• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 2015년도 추계학술대회
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• pp.180-181
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• 2015

In this paper, we present a consistent and efficient edit propagation method that is applied for light field data. Unlike conventional sparse edit propagation, the coherency between light field sub-aperture images is fully considered by utilizing light field consistency in the optimization framework. Instead of directly solving the optimization function on all light field sub-aperture images, the proposed optimization framework performs sparse edit propagation in the extended focus image domain. The extended focus image is the representative image that contains implicit depth information and the well-focused region of all sub-aperture images. The edit results in the extended focus image are then propagated back to each light field sub-aperture image. Experimental results on test images captured by a Lytro off-the-shelf light field camera confirm that the proposed method provides robust and consistent results of edited light field sub-aperture images.

• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2004년도 추계학술대회
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• pp.229-235
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• 2004

This paper treats accelerated life tests for automotive connector. The contact resistance of connector is explained by some factors; the use time(calender time, real cycle), stresses and loads adapted in auto test. The relationships between contact resistance and some factors are compared and analyzed by regression models in various test conditions; field use-environment, manufacturer's test environment, and accelerated test condition. The consistency between of manufacturer's test and field test is examined. Finally, the future study on accelerated test for automotive connector is presented.

• 국제지역연구
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• 제22권4호
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• pp.209-227
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• 2018

전 세계 각국의 긴급하고 증진된 행동을 요구하는 기후변화 문제는 국제사회의 공조가 필요하며 다양한 정책들 간에 일관성이 특히 중요하다. 본 연구는 기후변화 문제에 대응하기 위한 국내 정책과 원조 정책 사이에 일관성이 존재하는지를 살펴보기 위하여 기후변화 분야에 대한 지속가능발전목표(SDGs)의 국내 이행 성과와 원조 규모 간의 관계를 분석한다. 이는 기후변화라는 범분야 이슈에 대한 국내 정책과 원조 정책 간의 일관성을 가늠할 수 있는 방법론의 시작점이 될 수 있다. OECD 국가들의 기후변화 분야 SDG 국내 이행과 관련된 지수들과 ODA 실적 간의 상관관계 분석을 실시한 결과, 이산화탄소 배출 유입량과 기후변화 ODA 비중 사이에 상당 수준의 음(-)의 상관관계가 있는 반면, 화석연료 수출품에 내재된 이산화탄소 배출량과 기후변화 ODA 비중은 상당 수준의 양(+)의 상관관계를 보인다. 기후변화 분야에 있어서 OECD 국가들의 국내 정책과 원조 정책 간에 일관성이 충분히 보장되지 않고 있으며, 범분야 이슈인 기후변화가 국가 정책 전반에 있어서 일관된 방향으로 추진되지 않고 있다. 각국이 국내 정책 설계와 이행 과정에서 기후변화 이슈를 통합할 수 있는 강력한 방안이 요구된다.

• 한국신뢰성학회:학술대회논문집
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• 한국신뢰성학회 2011년도 춘계학술발표대회 논문집
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• pp.21-26
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• 2011

Initial reliability prediction done by calculation would be more practical if support by evidence from customer usage profile and field failure data to improve the prediction. Thus, the consistency of the design and the product would be practically validated. In this paper, it will address rationale and method to decide on Acceleration Factor (AF) to be used in Accelerated Life Test (ALT) through usage profile and field failure. The case study of tractor transmission is used to demonstrate the method which data obtained from surveys done on farmers, field visits and field failure data from service center. By considering all the elements, it will determine more relevant AF which indicates the real use conditions of the component.

• Journal of the Korean Society for Industrial and Applied Mathematics
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• 제18권4호
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• pp.305-316
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• 2014

The Hodge-Helmholtz decomposition splits a vector field into the unique sum of a divergence-free vector field (solenoidal part) and a gradient field (irrotational part). In a bounded domain, a boundary condition needs to be supplied to the decomposition. The decomposition with the non-penetration boundary condition is equivalent to solving the Poisson equation with the Neumann boundary condition. The Gibou-Min method is an application of the Poisson solver by Purvis and Burkhalter to the decomposition. Using the $L^2$-orthogonality between the error vector and the consistency, the convergence for approximating the divergence-free vector field was recently proved to be $O(h^{1.5})$ with step size h. In this work, we analyze the convergence of the irrotattional in the decomposition. To the end, we introduce a discrete version of the Poincare inequality, which leads to a proof of the O(h) convergence for the scalar variable of the gradient field in a domain with general intersection property.

