基于属性综合评价系统的漏洞静态严重性评估

针对计算机安全漏洞的静态严重性评估问题,提出了一种基于属性综合评价系统的漏洞静态严重性分析方法。该方法从漏洞的基本属性中提取漏洞的威胁性、影响度、流行性和修补难易4个指标,运用属性综合评价系统理论评价其静态严重性,获得二元组表示的漏洞静态严重性,其中的定性表示值表示漏洞的静态严重性等级,定量表示值表示漏洞静态严重性分值。应用实例表明该方法对于漏洞静态严重性的评估是准确有效的。相比于现有的漏洞严重性分析方法,该方法兼备了定性和定量表示的优点,体现了同一级别之下不同漏洞的静态严重性的细微差别     

云南电网电子污区分布图绘制及其应用功能开发

智能电子污区分布图系统以GIS系统为基础,通过模块化的规则库设置,对污染源、污湿特性、运行经验和现场污秽度四大因素进行定性和定量分析,形成污区分布图成图规则库,借助污秽等级冲突调整、边界缓冲处理、综合因素叠加等手段实现成图算法,绘制出云南电网电子污区分布图。基于电子污区分布图平台开发了输变电设备外绝缘配置辅助分析功能,可实现新建线路外绝缘绝缘配置建议,电网当前防污状况评估等辅助决策功能,让电子污区分布图的应用融合到输变电设备规划、设计和运行各个阶段。     

网络系统生存性分析研究*

在对网络攻击理论深入研究的基础上,通过建立攻击模型,构造攻击场景,对目标系统实施攻击测试,分析攻击对目标系统造成的危害和系统的可恢复性,判断其是否达到系统的生存性需求,并提出相应改进建议.     

基于证据理论和效用理论的电力系统风险评估

在所提出的风险评估模型中,将线路的故障可能性看做随机模糊数,基于证据理论构造了架空线路的故障可能性模型,可更好地反映外部环境对线路故障可能性的影响;并采用效用函数度量电力系统元件故障损失带来的不满意程度,所给出的指标能灵敏地反映电力系统故障风险的变化趋势,符合电网运行实际;最后以北京电网为例,说明了该方法的可行性和有效性。     

Enhanced Priming for Trauma-Related Material in Posttraumatic Stress Disorder.

Intrusive reexperiencing in posttraumatic stress disorder (PTSD) has been linked to perceptual priming for trauma-related material. A prospective longitudinal study (N = 69) investigated perceptual priming for trauma-related, general threat, and neutral words in assault survivors with and without PTSD, using a new version of the word-stem completion task. Survivors with PTSD showed enhanced priming for trauma-related words. Furthermore, priming for trauma-related words measured soon after the trauma was associated with subsequent PTSD severity at 3, 6, and 9 months. The enhanced priming effect was specific to trauma-related words. Enhanced perceptual priming for traumatic material appears to be one of the cognitive processes operating in PTSD. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The safety of urban cycle tracks: A review of the literature

Cycling has to be a safe activity, and perceived as such, if bicycle trips by all populations are to increase and the public health benefits are to be realized. A key characteristic of developed countries with a high cycling mode share is their provision of cycle tracks – separated bikeways along city streets – on major routes. This literature review therefore sought to examine studies of cycle tracks from different countries in order elucidate the safety of these facilities relative to cycling in the street and to point to areas where further research is needed. The review indicates that one-way cycle tracks are generally safer at intersections than two-way and that, when effective intersection treatments are employed, constructing cycle tracks on busy streets reduces collisions and injuries. The evidence also suggests that, when controlling for exposure and including all collision types, building one-way cycle tracks reduces injury severity even when such intersection treatments are not employed. However, the extent of this effect has not been well examined, as very few studies both look at severity and control for exposure. Future studies of the safety of cycle tracks and associated intersection treatments should focus foremost on examining injury severity, while controlling for exposure. In the U.S., where the obesity epidemic and its health consequences and costs are well documented, the benefits of increased cycling should be a focus of research and policy development in order to provide the infrastructure needed to attract people to cycling while minimizing injuries.     

