대한간학회 제 8 차 춘계학술대회 초록집 / 포스터 전시 : Orlistat 복용과 관련된 급성 담즙 정체성 간염 유발 증례

김도현,이은희,황재철,정재학,김도현,정재연,김원석,이기명,유병무,함기백,김진홍,조성원,김영배 대한간학회 2002 Clinical and Molecular Hepatology(대한간학회지) Vol.8 No.3(S)

텔레매틱스 서비스 서버 구축

김도현,김민수,이종훈 한국통신학회 2003 정보와 통신 Vol.20 No.12

정보통신의 발전 및 디지털화에 따라 사람들의 이동성이 증가하고 무선통신망과 위치측위 기술을 바탕으로 차량내외의 이동형 정보서비스를 지원하는 텔레매틱스가 이동통신, 자동차, 시스템, 단말기 컨텐츠 분야를 중심으로 대두되고 있다. 이처럼 텔레매틱스는 다양한 분야의 기술을 통합하고 연계하여 서비스를 제공하는 분야이며, 유무선통신기술, 위치측위기술, 시스템통합기술 등의 기반기술을 토대로 재창출되는 서비스의 집합이다. 본 논문에서는 기존의 기반기술 및 서비스를 바탕으로 효율적으로 텔레매틱스 서비스를 구현하기 위한 텔레배틱스 서비스 서버 구축 방안을 기술한다. 기존의 위치기반서비스 및 지능형 교통시스템 등의 관련 분야의 서비스를 통합 서비스 형태로 제공할 수 있는 통합 서비스 서버 모델을 제안한다. 이 모델은 계층화된 구조를 가지고 있어 관련 분야 기반 기술 및 서비스 기술의 적용을 효율적으로 할 수 있어 향후 시스템 확장성을 용이하게 한다. 또한 본 논문에서는 텔레매틱스 서비스 서버를 활용하여 구축된 위치기반라우팅 서비스의 구현사례를 보여준다. 이는 텔레매틱스 서비스 서버를 활용하여 관련 분야의 기반 기술과 서비스의 기술을 효율적으로 활용할 수 있음을 확인할 수 있다.

텔레메틱스와 위치기반서비스를 위한 차세대 통신 기술

김도현,진희채 한국멀티미디어학회 2003 한국멀티미디어학회지 Vol.7 No.4

Multi-view 영상 코딩에서 영상 개선 알고리듬

김도현,최동준,양영일 대한전자공학회 1998 전자공학회논문지SC (System and control) Vol.s35 No.7

In this paper, we propose an efficient multi-view images coding algorithm to find the optimal depth and texture from the set of multi-view images. The proposed algorithm consists of two consecutive steps, i) the depth estraction step, and ii) the texture extraction step, comparedwith the traditional algorithem which finds the depth and texture concurrently. The X-Y plane of the normalized object space is divided into traingular paatches and the Z value of the node is determined in the first step and then the texture of the each patch is extracted in the second step. In the depth extraction step, the depth of the node is determined by applying the block based disparity compensation method to the windowed area centered at the node. In the second step, the texture of the traingular patches is extracted from the multi-view images by applying the affine transformation based disparity compensation method to the traingular pateches with the depth extracted from the first step. Experimental results show that the SNR(Singnal-to- Noise Ratio) of images enconded by our algorithm is better than that of images encoded by the traditional algorithm by the amount about 4dB for for the test sets of multi-view images called dragon, kid, city and santa.

미니스크류 식립 시 상악동의 골두께에 대한 고려

김도현,이진우,차경석,정동화 대한치과교정학회 2009 대한치과교정학회지 Vol.39 No.6

본 연구는 전산화 단층촬영 영상으로 상악동의 형태를 파악하여 교정용 미니스크류를 안전하게 식립할 수 있는 위치를 찾고자 시행되었다. 남자 20명, 여자 20명의 3차원 전산화 단층촬영 사진을 촬영한 후 3차원 영상프로그램을 이용하여 상악동의 형태를 계측하여 통계 분석하였으며 다음과 같은 결과를 얻었다. 상악동저에서 백악법랑경계까지의 골두께는 제1대구치와 제2대구치 사이에서 유의하게 얇았고, 제1소구치와 제2소구치 사이에서 유의하게 두꺼웠다. 상악동저에서 협측 상악골 외연까지의 두께는 제1대구치와 제2대구치에서 유의하게 두꺼웠으며, 제1소구치와 제2소구치 사이에서 유의하게 얇았다. 이상의 결과를 바탕으로 안전하게 미니스크류를 식립하여 교정치료의 영역을 넓힐 수 있을 것이다. Objective: Miniscrews are widely used in orthodontic treatment for the purpose of anchorage control. Maximum anchorage can be acquired by the use of miniscrews. Maxillary miniscrew has many clinical advantage for orthodontic treatment. Maxillary sinus, tooth root can be an obstacle for maxillary miniscrew installation. The purpose of this study was to find the safest area and direction of miniscrew insertion in consideration of the maxillary sinus. Methods: The maxillary sinus area of 40 patients (20 male, 20 female) was measured using 3D computed tomography and 3D reconstruction program. Results: The maxillary sinus floor was located most inferiorly between the 1st molar and 2nd molar and located most superiorly between the 1st premolar and 2nd premolar. Buccal bone thickness from the maxillary sinus is significantly thicker between the 1st molar and 2nd molar and significantly thinner between the 1st premolar and 2nd premolar. The area between the 1st premolar and 2nd premolar has a significantly longer vertical distance from CEJ to sinus in consideration of buccal bone thickness. Conclusions: Considering maxillary bone thickness, the posterior area has advantages over the anterior area for installing miniscrews safely and preventing perforation.

