This paper explores the application of term dependency in information retrieval (IR) and proposes a novel dependency retrieval model. This retrieval model suggests an extension to the existing language modeling (LM) a...This paper explores the application of term dependency in information retrieval (IR) and proposes a novel dependency retrieval model. This retrieval model suggests an extension to the existing language modeling (LM) approach to IR by introducing dependency models for both query and document. Relevance between document and query is then evaluated by reference to the Kullback-Leibler divergence between their dependency models. This paper introduces a novel hybrid dependency structure, which allows integration of various forms of dependency within a single framework. A pseudo relevance feedback based method is also introduced for constructing query dependency model. The basic idea is to use query-relevant top-ranking sentences extracted from the top documents at retrieval time as the augmented representation of query, from which the relationships between query terms are identified. A Markov Random Field (MRF) based approach is presented to ensure the relevance of the extracted sentences, which utilizes the association features between query terms within a sentence to evaluate the relevance of each sentence. This dependency retrieval model was compared with other traditional retrieval models. Experiments indicated that it produces significant improvements in retrieval effectiveness.展开更多
As a new field in the Discourse Analysis, Positive Discourse Analysis (PDA) is increasingly arousing more attention of linguistic scholars at home and abroad. However, in the field of the concession addresses, the s...As a new field in the Discourse Analysis, Positive Discourse Analysis (PDA) is increasingly arousing more attention of linguistic scholars at home and abroad. However, in the field of the concession addresses, the studies on this kind of political text are limited. The winners of presidential election always draw much attention from the world and their speeches, for example, presidential inaugural address has been a hot study topic of linguistics. Nevertheless, the losers of presidential election are always neglected by the world and the study on concession address is scarce and rare. Therefore, the meaning of study on the concession speech helps fill the gap of the discourse analysis. This thesis applies the PDA under the framework of appraisal theory to analyze five concession speeches with a combination of qualitative and quantitative approaches. This study aims to complement CDA (Critical Discourse Analysis) to emphasize positive social construction of political discourse.展开更多
The 3D visualization model of slop with structural plane can displayed the characters of structural plane in slop directly, and illustrated the spatial combination. It is a modem and critical question in the field of ...The 3D visualization model of slop with structural plane can displayed the characters of structural plane in slop directly, and illustrated the spatial combination. It is a modem and critical question in the field of geotechnical engineering. Based on the peculiarity of the reconnaissance and the research of the visualization by formers, systemized the method fit for building 3D visualization model of slop with structural plane. Write the special program with Visual C^-+ computer language and illustrated it by OpenGL, the program can displayed and captured the random section plane. The program has a satisfied result by proving with the real projects.展开更多
基金Project (No. 2006CB303000) supported in part by the National Basic Research Program (973) of China
文摘This paper explores the application of term dependency in information retrieval (IR) and proposes a novel dependency retrieval model. This retrieval model suggests an extension to the existing language modeling (LM) approach to IR by introducing dependency models for both query and document. Relevance between document and query is then evaluated by reference to the Kullback-Leibler divergence between their dependency models. This paper introduces a novel hybrid dependency structure, which allows integration of various forms of dependency within a single framework. A pseudo relevance feedback based method is also introduced for constructing query dependency model. The basic idea is to use query-relevant top-ranking sentences extracted from the top documents at retrieval time as the augmented representation of query, from which the relationships between query terms are identified. A Markov Random Field (MRF) based approach is presented to ensure the relevance of the extracted sentences, which utilizes the association features between query terms within a sentence to evaluate the relevance of each sentence. This dependency retrieval model was compared with other traditional retrieval models. Experiments indicated that it produces significant improvements in retrieval effectiveness.
文摘As a new field in the Discourse Analysis, Positive Discourse Analysis (PDA) is increasingly arousing more attention of linguistic scholars at home and abroad. However, in the field of the concession addresses, the studies on this kind of political text are limited. The winners of presidential election always draw much attention from the world and their speeches, for example, presidential inaugural address has been a hot study topic of linguistics. Nevertheless, the losers of presidential election are always neglected by the world and the study on concession address is scarce and rare. Therefore, the meaning of study on the concession speech helps fill the gap of the discourse analysis. This thesis applies the PDA under the framework of appraisal theory to analyze five concession speeches with a combination of qualitative and quantitative approaches. This study aims to complement CDA (Critical Discourse Analysis) to emphasize positive social construction of political discourse.
文摘The 3D visualization model of slop with structural plane can displayed the characters of structural plane in slop directly, and illustrated the spatial combination. It is a modem and critical question in the field of geotechnical engineering. Based on the peculiarity of the reconnaissance and the research of the visualization by formers, systemized the method fit for building 3D visualization model of slop with structural plane. Write the special program with Visual C^-+ computer language and illustrated it by OpenGL, the program can displayed and captured the random section plane. The program has a satisfied result by proving with the real projects.