• The Journal of the Acoustical Society of Korea
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• v.12 no.6
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• pp.70-76
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• 1993

본 논문은 음성만을 이용하여 계산할 수 있도록 하는 dam성 계산기 구현을 위한 기술에 관한 연구이다. 일정한 형식을 갖는 언어에 의하여 발생할 수 있는 다양한 형태의 구문을 언어 문법적 규칙을 기초로 해석하는 기능은 단독어 인식에서 문장인식으로 넘어가는 과정에서 필수적인 요소이다. 음성 계산기에 HMM과 LR 구문분석 기법을 적용하여 입력된 문장을 분석하고 잘못 인식된 단어를 문장에 맞도록 하였다. 구문분석하는 중에 수식의 의미도 해석하여 계산 결과를 출력해 내도록 하였다. 구문 분석을 사용하지 않은 방법에 비해서 잘못 인식할 가능성을 크게 줄였다.

• Proceedings of the Korean Information Science Society Conference
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• 1999.10c
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• pp.375-377
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• 1999

본 논문에서는 지금까지 제시된 다양한 동적 COS (CrossOver Switch) 선택 방식들을 4가지 유형을 분류하였다. 그리고 ATM 포럼에서 제안된 순방향 핸드오버와 역방향 핸드오버의 손실 방지 핸드오버와 손실허용 핸드오버 방식에 대해 COS의 위치에 따른 영향을 핸드오버 지연, 사용자의 서비스 중단 시간, 셀 버퍼링양 및 셀 손실 관점, 그리고 경로 재사용 효율과 종단간 전송 지연 관점에서 수식적으로 분석하였다. 이러한 분석을 바탕으로 무선 ATM의 역방향 핸드오버에 대한 적절한 COS 선택 기준을 각 방식별/성능 평가 요소별로 제시되었다.

• Proceedings of the Korean Information Science Society Conference
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• 2004.10a
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• pp.478-480
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• 2004

인터넷 기술의 발전과 더불어 서비스 거부 공격(DoS : Denial of Service) 방법과 유형이 날로 다양해지고 있다. DoS 공격은 사용자 시스템에 네트워크 트래픽의 과도한 부하를 주어 서비스를 마비시키거나 시스템을 다운시킨다. DoS공격은 빠른 시간 안에 시스템을 위협하는 특징 때문에, 빠른 대처가 필요하다. 이러한 점에 착안하여 본 논문에서는 DoS 공격상황에서의 위험상황을 모델링 한다. 제안된 모델링은 패킷분석에 기반 하여 의미 있는 요소들을 찾아내고, 수식화 해서 위험 탐지 모델을 정의한다. 제안된 모델링을 통해서 DoS공격을 효과적으로 대처할 수 있을 것으로 기대된다.

• The Journal of the Convergence on Culture Technology
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• v.7 no.3
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• pp.353-358
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• 2021

This study provides the syntactic analysis for the agreement attraction by proposing three types of syntactic subject-verb agreement. Because subject-verb number agreement codifies the link between a predicate and its subject, it must be the purely syntactic processes of the head-to-head agreement or the feature percolation, where relevant agreement features percolate upward or downward through the hierarchical syntactic structure. The agreement errors are not affected by linear proximity or minimal interference, but instead are affected by the hierarchical relationship between an agreement target and a local attractor. The data in this paper includes the complex noun phrases with a modifier PP or a relative clause CP. Here, the [+PL] feature is suggested to be a local attractor for subject-verb agreement errors as a strong feature. Therefore, speakers tend to erroneously produce plural agreement for a singular subject in a main clause due to a plural NP in a modifier PP or plural agreement for a singular subject in a relative clause due to plural main subject.

• The Transactions of the Korea Information Processing Society
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• v.2 no.6
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• pp.937-946
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• 1995

We proposed and efficient block segmentation and classification method for the document analysis using SGLDM(spatial gray level dependence matrix) and BP (back Propagation) neural network. Seven texture features are extracted directly from the SGLDM of each gray-level block image, and by using the nonlinear classifier of neural network BP, we can classify document blocks into 9 categories. The proposed method classifies the equation block, the table block and the flow chart block, which are mostly composed of the characters, out of the blocks that are conventionally classified as non-character blocks. By applying Sobel operator on the gray-level document image beforebinarization, we can reduce the effect of the background noises, and by using the additional horizontal-vertical smoothing as well as the vertical-horizontal smoothing of images, we can obtain an effective block segmentation that does not lead to the segmentation into small pieces. The result of experiment shows that a document can be segmented and classified into the character blocks of large fonts, small fonts, the character recognigible candidates of tables, flow charts, equations, and the non-character blocks of photos, figures, and graphs.

