Using honeynodes for defense against jamming attacks in wireless infrastructure-based networks

The advent of wireless networks has brought a new set of security issues with it. One of the most feared of these is the jamming-based attacks. In this paper, we propose a pre-emptive detection strategy using honeynodes and a response mechanism based on the existing Channel Surfing Algorithm [Xu W, Trappe W, Zhang Y, Wood T. Channel surfing and spatial retreats: defenses against wireless denial of service. ACM Wireless Security 2004;80-9] to protect wireless nodes from a jammer. Honeynodes generate dummy communication at a frequency close to the actual frequency of operation, and pre-emptively alert authentic nodes of imminent attacks, so that the authentic nodes can jump to another frequency even before a jammer starts scanning that frequency. The next frequency is selected using a novel approach which uses a hybrid of reactive and proactive channel selection procedures. We have simulated the proposed approach using NS-2. The experimental results further prove a marked improvement in the performance of the proposed system over the Channel Surfing Algorithm in terms of the packet delivery ratio, the jammed duration, control message overhead and the number of channel re-configurations.     

黑客入侵防护体系研究与设计

该文全面地介绍了黑客及黑客攻击造成的危害,列举了一些著名的黑客攻击工具,在详细分析黑客攻击手段及其防范措施的基础上,结合实践经验和研究成果,给出一个有效的黑客入侵防护体系的设计与实现。     

Towards a contingent approach of customer involvement in defence projects: An exploratory study

This paper reports the main results of an exploratory, multiple case study investigating customer involvement practices in system development projects in the Israeli defence industry. The study proposes and examines a theoretical contingency model regarding the effect of customer involvement modes on project success, moderated by project characteristics. It focuses specifically on the working mode of customers' representatives along the continuum between external supervision to full participation in project activities.     

Effects of nitric oxide on the alleviation of postharvest disease induced by Penicillium italicum in navel orange fruits

The present study evaluated the effects of 15 μL L^-1 nitric oxide (NO) on the fruit defence response of ‘Newhall’ navel orange. The decay rate of NO-treated navel orange fruits was significantly lower than that of control fruits during storage at 20 °C storage (P < 0.05). Treatment with NO suppressed the increase in disease incidence and lesion area in orange fruits inoculated with Penicillium italicum (P. italicum); significantly increased the activities of phenolic metabolism-associated enzymes and pathogenesis-related (PR) proteins, including polyphenoloxidase (PPO), phenylalanine ammonia-lyase (PAL), β-1,3-glucanase (GLU) and chitinase (CHT); and enhanced the activities of key enzymes, including 4-coumarate: CoA ligase (4CL), cinnamate-4-hydroxylase (C4H) and chalcone isomerase (CHI) in the phenylpropanoid pathway. The contents of total phenolics, flavonoids and lignin were also higher in NO-treated fruits than in control fruits. The findings suggest that exogenous NO could induce disease resistance against P. italicum in navel orange fruits.     

核电厂操纵员心理防御方式问卷调查

随机选取84名核电厂操纵员,采用《防御方式问卷》法调查操纵员的心理防御方式特征。结果表明:(1)操纵员的成熟防御方式(DSQ因子二)均分最高。(2)与≤30岁年龄段相比,31～35岁及≥35岁年龄段操纵员采用成熟防御方式以及成熟防御方式中的升华差异显著;31～35岁年龄段操纵员采用成熟防御方式中的幽默最多,且差异显著。     

浅谈人事风险及其监控和防范

论述了人事风险是组织内人员的行为违背客观规律、偏离组织目标,给组织造成损失或损害;造成企业非正常损耗有形资产;干扰和破坏总体战略;损害企业信誉;降低配置效率;阻碍组织发展。很多企业把注意力集中在对付经营风险和财务风险上。人事风险具有较大的隐蔽性和突发性。应该通过各种措施来防范人事风险。     

Comparative study of flavonoid and scoparone accumulation in different Citrus species and their susceptibility to Penicillium digitatum

Fungi of the genus Penicillium are responsible for substantial post-harvest losses in Citrus fruits. The results obtained following artificial inoculation of Citrus fruits with Penicillium digitatum showed that the degree of fungal development depended on the Citrus species. Thus, the mature fruit of Citrus paradisi were more susceptible to this fungus than the mature fruit of Citrus limon, Citrus sinensis,Citrus clementina Hort. ex Tan., and Citrus unshiu (mak) Marc. The results point to an inverse correlation between the degree of susceptibility of Citrus species to this fungus and the flavanone content – hesperidin in C. sinensis, C. clementina Hort. ex Tan. and C. unshiu (mak) Marc.; naringin in C. paradisi and the flavanone hesperidin and the flavone diosmin in C. limon. Thus, in C. sinensis,C. clementina Hort. ex Tan and C. unshiu (mak) Marc. the highest levels of the polymethoxyflavones, sinensetin, tangeretin, heptamethoxyflavone and nobiletin, were observed in the least susceptible varieties and viceversa. In the case of C. paradisi, no significant differences were detected in the polymethoxyflavone levels between varieties, while in C. limon, polymethoxyflavones were hardly detectable. The production of scoparone was observed in all the species and varieties studied after inoculation with the fungus, especially in C. limon fruits. Based on the evidence, it seems that flavanones, flavones, polymethoxyflavones (phytoanticipins) and scoparone (a phytoalexin) may well be involved in the defence mechanisms of Citrus fruits against P. digitatum. Depending on the Citrus species in question, the relative participation of one group of secondary compounds or another may vary.     

内在的地方──对镇海海防历史纪念馆设计创作的思考

从我们在招宝山顶画出第一张草图到现在，已有近三年的时间了。这期间，空间和实体的形象在我们的脑中由模糊而清晰，由笼统而具体，最后贯彻在施工的细部中。现在它已接近完成了。这是一座地方自己筹资建设的纪念馆。这是一个从地方的形象记忆和潜在精神中产生的建筑。它是对地方的纪念。镇海，位于浙江省东端丽江出海口，蚊门虎距，重关天设，自古为两浙咽喉，兵家必争之地。自明代以来，我国东南沿海屡次遭受外族侵犯，镇海口遂成为抗击外来侵略的海防重镇。直至近代的抗日战争，在这里进行的大小战役达46次之多。我国历史上著名的民族英…     

因岭而兴的湖北古镇--钟祥张集

该文从湖北钟祥张集古镇特殊的地理环境背景出发,分析了"枕山环水"的选址特色,"三山·两河·一老街·一新区"的空间格局以及"两关三巷六门"的防卫型布局特点,研究了街巷空间尺度,双重檐建筑特色及排水系统.     

人防地下室结构施工质量控制要点

人防地下室工程具有平战两用工程,使用功能范围广,质量要求高,本文针对某人防地下室的施工过程和验收结果,提出几点质量控制要点来防止混凝土结构裂缝、渗水、漏气、沉降等质量问题。