Mining user interests over active topics on social networks

Inferring users’ interests from their activities on social networks has been an emerging research topic in the recent years. Most existing approaches heavily rely on the explicit contributions (posts) of a user and overlook users’ implicit interests, i.e., those potential user interests that the user did not explicitly mention but might have interest in. Given a set of active topics present in a social network in a specified time interval, our goal is to build an interest profile for a user over these topics by considering both explicit and implicit interests of the user. The reason for this is that the interests of free-riders and cold start users who constitute a large majority of social network users, cannot be directly identified from their explicit contributions to the social network. Specifically, to infer users’ implicit interests, we propose a graph-based link prediction schema that operates over a representation model consisting of three types of information: user explicit contributions to topics, relationships between users, and the relatedness between topics. Through extensive experiments on different variants of our representation model and considering both homogeneous and heterogeneous link prediction, we investigate how topic relatedness and users’ homophily relation impact the quality of inferring users’ implicit interests. Comparison with state-of-the-art baselines on a real-world Twitter dataset demonstrates the effectiveness of our model in inferring users’ interests in terms of perplexity and in the context of retweet prediction application. Moreover, we further show that the impact of our work is especially meaningful when considered in case of free-riders and cold start users.     

非零Gauss曲率Bonnet曲面的存在性及其相关性质

研究关于Bonnet曲面的两个问题。第一，通过研究Bonnet曲面的平均曲率所满足的常微分方程证明Gauss曲率不恒为零的Bonnet曲面一定存在。第二，证明若两张Bonnet曲面之间存在一个保主曲率且保定向的共形映射，则有以下两种情形：如果两曲面的Gauss曲率零点孤立，则该共形映射必为等距；如果两曲面的Gauss曲率恒为零，则该共形映射为相似变换。     

凤阳山、百山祖、九龙山、大洋山凤蝶科蝶类调查研究

通过5年多时间,对浙江丽水的凤阳山、九龙山、百山祖和大洋山的凤蝶科(Papilionidae)蝶类进行调查研究,共发现凤蝶科的蝶类25种,其中凤阳山17种,百山祖17种,九龙山24种,大洋山20种.结合四地区凤蝶科蝶类种类分布及自然生态环境,研究和讨论四地区凤蝶科蝶类相似程度及原因.     

基于商标和专利数据的潜在研发商业化机会识别

[目的/意义]研发商业化机会(R&BD)是指通过整合市场和创新来开发技术以创造有价值技术的过程,基于商标和专利的不同映射情景识别不同的R&BD机会并制定不同的策略,不仅使商标这一重要的知识产权战略得以充分应用,而且可以为不同情景下的R&BD机会制定具有针对性的策略。[方法/过程]为了降低技术商业化的失败率,提出一个以商标和专利数据为依据,利用文本挖掘技术识别商标和专利空白,使用文本相似度算法和逆映射寻找商标和专利的对应关系,结合情景分析法分情景识别潜在R&BD机会的研究框架。以远程医疗领域商标和专利作为分析对象,预测该领域的潜在R&BD机会。[结果/结论]实证结果表明:所选技术领域共发现29个潜在的商标空白点,通过商标和专利的逆映射确定了11个商标空白点与现有专利对应,同时确定了24个具有商业化潜力的现有专利技术,通过LDA主题模型以及人工分析进行主题概括,可以发现该情景下远程医疗领域潜在的R&BD机会主要集中在4个方面;确定了7个商标空白点与3个专利空白点对应,该情景下归纳出3个潜在R&BD机会;确定了11个商标空白点与现有专利和专利空白点均无对应,该情景在现阶段无数据支撑,无法做具体研究。     

教育教学中相似规律的探索

自然界和人类社会普遍存在的相似现象启发我们对教育教学中相似规律进行探索与追寻。相似理论为教育教学中相似规律的探索和研究提供了理论依据。以形象思维为突破口、以我国传统经典智慧为支撑、以规律为中心对教育教学中相似规律的探索和尝试,包括相似教学模式、相似语言系统以及相似诱导训练模式。     

基于多层特征的字符串相似度计算模型

针对计算字符串相似度传统方法的不足之处,提出以相似元作为字符串的基本处理单元,综合考虑相似元的字面、语义及统计关联等多层特征的字符串相似度计算方法。对常规计算方法中存在的,由相似元排序引起的相似元位置信息丢失问题进行了修正。实验结果表明该算法的有效性,并且对句子间、段落间的相似度计算有启发意义。     

基于聚类中心初始化的文本分类高效算法

将前期工作进行了改进并将训练集各簇中语义相似度大的文档进行合并,减少了训练集容量,实验表明该算法大大提高了KNN算法的效率。     

A case analysis of semantic technologies for R&D intermediation information management

It is evident that companies and research centres can find a myriad of instruments to fund their R&D (Research & Development) activities. Due to the dynamics of the information management in these circumstances there is a need for intermediary businesses intervention. Consequently, intermediary companies are thus involved in a complex process that needs to be managed and controlled. Within this scenario an Information Technology (IT) platform, named RDi-Advise, was developed by EgeoIT using semantic technologies to support R&D process decisions. This case analysis describes the development and implementation of the platform including the lessons learned during the activity period.     

An asynchronous collaborative search system for online video search

There are a number of multimedia tasks and environments that can be collaborative in nature and involve contributions from more than one individual. Examples of such tasks include organising photographs or videos from multiple people from a large event, students working together to complete a class project, or artists and/or animators working on a production. Despite this, current state of the art applications that have been created to assist in multimedia search and organisation focus on a single user searching alone and do not take into consideration the collaborative nature of a large number of multimedia tasks. The limited work in collaborative search for multimedia applications has concentrated mostly on synchronous, and quite often co-located, collaboration between persons. However, these collaborative scenarios are not always practical or feasible. In order to overcome these shortcomings we have created an innovative system for online video search, which provides mechanisms for groups of users to collaborate both asynchronously and remotely on video search tasks. In order to evaluate our system an user evaluation was conducted. This evaluation simulated multiple conditions and scenarios for collaboration, varying on awareness, division of labour, sense making and persistence. The outcome of this evaluation demonstrates the benefit and usability of our system for asynchronous and remote collaboration between users. In addition the results of this evaluation provide a comparison between implicit and explicit collaboration in the same search system.     

Conceptual navigation in knowledge management environments using NavCon

This article presents conceptual navigation and NavCon, an architecture that implements this navigation in World Wide Web pages. NavCon architecture makes use of ontology as metadata to contextualize user search for information. Based on ontologies, NavCon automatically inserts conceptual links in Web pages. By using these links, the user may navigate in a graph representing ontology concepts and their relationships. By browsing this graph, it is possible to reach documents associated with the user desired ontology concept. This Web navigation supported by ontology concepts we call conceptual navigation. Conceptual navigation is a technique to browse Web sites within a context. The context filters relevant retrieved information. The context also drives user navigation through paths that meet his needs. A company may implement conceptual navigation to improve user search for information in a knowledge management environment. We suggest that the use of an ontology to conduct navigation in an Intranet may help the user to have a better understanding about the knowledge structure of the company.