• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 합동 추계학술대회 논문집 정보 및 제어부문
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• pp.495-500
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• 2002

Recently, a service robot industry outstands as an up and coming industry of the next generation. Specially, there are so many research in self-steering movement(SSM). In order to implement SSM, robot must effectively recognize all around, detect objects and make a surrounding map with sensors. So, many robots have a sonar and a infrared sensor, etc. But, in these sensors, We only know informations about between the robot and the object as well as resolution faculty is of inferior quality. In this paper, we will introduce new algorithm that recognizes objects around robot and makes a two dimension surrounding map with a omni-direction vision camera and two stereo vision cameras.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2006년도 추계학술대회 논문집
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• pp.414-419
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• 2006

The ballast or other objects may be located on the rail road by a lump of ice, repairing operation on the track, or the strong gust due to the high speed running of the train. When a train operated in this condition, it causes serious damages to the wheel, train, and structures near the track, or the secondary ballast flying. To remove these objects safely, a ballast blower is suggested which was attached under the train. Firstly, the numerical analyses are investigated to find out the basic flow characteristics of the ballast blower. Next, the performance of the ballast blower is verified by wind tunnel experiments. Through these studies, it is expected that the ballast blower can be applied practically.

• 한국멀티미디어학회논문지
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• 제20권1호
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• pp.10-16
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• 2017

This paper proposes efficient schemes for image segmentation using the region-based active contour model. The developed methods can approach the boundaries of the desired objects by evolving the curves through minimization of the Mumford-Shah energy functionals, given arbitrary curves as initial conditions. Topological changes such as splitting or merging of curves should be handled for the methods to work properly without prior knowledge of the number of objects to be segmented. This paper introduces how to change topological structure of the curves and shows experimental results by applying the methods to the images.

• 한국멀티미디어학회논문지
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• 제22권1호
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• pp.18-26
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• 2019

In this paper we propose how to detect circular objects in the gray scale image and segment them using the discrete Morse theory, which makes it possible to analyze the topology of a digital image, when it is transformed into the data structure of some combinatorial complex. It is possible to get meaningful information about how many connected components and topologically circular shapes are in the image by computing the persistent homology of the filtration using the Morse complex. We obtain a Morse complex by modeling an image as a cubical cellular complex. Each cell in the Morse complex is the critical point at which the topological structure changes in the filtration consisting of the level sets of the image. In this paper, we implement the proposed algorithm of segmenting the circularly shaped objects with a long persistence of homology as well as computing persistent homology along the filtration of the input image and displaying in the form of a persistence diagram.

• 한국정보과학회논문지:데이타베이스
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• 제30권2호
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• pp.184-196
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• 2003

공간 객체를 수정하는 모바일 트랜잭션은 단절 상태에서 지역 데이타를 독립적으로 수정할 수 있는 긴 트랜잭션이다. 모바일 트랜잭션의 수행에 적합하다고 알려진 검증 기반 프로토콜은 데이타 일관성을 유지하기 위하여 충돌된 트랜잭션을 철회시킨다. 그러나 긴 트랜잭션을 철회하면 모든 작업 결과를 취소해야 하기 때문에 철회 방법은 모바일 트랜잭션 수행에 적합하지 않다. 이 논문에서는 충돌된 모바일 트랜잭션을 철회하지 않고 충돌을 해소하기 위하여 재수행 트랜잭션 모델을 제안한다. 그리고 재수행 트랜잭션을 지원하는 트랜잭션 서버를 설계하고 모바일 현장 시스템의 프로토타입을 구현하였다. 재수행 트랜잭션은 외래 충돌 객체를 이용하여 충돌 객체만을 재수정 하는 트랜잭션으로 완료를 요청한 트랜잭션의 충돌에 의해 시작되는 서브 트랜잭션이다. 그리고 재수행 트랜잭션의 기아 문제를 줄이기 위하여 쓰기 집합의 객체들 중 비충돌 객체는 다른 트랜잭션에게 노출시키는 점진적 재수 행 기법을 제시한다.

