Users might use general terms to query the information in need, when the exact keyword is unknown. We treat these inexact query terms as general queries. In this paper, we consturct a test data set to evaluate the performance of online search engine on searching Wikipedia with general queries and exact queries. We also proposed a new query expansion method that performs better on general querie...

Abstract In direct sequence code division multiple access (DS-CDMA), frequency-domain equalization (FDE) based on minimum mean square error (MMSE) criterion can be applied to exploit the channel frequency-selectivity and therefore much improved bit error rate (BER) performance than using the conventional rake combining. MMSE-FDE requires accurate frequency-domain channel estimation. In this pap...

This paper proposes structural features for content-based image retrieval (CBIR), especially edge/structure features extracted from edge maps. The feature vector is computed through a “Water-Filling Algorithm” applied on the edge map of the original image. The purpose of this algorithm is to efficiently extract information embedded in the edges. The new features are more generally applicable th...

The limitations of keyword-only approaches to information retrieval were recognized since the early days, specially in cases where different but closely-related words are used in the query and the relevant document. Query expansion techniques like pseudo-relevance feedback rely on the target document set in order to bridge the gap between those words, but they might suffer from topic drift. Thi...

Abstract Multi-keyword ranked searchable encryption (MRSE) supports multi-keyword contained in one query and returns the top-k search results related to keyword set. It realized effective on encrypted data. Most previous works about MRSE can only make complete rank server-side. However, with more practice, users may not be able express some keywords completely when searching. Server-side rankin...

Searchable encryption has many applications including email systems and storage systems. The usefulness of searchable encryption derives from its support of keyword-testability. Keyword-testability means that a receiver of a ciphertext can test whether the ciphertext contains a specific keyword. Recently, Bellare et al. suggested an efficientlysearchable encryption scheme with keyword-recoverab...

Increasing data on web has resulted in increasing challenge for keyword query routing. Top k routing is an approach used for keyword query search. Keyword query routing work efficiently for one or two keyword but its efficiency drastically reduces while handling multiple keywords. Our approach is to increase the efficiency even for multiple keyword querying. We are going to follow keyword-eleme...

abstract the study aimed at investigating the efficacy of written corrective feedback (cf) in improving iranian efl learners’ grammatical accuracy. it compared the effects of focused and unfocused written cf on the learners’ grammatical accuracy. 75 efl students formed a one control and two experimental groups. the focused feedback group was provided with error correction in tenses. the unfocus...