due to difficulties related to availability and accessibility.Various types of resources,topics of evidence,and themes of workshops were of particular interest to most of the participants.Conclusions The dissemination and translation of evidence,provision of more support in evidence availability,offering evidence-based training,and determining the most in-demand research areas have been identified as priority areas of work which could fulfil the needs and expectations of healthcare personnel in China.展开更多
Background： Prevalence of eating disorders （EDs） among college-aged athletes has risen in recent years. Although measures exist for assessing EDs, these measures have not been thoroughly reviewed in athletes. This ...Background： Prevalence of eating disorders （EDs） among college-aged athletes has risen in recent years. Although measures exist for assessing EDs, these measures have not been thoroughly reviewed in athletes. This study reviewed the validity and reliability evidence of the commonly used measures for assessing EDs in athlete populations aged 18--26 years. Methods： Databases were searched for studies of regarding ED on male and/or female athletes. Inclusion criteria stated the study （a） assessed EDs in an athlete population 18--26 years of age and （b） investigated EDs using a psychometric measure found valid and/or reliable in a non- athlete population and/or athlete population. Results： Fifty studies met the inclusion criteria. Seven and 22 articles, respectively, studied EDs behaviors in male and female athletes whereas 21 articles studied EDs in combined-gender samples. The five most commonly used measures were the Eating Attitudes Test （EAT）, Eating Disorder Inventory （EDI）, Bulimia Test-Revised （BULIT-R）, Questionnaire for Eating Disorder Diagnosis （QEDD）, and the Eating Disorder Examination Questionnaire （EDE-Q）. Conclusion： Only seven studies calculated validity coefficients within the study whereas 47 cited the validity coefficient. Twenty-six calculated a reliability coefficient whereas 47 cited the reliability of the ED measures. Four studies found validity evidence for the EAT, EDI, BULIT-R, QEDD, and EDE-Q in an athlete population. Few studies reviewed calculated validity and reliability coefficients of ED measures. Cross- validation of these measures in athlete populations is clearly needed.展开更多
This research venture investigates the trends and motives behind the English learning as a second language. The author has used the Chinese binoculars to probe into the phenomenon of English learning and teaching. Eng...This research venture investigates the trends and motives behind the English learning as a second language. The author has used the Chinese binoculars to probe into the phenomenon of English learning and teaching. English language has become an international tool of communication and business. Professional and students at China's Mainland have been learning English since long but this trend has been increased in the recent years due to the wave of globalization and also owing to the enormous emerging economy of China. Internationalization of education and the quest of knowing the culture and civilizations have spurred the need for English learning. The authors have performed a questionnaire based research with the sample of 130 university students learning Chinese at different English learning institutes at Xi＇an, Shanxi, China. The analysis of the findings in this research highlights the reasons behind the growing trends of English learning and also describes the teaching methodology for effective language teaching in the Chinese perspective.展开更多
Based on a questionnaire survey of Chinese public hospitals, this paper explores the consequence and realization path of balanced scorecard （BSC, hereafter） usage. The results show that BSC usage can improve hospita...Based on a questionnaire survey of Chinese public hospitals, this paper explores the consequence and realization path of balanced scorecard （BSC, hereafter） usage. The results show that BSC usage can improve hospital performance remarkably. With the structural equation model analysis, we further find that, this function is realized in an indirect way through the perception of organizational fairness and organizational commitment. The BSC has direct effect to improve the perception of organizational fairness and organizational commitment, which further influence the performance. The results not only complement empirical evidences for BSC usage, but also provide guidance to regulators and hospitals to implement BSC in compensation contract.展开更多
文摘This paper concerns with modeling and design of an algorithm for the portfolio selection problems with fixed transaction costs and minimum transaction lots. A mean-variance model for the portfolio selection problem is proposed, and the model is formulated as a non-smooth and nonlinear integer programming problem with multiple objective functions. As it has been proven that finding a feasible solution to the problem only is already NP-hard, based on NSGA-II and genetic algorithm for numerical optimization of constrained problems (Genocop), a multi-objective genetic algorithm (MOGA) is designed to solve the model. Its features comprise integer encoding and corresponding operators, and special treatment of constraints conditions. It is illustrated via a numerical example that the genetic algorithm can efficiently solve portfolio selection models proposed in this paper. This approach offers promise for the portfolio problems in practice.
文摘Due to the information asymmetry on the securities market, Chinese listed companies have incentives to disclose voluntarily. Mandatory disclosure and voluntary disclosure are both included in an effective information disclosure system. Mandatory disclosure is the basic demand of the market, and voluntary disclosure is the extended demand of the market, because of its informative complement to the timing, content and depth of disclosure. With the weakening of seller＇s market characteristic in China, the voluntary disclosure behavior in the listed companies has been greatly encouraged. This paper provides a statistical description of the status quo of the voluntary disclosure behavior in Chinese listed companies, and claims that the voluntary disclosure strategy guided by the investor relations management should be included in the corporate strategies.
