一种新的可实现安全公钥密码体制——4次同余方程的应用

提出了一种新的、可实现安全的公钥密码体制,在采用原有的公钥、私钥的基础上,增加数量庞大、开销极低的公开参数集合;在每加密一批数据时选择一组新的不重复公开参数。提出了判断4次同余方程解结构及其求解的线性时间快速算法,以实现公开参数集合的操作。该安全方案可以主动抵御选择明文攻击与各种选择密文攻击,包括IND-CCA2,并且可以达到类似一次一密的安全效果。对于大批量数据的加密解密,计算和存储开销集中于第一个数据,自第二个之后只需要简单的异或操作;可应用于如RFID标签的低端产品或如无线网络等计算、存储、带宽等资源受到极大限制的设备中。     

高校二十四式太极拳教学方法之探讨

本文就二十四式“简化太极拳”教学过程中的相关问题加以探讨。     

Educational differences in health risks and illness over the life course: A test of cumulative disadvantage theory

This study tests the cumulative disadvantage hypothesis by examining the age-varying relationships between education, health risks, and disease onset and survival duration. Results based on 20 years of longitudinal data suggest that education is related to both the individual and accumulated number of behavioral, social, and economic health-risks, which in turn, are related to increasing educational differences in rates of disease incidence and survival. For hypertension, behavioral risks fully account for education’s negative effect on disease onset whereas educational differences in survival are best explained by the accumulation of social and economic risks. For heart attack, a combination of behavioral, social, and economic risks mediate the association between education and incidence, but neither the individual nor accumulated health-risks could account for education’s positive effect on surviving after a heart attack. Similar findings for diabetes and stroke are also discussed.     

大学生极端自我攻击心理生成机理及其预防对策探讨

在社会转型期,大学生自我攻击行为时有发生,这已是不争的事实.自我攻击是个体以自我生命有机体为代价来寻求自我解脱的情绪发泄方式.自我攻击行为轻则造成身体伤害,重则失去生命,这就是极端自我攻击.深入剖析大学生极端自我攻击心理生成机理、寻求有效的预防对策对于确保学生健康成长、维护和谐稳定具有十分重要的现实意义,这也是"以人为本"教育理念的要求.文章通过对2004-2008年全国高校大学生极端自我攻击案例的不完全统计分析,剖析大学生极端自我攻击行为发生的直接原因和社会根源,指出大学生极端自我攻击心理生成机理具有阶段性、外显性、否定性和可控性特征,并从"治本"和"治标"两个方面提出预防大学生极端自我攻击的对策建议.     

从《川魂——四川抗战档案史料选编》析1940年日军空袭重庆

日本为彻底摧毁中国军民的抗战意志,1940年对战时中国陪都重庆进行了疯狂轰炸。日军为此制定了“101作战计划”,在空袭中混合使用了集团轰炸、连续轰炸、照明轰炸以及投入零式航载战斗机的“零式”战略,给重庆造成 巨大损失,外国驻渝机构也未能幸免。空袭后,重庆的救赈工作比较及时,积极防卫,显示了重庆人民“愈炸愈强”的战斗信念,粉碎了日军炸垮重庆的野心,也在一定程度上实现了中国抗战“以空间换时间”、“持久消耗”的战略方针。     

网络恐怖主义的演变､发展与治理

网络恐怖主义属于恐怖主义的类型之一,它是一种新的恐怖战术,而不是新的恐怖形式.它以网络为攻击对象、犯罪工具或战略资源使其区别于传统的恐怖主义;以政治诉求为最终目的使其区别于一般的黑客行为.它大致经历了从对象型到工具型再到空间型、从单向型到互动型再到交叉型的演变过程,这既与网络技术的变革同步,又与恐怖组织结构的变化相关.在网络科技发展日新月异和传统恐怖活动备受打压的双重背景下,网络恐怖主义的专业化水平提高、分散化趋势明显、隐蔽性日益增强.我国治理网络恐怖主义要根据不同的类型采取防、反相结合的技术手段,从动态视角促进相关法律规范之间的有效衔接,借助大数据技术构建立体联动的信息共享、信息联动等反恐工作机制.     

Adversarial risk analysis for counterterrorism modeling

Recent large-scale terrorist attacks have raised interest in models for resource allocation against terrorist threats. The unifying theme in this area is the need to develop methods for the analysis of allocation decisions when risks stem from the intentional actions of intelligent adversaries. Most approaches to these problems have a game-theoretic flavor although there are also several interesting decision-analytic-based proposals. One of them is the recently introduced framework for adversarial risk analysis, which deals with decision-making problems that involve intelligent opponents and uncertain outcomes. We explore how adversarial risk analysis addresses some standard counterterrorism models: simultaneous defend-attack models, sequential defend-attack-defend models, and sequential defend-attack models with private information. For each model, we first assess critically what would be a typical game-theoretic approach and then provide the corresponding solution proposed by the adversarial risk analysis framework, emphasizing how to coherently assess a predictive probability model of the adversary's actions, in a context in which we aim at supporting decisions of a defender versus an attacker. This illustrates the application of adversarial risk analysis to basic counterterrorism models that may be used as basic building blocks for more complex risk analysis of counterterrorism problems.     

世界男子毽球运动发展趋势初探

根据第6届世界毽球锦标赛男子团体决赛的有关数据,对毽球运动发展方向和技战术特点进行了分析,结果表明,世界男子毽球运动将沿着高壮快准巧变、攻守凶悍和对抗日趋激烈及攻守技术更加全面高超的方向发展.     

调整二传技术与训练方法

当今攻击性发球和扣球日渐增强,第一传往往不能理想送到位,远网调整二传日趋增多,二传在比赛中的地位更加重要,但它却不能很好的受到人们的重视,针对全国排球联赛部分场次比赛的数据进行统计分析,突出调整二传在技战术运用中的重要性。