In this paper, a reversible data hiding scheme based on a Vector Quantization (VQ) index table is proposed. To satisfy different needs of users, our proposed scheme is designed with flexibility in adjusting hiding capacity and compression rate. First, the codebook is rearranged referring to the index occurrence frequency in the VQ index table. After that, the codewords in the newly generated co...

Keywords have played an important role not only for searchers who formulate a query, but also for search engines that index documents and evaluate the query. Recently, tags chosen by users to annotate web resources are gaining significance for improving information retrieval (IR) tasks, in that they can act as meaningful keywords bridging the gap between humans and machines. One critical aspect...

It is generally believed that a major cause of motor dysfunction is the impairment in neural network that controls movement. But little is known about the underlying mechanisms of the impairment in cortical control or in the neural connections between cortex and muscle that lead to the loss of motor ability. So understanding the functional connection between motor cortex and effector muscle is ...

The Discounted Cumulated Impact (DCI) index has recently been proposed for research evaluation. In the present work, an earlier data set by Cronin & Meho (2007) is reanalyzed, with the aim of exemplifying the salient features of the DCI index. We apply the index on, and compare our results to the outcomes of, the Cronin-Meho (2007) study. Both authors and their top publications are used as unit...

In th is article, a form alisation of ind ex expressions is presented . Index expressions are m ore expressive th an keyw ords w hile m aintaining a com ­ prehensible com plexity. Index expressions are w ell-know n in Inform ation R etrieval (IR ), where th ey are used for characterising docum ent contents, form ulation of user in terests, and m atch ing m echanism s. In addition , in­ dex expr...

The recent explosion in Internet growth has left many users awash in a sea of information, and has spurred the need for intelligent filtering systems. This paper describes work implemented in the INFOS (Intelligent News Filtering Organizational System) filtering system that is designed to reduce the user's search burden by automatically categorizing data as relevant or irrelevant based upon use...

index tracking is the process of developing a portfolio that reproduces the performance of an index. the tracker portfolio has relatively good diversity and low turnover and low transaction costs. in this paper we applied a binary programming model for index tracking problem. in this model the number of assets for portfolio construction is defined by portfolio manager. the robust optimization f...

This paper investigates the publishing trends of search engine literature as catalogued in the social sciences citation index (SSCI) database in the period 1995-2009. Our findings indicate that (1) the quantity of recent research on search engine study is expanding remarkably; (2) the frequency indices of author productivity appear to abide by Lotka’s Law; (3) most research papers on search eng...

works within the stores of recorded knowledge. In the digital environment scholars are seeking and using information in new ways and generating new types of scholarly products, many of which are specialized resources for access to research information. These practices have important implications for the collection and organization of digital access resources. Drawing on a series of qualitative ...

This research aims to incorporate the results of co-word analysis into information retrieval as a means to increase search variety for end users in the domain of information retrieval. Relevant data were first collected from the Science Citation Index and Social Science Citation Index for the period of 1987-1997. The results of co-word analysis on the data were compared with similar data obtain...