基于SQL Server应用系统的安全性研究

介绍了基于SQL Server数据库应用的安全保护机制,对其身份验证、利用视图和触发器有效地保护数据安全的机制进行了详细分析,提出了在数据库应用系统中可采用的安全体系和具体处理方法,并结合网络MIS系统的开发实践给出了一些解决方案。     

保障石油供应 维护石油安全

通过我国与美国石油工业供需发展情况的对比，在分析美国石油工业发展的经验、结合我国石油工业自身特点和不足的基础上，对我国的石油供应提出了几点建议。     

我国改革开放30年回顾及未来改革的思考

总结改革开放30年的历史进程,可以划分为不同阶段,但总体上属于渐进性改革和以市场化为取向的改革,改革的核心是制度创新。改革开放的成就举世瞩目,也积累了宝贵经验,主要是本着以发展为主线、充分调动多数人积极性、"摸着石头过河"、循序渐进、整体协调的原则推进改革,并坚持改革与开放的协同并进。但也存在着一些不完善之处,主要有政府自身改革不到位、在抑制资源消耗和保护生态环境方面改革动作迟缓、改革发展的成果共享不够、政治体制改革滞后于经济体制改革等。今后应以促进"两个发展"即促进生产力发展、促进人的全面发展为轴心,以"三化"即深度市场化、法治化和国际化作为深化改革的战略取向,坚持经济体制改革、政治体制改革、社会体制改革、文化体制改革"四位一体"协调配套、同步推进。     

一种利用机器学习优化MIMO窃听信道天线选择的方法

为保障多输入多输出窃听信道系统中信息传输的保密性,提出了一种基于机器学习的天线选择方案。首先利用机器学习解决分类问题准确率高、处理大数据高效这一优势,设计了基于奇异值分解的特征值提取、基于信干噪比的标签赋值方案,建立了k最近邻分类器和逻辑回归分类器选择最优天线最大化保密性能（可达保密速率和保密中断概率）。与传统天线选择方案相比,所提方案获得了几乎一致的保密性能,并且大幅降低了系统的选择复杂度和误比特率。     

The COVID-19 pandemic and organisational commitment of senior hotel managers

The COVID-19 pandemic will reduce the attractiveness of hospitality occupations. This particularly concerns senior management positions whose holders may substitute hospitality jobs with more secure and rewarding employment in other economic sectors. Organisational resilience of hospitality businesses, including their response to COVID-19, and corporate social responsibility (CSR) practices may, however, affect perceived job security of senior managers and, thus, influence their commitment to remain in their host organisations. This paper quantitatively tests the inter-linkages between the above variables on a sample of senior managers in hotels in Spain. It finds that the levels of organisational resilience and the extent of CSR practices reinforce perceived job security of managers which, in turn, determines their organisational commitment. Organisational response to COVID-19 affects perceived job security and enhances managers’ organisational commitment. To retain senior management teams in light of future disastrous events, hotels should, therefore, strengthen their organisational resilience and invest in CSR.     

Appetite for destruction: Counterintuitive effects of attractive faces on people's food choices

Faces in general and attractive faces, in particular, are frequently used in marketing, advertising, and packaging design. However, few studies have examined the effects of attractive faces on people's choice behavior. The present research examines whether attractive (vs. unattractive) faces increase individuals’ inclination to choose either healthy or unhealthy foods. In contrast to the beliefs held by most marketing professors, but consistent with visceral state theories, exposure to attractive (vs. unattractive) opposite-sex faces increased choice likelihood of unhealthy foods. This effect was moderated by self-view-relevant attributes and exerted a particularly powerful influence on individuals who were single (vs. in a relationship) and individuals rating themselves as unattractive (vs. attractive). Furthermore, the effect was mediated by arousal, was stronger for men than for women, but did not generalize after exposure to attractive (vs. unattractive) same-sex faces. As pictorial exposure is sufficient for the effect to occur, these findings have important implications for marketing, advertising, and public health.     

Understanding the drivers of organic foods purchasing of millennials: Evidence from Brazil and Spain

This paper examines the antecedents of millennials' organic food purchasing. A conceptual framework, based on product characteristics, and consumers' concerns and consciousness, is proposed. Data collection was conducted through a survey in two culturally and socioeconomically distinct countries (Brazil vs. Spain) to increase the robustness and generalizability of the results. The results show that product characteristics and consumer concerns improve millennials’ health consciousness and increase their social consciousness, which, in turn, increase their willingness to pay a price premium and their purchase frequency of organic foods. The findings show that the proposed model has high validity, with only one significant difference between the two countries. Theoretical contributions and managerial implications are discussed.     

中国城乡社会养老保险制度的对比分析

通过中国城镇社会养老保险与农村社会养老保险的对比研究,分析农村社会养老保险的特点与悖逆,并从中国城乡社会、经济发展一体化,中国城乡社会保障制度融合化,世界社会保障制度改革趋同化的角度预测中国农村社会养老保险的改革方向和发展趋势。     

”枷锁“还是“激励”？社会保险与创业

基于最新发布的中国家庭追踪调查数据（2016CFPS）,运用Logit 模型分析了社会保险对创业的影响。研究发现,不同社会保险项目对居民创业存在显著差异,养老保险对创业具有显著的“枷锁效应”,医疗保险则具有显著的“激励效应”。通过运用工具变量法和倾向得分匹配法控制了样本选择性偏误和内生性后,依然支持研究结果。机制分析表明医疗保险通过缓解医疗费用支出来促进创业,养老保险则是通过降低金融风险投资概率对创业产生负向影响。文章进一步指出,医疗保险对创业的“激励效应”主要在40 岁以下的农村居民;养老保险的“枷锁效应” 则主要在40 以下的城镇居民。     

对当前国有商业银行改革的战略思考

银行改革的成功与否决定着中国金融改革的成败.国有银行体制转轨的路径选择应该是股权多元化的产权结构改革和放开行业管制的市场结构改革并重的综合改革,当前要警惕其引入战略投资者后强化行业的行政垄断,由"内部人控制"演变成"外部人控制",损害国家金融安全.银行业应该全面对内资(特别是民间投资者)开放,对外资的开放须循序渐进.