FA-50 개발요구도의 효율적 관리를 위한 추적성 구현

김도현,김성준,안상석,이강훈,장민영,Kim, Do Hyun,Kim, Seong Jun,Ahn, Sang Seok,Lee, Kang Hoon,Jang, Min Young 한국시스템엔지니어링학회 2010 시스템엔지니어링학술지 Vol.6 No.2

Systematic and efficient Management of Development requirements will lead to success of project such as aircraft system development consisting of complex subsystem. For such reason, Requirements management tools have been used in most of project. In the case of FA-50 development project, requirements management tools have been used for systematic and efficient management of FA-50 Requirements. Especially FA-50 system was designed on the basis of the TA-50 configuration. Therefore, it needs traceability of requirements about functions, which have been already developed and will be newly developed. This paper was described about the implementation method of FA-50 development requirements traceability management.

우리의 해방을 위한 운동에 묵묵히 정진하겠습니다

김도현 비판사회학회 2009 경제와 사회 Vol.- No.81

곡예 로보트의 퍼지학습제어에 관한 연구

김도현,오준호 대한기계학회 1994 대한기계학회논문집 Vol.18 No.10

In this paper we propose a new method to determine the learning rates of fuzzy learning algorithm(FLA) in nonlinear MIMO system. The state feedback gains are used from the linearized system of the nonlinear MIMO system. Through this method, it is easy to determine the learing rates. And it is quarauteed the good convergence and confirmed the performance of FLA is better than that of linear controller(LC) through the simulation. Acrobatic robot system is selected as an example(one-input two-output system), and FLA is implemented through the experiment.

국내공항 관제탑의 상대적 효율성에 관한 연구

김도현 한국항공운항학회 2003 한국항공운항학회지 Vol.11 No.2

Air Traffic Control Tower is one of the most important units in Airport operation. It provides services related to safe and efficient traffic flows that control aircraft on the ground maneuvering area and terminal airspace. Also It is responsible for managing of ground operators. The major objective of this study is to evaluates relative efficiency of ATC towers in Domestic airports using data envelopment analysis so that it helps the ATC authority to improve the tower efficiency, to decide the level of benchmarking target and to establish the best alternative. The results of this study are the following; First, as a result of analysis for the potential improvement, it has analysed that the common problems of each ATC tower are to increase its number of flight and to reduce its number of runway followed by airside area, the number of air traffic controller and the number of stand. Second, it has shown that the each tower in RKPC(8), RKPT(5), RKPK(1) and RKSS(1) are used as the reference set. Especially, the tower in RKPC analyzed as a relatively efficient unit is the most main target for the towers in RKTU, RKTH, RKPS and RKTY to do bench marking and to set up the strategy for improving relative efficiency of the tower. Third, tower is actually not able to control the input and output data in this study except the number of controller, so that ATC authority is recommended to improve inefficiency of the towers through handling the number of controller.

위치기반서비스를 제공하는 3GPP와 3GPP2 통신망 비교 분석

김도현,진희채,하수욱,Kim, Do-Hyeon,Jin, Hui-Chae,Ha, Su-Uk 한국공간정보학회 2002 개방형지리정보시스템학회 논문지 = Journal of the Korea Open Geogr Vol.4 No.2

Various tries are in progress to expand the usability of wireless telecommunication harminized internet technology. The most typical example among those services is LBS(Location Based Service). Nowaday, Standards for telecommunication system of LBS centers round on 3GPP(3rd Generation Partnership Project) and 3GPP2. In this paper we compare the telecommunication system of 3GPP and 3GPP2 in order to make domestic standards of telecommunication system to provide LBS. First, we investigate network models and interfaces of GSM(Global System for Mobile) and ANSI(America National Standard Institute)-41/PCS1900 - Telecommunication type of 2nd generation. Also we consider those of UMTS (Universal Mobile Telecommunication System) and cdma2000 - Telecommunication type of 3nd generation. Then we analysis function components for LBS of each network models details.