渐增负荷运动感情反应的变化模式研究*

研究的目的是探讨渐增负荷运动感情反应的变化模式.12名健康大学男生参加功率自行车渐增负荷运动,运动中和运动后测量血乳酸以确定个体乳酸阈,运动中每分钟测量主观运动强度和感情效价.结果显示,群组感情反应在时间上有显著差异,感情反应随强度递增呈线性和阶5下降模式,个体乳酸阈前1s及后面各点FS值均显著低于第1min、第2min的值.个体乳酸阈前感情反应均为积极,接近乳酸阏的感情反应有的积极有的消极,高于乳酸阈的感情反应大部分消极.     

经营理念视域下成人高等教育管理的问题与对策

目前成人高等教育管理的问题日益增多且日益严重化,原因固然是多方面的。但症结还在于管理体制的不合理和管理理念的陈旧落后,因而,成人高等教育管理引入经营理念,形成经营型的成人高等教育管理思路,是在市场经济条件下求得生存和迎接挑战的必然选择。     

脂肪酶发酵条件的统计学优化

从受油烟污染严重的土壤中分离到一株脂肪酶产量较高的菌株,通过统计实验设计的方法对发酵过程进行了优化。首先,通过Plackett-Burman设计实验,对影响产脂肪酶发酵的碳源、氮源、无机盐、pH、温度和转速等因素进行考察。通过实验,发现黄豆粉、K2HPO4和摇床转速对脂肪酶的产生影响较大。随后,利用曲面响应法中的中心点设计进行实验,以上述3个因素作为自变量。以发酵液的酶活作为响应,通过拟合最终得到了脂肪酶发酵的响应曲面函数。对该函数在一定的约束条件下求极值．得到了脂肪酶产率最大时的发酵条件。     

政府危机管理的工作原则解读

现代社会总会或多或少地爆发各种危机,危机在考验着各级政府的危机管理能力,文章通过对政府危机管理的工作原则进行解读,揭示了各项工作原则的含义、意义、贯彻落实的存在问题和措施。正确地把握这些工作原则的基本价值观念和基本工作规范,对提高政府的危机管理水平有着重大的意义。     

社会化问答平台提问回复率的预测研究——以“百度知道”为例

[目的/意义] 基于社会化问答平台提问回复率较低的现状，通过预测提问回复率，能够为社会化问答平台提升用户活跃度与留存率，改善用户体验提供参考。[方法/过程] 以"百度知道"为研究平台，抓取平台设置的14个话题下共10 640条提问记录，从提问特征与提问者特征角度，构建提问回复率影响因素的研究框架。采用二元Logistic回归对影响因素进行数据验证，构建提问回复率的预测模型，对模型准确率进行验证。[结果/结论] 社会化问答平台提问回复率研究可改善平台信息服务质量与促进用户知识贡献行为，实验结果验证了研究模型在社会化问答平台提问回复率预测中的有效性。     

A Statewide Analysis of North Carolina Public Libraries and Their Response to the Opioid Epidemic

ABSTRACT

This study sought to investigate the opioid epidemic impact on North Carolina public libraries. Libraries in half of all 100 counties were chosen through a random, geographically systematic process, and structured interviews were completed with library directors. Twenty directors were interviewed, representing 28 counties. All reported their communities were affected; nine reported direct impacts on library function. Fifteen directors felt libraries should be involved in response; some felt Narcan administration was beyond library purview. Two libraries reported having Narcan available; five reported providing staff training. Given librarians’ willingness to respond, it is time to provide necessary support for those efforts.     

Assessing risk of commercial sexual exploitation among children involved in the child welfare system

The objective of this study was to assess item characteristics indicative of the severity of risk for commercial sexual exploitation among a high-risk population of child welfare system involved youth to inform the construction of a screening tool. Existing studies have discerned factors that differentiate Commercial Sexual Exploitation of Children (CSEC) victims from sexual abuse victims, yet no research has been conducted to discriminate which items in a high risk population of youth are most predictive of CSEC. Using the National Survey of Child and Adolescent Well-Being (NSCAW) cohorts I and II, we examined responses from 1063 males and 1355 females ages 11 and older, over three interview periods.A 2-parameter logistic Item Response Theory (2 PL IRT) model was employed in order to examine item performance as potential indicators for the severity of risk for CSEC. Differential Item Functioning (DIF) analysis was conducted in order to examine potential differences in item responses based on gender. Modeling strategies to assess item difficulty and discrimination were outlined and Item Characteristic Curves for the final retained items were presented. Evidence for uniform DIF were present within items that asked about runaway, any drug use, suicidality, and experiencing severe violence. Results from this study can inform the construction of a screening instrument to assess the severity of risk for experiencing CSEC.     

Examination of Indices of High School Performance Based on the Graded Response Model

We examined summary indices of high school performance (coursework, grades, and test scores) based on the graded response model (GRM). The indices varied by inclusion of ACT test scores and whether high school courses were constrained to have the same difficulty and discrimination across groups of schools. The indices were examined with respect to skewness, incremental prediction of college degree attainment, and differences across racial/ethnic and socioeconomic subgroups. The most difficult high school courses to earn an “A” grade included calculus, chemistry, trigonometry, other advanced math, physics, algebra 2, and geometry. The GRM‐based indices were less skewed than simple high school grade point average (HSGPA) and had higher correlations with ACT Composite score. The index that included ACT test scores and allowed item parameters to vary by school group was most predictive of college degree attainment, but had larger subgroup differences. Implications for implementing multiple measure models for college readiness are discussed.     

Mis-spending on information security measures: Theory and experimental evidence

Information resources are becoming increasingly important to individuals and organizations, and ensuring their security is a major concern. While research in information security has adopted primarily a quantitative method to determine how and how much to invest in security, most decision makers rely on non-quantitative methods for this purpose, thereby introducing a considerable amount of as yet unexplained subjective judgment to the problem. We use a behavioral decision making approach to investigate factors causing possible inefficiencies of security spending decisions. Decision makers in our experiment performed a series of economic games featuring the key characteristics of a typical security problem. We found several biases in investment decisions. For budgeting their investment between major classes of security measures, decision makers demonstrated a strong bias toward investing in preventive measures rather than in detection and response measures, even though the task was designed to yield the same return on investment for both classes of measures. We term this phenomenon the “Prevention Bias.” Decision makers also reacted to security threats when the risk was so small that no investment was economically justified. For higher levels of risk that warranted some security investment, decision makers showed a strong tendency to overinvest. Theoretical and practical implications of the findings are discussed.     

基于改进风险矩阵法的学校体育竞赛风险评估研究

随着新时期学校体育工作对人才核心素养培养战略地位的逐步确立,学校体育竞赛的安全、有序、常态发展成为新时期各级各类学校体育治理的重中之重。如何针对新形势下的学校体育竞赛组织管理现状,有效实现学校体育竞赛风险防控与应对,突破学校体育竞赛风险管理桎梏,成为全面夯实且深入推进学校体育工作的重要议题。将改进风险矩阵法与德尔菲法、层次分析法充分结合,围绕人员风险、设施风险、组织管理风险及环境风险四大主线,确立了涵盖27个指标的学校体育竞赛风险指标体系,量化分析各风险指标的发生概率、影响力、风险等级、权重及其可接受性,进而提出新时期学校体育竞赛风险降低、风险转移、风险规避和风险接受的框架性应对措施。