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측두하악관절 장애 환자의 임상증상과 자기공명영상에 관한 비교 연구
최용석,황의환,이상래,Choi Yong-Suk,Hwang Eui-Hwan,Lee Sang-Rae 대한영상치의학회 2003 Imaging Science in Dentistry Vol.33 No.2
Purpose : To determine the relationship between clinical symptoms and magnetic resoncance (MR) images in patients presenting with temoporomandibular joint (TMJ) disorders. Materials and Methods: This study was based on 172 joints in 86 patients presenting with TMJ disorders. Joint pain and sound during jaw opening and closing movements were recorded, and the possible relationship between disc positions and bony changes of the condylar head and the articular fossa in MR images in the oblique sagittal planes were examined. Data were analyzed by Chi-square test. Results : There was no statistically significant relationship between clinical symptoms and MR images in the patients with TMJ disorders. Conclusion: In the patient with TMJ disorders, joint pain and sound could not be specific clinical symptoms that are related with MR image findings, and asymptomatic joints did not necessarily imply that the joints are normal according to MR image findings.
최용석,황인수,이경주,나미숙,박덕기,서화영,Choi, Yong-Seok,Whang, In-Su,Lee, Gyung-Ju,Na, Mi-Suk,Park, Deog-Kee,Seo, Hwa-Young 한국응용곤충학회 2018 한국응용곤충학회지 Vol.57 No.4
We surveyed branches of acacia trees distributed nationally in Korea to establish a common survey method that can be used by investigators to monitor for over-wintering Metcalfa pruinosa eggs. A total of 189 samples was examined, and the number of eggs on the surfaces of the branches, bases of thorns and bases of twigs was recored. When including samples in which no eggs were found at all investigation sites, none of the data followed the normal distribution. However, when samples in which no eggs were found at all sites were exclued, the density of eggs investigated at the thorn bases and twig bases followed the normal distribution. When the density of eggs was sorted based on the thickness of the branches on which they were found, these data did not follow the normal distribution. The density of M. pruinosa eggs at the thorn bases and twig bases was significantly higher than that on the branch surfaces, but there was no significant difference among branches of different thicknesses. Therefore, monitoring for M. pruinosa eggs at the thorn bases and twig bases of the nationally distributed acacia tree, irrespective of the thickness of the branches, will be able to increase the precision with which the density of this insect's eggs could be estimated. It is thus expected that this method will contribute to developing methods to better characterize the distribution and predict the occurrence of this. 우리는 미국선녀벌레의 월동알 조사를 하는데 있어 조사자의 공통된 조사방법을 제시하고자 전국적으로 분포하는 아카시나무의 가지를 부위별로 조사하였다. 조사한 총 표본수는 189개 샘플이었고 가지는 가시밑둥, 잔가지밑둥, 가지표면 세부분으로 나누어 알을 조사하였다. 모든 부위에서 알이 존재하지 않는 샘플을 포함했을 때는 모두 정규분포를 따르지 않았으나 알이 존재하지 않는 샘플을 제외했을 때는 가지밑둥과 잔가지밑둥에서 조사된 알은 정규분포를 따랐다. 가지의 굵기에 대한 정규성 정도는 없었다. 가지밑둥과 잔가지밑둥에서의 미국선녀벌레 알의 밀도는 가지표면에서 보다 유의성 있게 높은 밀도를 보여주었고 가지의 굵기별 조사에서는 유의성이 없었다. 따라서 미국선녀벌레가 주로 산란하는 아카시나무는 전국적으로 분포하고 있는 수종으로 아카시나무 가지의 굵기와 상관없이 가시밑둥과 잔가지밑둥에서 미국선녀벌레 알을 조사하는 것이 밀도 추정의 정밀도를 높여 정확한 한반도 분포 특성과 발생예측을 위한 조사방법으로 크게 기여할 것으로 판단된다.
최용석,임성빈,정진형,Choi, Yong-Suk,Yim, Sung-Bin,Chung, Chin-Hyung 대한치주과학회 1995 Journal of Periodontal & Implant Science Vol.25 No.1
A mucogingival grafting procedure has been developed to cover denuded root surfaces. The subepithelial connective tissue graft is composed of a free connective tissue graft and an overlying pedicle graft. The source of connective tissue graft were trap door approach and thining of a full thickness palatal flap. The purpose of this study was compare a two different connective tissue obtaining method. In this study, where palatal pocket was present, pocket elimination was performed, and the tissue normally discarded after thinning of the palatal flap was used as a grafting material. The results were as follows : 1. The mean difference between trap door approach and thinning procedure for root coverage were $2.1{\pm}O.lmm$, $2.2{\pm}O.2mm$. 2. The mean difference between trap door approach and thinning procedure for pocket depth change were $O.2{\pm}O.lmm$, $O.2{\pm}O.2mm$. 3. The mean difference between trap door approach and thinning procedure for attachment gain were $2.1{\pm}O.2mm$, $2.4{\pm}O.2mm$. 4. The esthetics in recipient site, both color match and tissue contour, were acceptable to the patient in all cases. 5. Therefore, thinning procedure were similar to trap door approach in root coverage effect.
