상악에 발생한 백악질골화성섬유종에 대한 증례보고

이창연,김주원,장창수,임진혁,양병은,김좌영,배현경,Lee, Chang-Youn,Kim, Ju-Won,Jang, Chang-Su,Yim, Jin-Hyuk,Yang, Byoung-Eun,Kim, Jwa-Young,Pai, Hyun-Kyung 대한악안면성형재건외과학회 2012 Maxillofacial Plastic Reconstructive Surgery Vol.34 No.3

Cemento-ossifying fibroma (COF) is a benign fibro-osseous tumor with fibrous tissue, abnormal cement and bone, or a combination of such elements. These are slow-growing lesions and are more frequent in women. Here, we report the case of a 28-year-old Korean woman. The patient having no underlying disease complained about facial swelling and asymmetry. A firm mass with impacted molars and teeth deviation on the right maxilla was observed. A computed tomography scan was taken and an incisional biopsy was performed. Following this, COF was diagnosed. Complete surgical removal of the lesion was carried out. A post-operative follow-up was conducted and 3 months later the patient reported no discomfort or any sign of recurrence in regards to the lesion. Differential diagnosis with fibrous dysplasia and the COF is important because of the treatment choice. We report a case of COF and offer a review of the literature on this article.

도시 대표경관의 인지요인에 관한 탐색적 연구 - 서울시를 중심으로 -

이창연,김한배,Lee, Chang-Yeon,Kim, Han-Bai 한국조경학회 2010 韓國造景學會誌 Vol.37 No.6

도시이미지 안에서 대표경관들은 그 도시를 상징하며 사람들에게 그 도시의 도시다움을 느끼게 해주는 도시정체성의 중요한 기간자원 역할을 하고 있다. 본 연구는 도시의 대표경관들이 어떠한 지각-인지의 조건들로 인해 대표성을 획득하게 되는지를 밝혀 보고자 하였다. 먼저 서울시를 중심으로 도시 대표경관과 관련된 기존 연구들을 종합하여 대표경관들을 도출하고, 그들 각각의 인지요인들을 설문을 통해 조사하여 유형별 요인별로 다각적 비교분석을 하였고, 그 결과를 향후 대표경관 계획 및 관리방안의 시사점으로 제시하였다. 연구의 기본방향은 특히 가시적 요인, 심미적 요인, 활동적 요인, 문화적 요인을 중심으로 진행되었다. 주목할 만한 사실은 다면적 요인의 분석에 의한 본 연구의 결과는 기존 연구에서의 대표경관의 인지 순위와는 큰 차이를 나타내고 있다는 것이고, 이에는 시민들의 문화적 요인에 대한 인식의 비중이 높아진 것이 원인으로 해석된다. 이러한 연구결과는 아직 기초적 연구결과이기는 하지만 후속 연구의 보완을 통해 향후 대표경관 계획과 관리의 새로운 관점을 제시할 수 있으리라 기대된다. The urban representative landscapes play a leading role in establishing city identity via a symbol of the city and a mediator to make the city all the more worthy of being peculiarized. The study aims at evaluating the perceptive factors in the representative landscapes around the metropolitan Seoul derived from the preliminary researches through questionnaire surveying, in an attempt to analyze their characteristics by type and reason, while further proposing progressive management plans. This study was mostly focused on the visibility factor, activity factor, aesthetic factor and cultural factor influencing on the cognition of urban representative landscapes. The important findings discovered in this research are as follows. First, it was found that people were being interested more on the cultural factors and the activity factors these days rather than visibility factors in the cognition of urban representative landscapes. Second, it was found that the priority rank of urban representative landscapes revealed in this study based on the total account of more diverse perceptive factors, showed so much alteration compared to the previous researches focused mostly upon the visual image.

