반안면 왜소증 환자의 악골교정술과 골, 진피지방의 동시 이식을 통한 안면부 교정 치험례

최희윤,박봉권,최봉근,안희창,안덕균,류재만 大韓成形外科學會 1999 Archives of Plastic Surgery Vol.26 No.3

Hemifacial microsomia is a common congenital craniofacial deformity involving bone and soft-tissue. Mandibular hypoplasia is the most obvious skeletal manifestation of hemifacial microsomia. In the past, complete realignment of the skeleton was preferred to soft-tissue correction, which was clearly second choice. However, in this study, simultaneous correction of bone and soft tissue deformities were equally important in treatment of hemifacial microsomia. One-stage and simultaneous bone and soft tissue reconstruction is possible and staged operations of the skeleton and soft tissue are no longer necessary, except in special cases. Even in children and adolescents, good results and normal growth potential can be achieved with simultaneous correction of bone and soft tissue.

全北大學校 開校 50周年 紀念公園 造成計劃에 관한 硏究

金世泉,崔萬峰,安得洙 全北大學校 1996 論文集 Vol.42 No.-

The objective of this study was to develop recommendations for designing a park in commemoration of Chonbuk National University's 50th anniversary. The study progressed in accordance with the design process and questionnaires were used to collect data on developing a program. The park is divided into three parts, with spaces for the past, present, and future. Water that flows through the spaces represents the stream of time. The facilities for two basic elements of life, work and relaxation, are located in both sides of the visual axis with asymmetric balance. From analyzing the existing topography and landscape character, proposed landforms and grade changes will be of varying construction. In some areas, the visual landscape will be emphasized. It will be negated elsewhere. The plantings will be used to achieve visual control and produce a diverse landscape which changes with the seasons. The monument, symbolic sculpture, and shelters are designed to represent the 50th anniversary of the university.

한국 주요정신장애의 유병률 및 관련요인 : 2006 전국정신질환역학조사

조맹제,장성만,함봉진,정인원,배안,이영문,안준호,원승희,손정우,홍진표,배재남,이동우,조성진,박종익,이준영,김진영,전홍진,이해우 大韓神經精神醫學會 2009 신경정신의학 Vol.48 No.3

Objectives The aims of this study are to estimate the prevalence of the DSM-IV psychiatric disorders in the Korean population using the Korean version of Composite International Diagnostic Interview (K-CIDI), and to compare those with previous studies. Methods The Korean Epidemiologic Catchment Area study Replication (KECA-R) was Conducted between August 2006 and April 2007. The sampling of the subjects was carried out across 12 catchment areas. A multistage, cluster sampling design was adopted. The target Population included all eligible residents aged 181o 64 years. Face-to-face interviews were conducted with the Korean version of Composite International Diagnostic Interview (K-CIDI) based on the DSM-IV (N=6,510, response rate=81.7%). Results A total of 6,510 participants completed the interview. The lifetime and 12-month prevalence rates for all types of DSM-IV disorders were 30.0% and 17.3%, respectively. Those of Specific disorders were as follows : 1) alcohol use disorder, 16.2% and 5.6% ; 2) nicotine use disorder, 9.0% and 6.0% ; 3) specific phobia, 3.8% and 3.4% ; 4) major depressive disorder, 5.6% and 2.5% ; and 5) generalized anxiety disorder, 1.6% and 0.8%. Data relating to nicotine and alcohol use disorder revealed a very high male/female ratio. Mood disorder and anxiety disorder were more prevalent among females than males. Conclusion The prevalence of psychiatric disorders was high. In comparison with other studies, remarkable differences in the distribution of psychiatric disorders across the country and times were observed.

