• 방사성폐기물학회지
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• 제13권2호
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• pp.113-122
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• 2015

원자로의 해체 과정에서 발생되는 방사성 폐기물 내 존재하는 ⁵⁵Fe, ⁶³Ni은 폐기물의 처리방법을 결정하는 데 있어 기초적인 지표로 활용되는 중요한 핵종이다. 하지만 두 핵종은 낮은 방사선량으로 인해 다른 핵종들과의 분리가 필수적이며 또한 시료 매질에서 완전히 추출할 수 있는 전처리가 선행되어야 한다. 따라서 본 연구는 다양한 매질의 원자로 해체 폐기물에 대한 전처리방법의 적용성을 평가하기 위해 NIST SRM 5종 (1646a, 1944, 8704, 2709a, 1633c)에 대하여 왕수, 불산, 과염소산을 각각 이용하는 습식산화법과 alkali-fusion 전처리법에 따른 Iron와 Nickel의 회수율을 비교하였다. 실험 결과 alkali-fusion 방법은 다양한 매질의 인증표준물질에 대해 Iron 95.3∼98.3%, Nickle 86.6∼88.1%의 분석 정확도와 2% 이하의 정밀도를 나타냄으로서 해체폐기물 중 ⁵⁵Fe, ⁶³Ni, 분석에 가장 최적화된 전처리법으로 판단된다.

• 한국지반공학회논문집
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• 제27권12호
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• pp.5-15
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• 2011

본 연구는 매립지의 최종복토층으로 사용되는 점토 혹은 지오멤브레인의 부등침하 및 기상조건변화에 의한 균열에 취약한 점을 고려하여 균열 발생시 자가형성된 물질로 인하여 균열치유 작용을 할 수 있는 SRSL(Self Recovering Sustainable Liner)의 매립지 최종복토층으로서의 적용성을 파악하였다. SRSL 기법은 2개의 층을 두어 상, 하부층 사이 계면에 불투수성 물질을 생성하는 동시에, 균열발생 시에도 2가지 성분이 다시 결합하여 불투수성 물질을 재형성하는 역할을 수행한다. SRSL의 최종복토층의로서의 적용성 파악을 위해서 실험실에서 연성벽체 투수시험기를 사용하여 투수 특성을 파악하였고 일축압축시험을 통하여 강도 및 강성 특성을 파악하였다. 또한 최종 복토층의 경우 환경적인 요인에 직접적으로 노출되어 있기 때문에 동결/융해 및 건조/습윤에 따른 SRSL의 투수 및 강도 특성 또한 알아보았다. 시험 결과, SRSL은 낮은 투수계수와 기준보다 높은 강도를 가진 매립장의 복토층 재료로 적합한 물질로 판단되며, 동결/융해 및 건조/습윤의 환경적인 영향에 대해서도 안정한 것으로 판명되었다.

• 자원환경지질
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• 제41권5호
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• pp.509-516
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• 2008

지역단위 수요를 분석할 수 있는 자료상의 요건은 수요량에 관한 것이다. 분석하고자 하는 지역의 수요량을 파악해야 수요를 분석할 수 있는데, 현실적으로 모든 수요량을 파악한다는 것은 곤란하다. 이러한 이유로 대부분의 지역단위 수요량 조사는 광석수요량, 금속괴 수요량 등 특정 단계의 거래량을 이용하게 된다. 그러나 이는 수입된 최종제품의 부분품으로서 금속자원 수요량이나 다른 단계의 제품으로 수입된 수요량은 고려하지 않은 해당 금속자원의 수요량 중 일부분에 해당되는 것이다. 이와 같은 자료상의 한계를 인식하여, 본 연구는 국내 금속괴의 수요를 분석함에 있어 개념적으로 이분하여 국내사용을 목적으로 하는 수요와 국외사용을 목적으로 하는 수요로 구분하였다. 국내사용을 목적으로 하는 수요는 국내의 경제, 기술 등 요인에 따라, 그리고 국외사용을 목적으로 하는 수요는 국외 소득변화가 우리 경제에 영향을 주는 정도에 따라 변화하는 양상을 보일 것이다. 이를 근거로 사용강도(intensity of use)의 가설을 도입하여 국내 동괴, 연괴, 아연괴의 수요를 모형화하고 실증분석하였으며 유의한 결과를 도출했다.

• Journal of Plant Biotechnology
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• 제4권3호
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• pp.95-101
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• 2002

Molecular faming has the potential to provide large amounts of recombinant protein for use in diagnostics and as therapeutics. Various strategies have been developed to enhance the expression level, stability, and native folding of recombinant proteins produced in plants. Few investigations into the subcellular distribution of recombinant proteins within plant cells have been published despite the potential to increase the expression level and impact the purification process. This review article discusses the current strategies used for targeting recombinant proteins to various subcellular locations and the advantages of targeting to seed oil bodies for molecular farming applications. Specifically, the affinity capture of antibodies using recombinant oilbodies is discussed.

