• Proceedings of the Korea Contents Association Conference
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• 2004.05a
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• pp.434-438
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• 2004

In this paper, We offer a new web caching technique for a performance improvement of a multimedia object process. The proposed method is based on a heterogeneity of Web object. And it increases performance of a caching system as increasing the caching efficiency of a multimedia object. In the experiment, We verified performance improvement through performance analysis of a proposed system.

• Proceedings of the Korea Contents Association Conference
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• 2014.11a
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• pp.47-48
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• 2014

최근 개인 사용자에게 최적화된 정보 및 서비스를 제공하기 위해 다수의 소형파일에 대한 분석이 요구되고 있다. 이런 요구사항을 고려해 본 논문에서는 통신주기에 따라 캐시 메타데이터 동기화를 적용한 분산 캐시 관리 기법을 제안한다. 제안하는 기법은 다수의 소형파일을 병합하여 청크에 저장함으로써, 네임노드가 관리하는 메타데이터의 양을 줄였으며, 클라이언트 캐시에 캐시 메타데이터를 추가적으로 저장하는 구조를 갖는다. 또한, 클라이언트와 네임노드 간 통신주기 조절을 통해 클라이언트의 캐시 메타데이터를 갱신함으로써 불필요한 처리시간을 감소시킨다.

• Journal of Digital Contents Society
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• v.6 no.4
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• pp.243-248
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• 2005

In this paper, We proposed joint-modulation CDMA system for efficient streaming transmission. and, We analyzed joint-modulation CDMA system using nakagami fading model and impulsive interference model for transmission channel environment. Also, it can being compensate the performance degradation by using MRC diversity scheme and BCH coding scheme.

• Proceedings of the Korean Society of Computer Information Conference
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• 2019.01a
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• pp.349-350
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• 2019

게임에서 장르를 불문하고 모든 몬스터와 NPC는 AI를 가지고 있다. 따라서 적 몬스터 캐릭터와 전투를 즐기는 액션 게임의 경우 그만큼 인공지능이 게임 안에서 차지하는 비율이 높다고 할 수 있을 것이다. 본 논문에서는 FSM, HFSM, BT와 같은 AI 기법을 비교하여 분석하였다. 각 기법에는 주의해야 할 점이 명확하게 존재하기 때문에 구체적으로 어떠한 문제점들이 존재하는지에 대한 결과를 얻는데 연구 목적이 있다. 따라서 몬스터 AI를 구현할 때 각 인공지능 기법의 장단점을 고려하여 설계하여 유지 보수를 줄이는 방법을 연구해야 한다는 것을 확인할 수 있었다.

• The Journal of the Korea Contents Association
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• v.11 no.10
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• pp.457-466
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• 2011

In general, drivers need a self-interest information to decide their routes. So, non-governmental sectors, such as Internet Portal Company, make and provide user-oriented contents for drivers in a hurry. But, VMS which is the typical public media always provides traffic-information for drivers without weighting personal characteristics and considering transportation conditions. So in this research, we searched importance and preference of traffic-information contents as IPA(Importance-Performance Analysis)result. We can draw the conclusion that the improvement of traffic-information contents focused on users(drivers) is needed. Specially, we proposed the strategy of VMS according to traffic conditions.

• The Journal of the Korea Contents Association
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• v.12 no.3
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• pp.1-8
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• 2012

Video FRUC (Frame Rate Up Conversion) has been a technique of great interest due to its diversified applications in consumer electronics. Most advanced FRUC algorithms adopt a motion interpolation technique to determine the motion vector field of interpolated frames. But, in some applications, it is necessary to evaluate how well the MCI (Motion Compensated Interpolation) frame is reconstructed. For this aim, this paper proposes a distortion estimation for motion compensated interpolation frame using frame-adaptive distortion estimation. The proposed method is applied for the symmetric motion estimation and compensated scheme and then analyzed by three different approaches, that is, forward estimation, backward estimation and adaptive bi-directional estimation schemes. Through computer simulations, it is shown that the proposed bi-directional estimation method outperforms others and can be effectively applied for FRUC.

• The Journal of the Korea Contents Association
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• v.17 no.8
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• pp.685-692
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• 2017

Fine art production methods are frequently incorporated into animation production. The Printing Expression method is often employed among fine art production. There are three main techniques in Printing Expression: Silk Screen, Woodcut and Etching. Animations that use Silk Screen and Woodcut techniques are quite common. However, it is rare to find Etching techniques in animations. So with that being said, I would like to introduce etching animation through the work of Piotr Dumala; the well known Ink Etched film director. Also, I analyzed the characters: movement, unique texture and sensuous feeling; that only mezzotinted Etched-Animation expression technique can show. If we can expand methods on how to show our imagination through etching techniques, it can allow many directors to produce etched animation films in which they can express their imagination.

• The Journal of the Korea Contents Association
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• v.9 no.11
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• pp.309-315
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• 2009

Image reconstruction of Inverse Fourier Transform after Frequency Domain Data is filtered applies to Image signal acquired from MR. There are various kinds of image processing techniques; image preprocessing, image reconstruction, image compression, image restoration image mixture, noise and artifact elimination, and image quality improvement. In this paper, optimum filter applicable to diagnosis in clinic by comparing and analyzing the characteristics of the filter will be explained. Fermi-Dirac filter will improve the image quality better than the previous MR image.

• Proceedings of the Korea Contents Association Conference
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• 2013.05a
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• pp.11-12
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• 2013

최근 대규모 데이터의 처리와 관리를 위한 분산 저장 및 처리 시스템의 연구 및 활용이 중요해지고 있다. 대표적인 분산 저장 및 처리시스템으로써 하둡(Hadoop)이 널리 활용되고 있다. 하둡 분산 파일 시스템을 기반으로 수행되는 맵-리듀스에서 테스크 할당은 데이터의 로컬리티를 고려하여 최대한 가깝게 할당한다. 하지만 맵-리듀스에서의 데이터 분석 작업에서 작업 형태에 따라 빈번하게 요청되는 데이터가 존재한다. 이러한 경우, 해당 데이터의 낮은 로컬리티로 인해 수행시간 증가 및 데이터 전송의 지연의 문제점을 야기 시킨다. 본 논문에서는 맵-리듀스의 처리 속도 향상을 위한 데이터 접근 패턴에 따른 핫-데이터 복제 기법을 제안한다. 제안하는 기법에서는 데이터 접근 패턴에 따라 높은 접근 빈도를 보이는 핫-데이터에 대한 복제본 최적화 알고리즘을 활용하여 데이터 로컬리티를 향상시키고 결과적으로 작업 수행시간을 감소시킨다. 제안하는 기법은 기존 기법에 비해 모든 노드의 데이터 이동이 감소하여 접근빈도의 분포가 균형적인 것을 확인하였다. 성능평가 결과, 기존 기법에 비해 접근 빈도의 부하가 약 8% 감소하는 것을 확인하였다.

• The Journal of the Korea Contents Association
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• v.16 no.12
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• pp.1-9
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• 2016

Computational Fluid Dynamics(CFD) is a branch of fluid mechanics that solves partial differential equations which represent fluid flows by a set of algebraic equations using computers. Even though it requires multifarious variables, only selected ones are stored because of the lack of storage capacity. It causes the requirement of secondary variable calculations at analyzing time. In this paper, we suggest an efficient method to estimate optimal calculation paths for secondary variables. First, we suggest a converting technique from a dependency graph to a ordinary directed graph. We also suggest a technique to find the shortest path from any initial variables to target variables. We applied our method to a tool for data analysis and visualization to evaluate the efficiency of the proposed method.