악관절 강직증에 관한 임상적 연구

민병일,송민석 大韓顎顔面成形再建外科學會 1995 Maxillofacial Plastic Reconstructive Surgery Vol.17 No.1

Temporomandibular joint ankylosis is the movemental obstacle of mandible which depend on proliferation of bony or fibrous tissue in temporomandibular joint structure by various causes. In order to treat this, various surgical methods have been performed, but no operative methods have been produced consistently successful results. This research has been performed to the patients who had been operated due to temporomandibular joint ankylosis by studying classification, cause, onset, duration, anesthesia and treatment method, symptom, change of mouth opening, complication through medical record, X-ray, follow-up for being a help to proper selection of treatment method and evaluation of prognosis. The author obtained the following results by analyzing 44 cases among patients who had been operated due to temporomandibular joint ankylosis during 8 year hospitalization from 1986 to 1993 in Dept. of Oral & Maxillofacial Surgery of Seoul National University Hospital. 1. The occurrence was in the order of below 10, 20's, 10's, 30's. The average of occurrence was 12.95. Illness period was 50.0% within 10 years and 50% beyond 10 years. The average period of illness was 13.33 years. 2. Trauma occupied 54.5% of causes and inflammation occupied 45.5%. Men had more occurrences due to trauma and there was no difference in case of inflammation. 3. In nasotracheal intubations for general anesthesia, the cases of using fiberoptic larygoscope occupied 40.9%, direct or blind nasotracheal intubation occupied 40.9% and the cases of using tracheostomy occupied 18.2%. 4. In operative approaching methods, submandibular & preauricular approach were mainly applied, and in operative methods, high condylectomy(Group I) occupied 11.4%, arthroplasty without interpositional material following condylectomy or gap ostectomy(Group Ⅱ) occupied 11.4%, with interpositional material following high condylectomy (Group Ⅲ) occupied 40.9%, and using condylar reconstruction following condylectomy or gap ostectomy(Group Ⅳ) occupied 36.6%. 5. In change of mouth opening reformed after surgery, Group Ⅲ showed the best result of average 23.5mm, Group Ⅳ showed 16.3mm, Group Ⅰ showed 14.9mm and Group Ⅱ showed 10.2mm of reformation. Summarizing the results as written above, it is considered that early treatment is important as soon as possible in Temporomandibular joint ankylosis. It is recommended in surgical method what can lead to postoperative early movement maintaining anatomaical & functional form, and then the development of various surgical methods will be requested.

A Novel Method of Determining Parameters of CLAHE Based on Image Entropy

Min, Byong Seok,Lim, Dong Kyun,Kim, Seung Jong,Lee, Joo Heung Global Vision Press 2013 International Journal of Software Engineering and Vol.7 No.5

A Novel Method of Determining Parameters of CLAHE Based on Image Entropy

Byong Seok Min,Dong Kyun Lim,Seung Jong Kim,Joo Heung Lee 보안공학연구지원센터 2013 International Journal of Software Engineering and Vol.7 No.5

Synthesis of the Molybdenum Precursor for Slurry-Phase Hydrocracking of Heavy Oil

Choi, Byong-Min,Son, Seok-Hwan,Noh, Min-Sub,Lee, Kwang-Seok,Lee, Chul-Wee,Park, Sun-Yeong,Chung, Min-Chul American Scientific Publishers 2018 Journal of Nanoscience and Nanotechnology Vol.18 No.2

<P>In this study, Molybdenum precursors were synthesized with butanoic acid, hexanoic acid, nonanoic acid, decanoic acid, and undecanoic acid. In order to determine chemical structure of Synthesized molybdenum precursors, H-1(C-13)-NMR, EA and ICP were used pyrolysis properties were measured TGA. The molybdenum precursors was used for Hydrocracking of Vacuum R(1)esidue (VR). It was shown that molybdenum nonanoate(3) was shown the lowerst Toluene Insoluble and Gas Product about 2.1 and 5.0 percent.</P>