페경기 여성에서 호르몬 대체요법의 지질대사 및 골밀도에 대한 효과: 지속적 요법과 순차적 요법의 비교

이창연,이숙향,Lee, Chang Yun,Lee, Sukhyang 한국임상약학회 2000 한국임상약학회지 Vol.10 No.3

Menopausal women experience urogenitory and vasomotor symptoms with increased risk of osteoporosis and cardiovascular diseases, which can be reduced by hormone replacement therapy. However unopposed estrogen therapy has been associated with an increased risk of endometrial hypeiplasia or cancer. The objectives of this study were to compare effects of continuous vs. sequential hormone replacement therapy (HRT) on lipid profile, bone mineral density and menopausal symptoms of postmenopausal women and to assess how they perceive the menopause and HRT culturally. In this retrospective study, women in menopause longer than 6 months, normal in the mam-mogram and Papanicolaou smear, cholesterol level lower than 190 mg/dL or triglyceride level lower 4han 500 mg/dL were treated with Srogen (conjugated equine estrogen 0.625 mg tablet) and Provera (medroxyprogesterone acetate 2.5 mg tablet) for continuous treatment(CT) or Cycloprogynova (Estradiol valerate 2 mg and Norgestrel 0.5 mg complex tablet) for sequential treatment(ST). They were evaluated for lipid profile, bone mineral density, menopausal symptoms, side effects and their perception of menopause and HRT. As results, total sixty-seven patients out of ninety-four enrollees were included in final analysis (33 in continuous therapy, 34 in sequential therapy). There were significant decrease in total cholesterol ($15.04\pm3.17$, p=0.0001), LDL ($19.72\pm3.27$, p=0.0001), and increase in HDL ($5.89\pm1.63$, p=0.0001). Bone minora) density increased significantly with HRT ($0.02\pm0.11$, p=0.0001). But, there were no significant differences in change of lipid profile between continuous and sequential therapy: Total cholesterol, $13.12\pm4.7\;vs.\;16.91\pm4.3;\;LDL\;20.53\pm4.1\;vs.\;18.93\pm5.12:HDL\;7.15\pm2.3\;vs.\;4.67\pm2.2,\;p>0.05$. Incidences of flush reduced from $75\%\;(CT)\;to\;3.13\%\;and\;71.88\%\;(ST)\;to\;9.35\%$. The change of endometrium and breast were found 3 (CT) and 5 (ST) women, respectively. Most of women recognized that HRT is necessary $(70\%)$ for postmenopausal period but did not understand well the cardiovascular protective effect. In conclusion, hormone replacement therapy was effective in improving lipid profile, bone mineral density and menopausal symptoms in both continuous and sequential treatments with similar efficacy.

스테로이드 저항성 신증후군 환아에서의 Methylprednisolone 충격 요법의 치료 효과

이창연,하일수,정해일,최용,Lee Chang-Youn,Ha Il-Soo,Cheong Hae-Il,Choi Yong 대한소아신장학회 1997 Childhood kidney diseases Vol.1 No.2

목적 : 소아의 스테로이드 저항성 신증후군은 예후가 불량함에도 불구하고 지금까지 효과적인 치료방법이 없는 병이었으나 1990년 Mendoza등이 Methylprednisolone 충격 요법이 스테로이드 저항성 신증후군에서 효과적이라는 것을 보고하였다. 하지만 2년 뒤 Waldo 등은 Methylprednisolone 충격 요법이 Mendoza 등의 보고와는 다르게 스테로이드 저항성 신증후군에 효과가 적었다고 보고하여 이에 저자는 한국 소아에서 스테로이드 저항성 신증후군이 발생한 경우 Methylprednisolone 충격 요법의 효과를 알아보고 위의 보고의 서로 다른 결과를 확인하고자 본 연구를 시행하였다. 방법 : 1990년부터 1995년까지 만 5년간 서울대병원 소아과에 스테로이드 저항성 신증후군으로 입원한 소아를 대상으로 Methylprednisolone 충격 요법을 시행하여 $30{\pm}11$개월동안 추적 관찰하였다. 결과 : 1) Methylprednisolone 충격 요법 치료로 신증후군이 완해가 유도된 환아는 20명중 9명으로 45%이었다. 2) Methylprednisolone 충격 요법 치료후 신증후군의 완해가 유지된 환아는 20명중 9명으로 45%이었다. 3) Methylprednisolone 충격 요법에 반응이 없었던 환아중 만성 신부전으로 이행된 경우는 5례로서 25%이었다. 결론 : Methylprednisolone 충격 요법은 스테로이드 저항성 신증후군 소아의 45%에서 신증후군의 완해를 유도하고 유지시키는 효과적인 치료 방법이었다. Purpose : The Childhood Steroid Resistant Nephrotic Syndrome (SRNS) has a poor prognosis and there has been no effective therapy against SRNS of children. In 1990, Mendoza have reported that methylprednisolone pulse therapy was effective against SRNS of children. But in 1992, Waldo have reported that methylprednisolone pulse therapy was not as effective as in the report of Mendoza. So, retrospectively, we have studied 20 korean children with SRNS to evaluate the effect of methylprednisolone pulse therapy, Methods : Mothylprednisolone pulse therapy were given to 20 korean children with SRNS who admitted to Seoul National University Hospital from 1990 to 1995 and follow up was done Results : 1) During methylprednisolone pulse therapy, remission of nephrotic syndrome was induced in 45% of patients. 2) during follow up after the end of methylprednisolone pulse therapy, remission of nephrotic syndrome was maintained in 45% of patients. 3) 25% of patients has progressed to chronic renal failure. Conclusion : We think that the methylprednisolone pulse therapy is a effective therapy against SRNS of children with the 45%, remission rate of of SRNS in Korean Children

