基于域加权词频法的XML文档级检索实现与评价

利用BM25F模型,通过实验,在INEX 04数据集的基础上,实现了对多个域(元素)词频进行加权的XML文档级检索。XML文档结构的确蕴含了一定的语义信息。利用这些语义信息,可以提高检索性能。表2。图1。参考文献16。     

种子概念方法及其在基于文本的本体学习中的应用

介绍基于文本的本体学习及其层次,分析本体学习中术语获取的主要方法。针对术语获取中存在的问题,在术语形成的经济规律基础上,引入种子概念方法,并利用统计和规则两种方法抽取与种子概念相关的领域术语;证明种子概念方法是一种有效获取领域术语的方法。实验证明少量种子词可以获取大量领域术语,为本体构建提供基础和框架。     

劳动者无条件预告解除权之畸形现状--对我国《劳动法》第31条规定之反思

我国《劳动法》第31条赋予单方授予劳动者以无条件的预告解除权,其中暗含了严重的法理悖论。“提前30日书面通知”仅是劳动者主观履行的程序,而非其单方预告解除权客观所需满足的条件。《劳动法》第31条由于授权不均及将无条件的单方解除权泛化于一切类型的劳动合同,以及单一僵化的预告期规定模式造成了法理悖论及诸多实体法难题。应借鉴国外先进立法例,对简陋立法下畸形发展的劳动者预告解除权作出纠正。     

五个同科电子形成的光谱项的推求

提出了五个同科电子体系在L-S耦合中确定光谱项的“删除法则”,并加以证明,利用“删除法则”可以很方便地确定五个同科电子所形成的光谱项.     

高校党的先进性建设长效机制探析

高校是培养和造就社会主义事业建设者和接班人的重要场所。按照新形势下党的建设的新要求，在高校积极探索和建立先进性建设的长效机制，具有重要的现实意义。本文基于党的先进性、共产党员先进性的辩证统一关系，从操作层面和内容框架两个方面分析了高校党的先进性建设长效机制。     

Optimization of some factors affecting the performance of query expansion

This paper examines the factors affecting the performance of global query expansion based on term co-occurrence data and suggests a way to maximize the retrieval effectiveness. Major parameters to be optimized through experiments are term similarity measure and the weighting scheme of additional terms. The evaluation of four similarity measures tested in query expansion reveal that mutual information and Yule's Y, which emphasize low frequency terms, achieve better performance than cosine and Jaccard coefficients that have the reverse tendency. In the evaluation of three weighting schemes, similarity weight performs well only with short queries, whereas fixed weights of approximately 0.5 and similarity rank weights were effective with queries of any length. Furthermore, the optimal similarity rank weight achieving the best overall performance seems to be the least affected by test collections and the number of additional terms. For the efficiency of retrieval, the number of additional terms needs not exceed 70 in our test collections, but the optimal number may vary according to the characteristics of the similarity measure employed.     

Prostate specific antigen in patients of benign prostate hypertrophy and carcinoma prostate

Prostate Specific Antigen (PSA) has emerged as the most applicable and important tumor marker for carcinoma prostate. In the present study PSA was determined in serum of healthy subjects, patients of benign prostate hypertrophy (BPH) and Carcinoma Prostate (Ca−P) to evaluate its diagnostic efficiency in day to day management of prostate cancer patients and in differentiating patients of early prostate cancer from those with BPH. Receiver operating characteristic curve (ROC) revealed 2 ng/ml and 10 ng/ml cut off serum PSA level for BPH and untreated carcinoma prostate patients (Ca−P). An extremely significant increase (P<0.0001) was observed in mean PSA concentration in BPH patients and adenocarcinoma prostate patients when compared to healthy males. Clinical relevance of PSA was highlighted by a case study of cancer patient prior to any therapy till death.     

浅析冲压机械及周边关联用语英汉对照

随着电气工程的突飞猛进,我国与各个国家的交往日益密切,电气工程专业对译员的综合能力的要求也有很大的提高。忠实、准确是对所有翻译人员的要求,所以需要努力树立电气工程翻译人员的形象。本文通过来自于实践的一些翻译实例,分析了电气工程英语翻译中的一些要点和技巧,阐述了技术类翻译对译者和译文的基本要求。     

The effects of a calf pump device on second half performance of a simulated soccer match in competitive youth players

During soccer matches, performance decrements have been reported that relate to both physical abilities and technical skills. To investigate the effects of low-frequency electrical stimulation LFES (VeinoplusSport®, Ad Rem Technology, France) administered during half-time recovery on performance alterations during the second half. Twenty-two highly trained young players undertook a soccer-match simulation (SAFT⁹⁰). During half-time, they were randomly assigned to LFES group or Placebo group. Each half was split into 3 bouts of 12 minutes. Following each bout, maximal strike speed (MSS), sprint test (ST), maximal sprint accelerations (MA) and metabolic power (MP) were determined in both groups. Arterial (AF) and venous flows (VF) were measured at rest and at the end of half-time. LEFS group exhibited beneficial effects on performance compared to the Placebo group with a likely effect for MSS, ST, MA, and a possible effect for MP. AF and VF increased statistically more in LEFS group compared to Placebo group. The use of specific calf-pump LFES during half-time of a youth simulated soccer match attenuated the decrease in performance during the second half compared to Placebo group. This effect is most marked at the beginning of the second half with regards to explosive parameters.     

高等教育自学考试教材《教育评估和督导》评析——兼论自学考试中的教与学

高等教育自学考试中的教与学是两个基点,而教材是基本依据。目前指定的《教育评估和督导〉存在一些问题,影响了教育的效果与质量。如何解决这些问题呢？（1）根据短线自考生的特点选择教材;（2）对现有教材进行适当修订;（3）采用合适的教学方法与策略。