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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.
전층피부창상에서 실크피브로인과 하이알론산 혼합 스폰지의 창상치유효과
강석윤,노대현,김현우,윤서연,권영배,권해용,이광길,박영환,이장헌,Kang, Seuk-Yun,Roh, Dae-Hyun,Kim, Hyun-Woo,Yoon, Seo-Yeon,Kwon, Young-Bae,Kweon, HaeYong,Lee, Kwang-Gill,Park, Young-Hwan,Lee, Jang-Hern 대한수의학회 2006 大韓獸醫學會誌 Vol.46 No.4
The primary goal of the wound healing is rapid wound closure. Recent advances in cellular and molecular biology have greatly expanded our understanding of the biologic processes involved in wound repair and tissue regeneration. This study was conducted to develop a new sponge type of biomaterial to be used for either wound dressing or scaffold for tissue engineering. We designed to make a comparative study of the wound healing effect of silk fibroin/hyaluronic acid (SF/HA) blend sponge in full-thickness dermal injury model of rat. Two full-thickness excisions were made on the back of the experimental animals. The excised wound was covered with either the silk fibroin (SF), hyaluronic acid (HA) or SF/HA (7 : 3 or 5 : 5 ratio) blend sponge. On the postoperative days of 3, 7, 10 and 14, the wound area was calculated by image analysis software. Simultaneously, the tissues were stained with Hematoxylin-Eosin and Masson's trichrome methods to measure the area of regenerated epithelium and collagen deposition. In addition, we evaluated the degree of the epithelial cell proliferation using immunohistochemistry for proliferating cell nuclear antigen (PCNA). We found that the half healing time ($HT_{50}$) of SF/HA blend sponge treated groups were significantly decreased as compared with either those of SF or HA treatment group. Furthermore, SF/HA blend sponges significantly increased the size of epithelialization and collagen deposition as well as the number of PCNA positive cells on epidermal basement membrane as compared with those of control treatment. Especially, the 5 : 5 ratio group of SF/HA among all treatment groups was most effective on wound healing rate and histological studies. These results suggest that SF/HA blend sponges could accelerate the wound healing process through the increase of epithelialization, collagen deposition and basal cell proliferation in full thickness skin injury.
강석윤 ( Seok Yun Kang ) 대한내과학회 2017 대한내과학회지 Vol.92 No.3
The treatment of metastatic breast cancer depends on the patient`s condition, site of metastasis, and molecular subtype of cancer. Hormone receptor-positive patients, which account for 60-70% of all breast cancer patients, have the advantage of having an effective, less-toxic, hormone therapy treatment. Hormone therapy should be used actively because it is very useful in terms of the patient`s quality of life, by increasing the response rate and delaying the progression of cancer. Recently, studies have examined the mechanism of resistance to hormone therapy. We need to combine various target therapies to overcome resistance. The development of therapeutic agents based on molecular biological characteristics should help to improve the survival of patients with metastatic breast cancer. (Korean J Med 2017;92:251-258)
한국전기설비규정(KEC) 부합화 공동주택 접지설계 프로세스에 대한 고찰
강석윤(Suk-Yun Kang) 한국조명·전기설비학회 2021 한국조명·전기설비학회 학술대회논문집 Vol.2021 No.11
In this paper, model for applying the grounding design process for an apartment building that conforms to the KEC was propose. The adequacy of the pilot complex was confirmed.