• 한국전자파학회논문지
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• 제24권2호
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• pp.198-206
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• 2013

본 논문에서는 다기능 레이더의 추적 성능 개선을 위해 임무 우선 순위 선정을 위한 퍼지 추론 시스템 기반의 기법을 제안하였다. 제안한 기법은 추적 임무 수행 시 우선 순위 결정 트리를 구성하고, 퍼지 집합으로 추적 안정도, 위협도, 접근성을 선정하고, 퍼지 규칙을 통한 추적 임무의 우선 순위를 얻는 방식이다. 우선 순위를 높게 책정할 경우, 추적 주기를 변화시켜 추적의 정확도를 높일 수 있도록 설계하였다. 추적 성능 개선 효과를 입증하기 위해 기동 특성이 뚜렷한 표적 궤적을 생성하고, 제안된 기법을 적용한 경우와 적용하지 않은 경우를 시뮬레이션으로 비교 분석하였다.

• 정보처리학회논문지C
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• 제18C권5호
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• pp.317-326
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• 2011

본 논문은 다양한 보안방어 정책과 기기들이 산재해 있으나, 이를 표준화하여, 각 방어정책의 특성과 방어기법을 새롭게 정의함으로써 기존 네트워크 인프라 구현을 포함한 새로운 보안정책 도입 및 추가 구현 시 관리자 또는 사용자가 손쉽게 정책을 추가하고 바로 적용 가능하도록 각 보안 분야별 정책과 기기를 명세 보고서화 하는데 의의가 있다. 따라서 하나의 네트워크 보안기기를 기반으로 부여 가능한 정책들을 분류하는 ONSU-MF(One Network Security Unit-Multi Function)기법과 하나의 보안기기로 다양한 보안방안을 구현하는 OSD-MD(One Security Device-Multi Defense)기법으로 구분하고 이를 통합한 표준화 구현기법을 통해 향후 네트워크 보안 인프라 개선 메커니즘을 제안코자 한다.

• 한국공작기계학회논문집
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• 제16권4호
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• pp.36-44
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• 2007

This paper is focused on the optimum design for decreasing volume and increasing reliability of multi-stage gear drive. For the optimization on volume and reliability, multi-objective optimization is used. The genetic algorithm is introduced to multi-objective optimization method and it is used to develop the optimum design program using exterior penalty function method to solve the complicated subject conditions. A 5 staged gear drive(geared motor) is chosen to compare the result of developed optimum design method with the existing design. Each of the volume objective, reliability objective, and volume-reliability multi-objectives are performed and compared with existing design. As a result, optimum solutions are produced, which decrease volume and increase reliability. It is shown that the developed design method is good for multi-stage gear drive design.

• Nuclear Engineering and Technology
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• 제48권6호
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• pp.1360-1367
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• 2016

This paper introduces a boron meter with improved accuracy compared with other commercially available boron meters. Its design includes a new fitting function and a multi-detector. In pressurized water reactors (PWRs) in Korea, many boron meters have been used to continuously monitor boron concentration in reactor coolant. However, it is difficult to use the boron meters in practice because the measurement uncertainty is high. For this reason, there has been a strong demand for improvement in their accuracy. In this work, a boron meter evaluation model was developed, and two approaches were considered to improve the boron meter accuracy: the first approach uses a new fitting function and the second approach uses a multi-detector. With the new fitting function, the boron concentration error was decreased from 3.30 ppm to 0.73 ppm. With the multi-detector, the count signals were contaminated with noise such as field measurement data, and analyses were repeated 1,000 times to obtain average and standard deviations of the boron concentration errors. Finally, using the new fitting formulation and multi-detector together, the average error was decreased from 5.95 ppm to 1.83 ppm and its standard deviation was decreased from 0.64 ppm to 0.26 ppm. This result represents a great improvement of the boron meter accuracy.

• 한국전자파학회논문지
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• 제30권1호
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• pp.70-78
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• 2019

본 논문에서 통합 전장 시뮬레이터 환경인 AddSIM에서 레이다 동작을 모의하기 위한 고해상도 다기능 레이다의 모델링을 제안한다. 다기능 레이다 모델을 AddSIM에 연동하기 위해, 모델링은 물리부, 논리부, 정보부로 구성된 컴포넌트 기반의 구조를 가져야 한다. 이를 위해, 레이다의 RF 하드웨어부를 물리부로, 제어부를 논리부로, 레이다의 RF 제원을 정보부로 각각 분리한다. 레이다의 물리부/논리부에 대한 세부 모델링 방법을 기술하며, 공학급 레벨의 시뮬레이션을 위한 데이터 구조 또한 제시한다. 다중 표적이 교전하는 시나리오에서 다기능 레이다의 성능이 수치적으로 분석하며 제안된 모델에 대한 타당성을 검증한다.

