• 한국정보통신학회논문지
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• 제20권1호
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• pp.58-64
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• 2016

본 논문에서는 블러와 조명 변화에 강인한 바코드 디코딩 방법을 제안한다. 제안하는 디코딩 방법은 블러에 강인 디코딩과 빠른 연산속도를 위해 블러 영역과 비블러영역을 나누어 임계값을 연산하는 부분 지역 임계값 이진화 방법을 사용하였다. 또한 노이즈 데이터에 의한 인식 실패를 막기 위해서 동일한 엘리먼트 개수를 가지는 라인의 픽셀 너비를 모두 합한 면적 데이터를 이용하여 군집분류를 수행하는 k-means 알고리즘 기반의 디코더를 구현하였다. 다양한 악조건 환경에서 촬영된 샘플을 이용하여 실험 결과, 평균 98.47%로 높은 성공률을 보였으며 3개의 비교 프로그램 보다 성공률이 높았다.

• 대한전자공학회논문지SP
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• 제48권1호
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• pp.46-53
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• 2011

비지역적 평균 기반 영상 잡음 제거 알고리즘은 이론적 배경이 간단한데 반해 영상 잡음 제거 성능은 우수하여 최근 가장 널리 사용되는 잡음제거 알고리즘 중에 하나이다. 그러나 기존의 비지역작 평균 기반 알고리즘도 여전히 평탄 영역에서의 잡음 제거 효과가 미흡하며 잡음 제거 과정에서 경계 및 패턴 영역의 흐려짐과 같은 문제점이 있어 다양한 방식으로 개선된 알고리즘이 개발되고 있다. 본 논문에서는 비지역적 평균값을 구할 때 사용되는 가중치를 가중치 정렬을 통해 재 정의된 임계치로서 갱신하고 그로부터 잡음 제거 효과를 향상시키는 개선된 비지역적 평균 알고리즘을 제안한다. 가중치 정렬을 통해 갱신된 가중치들을 통해 경계 및 패턴 영역에서 보다 고르고 선명하게 가중치를 구할 수 있어 결과적으로 잡음 제거로 인한 흐려짐 없이 잡음 제거가 가능하다. 다양한 잡음 정도를 갖는 실험 영상에 제안된 방법을 테스트하여 기존에 제안된 비지역적 평균 기반 알고리즘들에 비해 시각적, 수치적 성능에서 우수한 결과를 얻을 수 있었다.

• 한국연소학회지
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• 제12권2호
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• pp.26-33
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• 2007

To reveal the newly found liftoff height behavior of hydrogen jet, we have experimentally studied the stabilization mechanism of turbulent, lifted jet flames in a non-premixed condition. The objectives of the present research are to report the phenomenon of a liftoff height decreasing as increasing fuel velocity, to analyse the flame structure and behavior of the lifted jet, and to explain the mechanisms of flame stability in hydrogen turbulent non-premixed jet flames. The velocity of hydrogen was varied from 100 to 300m/s and a coaxial air velocity was fixed at 16m/s with a coflow air less than 0.1m/s. For the simultaneous measurement of velocity field and reaction zone, PIV and OH PLIF technique was used with two Nd:Yag lasers and CCD cameras. As results, it has been found that the stabilization of lifted hydrogen diffusion flames is related with a turbulent intensity, which means that combustion occurs at the point where the local flow velocity is balanced with the turbulent flame propagation velocity.

• 한국수자원학회논문집
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• 제48권6호
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• pp.451-461
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• 2015

