2008, Vol.13, No.1

Journal of The Korea Society of Computer and Information 2023 KCI Impact Factor : 0.65

pISSN : 1598-849X / eISSN : 2383-9945
https://journal.kci.go.kr/jksci

In order to high-performance data processing, effective resource selection is needed since grid resources are composed of heterogeneous networks and OS systems in the grid environment. In this paper, we classify grid resources with data properties and user requirements for resource selection using a decision tree method. Our resource selection method can provide suitable resource selection methodology using classification with a decision tree to grid users. This paper evaluates our grid system performance with throughput, utilization, job loss, and average of turn-around time and shows experiment results of our resource selection model in comparison with those of existing resource selection models such as Condor-G and Nimrod-G. These experiment results showed that our resource selection model provides a vision of efficient grid resource selection methodology.

Nearest-neighbor searches are essential operations in various applications such as multimedia systems and GIS systems. Although numbers of research works for nearest-neighbor search have been proposed, they have a limitation on the performance since they process queries on the fly with indexes on data. This paper proposes a new nearest-neighbor search algorithm based on a grid-based data structure, which preprocesses and stores the result of nearest-neighbor queries using Voronoi diagrams over static data. While traditional techniques try to index data itself, the proposed technique attempts to index the result of the queries. Therefore, it performs nearest-neighbor queries more efficiently.

The man who wants to create advance user created contents is in need of using chroma-key method in a certain environment. Recently, pavilion that is painted with mono-color is used for the application of chroma-key. This paper aims to introduce a robust automatic adaptive chroma-key method without using pavilion. In this research, a new chroma-key method is applied to the separation of high frequency and low frequency using Wavelet is done in order that the noise can be eliminated. As a result, a chroma-key method with good capacity is shown from the research.