• The Journal of the Korea Contents Association
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• v.11 no.3
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• pp.48-55
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• 2011

In this paper, we analyze the input-output characteristics of fuzzy inference systems according to the division of entire input spaces and the fuzzy reasoning methods to identify the fuzzy model for nonlinear process. And fuzzy model is expressed by identifying the structure and parameters of the system by means of input variables, fuzzy partition of input spaces, and consequence polynomial functions. In the premise part of the rules Min-Max method using the minimum and maximum values of input data set and C-Means clustering algorithm forming input data into the hard clusters are used for identification of fuzzy model and membership function is used as a series of triangular membership function. In the consequence part of the rules fuzzy reasoning is conducted by two types of inferences. The identification of the consequence parameters, namely polynomial coefficients, of the rules are carried out by the standard least square method. And lastly, we use gas furnace process which is widely used in nonlinear process and we evaluate the performance for this nonlinear process.

• International Journal of Highway Engineering
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• v.8 no.4 s.30
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• pp.159-179
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• 2006

By using the current road design method that is based on the regulation about structure and facilities standard of the road and the route plan guide of a national road and the alignment optimization road design method which is studied in the inside and outside of country, this study operate the route plan of the sample study and compare and analysis the route character, consequently the current design method has local optimization that is formed the plan by the stage and the section. Alignment optimization road design has the system optimal route search. But cost function has limite that caused by construction parameter that is not included in cost function. So we design a road route included cost function in main fields. As a result, we obtain a realistic and economically road route. The alignment optimization road design model has to be made up some problems, like the change of vertical gradient in the tunnel section, though this defects it has a lot of merits as a geometric design tool, especially in the feasibility study and the scheme design.

• Computational Structural Engineering
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• v.8 no.2
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• pp.153-161
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• 1995

The dynamic instability for snapping phenomena has been studied by many researchers. There is few paper which deal with the dynamic buckling under the load with periodic characteristics, and the behavior under periodic excitation is expected the different behavior against step excitation. In this study, the dynamic direct snapping of shallow elliptic paraboloidal shells is investigated under not only step excitation but also sinusoidal and seismic excitations, applied in the up-and-down direction. The dynamic nonlinear responses are obtained by the numerical integration of the geometrically nonlinear equations of motion, and examined by the Fourier spectral analysis in order to get the frequency-dependent characteristics of the dynamic instability for various load levels. The results show that the dynamic instability phenomenon carried out from stable to unstable region reveals considerably different mechanism depending on the characteristics of excitations.

• The Korean Journal of Financial Management
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• v.11 no.2
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• pp.161-173
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• 1994

유상증자의 주가하락에 대하여 유상증자 공시일전 내부자순매수를 종속변수로 설정하여 선형회귀분석한 결과, 이전의 논문결과와는 달리 유상증자규모효와 자본구조변화효과는 보이지 않았으며, 반면에 유상증자의 주가하락이 내부자순매수와 통계적 유의성이 높은 비례관계가 있음을 밝혀 내었다. 이 결과는 유상증자규모효과로 인한 가격 압박가설과 자본구조변화효과로 인한 부의 이전가설을 기각시키고 정보전달가설이 유상증자의 주식 가격 하락현상을 설명하는 설득력 있는 가설임을 시사하고 있다.

• Proceedings of the Korean Information Science Society Conference
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• 2003.10b
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• pp.820-822
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• 2003

접미사 배열이나 접미사 트리는 대용량의 서열데이터를 효율적으로 검색, 저장할 수 있는 인덱스 자료구조로서 바이오인포매틱스와 같이 대용량 데이터의 처리. 분석이 필요한 분야에 이용될 수 있다. 최근 들어 접미사 배열에 대한 연구가 활발히 진행되어 접미사 배열의 효율적인 저장, 선형시간 생성 및 선형시간 탐색 알고리즘들이 개발되었다. 본 논문에서는 같은 전사인자가 결합할 것으로 예상되는 여러 개의 전사조절부위에 대한 DNA 서열들이 입력으로 주어졌을 때 전사인자가 결합하는 부위를 예측하는 방법을 제시한다. 이를 위해 최근에 제시된 선형시간 접미사 배열 생성 알고리즘을 이용하고 TRANSFAC과 EMBL 등의 DB를 이용하여 실험을 통해 본 논문에서 제시하는 방법의 정확도를 평가한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.25 no.9B
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• pp.1563-1569
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• 2000

