共查询到20条相似文献，搜索用时 531 毫秒
1.
《科技通报》2015,(10)
对信息源位置的隐私保护算法设计是保证网络用户通信安全基础,传统的隐私保护算法采用群签名跟踪算法,存储和搜索代价大,且具有可追踪的特点,保护性能不好。提出一种基于同态映射联合追踪的信息源位置隐私保护算法。以车用自组网络为例,进行信息源位置隐私保护系统初始化构建,在安全和隐私增强的情况下兼顾效率,采用批验证和撤销预处理减少验证和撤销检测的计算量,通过同态映射联合追踪,得到隐私保护的相对差异,调节平均偏差和方差,发送联合追踪请求,进行同态映射操作,提高隐私保护性能。仿真结果得出,算法具有较好的隐私保护性能,新算法在隐私保护水平和数据实用性方面较传统算法有明显改善。 相似文献
2.
提出一种基于高阶贝塞尔函数预测控制的路由空洞填补算法,进行移动网络电磁波通信路由协议设计,设计高阶贝塞尔函数特性及预测控制技术,采用高阶贝塞尔函数预测控制技术,通过移动网络电磁波通信网进行信息传输,产生不同的层次分类属性,实现对空洞填补算法改进。实验结果表明,算法能使路由空洞空间支路减少,边缘空间增益得到有效控制,降低误码率,提高移动网络电磁波通信系统的通信性能。 相似文献
3.
《科技通报》2015,(9)
社交网络是一种无现实限制的全天候信息交互网络,社交网络的固定信息推荐是保证网络安全,评估网络用户信任度和实现隐私保护的基础。社交网络的固定信息具有多主体性和随机性特点,难以实现有效的信息推荐。传统的社交网络固定信息推荐算法采用主体协商的云信任数据推荐,对社交网络的非常态固定信息推荐的主观性较大,性能不好。提出一种基于模糊判定的社交网络中固定信息推荐算法。构建社交网络固定信息特征提取模型,采用网格划分技术对路由结点所在的平面区域进行特征划分,对固定信息进行模糊跟踪判定,得到社交网络中固定信息自适应跟踪概率分布,实现固定信息推荐算法改进。仿真实验表明,该算法能有效提高社交网络中固定信息推荐准确投递率。对节点缓存依赖性较弱,网络开销比较稳定,性能优越。 相似文献
4.
对P2P网络中的搜索算法进行分析,重点对广度优先搜索做了深入的研究和探讨,在广度优先搜索（BFS）机制的基础上,将智能搜索技术应用于P2P网络资源搜索中,得到了一种基于智能广度优先搜索算法的思路。对BFS算法进行了改进,得出了智能BFS（I-BFS）算法框架,最后对I-BFS进行仿真实验。实验结果表明：智能广度优先搜索算法和广度优先算法相比,避免了向所有接点发送,减少了网络中的路由消息,降低了网络的负载,提高了资源搜索的成功率。 相似文献
5.
提出了基于匿名区域优化位置隐私保护方法,通过预测的时长请求为用户计算出最优的匿名时间且划出最优的匿名时刻。本文所定义的概率位置指的是用户在一个位置出现的概率。算法主要考虑了用户的移动速度和方向,预测出用户的位置,然后推出用户的可能匿名区域,且给出最优时间。仿真实验结果表明,本文提出的请求位置隐私保护算法能够有效保护用户位置隐私信息。 相似文献
6.
7.
为了克服传统分簇路由协议中无法有效缓解"热区"和数据传输可靠性不高的问题,设计一种基于并行SOM和自适应禁忌优化算法的负载均衡路由协议。首先,将整个网络区域分为若干子区域,在每个子区域中自适应的根据节点与基站的距离确定分簇数目,采用并行SOM并行对网络区域进行分簇,同时根据能量和位置因素选举簇头;然后,以最小化各簇头到基站的最小跳数为目标,采用改进的禁忌优化算法来寻找各簇头到达基站的最优解和次优解,构成多条冗余路由,以增强数据传输的可靠性,最后,对基于改进禁忌优化算法的最小跳数路由协议进行了设计和描述。仿真实验表明:文中方法能有效地提高网络生命周期和提高数据传输的可靠性,具有很好的负载均衡能力,是一种适用于WSN的有效分簇路由算法。 相似文献
8.