등가의 Wiener-Hopf 방정식에 관한 연구

안봉만(Bong-Man Ahn),조주필(Juphil Cho) 한국통신학회 2008 韓國通信學會論文誌 Vol.33 No.9C

본 논문은 평균 자승 측면에서 직교 입력 신호에 대하여 TDL 필터의 계수를 구할 수 있는 등가의 Wiener-Hopf 방정식을 제안한다. 본 논문에서 제안한 등가의 Wiener-Hopf 방정식을 이용하면 직교 입력 신호에 대하여 역 직교화 과정을 거치지 않고 직접적으로 TDL 필터의 계수와 오차를 표현할 수 있다. 본 논문에는 MMSE(minimum mean square error)에 대한 이론적 해석을 포함하였으며 수학적 예제에서 Wiener-Hopf 해와 제안한 등가의 Wiener-Hopf 해를 동시에 나타내었다. This paper makes a research on the equivalent Wiener-Hopf equation which can obtain the coefficient of TDL filter on orthogonal input signal in terms of mean square error. Using this result, we can present the coefficient and error of TDL filter directly without inverse orthogonalization process on orthogonal input signal. We make a theoretical analysis on MMSE and show an Wiener-Hopf solution and the proposed equivalent one in mathematical example simultaneously.

적응 파라미터 예측을 위한 근사화된 RLS 알고리즘

안봉만(Bong-Man Ahn),황지원(JeeWon Hwang),유정래(Jung Rae Ryoo),조주필(Juphil Cho) 한국통신학회 2007 韓國通信學會論文誌 Vol.32 No.9

등가의 Wiener-Hopf 방정식을 이용한 LMS 알고리즘에 관한 연구

안봉만(Bong-Man Ahn),황지원(JeeWon Hwang),조주필(Juphil Cho) 한국통신학회 2008 韓國通信學會論文誌 Vol.33 No.5C

본 논문은 등가의 Wiener-Hopf 방정식의 해를 LMS 알고리즘을 이용하여 구할 수 있는 방법과 격자필터에서 직접적으로 TDL 필터의 계수를 구할 수 있는 방법을 제안한다. 이를 위해 격자필터를 이용하여 생성한 직교입력 신호를 등가의 Wiener-Hopf 방정식에 적용하여 그 해를 최소평균자승 알고리즘을 이용하여 순환적으로 구하는 방법을 보인다. 이와 같은 경우 기존에는 오차와 regression 계수를 순환적으로 구할 수 있는데 반하여 본 논문에서는 오차와 TDL 필터의 계수를 순환적으로 구할 수 있는 장점이 있다. 또한 제안한 알고리즘의 수렴적 특성을 이론적으로 고찰하였다. 그 결과는 전통적 해석과 유사하게 나타남을 알 수 있었다. 성능 평가 결과를 통해 제안한 알고리즘이 매우 우수한 성능을 나타내고 있음을 확인하였다. This paper presents the methods which obtain the solution of Wiener-Hopf equation by LMS algorithm and get the coefficient of TDL filter in lattice filter directly. For this result, we apply an orthogonal input signal generated by lattice filter into an equivalent Wiener-Hopf equation and shows the scheme that can obtain the solution by using the MMSE algorithm. Conventionally, the method like aforementioned scheme can get an error and regression coefficient recursively. However, in this paper, we can obtain an error and the coefficients of TDL filter recursively. And, we make an theoretical analysis on the convergence characteristics of the proposed algorithm. Then we can see that the result is similar to conventional analysis. Also, by computer simulation, we can make sure that the proposed algorithm has an excellent performance.

ESS의 전자 잡음 주파수 분석 및 제거

안봉만 ( Bong Man Ahn ),한병성 ( Byoung Sung Han ),한운기 ( Un Ki Han ),이영관 ( Young Kwan Lee ),안현진 ( Hyun Jin An ) 한국전기전자재료학회 2022 전기전자재료학회논문지 Vol.35 No.6

This paper is a study on frequency analysis and electronic noise reduction of energy storage system (ESS). We acquired 4 necessary data for about 2 minutes and 4 seconds using a sampling frequency of 10,000 Hz in ESS. Fast Fourier transform (FFT) was used for electronic noise analysis from the acquired data. As a result, it was confirmed that DC component, fundamental wave, second and higher harmonic component exist. For the attenuation of harmonics, low-pass filter (LPF) was applied. We confirmed that an attenuation of approximately 59.3% appears from the second harmonic. The presence of many harmonic components in the data of the ESS was expected to occur due to the insufficiency of optimization among the modules inside the ESS. Therefore, we propose that a national certification system for ESS should be introduced to settle down the issue properly.

