[논문]스트렷-타이 모델에 의한 사각형 단면 코벨의 설계 기법

김대성,김태완,이승훈,엄장섭,진치섭 釜山大學校生産技術硏究所 2004 生産技術硏究所論文集 Vol.63 No.-

콘크리트 코벨은 D-영역을 갖는 대표적인 구조물로서 복잡하고 다양한 형상의 파괴메커니즘을 보인다. 이는 응력집중과 기하학적인 불연속으로 일반적인 보 이론의 적용이 불가능하여 해석 및 설계에 어려움이 많다. 본 연구에서는 지압파괴,압축파괴 및 전단파괴를 유발하는 복잡한 파괴메커니즘을 형성하고 있는 사각형 단면 코벨의 거동 및 파괴형상을 예측하고 스트릿-타이 모텔을 적용하여 해석 및 설계를 하였다. 또한 현행의 설계방법과의 비교를 통하여 스트렷-타이 모델이 보다 합리적이고 경제적인 설계방법임을 보였다.

특화된 정보DB구축을 통한 영주지역 허브 사이트 설계에 관한 연구

장성대,김기태 慶北專門大學 2003 慶北專門大學 論文集 Vol.22 No.-

In recently years, internet is rapidly development. But Yeongju is not enough good quality information provider. So, we want to provide quality information to Yeongju's and provide recently information to customer. In this paper, we designed database structure to designed Yeongju Hub sites.

상어 간유 흡인에 의한 급성 지방성 폐렴 1예 : 증례보고

임성경,옥철호,김희규,장태원,정만홍 고신대학교의과대학 2008 고신대학교 의과대학 학술지 Vol.23 No.4

저자들은 상어 간유를 과량 복용하고 기침, 호흡곤란을 주소로 내원한 48세 여자 환자에서 방사선 소견과 기관지 폐포 세척액 검사를 통해 급성 지방성 폐렴으로 진단하고 스테로이드에 불응하는 경과를 취하자 우측 전폐 기관지 폐포 세척술을 시행하여 폐 병변과 증상의 호전을 보인 1례를 경험하였기에 문헌고찰과 함께 보고하는 바이다. Acute lipoid pneumonia is uncommon condition of the lungs that results from the aspiration of vegetable, animal, or mineral oils. Shark liver oil (so called Squalene) is taken as a traditional remedy in some Asian countries, and is used widely also in cosmetics. It results in foreign body type inflammatory reaction of the lung and can show various clinical presentations from asymptomatic incidental finding to severe pneumonia leading to acute respiratory failure. Although many cases have been reported, severe lipoid pneumonia requiring steroid or whole lung lavage for treatment is rare. We experienced a case of acute lipoid pneumonia of 48 year old female with dyspnea and cough caused by regular ingestion of large amount Shark liver oil, treated by whole lung lavage. We reported this case with a brief review of related literatures.

싱글 튜브 시스템 BTA 工具를 使用한 SM55C 鋼의 深孔 加工 特性에 관한 硏究

全泰玉,全彦燦,沈成輔,張性圭 동아대학교 공과대학 부설 한국자원개발연구소 1994 硏究報告 Vol.18 No.2

The BTA deep hole machining has an increasing demand because of its wide applications and its good productivity. The main feature of the BTA drill is that the tool cutting edges are unsymmetrically located on the boring head. This provides a stabilizing cutting force resultant necessary for self guidance of the boring head. The BTA drills are capable of machining for having large length to diameter ratio in single pass. The study of the accuracy and surface finish of holes produced would reveal quite useful information regarding the process. This thesis deals with the experimental results obtained during single tube system BTA machining on SM55C steel for different machining conditions.

Sinc 기저함수를 이용한 CGFFT의 수렴률 개선

이기태,장재성,김장형 濟州大學校工科大學附屬産業技術硏究所 1992 尖端技術硏究所論文集 Vol.3 No.-

The current induced on a perfectly conducting strip excited by incident fields which are transverse magnetic (TM) wave or transverse electric (TE) wave to the strip axis are solved by three methods. The one is analytic and the others are numerical methodd; SIT (Spectral Iteration Technique), CGFFT (Conjugate Gradient Fast Fourier Transform). It is estimated accuracy of current values, as that are compared results of the analytic method with that of the numerical methods. The procedure involves the incorporation of subdmain basis functions associated with the current representation of a conducting strip. It is shown that significant improvements are achieved in the convergences of the CGFFT method when using sinc basis functions.