본 연구에서는 태풍의 경로 및 규모를 이용한 호우분리기법을 통해 한반도에 유발된 강우를 집중호우와 태풍강우로 분류하고, 지역별 강우특성 및 경향성 분석을 수행하였다. 또한 호우분리를 통한 비정상성 빈도해석을 수행하여 미래확률강우량을 산정하였으며, 이에 대한 정량적인 비교 및 평가를 수행하였다. 분석결과, 전기간 자료, 태풍강우 및 집중호우의 증가 및 감소율이 각각 상이하며, 증가 및 감소경향이 서로 상반되는 지점도 나타났다. 또한 호우분리를 통한 비정상성 빈도해석을 수행한 결과, 비교적 합리적인 미래확률강우량이 산정됨을 확인할 수 있었으며, 전기간 자료를 이용한 미래확률강우량과 비교한 결과 한반도 남부 및 동부지역에서 상대적으로 큰 차이가 나타났다. 호우분리기법을 적용한 비정상성 빈도해석 결과는 태풍 및 집중호우의 지역적인 변화특성을 잘 반영하는 것으로 나타나 수공구조물 설계 및 미래 기후변화와 관련된 치수대책 및 정책수립에 활용도가 높을 것으로 판단된다.

• 한국지구과학회지
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• 제26권5호
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• pp.429-435
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• 2005

물리탐사와 시추자료에 대해 지구통계학적 복합해석 기술을 적용하여 3차원의 암반등급 해석을 수행하였다. 자료 복합 해석을 위한 다양한 지구통계학적 기술 중에서, 본 연구에서는 물리탐사 자료의 값을 추정하고자 하는 지점의 암반등급의 평균치로 치환하는 국소 변이 평균에 의한 단순 크리깅 기술(Simple Kriging with local varying means)을 사용하였다. 암석의 전기비저항 값은 RMR(Rock Mass Rating)값과 양의 상관관계를 갖는 것으로 알려져 있으나 상관 관계 만에 의한 대응방식은 그 양상이 매우 복잡하고 공간적으로 연관되어 있는 경우가 많아 단순히 적용하기 어려운 경우가 많다. 본 연구에서는 전기비저항과 RMR의 일반적 선형 상관관계 외에 지시자 변환(indicator transform)에 의한 비선형 상관관계를 유도하는 방식을 제안하였다. 또한 본 연구에서는 선형 및 비선형 상관관계에 의해 대응된 비저항 값이 실제 RMR과 비교할 때 나타나는 잔차(residual)에 대해 3차원 지구통계학적 분석을 적용하여 이 결과를 상관관계 결과에 추가함으로써 공간적 특성을 반영하는 RMR 평가를 수행할 수 있었다. 사용된 물리탐사 자료는 전기비저항 및 MT(Magnetotelluric) 탐사 자료이며, 총 10공의 시추자료를 통해 획득한 암반등급 값을 이용하였다. 이와 같은 해석은 조사 대상에 대한 광역적 지질조건을 보다 현실적으로 반영하는 암반등급 분포를 만들어내는 것으로 보인다.

• International Journal of Computer Science & Network Security
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• 제21권12spc호
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• pp.556-564
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• 2021

Numerous spatial and transform-domain-based conventional denoising algorithms struggle to keep critical and minute structural features of the image, especially at high noise levels. Although neural network approaches are effective, they are not always reliable since they demand a large quantity of training data, are computationally complicated, and take a long time to construct the model. A new framework of enhanced hybrid filtering is developed for denoising color images tainted by additive white Gaussian Noise with the goal of reducing algorithmic complexity and improving performance. In the first stage of the proposed approach, the noisy image is refined using a high-dimensional non-local means filter based on Principal Component Analysis, followed by the extraction of the method noise. The wavelet transform and SURE Shrink techniques are used to further culture this method noise. The final denoised image is created by combining the results of these two steps. Experiments were carried out on a set of standard color images corrupted by Gaussian noise with multiple standard deviations. Comparative analysis of empirical outcome indicates that the proposed method outperforms leading-edge denoising strategies in terms of consistency and performance while maintaining the visual quality. This algorithm ensures homogeneous noise reduction, which is almost independent of noise variations. The power of both the spatial and transform domains is harnessed in this multi realm consolidation technique. Rather than processing individual colors, it works directly on the multispectral image. Uses minimal resources and produces superior quality output in the optimal execution time.

