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이승환,박병문,송경섭,이수건,윤상필,이재철,이범석,양봉석 대한척추외과학회 2017 대한척추외과학회지 Vol.24 No.1
Study design: Retrospective study. Objectives: The goal of this study was to evaluate the risk factors of osteoporotic vertebral fractures (OVFs) in patients with Cushing syndrome. Summary of Literature review: In most reports, vertebral fractures in Cushing syndrome have been found to be related to osteoporosis. However, few studies have analyzed the clinical risk factors for OVFs. Materials and Methods: Thirty-two patients with Cushing syndrome who visited the orthopaedic department complaining of back pain were included in this study. Standing lateral X-rays were performed to evaluate the presence of vertebral fractures, and bone mineral density (BMD) was measured. Results: Of the 32 patients with Cushing syndrome with back pain, 8 (25%) were diagnosed with OVFs using morphometric criteria. The average weight and body mass index of the vertebral fracture group (VF group) were significantly higher than the values observed in the non-vertebral fracture group (non-VF group) (p=0.004, p=0.018). Lumbar BMD was significantly lower in the VF group (p=0.006). A risk factor for OVFs in Cushing syndrome was osteoporosis (odds ratio=18.56, 95% confidence interval=1.72-200.21, p=0.016) regardless of gender, obesity, menopause, or urine free cortisol levels. Conclusions: OVFs in Cushing syndrome have been associated with overweight, and overweight is an indicator of compliance in the treatment of Cushing syndrome. Therefore, weight reduction and the prevention of osteoporosis should be emphasized in patients with Cushing syndrome to prevent OVFs. 쿠싱 증후군에서 골다공증성 척추 골절의 위험 인자이승환 • 박병문 • 송경섭 • 이수건 • 윤상필 • 이재철 • 이범석 • 양봉석광명성애병원 정형외과연구 계획: 후향적 연구목적: 쿠싱 증후군에서 증상이 있는 골다공증성 척추 골절의 유병률을 조사하고, 골다공증성 척추 골절의 위험 인자를 분석하였다. 선행문헌의 요약: 쿠싱 증후군에서 척추 골절은 대부분은 골다공증과 연관이 있었다. 그러나 척추 골절의 다른 위험 인자에 대해 분석한 연구는 거의 없었다. 대상 및 방법: 요통으로 정형외과 외래에 내원한 32명의 쿠싱 증후군 환자를 대상으로 하였다. 흉요추부 기립위 측면 방사선을 촬영하여 척추 골절을 진단하였고, 척추와 대퇴 경부의 골밀도를 측정하였다. 척추 골절 그룹과 비골절 그룹의 통계학적 차이를 paired t-test를 이용해 비교하였고, 위험인자 분석을 위해 로지스틱 회귀 분석을 사용하였다. 결과: 전체 32명의 환자중 8명(25%)의 환자에서 골다공증성 척추 골절이 확인되었다. 척추 골절군의 평균 체중과 체질량 지수가 비골절군에 비해 유의하게 높았으며(p=0.004, p=0.018), 척추 골절군의 요추부 골밀도가 비골절군에 비해 유의하게 낮았다(p=0.006). 골다공증성 척추 골절의 위험 인자는 골다공증으로 나타났다(odds ratio 18.56, 95%CI 1.72-200.21, p=0.016). 결론: 쿠싱 증후군 환자에서 척추 골절의 발생은 과체중과 관련이 있으며, 과체중은 평소 쿠싱 증후군의 부적절한 치료로 인한 상태를 반영하는 지표라고할수 있다. 그러므로, 적절한 내분비적 치료를 통계 적정 체질량을 유지하고, 골다공증의 약물 치료를 병행하는 것이 쿠싱 증후군의 척추 골절 예방에 중요하다고 하겠다. 색인 단어: 쿠싱 증후군, 척추 골절, 골다공증약칭 제목: 쿠싱 증후군과 척추 골절
이승환,이성재,이원용 한국목재공학회 1993 목재공학 Vol.21 No.4
In the present paper, we discribed distributions patterns of pits on the tracheids of Pinus koraiensis. The number of bordered pits on a tracheid is more numerous than that of cross-field pittings. And they appeared different in the number depending on the shape and size of tracheids. Both pit and cross-field pitting on a tracheid is fewer in number near the pith. The number of bordered pits on the tracheid increased rapidly from pith toward cambial zone but that of cross-field pittings increased gradually. The number of bordered pit and corns-field pitting is more frequent in the first-formed tracheid, and the number of bordered pit decreased rapidly from earlywood to latewood but that of corss-field pittings decreased gradually. Bordered pits on a tracheid are more numerous at the end of tracheids and cross-field pittings occur more frequently in the center part of a tracheid.
공공기념공간의 인터페이스 분석을 통한 복합적 소통구조 제안
이승환,김영찬,Lee, Seung-Hwan,Kim, Young-Chan 한국미술이론학회 2009 미술이론과 현장 Vol.8 No.-
Space is a phenomenon which is formed in the connection between environment and human beings and public space is built by a complex phenomenon of space. Each and every individual is connected to an environment and these individuals are connected to one another. A public commemorative space means souvenir and memorial which is designed for special purpose of remembrance of a specific area. One of the purposes of public commemorative space is memorial and that is the reason of doing public relation and educating citizens over the transom. However, the meaning and value of commemorative subject cannot be delivered or stuffed one-sidely. The target who receives messages from public commemorative space has reinterpreted the messages of his own with his personal experience, knowledge and sensitivity. It results in an unexpected phenomenon of public commemorative space. Therefore, public commemorative space should be considered in a mutual communication structure rather than a purpose of memorial itself. Korean public commemorative space is focused on public relation and education for memorial. In other words, Korean public commemorative space is neglected its important possibility of the productive chapter of mutual communication. The mutual communication structure of public commemorative space which is based on variety and haecceity is ripped up by the message over the transom. It destroys the self-control and creativity of public commemorative space, and derives a negative result. By studying the function and meaning of public commemorative space, we should make the best use of it.
이승환,조한선,최기주 대한교통학회 1996 大韓交通學會誌 Vol.14 No.1
This paper presents a heuristic algorithm for classifying vehicles using a single loop detector. The data used for the development of the algorithm are the frequency variation of a vehicle sensored from the circle-shaped loop detectors which are normal buried beneath the expressway. The pre-processing of data is required for the development of the algorithm that actually consists of two parts. One is both normalization of occupancy time and that with frequency variation, the other is finding of an adaptable number of sample size for each vehicle category and calculation of average value of normalized frequencies along with occupancy time that will be stored for comparison. Then, detected values are compared with those stored data to locate the most fitted pattern. After the normalization process, we developed some frameworks for comparison schemes. The fitted scales used were 10 and 15 frames in occupancy time(X-axis) and 10 and 15 frames in frequency variation (Y-axis). A combination of X-Y 10-15 frame turned out to be the most efficient scale of normalization producing 96 percent correct classification rate for six types of vehicle.