• 전기의세계
• /
• v.29 no.12
• /
• pp.798-803
• /
• 1980

A computer program for noise analysis of the audio circuit is developed. The application of the program to the equalizer, low frequency amplifier of radio circuit and cascaded amplifier show good results. The general noise analysis method for cascade operational amplifier is presented. The noise spectral power density is calculated for a resonator active filter.

• Proceedings of the Korean Operations and Management Science Society Conference
• /
• 1993.04a
• /
• pp.495-502
• /
• 1993

제품의 원가계산은 매우 복잡하고 어려운 작업으로 인식되어 왔으나 본 원가관리시스템을 이용하면 원가계산을 체계적이고 신속하게 계산.관리할 수 있다. 표준원가와 원가 시뮬레이숀의 경우는 기초정보만을 이용하여 계산함으로 기초정보만 준비되어 있으면 적용상의 문제는 전혀 발생되지 않는다. 실제원가의 경우에는 원가와 관련된 실적정보가 필요하므로 기존의 생산관리시스템과 연계하여야 사용이 가능하다. 원가차이분석 서브 모듈을 이용하면 원가분석을 용이하게 할 수 있다. 본 시스템의 특징은 원가계산시 원가적상법을 이용함으로서 제품의 원가를 계산할 때 모든 하위부품의 원가도 동시에 계산됨으로서 부품의 원가관리도 가능하다는데 있다. 또한 PC용으로 작성함으로서 시스템 도입시의 도입비용을 절감할 수 있다.

• Journal of Biomedical Engineering Research
• /
• v.11 no.1
• /
• pp.25-30
• /
• 1990

In this paper a new approximation method is presented for the nonminimum phase problem of LQG/LTR. Theoretical analysis and simulation results show that it can be better approximated than Stein's method.

• 전기의세계
• /
• v.29 no.3
• /
• pp.137-144
• /
• 1980

동기기의 현재의 지상과제는 그 첫째가 단위기용량의 증대에 있는데 현재의 추정으로서는 그 용량이 300MVA가 현기술상의 한계점이 될 것이며 그 이상이 되면 계기적 새로운 기술, 예를 들어 초전도도체 사용등의 기술이 개발되어야 할 것으로 믿어지는 바이다. 또 현재 대형기설계에 있어서는 유한요소법이 많이 적용되어 성과를 거두고 있음을 알 수가 있다. 그리고 전력전자공학, 전자공학의 발달이 동기기의 운전이나 그의 특성해석에 활용되고 있음을 알 수 있었고 앞으로의 과도특성해석을 위해서 더 정밀한 해를 얻을 수 있는 시뮬레이숀 프로그램이 많이 개발되어야 하겠고 또 시스템의 복잡화에 따라 기계에 미치는 영향을 복잡한 전기기계의 해석방법 방향에 의해서 해결해야 한다고 볼 수 있다.

• Journal of the Korean Institute of Telematics and Electronics
• /
• v.19 no.3
• /
• pp.28-36
• /
• 1982

Petri nets have been used for medeling a wide variety of systems from computer to social systems. This paper disusses Petri nets in the context of mathematical representation and its associated bag theory. The method of modeling systems such as event-condition, computer progranm computer operation and PERT chart is discribed and their Petri net representation are presented. Finally Petri net representation of tunnel diode oscillator circuit and the analysis of the circuit using Petri net are discussed with the program and results.

• The Transactions of the Korean Institute of Electrical Engineers
• /
• v.32 no.10
• /
• pp.367-375
• /
• 1983

An extended Kalman filter (EKF) algorithm for estimating aerodynamic parameters from missile flight data is evaluated using simulated test data. The algorithm includes a general purpose 6-DOF missile airframe suitable for representing a variety of missile configurations. The EKF is demonstrated to be well suited as a postflight analysis tool for extracting large numbers of airframe parameters from flight test measurements. A structure identification algorithm is evaluated using synthetic measurement data. This algorithm used in conjunction with the parameter identification algorithm, can select that model from a family of candidate models which most likely produced the synthetic measurement data.

• Journal of Energy Engineering
• /
• v.4 no.1
• /
• pp.52-58
• /
• 1995

석탄가스화 복합발전 플랜트의 시스템설계를 위한 engineering package의 체계 및 방법론에 대해 소개하였다. Engineering package는 플랜트 전체 개념설계 과정과 주요 공정을 구성하는 요소에 대한 설계/해석/시험 과정으로 나누어 진다. 개념설계과정은 설계목적과 제한조건을 충족시키도록 플랜트구성 설계, 정적/동적 시뮬레이숀, 요소별 설계사양 결정 및 Data Base Management System으로 이루어지며, 개념설계 과정의 한부분인 주요요소의 설계는 1차원 성능해석, 2/3차원 열유체해석 및 실험 그리고 구조, 진동 해석 등으로 구성되는 반복적 과정이다. 그러므로, 본 연구에서는 이러한 설계체계들의 개발전략을 설명하고, 현재 이루어진 추진결과에 대해 설명하였다.

• Journal of the Korean Geotechnical Society
• /
• v.19 no.6
• /
• pp.181-187
• /
• 2003

This paper describes a study of the influence of shield tunnel construction on the displacements and stresses induced in the linings of existing nearby parallel tunnels. The paper presents a brief review of a set of laboratory scale model research programme investigating the influence of tunnel proximity and alignment, liner stiffness on the nature of the interactions between closely spaced tunnels in clay. A total of two sets of carefully controlled physical model tests were performed. A cylindrical test tank was developed and used to produce clay samples of Speswhite kaolin. In each of the tests, three model tunnels were installed in order to conduct two interaction exts that have been carried out to investigate the interaction problem between parallel tunnels. The results of these tests are compared with the results of finite element analysis to investigate the techniques that must be used to obtain reliable numerical solutions to this type of problem.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.14 no.2
• /
• pp.137-145
• /
• 1989

In this paper we consider the design of bent sequence generators employing a modified bent function. Through the experimental results and simulation, we show that the period of sequences is $2^n$-1, the number of sequences in the set is $2n/2$, the largest magnitude of correlation is $2n/2$+1, and the sequence generators easy to randomly initialize into any assigned code and hence can be rapidly hopped from sequence to sequence. And we construct a code synchronization system with bent sequence generator as the local code generator, a sliding correlator and DLL as the acquisition subsystem and the tracking subsystem, respectively for DS-CODA, and verify the experimenta results for accomplishing code synchronism.

• Proceedings of the Korea Water Resources Association Conference
• /
• 1987.07a
• /
• pp.159-168
• /
• 1987

Temporal and spatial prediction of water quality provides the necessary information to a profect planning, design, and model optimization for water quality mangement in a river system. In thes study, the QUAL II model is applied to the Keum River system from the downstream of Dae-Chong dam to the Great Pak-Je bridge. The advection-dispersion model of water quality based on the material balance and the numerical solution method of the model are presented. The enhancement of the model application is empha sized by comparing the observed and the simulated values of BOD, DO, and water temperature. Through these processes, the water quality states of the Keum River system are evaluated and the deoxignation rate, the reaeration rate, and Fair value are estimated. Also, the maintance of the target DO level with the control of the discharge from Dae-Chong dam is discussed.