基于Agent的数字图书馆个性化信息推送服务模型研究

在通过对Agent技术含义与特性分析的基础上,本文探讨了个性化信息推送服务的形式以及在Agent技术下的各种个性化信息推送服务的模式,详细分析了基于Agent技术的个性化信息推送服务的工作原理。     

论图书馆的个性化服务

从人文素质教育和图书馆个性化服务的内涵谈起。从不同的角度对以图书馆个性化服务的方式促进大学生人文素质教育的途径进行探讨．并对将二者横向贯通进行研究的前景予以展望。     

分析师利益与投资建议的信息含量

 内容提要:本文分析了证券分析师的利益和我国证券分析师投资建议的信息含量。本文发现,证券分析师投资建议大多为“买入”或“中性”建议,而“卖出”建议却很少。通过对投资建议发布日附近股票超额回报率和超常交易量的研究,本文发现“买入”、“卖出”建议分别会引起股价的永久性上涨和下跌,而“中性”建议不会对股价产生显著影响。此外,被建议“买入”和“卖出”的股票的交易量也会明显地增加,特别是在建议发布的当日。这些现象说明,投资者认为分析师的建议包含了有价值的信息,因而相应地调整了对未来收益的预期以及当前最优的持股数量。股票交易的活跃给证券公司带来了佣金收入,作为对他们向市场传递有价值信息的回报。     

身体缺场的个性化消费研究

通过网络平台,人们可以不受时空限制,在身体缺场的情况下进行消费。与传统线下消费相比,网络消费者的消费需求彰显出符合自身特点的个性化趋势。时空分离的缺场空间使得人们在实施某些社会行为时的心理产生了变化,由此,消费内容、消费选择及消费结构也必然发生相应的转变。身体缺场的个性化消费存在一些可能影响正常消费秩序的问题,因此,需要有针对性地建立完善的网络个性化消费监管办法和信息共享平台,健全有关法律制度体系,并加强相关技术创新。     

内容型虚拟社区中的用户互动和融入_身份认同的中介效应

目的/意义随着网络信息技术的迅猛发展,娱乐产品虚拟品牌社区的发展愈演愈烈。娱乐产品虚拟品牌社区能够让成员在社区中频繁地互动,从而增加成员对社区的价值认同,激发情感共鸣,并激发成员间的推荐意愿,实现商业价值。设计/方法基于379份问卷,探究了娱乐产品虚拟品牌社区成员互动、价值认同与推荐意愿之间的影响。结论/发现研究得出娱乐产品虚拟品牌社区成员互动能促进心理认同和行为认同,心理认同和行为认同能促进成员间的推荐意愿,行为认同在心理认同与推荐意愿间具有部分中介效应,对娱乐产品虚拟品牌社区的研究做出了贡献。     

A comparison of subgroup identification methods in clinical drug development: Simulation study and regulatory considerations

With advancement of technologies such as genomic sequencing, predictive biomarkers have become a useful tool for the development of personalized medicine. Predictive biomarkers can be used to select subsets of patients, which are most likely to benefit from a treatment. A number of approaches for subgroup identification were proposed over the last years. Although overviews of subgroup identification methods are available, systematic comparisons of their performance in simulation studies are rare. Interaction trees (IT), model‐based recursive partitioning, subgroup identification based on differential effect, simultaneous threshold interaction modeling algorithm (STIMA), and adaptive refinement by directed peeling were proposed for subgroup identification. We compared these methods in a simulation study using a structured approach. In order to identify a target population for subsequent trials, a selection of the identified subgroups is needed. Therefore, we propose a subgroup criterion leading to a target subgroup consisting of the identified subgroups with an estimated treatment difference no less than a pre‐specified threshold. In our simulation study, we evaluated these methods by considering measures for binary classification, like sensitivity and specificity. In settings with large effects or huge sample sizes, most methods perform well. For more realistic settings in drug development involving data from a single trial only, however, none of the methods seems suitable for selecting a target population. Using the subgroup criterion as alternative to the proposed pruning procedures, STIMA and IT can improve their performance in some settings. The methods and the subgroup criterion are illustrated by an application in amyotrophic lateral sclerosis.     

A Mentoring Opportunity: A Joint Effort in Writing Letters of Recommendation

Integrity in writing letters of recommendation is important to academic research because it is an influential criterion used pervasively in peer review. While research in the integrity of recommendation letters has concentrated on contents of the letter, bias, and reliability, few have questioned the process of letter writing. Here, I argue that letter writing should be a joint opportunity between mentor/supervisor/advisor and trainee. It results in more compelling letters, may prevent errors and the use of biased language, and serves as an excellent mentoring opportunity promoting self-reflection.     

基于h指数的专家引荐分析法与实例分析

引荐分析法(CRA)通过分析高影响力作者的施引列表来寻找该作者眼中的学界同行,通过对同行h指数的分析,可以揭示引荐者本身的学术地位.文章通过对中国物理类国家重点实验的引荐分析,验证了其引荐水平与其领域研究地位一致.     

基于消费性格的新商品推荐方法

电子商务推荐虽然在促进电子商务发展过程中起到重要作用,但面临新商品推荐问题,新商品推荐问题的症结在于缺乏消费者与新商品之间的联系。从消费心理学视角,根据消费心理决定消费行为这一基本原理,以消费性格理论为指导,以贝叶斯网络为工具,以消费者的实际购物数据为基础,提出基于消费者购物记录分析其消费性格、基于消费者消费性格进行新商品推荐的方法,以消费心理为纽带建立消费者与新商品之间的联系。研究结果表明,该方法在统计学意义上具有可行性、合理性和一般性,即可以从消费者的购物记录中分析出其消费性格,能够据此判定某一新商品是否符合其消费性格。消费性格的引入把电子商务推荐中消费者偏好研究深入到消费心理层面,为发展出新的基于消费者消费心理的推荐方法提供借鉴。     

伦理学与纳米制药:新药的价值敏感设计

尽管纳米药物的应用正在进一步发展并已经走向市场,但迄今为止,纳米制药仍然被视为一项新兴技术,它的概念并不明了。纳米制药也可以解释为一种会聚技术,它结合多种技术特征,范围从纳米技术波及到医学和信息通信技术。它的特征是否会引起新的伦理问题,或者这些相关纳米制药的伦理问题仅仅是基础领域现存问题的延伸至今仍在争论之中。我们认为,不管关联的伦理问题新奇还是技术进步引致的发展,都影响纳米制药领域的利益相关者发挥这样的作用,即要求以不同的方式负责任地创新。关联纳米制药的特有特征和会聚技术引进的特征在要求以不同方式负责的利益相关者中引起角色转换。我们提出,价值敏感设计是利益相关者在新纳米药物开发的早期阶段负责任地参与解决道德问题的一个适宜框架。