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이웅재 서울여자대학교 컴퓨터과학연구소 2004 정보기술논문지 Vol.3 No.-
최근 들어 자연어 처리의 연구에 관한 관심은 증대되고 있으나 자연어 생성에 관한 연구는 자연어 분석 및 이해에 비해 주목을 받지 못하고 있다[1]. Web상에서의 다국어간 기계번역, 자연어 인터페이스, 자연어 검색 시스템 등 자연어처리에 관한 필요성이 증가함에 따라 자연어 생성의 필요성도 자연히 증가하고 있는 실정이다. 본 논문에서는 일반적인 언어 생성 알고리즘에 적용할 수 있는 문장 생성의 세 단계 절차에 대해 기술하며 특히 세 번째 단계의 변환규칙에 대해 중점적으로 논한다. In natural language research, the language generation had been relatively less interested than understanding. However, need for natural language generation is growing rapidly as application systems, especially multi-language machine translation systems on the Web, natural language interface systems, natural language query systems need more complex messages to generate. In this paper, a three step procedure for sentence generation is introduced. It is designed to be applied to any language generation algorithm. Specially it focuses on describing the transformation rule of step three.
이웅재 서울여자대학교 자연과학연구소 1999 자연과학연구논문집 Vol.11 No.-
Lexical cohesion is essential to the generation of acceptable expository text. Lexical Functions are fundamental to the production of lexically cohesive text, both in the choice of referring expressions and in the construction of appropriate collocations. This paper describes a text generator designed to output paragraph length explanations, which produces lexical cohesion using the Lexical Functions(LFs) of Igor MeI'cuk.
이웅재,정희연,김희연,김혜주 서울여자대학교 자연과학연구소 2001 자연과학연구논문집 Vol.13 No.-
In order to understand natural language, we have to follow the process "Input → Lexical Analysis → Syntactic Analysis → Semantic Analysis". Among those, "syntactic analysis" plays the most important role since it is able to be applied to various fields such as natural language query systems, natural language interface systems, text summary systems, and machine translation systems. It is also important to analyze a sentence containing ambiguity. In this paper, we propose an algorithm to parse the Korean language using chart. It is implemented using Prolog programming language.
이웅재 서울여자대학교 자연과학연구소 2002 자연과학연구논문집 Vol.14 No.-
Part-of-speech tagging is the process of assigning the most likely tag to each word in a given sentence. Based on the approach used, we can classify it as follows: Statistical Approach, Rule-Based Approach, Hybrid Approach, and Neural Network Approach. The statistical approach have been widely used for natural language processing. Part-of-speech tagging is one of the field which can be solved by the statistical approach. In this paper, various systems based on the statistical approach are explained and analyzed in terms of its characteristics.
이웅재 서울여자대학교 컴퓨터과학연구소 2003 정보기술논문지 Vol.1 No.-
최근 들어 자연어 처리의 연구에 관한 관심은 증대되고 있으나 자연어 생성에 관한 연구는 자연어 분석 및 이해에 비해 주목을 받지 못하고 있다. Web상에서의 다국어간 기계번역, 자연어 인터페이스, 자연어 검색 시스템 등 자연어처리에 관한 필요성이 증가함에 따라 자연어 생성의 필요성도 자연히 증가하고 있는 실정이다. 본 논문에서는 언어의 기능적인 역할을 기술할 목적에서 탄생한 시스테믹 문법과 문장 생성과의 연관성을 밝혀냄으로서 시스테믹 문법을 문장생성의 도구로서 사용할 수 있는 방향을 제시하고자 한다 Natural language generation had been relatively less attention than understanding. However, need for natural language generation is growing rapidly as application systems, especially multi-language machine translation systems on the web, natural language interface systems, natural language query systems need more complex messages to generate. In this paper, we analyze the systemic grammar in terms of language generation. By analyzing the relevance of these two, we can find out how the systemic grammar can be used as a tool of language generation.
BCTZ첨가가 NKLN-AS계 압전세라믹스의 미세구조와 압전/유전특성 및 상전이현상에 미치는 효과
이웅재,어순철,이영근,윤만순,Lee, Woong-Jae,Ur, Soon-Chul,Lee, Young-Geun,Yoon, Man-Soon 한국재료학회 2012 한국재료학회지 Vol.22 No.1
Presently, the most promising family of lead-free piezoelectric ceramics is based on $K_{0.5}Na_{0.5}NbO_3$(KNN). Lithium, silver and antimony co-doped KNN ceramics show high piezoelectric properties at room temperature, but often suffer from abnormal grain growth. In the present work, the $(Ba_{0.85}Ca_{0.15})(Ti_{0.88}Zr_{0.12})O_3$ component, which has relaxor ferroelectric characteristics, was doped to suppress the abnormal grain growth. To investigate this effect, Lead-Free $0.95(K_{0.5}Na_{0.5})_{0.95}Li_{0.05}NbO_3-(0.05-x)AgSbO_3-x(Ba_{0.85}Ca_{0.15})(Ti_{0.88}Zr_{0.12})O_3$[KNLN-AS-xBCTZ] piezoelectric ceramics were synthesized by ball mill and nanosized-milling processes in lead-Free $0.95(K_{0.5}Na_{0.5})_{0.95}Li_{0.05}NbO_3-(0.05-x)AgSbO_3$ in order to suppress the abnormal grain growth. The nanosized milling process of calcined powders enhanced the sintering density. The phase structure, microstructure, and ferroelectric and piezoelectric properties of the KNLN-AS ceramics were systematically investigated. XRD patterns for the doped and undoped samples showed perovskite phase while tetragonality was increased with increasing BCZT content, which increase was closely related to the decrease of TO-T. Dense and uniform microstructures were observed for all of the doped BCZT ceramics. After the addition of BCTZ, the tetragonal-cubic and orthorhombic-tetragonal phase transitions shifted to lower temperatures compared to those for the pure KNNL-AS. A coexistence of the orthorhombic and tetragonal phases was hence formed in the ceramics with x = 0.02 mol at room temperature, leading to a significant enhancement of the piezoelectric properties. For the composition with x = 0.02 mol, the piezoelectric properties showed optimum values of: $d_{33}$ = 185 pC/N, $k_P$ = 41%, $T_C=325^{\circ}C$, $T_{O-T}=-4^{\circ}C$.