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최재성,이진욱,이상득,조권회,Choi, Jae-Sung,Lee, Jin-Uk,Lee, Sang-Dug,Cho, Kwon-Hae 한국마린엔지니어링학회 2007 한국마린엔지니어링학회지 Vol.31 No.2
The variation of the crankshaft speed in a multi-cylinder engine is determined by the resultant gas pressure torque and the torsional deformation of the crankshaft. Under steady state operation, the crankshaft speed has a quasi-periodic variation. For the diagnosis the engine instantaneous speed versus crankshaft angle is utilized. This paper describes a simple measurement method of the engine instantaneous speed versus crankshaft angle using the teeth on the flywheel of the crankshaft. Two non-contacting magnetic pickup combinations detect the crank angle and TDC position for the data acquisition. The results from experiments on a 6 cylinder marine diesel engine demonstrate that the crankshaft speed variation are detected with good resolution. And the crankshaft speed variation is investigated according to the operation conditions. Also, it is confirmed that the engine output measured by EMS can be evaluated larger than the actual value due to TDC position error caused by instantaneous speed variation.
최재성(Choi, Jae-Sung),정세정(Cheong, Sejeong),조자영(Cho, Jayoung) 한국사회복지학회 2016 한국사회복지학 Vol.68 No.1
본 연구의 목적은 한국사회복지행정학 연구가 어떠한 경향적 특성을 보여왔는가를 규명하는 것이다. 연구방법으로는 관련 연구논문들에 대한 연구경향성분석을 사용하였다. 특히 대표적인 연구경향성분석 방법으로 알려진 내용분석과 네트워크분석을 사용하였다. 각각의 분석방법이 가지고 있는 강점을 모두 취하고 반대로 약점은 상호보완할 수 있다고 판단하였다. 분석사례는 한국사회복지행정학 학술지에 게 재된 최근 10년간의 논문 221편을 대상으로 하였다. 분석 결과는 다음과 같다. 첫째, 네트워크분석 및 내용분석 결과 사회복지행정학 연구는 크게 ‘사회(복지)서비스’와 ‘사회복지조직’의 클러스터로 구분 되며, 그 가운데에서도 인적자원과 관련된 연구에 편중되는 것으로 나타났다. 둘째, 실천현장 중심의 새로운 주제들도 등장하나, 전통적인 주제들과는 독립적으로 연구가 수행되는 경향이 있었다. 셋째, 조직구성원을 대상으로 한 양적연구의 비중은 압도적으로 높게 나타났으나, 질적연구, 근거 기반 개입 연구, 혼합연구방법, 담론적 논의 등은 상대적으로 부족한 것으로 밝혀졌다. 또한, 사회복지의 사각지 대인 농어촌지역을 대상으로 한 연구나 정보관리, 재무관리, 마케팅, 조직혁신 등의 전통적 복지행정 영역의 주제들도 중요성에 대한 논의에 비해 희소한 것으로 드러났다. The purpose of this study is to examine the trend of the studies on Korean social welfare administration over a recent 10 year period. Employing both network analysis and content analysis, which are representative statistical strategies to identify research trends, we analyzed 221 articles published in the Journal of Korean Social Welfare Administration from 2005 to 2014. The major findings were as follows; First, we found two clusters –“social (welfare) service” and “social welfare organization”– in the studies of social welfare administration. In addition, more than 80% of articles are mainly related with human resource management, including job satisfaction, organizational commitment, and so forth. Second, the newly emerging academic subjects such as social enterprise and community network appeared to be done independently of traditional subjects. Third, the proportion of quantitative studies being focused on human resources was overwhelmingly high compared to the other types of studies; therefore, there are a few studies using qualitative or mixed method, evidence based practice, and discourse studies. In addition, the studies of the rural areas, which are a blind spot of the social service delivery system, and the studies about information management, financial management, marketing, organization innovation rarely appeared, despite their significance.
진동 측정에 의한 석조문화재 복원 공사 전·후의 동특성 추정
최재성 ( Jae-sung Choi ),조철희 ( Cheol-hee Cho ) 한국구조물진단유지관리공학회 2021 한국구조물진단유지관리공학회 논문집 Vol.25 No.1
보물 제49호 나주 석당간은 성능 저하로 인해 해체 및 복원 공사가 이루어 졌다. 공사시 균열 부위가 보강되고 기울어짐이 개선되었다. 이러한 문화재들의 복원 공사 전 · 후의 강성 변화를 정량적으로 분석하고 데이터베이스로 구축하여 보강 효과에 대한 예측 또는 평가를 할 수 있는 과학적인 비파괴 검사 방법에 대한 연구가 필요하다. 복원 공사 전·후에 진동실험에 의해 측정된 고유진동수와 탄성계수 정보로부터 구조 시스템의 전체적인 강성을 추정할 수 있는 단순 식을 유도하였고, 활용성을 검토하였다. 제시된 방법으로 중요 문화재의 강성을 정기적으로 조사한다면 구조안전진단 필요 시점 또는 보수, 보강의 필요 시점을 추정하는 자료로 활용될 수 있을 것을 판단된다. Naju Seokdanggan, Treasure No. 49, was dismantled and reconstructed due to poor performance. During construction, the crack area was reinforced and the inclination was improved. It is necessary to analyze the stiffness changes before and after the reconstruction of these cultural properties, and to establish a database of related information. In addition, there is a need for research on a scientific non-destructive testing method capable of predicting or evaluating the reinforcing effect. In this study, a simple equation for estimating the overall stiffness of the structural system was derived from information on the elasticity coefficient and the natural frequency measured by vibration tests before and after reconstruction work, and the applicability of the equation was examined. If the stiffness of important cultural properties is regularly investigated by the suggested method, it is judged that it can be used as data to estimate the time when structural safety diagnosis is necessary or when repair or reinforcement is necessary.
일차성 Sjogren씨 증후군에서 발생한 림프구성 간질성 폐렴 증례보고와 국내문헌고찰
모상일 ( Sang Il Mo ),이혁규 ( Hyeok Gyu Lee ),조아라 ( A Ra Cho ),정혜경 ( Hye Kyoung Chung ),이호성 ( Ho Sung Lee ),최재성 ( Jae Sung Choi ),서기현 ( Ki Hyun Seo ),나성수 ( Seong Su Nah ),김용훈 ( Yong Hoon Kim ),나주옥 ( Ju Ock 대한결핵 및 호흡기학회 2010 Tuberculosis and Respiratory Diseases Vol.69 No.5
Lymphoid interstitial pneumonia (LIP) is a rare benign lymphoproliferative interstitial lung disease. LIP has been associated with autoimmune disorders, HIV, viral infections, and so on. Once underlying systemic diseases have been excluded, a diagnosis of idiopathic LIP can be made. Although 6 cases of pathologically confirmed LIP have occurred in Korea, thus far none has been associated with primary Sjogren`s syndrome. A 44-year-old man was admitted to hospital due to a dry cough and dypsnea on exertion that had been ongoing for 2 months. A chest radiography showed multiple and variable-sized cystic lesions, on both lungs and both interstitial infiltration and consolidation in both lower lung fields. Tests for autoantibody showed positive results of anti-nuclear antibody and anti-Ro/La antibody. The patient underwent a video assisted thoracoscopic surgery biopsy and pathologically confirmed LIP. We report the first known case of LIP-associated with primary Sjogren`s syndrome in Korea.