유한요소법에 의한 음장해석에 관한 연구

최석주,귤수수,박병권,Choi Seok Joo,Tachibana Hideki,Park Byeong Jeon 한국음향학회 1989 韓國音響學會誌 Vol.8 No.5

유한요소법은 일반적으로 변분원리를 이용해 정식화를 하고 있으나, 본 연구에서는 웨이티드 잔차법으로 아주 좋은 근사해를 얻을 수 있다는 Galerkin법에 의해 Helmholtz방정식으로부터 직접 유산요소 정식화하는 방법을 소개하고, 정식화한 수치계산법을 2, 3차원 음장의 고유모드 및 음향방사상태해석에 응용하였다. 또한 수치 계산결과를 확인하기 위하여 간단한 모형을 제작, 실내음향 모드와 음압분포 등의 측정도 병행하였으며 그 결과, 유한요소법에 의한 수치해석결과의 측정치가 잘 맞는 것을 알았다. The finite element method is usually formulated by utilizing the variation principle. In this paper, we introduce the approximate equation of finite element from Helmholtz eqation by means of the Galerkin method, which provides the best approximation of those methods known as the method of weighted residuals, and a numerical simulation based of the finite element method is applied to analysing the acoustic modes and the pattern of sound radiation in two and three dimensional sound fields. Beside the numerical calculations, the acoustic modes and the sound pressure level are mesured by scale model experiments. The finite element analysis of the model shows very good agreement with the mesured results.

변형 협심증에서 운동부하검사 , Thallium - 201 심근관류검사 및 Holter 심전도 검사의 다양성

최석주(Seok Joo Choi),서홍석(Hong Seok Suh),오동주(Dong Joo Oh),박정의(Jeong Euy Park),노영무(Young Moo Ro) 대한내과학회 1989 대한내과학회지 Vol.36 No.3

N/A Variant angina is defined as angina occurring at rest with reversible ST-segment elevation of the ECG. However, the underlying coronary pathology of variant angina can be either a spasm of the coronary artery with fixed stenosis or a spasm of the normal coronary artery. Therefore, the clinical or laboratory features of variant angina may vary according to the underlying coronary pathology. In an attempt to investigate the features of the exercise stress test, Thallium-201 myocardial perfusion scintigraphy (MPS) and Holter ECG monitoring in 14 patients with variant angina were studied. The exercise stress test was positive in 57.1% of patients and negative in 42.9%. There was no relationship between the degree of ST-segment depression and the frequency and severity of attacks of chest pain at rest. Thallium-201 MPS showed reversible perfusion defects in 71.4%. The locations of the perfusion defects were anteroseptal (20%), anterolateral (20%), septal (10%), apical (10%), posterolateral (20%) and inferior walls (20%). Both the exercise stress test and Thallium-201 MPS were positive in 57.1% of patients, which favors the presence of exercise-induced myocardial ischemia due to fixed coronary artery disease. The exercise stress test and Thallium-201 MPS were both negative in 28.6%, and only the Thallium-201 MPS was positive in 14.3%. The Holter ECG during attacks of chest pain at rest showed ventricular tachycardia in 14.3%. The concordance rate of the Holter ECG lead of ST-segment elevation during the attacks of chest pain at rest with the location of the Thallium-201 MPS perfusion defect was 70%, and the discordance rate was 30%. In conclusion, the findings we observed in a limited patient series showed that there was diversity in the features of the exercise stress test and Thallium-201 MPS in patients with variant angina. These results seem to favor the coexistence of fixed coronary artery disease and spasm in a considerable proportion of patients with variant angina.

폐경 주변기 여성에서 호르몬 요법이 자궁 근종의 크기에 미치는 영향

최석주 ( Suk Joo Choi ),이유영 ( Yoo Young Lee ),김주한 ( Joo Han Kim ),최두석 ( Doo Seok Choi ),배덕수 ( Duk Soo Bae ),윤병구 ( Byung Koo Yoon ) 대한폐경학회 2004 대한폐경학회지 Vol.10 No.4

