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인명.재해 피해 저감을 위한 폭염특보기준 검토 및 보완에 관한 연구
박종길,정우식,송정희,김은별,Park. Jong-Kil,Jung. Woo-Sik,Song. Jeong-Hui,Kim. Eun-Byul 한국방재학회 2008 한국방재학회 학술발표대회논문집 Vol.2008 No.1
The extreme heat watch warning system(EHWWS) that Korea Meterological Administration carried out a preliminary from July 1, 2007, considered both daily maximum temperature and daily maximum heat index simultaneously. It was requested revision of the standard level of EHWWS to solve the difficulty of forecasting occurred when we were considering two parameters simultaneously and we did not considering heat index according to areas. For this, we established three type standard, such as type 1 that considered both daily maximum temperature and daily maximum heat index, Under the extreme heat day that daily minimum temperature was more than <TEX>$25^{\circ}C$</TEX>, type 2 that considered daily maximum temperature and type 3 that considered only daily maximum heat index and then analyzed whether these 3 types satisfies the excess mortality of the extreme heat warning or not. As a results, type 1 and 2 were more explain away excess mortality each warning step than type 3. type 2 could also apply case of not to consider heat index according to areas and had a merit for extreme heat forecasting easily because the standard was simple. Therefore we think type 2 is more suitable and reasonable standard for Korea extreme heat watch warning system(KEHWWS) than type 1. In addition, we need to develop model that exactly predicts the excess mortality will be take place during the extreme heat warning and construct KEHWWS.
Water Flow Model을 이용한 문서 영상의 이진화
김인권,정동욱,송정희,박래홍,Kim, In-Gwon,Jeong, Dong-Uk,Song, Jeong-Hui,Park, Rae-Hong 대한전자공학회 2001 電子工學會論文誌-SP (Signal processing) Vol.38 No.1
본 논문에서는 영상의 밝기 값을 마치 3차원 지형과 같은 개념으로 간주하여 여기에 물이 흐르는 개념을 적용하여 국부 적응 (locally adaptive) thresholding 방법을 제안하였다. 문자를 추출해내기 위해 제안한 방법에서는 지형 표면에 물을 붓는 과정을 수행하였다. 물은 지형의 낮은 곳으로 흐르게 되어 계곡 (valley)에 쌓인다. 이때 문자와 배경으로 구성된 문서영상에서 쌓인 물의 양을 기준으로 두 개의 영역을 구분을 하였다. 제안한 water flow model의 개념을 적용한 threholding 방법은 국부 적응 thresholding의 특성을 나타낸다. 합성 영상과 실제 영상을 이용하여 전산 모의 실험을 수행함으로써 제안한 방법이 문서 영상을 효과적으로 이진화할 수 있음을 보였다. This paper proposes a local adaptive thresholding method based on a water flow model, in which an image surface is considered as a 3-dimensional (3-D) terrain. To extract characters from backgrounds, we pour water onto the terrain surface. Water flows down to the lower regions of the terrain and fills valleys. Then, the amount of filled water is thresholded, in which the proposed thresholding method is applied to gray level document images consisting of characters and backgrounds. The proposed method based on a water flow model shows the property of locally adaptive thresholding. Computer simulation with synthetic and real document images shows that the proposed method yields effective adaptive thresholding results for binarization of document images.
이건일,김인권,정동욱,송정희,곽원기,박래홍,Lee, Geon-Il,Kim, In-Gwon,Jeong, Dong-Uk,Song, Jeong-Hui,Gwak, Won-Gi,Park, Rae-Hong 대한전자공학회 2001 電子工學會論文誌-SP (Signal processing) Vol.38 No.4
본 논문에서는 영상의 그래디언트 (gradient)를 구하여 그래디언트 값의 분포를 마치 3차원 지형과 같은 개념으로 간주하고 여기에 물이 흐르는 개념을 적용한 에지 (edge) 검출 방법을 제안하였다 영상에서 그래디언트 값이 큰 부분은 배경과 객체간의 에지라 볼 수 있으며, 이 에지에 물이 고이게 하기 위해서는 반전된 그래디언트 영상을 사용한다. 반전된 그래디언트 영상에서 물의 흐름을 기반으로 한 enhancing 작업과 국부적응 임계값 적용을 실시하여 잡음을 줄인 에지 영상을 찾는 방법을 제안한다. 합성영상과 실제영상에 대한실험을 통해 제안한 방법의 효율성을 검증하였다. In this paper, we propose a flew edge detection method based on water flow model, in which gradient image surface is considered as a 3-dimensional (3-D) geographical feature. The edges of the objects in the background can be detected by the large gradient magnitude areas and to make the edges immersed it is required to invert the gradient image. The proposed edge detector uses a water flow model based enhancement and locally adaptive thresholding technique applied to the inverted gradient image resulting in better noise performance. Computer simulations with a few synthetic and real images show that the Proposed method can extract edge contour effectively.
박종길,정우식,김은별,송정희,Park. Jong-Kil,Jung. Woo-Sik,Kim. Eun-Byul,Song. Jeong-Hui 한국방재학회 2008 한국방재학회 학술발표대회논문집 Vol.2008 No.1
In order to examine the influences by the extreme weather changes on the human physical conditions, we need to undertake human biometeorology research such as the assesment on the extreme heat`s influences on human health. Most of the preceding studied have been found to be focused on the influences by extreme heat on the human body, they used statistics on the daily mortality. But thismethod estimate an indirectly influences by extreme heat on the human body. So, to be able to predict the possible directly influences by the extreme heat on the physical conditions. We measure thermal stress by extreme heat.
폭염시기 인명 피해 예방을 위한 폭염특보기준 설정에 관한 연구
박종길,정우식,김은별,송정희,Park. Jong-Kil,Jung. Woo-Sik,Kim. Eun-Byul,Song. Jeong-Hui 한국방재학회 2008 한국방재학회 학술발표대회논문집 Vol.2008 No.1
Recently, occurrence frequency of natural disaster decrease but scale of damage increase remarkably by the Climate change due to global warming. Especially, extreme heat become more critical wether problem in the Korean Peninsula. But, we don`t have exact threshold about extreme heat. Therefore, to assess the influences by the extreme heat on personal injury, we analyzed statistics on the causes of the daily mortality. And we developed a threshold for extreme heat health watch warning system.