一种改进人工势场法的多机器人局部避碰规划方法     

万超  杨宜民 《科技广场》2011,(1):35-37

本文针对多移动机器人局部路径规划问题,提出一种基于改进的人工势场算法的策略。当多个机器人在安全的距离范围内相遇时,通过利用机器人之间产生的优先级退避策略走出对方视野,从而避免彼此碰撞、死锁。仿真结果表明此方法是有效的。  相似文献   

基于用户属性—关系相似度的好友推荐模型研究     

余以胜  陈咏晖 《情报理论与实践》2020,43(2):137-142,163

[目的/意义]挖掘潜在好友关系并进行精准的好友推荐服务,已成为社交网络领域研究的热点,基于用户属性-关系相似度的好友推荐模型研究旨在增强用户忠诚度以及在线社区活跃度,提升社区的信息服务准确性和效率。[方法/过程]通过融合用户链接关系与属性特征,提出用户属性-关系相似评价体系;采用因子分析法,计算得出各项目权重以及综合得分;据此构建社交网络相似度矩阵,基于派系划分方法,对用户进行划分分区,最终实现好友推荐服务。[结果/结论]实验结果表明,运用派系划分的基于用户属性-关系推荐模型在推荐列表长度受限情况下的整体表现较优,有效提高推荐精准度。  相似文献   

基于多源用户标签的跨域兴趣融合模型研究          下载免费PDF全文

张彬  徐建民  吴树芳 《情报科学》2020,38(4):147-152

【目的/意义】通过对大数据环境下的多源用户兴趣特征有效融合,缓解个性化推荐中用户兴趣偏好数据的稀疏性和准确性问题。【方法/过程】考虑到多域的数据权威度、内容质量及体系结构的差异化较为明显,提出了基于多源用户标签的跨域兴趣融合模型,首先把多个域中的用户兴趣进行标签化处理,然后利用跨域用户识别和标签权重归一方法得到多个域的用户实体-标签矩阵,最后使用域权重影响系数对标签进行融合,构造具有复合权重的用户兴趣标签集。【结果/结论】使用5个来源数据域进行实验与分析,融合模型能够有效提高标签用户覆盖效果,在查全率不断提高的情况,融合域能够保持较高的标签用户查准率,有效提高用户兴趣特征的描绘效果。  相似文献   

What do they want? Millennials and role of libraries in Pakistan     

Saira Hanif Soroya  Kanwal Ameen 《The Journal of Academic Librarianship》2018,44(2):248-255

The present study is aimed at determining the future role of libraries in Pakistan as perceived by the Millennials (people born during the 1980's and late 1990's) considering the current ongoing digital development. The quantitative research design, based on survey has been used for the study. The population consisted of students from large and medium sized general universities of Lahore, Pakistan. Stratified purposive sampling technique was carried out to select the pool of the subjects e. A self-constructed and validated instrument was used to collect data. The collected data was analyzed using SPSS (16.0). The results revealed that Millennials want future libraries to allow easy access to a wide range of reading material in both print and digital form. They want to be able to round the clock access to electronic and print resources.  相似文献   

Bringing Content into the Picture: Proposing a Tri-Partite Model for Digital Preservation     

Heather Moulaison Sandy 《图书馆管理杂志》2018,58(1):1-17

Digital preservation is a complex field that is rapidly maturing and increasingly focusing on content as well as the human element of digital preservation. This conceptual article examines a number of digital preservation models meeting a variety of needs created by different communities. Given the guidance these models have afforded digital preservation, considering the present, and looking to the future, this article proposes a tri-partite model for thinking about digital preservation in an era of robust community involvement: the Digital Preservation Triad. The Triad focuses on 1) Management, including elements relating to documentation and human resources; 2) Technology; and 3) Content.  相似文献   

How Can the University Library Better Meet the Information Needs of Research Students? Experiences From Ulster University     

Geraldine Delaney 《New Review of Academic Librarianship》2018,24(1):63-89

This article investigates academic library needs of doctoral students. The study identifies PhD students' information literacy training needs and explores current levels of library engagement, barriers to use, and gaps in existing services. First-year PhD students at Ulster University (UU) were surveyed and interviews were undertaken with three students. Findings show that just over half the respondents start their research from the Library's e-journal interface or library databases and these resources are also their main research tools. Minimal use was made of social media or apps. Students' ability to correctly identify different source types within a reference did not match the confidence they expressed in their own abilities, and two thirds were not aware of basic e-book capabilities. However, over 90% of the respondents strongly agreed that the university library service was essential for their research. The article concludes with a number of recommendations on improving library services for PhD students.  相似文献   

Reverse Image Lookup: Assessing Digital Library Users and Reuses     

Michele Reilly  Santi Thompson 《Journal of Web Librarianship》2017,11(1):56-68

Reverse image lookup technology was used to assess the users and reuses of images from the Library of Congress' Teaching with Primary Resources digital collection. After selecting 44 images for the study, researchers used Google Reverse Image Lookup to generate a dataset of over 1,400 URLs. Drawing upon a coding rubric designed for a previous study on the ultimate uses of digital library materials, researchers coded the data to identify who uses these images and for what purposes. They found that the most popular type of user was “personal,” which aligns with previous work and indicates that a pattern is emerging between ultimate use and the personal user type. Additionally, the study's results indicate that social media and popular culture research outnumbered any other type of reuse. This article introduces reverse image lookup as a viable and approachable tool for digital library assessment, and discusses its implications for assessment and content selection.  相似文献   

Different Strokes for Different Folks: Presenting EAD in Three UK Online Catalogues     

《Journal Of Archival Organization》2013,11(2-3):183-206

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新建本科院校图书馆学科服务的现状、瓶颈与对策研究     

梁光德  许军林胡瑛 《新世纪图书馆》2013,73(10):32-39

学科服务是高校图书馆行之有效的创新服务模式,也是推动图书馆服务转型的重要手段,然而,新建本科院校图书馆由于学科服务体系不健全、学科用户需求动力不足、学科馆员服务能力不强等因素的制约,造成学科服务实践成效不显著.突破图书馆学科服务的瓶颈应加强学科服务顶层设计,重组图书馆业务流程;创新学科服务模式,实施“按需分级”服务策略;融入教学科研过程,激发用户潜在需求;凝练学科馆员团队,提高学科服务整体效能.  相似文献   

E-Mail Reference     

《The Reference Librarian》2013,54(74):55-73

Summary

This article begins by summarizing national findings of e-mail reference services in academic and public libraries. It next describes types of e-mail reference services as well as commonalities, differences, appearance of the question form, audience, and turnaround time for selected Colorado libraries. The article then focuses on giving a detailed overview and analysis of two years of Colorado State University's e-mail reference experiences. The number, type of question, who/where the questions come from, and to whom the questions are sent are examined. The unexpected uses of the service are identified. Lastly, broader issues to do with e-mail reference services are discussed. This article is based on a presentation given at the Internet Librarian2000 conference.  相似文献