대비제한 적응 히스토그램 평활화에서 매개변수 결정방법

민병석(Min, Byong-Seok),조태경(Cho Tae-kyung) 한국산학기술학회 2013 한국산학기술학회논문지 Vol.14 No.3

히스토그램 평활화는 영상의 밝기 분포를 변화시킴으로써 화질을 향상시키는 방법으로 다양한 분야에서 응 용되고 있다. 전역적인 방법은 영상 밝기의 전체적인 분포를 균등 분포로 변환함으로써 영상의 밝기가 과도하게 변하 는 단점을 갖고 있다. 이를 해결하기 위한 방법으로 K. Zuierveld가 제안한 대비 제한 적응 히스토그램 평활화 (CLAHE)가 실용적으로 널리 사용되고 있다. 이 방법에서는 블록단위의 처리를 위한 블록 크기와 대비 제한을 위한 매개변수 등 두 개의 매개변수가 히스토그램의 평활화 성능을 결정하는데, 이것들을 결정하는 구체적인 알고리듬은 없으며 실험적으로 시행착오학습 통해 결정한다. 본 논문에서는 영상의 엔트로피에 기반해서 CLAHE의 매개변수인 블록 크기와 대비제한 매개변수를 결정하는 새로운 방법을 제안한다. 제안한 방법은 CLAHE를 자동화할 수 있으며, 전체적으로 어두운 영상이나 밝은 영상에 적용한 결과 전역적인 방법에 비해 주관적 화질 개선의 효과를 나타내었다. Histogram equalization, which stretches the dynamic range of intensity, is the most common method for enhancing the contrast of image. Contrast limited adaptive histogram equalization(CLAHE), proposed by K. Zuierveld, has two key parameters: block size and clip limit. These parameters mainly control image quality, but have been heuristically determined by user. In this paper, we propose a novel method of determining two parameters of CLAHE using entropy of image. The key idea is based on the characteristics of entropy curves: clip limit vs entropy and block size vs entropy. Clip limit and block size are determined at the point with maximum curvature on entropy curve. Experimental results show that the proposed method improves images with very low contrast.

얼굴 영상에서 망진을 위한 오관기관 및 명당 부위의 추출

민병석(Min, Byong-Seok),조동욱(Cho, Dong-Uk) 한국산학기술학회 2006 한국산학기술학회논문지 Vol.7 No.6

다양한 의료진단 자동화 기기들이 개발되고 있으나 대부분 서양의학에 집중되어 있는 현실이고, 한의학의 진단시 자동화 및 정량화를 위한 장치 개발은 미미하다. 한편, 한의학에서의 네가지 진단 방법 증 하나인 망진은 환자의 관형과 찰색을 통해 질병의 유무와 경중을 진단한다. 망진을 시행할 때 얼굴에서 이목구비와 명당 부위의 상태가 특히 중요하다. 본 논문에서는 얼굴 영상으로부터 망진을 위한 얼굴 요소들을 추출하기 위한 방법을 제안하고, 남여 얼굴 영상에 대한 실험을 통해 제안한 방법의 유용성을 보이고자 한다. Many automatic medical devices have been invented and developed mostly for the western medicine, not for the oriental medicine. Facial ocular inspection is one of the four diagnosis methods of oriental medicine, which makes a diagnosis of disease by observing the shape and color of patient’s vital organs. In facial ocular inspection, the regions of five sensory organs and Myungdang are specially important. In this paper, we propose a novel method to extract the five sensory organ and Myungdang from a facial image for facial ocular inspection. Finally, we show the usefulness of the proposed method by experiments.

Enhancement of Wavelet-coded Image by Directional Filtering

민병석(Min, Byong-Seok),김승종(Kim, Seung-Jong),임동균(Lim, Dong-Kyun) 한국산학기술학회 2007 한국산학기술학회논문지 Vol.8 No.2

