• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.8
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• pp.1575-1580
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• 2012

In this paper, a DVB-T2(Digital Video Broadcasting-the 2nd Generation Terrestrial) receiver is designed under a USB-type windows environment, and the baseband frames for MPEG2-TS stream(File or Ethernet Modes) are analyzed for verifying the receiver. In addition, the performance of the BICM(Bit Interleaved Coding & Modulation) module in the receiver is analyzed in terms of PLP(Physical Layer Pipe) and L1(Layer 1) signals.

• The Journal of Information Technology
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• v.2 no.2
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• pp.35-49
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• 1999

This papar describes an design and implementation of a rule builder, named SGML DTD(Document Type Definition) Editor conforming to ISO 8879(SGML : Standard Generalized Markup Language). SGML DTD define types of logical structure in documents and it is very hard to managing, operating with general common text editors because of it's complex structures. Therefore, We studied DTD automatic editor and production system, prototype system, direct operations on graphic trees in the environment of windows. It's easy to handle with general users. So, We analyzed the structures of document, and studied about SGML documents operation models. And also described logical structures by tree on Windows.

• Annual Conference on Human and Language Technology
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• 2014.10a
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• pp.95-99
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• 2014

본 논문에서는 최근 급속히 증가하여 사회적 이슈가 되고 있는 SMS 스팸 필터링을 위한 듀얼 SMS 스팸필터링 기법을 제안한다. 지속적으로 증가하고 새롭게 변형되는 SMS 문자 필터링을 위해서는 패턴 및 스팸 단어 사전을 통한 필터링은 많은 수작업을 요구하여 부적합하다. 그리하여 기계 학습을 이용한 자동화 시스템 구축이 요구되고 있으며, 효과적인 기계 학습을 위해서는 자질 선택과 자질의 가중치 책정 방법이 중요하다. 하지만 SMS 문자 특성상 문장들이 짧기 때문에 출현하는 자질의 수가 적어 분류의 어려움을 겪게 된다. 이 같은 문제를 개선하기 위하여 본 논문에서는 슬라이딩 윈도우 기반 N-gram 확장을 통해 자질을 확장하고, 확장된 자질로 그래프를 구축하여 얕은 구조적 특징을 표현한다. 학습 데이터에 출현한 N-gram 자질을 정점(Vertex)으로, 자질의 출현 빈도를 그래프의 간선(Edge)의 가중치로 설정하여 햄(HAM)과 스팸(SPAM) 그래프를 각각 구성한다. 이렇게 구성된 그래프를 바탕으로 노드의 중요도와 간선의 가중치를 활용하여 최종적인 자질의 가중치를 결정한다. 입력 문자가 도착하면 스팸과 햄의 그래프를 각각 이용하여 입력 문자의 2개의 자질 벡터(Vector)를 생성한다. 생성된 자질 벡터를 지지 벡터 기계(Support Vector Machine)를 이용하여 각 SVM 확률 값(Probability Score)을 얻어 스팸 여부를 결정한다. 3가지의 실험환경에서 바이그램 자질과 이진 가중치를 사용한 기본 시스템보다 F1-Score의 약 최대 2.7%, 최소 0.5%까지 향상되었으며, 결과적으로 평균 약 1.35%의 성능 향상을 얻을 수 있었다.

• Journal of the Korean Society for Library and Information Science
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• v.30 no.4
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• pp.85-104
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• 1996

The purpose of this study is to analyze the edition of 21 of the Dewey Decimal Classificatin. Edition 21 includes major revisions of three schedules : 350-354 Public administration, 370 Education, and 560-590 Life sciences. The aim of Edition 21 was user convenience, Regularization, Faceting, Terminology, International needs and Cooperative development and Changes in the database. The Dewey Decimal Classification is preparing for the future in a number of ways. Editorial work is supported by a UNIX-based system and access to online bibliographic databases. Two edition of Electronic Dewey have been published and a Windows version have been published.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.10 no.4
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• pp.758-763
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• 2006

In various fields of basic science and engineering, in order to present signals and systems exactly and acquire useful information from spatial and timely changes, many researches have been processed. In these methods, the Fourier transform which represents signal as the combination of the frequency component has been applied to the most fields. But as transform not to consider time information, the Fourier transform has its limitations of application. To overcome this problem, a variety of methods including the wavelet transform have been proposed. As transform to represent signal by using the changing window, according to scale parameter in time-scale domain, the wavelet transform is capable of multiresolution analysis and defines various functions according to the application environments. In this paper, to detect features of signal we analyzed wavelet the spectrum by using the basis function of the fourier transform.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2002.11a
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• pp.1-6
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• 2002