정규화된 D-QR-RLS 알고리즘의 특성 분석(Ⅱ)

안봉만(Bong-Man Ahn),황지원(JeeWon Hwang),조주필(Juphil Cho) 한국통신학회 2007 韓國通信學會論文誌 Vol.32 No.11C

제안된 알고리즘은 QR 형태의 LMS 알고리즘이 입력의 분산에 비례하게 되어있어 입력의 분산을 평균적인 측면에서 입력의 분산을 정규화하는 알고리즘중 하나이다. 본 논문에는 정규화 알고리즘의 수렴 특성 분석이 되어있다. 제안한 알고리즘의 성능분석을 위하여 간단한 FIR 시스템의 시스템 식별을 수행하였다. 이때 성능 비교에 참여한 알고리즘은 LMS, NLMS(normalized least mean square) 알고리즘이다. 그 결과 제안한 알고리즘은 NLMS 알고리즘과 매우 유사한 성능을 가짐을 확인하였다. This paper proposes one of normalized QR-typed LMS (Least Mean Square) algorithms with computational complexity of O(N). This proposed algorithm shows the normalized property in terms of theoretical characteristics. This proposed algorithm is one of algorithms which normalize variance of input signal in terms of mean because QR-typed LMS is proportional to variance of input signal. In this paper, convergence characteristic analysis of normalized algorithm was made. Computer simulation was made by the algorithms used for echo canceller. Proposed algorithm has similar performance to theoretical value. And, we can see that proposed method shows similar one to performance of NLMS.by comparison among different algorithms.

등가의 Wiener-Hopf 방정식을 이용한 수정된 Gram-Schmidt 알고리즘

안봉만(Bong-Man Ahn),황지원(JeeWon Hwang),조주필(Juphil Cho) 한국통신학회 2008 韓國通信學會論文誌 Vol.33 No.7C

본 논문에서는 Gram-Schmidt 알고리즘에서 TDL(Tapped Delay Line) 필터의 계수를 구하는 방법과 등가의 Wiener-Hopf 방식의 해를 구하는 방법 중 정규화 알고리즘 두 가지를 제안한다. 이론적 해석에서 기존의 NLMS(Normalized Least Mean Square) 알고리즘이 입력의 파워의 합으로 정규화하는 것에 비해 제안한 정규화 알고리즘들은 고유값들의 합으로 정규화한다. 컴퓨터 모의실험에서 두 개의 pole이 단위원 밖의 근접한 위치를 가지는 불안정한 환경에서 시스템 식별을 수행하였다. 결과적으로, 제안한 두 개의 알고리즘은 Gram-Schmidt 알고리즘에서 TDL 필터의 계수를 회귀적으로 구할 수 있었고 기존의 NLMS 알고리즘에 비하여 우수한 수렴 성능을 나타냄을 알 수 있었다. This paper proposes the scheme which obtain the coefficients of TDL filter and two normalization algorithms among methods which get solution of equivalent Wiener-Hopf Equation in Gram-Schmidt algorithm. Compared to the conventional NLMS algorithm, normalizes with sum of power of inputs, the presented algorithms normalize using sums of eigenvalues. Using computer simulation, we perform an system identification in an unstable environment where two poles are located in near position outside unit circle. Consequently, the proposed algorithms get the coefficients of TDL filter in Gram-Schmidt algorithm recursively and show better convergence performance than conventional NLMS algorithm.

선가력 후 휨 보강한 RC 슬래브의 유효 휨강성 평가

안기만(Ahn, Ki Man),김광수(Kim, Kwang Soo),김태완(Kim, Tae Wan),한경봉(Han, Kyung Bong),박선규(Park, Sun Kyu),이영재(Lee, Young Jae) 한국콘크리트학회 2007 한국콘크리트학회 학술대회 논문집 Vol.2007 No.11