• KSCE Journal of Civil and Environmental Engineering Research
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• v.6 no.2
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• pp.77-83
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• 1986

In this paper, an accurate model for structural analysis of frames with shear walls is introduced. Static and dynamic analysis of two example structures has been performed using the computer program SWAN which employes the newly developed 12 degrees of freedom plane stress element and the results are compared to those obtained using SAP IV. The 12 degrees of freedom element resulted in improved shear stress distribution in wall elements and bending moment in beam elements.

• Convergence Security Journal
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• v.2 no.1
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• pp.35-47
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• 2002

In this paper, we will provide an overview of the motion picture watermarking techniques. We will see previously proposed algorithms such as compressed domain watermarking, non-compressed domain watermarking and algorithms for realtime applications etc. We will see test results for signature embedding in motion picture. By spread spectrum method, we embed a signature in each frames. The quality of watermarked motion picture is measured by PSNR(peak signal to noise ratio) about several strengths of watermark. In watermark detection the sign of the correlation sum is the estimated embedded signature bits. We will see different mean PSNR with visual shape of the detected signature.

• 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.18 no.4
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• pp.575-585
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• 2018

The side effects of drug is closely linked to the people's health and professional. In this case, press report is very important in evaluating the side effects of drug and people's attitude of government's health policy. This study analyzed press report on the side effects of drug based on the main theme, source, responsibility attribution on crisis, frame and network analysis. Theses is a difference of main theme between the press. Daily newspaper focused on the occurrence of crisis and economical newspaper focused on the manufacture company. Professional paper focused on the criticizing of the health policy. The main source of the press on the side effects of drug is the Congressman. There are few articles which mentions about the crisis responsibility. However most articles mentioned that the subject of crisis solutions is the manufacturer. This study found the main meaning by network analysis. This study highlighted the government's crisis management based on the result of content analysis and network analysis.

• The KIPS Transactions:PartC
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• v.17C no.6
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• pp.485-490
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• 2010

IEEE 802.11n supports two frame aggregation schemes, aggregation for MAC service data unit (A-MSDU) and aggregation for MAC protocol data unit (A-MPDU), to improve throughput at the MAC layer. In this paper, we propose a cooperative frame aggregation (CoFA), which can recover erroneous frames in a cooperative manner based on A-MPDU. Specifically, CoFA receive multiple frames from direct and relay paths, and combined multiple frames jointly. Numerical results show that CoFA outperforms direct transmission and relay transmission over diverse channel conditions.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.14 no.4
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• pp.435-444
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• 2001

Even todays, accurate and efficient algorithms for the large deformation analysis of elastoplastic frame structures lack due to the complexities of kinematics, material nonlinearities and numerical methods to cater for. The author suggests appropriate beam element based upon the incremental formulation from the 3D rod theory where Cauchy stress and engineering strain are variables to incorporate plasticity equations so that objectivity may be satisfied. A rectum mapping methods which can integrate and satisfy yield criteria efficiently is suggested and a continuation method which has global convergency and quadratic speed is developed as well. leading-unloading example problems are tested and the ideas are proved to be valuable.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2010.07a
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• pp.281-282
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• 2010

CMMB(China Multimedia Mobile Broadcasting)는 중국에서 개발된 이동 방송 시스템이다. CMMB는 시간 동기와 주파수 동기를 획득하기 위해 프레임에 포함된 두 개의 동기 신호와 OFDM 심볼을 이용한다. 이는 OFDM 심볼의 연속파일럿과 분산 파일럿을 이용하는 기존의 이동 방송시스템과 달리 CMMB를 위한 특화된 동기 알고리듬이 필요하다. 이에 본 논문은 CMMB의 프레임 구조에 적합한 시간 동기 알고리듬에 대하여 연구하였다. 제안 알고리듬은 CMMB의 동기신호를 이용하여 상관값을 구한 후 1차와 2차로 나누어 경계값을 초과 하는 값을 검색하여 프레임의 시작점으로 추정한다. 제안된 알고리듬은 컴퓨터 시뮬레이션으로 검증하였으며 다중 경로 상황에서도 우수한 성능을 보인다.

• Journal of Game and Entertainment
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• v.2 no.1
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• pp.27-34
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• 2006

Computer-assisted animation production tools have an important role in animation production industries. They could reduce the production cost and time, but they rarely copy artistic characteristics of an animators. In this paper, a new computer-assisted line pattern drawing system is proposed. The system automatically copies artistic characteristics of an animator and applies them to computer-generated animations. The artistic characteristics are captured from key frames drawn by an animator. The result shows that the presented approach can copy artistic characteristics from key frames well and reduce time and cost for producing artistic animations.

• Journal of Korea Multimedia Society
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• v.9 no.11
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• pp.1515-1528
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• 2006

Systems for physically based fluid animation have developed rapidly in the visual special effects industry and can make very high quality images. However, in the real-time application fields such as computer game, the simulation speed is more critical issue than image quality. This paper presents a real-time method for animating fluid using programmable graphics pipeline. We show that once two key-frames are given, the technique can interactively generate a sequence of images changing from the source key-frame to the target.

• Proceedings of the Korean Information Science Society Conference
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• 2001.10c
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• pp.157-159
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• 2001

인터넷 화상전화는 저렴한 가격으로 통신이 가능하게 하는 기술로 최근에 주목을 받고 있다. 인터넷은 제한적인 대역폭과 가변적인 손실을 나타내므로, 인터넷을 통해 전송되는 화상은 오류 전파에 의해 품질이 크게 떨어지게 된다. 일반적으로 화상은 움직임 예측, 보상기법을 이용하여 압축되기 때문에 한 프레임에서 발생한 오류가 그 프레임을 참조하는 프레임으로 전파되는 데 이를 오류 전파라고 한다. 기존의 오류 전파를 방지하는 기법에는 Error Tracking, NEWPRED, PFEC등이 있다. 본 논문에서는 인터넷 화상 전화에서 화상의 움직임이 적은 특성을 고려하여 Motion Vector의 중복전송을 이용한 PRMS기법을 제안한다. PFEC에 비해 부호화 효율을 높이면서 MB단위로 참조 프레임을 선택하여 오류 전파를 효과적으로 방지하는 기법이다. 실험을 통하여 PRMS기법이 기존치 PFEC나 NEWPRED에 비해 성능이 우수함을 보인다.