AlloDerm??을 이용한 하지 연부조직 결손의 재건

강양수,류봉수,양정열,나영천 大韓成形外科學會 1999 Archives of Plastic Surgery Vol.26 No.5

Variable methods have been using for reconstruction of soft tissue defect of feet and legs. Skin graft, local flap, and free flap have been using for this purpose. But, skin graft produced secondary contracture of recipient site and increased in donor site scarring. Local flap was limited its donor site and remained severe deformities of recipient site. Free flap was required prolonged operation time and secondary operation. Acelluar human dermal allograft, AlloDerm, was removed cellular elements of the epidermis and dermis. It was relatively immunologically inert. From August 1997 to April 1998, we have grafted acellular human dermal allograft with thin split-thickness skin graft on soft tissue defect of feet and legs in 7 cases. We concluded that cryopreserved acelluar human dermal allograft has been proposed as the solution to problems of skin graft, local flap, and free flap.

P2P 네트워크에서 컨텐츠 분배가 가능한 멀티소스 미디어 스트리밍

소양선,최창열 강원대학교 정보통신연구소 2004 정보통신논문지 Vol.8 No.-

Recently, the Peer-to-Peer (P2P) contents sharing application is actively used in the Internet and as a result, concerns about P2P are more being increased. But because a file sharing scheme of existing P2P cannot play until media file is completely downloaded, there is a shortcoming that has long response time. The P2P media streaming which simultaneously can play as downloading media poses challenging problems compared with the file sharing approach. Especially, because each peer that constructs P2P network has different bandwidths, upload rates and computer capacities, in the media streaming that must receive media data within limited period, QoS is not sufficient in the case that peer receiving data acquires data from a certain peer. To solve for these problems, we can consider a multi-source streaming which receives data from various peers. In this paper, we describe multi-source media streaming system for the P2P network environment. In the proposed- scheme, firstly, we can increase a media transmission rate as receiving data from different peers. Secondly, after receiving media files, they can be played at the moment they are stored. Therefore we can reduce a user response time and distribute contents through networks. Thirdly, we can lead a fast contents distribution caused by transmission of a part of m d a file under downloading and concurrently can expect to increase the number of subscribers. We expect that the proposed multi-source media streaming system for the P2P network environment can be generalized for a high speed network as well as a b h capacity personal computer, so that it can deal with various multimedia contents.

PDA 밸브에 의한 연소실내의 연소특성에 관한 연구

김대열,한영출,조재명,김양술,주신혁,박병완 한국공작기계학회 2003 한국공작기계학회 추계학술대회논문집 Vol.2003 No.-

An experimental study presents characteristics of combustion in a combustion chamber by port deactivation valve for economy and emissions standards. In order to use combustion properties data, it is necessary to build some data base, which use cylinder pressure sensor, etc. Port deactivation valve has been developed to satisfy requirement of achieving sufficient swirl generation to improve the combustion. A feasibility and necessity of combustion pressure based cylinder spark timing control has been examined. So, this was obtained the Coefficient of Variation(COV) and the mass-burned(MFB). The characteristics of pressure ratio fraction is similar to that of mass-burned fraction. Using the results of the test, the effects of the combustion chamber can be improved combustion stability by port deactivation.

6·15 정상회담 이후의 남북문화교류의 현황과 전망

오양열 中央大學校 民族發展硏究院 2002 民族發展硏究 Vol.- No.7

홀로그램 암호화와 간섭 복호화를 이용한 디지털 워터마킹

김병열,도양희 제주대학교 공과대학 첨단기술연구소 2002 尖端技術硏究所論文集 Vol.13 No.2

A new optical watermarking system is proposed. The proposed system is applied for digital watermarking by using binary phase hologram and Mach-Zehnder interferometer. A mark image to be hidden is randomly phase-modulated image, and its Fourier-transformed hologram image is superposed on the original image. The information for authentication is extracted by using Mach-Zehnder interferometer. The availability of the proposed watermarking system is confirmed by computer simulation.