• 한국지역사회생활과학회지
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• 제19권4호
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• pp.619-640
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• 2008

The objective of this study is to promote alternative plans on the prejudiced and distorted parts in school textbooks in the aspect of multi-functionality of agriculture and rural community. This was done through analysis of the contents in 44 kinds of schoolbooks in Korean language (30 of elementary school, 12 of middle school and 2 of high school). This will lead to promote the understanding about the multi-functionality and form the proper value system related to agriculture and rural community for children and juveniles using schoolbooks. A content analysis which is a research tool to classify all contents of materials containing the properties to become the object of interest in a systematic way, was employed to examine to what extent the contents on agriculture and rural community were reflected in the textbooks for elementary school, middle school and high school. The content analysis was done in two categories, namely; application method and function view. Application method had four types of texts, cases, figures pictures, and activities, while function view emphasized the relevance for the multi-functionality of agriculture and rural community (i.e., function of environment preservation, function of rural scenery and rural traditional culture conservation, function of maintenance and development of local society, and function of food security). The results of application method in elementary school showed that the textbook of the second-year class having a large amount of figures pictures related to agriculture and rural community, had the highest frequency in all six grades. In the function view, the environment preservation function was most abundant among a variety of multi-functionalities. In middle school, the average frequency had shown a rapid decrease. However, the function of environment preservation in the function view and the texts by application method were most frequent. in the first-year class. In high school, however, any mention related to agriculture and rural community was not made, in spite of the fact that the ten parts of textbook contained a lot of contents with a reasonable level. Based on the results of content analysis, findings and recommendations by part in textbooks for elementary school, middle school and high school have been drawn, and several examples for the content development to be included in the textbooks were listed.

• 한국해양공학회지
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• 제12권1호
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• pp.135-142
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• 1998

In this study, the frequency transfer function of motions are predicted from the result of a full-scale seakeeping trials. Because the real sea has the characteristics of multi-directional waves,we compare the results in the one directional waves with ones in the directional waves. For calculation of the frequency transfer function in the directional waves, Takezawa's inverse estimation method was introduced and the frequency ranges were divided into three parts in order to consider following seas. The full-scale seakeeping trials was executed in the south sea of Korea using the stern trawler. Those results show that analysis method of the multi-directional waves is more reliable than that of one directional waves, and confirm the possibility of applying this method to the full-scale seakeeping trials.

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 1998년도 The Third Asian Fuzzy Systems Symposium
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• pp.194-198
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• 1998

A novel fuzzy basis function vector- based adaptive control approach for Multi-input and Multi-output(MIMO) system is presented in this paper, in which the nonlinear plants is first linearised, the fuzzy basis function vector is then introduced to adaptively learn the upper bound of the system uncertainty vector, and its output is used as the paramenters of the compensator in the sense that both the robustness and the asymptotic error convergence can be obtained for the closed loop nonlinear control system.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 제40회 하계학술대회
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• pp.127_128
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• 2009

A new technique using a search method which is based on fuzzy multi-criteria function is proposed for GMS(generator maintenance scheduling) in order to consider multi-objective function. Not only minimization of probabilistic production cost but also maximization of system reliability level are considered for fuzzy multi-criteria function. To obtain an optimal solution for generator maintenance scheduling under fuzzy environment, fuzzy multi-criteria relaxation method(fuzzy search method) is used. The practicality and effectiveness of the proposed approach are demonstrated by simulation studies for a real size power system model in Korea in 2010.

• 한국소음진동공학회논문집
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• 제17권8호
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• pp.741-746
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• 2007

In this study, transfer path identification and output estimation are simulated by multi-dimension spectral analysis method (MDSA). Multi -input/single-output system give expression the vehicle suspension which each inputs are correlated reciprocally. In case of correlating with inputs, the system needs separating the each input signal by MDSA. Main simulations are about finding effective input by coherent output spectrum and selecting optimal input's number by multiple coherence function. Also, by shielding transfer path of each input, transfer path characteristic is identified in terms of overall integrated contribution level.