일반적인 Lattice 구조의 적응 IIR 필터 설계에 관한 연구

오현철,김윤상,안두수 成均館大學校 科學技術硏究所 1998 論文集 Vol.49 No.2

An adaptive joint-process IIR filter with generalized lattice structure is implemented by modifying the conventional lattice filter and making an adaptive algorithm in a system identification problem. LMS algorithm used to estimate of the error-surface gradient to update the filter coefficient.

The Korean Church Needed for the 21st Century

오현철 聖潔大學校 聖潔神學硏究所 1997 聖潔神學硏究 Vol.2 No.-

근사 역시스템을 이용한 비최소위상플랜트의 적응제어기 설계

오현철,김윤상,안두수 成均館大學校 科學技術硏究所 1998 論文集 Vol.49 No.1

This paper presents approach to the adaptive control of nonminimum-phase continuoustime systems. The usual model reference adaptive control methods cannot be applied to nonminimum-phase systems, because unstable pole-zero cancellations cannot be avoided. In this paper, it is shown that pole-zero cancellations can he avoided by using approximate inverse systems. The least square approximation is used to find these approximate inverse systems.

Laguerre 모델을 이용한 시스템 근사화

오현철,김윤상,안두수 成均館大學校 科學技術硏究所 1998 論文集 Vol.49 No.1

This paper presents an efficient method which can approximate unknow systems using Laguerre models. This method is to approximate system from only input-output information, which can exclude additional procedure for system description. and thus reduce the required computational burden. The proposed method has the advantage that an unknown system can be modelled without structural knowledge and assumption about the true model order and time delay.

STWS를 이용한 최적추종 제어기 설계

吳顯哲,金潤相,安斗守 성균관대학교 1998 학술회의지원논문목록집 Vol.1998 No.-

This paper presents a design method of optimal tracking controller and reduced-order obsercer for time invariant comtinuous system using STWS(single term Walsh series). In optimal control, it is well known that the design problem with quadratic performance criteria often involves the determination of time varying feedback gain matrix by solving the matrix nonlinear Riccati equation and of command signal by solving the intergral equation, which makes design procedure quite difficult. Therefore, in order to resolve this problem this paper introduces STWS. In this paper, the time-varying feedback gains and command signals are determined by piecewise constant gains which can be easily determined by algebraic equation using STWS.

경기도 용인시(경희대학교) 주변지역의 지하수 오염현황

오종민,김홍석,진현오,윤세철 경희대학교 환경연구소 1998 環境硏究 論文集 Vol.8 No.-

Recently, the concern about groundwater pollution is increasing. And, groundwater was one of the major water resource used as drinking water by eighty percent of the world population, and its utility as industry water, agriculture water, fresh water was increasing. But, when pollution material was found in housing well, by purifying polluted water, the area of doing thorough conservation management was few. Thus, if water resource being regard as unlimited source, the right view of nature and scientific utility were essential because of the problem of its value. The purpose of this study was that investigated groundwater quality pollution condition in the part areas of Kyunggi-do Suwon Si, Yong-In Si, proposed to efficient management plan for pollution occurrence prevention and groundwater quality development by surveying groundwater pollution source. The result of the study was that the groundwater by use purpose could systematically manage water quality since development beginning, management system about groundwater development with use can established.

수종의 치과용 수복재료 및 시멘트의 radiopacity

정현주,강병철,오원만,양홍서 大韓口腔顎顔面 放射線學會 1994 Imaging Science in Dentistry Vol.24 No.1

The radiopacity of six composite resins, three resin luting cements and ten filling materials were studied. The purpose was to obtain an indication of radiopacity value of different brands within each of these groups of materials and to show differences in radiopacities of filling materials and natural tooth structures. On radiographs, the optimal densities of standardized samples were determined by computer imaging system and radiopacity values of the materials were expressed in millimeter equivalent aluminum. Within the groups of materials studied, there was considerable variation in radiopacity. The composite resins of P-50, Z100 and Prisma AP.H displayed much higher radiopacities than aluminum. Panavia resin cement was shown to be similarly radiopaque to aluminum. Generally, the radiopacity of base and filling materials appeared to be higher than that of the enamel and dentin. If materials with substantial difference in radiopacity are used in combined applications for restorative treatment of teeth, lower radiopacity can interfere with the diagnosis and detection of gaps near the restoration.

수도권 매립지의 매립가스 발생량 예측과 활용방안 연구

신철호,오송열,김래현 서울産業大學校 2005 논문집 Vol.54 No.4

수도권 매립지에서의 매립가스 발생량 평가를 위해 국내에 적용되었었던 몇 개의 모델을 사용한 결과 SCS model과 국가 온실가스 배출량 조사에 사용되었던 모델이 실제 포집하여 사용했던 양과 비교하였을 때 가장 유사한 결과를 나타내었다. 수도권 매립지의 경우 플라스틱, 합성고무 등 유기성 폐기물이 상당수 존재하기 때문에 예상했던 것 보다 매립가스의 생성속도가 느린 것으로 나타났다. 또한 매립지의 활용방안에 있어서도 기존의 매립장 포화 후 후속 매립장의 운영하는 방안보다, 단계적으로 매립장을 병행 운영하는 방안을 통해 매립가스의 원활한 수습과 매립지의 수명연장에 있어 보다 효율적인 것으로 나타났다.

