• Proceedings of the KIEE Conference
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• 1991.11a
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• pp.374-377
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• 1991

In this paper, it is proposed to improve the robustness of the Fast Recursive Least Squares(FRLS) algolithms with the exponential weighting, which is an important class of algolithms for adaptive filtering. It is well known that the FRLS algolithm is numerically unstable with exponential weighting factor ${\lambda}<1$. However, introducing some gains into this algolithms, numerical errors can be reduced. An accurately choice of the gains then leads to a numerically stable FRLS algolithm with a complexity of 8m multiplications and we shown it by computer simulations.

• The Transactions of the Korean Institute of Power Electronics
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• v.5 no.2
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• pp.115-122
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• 2000

In design of a digital current controller for a 3cP PWM converter, its conventional model is used in obtaining i its discretized version. But, it has errors since the characteristics of SVPWM and time delay are not taken i into consideration. In this paper, the new reference frame model of a 3c~ PWJVI converter is proposed C considering these problems. Also, the direct digital current controller based on this model is designed without a any extra algolithm. A simple tuning algorithm for the proposed current controller is given to compensate the i inductaηce mismatch problem. Then simulation and experimental results show the validity of the algolithm.

• Proceedings of the Acoustical Society of Korea Conference
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• 1991.06a
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• pp.28-31
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• 1991

In this paper, it is proposed to improve the robustness of the Fast Recursive Least Squarea(FRLS) algolithms with the exponential weighting, which is an important class of algolithms for adaptive filtering. It is well known that the FRLSalgolithm is numerically unstable with exponential weighting factor λ<1. However, introducing some gains into this algolithms, numerical errors can be reduced. An accurately choice of thegains then leads to a numerically stable FRLS algolithm with a complexity of 8m mulitiplications and we shown it by computer simulations.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.19 no.1
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• pp.101-107
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• 2010

This paper presents motion control of the precision stage composed of the piezoelectric actuator and flexible hinges. The stage shows approximately 27% overshoot when the stage was applied to 30V square wave input voltage. Also, the stage shows nonlinear response characteristics including hysteresis. This paper proposes feedback control technique to suppress the phenomenon of hysteresis and overshoot using the sliding mode control scheme with the integrator. Also, this paper suggests the method that searches important parameters of sliding mode control and observer using Genetic Algorithm. To demonstrate the effectiveness of the proposed control algorithm, experimental validations are performed.

• Proceedings of the Korean Society of Computer Information Conference
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• 2013.07a
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• pp.233-234
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• 2013

본 논문에서는 전자해도 응용 서비스를 위한 SENC 자료구조의 설계를 제안한다. SENC란 System Electonic Navigational Chart의 약어이며 전자해도 시스템이라고 부른다. 전자해도 시스템의 배포 형식은 전자해도 데이터를 전자해도 시스템으로 운용하는 시스템 환경에 맞게 재구성한 SENC 데이터로 저장, 관리한다. SENC를 구성하기 위해선 방대한 양의 전자해도 데이터가 필요하고 이 많은 데이터들을 저장, 관리, 검색할 수 있는 알고리즘이 필요하다. 전자해도 시스템을 효율적으로 관리하기 위한 알고리즘들을 설계하고 이 알고리즘을 이용한 간단한 구현화면을 제작하였다.

• Transactions of the Korean Society of Mechanical Engineers
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• v.18 no.9
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• pp.2349-2357
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• 1994

This paper presents a facial expression transformation algorithm and drawing rule generation algolithm for a portrait drawing robot which was developed for the '93 Taejeon EXPO. The developed algorithm was mainly focused on the robust automatic generation of robot programs with the consideration that the drawing robot should work without any limitation of the age, sex or race for the persons. In order to give more demonstratin effects, the facial expression change of the pictured person was performed.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.18 no.3
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• pp.287-294
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• 2000

The present paper describes an investigation into the application of the artificial neural network in the establishment criterion of redevelopment assignment. From the results, it is found that the artificial neural network algolithm search technique is very effective to find the good optimum solution as well as has higher robustness. So, the results of this research could contribute to making a reasonable assessment criterion of redevelopment assignment which is proper to the situation of Korea.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.17 no.1
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• pp.74-79
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• 2003

In this paper, the PID controller is constructed with a neural network and wavelet function. And the wavelet neural PID controller is adapted by choosing the values of the dilation and translation parameter of the wavelet function. Weights are adjusted by the inverse propagation algolithm. Applying this method to the position control system, its usefulness is verified from the results of experiment.

• The Journal of the Korea institute of electronic communication sciences
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• v.8 no.1
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• pp.27-40
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• 2013

This study is about development of technology system for an advanced deep-sea unmanned underwater robot of S. Korea analysed by the application of scenario planning. It was developed a 6000m class next-generation deep-sea unmanned underwater vehicle(or robot, UUV) system, soonly ROV 'Hemire' and Depressor 'Henuvy' in 2006 at S. Korea and motion control, adaptive control algolithm, a work-space manipulator control algolithm, especially the underwater inertial-acoustic navigation system robust to initial errors and sensor failures. But there are remained matters on position tracking of the USBL, inertial-acoustic navigation system, attitude sensor, designed sonar sensors. So this study suggest the new idea for settle the matters and then this idea help the development of the underwater inertial-acoustic navigation system robust to initial errors and sensor failures, such as acoustic signal drop-out, by modifying the error covariance of the failed sonar signal when drop-out occurs. As a result, the future policy for deep-sea unmanned underwater robot of S. Korea is to further spur the development of new technology and more improvement of the technology level for deep-sea unmanned underwater robot system with indicator and imaginary wall as external device.

• Journal of Korean Society of Transportation
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• v.17 no.5
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• pp.69-78
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• 1999

This paper defines the reliable based route choice Principle and formulates the reliability based equilibrium traffic assignment using the Principle. The reliability is defined as the difference of travel demand and capacity using the interference theory of the system engineering. An efficient solution a1gorithm based on Frank-Wo1fe algolithm is Presented to calculate and compare the reliability based traffic assignment with conventional travel time based assignment using small and large scaled road networks. The results show that reliability based traffic assignment converges to equilibrium solution in a reasonable computing time. The equilibrium link flows between reliability and travel time based traffic assignment differ each other in the sense that reliability based assignment is assigned based on the maximum difference of travel demand and link capacity whilst travel time based is assigned on the shortest travel time.