2.5-헥산디온에 노출된 근로자에게서 발생한 말초 신경병증

조성용,장용석,최은경,김진석,유재영,우극현,최태성 대한산업의학회 2007 대한직업환경의학회지 Vol.19 No.1

목적: 영상음향장비 제조업체에서 2,5-헥산디온을 취급한 근로자에게서 발생한 다발성 말초 신경병증 환례를 보고하고, 동일 공정근로자들의 말초 신경기능을 조사하고 자 한다. 방법: 환례에 대해 방사선학적 검사, 소변 및 혈액 검사, 신경전달속도 검사, 작업환경 측정을 하였으며, 2,5-헥산디온의 노출을 중단시킨 후 5개월 후에 다시 신경전달속도 검사를 하였다. 동일공정 근로자들의 영향평가에서는 2,5-헥산디온에 노출된 13명의 남자 근로자를 노출 군으로, 해당 물질에 노출된 적이 없는 5명의 남자 근로자를 비노출군으로 선정하여 검사를 하였다. 결과: 환례의 신경전도 검사결과 양측 척골신경과 정중 신경에 이상소견을 보였으며, 호전여부를 관찰하기 위하여 5개월 후 추적검사를 실시한 결과 증상 및 신경전달속도 검사결과가 호전되었다. 동일공정 근로자들의 영향평가에서 노출군의 정중 신경과 척골신경이 비노출군에 비하여 유의하게 감소되어 있었다. 감각 신경의 진폭의 경우, 노출군의 정중 신경과 비복 신경이 감소되었으며, 운동 신경 전도속도에서는 노출군의 비골신경이 유의하게 감소되어 있었다. 말단 잠복기에서는 노출군의 정중신경, 척골신경, 비골신경, 경골신경이 비노출군에 비해서 유의하게 연장되어 있었다. 결론: 환례의 증상과 신경전달속도 검사의 이상소견은 2,5-헥산디온에 의한 말초신경병증에 부합되었다. 동일공정 근로자 건강영향평가에서 신경전달속도 검사결과 노출 군과 비노출군간의 유의한 차이가 있었는데, 이를 통해 2,5-헥산디온이 근로자들의 신경독성에 영향을 줄 수 있다는 것을 확인할 수가 있었다. Objectives: This study is a case report of 2,5-hexanedione induced occupational peripheral polyneuropathy. We also investigated the peripheral nerve function of all workers who had been exposed to 2,5-hexanedione in the same process. Methods: In June, 2006, a 2,5-hexanedione exposed worker complained of both hand numbness. He received neurologic, radiologic, laboratorial and electrophysiologic evaluation, including measurements of workplace environment. Five months after cessation of exposure to 2,5-hexanedione, a follow-up electrophysiologic examination was done. We evaluated the peripheral nerve function of 2,5-hexanedione exposed workers by comparing 13 male 2,5-hexanedione exposed workers who were in same company with the patient and 5 male workers who had not been exposed to 2,5-hexanedione. Results: Under electrophysiologic examination, there were abnormalities in sensory and motor nerve velocity, terminal latency, and F-latency of both median nerve and ulnar nerve. After 5 months, the patient symptoms and the results of follow-up electrophysiologic examinations were improved. Comparing the 2,5-hexanedione exposed group with the unexposed group, the sensory nerve velocity of the median and ulnar nerves in the exposed group was decreased. The motor nerve velocity of the peroneal nerve, and sensory nerve velocity of the median and sural nerves were decreased. Terminal latency of median, ulnar, peroneal, and tibial nerves in the exposed group were increased compared with the unexposed group(<0.05). Conclusions: 2.5-hexandione can induce peripheral polyneuropathy in male workers.

마이크로 엔드밀을 이용한 측면가공에서의 공구변형에 의한 가공오차 보상

전두성,서태일,윤길상,장호수 한국공작기계학회 2007 한국공작기계학회 추계학술대회논문집 Vol.2007 No.-

This paper presents an integrated machining error compensation without measuring cutting force in micro end-mill. To compensate machining error, we consider new tool path. In order to determine the compensated tool path, two machining error parameters are defined and modeled using the SEM images. Experiments are carried out to validate the approaches proposed in this paper. In result, we identify the proposed methods are effective to compensate for machining errors.

계층화분석법을 이용한 노후 공동주택의 재건축과 리모델링 의사결정방법

이태영,장한두,제해성 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(계획계)

In this study, it is tried to establish a integrated evaluation method composed of functional criteria, economical criteria and characteristic criteria of apartment housing, the latter is additional consideration. Functional and economical criteria is similarly effected in decision making to respectively apartment housings with different characteristics by functional evaluation and profit analysis. There is necessity for recognizing that decision making between reconstruction and remodeling of apartment housing must be performed as not single development project but consideration of residential environment to improve the quality of residents' environment in long-range insight. Therefore, meaning of this study is to find out the possibility of application about characteristics of apartment housing as criteria than to make a practical evaluation method.

Sinc 기저함수를 이용한 CGFFT의 수렴률 개선

이기태,김장형,장재성 濟州大學校 工科大學 産業技術硏究所 1992 産業技術硏究報告 Vol.3 No.-

The current induced on a perfectly conducting strip excited by incident fields which are transverse magnetic (TM) wave or transverse electric (TE) wave to the strip axis are solved by three methods. The one is analytic and the others are numerical method: SIT (Spectral Iteration Technique), CGFFT (Conjugate Gradient Fast Fourier Transform). It is estimated accuracy of current values, as that are compared results of the analytic method with that of the numerical methods. The procedure involves the incorporation of subdmain basis functions associated with the current representation of a conducting strip. It is shown that significant improvements are achieved in the convergences of the CGFFT method when using sinc basis functions.

주택가격 분석을 통한 친환경인증단지 실효성 연구 : 수도권 공동주택을 중심으로 Focused on The Multi-Family Housing in The Capital Region

김연준,성장환,안태선 대한건축학회 2004 대한건축학회논문집 Vol.20 No.12

The propose of this study is to evaluate the environment-friendly housing estates by the housing price analysis in the capital region of Korea For this purpose this study compares the certified and the non-certified housing estates in terms of the housing price differences between them. 20 certified and 40 non-certified estates were selected to analyze housing price difference according to the factors which affect the housing price In order to find out the evaluation factor differences T-test and Chai square were conducted and Cluster analysis was also done for the different housing estates It finds that no housing price differences between the certified and non-certified estates exist clearly It means the Environment-friendly certification system does not work effectively in the housing development in Korea From the price difference analysis this study suggests the environment elements to be provided In the new housing development It also discusses the reasons why the certification system does not operate in the housing development Finally, this study concludes with the some recommendations for the future Environment-friendly housing development