To provide an easy operation of drift prediction model in SAR(search and rescue) mission a GUI program running on Window environment has developed. Users can make choice of input data on the screen by just clicking the mouse and the prediction results of datum points and trajectories of vessels are drawn on the map. The program contains both Leeway Equation model and mathematical model. The FORTRAN language was used in programming and Lehay Winteracter 4.0 software was utilized for graphic presentation. The result of May, 2001 Busan field experiment was plotted with that of model prediction for demonstration purpose.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.7
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• pp.1437-1446
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• 2012

In this paper we propose a new stereo matching algorithm which is suitable for application to obtain depth information with high-speed in stereoscopic camera environment. For satisfying these condition we propose a new adaptive stereo matching technique using frequency information in discrete wavelet (DWT) domain and variable matching window. The size of the matching window is selected by analysis of the local property of the image in spatial domain and the feature and scaling factor of the matching window is selected by the frequency property in the frequency domain. For using frequency information we use local DWT and global DWT. We identified that the proposed technique has better peak noise to signal ratio (PSNR) than the fixed matching techniques with similar complexity.

• The Transactions of the Korea Information Processing Society
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• v.6 no.8
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• pp.2020-2030
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• 1999

Data acquired about 53 gigabyte per a naval vessel is massive, expensive and impossible to be retested in a underwater acoustic measurement. So, it is required to manage systematically. In this paper, we mention MUADS (Massive Underwater Acoustic Database System) that was developed to store a long time, manage systematically and supply raw data and analyzed data. we analyze client/server performance based on 6003 input data individually in our MUADS that Unix server having a massive DC-jukebox and Windows clients.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.17 no.12
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• pp.1412-1422
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• 1992

This paper describes an implementation of the document class editor based on ODA(Open Document Architecture). For processing, we divided document structure into generic logical structure and generic layout structure as ODA standard. Also this editor could edit document profile. Using the utility which was implemented to investigate the composed document by object. we confirmed the document. And we could verify the ODIF stream data of the document. We designed this editor based on DAP level 2 of international functional standard. This system was implemented in environment of the X window system and the Motif as graphical user interface. This document class editor will be used to create real document having specific document structure.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 1997.11a
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• pp.168-173
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• 1997

시선의 추출을 통해 사용자의 관심 방향을 알고자하는 연구는 여러 분야에 응용될 수 있는데, 대표적인 것이 장애인의 컴퓨터 이용이나, 다중 윈도우에서 마우스의 기능 대용 및, VR에서의 위치 추적 장비의 대용 그리고 원격 회의 시스템에서의 view controlling등이다. 기존의 대부분의 연구들에서는 얼굴의 입력된 동영상으로부터 얼굴의 3차원 움직임량(rotation, translation)을 구하는데 중점을 두고 있으나 [1][2], 모니터, 카메라, 얼굴 좌표계간의 복잡한 변환 과정때문에 이를 바탕으로 사용자의 응시 위치를 파악하고자하는 연구는 거으 이루어지지 않고 있다. 본 논문에서는 일반 사무실 환경에서 입력된 얼굴 동영상으로부터 얼굴 영역 및 얼굴내의 눈, 코, 입 영역 등을 추출함으로써 모니터의 일정 영역을 응시하는 순간 변화된 특징점들의 위치 및 특징점들이 형성하는 기하학적 모양의 변화를 바탕으로 응시 위치를 계산하였다. 이때 앞의 세 좌표계간의 복잡한 변환 관계를 해결하기 위하여, 신경망 구조(다층 퍼셉트론)을 이용하였다. 신경망의 학습 과정을 위해서는 모니터 화면을 15영역(가로 5등분, 세로 3등분)으로 분할하여 각 영역의 중심점을 응시할 때 추출된 특징점들을 사용하였다. 이때 학습된 15개의 응시 위치이외에 또 다른 응시 영역에 대한 출력값을 얻기 위해, 출력 함수로 연속적이고 미분가능한 함수(linear output function)를 사용하였다. 실험 결과 신경망을 이용한 응시위치 파악 결과가 선형 보간법[3]을 사용한 결과보다 정확한 성능을 나타냈다.