[가솔린엔진부문] 이중연료 공급 엔진을 이용한 LPG와 가솔린의 연소특성 비교

이창연(Changyoun Lee),이기형(Kihyung Lee),이창식(Changsik Lee) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_1

In this paper, we investigated the possibility of LPG as alternative fuel by comparison with gasoline. We designed the dual fuel supplier for LPG and gasoline in order to operate independently using each fuel. The MBT(minimum advance for best torque) data for every engine cod it ion was obtained to analyze the engine performance. In addition, combustion characteristics such as torque, pressure, combustion duration for each engine was measured to compare the engine performance between LPG and gasoline engine. The MBT of LPG is a little advance compared with that of gasoline at the same condition and !lame propagation speed of LPG is faster than that of gasoline. This characteristics made cycle by cycle variation smaller. However, we found that the power of LPG engine was reduced by decreasing of charge efficiency in the high speed region, and it made cycle by cycle variation become worse.

친환경 주택 성능평가 도구와 상세해석프로그램의 비교

이창연(Chang Yeon Lee),김병구(Byung Gu Kim),박소연(So Yeon Park),서승직(Seung Jik Suh) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7

In October of 2009, the Ministry of Land, Transport, and Maritime Affairs passed the law that obligated energy saving assessment for housings with more than twenty households as part of its campaign for low-carbon green growth. It set forth specific standards and assessment criteria through the notification of ‘No. 2009-1014 Construction Standard and Performance of Environmentally-friendly Housing’. This study compares EnergyPlus, an evaluation tool for environmentally-friendly house performance, with TRNSYS, a detail interpretation program that analyzes building energy consumption. With the comparison, the study aims to identify the unique characteristics of the two tools in assessing environmentally-friendly housings. As assessment targets, the study designated the 84 ㎡ type ? the housing most prevalent in Korea. Heating loads were compared according to changes in wall U-values, window U-values, and orientation.

40W급 LED 평면 조명기구의 광특성 비교평가에 관한 연구

이창연(Chang-Yeon Lee),천석희(Suk-Hee Chun),황명근(Myung-Keun Hwang) 한국조명·전기설비학회 2017 한국조명·전기설비학회 학술대회논문집 Vol.2017 No.5

BIPV의 커버 유리의 열처리 방법에 따른 기능성 코팅의 오염방지 특성

이창연(Changyeon Lee),최혁주(Hyeokjoo Choi),정세진(Sejin Jung),최원석(Wonseok Choi) 한국태양에너지학회 2019 한국태양에너지학회 학술대회논문집 Vol.2019 No.4

고도근시에서의 각막절삭술의 결과

이창연(Chang Yeun Lee),김응권(Eung Kweon Kim),김홍복(Hong Bok Kim) 대한안과학회 1996 대한안과학회지 Vol.37 No.3

공막돌융술후 발생한 굴절이상의 변화

이창연(Chang Yeun Lee),이성철(Sung Chul Lee) 대한안과학회 1992 대한안과학회지 Vol.33 No.5