机会网络的混合路由优化设计可以有效降低冗余开销,提高数据传递成功率。传统方法采用链路代价评估和能量节省延迟容忍算法实现机会网络的路由设计,当在移动自组织网络中出现节点稀疏化调度下链路具有不对称性,降低了路由分配质量。提出一种基于改进的OLSRv2算法的链路不对称性预测控制机会网络混合路由优化算法,定义机会网络中混合置信因子概念,研究路由优化检验统计量的确定和判别系统的设计,通过OLSRv2算法引入了概率路由,在当前连通域的路由信息进行地址压缩得到最优传送概率值。仿真实验表明,采用该算法设计的机会网络路由进行网络通信,得到较小的控制开销,提高通信成功率,网络负载大幅降低。 相似文献
9.
移动自组网络通信过程中,通信节点会根据通信区域的不同发生变化,各个节点之间位置也发生相对移动。造成通信不稳定。为了避免上述传统算法的缺陷,提出基于考虑相对位置变换误差的自组网络路由模型。对移动的通信节点进行模糊性距离分区处理,对不同区域移动通信过程进行分层约束,在建立不同层之间的通信联系,对不同模糊区域内的移动节点进行通信优化处理。实验结果表明,利用该算法进行节点移动过程中的通信路由协议优化处理,能够极大地提高通信的效率,降低通信的误码率,从而满足实际移动自组网络的通信需求。 相似文献
10.
11.
Marjorie Armstrong-Stassen Margaret Landstrom Ramona Lumpkin 《The Information Society》1998,14(2):153-164
This study examined how students who had no prior experience with videoconferencing would react to the use of videoconferencing as an instructional medium. Students enrolled in seven different courses completed a questionnaire at the beginning of the semester and again at the end of the semester. Students at the origination and remote sites did not differ in their reactions toward videoconferencing but there was a significant difference for gender. Women reacted less favorably to videoconferencing. Compared to the beginning of the semester, students reported significantly less positive attitudes toward taking a course through videoconferencing at the end of the semester. There were no significant differences in students' attitudes toward videoconferencing across courses at the beginning of the semester but there were significant differences across the courses at the end of the semester. The results suggest the need for better preparation for both students and instructors. 相似文献
12.
A joint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology his co-workers from Norway US Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells suggesting that China's projected climate warming could decrease the pest's numbers. The study was published in Proceedings of the National Academy of Sciences on September .…… 《中国科学院院刊(英文版)》2008,22(1):6-7
Ajoint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology and his co-workers from Norway, US and Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells, suggesting that China＇s projected climate warming could decrease the pest＇s numbers. The study was published in Proceedings of theNational Academy of Sciences on 17 September, 2007. 相似文献
13.
Caroline Haythornthwaite 《The Information Society》2001,17(3):211-226
A computer-mediated group is a complex entity whose members exchange many types of information via multiple means of communication in pursuit of goals specific to their environment. Over time, they coordinate technical features of media with locally enacted use to achieve a viable working arrangement. To explore this complex interaction, a case study is presented of the social networks of interactions and media use among members of a class of computer-supported distance learners. Results show how group structures associated with project teams dominated who communicated with whom, about what, and via which media over the term, and how media came to occupy their own communication niches: Webboard for diffuse class-wide communication; Internet Relay Chat more to named others but still for general communication across the class; and e-mail primarily for intrateam communication. Face-to-face interaction, occurring only during a short on-campus session, appears to have had a catalytic effect on social and emotional exchanges. Results suggest the need to structure exchanges to balance class-wide sharing of ideas with subgroup interactions that facilitate project completion, and to provide media that support these two modes of interaction. 相似文献
14.
Electronic data interchange (EDI) provides means for interorganizational communication, creates network externalities, requires an advanced information technology (IT) infrastructure, and relies on standards. In the diffusion of such innovations, institutional involvement is imperative. Such institutions contain governmental agencies, national and global standardization organizations, local government, and nonprofit private organizations like industry associations. The last type of organizations we call intermediating institutions. They intermediate or coordinate ("inscribe") the activities of a group of would-be adopters. Unfortunately, little is known of how these organizations shape the EDI diffusion trajectory. In this article we examine one specific type of intermediating organizations?industry associations?and how they advanced the EDI diffusion process in the grocery sectors of Hong Kong, Denmark and Finland. We identify six institutional measures, placed into a matrix formed by the mode of involvement (influence vs. regulation) and the type of diffusion force (supply push vs. demand pull), that can be mobilized to further the EDI diffusion. Industry associations were found to be active users of all these measures to varying degrees. Their role was critical especially in knowledge building, knowledge deployment, and standard setting. Furthermore, institutional involvement varied due to policy and cultural contingencies and power dependencies. 相似文献
15.
