• 한국HCI학회:학술대회논문집
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• 2009.02a
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• pp.278-284
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• 2009

Multimodal data to have several modalities such as videos, images, sounds and texts for one contents is increasing. Since this type of data has ill-defined format, it is not easy to represent the crossmodal information for them explicitly. So, we proposed new method to extract and analyze vision-language crossmodal association information using the documentaries video data about the nature. We collected pairs of images and captions from 3 genres of documentaries such as jungle, ocean and universe, and extracted a set of visual words and that of text words from them. We found out that two modal data have semantic association on crossmodal association information from this analysis.

• Journal of Advanced Navigation Technology
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• v.20 no.4
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• pp.380-385
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• 2016

Shadows are common phenomena observed in natural scenes and often bring a major problem that is affected negatively in colour image analysis. It is important to detect the shadow areas and should be considered in the pre-processing of computer vision. In this paper, the method of shadow detection is proposed using cross entropy and intensity image, and is performed in single image based on the satellite images. After converting the color image to a gray level image, the shadow candidate region has been estimated the optimal threshold value by cross entropy, and then the final shadow region has been detected using intensity image. For the validity of the proposed method, the satellite images is used to experiment. Some experiments are conducted so as to verify the proposed method, and as a result, shadow detection is well performed.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.457-458
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• 2011

국내 전력수요의 지속적인 성장과 더불어 안정적이고 신뢰성있는 전력계통 운영은 매우 중요한 일이다. 1970년대 이후 대도시를 중심으로 지중 송전에 대한 사회적 요구가 커지면서, 매년 국내 전력시스템에서 지중 송전선로 건설 및 운영이 매우 빠르게 진행되어 왔다. 그래서 지중 케이블의 고장으로 인한 사회적 영향 및 파장이 매우 커지고 있는 실정이다. 특히 지중케이블의 특성상 고장복구에 필요한 시간과 돈은 매우 크다고 할 수 있다. 그래서 국내 지중 및 해저 송전선로에서는 신속한 고장복구를 위한 빠르고 정확한 고장점 탐지가 매우 중요하게 되었다. 특히 국내 지중송전선로 시스템에서 채용하고 있는 크로스본딩 시스템은 현재 국내외적으로 고장점 탐지를 위해 사용하고 있는 레이더의 원리를 이용한 TDR(Time Domain Reflectrometer) 방법으로는 크로스본딩점에서 발생된 임피던스 변화로 인하여 신속하고 정확한 고장점 탐지에 어려움을 주고 있다. 본 논문에서는 국내 지중송전케이블에서 채용하고 있는 크로스본딩 시스템에서도 TDR을 이용하여 신속 정확한 고장점 탐지를 가능하게 할 수 있는 방법을 제시하고 실계통에서의 실증시험 결과를 보여주고자 한다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2009.11a
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• pp.147-150
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• 2009

초고속 통신망의 발전으로 인터넷을 통한 고화질 비디오 서비스가 가능해지고, IPTV 서비스 등이 등장하는 등 방송과 통신의 융합서비스가 본격화되고 있다. 그러나 우리나라의 IPTV 서비스는 대용량의 데이터를 일정한 품질로 제공하기 위해서 막대한 투자비가 소요되는 망 구축이 필요하며, 오픈 네트워크인 기존의 인터넷과 달리 폐쇄적인 구조로 운영되고 있다. 대용량 전송의 장점을 가진 방송망과 양방향 특성을 가진 통신망을 같이 활용하는 DTV기반 크로스미디어 서비스 환경에서는 양방향 비디오 서비스를 보다 효율적으로 제공하는 것이 가능할 것으로 기대된다. 이를 통해 TV 시청자에게는 개인화된 형태의 새로운 서비스를 제공하고, 방송사에게는 전통적인 사업모델을 탈피하여 새로운 비즈니스 모델을 찾을 수 있는 기회를 줄 수 있다. 이미 유사한 개념의 서비스들이 국내외에서 다양하게 시도되고 있다. 본 논문에서는 지상파 방송망과 유무선 인터넷에 연결 가능한 크로스미디어 서비스 환경에서 시청자에게 제공 가능한 서비스 시나리오를 제시하고, 이를 위한 수신기 요소 기술을 제안한다. 서비스를 위한 콘텐츠 전송 기술로서 인터넷을 이용한 HTTP 기술과 방송망을 이용한 Push 기술을 활용하였고, 서비스 내용을 시청자에게 보여주기 위한 표현 기술로서 TV용 브라우저를 목표로 설계된 CEA-2014 규격을 활용하였다. 또한 CEA-2014가 제공하지 못하는 더 필요한 기능들을 위해 수신기 API를 추가로 정의하였고, 서비스에 필요한 데이터 공유와 활용을 위하여 메타데이터 모델을 정의하였다. 그리고 제안한 수신기 요소 기술들의 적합성을 보여주기 위하여 핵심 시나리오에 대한 테스트 모델을 만들고 이에 대한 프로토타입 시스템을 구현하였다.

