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수막 혈관주위세포종의 임상상, 치료 및 장기 추적 결과
이준호,황승균,곽호신,백선하,김동규,김현집,정희원,Lee, June-Ho,Hwang, Sung-Kyun,Gwak, Ho-Shin,Paek, Sun Ha,Kim, Dong Gyu,Kim, Hyun Jib,Jung, Hee-Won 대한신경외과학회 2001 Journal of Korean neurosurgical society Vol.30 No.7
Objectives : Meningeal hemangiopericytoma is a rare tumor. Clinical and radiological features are similar to those of an ordinary meningioma. But its biological behavior is quite different from those of a meningioma as it brings profuse bleeding in the operation field, frequent recurrence and metastasis to other systemic organs even in the case of gross total resection. In order to find out the prognostic factors and to compare longterm outcome after various treatment modalities, the authors reviewed consecutive 20 operated cases of meningeal hemangiopericytoma to characterize their clinical features, surgical outcomes and effectiveness of the radiation therapy. Methods : Twenty patients with a hemangiopericytoma were treated between 1982 and 1999 in our department. They are composed of 13 patients of hemangiopericytoma and 7 patients who were initially diagnosed as angioblastic type meningioma and then confirmed as a hemangiopericytoma after review of their previous histopathology slides. The mean follow-up period was 99 months(1-256 months). The long-term outcomes after various treatment modalities were evaluated according to recurrence-free survival and image follow-up. Recurrence-free survival curves are compared between the patient groups according to the extent of removal and radiation therapy. Results : There were 10 cases of recurrence and 4 cases of distant metastases ; lung, liver and femur(2 cases) respectively. The 5-year recurrence rate was 37%, while the 10-year recurrence rose to 77%. There was also statistically significant difference of median recurrence-free survival between the completely-resected group(Simpson grade 1 or 2) and partially-resected group(Simpson grade 3 or 4 or 5) ; 137 months compared to 47 months, respectively(p=0.009). The median recurrence-free period after subtotal resection of tumor and postoperative radiotherapy was 47 months compared to 117 months of the patients who underwent gross total resection of tumor and did not receive radiotherapy. But radiation therapy alone did not show significant difference in recurrence-free survival. Marked tumor volume reduction and easy removal of tumors without bleeding were found in 2 recurred cases. Conclusion : The extent of tumor resection and presence of metastasis are the most important factors related to long-term outcome of the patients with hemangiopericytoma. Radiation therapy after the first operation did not have a role in extending the recurrence-free survival, but it affected favorably to decrease the size of residual mass and intraoperative bleeding during the second operation.
재활용 가능한 폴리에틸렌과 폴리프로필렌의 전도도 온도의존성과 전력케이블 내의 전계분포에 미치는 영향
이준호(June-Ho Lee),공태식(Tae-Sik Kong),김성중(Seong-Jung Kim),권기형(Ki-Hyung Kwon),조규철(Kyucheol Cho),穗積直裕(Naohiro Hozumi) 대한전기학회 2011 전기학회논문지 Vol.60 No.10
In this work the recyclable new polyethylene(PE) and polypropylene(PP), which are thermoplastic, have been investigated as the eco-friendly insulating candidates to replace the cross-linked polyethylene (XLPE). The temperature dependence of conductivities of these materials has been measured and its effects on electric field and space charge distribution in polymeric insulated power cable under temperature gradient have been calculated. It is shown that the sensitivity of conductivity to temperature change has more critical influence to determine the electric field distribution in the power cable than the absolute value of conductivity does and it can be said that the temperature dependence is one of most important factors for the power cable design.
이준호(June - Ho Lee),이진우(Chin - Woo Yi) 호서대학교 공업기술연구소 2002 공업기술연구 논문집 Vol.21 No.1
T his paper introduces a fluorescent lam p m odel based on gas discharge phenom ena. The fluorescent lam p discharge has been successfully m odeled by em ploying the radial variation of particle density and considering d riving circuit effects on the characteristics of discharge process. T he electron energy distribution is assum ed to have a M axw ellian. T he electron m obility and the am bipolar diffusion coefficients are considered to vary w ith an electron energy rather than a sim ple uniform value. Energy states of m ercury atom in the discharge process are regarded as six levels rather than sim ple 4 or 5 levels. These discharge processes have been accurately solved by num erically em ploying m ixed the F D M and the 2nd R ung e- K utta method. W e applied this m odel to analyzing real high frequency circuit. S im ulation and experim ental results were presented to verify the feasibility of the m odeling. Sim ulation and experim ental results were presented to verify the feasibility of the m odeling.
고층 공동주택에서 주요 요소별 기밀성능에 따른 연돌효과 영향도 분석에 관한 연구
이준호(June Ho Lee),방윤시(Yinshi Pang),송두삼(Doo Sam Song) 대한설비공학회 2017 대한설비공학회 학술발표대회논문집 Vol.2017 No.6
본 연구에서는 고층 주거건물에서 연돌효과 분석을 위해 사용되는 각 요소에 대한 기밀성능을 국내외 문헌조사를 통해 검토하고, 시뮬레이션 기법을 통해 각 요소가 건물 내 연돌효과에 미치는 영향을 분석하고자 하였다. 이를 위해 건물 내 5가지 주요 요소에 대한 중성대의 위치 변화를 분석하였고, 그 결과 세대 현관문의 기밀 성능 변화에 따라 최대 10개 층의 중성대 위치 변화가 발생하였으며, 중성대 위치 변화에 약 53%의 영향도를 보이는 것으로 나타났다. 이처럼 고층 건물의 연돌효과 분석을 위해 제시되는 각 요소의 기밀성능에 따라 중성대의 위치가 달라 질 수 있으므로, 정량적인 연돌효과 해석을 위해서는 요소별 적정 기밀성능 값을 기준으로 시뮬레이션 할 필요가 있다.