• 한국콘텐츠학회논문지
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• 제4권3호
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• pp.71-80
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• 2004

분산파일시스템 환경에서는 디스크 접근 비용을 줄이기 위해 각 노드에 캐시된 데이터를 서로 공유하는 협력캐시 알고리즘이 사용된다. 협력캐시 알고리즘은 분산되어있는 시스템들의 캐시정보를 서로 공유하여 가상으로 더 큰 캐시를 형성함으로써 캐시 히트율을 높이고 디스크 접근을 줄이는 방법이다. 기존에 제안된 협력캐시 알고리즘들은 캐시에 대한 근사정보를 이용하여 메시지 비용을 줄이고, 로컬캐시영역과 글로벌캐시 영역을 가변적으로 사용하여 캐시 히트율을 높이고 있다. 또한 버퍼 교체 시 교체된 버퍼를 비활동적인 노드로 보내어 계속 캐시에 유지하도록 하여 전역 버퍼 히트율을 높이는 장점을 갖는다. 그러나 잘못된 근사정보가 성능을 저하시킬 수 있으며 일관성 유지를 위한 메시지교환 비용이 많이 든다는 단점을 갖고 있다. 또한 비활동적인 노드를 선정하기 위해 사용되는 각 노드의 에이지 정보 관리비용이 많이 드는 단점을 갖고 있다. 본 논문에서는 정확한 캐시정보를 유지하며 일관성 유지비용과 버퍼 에이지 정보 관리비용을 최소화시키는 협력캐시 알고리즘을 제안한다. 그리고 성능평가를 통해 기존의 협력캐시 알고리즘과 비교하여 제안하는 알고리즘의 우수성을 보인다.

• 한국인터넷방송통신학회논문지
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• 제12권6호
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• pp.147-153
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• 2012

IT 환경이 점점 복잡해지고 인프라의 규모가 커지면서 정보시스템의 안전성과 데이터의 가용성에 대한 인식이 더욱 가중되고 있다. 이처럼 정보자산의 가치가 중요시되는 시점에서 재해복구 대응책을 위한 고성능 백업시스템에 대한 연구는 비즈니스에 직접적인 영향을 미치는 분야이다. 그러므로 본 연구는 고성능 백업시스템을 위한 복제 데이터의 정합성검증을 시행하였다. 그리고 DB 테이블 복제 처리 성능 비교와 네트워크 대역폭에 따른 복제 시스템의 트랜잭션 처리 속도와 성능 평가를 시행하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권7호
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• pp.3239-3267
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• 2018

Image and video dehazing is a popular topic in the field of computer vision and digital image processing. A fast, optimized dehazing algorithm was recently proposed that enhances contrast and reduces flickering artifacts in a dehazed video sequence by minimizing a cost function that makes transmission values spatially and temporally coherent. However, its fixed-size block partitioning leads to block effects. The temporal cost function also suffers from the temporal non-coherence of newly appearing objects in a scene. Further, the weak edges in a hazy image are not addressed. Hence, a video dehazing algorithm based on well designed spectral clustering is proposed. To avoid block artifacts, the spectral clustering is customized to segment static scenes to ensure the same target has the same transmission value. Assuming that edge images dehazed with optimized transmission values have richer detail than before restoration, an edge intensity function is added to the spatial consistency cost model. Atmospheric light is estimated using a modified quadtree search. Different temporal transmission models are established for newly appearing objects, static backgrounds, and moving objects. The experimental results demonstrate that the new method provides higher dehazing quality and lower time complexity than the previous technique.

• 국제학술발표논문집
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• The 2th International Conference on Construction Engineering and Project Management
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• pp.269-278
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• 2007

Nighttime construction is being adopted by many state DOT's as a way to mitigate the impact of construction operations on the traveling public. Although a number of states have developed standard specifications for nighttime lighting, these standards are usually in the form of generic requirement statements that only specify minimum illuminance levels. The lighting standards do not include specific ways to achieve this illuminance level such as lighting arrangements and configurations for various work zone plans and construction operations. This leaves confusion between the traffic engineers and the contractors and does not guarantee consistency in those plans, thus affecting productivity and safety (lighting conditions account for 18% to 28% of work zone accidents). The main objective of this study is to utilize three dimensional animation and lighting analysis software to study and model lighting conditions of a construction site. This is expected to increase the safety and productivity of construction operations by achieving consistency in work zone lighting schemes. A computerized model was developed, called Nitelite. Various lighting schemes can be studied using the software to provide for typical applications including lighting fixture's locations, luminance, mounting height, tilt angle, and fixture type. The results from the developed software tool were validated through comparisons with previous research conducted using field measurements.

• 디지털산업정보학회논문지
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• 제4권1호
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• pp.105-117
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• 2008

T Abstract This study investigates the influence of differential factors on learner satisfaction by field-independent learning style in e-learning. Most of data were collected from students. Participants were classified based on a learning style typology (field-independent/dependent) and, then, analyzed was the influence of key factors on learner satisfaction using multiple regression analysis. This study suggests that e-Learning service providers need to differentiate learners based on learning style in order to improve learner satisfaction. Specially, Field independent learners are more likely to be satisfied by the teacher's provide degree of joyful, degree of contents, degree of learning control pacing, ability of problem solving and consistency.