• 한국측량학회:학술대회논문집
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• 한국측량학회 2007년도 춘계학술발표회 논문집
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• pp.169-173
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• 2007

Nowadays the aerial photos is using to get the information around our spatial environment and it increases by geometric progression in many fields. The aerial photos need in a simple object such as cartography and ground covey classification and also in a social objects such as the city plan, environment, disaster, transportation etc. However, the shadow, which includes when taking the aerial photos, makes a trouble to interpret the ground information, and also users, who need the photos in their field tasks, have restriction. This study, for removing the shadow, uses the single image and the image without the source of image and taking situation. Also, this study present clustering algorism based on HIS color model that use Hue, Saturation and Intensity, especially this study used I(intensity) to extract shadow area from image. And finally by filtering in Fourier frequency domain creates the intrinsic image which recovers the 3-D color information and removes the shadow.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 제13회 신호처리 합동 학술대회 논문집
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• pp.671-674
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• 2000

In this paper, we present a robust global registration algorithm for multi-frame image mosaics. When we perform a pair-wise registration recovering a projective transformation between two consecutive frames, severe mis-registration among multiple frames, which are not consecutive, can be detected. It is because the concatenation of those pair-wise transformations leads to global alignment errors. To overcome those mis-registrations, we propose a new algorithm using multiple frames for constructing image mosaics. We use a graph to represent the temporal and spatial connectivity and show that global registration can be obtained through the search for an optimal path in the constructed graph. The definition of an adequate objective function characterizing the global registration provides a direct manipulation of the graph. In the presence of moving objects, especially large ones compared with low texture backgrounds, by using the likelihood ratio as the objective function, we can deal with some of the most challenging videos like basketball or soccer Moreover, the algorithm can be parallelized so it can be more efficiently implemented. Finally, we give some experimental results from real videos.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 ITC-CSCC -2
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• pp.1145-1148
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• 2002

This paper presents a new method which is calculated to use only three vanishing points in order to compute the dimensions of object and its pose from a single image of perspective projection taken by a camera and the problem of recovering 3D models from three vanishing points of box scene. Our approach is to compute only three vanishing points without this information such as the focal length, rotation matrix, and translation from images in the case of perspective projection. We assume that the object can be modeled as a linear function of a dimension vector ν. The input of reconstruction is a set of correspondences between features in the model and features in the image. To minimize each the dimensions of the parameterized models, this reconstruction of optimization can be solved by the standard nonlinear optimization techniques with a multi-start method which generates multiple starting points for the optimizer by sampling the parameter space uniformly.

• 한국국방경영분석학회지
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• 제28권1호
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• pp.97-114
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• 2002

An estimation of economic life for a new weapon system is a critical issue in aquisition process. In general a life cycle cost consists of, development cost, aquisition cost, and maintenance cost. These costs are not identified and obtained in the beginning of the aquisition process. This paper deals with an economic life for KlAl tank which is being deployed recently, using PRICE model. In order to estimate an KlAl economic life, we use equivalent annual cost method which is sum of capital recovering with return and equivalent O&M cost method. This method determines an economic life by minimizing annual investment cost and operation and maintenance cost. In this paper, an aquisition cost of KlAl is obtained from PRICE H and O&M cost from PRICE HL model. We obtained various results depending upon production quantity. An economic life for KlAl is estimated 18 years when 300 tanks are produced.

• 융합신호처리학회 학술대회논문집
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• 한국신호처리시스템학회 2000년도 추계종합학술대회논문집
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• pp.81-84
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• 2000

Digital Halftoning convert a continuous-tone images to a binary images. Inverse halftoning addresses the problem of recovering a continuous image from a halftoned binary image. Simple low pass filtering can remove the high frequency noise but it also removes the edge information. Thus the edge information should be separated from the halftoning noise. As a result, the edge of result image is blurring. This paper present that we obtain continuous-tone-image which using Anisotropic diffusion filter. To reduce noise without blurring the edges of reconstructed image use edge map. The experimental results show that proposed method gives a higher PSNR and better subjective quality than conventional methods. As a result, the edge information of reconstructed image reduce blurring.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제14권11호
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• pp.4355-4371
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• 2020

Phase retrieval, recovering a signal from phaseless measurements, is generally considered to be an NP-hard problem. This paper adopts an amplitude-based nonconvex optimization cost function to develop a new stochastic gradient algorithm, named stochastic reweighted phase retrieval (SRPR). SRPR is a stochastic gradient iteration algorithm, which runs in two stages: First, we use a truncated sample stochastic variance reduction algorithm to initialize the objective function. The second stage is the gradient refinement stage, which uses continuous updating of the amplitude-based stochastic weighted gradient algorithm to improve the initial estimate. Because of the stochastic method, each iteration of the two stages of SRPR involves only one equation. Therefore, SRPR is simple, scalable, and fast. Compared with the state-of-the-art phase retrieval algorithm, simulation results show that SRPR has a faster convergence speed and fewer magnitude-only measurements required to reconstruct the signal, under the real- or complex- cases.