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비행시뮬레이션에서 프레임율과 현실감을 고려한 계층형 구름 구현 방안
강석윤,김기일,Kang, Seok-Yoon,Kim, Ki-Il 한국정보통신학회 2014 한국정보통신학회논문지 Vol.18 No.1
비행 시뮬레이션 소프트웨어 개발 시 구름효과 구현을 위한 대표적인 연구로는 파티클 시스템을 이용한 구름 모델링과 텍스쳐 맵핑을 이용한 구름판 모델링이 있다. 하지만 전자의 경우 낮은 프레임율을 야기하는 반면, 후자의 경우는 비행 시 현실감이 떨어지는 문제가 있다. 이를 해결하기 위해 본 논문에서는 구름판 모델링 방법에 현실적 효과를 더 할 수 있도록 카메라에 안개효과를 적용하는 방안을 제안한다. 제안한 방안을 OpenSceneGraph를 사용한 대용량의 맵 데이터베이스 환경에서 실험 한 결과 기존의 구름판 모델링 방법에 비해 1~2Hz 정도로써 프레임은 거의 차이가 없었고, 현실적 효과 측면에서는 파티클을 이용한 구름 모델링 방법과 비슷하게 자연스럽고 현실적인 효과를 보였다. There are two main technologies to implement cloud effect in flight simulator, cloud modeling using particle system and texture mapping. In former case, this approach may cause a low frame rate while unrealistic cloud effect is observed in latter case. To Solve this problem, in this paper, we propose how to apply fog effect into camera to display more realistic cloud effect with high frame rate. The proposed method is tested with massive terrain database environment through implemented software by using OpenSceneGraph. As a result, compared to texture mapping method, the degree of difference on frame rate is 1 or 2Hz while the cloud effect is significantly improved as realistic as particle system.
항 흉선세포 말형청글로불린에 대한 즉시형 과민증의 예측에 있어서 피부반응시험과 특이 IgE 항체검사의 임상적 유용성
이현주(Hyun Joo Lee),임의진(Eui Jin Yim),지서영(Seo Young Ji),강석윤(Seok Yoon Kang),서유진(Yu Jin Suh),조재웅(Jae Woong Cho),김선신(Sun Sin Kim),이수걸(Soo Keol Lee),남동호(Dong Ho Nahm),박해심(Hae Sim Park),김현수(Hyun Soo Kim),남동기 대한천식알레르기학회 2000 천식 및 알레르기 Vol.20 No.6
N/A Background: Horse antithymocyte globulin (ATG) is a useful treatment for aplastic anemia and for bone marrow transplantation from HLA-mismatched donors, Mortality due to anaphylactic reaction to horse ATG has been reported. We evaluated the clinical significance of skin test and specific IgE measurement for the prediction of immediate type hypersensitivity reaction to horse ATG. Subjects and methods : The study subjects consisted of 25 patients who received horse ATG. Underlying diseases of the 25 patients included aplastic anemia (n=20), leukemia (n=3), lymphoma (n=1), and Gaucher's disease (n=1). Skin prick test was done on these patients using undiluted ATG solution (Upjohn, USA) with duplication. Specific IgE to ATG was detected by enzyme-linked immunosorbent assay and immunoblot analysis. Results : Skin prick test was positive in 7 (28%) of 25 patients. None of the patients showing negative skin prick test experienced immediate type hypersensitivity reaction to ATG. All patients showing positive skin prick test received desensitization before the administration of a full dose of ATG. However, 3 of 7 patients showing positive skin prick test experienced immediate type hypersensitivity reaction one of them died of anaphylaxis. Specific IgE measurement using enzyme-linked immunosorbent assay was not useful in predicting immediate type hypersensitivity reaction to ATG because of nonspecific bindings. Specific IRE measurement using immunoblot analysis was only positive in the one patient who died of anaphylaxis. Conclusion : Skin prick test was clinically useful in the prediction of irnmediate type hypersensitivity reaction to horse ATG, but specific IgE measurement was not. Further studies might be needed to develop an in vitro test for the prediction of immediate type hypersensitivity reaction to horse ATG. (J Asthma Allergy Clin Immunol 20: 986-42, 2000)
증례 : 특발성후복막섬유증 2예에 대한 양전자방출단층촬영의 유용성
박태진 ( Tae Jin Park ),이명희 ( Myoung Hee Lee ),김형일 ( Hyoung Il Kim ),강석윤 ( Seok Yun Kang ),최진혁 ( Jin Hyuk Choi ),김효철 ( Hugh Chul Kim ),윤석남 ( Seok Nam Yoon ) 대한내과학회 2006 대한내과학회지 Vol.71 No.6
Idiopathic retroperitoneal fibrosis is a relatively rare disease that is characterized by the proliferation of fibrous tissue with an inflammatory process in the retroperitoneal cavity. It can cause an obstruction and compression of the ureter, abdominal aorta, and finally progress to renal failure. During the initial stages, the histology shows active inflammation. However, in the late stages, fibrous scarring occurs and the tissue becomes relatively avascular and acellular. Increased 18F-FDG accumulation was observed in our patient at the time of disease onset, which was attributed to the presence of inflammatory cells and actively metabolizing fibroblasts. We describe two patients with idiopathic retroperitoneal fibrosis, who were examined by 18F-FDG-PET, and discuss the efficiency of positron emission tomography in the diagnosis and management of idiopathic retroperitoneal fibrosis patients. (Korean J Med 71:688-693, 2006)