文摘Objectives:To examine Chinese nurses'practice of reading and understanding scientific literature and elucidate the motivating and deterring factors.Methods:This is a cross-sectional study conducted between March and June 2015.A random sample of 853 full-time registered nurses from three tertiary and two secondary hospitals in China filled out a set of self-administered questionnaires,including literature habit questionnaire(41 items),the situational motivation scale and the socio-demographic and professional characteristics questionnaire(15 items).Results:Significant majority(89.2%)of the respondents reported perception of barriers to keeping up to date with literature.The language barrier was the most prominent,followed by poor presentation and readability of articles.Using simpler language when writing articles,improving ones'foreign language proficiency and getting education or training on nursing research were raised as the top facilitators.Additionally,reading and understanding literature was significantly associated with the nurses'educational background,motivation,genders and work settings.Conclusions:The survey of the current status of literature education among Chinese nurses suggests that providing protected time,training for critical thinking,and incentive mechanisms will help improve nurses'engagement in literature and create a culture of academic inquiry.
文摘Objectives Evidence-based healthcare contributes to the improvement of healthcare quality and informs healthcare decision-making.The provision of timely high-quality evidence is always required to fulfil the ever-changing needs and expectations of healthcare personnel.This study aimed to assess the needs and expectations of healthcare personnel regarding evidence-based healthcare in China.Methods We conducted a cross-sectional online survey from December 8,2020 to January 15,2021 involving 901 participants across China.Healthcare providers,policy makers,researchers and educators,and full-time postgraduate medical and nursing students working/living in China were eligible to participate.A self-developed questionnaire was used.Results Participants generally agreed that health-related research evidence was beneficial.Evidence-based resources,such as Cochrane resources,were only known or used by about half of the respondents due to difficulties related to availability and accessibility.Various types of resources,topics of evidence,and themes of workshops were of particular interest to most of the participants.Conclusions The dissemination and translation of evidence,provision of more support in evidence availability,offering evidence-based training,and determining the most in-demand research areas have been identified as priority areas of work which could fulfil the needs and expectations of healthcare personnel in China.
文摘Background： Prevalence of eating disorders （EDs） among college-aged athletes has risen in recent years. Although measures exist for assessing EDs, these measures have not been thoroughly reviewed in athletes. This study reviewed the validity and reliability evidence of the commonly used measures for assessing EDs in athlete populations aged 18--26 years. Methods： Databases were searched for studies of regarding ED on male and/or female athletes. Inclusion criteria stated the study （a） assessed EDs in an athlete population 18--26 years of age and （b） investigated EDs using a psychometric measure found valid and/or reliable in a non- athlete population and/or athlete population. Results： Fifty studies met the inclusion criteria. Seven and 22 articles, respectively, studied EDs behaviors in male and female athletes whereas 21 articles studied EDs in combined-gender samples. The five most commonly used measures were the Eating Attitudes Test （EAT）, Eating Disorder Inventory （EDI）, Bulimia Test-Revised （BULIT-R）, Questionnaire for Eating Disorder Diagnosis （QEDD）, and the Eating Disorder Examination Questionnaire （EDE-Q）. Conclusion： Only seven studies calculated validity coefficients within the study whereas 47 cited the validity coefficient. Twenty-six calculated a reliability coefficient whereas 47 cited the reliability of the ED measures. Four studies found validity evidence for the EAT, EDI, BULIT-R, QEDD, and EDE-Q in an athlete population. Few studies reviewed calculated validity and reliability coefficients of ED measures. Cross- validation of these measures in athlete populations is clearly needed.
文摘This research venture investigates the trends and motives behind the English learning as a second language. The author has used the Chinese binoculars to probe into the phenomenon of English learning and teaching. English language has become an international tool of communication and business. Professional and students at China's Mainland have been learning English since long but this trend has been increased in the recent years due to the wave of globalization and also owing to the enormous emerging economy of China. Internationalization of education and the quest of knowing the culture and civilizations have spurred the need for English learning. The authors have performed a questionnaire based research with the sample of 130 university students learning Chinese at different English learning institutes at Xi＇an, Shanxi, China. The analysis of the findings in this research highlights the reasons behind the growing trends of English learning and also describes the teaching methodology for effective language teaching in the Chinese perspective.
文摘Based on a questionnaire survey of Chinese public hospitals, this paper explores the consequence and realization path of balanced scorecard （BSC, hereafter） usage. The results show that BSC usage can improve hospital performance remarkably. With the structural equation model analysis, we further find that, this function is realized in an indirect way through the perception of organizational fairness and organizational commitment. The BSC has direct effect to improve the perception of organizational fairness and organizational commitment, which further influence the performance. The results not only complement empirical evidences for BSC usage, but also provide guidance to regulators and hospitals to implement BSC in compensation contract.
