共查询到20条相似文献，搜索用时 78 毫秒
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提出了一种基于用户浏览历史的用户兴趣提取模型,它隐式地收集用户信息用于个性化搜索中,即是通过对用户兴趣度的定义,在用户的浏览历史中得到一组代表用户兴趣的网页,并设计一个聚类算法,对这组代表用户兴趣的网页进行聚类操作,从而得到能代表此用户兴趣类别的词,即用户的兴趣。 相似文献
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用户教育是图书馆的核心功能之一,高校复合型图书馆深化用户教育,要利用网络环境,改革用户教育内容和模式;整合校内信息资源,共同开展用户教育,提高用户教育效率;开展深层次教育培训,拓宽用户教育渠道,由此深化图书馆的用户教育工作。 相似文献
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对信息用户的研究是信息服务研究的重点,信息用户可以简单的分为个体用户和群体用户,一般来说,图书馆是为群体用户服务的,在影响群体用户信息需求的诸多因素中,用户的个体特征对群体用户的信息需求具有重要影响。 相似文献
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提出了一种多主从用户相互协作的认知共存网络系统模型.在该模型中,控制中心已知所有用户的位置并为每个主用户分配最近的从用户进行协作通信,控制中心通过从用户反馈的感知结果来获取频谱空洞信息并为从用户分配工作频段.主用户利用正交子信道接入基站.从用户利用网络中未用的频谱空洞采用放大前传机制为主用户转发数据.推导了在该模型下主用户的中断概率,并对主用户发送概率ps、主从用户间发射功率分配系数ξ和主从用户数对系统的影响进行了仿真.仿真结果表明,主从用户间平均分配发射功率在ξ=0.5且网络中主从用户数目相同时系统性能最优. 相似文献
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交互式信息服务模型强调人机交互过程中对用户动态的反映,注重用户认知因素和非认知因素的结合,旨在构建支持对用户自适应的用户模型。通过提出使用模糊集的方式,对在线用户进行建模,同时描述了基于这种用户模型进行用户行为在线跟踪和用户行为预测的方法,并介绍一个系统实现构成。 相似文献
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为了应对高级持续性威胁（APT）攻击造成的威胁,解决传统基于规则的分析方法对用户异常行为检测的误报与漏报问题,提高用户异常行为检测效果,通过采集用户行为日志生成用户操作行为矩阵,并通过模型定义方式对用户行为进行相似度分析。采用容忍度测算、突变测算、差值测算与峰值测算方法,分析与发现用户异常访问。基于用户画像的异常行为分析方法结合了用户操作行为特征及角色定义,利用用户行为日志历史信息勾勒出用户行为画像,使系统能准确、实时地判断用户行为异常,提高了对异常行为的实时检测与快速响应能力。 相似文献
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Shibboleth的目的是对用户进行统一的认证。通过用户所属的源站点对用户进行认证和授权,从而使得联盟中各个站点能够对用户进行认证和授权。它涉及4个方面的内容用户认证机制;用户资料的传递机制;用户真实性的鉴别;用户认证和授权信息的保密机制。这些,都属于信息安全领域的研究范畴。 相似文献
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韦相 《蒙自师范高等专科学校学报》2013,(2):40-42,63
Web挖掘的一个研究方向是发现用户对网页的兴趣.用户的浏览网页意味着用户对该网页上的某种概念感兴趣.文中提出基于隐马尔可夫模型,对用户访问网页的序列进行分析,发现用户感兴趣的概念,然后把蕴含用户感兴趣概念程度最大的网页推荐给用户.这种模式实质上是一种Web服务设计,给用户提供个性化的优质服务,提高网站的服务质量. 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
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唐芳 《读与写:教育教学刊》2008,5(6)
During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context. 相似文献