汽轮机转子高速动平衡技术研究

叙述了柔性转子影响系数法的平衡原理、平衡步骤和大型旋转机械振动烈度的品质评定标准,圆满完成了一个大修后的N102JHP汽轮机转子的高速动平衡试验,效果良好。研究表明:高速动平衡是降低汽轮机转子振动的一种有效方法。     

Characterization of clinical mastitis occurring in cows on 50 large dairy herds in Wisconsin

In recent years, the US dairy industry has experienced significant demographic changes, with an increase in the number of large herds. The objectives of the present study were to characterize clinical mastitis occurring in cows on large dairy herds in Wisconsin. Participating herds (n = 50) were required to have a minimum of 200 lactating animals, participate in monthly DHI testing (including monthly individual cow somatic cell count), use computerized herd records, use a milking routine that included fore-stripping quarters for detection of mastitis, and use antimicrobials to treat affected cows. After study personnel visited the farm, each herd was instructed to enroll the next 17 cows that experienced clinical mastitis, regardless of severity. At detection of clinical mastitis and 14 to 21 d after treatment ended, duplicate quarter milk samples were collected from all affected quarters and used for microbiological analysis. Treatments of affected cows were performed according to existing individual farm protocols. Cow level follow-up data was collected for 90 d after enrollment. Microbiological diagnoses at enrollment included gram-negative (35.6%), no growth (27.3%), gram-positive (27.5%), and other (9.6%). Of the 741 cases, the most prevalent pathogens were Escherichia coli (22.5%), followed by environmental streptococci (12.8%), Klebsiella spp. (6.9%), and coagulase-negative staphylococci (6.1%). Bacteriological cure was 75.0% for cases caused by gram-negative pathogens (n = 136), 50.8% for cases caused by gram-positive pathogens (n = 128), 47.5% for cases caused by other pathogens (n = 40), and 73.2% for cases which did not result in microbial growth (n = 123). Of the 583 cases with severity recorded, the distribution of mild, moderate, and severe symptoms was 47.8, 36.9, and 15.3%, respectively. The majority of cases presenting with severe symptoms were caused by gram-negative pathogens. Treatment cure was greater for gram-negative pathogens and cases for which no pathogens were recovered as compared with cases caused by other etiologies. Cows experiencing severe cases were more likely to receive multiple antimicrobial treatments.     

Communality of manic-depressive and "mild" cyclothymic characteristics.

This study examined the assumption that similar personality and genetic attributes are associated with varying severities of cyclothymic tendency. Several mood measures were used for identifying college Ss with cyclothymic tendencies. The personality variables investigated are related to a complaint dependent, value achievement orientation. Relative incidence of blood type and blood factors D, E, MN, and Kell for cyclothymics and noncyclothymics was determined. Mood measure intercorrelations were insignificant. Correlations between mood indices derived from a daily self-rating scale and the personality variables afforded moderate support for the personality aspect of the continuity assumption. Analysis of the blood types and factors did not support the genetic aspect of the assumption. (37 ref.) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

A joint-probability approach to crash prediction models

Many road safety researchers have used crash prediction models, such as Poisson and negative binomial regression models, to investigate the associations between crash occurrence and explanatory factors. Typically, they have attempted to separately model the crash frequencies of different severity levels. However, this method may suffer from serious correlations between the model estimates among different levels of crash severity. Despite efforts to improve the statistical fit of crash prediction models by modifying the data structure and model estimation method, little work has addressed the appropriate interpretation of the effects of explanatory factors on crash occurrence among different levels of crash severity. In this paper, a joint probability model is developed to integrate the predictions of both crash occurrence and crash severity into a single framework. For instance, the Markov chain Monte Carlo (MCMC) approach full Bayesian method is applied to estimate the effects of explanatory factors. As an illustration of the appropriateness of the proposed joint probability model, a case study is conducted on crash risk at signalized intersections in Hong Kong. The results of the case study indicate that the proposed model demonstrates a good statistical fit and provides an appropriate analysis of the influences of explanatory factors.