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증례 : 류마티스 ; 류마티스관절염 환자에서 발생한 비정형 대퇴골 골절의 1예
김담 ( Dam Kim ),정소담 ( So Dam Jung ),손창남 ( Chang Nam Son ),최지영 ( Ji Young Choi ),이승훈 ( Seung Hun Lee ),김이석 ( Yee Suk Kim ),성윤경 ( Yoon Kyoung Sung ) 대한내과학회 2014 대한내과학회지 Vol.87 No.2
류마티스관절염 환자에서 질환 자체의 활성도나 질환으로 인한 비스포스포네이트의 장기간 사용 및 PPI, 스테로이드의 사용으로 비정형 대퇴골 골절의 위험도가 높아질 수있으므로 비정형 대퇴골 골절에 대한 많은 연구가 필요하다고 생각하며 대퇴부 통증이 있는 경우 비정형 대퇴골 골절을 염두에 두고 면밀한 진찰과 영상진단을 해야 한다. Atypical femoral fractures are characterized by a subtrochanteric or diaphyseal location. Recent studies have suggested that long-term treatment with bisphosphonates might be associated with the occurrence of atypical femoral fractures. The present report describes a case involving a 60-year-old woman with left buttock pain that was unassociated with trauma. Her hip pain was initially considered to be a symptom of her underlying rheumatoid arthritis, but a plain radiography, bone scintigraphy, and magnetic resonance imaging revealed an insufficiency fracture in the lateral shaft of the left proximal femur. She had been treated with a bisphosphonate for 4.5 years because of a previous vertebral fracture. Her chronic, long-term rheumatoid arthritis and history of bisphosphonate administration were considered to be associated with the development of her atypical femoral fracture. (Korean J Med 2014;87:240-244)
풍력발전과 전기자동차가 전력계통의 신뢰도에 미치는 영향 평가
김담(Dam Kim),박현곤(Hyeongon Park),권헌규(Hungyu Kwon),박종근(Jong-Keun Park) 대한전기학회 2015 전기학회논문지 Vol.64 No.11
An increasing number of electric vehicles (EVs) in power system affects its reliability in various aspects. Especially under high EV penetration level, new generating units are required to satisfy system’s adequacy criterion. Wind power generation is expected to take the major portion of the new units due to environmental and economic issues. In this paper, the system reliability is analyzed using Loss of Load Expectation (LOLE) and Expected Energy Not Served (EENS) under each and both cases of increasing wind power generation and EVs. A probabilistic multi-state modeling method of wind turbine generator under various power output for adequate reliability evaluation is presented as well. EVs are modeled as loads under charging algorithm with Time-Of-Use (TOU) rates in order to incorporate EVs into hour-to-hour yearly load curve. With the expected load curve, the impact of EVs on the system adequacy is analyzed. Simulations show the reliability evaluation of increasing wind power capacity and number of EVs. With this method, system operator becomes capable of measuring appropriate wind power capacity to meet system reliability standard.
온라인 뉴스 사이트에서의 일반댓글과 소셜댓글의 비교분석
김소담(So-Dam Kim),양성병(Sung-Byung Yang) 한국콘텐츠학회 2015 한국콘텐츠학회논문지 Vol.15 No.4
온라인 뉴스에서 개인의 참여가 활성화 되면서 댓글의 중요성이 부각되고 있다. 최근엔 개인의 SNS(social networking site) 계정을 이용하여 댓글을 게재할 수 있는 소셜댓글 서비스가 활성화 되고 있다. 본 연구에서는 실제 온라인 뉴스 댓글 현황 데이터를 이용하여 (1) 댓글의 일반적 특성요소 중 일반댓글과 소셜댓글이 차이점을 보일 가능성이 있는 요소를 도출한 후, (2) 일반댓글에 비해 소셜댓글이 각 특성요소 별로 어떻게 다른지 비교 분석하고, 마지막으로 (3) 소셜댓글 이용 업체별로 각 특성요소가 어떻게 달라지는지를 실증 분석해보았다. 이를 위해 기존문헌 조사 및 전문가 인터뷰를 진행하여 여섯 가지 특성요소를 도출하였다. 다음으로 SPSS Statistics의 t-test의 분석 방법을 사용하여, 소셜댓글과 일반댓글이 모든 요소에서 유의한 차이를 보임을 확인하였고, ANOVA와 Duncan test 결과 트위터와 페이스북 그룹 간 차이가 유의함을 확인하였다. 본 연구를 통해 소셜댓글의 실제적인 가치를 명확히 파악할 수 있을 뿐만 아니라, 소셜댓글을 이용한 악성댓글 문제 해결에 실마리를 제공하고, 개인, 기업, 정부기관 등을 주체로 다른 분야의 적용가능성도 살펴볼 수 있을 것으로 기대한다. As the individual participation in online news sites proliferates, the importance of online news comments has been increasing. Social comment services which help people leave comments on news articles using their own SNS (social networking site) accounts have gained popularity recently. Using data gathered from an online news site, this study, therefore, (1) identifies factors differentiating social comments from general comments, (2) examines how social comments are significantly different from general comments in terms of each factor, (3) and further validates how the social comments’ characteristics vary among different type of SNS. Then, we investigated this study by applying t-test, ANOVA, and Duncan test of SPSS Statistics. Our results provide insights on the significant differences in all the factors between general and social comments. We also found that there is a significant difference between Facebook and Twitter groups among three types of SNS. The findings of this study would help assess the actual benefit of social comment services as they may provide us with several valuable leads to solve the malicious comments issue. Moreover, they would suggest the need to apply this service to other areas, such as online environments in private and public sectors.
김담 ( Dam Kim ),성윤경 ( Yoon-kyoung Sung ) 대한내과학회 2016 대한내과학회지 Vol.91 No.3
Nonsteroidal anti-inflammatory drugs (NSAIDs) are commonly used to treat pain and inflammation. There are two kinds of NSAID classified according to the selectivity of COX-2 inhibition: non-selective NSAIDs and cyclooxygenase (COX)-2 inhibitors. Non-selective NSAIDs have a high incidence of gastrointestinal and bleeding-associated adverse events, while COX-2 inhibitors are safer in terms of these events. However, COX-2 inhibitors are thought to cause increased cardiovascular events. The COX-2 inhibitors rofecoxib and valdecoxib were withdrawn from the market over safety concerns. Three COX-2 inhibitors are now available in South Korea after the recent approval of etoricoxib and polmacoxib for osteoarthritis patients. After reviewing the history of and recent studies about the safety of COX-2 inhibitors, physicians should find new uses for old drugs. (Korean J Med 2016;91:250-256)