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베이지안 추론 방법을 이용한 새로운 그래프 매칭방법과 영상검색
박상철(Sang Cheol Park),조완현(Wan Hyun Cho),김선월(Sun Worl Kim),김수형(Soo Hyung Kim),나인섭(In Seop Na) 한국정보과학회 2013 정보과학회논문지 : 소프트웨어 및 응용 Vol.40 No.2
정확하고 효과적인 그래프 매칭 기법은 그래프 매칭을 이용한 내용기반 검색 시스템에서는 매우 중요하다. 우리는 베이즈(Bayes) 이론과 디리쉴레(Dirichlet) 분포를 이용한 새로운 그래프 매칭 알고리즘과 이를 이용한 영상 검색 시스템을 제안한다. 이를 위해 먼저 각 영상은 검출자(detector)에 의해 그래프로 표현되며, 그래프의 에지(edge)는 서술자(descriptor) 간의 거리로 나타낸다. 그런 후, 베이즈 이론과 디리쉴레 분포에 의해 두 그래프의 정점(검출자) 간의 매칭 정도를 나타내는 매칭행렬이 계산된다. 마지막으로 매칭행렬로 부터 볼록 최적화 알고리즘에 의해 최적 매칭관계를 찾는다. 여기서, 영상의 그래프표현은 다양한 변형에 강인한 MSER 영역 검출자와 스케일과 회전에 강인한 SIFT 서술자가 이용된다. 두 영상의 유사도는 검출자들 사이의 서술자를 이용한 상관계수로 대체된다. 영상 검색은 질의 영상과 데이터베이스의 모든 영상들을 매칭하여 유사도가 가장 높은 영상을 선택함으로써 수행된다. 우리는 제안 시스템의 평가를 위해 COIL-20 데이터베이스를 이용하였으며, 스펙트럴 매칭(spectral matching)을 이용한 검색 시스템과 비교하였다. 실험 결과 이 논문에서 제안한 새로운 그래프 매칭을 이용한 영상 검색 시스템은 기존의 스펙트럴 매칭을 이용한 검색 방법보다 우수한 성능을 보였다. An effective and accurate graph matching method is very important in content-based image retrieval systems using graph matching. In this paper, we propose an image retrieval system using a new graph matching algorithm based on Bayes theorem and Dirichlet distribution. To be more specific, each image is represented as a graph using nodes (detectors) and attributes of edges in the graph are assigned using the distance between two descriptors. Then, matching matrix is calculated to indicate the degree of matching between two node sets in different graphs using Bayes theorem and Dirichlet distribution. Last, the proposed algorithm searches for an optimal matching solution using convex relaxation algorithm from matching matrix. Here, we present an image as graph using MSER region detector which is robust to various transformations and calculate matching matrix using SIFT descriptor which is invariant against scale and rotation. Correlation between descriptors of two images is substituted for similarity between two images. Therefore, in retrieval phase, the system selects the images with high similarity by matching query image to each of all images in the database. We used COIL-20 database to test and evaluate the proposed system and compared our system with an image retrieval system using spectral matching method. The experimental results have shown that the proposed system based on a new graph matching algorithm achieves superior performance in comparison with spectral matching method.
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Aspartate 투여가 혈중젖산 및 알콜농도에 미치는 영향
박상철,김완조,김완수,김창근,이영하 韓國體育大學校附屬 體育科學硏究所 1993 韓國體育大學校附屬 體育科學硏究所論文集 Vol.12 No.1
The purpose of this study was to evaluate the possiblity of the modulation in blood lactate and alchohol concentration by suppling the reoxidized NAD in response to aspartate supplementation. Eight healthy men performed treadmill test ingested alcohol of 0.8ml/kg body weight(40 vol% ) for ten minutes at 80% of maximal heart rate. Two different amino acids of aspartate(ASP) and Aspartate-Glutamate(ASP-GLU) mixture were administrated, and the test was duplicated at one and three hour after amino acids and alcohol ingestion. Blood lactate concentration in placebo trial was significantly higher than in control trial which was performed without alcohol and amino acids ingestion, whereas slightly higher in amino acid trials, especially was true in ASP-GLU trial compare to control. Furthermore, blood alcohol concentration in amino acids trial, at both test after ingestion was significantly lower than in placebo trial, especially ASP-GLU ingestion was markedly to reduced alcohol level in blood. The same trend occured in the second test which was perfomed after three hour. Blood lactate level in control trial was similar to placebo trial, but it was lowed in amino acids ingestion trials. In conclusion, aspartate supplementation can be used as a effective tool to enforce in the intracellular NADH reoxidation without clear concominant changes in energy metabolism.
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가령 (Aging)에 따른 갑상선 특이항원 발현의 변화
박영주,박은신,김태용,김상완,박형규,박도준,김원배,신찬수,박경수,김성연,박상철,이홍규,조보연 대한내분비학회 2001 Endocrinology and metabolism Vol.16 No.4
Background: With the prevalence of serum antithyroglobulin (anti-TG) and antithyroperoxidase (anti- TPO) autoantibodies increasing with age, it has been suggested that changes of thyroid autoimmunity with aging are associated with endemic iodine intake. To understand the mechanism of aging-related increases of thyroid autoimmune response, we investigated the expression of thyroid specific autoantigens of aged phenotype, and compared them with those of young phenotype both in vivo and in vitro. Methods: Sprague-Dawley rats were sacrificed at 5, 10 and 16 weeks (young), and at 23 months (aged). Their FRTL-5 thyroid cells were harvested at cell passages less than 10 (fresh) or more than 30 (aged). The expression of thyroid autoantigens, sodium-iodide symporter (NIS), TSH receptor (TSHR), TG and TPO, were examined by northern blot analysis. To evaluate the effects of iodide, 1 mM of NaI was added to the medium for 24 hours, and following incubation the expressions of MHC class Ⅰ and class Ⅱ were also examined. Results: The expressions of TPO were markedly increased in the aged rats, and those of TG were moderately. However, NIS and TSHR showed no differences in their expression levels between aged rats and young rats. In vitro, there were no differences in the expressions of TG or TPO, nor of NIS or TSHR, between aged cells and fresh cells. Neither did Iodide exhibit any influence on the expression of MHC molecules in aged cells or fresh cells. Conclusion: The expression levels of TPO and TG were increased in aged rats, which may partially explain the mechanism of increasing thyroid autoimmunity with age
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