• The Journal of the Korea Contents Association
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• v.8 no.6
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• pp.82-88
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• 2008

ARM processors are being utilized in a variety of embedded systems. It is also that most ARM processor accepts C application, and then generates ARM assembly code using GNU gcc Cross-compiler. For the purpose of improving the quality of code generated and the efficient code generation, the various researches are underway. In this paper, we generates the ARM assembly code from the ANSI C programs using Syntax-directed Translation Techniques, and then the performance evaluation results for our research experimental compare to GNU gcc Cross-compiler are described. The techniques are presented in this research compared to GNU gcc cross-compiler very simple and convenient in extension of the production rules.

• Journal of the Korea Computer Industry Society
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• v.4 no.12
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• pp.953-964
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• 2003

In the block matching algorithm, search patterns of different shapes or sizes and the distribution of motion vectors have a large impact on both the searching speed and the image quality. In this paper, we propose a new fast block matching algorithm using the cross pattern and the flat-hexagon search pattern. Our algorithm first finds the motion vectors that are close to the center of search window using the cross pattern, and then lastly finds the other motion vectors that are not close to the center of search window using the flat-hexagon search pattern. Through experiments, compared with the hexagon-based search algorithm(HEXBS), the proposed cross pattern and flat-hexagonal pattern search algorithm(CFHPS ) improves about 0.2-6.2% in terms of average number of search point per motion vector estimation and improves about 0.02-0.31dB in terms of PSNR(Peak Signal to Noise Ratio).

• The Journal of the Korea Contents Association
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• v.7 no.10
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• pp.1-9
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• 2007

Allocation and management of the resource is very important in wireless networks because the wireless resource is limited. Therefore, the importance of designing cross layer, which adapt between different layers, is on the rise. In this paper, we investigate the scheduling techniques of the cross layer. This paper researches conventional scheduling methods and proposes the complementary scheduling method. On multimedia environment, the scheduling method must be applied variably because of offering variable services. Therefore, this paper proposes the new scheduling method according to the variable services. The proposed method shows that utility efficiency of the wireless resource more excellent than the conventional method through the simulations.

• Journal of The Korean Association of Information Education
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• v.16 no.2
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• pp.189-199
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• 2012

Recently with the advent of smart devices, various educational apps are being developed for smart learning. However, the existing native apps to run on a particular device, the device is not compatible. A new way to develop apps, webapp written using the HTML5 has the advantage of cross-platform support. We developed the webapp using HTML5 for learning lever in elementary school science curriculum. We conducted an expert evaluation for the web app of educative usability. The expert group was comprised of elementary school teacher. In result, it was evaluated lever learning content and webapp have high educational value.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.41 no.6
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• pp.17-24
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• 2004

This paper describes a novel bit line structure to minimize coupling noise induced by coupling capacitance between bit lines. In DRAMs coupling capacitance is inherently present bit lines. As in submicron process the bit line space gets narrower. bit line coupling capacitance increases and this increased coupling capacitance sharply raises cross-talk noise. In this paper using different layers of metal for adjacent bit lines has been tested to reduces cross-talk noise and a novel bit line structure capable of reducing capacitance is introduced and verified.

• Journal of Korea Game Society
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• v.20 no.4
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• pp.11-20
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• 2020

In the rapidly changing mobile app market, it is crucial to develop a good idea quickly and receive its market evaluation. For a small-sized company, however, it is very challenging to rapidly develop and deploy their products in response to highly fragmented mobile environments. This article demonstrates that our integrated development environment using both React Native and Unity3D when developing a mobile app achieves a high level of functionality and performance requirements successfully. Moreover, this integrated environment helps reduce development costs and shorten development time.