Puay Tang 《The Information Society》1998,14(1):19-31
The increasing prospects of digital piracy has prompted the perceived need by electronic publishers to adopt technical systems of protection, and governments to reform their copyright laws. This article is a preliminary study of the management of intellectual property by electronic publishers, defined as those involved in the production of online databases, and CD-ROMs. It focuses on three main issues: (1) how electronic publishers view the increasing threat of piracy; (2) the methods of protection employed to protect intellectual property in digital format; and (3) the importance of technological protection of intellectual property in electronic publications. The analysis is based on a sample of 23 UK electronic publishers. The interviews revealed an interesting assortment of protection methods and did not show that technological protection was a preferred way. Instead, the means of protection, in addition to copyright law, comprised niche markets, pricing, trust, bad publicity, and nontechnical and technical means. 相似文献
16.
Milton Mueller 《The Information Society》2001,17(3):151-163
Long-standing conflict between domain name registrants and trademark holders prompted the Internet Corporation for Assigned Names and Numbers (ICANN) to create a global, mandatory arbitration procedure known as the Uniform Dispute Resolution Policy (UDRP). The UDRP has been used in 2166 cases involving 3938 domain names as of 1 November 2000. The policy gives the initiator of a complaint, generally a trademark holder, the right to choose which ICANN-accredited dispute resolution service provider (RSP) will handle the case. During the preparation of the UDRP,some feared that complainant selection would lead to "forum shopping" that might bias the results. This article performs a statistical assessment of the forum-shopping thesis and finds support for it. There are statistically significant differences in the various RSPs' propensity to take away names from defendants; there are also major differences in the number of cases brought to each RSP. RSPs who take away names have the larger share of cases. The study examines other variables that might explain differences in market share, such as price, the plaintiff's nationality, or the time taken to decide a case. It finds that nationality and time also are correlated with market share. The study concludes that shopping for a favorable outcome is an important factor in the UDRP. 相似文献
17.
Prof. Raymond C.K. Chen a neuropsychologist with the CAS Institute of Psychology has made novel progress in his studies of schizophrenia. His work has been reported by a recent issue of Behavioural Neurology.…… 《中国科学院院刊(英文版)》2008,22(1):15-15
Prof. Raymond C.K. Chen, a neuropsychologist with the CAS Institute of Psychology, has made novel progress in his studies of schizophrenia. His work has been reported by a recent issue of Behavioural Neurology. 相似文献
18.
《中国科学院院刊(英文版)》2014,(3)
<正>In Xishuangbanna,one of China’s most biodiverse regions,landscape has changed dramatically during the past three decades due to the conversion of tropical rainforest to rubber plantations.In steep areas,terraces are often constructed before planting rubber trees,which causes two important changes in the soil:the destabilization of soil in the bench terraces and the increased vulnerability of unvegetated riser faces to erosion.Few studies have documented the nature and intensity of erosion on bench terraces.Prof.LIU Wenjie and his colleagues from the Xishuangbanna Tropical Botanical Garden(XTBG)conducted a study in Menglun County(21°5′39″N,101°15′55″E),Xishuangbanna to evaluate the influence 相似文献
19.
Chinese Scientists Use Earth Observation Technologies to Study and Protect Wild Camels 总被引：1，自引：0，他引：1
《中国科学院院刊(英文版)》2014,(3):267-268
<正>Chinese scientists plan to apply Earth Observation technologies to protect the critically endangered wild camels(Camelus ferus).With the help of remote sensing,satellite positioning,geographical information system and wireless sensors networks,they will be able to access the distribution and population of the wild camels and protect their habitats.The project will be carried out by the International Research Center for Wild Camel Conservation,which was jointly established earlier this year by the Institute of Remote Sensing and Digital Earth(RADI)of the Chinese 相似文献
20.
WANG Sijia 《中国科学院院刊(英文版)》2014,(2):192-194
<正>The Paul Gerson Unna Research Group on Dermatogenomics was founded in October 2012 at the Partner Institute for Computational Biology.The ultimate goal of the group is to understand the biology of skin and skin appendages. 相似文献