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기능적 문제가 없는 성인 가성 탑상두개의 외과적 교정: 증례 보고
서영민,정승문 대한성형외과학회 2003 Archives of Plastic Surgery Vol.30 No.1
Oxycephaly, which is a frontal deformity in which the forehead is recessed and tilted backwards, is usually caused by the premature fusion of mainly the coronal and sagittal suture. In 1926, David M. Greig proposed to classify oxycephaly into three different forms; true oxycephaly, delayed oxycephaly and false oxycephaly. False oxycephaly is a simple morphotype of the skull without any clinical symptoms which does not affect the brain in any way. Surgical repair of oxycephaly for adults can include cosmetic considerations and the prevention or possible improvement of functional symptoms such as headaches, vomiting and visual disturbance. Furthermore, in adults who does not have any functional problems, cosmetic surgery can be done. But oxycephaly of adult patients need more complex and extensive surgical interventions than that of infant patients. A-21-year-old male who had a retroverted forehead, pointed head and a flat fronto-nasal angle, without any functional problems, was treated by a fronto- orbital advancement and a transposition between the frontal and fronto-parietal bone. This method provided us with a good frontonasal angle and a gently backward sloping forehead above the supraorbital bar. An acceptable aesthetic appearance was achieved 6 months after the operation. This remodeling technique is adequate for resolving the aesthetic problems of adult false oxycephalic patients who does not have any functional problems.
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영화 음악을 활용한 유아음악활동의 협력적 실행과정과 교사와 유아의 변화
서영민,정지혜 한국어린이미디어학회 2018 어린이미디어연구 Vol.17 No.4
This study is a collaborative action research by researchers and teachers about the educational application of cinematic music that is usually dismissed by kindergartens on music activity. Data was based on filed video and field work reports, and analyzed qualitatively. Cinematic music used in music activities were played by projecting the soundtrack “BANG BANG” from the film “Great Expectations” and “Mission Impossible” from the film “Mission Impossible” on a wall. The action research was performed by kindergartens on music activity for 3 cycles. Through the process of this study, we instircpected collaborative action research and analyzed change of teacher and children. Study results indicated teacher showed pleasure in teaching music activity. Through the process teacher concretely explored about musical and motional elements. Also they recognized diversity of media in music education for children. They showed interest in beat with distinct feature of the cinematic music, resulting in a knowing phrase in music and were immersed in cinematic music. In conclusion, this study became the basis for invigorating the current kindergarten teaching environment by introducing a new method of teaching music. The need for a wide variety of media to teach and learn through music was recognized, and teaching methods for musical activities became more open and flexible. 본 연구의 목적은 유아교육기관에서 영화음악을 활용한 유아음악활동의 협력적 실행연구의 과정과 교사와 유아의 변화를 알아보는 것이다. 이를 위하여 동영상 촬영 및 현장관찰일지를 바탕으로 기록하였고 분석하였다. 만3세 유아 15명을 대상으로 영화 [위대한 개츠비]의 음악 ‘BANG BANG’과 [미션 임파서블]의 음악 ‘Mission impossible’을 활용하여 3차에 걸친 유아음악활동을 실행하였다. 이 과정을 통해 나타난 협력적 실행과정을 성찰해보고 교사와 유아의 변화를 알아보고자 하였다. 연구 결과, 교사는 협력적 실행과정을 통해 음악활동 지도의 즐거움을 알게 되었으며 이 과정에서 음악적, 동작 요소에 대하여 구체적으로 탐색하고, 음악교수학습 매체의 다양성에 대한 필요성을 인식하였다. 유아는 영화음악의 특색 중 두드림의 즐거움을 느꼈고 유아들의 춤에서 프레이즈를 발견하였으며 음악에 몰입하였다. 본 연구는 음악교육에 있어 한정된 교수 학습 매체만을 사용하는 유아교육현장에 새로운 교수학습매체 활성화하는 토대를 제공하여 유아교육 현장의 음악활동을 개선하는데 의의가 있다.
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인공신경망과 크리깅 결합모델을 이용한 지하수위 공간분포추정
서영민,이병준,최윤영 한국환경기술학회 2020 한국환경기술학회지 Vol.21 No.1
This study proposes the conjunction models of artificial neural network and residual kriging (ANNRK) for estimating the spatial distribution of groundwater level in the Nakdong River Basin, South Korea. The models’ performances are evaluated based on statistical performance indices and graphical comparison and compared with those of inverse distance weighting (IDW), Spline, simple kriging (SK), ordinary kriging (OK), universal kriging (UK) and regression kriging (RK). As a result, kriging and ANNRK models yield better results for spatial groundwater prediction than IDW and Spline models. The RK and ANNRK models with ground surface elevation as the auxiliary information produce significantly better performance compared with other models. Among all models, ANNRK-EXP model achieved the best performance in terms of model performance indices and graphical comparison. Therefore, these results indicate that introducing ground surface elevation as a topographical factor to spatial prediction models can improve the performance of spatial prediction significantly. Furthermore, ANNRK model coupling ANN and residual kriging can be an effective alternative for estimating the spatial distribution of groundwater level accurately.
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견인전동기 구동시스템의 소음 저감을 위한 MRSF -PWM 방식
서영민 전력전자학회 2002 전력전자학회 논문지 Vol.7 No.3
In PWM inverters used in traction motor drive systems, the switching frequency is restricted by their large power capacity and thus the electromagnetic acoustic noise is generated. To reduce such an audible noise, the new MRSF-PWM(Modified Random Switching Frequency PWM) method is proposed. In the proposed MRSF- -PWM method, both triangular wave and sawtooth wave are used together as carrier waves for harmonic diffusion and reference wave is generated by injecting 3rd harmonic into the sine wave to expand the linear control region of output voltages. To verify the validity of the proposed MRSF-PWM method, computer simulations are carried out. And the results show that the MRSF-PWM method is more excellent than other RPWM methods in the aspects of both linearity and harmonic diffusion and more effective than SPWM (Sinusoidal PWM) method for the reduction of an audible noise. 견인전동기 구동시스템에 사용되는 PWM 인버터는 전력용량이 크기 때문에 스위칭주파수가 제한되며, 따라서 전자기적 가청소음이 발생한다. 이러한 가청소음을 줄이기 위하여 새로운 MRSF-PWM 방식을 제안한다. 제안한 MRSF-PWM 방식에서는 고조파를 확산시키기 위해 삼각파와 톱니파를 함께 운송파로 사용하며, 출력전압의 선형제어범위를 넓히기 위해 정현파에 3차 고조파를 주입한 파형을 기준파로 사용한다. MRSF-PWM 방식의 타당성을 검증하기 위하여 컴퓨터 시뮬레이션을 수행하였다. 그 결과, MRSF-PWM 방식이 선형성 및 고조파 확산면에서 다른 RPWM 방식보다 우수하며 가청소음 저감면에서 SPWM 방식보다 효과적임을 확인하였다.
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