基于PEPA的信息系统可生存性形式化模型

本文提出了一种基于PEPA的可生存性形式化建模方法,对攻击者和信息系统的交互行为进行精简抽象,构建面向系统可生存性的状态转换图。在此基础上,建立可量化的生存性形式化模型,为可生存系统的设计提供理论指导。     

浅谈高等数学教学与学生能力培养

高等教育的主要任务是培养具有创新精神和实践能力的复合型人才,而由于高等数学在不同学科、不同专业领域中所具有的通用性和基础性,使之在高校的课程体系中占有十分特殊的地位。在高等数学教学中,应重视数学思想方法的传导,加强知识过程的教学,渗透数学建模思想,并不断改革教学方法和教学手段,以达到在高等数学教学中培养学生的创新能力和实践能力的目的。     

加强和改进数学建模培训研究

数学建模培训是大学生数学建模竞赛的重要组成部分。应通过合理安排培训知识体系,优化组队方式,加大培训宣传,鼓励学生参训等,提高数学建模培训的效果。     

图像三维重建技术

基于图像的三维重建属于计算机视觉中的一个重要的研究方向,从提出到现在已有十多年的历史。文章首先对三维重建技术做了详细阐述,并着重从计算机图形学的研究角度对基于图像建模技术进行了综述,介绍了具有代表性的基于图像建模的方法及其最新研究进展,给出了这些方法的基本原理,并对这些方法进行分析比较,最后对基于图像建模技术的未来研究给出了一些建议和应解决的问题。     

高速列车车头曲面造型及网格生成

文章设计了高速列车车头曲面的造型流程,构造了复杂的高速列车车头曲面,提出了一种基于映射法的网格划分的方法,阐述了具体实施过程,编制了高速列车车头曲面的网格生成程序,由该程序生成的网格规整、实用。     

基于“家电以旧换新”回收数据评估电子废物产生量估算方法

比较了基于史坦福(Stanford)模型和保有量系数法对我国电子废物产生量的预测,并与中国家电以旧换新活动试点区域的实际回收统计数据进行对比,结果显示除电视机以外,两种估计方法的预测结果都显著高于以旧换新的实际回收数据.其原因首先是产品废弃量的变化深受产品技术变化影响,平板显示技术的快速普及导致CRT电视机废弃量出现短期激增,成为“家电以旧换新”实际回收品的主体,而洗衣机、电冰箱等传统大家电的产品实际使用寿命相对较长;其次是废旧产品回收面临非正式回收部门的竞争,以旧换新以较高的政府补贴引导一定数量的废弃产品流向正规处理企业,但还有相当数量的废旧产品流入了非正式的翻新加工和二手销售渠道.特别是空调和电脑,家庭消费占总消费量的比重较小,产品废弃后的材料回收价值和翻新维修价值都较高,补贴对提升回收量的影响相对较小;最后不同区域之间,预测结果与实际回收情况对比也存在明显的差别.考虑到家电以旧挟新政策停止以后,新颁布实施的废弃电器电子产品回收处理基金的补助力度大幅下降,有资质的回收处理企业重新陷入发展困境.有必要遵循生产者责任延伸制度的原则,积极鼓励扩大生产者的参与,从产品设计和废弃产品回收的逆向物流两方面提高回收利用系统的效率.同时,合理规划再生处理设施的区位和处理规模,需要根据区域和产品特点,对现有预测方法进行优化调整.     

The Role of Life Experiences on Perceptions of Leisure During Adulthood: A Longitudinal Analysis

This study examined the life experiences of adults and their effect on perceptions of leisure. Data for this study came from A Study of Leisure during Adulthood (ASOLDA), a 10-year study of the values, attitudes, and perceived freedom in leisure of 84 adults. Individual growth curve modeling was used to explore patterns and change within leisure domains for the sample. Life structure predicted adults’ perceived freedom in leisure while life events were predictive of adults’ leisure attitudes. Data from interviews were used to supplement the survey data to provide a better understanding of the predictors of leisure perceptions in this study.     

Body Image and Beliefs About Appearance: Constraints on the Leisure of College-Age and Middle-Age Women

Reducing adolescent substance use is important in South Africa, a developing nation with increasing adolescent substance use, lack of leisure/recreation opportunities, and high rates of adolescent discretionary time. Previous research suggests leisure boredom and adolescent substance use co-occur in this setting. Using longitudinal data from 2,580 South African adolescents as they progressed from the 8th to 11th grade, the current study disentangles the associations of trait and state leisure boredom with substance use, and examines how ability to restructure boring situations moderates those associations. On average, individuals with higher trait boredom used more substances, and on occasions when state boredom was high, the prototypical adolescent used more substances. Although restructuring did not moderate these associations, greater ability was associated with lower substance use independent of leisure boredom. Findings illustrated the importance of considering how trait and state aspects of leisure may contribute to adolescents’ risk behavior and addressed through preventive intervention.     

Marketing sustainable tourism: the role of value orientation,well-being and credibility

Abstract

Marketing for sustainable tourism primarily attracts customers with a biospheric–altruistic value orientation. To reach a broader consumer group and also persuade people with a self-enhancement orientation to book sustainable hotels, the effectiveness of three different communication styles (emotionality levels, amount of sustainability information and inclusion of a label) is investigated, considering the consumer’s value orientation. An experiment with 337 participants was conducted to analyze the effects of communication on consumer perceptions of well-being and credibility. Multigroup structural equation modeling was used to compare the impacts of communication style on participant’s attitude toward booking a sustainable hotel, mediated by well-being and credibility. The results highlight significantly different communication effects among the two contrasting target groups. Consumers who are highly interested in sustainability (biospheric–altruistic value orientation) are persuaded by messages that include details about the hotel’s sustainability performance, in order to increase the social–environmental well-being, whereas for customers who are less interested in sustainability (self-enhancement value orientation), a self-referential emotionally communication is essential, as it increases the emotional well-being. Inconsistent findings regarding the role of communication in raising the perception of credibility were obtained.     

The Effect of Technology Readiness on Customers' Attitudes toward Self-Service Technology and Its Adoption; The Empirical Study of U.S. Airline Self-Service Check-In Kiosks

Airline self-service check-in kiosks are increasingly becoming an option for today's passengers. This article aims to develop a model, using the technology readiness (TR) construct, to predict passenger's intentions to use a self-service check-in kiosk. Structural Equation Modeling is applied to determine the validity of the model and the hypotheses. The findings show that TR has a positive effect on attitudes toward kiosks, attitudes toward the kiosk provider, and overall intentions to use a kiosk. Interestingly, attitudes toward kiosks positively affect attitude toward the kiosk provider. Further research recommends using cross-cultural data.