폐변압기 절연유 중 PCBs 분석을 위한 전처리 방법 비교
최용석 ( Yong Suk Choi ),윤중섭 ( Jung Seop Yoon ),엄석원 ( Seok Won Eom ),김민영 ( Min Young Kim ),안승구 ( Seoung Gu Ahn ) 한국환경분석학회 2010 환경분석과 독성보건 Vol.13 No.3
Transformer oil is usually a highly-refined mineral oil that is stable at high temperatures and has an excellent electrical insulating property. Polychlorinated biphenyls(PCBs) had been widely used as transformer oil before the use of PCBs was banned throughout world in 1970s. Therefore PCBs is not used as transformer oil or insulating oil any more, but sometimes they have been found in transformer oil. It is difficult to separate and quantify PCBs in transformer oil because chemo-physical characteristics between PCBs and transformer oil are very similar. Lately, various solid phase extraction(SPE) methods are adopted for rapid and simple separation of PCBs but it is still hard to perfectly extract PCBs from transformer oil and loss during this extraction/cleanup process can cause a recovery problem. The aim of this study is to find an easy method for PCBs determination in transformer oil and to verify its efficiency. We applied various pretreatment methods to extract PCBs determination in transformer oil and compared with their efficiencies: laborious treatment including sulfur treatment, multilayer silica gel column and so forth, SPE method and simple treatment such as just dilution of transformer oil. For the majority of transformer oils with few impurities, large differences of PCBs between methods could not be found.
최용석(Yong Suk Choi),서유경(Yoo Kyung Seo),강주희(Ju Hee Kang),오송희(Song Hee Oh),김규태(Gyu Tae Kim),황의환(Eui Hwan Hwang) 대한치과의사협회 2017 대한치과의사협회지 Vol.55 No.11
Ultrasound sonography(US) is used to evaluate various diseases of oral and maxillofacial region including salivary glands, soft tissue and jaw lesions because of easy accessibility and no hazard of ionizing radiation. Also, US can offer dynamic study showing real-time images during diagnostic or surgical procedure. US images provide accurate information about the internal features of lesions on the jaw prior to surgical treatment. Doppler images are used to visualize the vascular distribution of the lesions and to provide additional information to enhance diagnostic value. It is necessary to evaluate the diagnostic value of US and evaluate its usefulness by looking at clinical cases using US images. Therefore, US imaging may be recommended as an assistant image in evaluating jaw lesions. US images provided accurate information about the internal structure of lesions on the jaw prior to surgical treatment, and diagnostic value was enhanced by visualizing the vascular distribution of the lesion using doppler imaging. We report the protocol and suggest the effectiveness of US for various lesions and US-guided sialography.
추상화 메모리 문맥을 이용한 바이너리 코드기반 표절 탐지
최용석(Yong Suk Choi),최종무(Jong Moo Choi) 한국정보과학회 2013 정보과학회 컴퓨팅의 실제 논문지 Vol.19 No.7
최근 소프트웨어 표절 문제로 지적재산권 보호에 대한 관심이 높아졌지만 코드 난독화 같은 표절 방법이 다양해지면서 대응이 어려워지고 있다. 기존의 정적 표절 분석 도구들은 내용기반 분석들로 코드의 형태 변화에 취약하며 의미 기반의 난독화 기법으로 코드를 변형할 경우 표절 검색에 실패할 확률이 높다. 본 논문에서 제안하는 기법은 바이너리 코드만 존재하는 상황에서 정적과 동적 분석기법의 장점을 통합, 의미기반 분석과정을 통해 효과적인 표절위치 탐색 기법을 제시한다. 논문에서 제안하는 도구의 구조는 크게 표절 범위 추적, 동적 메모리 변화 정보 수집, 추상화 메모리 문맥 변환, 마지막으로 추상화 메모리 정보기반 표절 분석으로 나뉜다. 제안된 기법은 x86기반 리눅스 환경에서 실험되었으며 원본과 표절 바이너리 실행파일을 입력으로 하였고 다양한 코드 난독화 시도에도 기존 기법에 비해 표절되어진 위치를 효과적으로 탐색한다. There has been increasingly interest in the protection of the intellectual property right due to the software plagiarism being issued recently. Nevertheless, it becomes difficult to cope with such problem because of the appearance of a variety of plagiarism methods such as code obfuscation. The existing technique for static plagiarism detection is based on the contents, which are vulnerable to the change of code. Any attempt to detect plagiarism might be possibly failed if the codes are converted using semantic-based obfuscation methods. This paper proposes an effective tool for detecting the plagiarized location through the semantic-based analysis process by integrating the advantages of static and dynamic analysis techniques under the situation where binary code is available only. The structure of the tool suggested in the study consists of four components, plagiarism area explorer, memory changes tracer, abstract memory context constructor, and similarity comparator. The tool has been implemented and tested under x86- based LINUX environment. Experiments using several original and plagiarized-binary executable files show that our proposal can detect plagiarism effectively, compared with the existing tool.