不允许卖空的风险证券组合最优选择的区间方法     

白先春 《预测》1999,18(6):62-63,61

本文利用区间分析方法有效地解决了在不允许卖空的条件下一类证券组合最优选择问题。  相似文献   

Examining the predictive validity of behavior screeners across measures and respondents     

Corey Jones  Emily Graybill  Brian Barger  Andrew T. Roach 《Psychology in the schools》2020,57(6):923-936

Through this study we compared different informants and different behavior screening tools that are available to screen for behavioral and emotional risk. We examined screening results from 100 students from a high school with a high achiever's magnet program in the Southeastern United States (school demographics: 71% female and 79% black, non-Hispanic). This school conducted behavior screening using both teacher-report via the Student Risk Screening Scale, Internalizing/Externalizing (SRSS-IE) and student report via the Strengths and Difficulties Questionnaire (SDQ). Nonparametric correlation tests were conducted between the SRSS-IE and SDQ externalizing and internalizing scores. Generalized linear regression models were created based on the data (demographics, internalizing, and externalizing scores on both screening tools) to model the two count outcomes (office discipline referrals [ODRs] and absences). Diagnostic accuracy metrics were generated from the scores on both the SRSS-IE and SDQ with the outcome measures (ODRs and absences). Externalizing scores on both screening tools had statistically significant low correlations. The ODR model contained two predictors: externalizing score on the SRSS-IE and internalizing score on the SDQ, while the absence model contained grade and the externalizing score on the SDQ. The highest accuracy and agreement values were seen between students with elevated risks on both screening measures and ODRs. The results confirmed that teacher and student reporting, as well as different screening tools, will result in some different students being identified. The choice of informant and screening tools should be dependent on the needs and resources of the school.  相似文献   

一类随机微分效用的风险厌恶性     

任欢 《黑龙江科技信息》2010,(19):173-173

通过倒向重随机微分方程引入了一类随机微分效用,讨论其风险厌恶性。  相似文献   

The social ecology of health promotion within war-effected refugee preschool children     

《Int J Intercult Relat》2023

Health promotion frameworks that identify the risk and protective factors in promoting the health of war-affected preschool children living in refugee camps are limited. This study aimed to identify ecological factors in refugee camps affecting the health promotion of children in a vulnerable population using the storytelling method. Twenty Syrian refugee children aged between five and six years were interviewed individually. Data were analyzed in NVivo V.11 software using thematic content analysis. Four major themes derived from the data included the following; risk factors that cause illness, awareness of the illness, strategies for coping with illness, and protecting and promoting health. These results suggest that health promotion programs targeting refugee children should be considered as a bio-socio-ecological approach.  相似文献   

Relationship quality,community promotion and brand loyalty in virtual communities: Evidence from free software communities     

Luis V. Casaló  Carlos Flavián  Miguel Guinalíu 《International Journal of Information Management》2010

The Internet has favored the growth of collaborative platforms where marketers and consumers interact to develop more engaging products and services. These platforms are usually centered in a specific brand/product and their members are linked by a shared admiration to that brand. This paper analyzes one of the most powerful online collaborative platforms, the free software (FS) case, which involves a lot of virtual communities developed around products such as Linux or Android, the new Google's mobile operating system. Our purpose is to determine some of the main antecedents and consequences of the consumer involvement in this type of communities. Results have shown that satisfaction with a virtual community may increase the level of consumer participation in that community. At the same time, a greater identification with the virtual community may increase indirectly the consumer participation thanks to the enhancement of his/her satisfaction with the community. We have also found positive and significant effects of consumer identification and participation on the level of community promotion. Finally, positive and significant effects of consumer participation and satisfaction with the community on loyalty to the FS were also found. These findings allow us to conclude some interesting managerial implications.  相似文献   

Understanding users’ behaviors regarding supply chain technology: Determinants impacting the adoption and implementation of RFID technology in South Korea     

Sanghyun Kim  Gary Garrison 《International Journal of Information Management》2010

Radio Frequency Identification (RFID), once a niche technology, is rapidly gaining the attention of retailers as a key enabler in their supply chain. As RFID moves into the mainstream, it is poised to replace the standard barcode as the technology that identifies and tracks products throughout the supply chain. In an attempt to gain competitive advantages, some retailers have begun the transition to RFID while others have been reluctant to embrace it. This study investigates South Korean retailers to identify key organizational characteristics that positively drive the evaluation of RFID. Further, this study assesses the impact one's evaluation has on the adoption and integration of RFID within their respective firm. Results from 278 adopting organizations show organizational needs (Ubiquity and Performance Gaps), perceived factors (Benefits and Cost Savings), and organizational readiness (Financial Resources and Technological Knowledge) have a significant influence on RFID Evaluation; and evaluation impacts its adoption, and integration.  相似文献   

Collaborative risk method for information security management practices: A case context within Turkey     

Sevgi Ozkan  Bilge Karabacak 《International Journal of Information Management》2010

In this case study, a collaborative risk method for information security management has been analyzed considering the common problems encountered during the implementation of ISO standards in eight Turkish public organizations. This proposed risk method has been applied within different public organizations and it has been demonstrated to be effective and problem-free. The fundamental issue is that there is no legislation that regulates the information security liabilities of the public organizations in Turkey. The findings and lessons learned presented in this case provide useful insights for practitioners when implementing information security management projects in other international public sector organizations.  相似文献   

知识集成对城市轨道交通施工安全风险管理系统功能影响分析     

李解  王建平  许娜  周哲 《科技管理研究》2017,(16)

为实现施工安全风险管理领域知识集成的发展,借助系统论、控制论与信息论分析城市轨道交通施工安全风险管理系统结构及功能实现过程,再以信息约束为切入点,研究知识集成改善信息约束后对系统功能的影响。研究结果表明,知识集成对系统功能的影响包括管理主体对风险认识更加客观、风险决策更加及时和风险管控行为更加合理三方面。  相似文献   

Exploring primary pupils’ experiences and understandings of ‘e-safety’     

Sue Cranmer  Neil Selwyn  John Potter 《Education and Information Technologies》2009,14(2):127-142

This paper examines the experiences and understandings of primary (K6) school pupils with regards to managing issues of risk and safety during their everyday use of information and communication technologies (ICTs). The paper is based on survey and interview data with pupils aged 7 to 11 years old in five English primary schools (n = 612). Analysis of these data shows that whilst most pupils recognised a general need to be mindful of ICT-related risks and dangers, their actual experiences of risk tended to be described in terms of operational problems encountered when using ICTs. Conversely, pupils’ understandings of potential risk were often based upon exaggerated fears deriving from a number of moral panics relating to child safety. These data suggest that official notions of ‘e-safety’ remain abstract and poorly understood concepts for many children. In considering what implications these data have for the ongoing ‘e-safety’ agenda in UK schools the paper concludes by suggesting three possible areas of change: (1) re-orientating the topic and tone of the official discourses surrounding e-safety; (2) increasing pedagogical interventions in primary schools aiming at enhancing pupils’ critical literacy skills; and (3) establishing a meaningful and sustained dialogue between pupils, teachers and parents about safety and risk when using ICTs.  相似文献   

从经济学的视角分析影响我国教师供给的因素     

吴飞燕 《教育学术月刊》2010,(5)

一国教师供给的数量与质量深刻的影响着该国的教育发展。目前,我国教师供给的状况是总量基本满足,教师过剩和教师短缺现象同时存在;教师供给质量参差不齐,优质教师资源短缺;教师供给结构性问题突出。影响教师供给的因素包括:预期报酬,生活工作条件,成为教师的成本,进入其他行业的机会,成为教师的风险等。  相似文献