圓光醫大 附屬 第2病院 神經精神科 患者에 對한 統計的 考察(Ⅱ)

박민철,장광철,김상원,김한주,유미경,김훈,유용진,김현정,박남진,오상우,이귀행,노승호,백영석 圓光大學校 醫科大學 神經精神科學敎室 1992 圓光精神醫學 Vol.8 No.1

본 연구는 1986년 7월 11일부터 1991년 7월 10일까지 원광의대 부속 제2병원 신경정신과에서 의래 및 입원치료를 받았던 6,072명의 환자를 대상으로 병원 역학조사를 실시하고 그 결과를 1차조사 (박민철 등1986)와 비교했다. 1.전체 환자 중 남자가 54.4%로 여자보다 많았고, 이리와 이리 인접지역이 84.0%로 대부분의 지역을 나타났다. 의료보장상태는 보험환자가 57.1%, 의료보호환자21.8%, 일반환자 21.1%였으며 연령별로는 20대 24.6%, 30대 22.8%로 20대 30대가 절반정도를 차지했다. 2.외래환자에서는 신경중성장애가 46.0%로 가장 많고 정동장애, 경련성장애 순이며, 입원환자에서는 정신분열증이 30.5%로 가장 많고 기질성정신장애, 정동장애의 순이었다. 3.남자는 신경증성쟝애(23.4%), 정신분열증, 기질성정신장애 순이고 여자는 신경증성장애(39.9%), 정동장애, 정신분열증의 순이었다. 남자가 여자보다 많은 진단은 알코올정신장애(94.6%), 기질성정신장애, 소아정신장애 순이고, 여자가 남자보다 많은 진단은 정동장애(64.5%), 신경증성장애였다. 4.진단별 연령분포에서 신경증성장에는 30대(25.3%), 20대, 40대 순이고, 정신분열증은 20대(40.5%), 30대, 40대 순이며, 정동장애는 20대, 30대, 50대 순이나 비교적 비슷한 융이었다. 5.진단별 발병연령에서 신경증성장에는 20대, 30대가 절반이고,정신분열증은 20대(51.3%), 10대, 30대 순이며 정동장애는 20대(30.7%), 30대, 50대 순이었다. 진단별 평균 발병연령은 신경증성장애 32.7세, 정동장애 36.1세, 정신분열증 23.6세였다. 6.진단별 이병기간은 2년이상이 신경증성장에 28.3%, 정신분열증 68.5% 정동장애 43.9%인데 전체적으로 41.0%였다. 진단별 평균 이병기간은 정신분열증 73.2개월, 정동장애 45.5개월, 신경증성장애 29.5개월이었다. We examined epidemiologic study of 6,072 patients who visited Wonkwang Neuropsychiatric hospital since July 11 of 1986 until July 10 of 1991 and compared this results with previous study(Park et al 1986). The study revealed as follows:1. Of total patients males visited this hosptial more than females as 57.1%, Most of them(84.0%) resided Iri and neighbouring Iri. In the point of insurance, insured patients, medicaid patients and uninsured patients were 57.1%, 21.8% and 21.1% respectively. On the distribution of age, the twenties, the thirties were 24.6%, 22.8% respectively and twenties and thirties were about half of total patients. 2. Of outpatients neurotic disorder was the most as 46.0%, secondly mood disorder and thirdly convulsive disorder, but of inpatients schizophrenia was the most as 30.5%, secondly organic mental disorder and thirdly mood disorder. 3. Of males neurotic disorder was the most as 23.4%, secondly schizophrenia, and thirdly organic mental disorder, but of females neurotic disorder was the most as 39.9%, secondly mood disorder and thirdly schizophrenia. alcoholic mental disorder(94.6%), organic mental disorder, child mental disorder were mostly found in males,but mood disorder(64.5%) and neurotic disorder were mostly found in females. 4. On the distribution of age neurotic disorder was found the most in the thirties(25.3%), next in the twenties and in the forties, and schizophrenia was found the most in the twenties(40.5%), next in the thirties and in the forties, but mood disorder was found the most in the twenties, next in the thirties and in the forties but revealed similar rates relatively. 5. On the distribution of age of onset neurotic disorder developed nearly half during the twrnties and the thirties, schizophrenia developed mostly during the twenties (51.3%), secondly the teens and thirdly the thirties, but mood disorder developed firstly the twenties(30.7%), secondly the thirties and thirdly the fifties. on the average age of onset of illness neurotic disorder, mood disorder and schizophrenia were 32.7 years, 36.1 years and 23.6 years respectively. 6. On the duration of illness more than two years was 28.3% in neurotic disorder, 68.5% in schizophrenia and 3.9% in mood disorder and on the average duration of illness schizophrenia, mood disorder and neurotic disorder were 73.2 months, 45.5 months and 29.5 months respectively.

다양한 기준응답 데이터를 이용한 디지탈 PID 제어기의 파라미터 결정 방법

김윤상,오현철,안비오,안두수 成均館大學校 科學技術硏究所 1998 論文集 Vol.49 No.2

This paper presents an efficient algorithm which determines the parameters of digital PID controller. The proposed algorithm is an algebraic method to obtain controller parameters using various reference responses data, which makes design procedure general as well as straightfoward. Simple examples are given to demonstrate the effectiveness of our method with respect to various reference responses data.