• 한국신뢰성학회지:신뢰성응용연구
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• 제8권2호
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• pp.101-111
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• 2008

Good diagnostics improves both the safety and system unavailability of digital safety systems. The measure of a diagnostic capability is called the Coverage Factor. Because the Failure Modes, Effects and Diagnostic Analysis (FMEDA) provides information on the failure rates and failure mode distributions necessary to calculate a diagnostic coverage factor for a component, the FMEDA can be used as a useful tool to calculate it. Through performing FMEDA on a digital signal processor (DSP) board used in a digital safety system, it is shown that some components of the DSP board can be replaced or improved to satisfy the required diagnostic coverage. That is, the FMEDA can serve as a useful verification tool to design a diagnostic capability for the DSP board.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2003년도 International Meeting on Information Display
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• pp.43-49
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• 2003

Low-temperature polysilicon (LTPS) technology has continued to mature with the passing of each year since LTPS mass production began. The integration of complex circuits has become possible with advances in microprocessing, leading to the realization of panels with highly advanced functions. At the same time, efforts have been made to meet market demands for lower costs, thereby boosting competitive strength. Today, LTPS-TFT LCDs have become standard equipment for the monitors of digital still cameras, and inroads are being made into the massive cellular phone market. Micro displays such as electronic viewfinders, which were previously only possible with high-temperature polysilicon technology, can now also be made with LTPS, thus expanding the scope of the technology. AMOLED displays using the LTPS-TFT as a back plane are also approaching the stage of industrialization. The hidden potential for the OLED to replace the familiar LCD has prompted Widespread anticipation for this emerging technology. This paper reflects on the history of LTPS technology, then looks forward to its future prospects and suggests a variety of potential fields of application.

• 한국환경과학회:학술대회논문집
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• 한국환경과학회 2003년도 International Symposium on Clean Environment
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• pp.33-36
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• 2003

Principal component analysis (PCA) was used to improve image classification by the unsupervised classification techniques, the K-means. To do this, I selected a Landsat TM scene of Jeju Island, Korea and proposed two methods for PCA： unstandardized PCA (UPCA) and standardized PCA (SPCA). The estimated accuracy of the image classification of Jeju area was computed by error matrix. The error matrix was derived from three unsupervised classification methods. Error matrices indicated that classifications done on the first three principal components for UPCA and SPCA of the scene were more accurate than those done on the seven bands of TM data and that also the results of UPCA and SPCA were better than those of the raw Landsat TM data. The classification of TM data by the K-means algorithm was particularly poor at distinguishing different land covers on the island. From the classification results, we also found that the principal component based classifications had characteristics independent of the unsupervised techniques (numerical algorithms) while the TM data based classifications were very dependent upon the techniques. This means that PCA data has uniform characteristics for image classification that are less affected by choice of classification scheme. In the results, we also found that UPCA results are better than SPCA since UPCA has wider range of digital number of an image.

• 디지털융복합연구
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• 제10권11호
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• pp.541-550
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• 2012