Teager-Kaiser algorithm that can track the energy of tone signals with simple nonlinear operations, has been applied to detection of tone signals closely spaced in frequency. The performance of the previous detector depends upon the performance of internal filters. An improved scheme is proposed in this paper by employing the nonlinear energy trackers in cascade. The proposed detector is analytically designed and verified by computer simulation. It shows that the new detection scheme improves the detection performance while reducing the implementation complexity.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2007.11a
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• pp.300-300
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• 2007

최근 전기전자기기 및 광학기기 등의 소형화 및 고기능에 맞추어 구동 장치의 소형화가 필수적으로 요구됨에 따라, 보다 간단한 구조의 다양한 소형 압전 선형 모터에 대한 개발이 활발히 진행되고 있다. 본 연구에서는 굴곡 진동 모드를 갖는 평판형의 압전체와 탄성체로 구성된 압전 트랜스듀서와 두 개의 압전 트랜스듀서를 연결하여 타원 운동을 구현하기 위해, 굴곡 변형이 발생하는 한 쌍의 압전 트랜스듀서에 $90^{\circ}$ 위상차를 갖는 정현파를 각각 인가하여, 한 쌍의 압전 트랜스듀서를 연결하는 돌출부에서 타원궤적을 형성하는 소형 압전 액츄에이터를 설계하였다. 유한요소해석 프로그램인 ATILA를 이용하여 결합부의 타원 궤적의 형성하기 위한 압전 트랜스듀서의 최적 동작 주파수로 운동 모드를 결정하고자 한다.

• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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• 2010.06a
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• pp.28-31
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• 2010

본 연구는 대구시의 상업지역의 용도지역변화를 GIS를 사용하여 시대별로 구축하고 이를 분석함으로써 변화의 특성을 고찰함에 그 목적이 있다. 연구의 방법은 도심기능의 분산과 그에 따른 상업지역을 중심으로 한 용도지역의 변화형태 그리고 상업시설의 입지형태를 분석하였다. 이에 따라 분석한 결과 상업지역의 입지에 따른 주변지역의 용도 지역의 변화와 아울러 가로축의 발달과 함께 상업시설의 형태도 선형으로 발달하며 기능을 분산시키는 것을 알 수 있었다.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.28 no.1
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• pp.53-61
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• 2015

This paper presented the nonlinear behaviors of the single-layered lattice dome, which is widely used for the long-span structure system. The behaviors were analysed through the classical shell buckling theory as the single-layered lattice dome behaves like continum thin shell due to its geometric characteristics, and finite element analysis method using the software program Nastran. Shell buckling theory provides two types of buckling loads, the global- and member buckling, and finite element analysis provides the ultimate load of geometric nonlinear analysis as well as the buckling load of Eigen value solution. Two types of models for the lattice dome were analysed, that is rigid- and pin-jointed structure. Buckling load using the shell buckling theory for each type of lattice dome, governed by the minimum value of global buckling or member buckling load, resulted better estimation than the buckling load with Eigen value analysis. And it is useful to predict the buckling pattern, that is global buckling or member buckling.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.24 no.1
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• pp.51-58
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• 2014

A LFSR is commonly used for various stream cryptography applications to generate random numbers. A Leap-ahead LFSR was presented to generate a multi-bits random number per cycle. It only requires a single LFSR and it has an advantages in hardware complexity. However, it suffers from the significant reduction of maximum period of the generated random numbers. This paper presents the new segmented Leap-ahead LFSR to solve this problem. It consists of two segmented LFSRs. We prove the efficiency of the proposed segmented architecture using the precise mathematical analysis. We also demonstrate the proposed comparison results with other counterparts using Xinilx Vertex5 FPGA. The proposed architecture can increase 2.5 times of the maximum period of generated random numbers compared to the typical Leap-ahead architecture.