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문자 별 특징 모델을 이용한 한글 문서 영상에서 키워드 검색
박상철,김수형,최덕재,Park, Sang-Cheol,Kim, Soo-Hyung,Choi, Deok-Jai 한국정보처리학회 2005 정보처리학회논문지B Vol.12 No.5
본 논문에서는 저 품질의 한글 문서 영상에서 OCR 기반 검색 시스템의 대안으로 키워드 검출 시스템(Keyword Spotting)을 제안하고 OCR 기반 문서 검색 시스템과 비교한다. 제안 시스템은 문자 분할, 키워드 특징 추출 그리고 단어 매칭으로 구성된다. 문자 분할 단계에서는 인접한 두 문자간의 연결을 효과적으로 분리하면서 문자 넓이 값의 분산이 최소가 되도록 하는 문자 분할 방법을 제안한다. 키워드 특징은 서체별 문자 모델의 결합으로 구성한다. 단어 매칭 단계에서는 문자 매칭에 기반한 단어 대 단어 매칭 방법을 적용한다. 본 논문에서 제안한 키워드 검출 시스템의 성능을 평가하기 위해 한글 문서 영상을 대상으로 OCR 기반 문서 검색 시스템과 비교하였다. 그 결과 한글 글자 크기가 작고 문서의 상태가 좋지 않은 경우 제안한 키워드 검출 시스템에 의한 검색 성능이 OCR 기반 검색 시스템 보다 우수함을 입증하였다. In this Paper, we propose a keyword spotting system as an alternative to searching system for poor quality Korean document images and compare the Proposed system with an OCR-based document retrieval system. The system is composed of character segmentation, feature extraction for the query keyword, and word-to-word matching. In the character segmentation step, we propose an effective method to remove the connectivity between adjacent characters and a character segmentation method by making the variance of character widths minimum. In the query creation step, feature vector for the query is constructed by a combination of a character model by typeface. In the matching step, word-to-word matching is applied base on a character-to-character matching. We demonstrated that the proposed keyword spotting system is more efficient than the OCR-based one to search a keyword on the Korean document images, especially when the quality of documents is quite poor and point size is small.
용접부 피로강도를 고려한 굴삭기 붐 구조물 설계(II)
박상철,Park, Sang-Chul 대한용접접합학회 2011 대한용접·접합학회지 Vol.29 No.4
The purpose of this study is to develop improved boom structures with reliable fatigue strength of weldment and lower production cost. For that purpose, multi-body dynamic analysis was performed to evaluate forces acting on arm & boom cylinders and joints of boom structure during operation of an excavator for three working postures, then stress analysis was made to investigate stress distribution around diaphragms at the bottom plate of boom structures which was known to be susceptible to fatigue failures of welded joints, and finally boom structures with optimum arrangement of diaphragms was proposed. This work mainly consists of the following two parts: part 1 focuses on multi-body dynamic analysis of excavators during operation and part 2 includes evaluations of fatigue strength of welded joints for modified boom structures.
Guinea pig에서 alcohol과 paraquat에 의한 간독성에 미치는 selenium의 방어 효과
박상철,강형섭,이호일,김진상,Park, Sang-chul,Kang, Hyung-sub,Lee, Ho-il,Kim, Jin-sang 대한수의학회 1996 大韓獸醫學會誌 Vol.36 No.2
Experiments were undertaken to examine the ability of selenium to protect against alcohol and/or paraquat-induced hepatotoxicity and to examine the additive effect between alcohol and paraquat. Protective effect against hepatotoxic functions was measured in serum from alcohol(15% v/v), paraquat(200ppm), alcohol and paraquat, and combination of sodium selenite(4ppm) in drinking water-fed guinea pigs ad libitum for 4 weeks. A total of 68 healthy 7-weeks-old male animals were assigned at random to 8 treatment groups(9~13 animals/group). Body and liver weight losses, and high serum concentrations in aspartate aminotransferase(AST), alanine aminotransferase(ALT, in only paraquat group), $\gamma$-glutamyltranspeptidase($\gamma$-GTP), cholesterol(Cho), creatinine, blood urea nitrogen(BUN), total bilirubin(TB), direct bilirubin(DB), total protein(TP), albumin and globulin as well as low values in alkaline phosphatase(ALP) and glucose were produced in a groups of alcohol or paraquat-fed. These values were not potentiated in a group given the combination of alcohol plus paraquat. Morphological changes in the liver were also observed in the alcohol or paraquat-fed group. Lipid droplet and cell swelling in the hepatocytes were observed in alcohol-fed guinea pig, especially Mallory's hyaline arounded hepatic vein. In the paraquat-fed guinea pig, lipid droplet, pyknosis and karyolysis were observed. When alcohol or paraquat was combined with selenium-fed, hyperplasia of Kupffer cell in liver were observed. However, the mean ALT, $\gamma$-GTP, Cho, BUN, TB, TP, albumin and globulin values were lower in groups given the combination of alcohol and/or paraquat plus selenium, compared with groups given alcohol and/or paraquat. Also, the ratio of liver weight to body weight and ALP values(exception of paraquat plus selenium group) were increased by selenium. These results suggest that an adequate selenium confers marked protection against alcohol and paraquat-induced hepatotoxicity.
박상철,Park, Sang-Cheol 한국건강관리협회 2004 한국건강관리협회지 Vol.2 No.1
노화란 개념을 불가피하고 비가역적인 생체의 변화를 거쳐서 죽음에 이르는 도정이라는 피동적이고 자포자기적인 결정론적 시각을 불식하고, 노화가 생명체의 생존을 위한 적응적 반응성 변화이며, 그러한 변화의 요인이 충분히 제어가 가능한 생체의 변화임을 밝히고자 한다. 또한, 기능적 장수(Functional Longevity)라는 새로운 개념을 제안하고, 이러한 기능적 장수를 추구함에 있어서 장수문화와 장수과학의 정립이 시급함을 강조하였다.