• 한국정보통신학회논문지
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• 제18권8호
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• pp.1941-1947
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• 2014

문서 이미지의 이진화는 문서 인식의 이전 단계에서 주로 사용되며, 이진화의 성공 여부에 따라 문서 인식의 결과에 영향을 미치는 중요한 단계로 볼 수 있다. 지금까지 문서 이미지를 이진화 하기 위한 다양한 기법들이 연구되었지만, 문서 이미지의 상태에 따라 그 결과는 다양하다. 본 논문에서는 객체 추출에 많이 이용되는 MSER(Maximally Stable Extremal Region)을 이용하여 문서 이미지를 이진화하는 기법을 제안한다. 먼저 문서 이미지에서 MSER 객체를 추출한다. 추출된 MSER 객체는 그 자체로 문서 이미지 이진화에 사용되기는 어렵기 때문에 사용하기 적합한 형태로 변경되는 과정을 거친다. 그리고 최종 MSER 객체와 문서 이미지로부터 추출한 대비 이진 이미지를 이용하여 최종 이진 이미지를 계산한다. 실험결과는 본 논문에서 제안한 방법이 문서 이미지의 이진화에 유용함을 보여준다.

• Pediatric Gastroenterology, Hepatology & Nutrition
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• 제26권1호
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• pp.1-14
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• 2023

Foreign body (FB) ingestion is a common health problem that affects children more than adults. According to gastroenterologists' guidelines, the management of FB ingestion differs slightly between adult and children. This review aimed to compile adult and children guidelines and establish an understandable association to reveal the requirements and timing of the endoscopic procedure, which is the most effective and least complicated technique for gastrointestinal FBs. Coins, pins, and chicken and fish bones have been the most commonly ingested FBs. However, with their increasing use in recent years, large batteries with lithiumion conversion, stronger magnets composed of rare earth metals, such as neodymium, and superabsorbent objects have become the most morbid and mortal, necessitating new management strategies. Although the approach to gastrointestinal FBs is controversial, with different treatment options available in different disciplines, many studies have demonstrated the efficacy and safety of endoscopic procedures. Many factors influence the timing of endoscopy, including the nature, size, and location of the ingested object and the patient's clinical condition.

• 한국항공운항학회지
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• 제22권1호
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• pp.130-135
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• 2014

FOD(Foreign Object Debris) has the potential threat to damage aircraft during critical phases of take-off and landing roll with some objects including metal on the runway. FOD can be found anywhere on an airport's air operation areas such as runway, taxiway and apron. It can lead to catastrophic loss of life and airframe, and increased maintenance and operating costs. In this paper, we defined FOD and surveyed its riskiness and necessity of automatic FOD detection system. We compared the requirements of the environment in Korea to the FAA advisory circular. Also we analyzed operation methods of FOD detection systems already installed at some airports. Based on the surveys mentioned above, we propose hybrid type of FOD detection system considering the environment in Korea which uses millimeter wave radar, optical camera and thermal imaging camera to detect FOD efficiently. In management approach, fixed type of the system should be installed for real-time monitoring, and mobile type of the system can be used additionally.

• Journal of Forest and Environmental Science
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• 제19권1호
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• pp.39-47
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• 2003

해외에 조성된 한국 전통조경의 특성과 디자인 성향을 파악하고자 해외에 설계, 시공되어진 대표적 한국성 정원 3개소를 선정하였다. 즉 프랑스 파리공원의 한국정원과 일본 오오사까의 쓰르미공원, 요꼬하마의 관자정 등이다. 이들 세 공간에 대해 한국고유의 디자인 원리와 image성, 경관구성요소 등의 한국성을 비교, 분석하였다. 그 결과 일본에 조성된 두 곳은 직설적 공간 재현을, 프랑스 파리공원은 직설과 은유적 공간 재현방법을 응용하여 전통을 재현 하고자 하였다. 도입된 시설 및 요소들은 정자, 꽃담, 다리 등의 전통 구조물과 조산(가산) 화계, 그리고 마당개념의 공간연출 등의 요소 및 기법이 공통적으로 응용되어 한국성 image를 표현하였다.

• 의학교육논단
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• 제10권1호
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• pp.9-17
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• 2008

Objectives: Medical schools are trying to improve the quality of medical education by offering students better medical curriculum. In this study, we intend to provide basic information for improvement and development of medical curriculum by analyzing the medical curriculum of domestic and foreign medical schools. Methods: Based on various materials, we selected out 5 domestic medical schools and 11 foreign medical schools and collected materials relevant to medical curriculum of each medical school. Then, we divided collected materials into four domains(educational objectives, educational contents, educational assessment, and curriculum implementation), and analyzed them synthetically. Results and Conclusion: First, concerning the educational objectives, it is necessary that more various educational objectives are included to medical curriculum. Especially, there is a growing need for medical curriculum reflecting social responsibility and requests of local community. Second, educational contents should be constantly improved and constructed considering students' academic achievement levels and traits. Third, not only students but also educational program, educational contents, and professors should be included to the objects of educational assessment. Also, various assessment methods should be developed. Finally, especially for domestic medical schools, it is necessary to make use of more educational specialists in medical education.