• Current Optics and Photonics
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• 제8권2호
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• pp.127-137
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• 2024

The distribution of tags is an important factor that affects the performance of radio-frequency identification (RFID). To study RFID performance, it is necessary to obtain RFID tags' coordinates. However, the positioning method of RFID technology has large errors, and is easily affected by the environment. Therefore, a new method using optical measurement is proposed to achieve RFID performance analysis. First, due to the possibility of blurring during image acquisition, the paper derives a new image prior to removing blurring. A nonlocal means-based method for image deconvolution is proposed. Experimental results show that the PSNR and SSIM indicators of our algorithm are better than those of a learning deep convolutional neural network and fast total variation. Second, an RFID dynamic testing system based on photoelectric sensing technology is designed. The reading distance of RFID and the three-dimensional coordinates of the tags are obtained. Finally, deep learning is used to model the RFID reading distance and tag distribution. The error is 3.02%, which is better than other algorithms such as a particle-swarm optimization back-propagation neural network, an extreme learning machine, and a deep neural network. The paper proposes the use of optical methods to measure and collect RFID data, and to analyze and predict RFID performance. This provides a new method for testing RFID performance.

• 한국환경과학회지
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• 제13권2호
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• pp.117-127
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• 2004

The purpose of this study is to present the conditions and methods for keeping the sustainability of the landscape resources of the East Coast of Gangwon province, the Republic of Korea by investigating the landscape resources management in the area and pointing out its problems. The unit of analysis in this study is four cities and two counties located along the national road route seven in Gangwon province. The classification and characteristics of the landscape resources in this area was analyzed by a literature review, and we surveyed the tourists visiting the area and statistically analyzed the data in order to examine their satisfaction with the landscape resources management and make recommendations. The problems of the landscape resources management are: 1) the disturbance of the persistence of life by reclamation, the population reduction in the ecosystem due to the overload in environmental capacity, and the severance of space between land and water. 2) the reduction of the benefits from indirect experience by interfering with the conservation of fluxes --- the manipulation of horizontal arrangement of the landscape resource, the visual disturbance by the construction of high-storied buildings, and the disharmony between the color/image and the environment. The means for keeping sustainability of the landscape resources include the regulations of development and use, the change in the recognition of the value of landscape resources and the moral system, and the improvement of resource management skills.

• 한국환경과학회:학술대회논문집
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• 한국환경과학회 2003년도 International Symposium on Clean Environment
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• pp.192-197
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• 2003

The purpose of this study is to present the conditions and methods for keeping the sustainability of the landscape resources of the East Coast of Gangwon province, the republic of Korea by investigating the landscape resources management in the area and pointing out its problems. The problems of the landscape resources management are： 1) the disturbance of the persistence of life by reclamation, the population reduction in the ecosystem due to the overload in environmental capacity, and the severance of space between land and water. 2) the reduction of the benefits from indirect experience by interfering with the conservation of fluxes -- the manipulation of horizontal arrangement of the landscape resource, the visual disturbance by the construction of high-storied buildings, and the disharmony between the color/image and the environment. The means for keeping sustainability of the landscape resources include the regulations of development and use, the change in the recognition of the value of landscape resources and the moral system, and the improvement of resource management skills.

• 한국환경교육학회지:환경교육
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• 제17권2호
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• pp.79-93
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• 2004

The aim of this study is to provide a guide for the development of non-formal environmental educator certification system by analyzing certification systems in the United States, United Kingdom, and Japan. The following observations from reviewing environmental educator certification systems in the United States, United Kingdom, and Japan have implications for development of our own system in Korea. First, environmental educator certification systems are generally managed by cooperation of local environmental education organization association and local universities. Second, in many programs, applicants are qualified through processes including taking required curriculum and submitting portfolio or documents for reviewing of qualification. Third, in the United States, the majority of programs adopted curriculum based on ‘Guidelines for the Initial Preparation of Environmental Educator’ by NAAEE, which means the majority of programs have relatively standardized curriculum. Fourth, curriculums consist of basic skills of teaching, communication, leadership as well as contents of environmental education so that the applicants can practice more efficient environmental education when they are certified. Fifth, the certification programs utilize selected organizations' environmental education programs for training of applicants rather than establish their own programs. It contributes to the improvement of programs of organizations that applicants participated.