A framework of region-based dynamic image fusion   总被引：1，自引：0，他引：1  

WANG Zhong-hua QIN Zheng LIU Yu 《浙江大学学报(A卷英文版)》2007,8(1):56-62

INTRODUCTION Image fusion is a sub-area of more general topics of Information Fusion and Data Fusion and deals with static images and dynamic images (image sequences or video data) (Maitre and Bloch, 1997). By com-bining the information from a range of image data obtained by different sensors or the same sensor with different imaging schemes, the composite image al-ways presents the complementary information of different input images at the same time and provides us the integrated descr…  相似文献   

重构式MIS系统构造模型的研究与实现     

戴大蒙 《温州大学学报(社会科学版)》2006,19(1):62-65

在深入剖析国内通用MIS系统开发和应用实际情况的基础上,提出一种基于重构的信息系统构造模型.该模型提供数据库重构模块、查询重构模块和界面解析模块,实现在系统中重新定义数据库对象、重新设计查询界面并保持应用程序和后台数据库的逻辑独立性.实践证明,基于重构式构造模型的MIS系统从根本上降低了维护成本,增强了系统的扩展性和应变能力.  相似文献   

英语请求语用发展研究──以探询型请求子策略之选择为例     

魏冉 《唐山师范学院学报》2011,33(6):52-55

通过语篇补全测试,调查中国英语学习者对探询型请求子策略的选择。结果发现：学习者在请求主体策略选择上呈现与英语母语者相同的序列;学习者在请求子策略选择上存在过多或不当使用某些情态词,某些话句类型使用单一的情况;角色指向性的选择上,以听话者为指向的比率较高。这些特点表明文化间既具有相通性也存在文化相异,需要在教学中积极开展明示语用教学,重视学生语言能力的培养。  相似文献   

“有效性”视域下华语教学若干问题的思考     

李贤军 《毕节学院学报》2016,(2):104-110

华语教学是特殊的二语教学,其最终目的是培养华裔青少年具有在现实生活中自由运用华语进行交际的语言能力。但当前,一些认识因素、教学因素和环境因素严重制约着华语教学的“有效性”,只有实现华语教学目标的综合化、教学过程的交际动态化、教学方法的多元化和教学环境营造的多样化,才是促进华语教学的健康发展、提高华语教学“有效性”的必然选择。  相似文献   

顾客关系动态管理模型研究     

李炜 《湖北广播电视大学学报》2005,22(4):100-101

本文研究和建立了顾客关系动态管理模型——用于预测顾客与公司的未来关系。该模型引入了除顾客总体满意度之外的顾客未来想法变量。理解和管理顾客未来想法对于成功管理顾客动态关系是至关重要的。  相似文献   

Improving the learning of Boolean queries by means of a multiobjective IQBE evolutionary algorithm     

O. Cordón  E. Herrera-Viedma  M. Luque 《Information processing & management》2006

The Inductive Query By Example (IQBE) paradigm allows a system to automatically derive queries for a specific Information Retrieval System (IRS). Classic IRSs based on this paradigm [Smith, M., & Smith, M. (1997). The use of genetic programming to build Boolean queries for text retrieval through relevance feedback. Journal of Information Science, 23(6), 423–431] generate a single solution (Boolean query) in each run, that with the best fitness value, which is usually based on a weighted combination of the basic performance criteria, precision and recall.  相似文献   

Optimization of some factors affecting the performance of query expansion     

Young Mee Chung  Jae Yun Lee 《Information processing & management》2004,40(6):29

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.  相似文献   

Parsimonious translation models for information retrieval     

Seung-Hoon Na  In-Su KangJong-Hyeok Lee 《Information processing & management》2007

In the KL divergence framework, the extended language modeling approach has a critical problem of estimating a query model, which is the probabilistic model that encodes the user’s information need. For query expansion in initial retrieval, the translation model had been proposed to involve term co-occurrence statistics. However, the translation model was difficult to apply, because the term co-occurrence statistics must be constructed in the offline time. Especially in a large collection, constructing such a large matrix of term co-occurrences statistics prohibitively increases time and space complexity. In addition, reliable retrieval performance cannot be guaranteed because the translation model may comprise noisy non-topical terms in documents. To resolve these problems, this paper investigates an effective method to construct co-occurrence statistics and eliminate noisy terms by employing a parsimonious translation model. The parsimonious translation model is a compact version of a translation model that can reduce the number of terms containing non-zero probabilities by eliminating non-topical terms in documents. Through experimentation on seven different test collections, we show that the query model estimated from the parsimonious translation model significantly outperforms not only the baseline language modeling, but also the non-parsimonious models.  相似文献   

基于集对分析的城市生态足迹预测——以武汉市为例     

周敬宣  李湘梅  陈雷  李勇 《资源科学》2007,29(3):111-116

自然生态环境是城市生态系统赖以生存和发展的重要物质基础，生态足迹作为生态环境承载状态测度的指标，受到社会、经济、人口等多种因素的影响，表现出时空动态性和不确定性特征。鉴于集对分析(SPA)在处理不确定性问题的优势，以武汉市为研究对象，将城市总生态足迹与其相关影响因子联系起来考虑，融合集对分析中的同异反模式识别的“择近原则”和聚类分析思想构造集对分析动态模型，模型精度较高，验证误差均小于0.3%。并对武汉市2005年～2020年总生态足迹发展趋势进行了预测。研究结果表明，2005年～2020年总生态足迹将由1 784.662×10⁴hm²增长到2 781.388×10⁴hm²，呈现出低于GDP、高于能源利用率增长速率的趋势，生态环境将进一步恶化，对此就武汉市生态系统的发展提出了对策与建议。最后，指出SPA动态模型对城市生态系统中生态足迹动态化方法的修正具有理论和实际意义。  相似文献   

A review of ontology based query expansion     

J. Bhogal  A. Macfarlane  P. Smith 《Information processing & management》2007

This paper examines the meaning of context in relation to ontology based query expansion and contains a review of query expansion approaches. The various query expansion approaches include relevance feedback, corpus dependent knowledge models and corpus independent knowledge models. Case studies detailing query expansion using domain-specific and domain-independent ontologies are also included. The penultimate section attempts to synthesise the information obtained from the review and provide success factors in using an ontology for query expansion. Finally the area of further research in applying context from an ontology to query expansion within a newswire domain is described.  相似文献