Báo cáo khoa học: "A Re-examination of Query Expansion Using Lexical Resources" pptx

... briefly re- view the studies of query expansion using axiomatic approaches in Section 3. We then present our study of using lexical resources, such as WordNet, for query expansion in Section 4, and ... the problem of query expansion using lexical resources with the recently proposed axiomatic approaches (Fang and Zhai, 2006). The major advantage of axiomatic ap- p...

Ngày tải lên: 17/03/2014, 02:20

... follows is an example of the incremental revision of a summary paragraph. The discussion at each step gives an indication of the character of information needed and the types of decisions made ... guard against the possibility of a choice causing unforeseen problems in later steps of the revision process. One way to avoid this problem is to keep a version of the text fo...

Ngày tải lên: 24/03/2014, 02:20

... text search query and the number of initial positive examples and the per- centage of it in the training data set. word No. of senses No. of instances No. of features Percentage of positive ... the num- ber of its senses, the number of its data instances, the number of feature, and the percentage of positive sense instances for each data set. Assigning the co...

Ngày tải lên: 23/03/2014, 17:20

... that expression of miR-27 resulted in blockade of expression of PPARc and C ⁄ EBPa, the two master regulators of adipogenesis. Importantly, expression of miR-27 was increased in fat tissue of obese ... role of miR-27 in the regulation of adipogenesis Qun Lin 1 , Zhanguo Gao 2 , Rodolfo M. Alarcon 1 , Jianping Ye 2 and Zhong Yun 1 1 Department of Therapeutic Radiology, Yale U...

Ngày tải lên: 18/02/2014, 08:20

... variety of di- verse sources. They introduced features based on Osgood’s Theory of Semantic Differentiation (Os- good, 1967) using WordNet to derive the values of potency, activity and evaluative of ... number of times term i occurs in D, idf i is the inverse document frequency of term i, N is the total number of documents and df i is the number of documents that contain ter...

Ngày tải lên: 20/02/2014, 04:20

... it is the goal of this pa- per. We want to evaluate the actual impact of us- ing query refinements in the Web People Search (WePS) clustering task (as defined in the frame- work of the WePS evaluation). ... Conference). Each dataset consists of, at most, 100 web pages written in English and retrieved as the top search results of a web search engine, using the (quoted) person name a...

Ngày tải lên: 20/02/2014, 09:20

... harmonic mean of precision and recall. Our calculation of recall scores represents the best-possible performance of systems using only these types of parse-tree paths. This level of per- formance ... em- ploying each of these parsing alternatives? Each of these four questions is addressed in the four subsequent sections of this paper, fol- lowed by a discussion of the...

Ngày tải lên: 20/02/2014, 12:20

... gcel-pursuin~ planner, end the use of dynamic models of speaker and hearer to shape the text to the task at hand. STATEMENT OF THE PROBLEM The task of KDS is to generate English text ... vlz: ordering among sentences and the scope of each, quality comparisons between alternative 8~regations of sub-sententJal units, the coordination of communication with non-linguistic...

Ngày tải lên: 21/02/2014, 20:20

... f'mite set of symbols, so there is only a finite number of strings of given length L, and it has a finite number of rules, so there is only a finite number of possible parse trees of given depth ... Let C a be the set of pairs [A,B] such that A B by a tree of depth n. Clearly C t is the set of pairs [A,B] such that (A ) B) is a rule of G. Also, Cn+ 1 is the s...

Ngày tải lên: 21/02/2014, 20:20

... a set of Arabic documents and an Arabic query, find a list of documents relevant to the query, and rank them by probability of relevance. We used the TREC 2002 documents (several years of AFP ... entire paradigm of a lexical item. The main purpose of stemming as seen in this paper is to conflate the to- ken space used in statistical methods in order to im- prove their effective...

Ngày tải lên: 08/03/2014, 04:22