• Journal of the Korean Society for Library and Information Science
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• v.56 no.2
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• pp.255-276
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• 2022

This study aims to analyze the names of public libraries in Korea to reveal the problems of naming and suggest alternatives of naming. As of the end of 2020, 937 out of 1,172 public libraries, excluding 235 libraries of the Provincial & Municipal Education Offices, were divided into three groups by library service target and operating organization, and each library name was analyzed. The study reveals that there were 8 basic types and 31 detailed types of local library names, and 5 basic types and 18 detailed types of children's and youth libraries. In the case of private libraries, it was found that there are 5 types of names. The study also reveals that there are several problems in naming, such as the use of two or three place names in one name, the use of unnecessary modifiers, and the indication of library founder and grade.

• Journal of Science Education
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• v.45 no.2
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• pp.247-256
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• 2021

Visual representation has been a useful tool in mathematical problem solving because it vividly express and structure the variables in the problem. But its effects may vary according to the types of problems. So, this study analyzes the survey results on the 5^th graders' visual representations using questionnaire consisting of the routine problems and the non-routine problems. The results are follows: The rate of correct answers in routine problems was higher than that of the non-routine problems. Even though the subjects were asked to solve the problem using visual representations, the ratio of solving the problem using the numerical expression was high in the routine problems. On the other hand, the rate of solving the problem using visual representation was high in the non-routine problems. The number of respondents who used visual representation in the non-routine problems was twice as many as that of the routine problems. But, among the subjects who used visual representation in the non-routine problems, the proportion of incorrect answers was also high, which resulted in using visual pictures. So, it is necessary to provide an experience that can use various types of the visual representations for problem solving and pay attention to the process of converting problems into visual representations.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.33 no.12
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• pp.92-100
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• 2005

An aircraft wing or fuselage panel of skin-stringer assembly can fail in a variety of instable modes under compression loads. Instability modes can be buckling of the panel, local buckling of the stringer, flexure, torsion, wrinkle and combined flexural/torsional buckling of the panel assembly. Although researches on these buckling behaviors have been carried out for a long time, there are some difficulties to apply to the practice because of complex theoretical and empirical equations. Accordingly, It is well known that leading aerospace companies are using their own in-house programs for the convenience of practical usage, but our domestic situation is that no such program has been ever developed. In this study a comprehensive program has been developed, which can identify the instability modes and the magnitude of reserve factor of the modes for the skin/stringer panel assembly under compression load. The developed program is based on the theory manual of the Airbus program APA114. For the verification, calculation of the instable reserve factors for the A320 wing panel and A380 low wing panel sections were carried out and compared with results by APA114.

• Proceedings of the Korea Contents Association Conference
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• 2006.05a
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• pp.140-143
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• 2006

In this paper, we describe a question-answering system which extracts answers for the superlative questions which include the superlative words such as "the most", "the best", "the first", "the largest", "the least", and so on. The superlative questions are composed of four main components and others. Four main components are the superlative word, answer type, regional information, and a verb modified by the superlative word. We classify the superlative words into two types as to whether the verb has to be needed to be a question or not. The superlative word, answer type and regional information are essential elements to extract answer for all superlative questions. But the verb may be an essential element by the type of superlative word. Our system analyzes input question, and finds four main components of the superlative question. Also, our system searches relative documents and candidate sentences using them, and extracts answers from candidate sentences. Empirical result shows that our system has high precision and high recall for the superlative questions.

• Journal of the Korea Society for Simulation
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• v.26 no.3
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• pp.35-46
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• 2017

Spare engine plays an important role for securing readiness of military strength during unexpected fault occurrences and field/depot planned maintenances. The purpose of this research is to present an approach towards the optimal number of spare engines/modules for diversity of aircraft types. We first reviewed two representative approaches, METRIC and meta model. We then investigated military aircrafts and categorized them into 5 types with regard to the engine type and number of engines/modules per aircraft. Through rigorous investigation of planned/non-planned maintenance of each type, we drew parameters and variables involved. As known, due to the complexity of the problem, it is impossible to develop a simple mathematical model with a closed form solution. Based on the airbase operation and maintenance logic with parameters/variable drawn, we developed a simulation model using ARENA well representing real field exercises. For the optimal solution, we applied OptQuest. It has shown that the program developed generates reliable results through a set of case examples.