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수치지형정보를 애용한 지형의 3차원 표현 software 개발
이규석 한국조경학회 1990 韓國造景學會誌 Vol.17 No.3
The digital terrain model (DTM) or digital elevation model (DEM) is commonly used in representing the continuous variation of relief over space. One of the most frequent applications is to display the three dimensional view of the landform concerned. In this paper, the altitude matrices-regular grid cell format of the elevation in Mt. Kyeryong National Park were used in developing the three dimensional view software for the first time in Korea. It required the removal of hidden lines or surfaces. To do this, it was necessary to identify those surfaces and line segments that are visible and those that are invisible. Then, only the visible portions of the landform were displayed. The assumption that line segments are used to approximate contour surfaces by polygons was used in developing the three dimensional orthographic view. In order to remove hidden lines, the visibility test and masking algorithms were used. The software was developed in the engineering workstation, SUN 3/280 at the Institute of Space Science and Astronomy using 'C' in UNIX operating system. The software developed in this paper can be used in various fields. Some of them are as follows : (1) Landscape design and planning for identifying viewshed area(line of sight maps) (2) For planning the route selection and the facility location (3) Flight simulation for pilot training (4) Other landscape planning or civil engineering purposes
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전신 광화학요법으로 치료받는 환자들에 대한 피부과 및 안과 검진 결과
이규석,김지욱,김기산 대한피부과학회 2001 大韓皮膚科學會誌 Vol.39 No.7
Background: Systemic PUVA therapy is a widely used method for treatment of vitiligo and psoriasis. However, there have been few studies concerning complications of systemic PUVA therapy. Objective: We examined the dermatological and ophthalmologic manifestations in-patients receiving PUVA therapy. Method: We studied 42 patients who received systemic PUVA therapy for more than six months in our department. Results the results are summarized as follows l. Among the 42 patients, the number of male and female patients were 18 (42.9%) and 24 (57.1%) respectively. The mean age at the start of PUVA was 42 years and mean cumulative UVA dace was 996 J/cm?. 2. Among the 42 patients, hyperpigmentation found in 9 (21.4%), PUVA lento in 8 (19.0%), prorates in 5 (11.9%) and burn in 3 (7.1%). 3. The ophthalmologic manifestations were conjunctivitis (13 cases, 31.0%), pteygium (7 cases, 16.7%), pingueculum (6 cases, 14.3%) and cataract (3 cases, 7.1%). Conclusion. Long term exposure to PUVA causes chronic clinical side effects of PUVA. Therefore careful follow-up of patients who receive long term PUVA therapy is necessary.
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