도시공원의 속성과 문제점

최석주(Seok Joo Choi) 한국지역지리학회 1996 한국지역지리학회지 Vol.2 No.2

본 연구에서는 대구시 도시공원의 소요량과 현황을 시기별, 지역별, 규모별로 고찰하여 도시공원의 속성을 구명하고자 한다. 그리고 도시공원 개발에 있어서의 문제점과 앞으로의 개선방안을 모색하고자 한다. 현재의 공원율은 大邱市 외곽의 큰 山이 있는 東區, 壽城區, 南區에서 높게 나타나고 있다. 이것은 대구의 근교 큰 산들이 自然公園, 都市自然公園으로 지정되어 있기 때문이다. 결국, 근교의 山이 없고 市界와 접하지 않은 中區, 西區에서는 면적이 작은 근린공원과 어린이공원으로 구성되어 있다. 그러나 대구시의 공원, 유원지가 지역적으로 편중되어 있으나 공원간의 연관 관계를 정립하면 녹지계통의 연결이 가능하다. 도심 공원의 조성에 있어서 大邱市에는 많은 移轉跡地가 민간부문에 의하여 토지의 소유권과 개발권이 전용되고 있다. 이전적지에 대해 당국에서는 도시 전체적 측면의 종합적 계획 및 검토, 이전적지에 대한 이용에 관해서 시민 의사를 적극적으로 반영하여 都市空間을 효율적으로 개발해야 할 것이다. 都市公園은 도시속의 綠地據點으로서 도시가 팽창하고 인구가 증가하여 都市環境이 과밀화 될수록 그 중요성은 더욱 증대될 것이다. 따라서 도시공원의 造成은 형태와 규모에 관계없이 都市生活의 質을 향상시킬 수 있는 방향으로 나아가야 할 것이다. 도시공원은 民主社會에 있어서 반드시 있어야 할 개방된 공간으로 고려되어야 한다. 현대도시의 開發과 管理에 있어서도 都市民을 위한 도시민에 의한 도시민의 공간이라는 철저한 인식하에서 이루어져야 한다. 공원과 公共공간은 누구나 이용할 수 있는 도시의 마당과 같은 것이며, 따라서 公園은 구미에서 도입된 계획이론과 이념의 차원보다도 우리의 公園답게 꾸며지고 이용되어야 한다. Today in the industrial society, the urban park is the place for citizens` health, recreation, exercise, and education. This is a very important place as a fine sight and maintenance of public security. As the results of rapid economic growth during the last thirty years, citizens are in the age of material civilization and are challenged with many serious urban problems such as pollution, noise, traffic congestion, human alienation, etc. Rapid material civilization brought to citizens` mental and physical diseases. To some of the problems, it is necessary that we should have proper leisure and recreation facilities, and that we should have the active, positive posture to them. Especially we need the out door recreational spaces and facilities. But nowadays the urban parks are given little thought in spites of the necessity of parks which should be used as a recreational spaces in the urban areas. So, This study attempt to comprehend the function, quantity and quality of the urban park system in Taegu. It is clear that the quantity is inappropriate. Because of inappropriate disposition and management, its coefficiency of utilization is low. In view of the population and park ratio, Dong Gu, Nam Gu, Suseong Gu and Dalseong Gun have comparative good, environments, However, Dalseo Gu, Seo Gu and Jung Gu have less geographical features. There are some methods to provide expansion of the aggregate of urban parks. We can use the school-grounds and their facilities, which were moved from C.B.D. to the outskirts of Daegu, or some parts of urban redevelopment, or the riverside of Sincheon river. In the urban park-program, users` satisfaction-factors are analyzed. We must reconsider the efficiency. The above problems are improved. Active administration and inhabitants` Positive participation are demanded so that the sound development of cities and daily life-surroundings are promoted.

有限要素法에 의한 消音器의 減音特性解析

최석주(Seok-Joo Choi) 한국소음진동공학회 1991 한국소음진동공학회 학술대회논문집 Vol.1991 No.6

결핵성 자궁관염과 연관되어 발생한 샘병태선

최석주 ( Seok Joo Choi ),원종현 ( Chong Hyun Won ),장성은 ( Sung Eun Chang ),이미우 ( Mi Woo Lee ),최지호 ( Jee Ho Choi ),문기찬 ( Kee Chan Moon ) 대한피부과학회 2012 대한피부과학회지 Vol.50 No.4

Lichen scrofulosorum is a rare disease of children and young adults. The cutaneous lesions of LS are typically symptomless, tiny, flat-topped papular eruptions, which are skin-colored and follicular in distribution. Histopathologically, LS shows perifollicular noncaseating granulomas. LS is usually associated with extrapulmonary tuberculosis, especially of the lymph nodes and bones, and has also been reported in patients with pulmonary tuberculosis. However, the underlying focus is not always obvious, at the time of rash development, and could be diagnosed after the development of LS. Here, we describe a 43-year-old Korean woman with LS who developed tuberculous salpingitis 8 months later. (Korean J Dermatol 2012;50(4):358∼361)

안면부에 발생한 피부섬유종 13예에 대한 임상조직학적 고찰

최석주 ( Seok Joo Choi ),김정은 ( Jeong Eun Kim ),원종현 ( Chong Hyun Won ),장성은 ( Sung Eun Chang ),이미우 ( Mi Woo Lee ),최지호 ( Jee Ho Choi ),문기찬 ( Kee Chan Moon ) 대한피부과학회 2012 大韓皮膚科學會誌 Vol.50 No.8

Background: Dermatofibroma (DF) is one of the most common benign soft tissue tumors, and its diagnosis is not difficult if clinicopathologic features are typical. However, DF occurring on the face is very rare; therefore, it is usually missed clinically. Objective: This study was conducted to obtain better understanding of the clinicopathologic features of dermatofibroma of the face. Methods: This is a retrospective study of fibrous histiocytoma of the face at our center over a 23-year period (1989∼2011). Clinicopathologic features of 13 patients were evaluated. Results: Of the 13 patients, ten were female and three were male. The neoplasms presented with various and atypical features, such as nodule, ulceration and papules. Low-power examination revealed that most of the cases were extended beyond the subcutaneous fat layer, showing ill-defined diffuse infiltrative pattern. The most common histologic type was typical fibrocollagenous type, but some cases presented features of cellular or angiomatous type. Mitotic activity was not definite in majority of cases, and usually ranged 0∼1 mitoses per 10 HPF and a few atypical cells were shown in 2 cases, but not accompanied by recurrence. Tumor cells in all cases tested were negative for desmin and CD34, but positive for Factor XIIIa and CD68 in majority of the cases. Conclusion: Because of its rare development on face and diverse clinical presentation, correct diagnosis with differential diagnosis is thought to be important. DF of the face usually presents with infiltration of deeper structures and still shows a benign behavior.