본 연구의 목적은 유산소성운동과 반신욕 처치의 차이가 비만 중년남성의 혈액성분, 호흡순환기능 및 혈관탄성에 어떠한 영향을 미치는가를 규명하기 위한 목적으로 수행되었다. 본 연구의 대상자는 비만 중년남성 30명을 선정하여 유산소성운동집단(n=10), 반신욕 처치집단(n=10), 통제집단(n=10)으로 구분하여 3집단으로 구성하였다. 이들은 12주간 유산소성운동프로그램 및 반신욕 처치 전 후 각 혈액성분, 호흡순환기능 및 혈관탄성의 변화를 살펴보기 위하여 반복이 있는 이원변량분석(repeated 2-way ANOVA)을 실시하였으며, Scheffe 방법을 이용하여 사후분석을 실시하였으며 다음과 같은 결과를 얻었다. 첫째, 12주간 처치 후 유산소성운동 참여집단의 모든 혈액성분은 반신욕집단과 통제집단에 비해 유의하게 감소 및 증가하였으며, 반신욕집단은 Triglyceride, LDL-C, HDL-C에서 통제집단에 비해 유의한 차이를 나타내었다. 특히, HDL-C의 수준은 유산소성 운동집단과 반신욕 집단간에 유의한 차이를 보이지 않았다. 둘째, 12주간 처치 후 최대산소섭취량, 최대심박수, 최대환기량은 유산소성 운동집단이 반신욕과 통제집단에 비해 유의하게 증가하였다. 그러나 반신욕집단과 통제집단간에는 유의한 차이가 나타나지 않았다. 셋째, 혈관탄성은 유산소 운동집단이 반신욕집단과 통제집단에 비해 왼팔,오른팔 및 왼다리, 오른다리에서 유의하게 향상된 것으로 나타났으며, 반신욕집단 역시 통제집단보다 혈관탄성이 향상된 것으로 나타났다. 이상의 결과를 종합하여 볼 때 유산소성 운동과 반신욕 참여는 비만 중년 남성의 혈액성분 개선과 혈류순환 및 혈관기능의 개선에 효과적인 것으로 나타났다.

• 한국콘텐츠학회논문지
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• 제14권7호
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• pp.518-528
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• 2014

본 연구는 서울시 강남구 U-street에 설치된 L.E.D 미디어 폴(Media pole)이라는 통합형 가로시설물이 보행 만족도에 어떠한 영향을 미치는지 분석하는 것이 주요 목적이다. 이를 위해 가로시설물로서 미디어폴의 구성요소를 보행자 관점에서 탐색적으로 살펴보고 이를 바탕으로 요인분석을 실시하였다. 요인분석을 통해 제1요인은 '심미 상징성'요인으로 명명하였고, 제2요인은 '형태 조형성', 제3요인은 '접근 연속성'으로 분석하였다. 제4요인은 '감각 전달성', 제5요인은 '정보 매체성'으로 명명하였다. 요인분석은 이용자 관점에서 사례대상지 보행자에 대한 행태관찰과 심층면접(In-depth Interview)을 실시하였고, 33개 예비변수를 도출하였다. 도출된 예비요인을 전문가 F.G.I(Focus Group Interview)를 통해 최종적으로 요인분석에서 사용할 20개 예비변수를 선정하였다. 요인분석을 통해 선정된 5개의 독립변수와 보행자의 만족도를 종속변수로 다중회귀분석을 실시한 결과 강남대로 U-street에 설치된 미디어 폴이 보행자의 보행만족도에 미치는 영향 중 통계학적 유의미한 영향요소는 '심미 상징성'요인으로 분석되었다. U-street에서 미디어 폴은 보행자에게 심미적 감성과 상징성으로 새로운 보행체험에 기여하고 있는 것으로 판단된다. 향후 이용자 편의성을 기반으로한 정보매체로서의 접근성을 강화하고 활용 가능한 콘텐츠 다양화를 유도해야할 것이다. IT 기반형 멀티미디어 매체인 미디어폴은 융합하는 가로환경과 융합하여 보행자에게 새로운 경험을 제공하여 보행활성화에 새로운 수단으로서의 가능성을 시사하고 있다.

• 디지털융복합연구
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• 제10권10호
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• pp.307-312
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• 2012

최근 논리적으로 표현된 지식 베이스를 사용하는 키워드 기반 검색에서 보다 더 정확한 결과를 제공하기 위해 시맨틱 검색 방법에 대한 연구가 진행되고 있다. 대부분의 사용자는 정형화된 질의어와 스키마를 사용하는 것 보다 사용자 키워드의 의미를 해석해서 사용한다. 본 논문에서는 시맨틱 검색을 위한 사용자 질의 확장을 제안한다. 제안 시스템에서는 지식 베이스와 연관 검색어를 활용한 사용자 질의 확장 콤포넌트와 사용자 질의 해석 결과를 조정하기 위한 콤포넌트를 제공한다. 마지막으로 논문에서 제안한 사용자 질의 의미 해석 기법의 검증을 위해 프로토타입 시스템의 실험 결과를 설명한다.

