information retrieval from the web

Ngày tải lên: 23/03/2014, 16:21

... each kind. These patterns are the only attribute-specific resource in our framework. Value extraction. The first pattern group, P values , allows extraction of the attribute values from the Web. All ... width 1.695m]’). We then extract new pat- terns from the retrieved search engine snippets and re-query the Web with the new patterns to obtain more attribute values. We provided the framework with ... value for the given object. During the first stage it is possible that we directly extract from the text a set of values for the requested object. The bounds processing step rejects some of these...

Ngày tải lên: 20/02/2014, 04:20

... query is a term, its hit is the number of pages that contain the term on the Web. We use the following notation. H(x)= the number of pages that contain the term x” The number H (x) can be used ... half (Evaluation II) in Table 2 shows the result. S: the target term was collected by the system. F: the target term was removed in the filtering step. A: the target term existed in the compiled corpus, but ... automatic term extrac- tion. C: the target term existed in the collected web pages, but did not exist in the compiled corpus. R: the target term did not exist on the collected web pages. Only 43 terms...

Ngày tải lên: 20/02/2014, 16:20

... that, using the new web mining scheme, the web mining throughput is increased by 32%; (ii) The quality of the mined data is improved. By lever- aging the web pages’ HTML structures, the sen- tence ... English-Chinese parallel data from the web. The mining procedure is initiated by acquiring Chinese website list. We have downloaded about 300,000 URLs of Chinese websites from the web directories at ... (1) Given a web site, the root page and web pages directly linked from the root page are downloaded. Then for each of the downloaded web page, all of its anchor texts (i.e. the hyperlinked...

Ngày tải lên: 08/03/2014, 02:21

... coefficient (Web- Jac), the Pointwise Mutual Information (Web- PMI) and the conditional probability (Web- P). We also present a version of the conditional probability which does not use the Web but merely ... (not calculated over the Web) as well as the conditional probability cal- culated over the Web (Web- P) delivered the best re- sults, while the PMI-based ranking measure yielded the worst results. ... appropriate queries to the web search engine and choosing the article leading to the highest number of results. The corresponding patterns are then matched in the 50 snippets returned by the search engine...

Ngày tải lên: 08/03/2014, 02:21

... (16) below: The dog bit the postman. (16a) The dog bit the postman on the hand. (16b) The dog with fangs bit the postman on the hand. (16c) The relationships which obtain between these sentences ... and if the second keyword falls in the ith sentence from the first keyword, then the third keyword must fall within n-i sentences of either of the previous keywords, or between them. In theory ... This is to say, the longer the segment, the more unelicited information will appear in the response; the shorter the segment, the more elicited information will not appear in the response. It...

Ngày tải lên: 16/03/2014, 19:20

... our modified version of the competitive link- ing algorithm, the link score of a pair of words is the sum of the φ 2 scores of the words themselves, their prefixes and their suffixes. In addition ... pairs, where the translation of the in-parenthesis terms is a suffix of the pre-parenthesis text. The lengths and frequency counts of the suffixes have been used to determine what is the translation ... C ≥ 2 E + K, where C is the length of the Chinese text, E is the length of the English text in the parentheses and K is a constant (we used K=6 in our experiments). The lengths C and E are...

Ngày tải lên: 17/03/2014, 02:20

... hyponym patterns to extract class instances from the web and then evalu- ates them further by computing mutual information scores based on web queries. The work by (Widdows and Dorow, 2002) on lex- ical ... to instantiate the pattern. On the first iteration, the pattern is given to Google as a web query, and new class members are extracted from the retrieved text snippets. We wanted the system to ... progresses. Initially, the seed is the only trusted class member and the only vertex in the graph. The bootstrapping process begins by instan- tiating the doubly-anchored pattern with the seed class...

Ngày tải lên: 17/03/2014, 02:20

Ngày tải lên: 17/03/2014, 04:20

Ngày tải lên: 17/03/2014, 22:20

Ngày tải lên: 23/03/2014, 16:20

Ngày tải lên: 23/03/2014, 18:20

Ngày tải lên: 23/03/2014, 18:20

Ngày tải lên: 31/03/2014, 01:20

Ngày tải lên: 31/03/2014, 01:20

Ngày tải lên: 22/06/2014, 23:20

... to the Web sites listed at the end of this Guide. Not only do they carry archives of these Guides, they carry a lot of other valuable information for the newbie hacker, as well as links to other ... some people take the shortcut into hacking. They get their phriends to give them a bunch of canned break-in programs. Then they try them on one computer after another until they stumble into ... other technical documents from the Web. Besides, the Web stuff is free! <Geek mode off> The most fantastic Web resource for the aspiring geek, er, hacker, is the RFCs. RFC stands for "Request...

Ngày tải lên: 23/12/2013, 19:15

... through the WWW The WWW can be considered as an exemplar lin- guistic resource for decision-making (Grefenstette, 1999). In the present study, the WWW is exploited in order to re-score the set ... a phrasal translation. We follow the same steps as the WWW-based technique, replacing the WWW by a test collection and a retrieval system to index docu- ments of the test collection. NTCIR test ... solve the problem of phrasal translation. The interactive environment setting should optimize the phrasal translation, select best phrasal transla- tion alternatives and facilitate the information...

Ngày tải lên: 20/02/2014, 16:20

... one million news ar- ticles from the Associated Press, the New York Times, and the Xinhua News Agency. 3 Document Retrieval Since information retrieval systems supply the ini- tial set of documents ... properties of the document containing the sentence and properties of the sentence itself. Regarding the former type, two features come into play: the relevance score of the document (from the IR engine) ... Introduction The field of question answering arose from the recognition that the document does not occupy a privileged position in the space of information ob- jects as the most ideal unit of retrieval. ...

Ngày tải lên: 08/03/2014, 02:21

... ad-hoc task of the 1999 Web track, for the WT2G test collection, and the queries 451-500 from the ad-hoc task of the 2000 Web track, for the WT10G test collection, with their respective relevance ... We test these hypothe- ses in the context of Information Retrieval, by syntactically representing queries, and removing from them content-poor blocks, in line with the aforementioned hypothe- ses. ... in the DFR weighting schemes, where BB2 and PL2 improved the most from our hypothesised noise reduction in the queries, while DLH improved the least, is no longer valid. The improvement in retrieval...

Ngày tải lên: 08/03/2014, 02:21