대구시의 사회지역연구

최석주(Seok Joo Choi) 한국지역지리학회 1997 한국지역지리학회지 Vol.3 No.2

본 연구는 대구시에 거주하며 경제적·사회적으로 안정된 지위에 있는 저명인사를 대상으로 사회지역 분석을 시도하였다. 이는 도시내의 불량주거 또는 저소득층의 주거에 관한 기존의 고찰과 더불어 의의가 있을 것이다. 대구에 거주하는 저명인사는 도심의 전통적인 주거지역인 1日城郭의 내외에 인접한 중구와 더불어, 토지구획정리사업이 진행된 지역중 수성구와 남구에 밀집되어 있다. 또한 쾌적한 주거환경을 위해 지정된 주거전용지역은 부유계층의 주거집단을 형성하면서 수성동, 만촌동, 대명동의 일부지역이 대구의 신흥 고급 주택지가 형성되는 계기가 된다. 오늘날 저명인사의 분포특성은 수성구에 가장 많이 거주하고, 남구, 중구의 순이다. 또 저명인사의 동별 절대수와 인구 1만명당 동별 분포 밀도가 상위 6위까지 모두 같은 동(범어4, 수성1가, 봉덕2, 대봉1, 봉덕3, 만촌2)들이 포함되어 있어 이들의 두 가지 순위는 대동소이한 것으로 나타났다. 이러한 결과는 저명인사들이 특정지역에 밀집하여 거주하고 있다는 것을 나타내고 있다. 지난 10년간 변화특성은 저명인사의 기존밀집지역인 중구와 남구는 감소하고, 수성구에 현저한 증가를 보인다. 이것은 지난 10년간 이 지역에 꾸준히 추진된 택지개발과 학교 등 공공용지의 이전에 따른 고급아파트 지역의 형성의 영향도 크며, 교통, 생활 편익 시설의 상태 외에 주거입지결정 인자로서 주요한 위치를 차지하는 소위 교육여건이 유리한 학군이 저명인사의 분포에도 상당한 영향을 미친 것으로 판단된다. 이들 지역중에도 시간이 경과함에 따라 기존건축물의 노후화와 시가지의 외곽확대, 전원주택의 선호 경향 등 제반 여건의 변화에 따라 저명인사의 밀집현상은 다소 완화 될 것이 전망된다. Today, rapid progress of urbanization is discovered commonly in many countries, especially in developing countries, which has led to spatial order and development process of city. Historically, Taegu was a walled city and formed mono-nucleus which was restricted by the castle. As the city grew gradually, the castle was removed as a result of diversification in traffic network, change of socio-economic environment, formation of industrial base and functional distribution. According to reconstruction maps of residential patterns. there was distinctive residential segregation among ethnic groups. Koreans in Taegu in 1939, aggregated densely in the southern and western parts of the city. The Japanese were concentrated densely in the northern and eastern parts of Taegu. And the street pattern within residential areas of the Korean people was shaped like a maze type in contrast with Japanese residential areas, which showed grid pattern of streets. This is another general pattern of almost all colonial cities, especially in Asia. Through this process, today it appears that, out of overall residential areas which occupy the highest ratio in urban land use, those for eminent people influence the functional development of urban spatial structure very heavily as a key point in urban residential structure. Truly, residential segregation can be seen as the spatial manifestation of uneven distribution of such important scarce resources as housing and residential environment. In this study, the characteristics of locational distribution of the eminent people show their socially and economically stabilized standing in Taegu, taking the aforesaid situation as a background of the study. And the process of this study is as follows ; to examine the forming process of residential areas in the city as a theoretical supporting, to put in order on classical interpretation to formation of residential areas, and general type modern residential areas formation, and economic decision factor of land use. Therefore, this study aims to examine growth and development of eminent persons` residential areas and, at the same time, extract locational characteristics through the pattern of eminent persons` location and predict changes in the future.

공동주택단지의 교통소음 저감을 위한 축척 음향모형 실험

주진수(Joo Jin-Soo),최석주(Choi Seok-Joo) 한국소음진동공학회 2000 한국소음진동공학회 학술대회논문집 Vol.2000 No.1

공동주택의 엘리베이터 소음저감대책

김석홍(Seok-Hong Kim),최석주(Seok-Joo Choi),김종훈(Jong-Hoon Kim) 한국소음진동공학회 1995 한국소음진동공학회 학술대회논문집 Vol.1995 No.11