基于记忆特性的LSB密写

LSB密写技术是目前一种应用最为广泛的数据隐藏技术。本文通过对LSB密写算法的分析,指出了对载体图像进行LSB密写会引起图像统计特性改变的原因,并在此基础上提出了一种基于记忆特性的LSB密写算法。该算法记录下载体已经进行密写部分的统计特性,如果被嵌入的秘密比特与原始像素值的最低位相同,就不作改动;否则就根据该统计特性进行增1或减1的调整;在接收方,提取信息时只需要将载体图像的最低比特位提取、解密即可恢复秘密信息。该算法具有较高的隐蔽性,能够有效地抵抗统计分析方法。     

延缓衰老研究

退化是生命衰老的一种表现,本文通过了解衰老,对其进行研究后得出若干延缓衰老的方法。     

微机内存管理机制的分析及优化配置

从硬件和软件两个方面分析微机内部存储器的构原理及管理机制,讨论微机单机,网络工作站的内存配置的几个重要问题。     

Memories of childhood sexual abuse: a survey of young adults

Objective: To explore the prevalence of, characteristics of, and factors associated with forgetting of childhood sexual abuse memories in a large non-clinical sample (N = 1712).Method: Using an anonymous survey, we asked respondents about (a) the nature and severity of their childhood abuse; (b) the continuity of their abuse memories; and (c) their experiences with others suggesting to them that they might have been abused.Results: A substantial minority of victims in our sample reported having temporarily forgotten their childhood sexual abuse. Forgetting was largely unassociated with victim or abuse characteristics. Compared to individuals who always remembered their abuse, however, individuals who temporarily forgot were more likely to report that someone had suggested to them that they might have experienced abuse. Those who received such suggestions were particularly likely to suspect that they may have experienced childhood sexual abuse that they do not yet remember.Conclusion: Forgetting may be less common than implied by earlier estimates from clinical samples, yet it is not uncommon. Also, a sizable minority of the population is wondering whether they have experienced unremembered abuse, and these suspicions are linked to having encountered suggestions from others. We discuss the implications of these findings for understanding the phenomenon sometimes labeled repression.Spanish abstract was not available at time of publication.     

Investigating the testing effect: Retrieval as a characteristic of effective study strategies

Presently, the most common approach to examining the testing effect is using a free recall form of retrieval practice. In this experiment, we compared free recall to other retrieval-based study strategies including practice quizzing, test-generation, and keyword. We also examined the possible benefit of coupling these retrieval-based strategies with free recall. A total of 338 undergraduates were randomly assigned to one of the nine conditions: a repeated retrieval (study-test) learning condition paired with one of the four retrieval-based strategies, a single retrieval (study-study) learning condition paired with a retrieval-based strategy, or a rehearsal (study-study-study) condition. Following a 7-day delay, students completed a test assessing retention of information learned. There was a significant interaction between learning condition (repeated vs. single retrieval practice) and type of retrieval-based strategy. Free recall and practice quizzing were the most effective types of retrieval practice, and coupling testgeneration and practice quizzing with free recall led to significant benefits in performance.     

大数据环境下资源负荷短期预测时间跨度估计

大数据环境下资源负荷短期预测时间跨度计算是提高大数据资源调度和数据集成的基础。通过对大数据环境下资源负荷短期预测时间跨度的准确估计,提高资源负荷的预测性能。提出一种基于非线性差分相点融合估计的资源负荷短期预测时间跨度估计算法。构建大数据环境下资源负荷模型,基于非线性差分相点融合估计的资源负荷短期预测时间跨度估计,进行非线性差分相点融合,进行全网拓扑信息激励传播均衡设计,通过频繁的切换来进行网络选区,将时间划分为连续区间,重新分配大数据环境下的时间跨度,最后得到基于线性差智能群辨识的资源短期预测时间跨度估计算法改进。仿真结果表明,该算法具有较好的时间跨度估计性能,提高了大数据环境下的资源负荷预测精度,具有较小的任务调度路径延时和能耗损失,为提高云平台的资源利用效率提供基础,展示了较好的应用价值。     

Hamilton体系下海底悬跨管道动力特性分析

鉴于海底油气管道的悬跨易引发管道不稳定性、疲劳破坏等问题,影响管道运行安全,对复杂载荷联合作用下海底悬跨管道的结构动力特性进行研究.首先建立海底悬跨管道的非线性动力方程,引入对偶变量将方程转化为Hamilton体系下的辛对偶正则方程组.然后运用精细积分法求解方程组,讨论不同内流流速、压强、材料阻尼等参数对海底悬跨管道动力响应特性的影响.计算结果表明涡激振动中主振动为横向振动,振动响应幅值随内流速度、压强和轴向力的增加而增大,而材料黏弹性系数对振幅的影响不大.     

剪跨比对BFRP筋混凝土梁抗剪性能影响的研究

玄武岩纤维具有优异的耐腐蚀性能,采用玄武岩纤维材料（BFRP）筋代替钢筋是一种解决钢筋锈蚀问题的潜在方法。通过6根试验梁,研究不同剪跨比下BFRP筋混凝土粱的抗剪性能。试验表明,BFRP筋混凝土梁呈脆性破坏,破坏位置集中在分配梁加载点附近;随着剪跨比的减小,斜截面初裂荷载逐渐提高,且逐渐接近于极限荷载;混凝土梁开裂前,挠度增长缓慢,开裂后增长较快,表现为荷载-挠度曲线呈折现变化。     

Building Listening Theory: The Validation of the Conversational Listening Span

Gender differences in employee perceptions of the social support they received from sources in a multicultural organization are explored using a sample of employees born in Mexico and El Salvador currently working in the United States. Men reported receiving significantly more help with personal problems, praise, and job‐related help than women reported receiving. The relationship between emotional acculturative stress and perceived social support also was explored. Women experienced significantly more emotional acculturative stress than men reported. Intraorganimtional social support was unrelated to the emotional acculturative stress of women. Social support in the form of praise was significantly related to men's emotional acculturative stress.