• 한국멀티미디어학회논문지
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• 제18권6호
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• pp.701-709
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• 2015

Image stitching method is a technique for obtaining an high-resolution image by combining two or more images. In X-ray image for clinical diagnosis, the size of the imaging region taken by one shot is limited due to the field-of-view of the equipment. Therefore, in order to obtain a high-resolution image including large regions such as a whole body, the synthesis of multiple X-ray images is required. In this paper, we propose a rapid stitching method of digital X-ray images using template-based registration. The proposed algorithm use principal component analysis(PCA) and k-nearest neighborhood(k-NN) to determine the location of input images before performing a template-based matching. After detecting the overlapping position using template-based matching, we synthesize input images by alpha blending. To improve the computational efficiency, reduced images are used for PCA and k-NN analysis. Experimental results showed that our method was more accurate comparing with the previous method with the improvement of the registration speed. Our stitching method could be usefully applied into the stitching of 2D or 3D multiple images.

• 기술경영경제학회:학술대회논문집
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• 기술경영경제학회 2006년도 제28회 동계학술발표회 논문집
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• pp.78-102
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• 2006

Networks, services and industries have been converging with the advent of digital convergence by technology advancements of digitalization, broadband and interactivity in the areas of information-communication and broadcasting technologies. Especially, this convergence of technology and market has been blurring the boundary of telecommunication and broadcasting sectors, and the severe competition seems to be inevitable due to the lack of the differentiation in broadcasting media and contents. In this study, we regard the competition phenomenon in the digital convergence between telecommunication and broadcasting as the platform competition in two-sided markets which have been actively studied since 2000, and analyzed it using modified Hotelling's location model. According to the analysis of platform competition on the effects of the differentiation of platform (t) , killer component $(\mu)$ and component compatibility $(\theta)$ , it is shown that two differentiated platforms are simultaneously used in case of the decrease of substitution effects, and the profit of platform with killer contents is increased, but the profit of platforms with higher compatibility is decreased. The policy implication is that it is especially necessary to modify the policy and regulation on media contents considering the growing competition in media. On the other hand, differentiated and reasonable policy is required to make fair competition and active market environment.

• 디지털산업정보학회논문지
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• 제9권2호
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• pp.111-119
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• 2013

Face recognition has recently become one of the most popular research areas in the fields of computer vision, machine learning, and pattern recognition because it spans numerous applications, such as access control, surveillance, security, credit-card verification, and criminal identification. In this paper, we propose a simple descriptor called an ECSP(Extended Center-Symmetric Pattern) for illumination-robust face recognition. The ECSP operator encodes the texture information of a local face region by emphasizing diagonal components of a previous CS-LBP(Center-Symmetric Local Binary Pattern). Here, the diagonal components are emphasized because facial textures along the diagonal direction contain much more information than those of other directions. The facial texture information of the ECSP operator is then used as the input image of an image covariance-based feature extraction algorithm such as 2D-PCA(Two-Dimensional Principal Component Analysis). Performance evaluation of the proposed approach was carried out using various binary pattern operators and recognition algorithms on the Yale B database. The experimental results demonstrated that the proposed approach achieved better recognition accuracy than other approaches, and we confirmed that the proposed approach is effective against illumination variation.

• 전기학회논문지
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• 제56권2호
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• pp.240-247
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• 2007

This paper presents an implementation of the generator protective relay using Real Time Digital Simulator (RTDS) user defined component (UDC) model designed to facilitate the investigation and evaluation of protective relays. The UDC for RTDS is a convenient model that allows user to develop new component models and run them on the RTDS. The developed model has major features related to the development of six models such as distance, frequency, reverse power, volts per Hz, over voltage, and out-of-step relays. Also, the generator relay models have been used to support and enhance power engineering education at both the undergraduate and graduate levels. The developed model functions are verified and tested by both static test and dynamic test. The simulation results show the capabilities of the developed generator relay using RTDS UDC.