• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2001년도 학술발표회 논문집(I)
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• pp.182-187
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• 2001

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2005년도 학술발표회(2)
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• pp.1108-1109
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• 2005

• 컴퓨터교육학회논문지
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• 제6권4호
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• pp.37-47
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• 2003

본 논문에서는 영상의 소유권 보호를 위해 DCT계수들의 자기유사성(self-similarity)을 이용한 새로운 디지털 워터마킹 기법을 제시한다. 신경회로망 중 SOM(Self-Organizing Map)을 이용하여 유사한 계수를 분류하고 클러스터들 중 선택된 클러스터에 워터마크를 삽입한다. 일반적으로 영상의 고주파 영역에 삽입된 워터마크는 JPEG압축 같은 압축처리에 의해 쉽게 제거된다. 그리고 저주파 영역에 삽입된 워터마크는 영상의 화질을 훼손시킨다. 따라서 중간주파수 영역에서 많은 계수들을 가지는 클러스터에 워터마크를 삽입한다. 이 알고리즘은 선택된 클러스터 내의 계수들의 개수에 따라 워터마크를 영상에 삽입함으로써 영상의 훼손을 줄여준다. 워터마크가 삽입된 영상으로부터 워터마크를 검출하기위해 원영상없이 선택된 클러스터를 이용한다. 실험을 통해 새로 제안된 알고리즘은 영상의 좋은 화질과 JPEG 압축, 필터링과 같은 영상처리, 축소와 학대, 잘라내기 같은 기하학적 변환, 자음과 같은 공격에 아주 강인하다.

• Asian-Australasian Journal of Animal Sciences
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• 제31권1호
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• pp.19-25
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• 2018

Objective: In practical breeding, selection is often performed by ignoring the accuracy of evaluations and applying economic weights directly to the selection index coefficients of genetically standardized traits. The denominator of the standardized component trait of estimated genetic evaluations in practical selection varies with its reliability. Whereas theoretical methods for calculating the selection index coefficients of genetically standardized traits account for this variation, practical selection ignores reliability and assumes that it is equal to unity for each trait. The purpose of this study was to clarify the effects of ignoring the accuracy of the standardized component trait in selection criteria on selection responses and economic weights in retrospect. Methods: Theoretical methods were presented accounting for reliability of estimated genetic evaluations for the selection index composed of genetically standardized traits. Results: Selection responses and economic weights in retrospect resulting from practical selection were greater than those resulting from theoretical selection accounting for reliability when the accuracy of the estimated breeding value (EBV) or genomically enhanced breeding value (GEBV) was lower than those of the other traits in the index, but the opposite occurred when the accuracy of the EBV or GEBV was greater than those of the other traits. This trend was more conspicuous for traits with low economic weights than for those with high weights. Conclusion: Failure of the practical index to account for reliability yielded economic weights in retrospect that differed from those obtained with the theoretical index. Our results indicated that practical indices that ignore reliability delay genetic improvement. Therefore, selection practices need to account for reliability, especially when the reliabilities of the traits included in the index vary widely.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2002년도 학술발표회 논문집(I)
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• pp.389-393
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• 2002

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2003년도 학술발표회논문집(2)
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• pp.847-850
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• 2003

• 한국수자원학회논문집
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• 제48권2호
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• pp.127-136
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• 2015

일반적으로 XP-SWMM은 맨홀을 하나의 절점으로 간주하여 절점의 형상과 크기에 따른 국부손실의 영향을 고려하지 못하기 때문에 침수면적을 과소 산정한다. 그러므로 과부하 맨홀 내에서의 손실계수를 고려한 해석 방안 및 손실계수의 적용에 따른 침수해석에 관한 연구가 필요하다. 본 연구에서는 유량변화 및 맨홀 형상 변화에 따른 수리실험을 실시하여, 과부하 맨홀(원형, 사각형)에서의 손실계수를 각각 0.61과 0.68로 산정하였다. 또한 XP-SWMM을 이용하여 군자배수분구를 대상으로 산정된 손실계수의 적용 유무에 따른 침수면적의 변화특성을 분석하였다. 분석 결과 손실계수를 적용하면 침수면적이 3.5ha 증가하는 것으로 나타났다. 이는 손실계수 적용에 따라서 맨홀에서의 월류량이 증가하기 때문이다. 대상유역에 손실계수를 적용하였을 경우 실제 침수면적과의 일치율은 약 58%로 나타났으며, 손실계수를 고려하지 않았을 경우의 일치율은 약 40%로 나타났다. 그러므로 과부하 맨홀에서의 손실계수를 고려한 2차원 침수해석의 결과는 도시지역의 침수 위험지역을 정확하게 파악하기 위한 기초적인 자료로 활용이 가능할 것으로 판단된다.