멀티미디어 응용분야에서 영상 압축부호화는 영상의 데이터량을 줄이기 위해 필수적이다. 그러나 이러한 압축부호화는 화질의 열화를 발생시킨다. 블록킹 현상과 모기 잡음은 이산여현변환 기반의 압축 영상에서 전형적인 열화이고, 에지 주변의 링잉 현상은 웨이블릿 기반의 압축영상에서 발생한다. 본 논문에서는 방향성을 고려한 후처리 방법을 제안하고자 한다. 제안하는 방법은 복호된 화질의 개선을 위해 에지의 방향 검출과 보간법, 방향성 비선형 필터링을 포함한다. 다양한 영상에 대해 시험한 결과, 제안된 방법이 다른 비선형 필터 방법에 비해 우수한 성능을 나타내었다. In many multimedia applications, image compression is required to substantially reduce the amount of image data. This compression, however, sometimes brings artifacts. Typical artifacts are blocking artifacts and mosquito noise in DCT-coded images, and ringing artifacts around edges in wavelet-coded images. We propose a new directional postprocessing algorithm, which includes detection of the edge direction, interpolation scheme, and directional nonlinear filtering, to enhance the quality of decoded images. Simulation results show that the proposed algorithm is as effective as or more effective than other nonlinear filtering techniques.

히스토그램 매칭에 기반한 적응적 히스토그램 균등화

민병석(Min, Byong-Seok) 한국산학기술학회 2006 한국산학기술학회논문지 Vol.7 No.6

영상의 화질을 개선하기 위한 많은 방법 중 비교적 간단하게 사용되는 방법 중 하나는 영상의 대비를 조절 하는 것이다. 이러한 대비를 조절하는 방법 중 하나인 히스토그램 균등화는 영상 계조도 값의 분포를 균등 분포로 변환함으로써 화질을 개선한다. 그러나, 기존의 방법은 영상의 히스토그램 분포가 몇 개의 계조도 값에 군집화 되어 있다. 면 영상의 계조도가 과도하게 변하는 단점을 갖는다. 본 논문은 그레이스케일 영상에 대해 히스토그램의 형태를 고려해서 가우시안 함수에 기반한 히스토그램 매청 방법을 제안한다. 제안된 방법은 영상이 과도하게 밝아지는 것을 제한하고 히스토그램의 분포가 몇 개의 계조도에 군집화 되어 있는 영상에서의 에지 및 어두운 부분의 자세한 정보를 표현하는데 우수한 성능을 나타내었다. The contrast control of images with narrow dynamic range is a simple method among enhancement methods for low intensity of image. Histogram equalization is the most common method for this purpose, which stretches the dynamic range of intensity. Conventional methods would fail to enhance images with extremely dark and bright regions, because of not considering the shape of histogram. In this paper, we propose a novel adaptive histogram equalization based on histogram matching with multiple Gaussian transformation function. As a result, output images with a couple of peaks of histogram could be improved and the details such as edges in dark regions could be appeared better than conventional method subjectively.

Cellulose Acetate막을 이용한 해수 담수화에 관한 연구

민병렬,이광현,이종석 연세대학교 대학원 1988 延世論叢 Vol.24 No.-

This study is concerned with the effect of feed concentration, temperature and pressure difference across the membrane on the transport of solvent and solute through Cellulose Acetate membrane. Total volume flux, J_??, increases with increase of temperature. However rejection coefficient, R, is invariant with the temperature. Increase in pressure difference across the membrane causes increase in rejection coefficient, total volume flux increases linearly with increase in the effective pressure difference across the membrane(??P-??II). This empirical study indicates that it is possible to achieve higher efficiency in desalination by Reverse Osmosis at higher temperature, higher pressure difference across the membrane and lower feed concentration. The solute transport data follow Pusch's linear model which predicts the linear relationship between inverse of rejection coefficient and inverse of total volume flux. Most of data follow solution-diffusion model which predicts the intercept, A, from Pusch's equation equal to unity.

Effect of Angiotensin I-Converting Enzyme (ACE) Inhibitory Peptide Purified from Enzymatic Hydrolysates of Styela plicata

Seok-Chun Ko,Min Cheol Kang,Jung-Kwon Lee,Hee-Guk Byun,Se-Kwon Kim,Seung-Cheol Lee,Byong-Tae Jeon,Pyo-Jam Park,Won-Kyo Jung,You-Jin Jeon 한국식품영양과학회 2011 한국식품영양과학회 학술대회발표집 Vol.2011 No.10