형상인식을 적용한 용접 결함의 특징변수 추출

김재열,마상동,오성민,송경석,김양중,김창현,곽이구 朝鮮大學校 機械技術硏究所 1999 機械技術硏究 Vol.2 No.2

In this study, the researches classifying the natural flaws in welding parts are performed using the signal pattern classification method. For this purpose 500MHz storage digital oscilloscope including FFT function and enveloped waveform generator are used and the signal pattern recognition procedure is made up the digital signal processing, feature extraction, feature selection and classifier design. Specially it is composed with and discussed using the distance classifier is based in euclidean distance the empirical Bayesian classifier. In feature extracting, it is performed using the class-mean scatter criteria. And the signal Pattern classification method is applied to the signal pattern recognition problems of natural flaw that is porosity inclusion, slag inclusion, lack of penetration, lack of fusion. center crack, side crack, toe crack. root crack as the planar and volumetric flaw classification problem. According to this results, if appropriately learned the neural network classifier is better acquire the recognition rate of 86.31% above through it is different a little according to domain extracting the feature and the classifier

디지털 워터마킹을 위한 새로운 광 시스템

도양회,김병열 제주대학교 공과대학 첨단기술연구소 2003 尖端技術硏究所論文集 Vol.14 No.1

A new optical system is proposed for digital watermarking. The proposed system uses binary phase hologram and Mach-Zehnder interferometer. The mark image to be hidden is randomly phase-modulated image, and its Fourier-transformed hologram image is superposed on the original image. The mark image, the information for authentication, is extracted by using Mach-Zehnder interferometer. The availability of the proposed watermarking system is confirmed by computer simulation and optical experiment.

세탁기용 자동변속기(Auto-Transmission)의 이상음 검사용 자동화 프로그램 개발

김재열,김양중,한재호,마상동,김창현 朝鮮大學校 機械技術硏究所 2000 機械技術硏究 Vol.3 No.1

This study includes automatic program for noise inspection of auto-transmission for washing machine one of modern home necessary. We effort to find and certificate sound noise source by sound power and sound intensity, and apply to frequency analysis in vibration related sound noise. Still more we have been studying to data acquisition and programming for MS VisualBasic version 5.0. System component is below. 1) Pentium PC for data acquisition. 2) DSO for noise acquisition. 3) S/W for comparison and decision. 4) I/F Board for data communication. Wave form data through the DSO are converting to ASCII code data. The ASCII code through binary converting S/W are to be decision fitness or the badness comparison S/W. Finally, we will making noise monitoring system and automatic program for inspection system

미소결함의 형상인식을 위한 디지털 신호처리 적용에 관한 연구

김재열,홍석주,이규태,김병현,김훈조,김양중 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.1

In this study, the classified researches the artificial and natural flaws in welding pails are performed using the pattern recognition technology. For this purpose the signal pattern recognition package including the user defined function was developed and the total procedure including the digital signal processing, feature extraction, feature selection and classifi-er selection is treated by bulk. Specially it is composed with and discussed using the statistical classifier such as the linear discriminant function the empirical Bayesian classifier. Also, the pattern recognition technology is applied to classifica-tion problem of natural flaw(i.e multiple classification problem - crack, lack of penetration, lack of fusion, porosity, and slag inclusion, the planar and volumetric flaw classification problem). According to this results, it is possible to acquire the recognition rate of 83% above even through it is different a little according to domain extracting the feature and the classifier.

준설매립 점토의 자중압밀 특성에 관한 연구

이송,양태선,베열호,황규호 서울市立大學校 1993 論文集 Vol.27 No.-

연약하고 압축성이 큰 준설 점토는 액, 소성한계가 크고 불안정한 상태에 있다. 이 흙의 침하속도는 압밀계수에 의해 결정된다. 이 연약한 점토를 다루기 쉽게 만들고 안전하게 하는 것은 우리 토질기술자들이 할 일이다. 자중압밀, 침투압밀, 저응력재하 압밀실험은 표준압밀과 비교해서 비선형적인 특징을 갖는다. 우선 압밀계수가 표준압밀에서는 상수로 취급할 수있지만 저응력의 범위에서는 비선형성을 보인다. 투수계수는 저응력범위에서 비선형이 되지만 표준압밀에서는 하중이 증가할수록 상수로 수렴하는 경향이 있다. 침강에서 자중압밀로 넘어 가면서 입자가 무거운 씰트가 먼저 가라앉고 상대적으로 가벼운 점토가 나중에 가라앉아서 다층구조를 이룬다. 자중압밀, 침투압밀, 응력재하는 서로 연관성을 갖는 것을 실험결과에서 알 수 있다. Dredged soft and compressible soil with high liquid limit and plastic limit is unstable. The rate of settlement in this soil layer is characterized by a coefficient of consolidation. To make this soft clay treat easily, what we have to do makes it stable. And this consolidation has non-homogeneous characteristics compared with the standard consolidation test. First, Cv shows non-linear at the range of low stress but constant in the standard consolidation test. A coefficient of permeability becomes non-linear in the low stresses but converges constant in the standard consolidation test as loading grows. Sedimentation and self-weight consolidation leads to multi-layered soil structure. Self-weight, seepage, loading consolidations are interrelated during the test.