• Asian-Australasian Journal of Animal Sciences
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• 제14권5호
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• pp.597-602
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• 2001

This study was conducted to examine the relationships between the methods used to determine the number of transferable embryos collected per flush and the estimated cumulative genetic improvements in the Japanese Holstein MOET breeding population. Cumulative genetic improvements were predicted by Monte Carlo simulation using three different determination methods (MODEL 1, MODEL 2, and MODEL 3), for calculating the number of embryos collected per flush. Moreover EBVs were estimated including or ignoring coefficients of inbreeding in MME. Inbreeding coefficients were also predicted. The number of transferable embryos was determined using normal, gamma, and Poisson distributions in MODEL 1, gamma and Poisson distributions in MODEL 2, and only the Poisson distribution in MODEL 3. The fitness of MODEL 2 in relation to field data from Hokkaido Japan was the best, and the results for MODEL3 indicated that this model is unsuitable for determining the number of transferable embryos. The largest cumulative genetic improvement (3.11) in the 10th generation was predicted by MODEL 3 and the smallest (2.83) by MODEL 2. Mean coefficients of correlation between the true and estimated breeding values were 0.738, 0.729, and 0.773 in MODELS 1, 2, and 3, respectively. It is suggested that the smallest genetic improvement in MODEL 2 resulted from the smallest correlation coefficient between the true and estimated breeding values. The differences in milk, fat, and protein yields between MODELS 2 and 3 were 182.0, 7.0, and 5.6 kg, respectively, in real units when each trait was independently selected. The inbreeding coefficient was the highest (0.374) in MODEL 2 and the lowest (0.357) in MODEL 3. The effects of different methods for determining the number of transferable embryos per flush on genetic improvements and inbreeding coefficients of the simulated populations were remarkable. The effects of including coefficients of inbreeding in MME, however, were unclear.

• Journal of Radiation Protection and Research
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• 제41권4호
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• pp.424-435
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• 2016

Background: The International Commission on Radiological Protection (ICRP) recommendations and the Federal Guidance Report (FGR) published by the U.S. Environmental Protection Agency (EPA) have been widely applied worldwide in the fields of radiation protection and dose assessment. The dose conversion coefficients of the ICRP and FGR are widely used for assessing exposure doses. However, before the coefficients are used, the user must thoroughly understand the derivation process of the coefficients to ensure that they are used appropriately in the evaluation. Materials and Methods: The ICRP provides recommendations to regulatory and advisory agencies, mainly in the form of guidance on the fundamental principles on which appropriate radiological protection can be based. The FGR provides federal and state agencies with technical information to assist their implementation of radiation protection programs for the U.S. population. The system of radiation dose assessment and dose conversion coefficients in the ICRP and FGR is reviewed in this study. Results and Discussion: A thorough understanding of their background is essential for the proper use of dose conversion coefficients. The FGR dose assessment system was strongly influenced by the ICRP and the U.S. National Council on Radiation Protection and Measurements (NCRP), and is hence consistent with those recommendations. Moreover, the ICRP and FGR both used the scientific data reported by Biological Effects of Ionizing Radiation (BEIR) and United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR) as their primary source of information. The difference between the ICRP and FGR lies in the fact that the ICRP utilized information regarding a population of diverse races, whereas the FGR utilized data on the American population, as its goal was to provide guidelines for radiological protection in the US. Conclusion: The contents of this study are expected to be utilized as basic research material in the areas of radiation protection and dose assessment.

• Journal of Radiation Protection and Research
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• 제16권2호
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• pp.55-65
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• 1991

벼, 콩, 상치, 당근, 호박의 가식부위에 대하여 몇 가지 토양에 있어서 토양-작물체간 Mn-54, Co-60, Zn-65, Cs-137의 전이계수를 포트 재배에 의한 방사성 추적자 흡수실험을 통하여 조사하였다. 핵종간 전이계수는 거의 모든 경우 Zn-65>Mn-54>Cs-137>Co-60의 순이었다 중이 벼보다 전반적으로 한 자리 정도 높은 값을 보였고 채소류의 경우에는 대체로 상치에서 가장 높고 호박에서 가장 낮은 값을 보였다. 강산성 토양에서는 약산성 토양에서보다 전이계수가 철센 높았다. 본 조사결과에 입각하여 한국인의 섭식경로 피폭선량 평가에 이용하기 위한 각 핵종의 전이계수치가 작물별로 제안되었다.