SINA: Semantic interpretation of user queries for question answering on interlinked data

The architectural choices underlying Linked Data have led to a compendium of data sources which contain both duplicated and fragmented information on a large number of domains. One way to enable non-experts users to access this data compendium is to provide keyword search frameworks that can capitalize on the inherent characteristics of Linked Data. Developing such systems is challenging for three main reasons. First, resources across different datasets or even within the same dataset can be homonyms. Second, different datasets employ heterogeneous schemas and each one may only contain a part of the answer for a certain user query. Finally, constructing a federated formal query from keywords across different datasets requires exploiting links between the different datasets on both the schema and instance levels. We present Sina, a scalable keyword search system that can answer user queries by transforming user-supplied keywords or natural-languages queries into conjunctive SPARQL queries over a set of interlinked data sources. Sina uses a hidden Markov model to determine the most suitable resources for a user-supplied query from different datasets. Moreover, our framework is able to construct federated queries by using the disambiguated resources and leveraging the link structure underlying the datasets to query. We evaluate Sina over three different datasets. We can answer 25 queries from the QALD-1 correctly. Moreover, we perform as well as the best question answering system from the QALD-3 competition by answering 32 questions correctly while also being able to answer queries on distributed sources. We study the runtime of SINA in its mono-core and parallel implementations and draw preliminary conclusions on the scalability of keyword search on Linked Data.     

单片机控制泄漏电流测试仪

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厌氧反应除硫酸盐的新工艺

对目前消除硫酸盐对厌氧反应影响的几种方法进行了归纳评价 ,并提出了硫酸盐还原 微电解除硫化物 厌氧反应的新思路 ,从理论上分析了这种新工艺的特点 ,同时提出了存在的问题及对策。     

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介绍国内外聚氨酯轮胎的研究和应用进展,对我公司聚氨酯轮胎发展历程及性能进行了详细的回顾及分析,并展望了未来聚氨酯轮胎的发展趋势以及应用前景。     

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摘 要 甘肃中部地区在农村劳动力转移过程中出现了从未有过的“五化”（整体人口低能化、劳动者队 伍的老龄化、村庄凋敝化、公共管理弱化、男性鳏夫化）现象。通过对该现象进行深入分析,有针对性地 提出了大力提高农村人口素质,创新农地产权制度,大力发展民营企业,着力推进农村就业公共服务体系 建设,有序、较快推进农村城镇化等对策建议。     

带关键词检索的公钥加密方案

针对现有的带关键词检索的公钥加密(PEKS)方案中的大量对运算需要消耗较多时间,且都存在不能抵抗重放攻击的问题,在研究PEKS的基础上,提出一种高效的带关键词检索的公钥加密方案。与现有的PEKS方案相比,该方案保留了现有PEKS方案的优点,能有效地抵抗重放攻击。     

An effective 3-in-1 keyword search method over heterogeneous data sources

Conventional keyword search engines are restricted to a given data model and cannot easily adapt to unstructured, semi-structured or structured data. In this paper, we propose an efficient and adaptive keyword search method, called EASE, for indexing and querying large collections of heterogeneous data. To achieve high efficiency in processing keyword queries, we first model unstructured, semi-structured and structured data as graphs, and then summarize the graphs and construct graph indices instead of using traditional inverted indices. We propose an extended inverted index to facilitate keyword-based search, and present a novel ranking mechanism for enhancing search effectiveness. We have conducted an extensive experimental study using real datasets, and the results show that EASE achieves both high search efficiency and high accuracy, and outperforms the existing approaches significantly.     

一种面向主题的关键词查询扩展方法

提出一种基于局部统计和语义扩展相结合,面向主题的关键词查询扩展方法。该方法通过对给定主题的初始关键词搜索反馈网页进行分析,采用TF*PSF语义加权方法计算主题候选词的权重来进一步筛选主题关键词。在此基础上,设计了面向Web的主题关键词迭代查询扩展算法,采用主题关键词的组合查询策略,迭代扩展出主题的关键词集合。实验证明该方法是有效的。