• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.9 no.4
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• pp.103-110
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• 1995

Fuzzy theory is recently finding wide popularity in various applications that include management, economics, medicine and process control system. This paper describes application of fuzzy logic in a current control system that use a inverter welding machine. The Fuzzy control is then extended to the current loop control, replacing the conventional proportional-integral(PI) control methods. The fuzzy control algorithms have been developed in detail and verified by experiments of a inverter welding system. The experimentation study indicates the superiority of fuzzy control over the I control methods. Fuzzy control seems to have a lot of promise in the applications of welding process control system.

• MALSORI
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• no.50
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• pp.99-110
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• 2004

The normal transmission characteristics of sound are hardly obtained due to the various noises and structural factors in a running car environment. It is due to the channel distortion of the original source sound recorded by microphones, and it seriously degrades the performance of the speech recognition in real driving environments. In this paper we analyze the degree of intelligibility under the various sound distortion environments by channels according to driving speed with respect to speech transmission index(STI) and compare the STI with rates of speech recognition. We examine the correlation between measures of intelligibility depending on sound pick-up patterns and performance in speech recognition. Thereby we consider the optimal location of a microphone in single channel environment. In experimentation we find that high correlation is obtained between STI and rates of speech recognition.

• The Transactions of the Korea Information Processing Society
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• v.5 no.11
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• pp.2809-2822
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• 1998

GNARL is the runtime system of the Gun NYU Ada'95 compiler(GNAT). It implements the multi-tasking features of the Ada programming language and together they provide a freely available test-bed for experimentation in language, compiler, and runtime support for real-time programming. In this paper, we give an overview of GNAT and GNARL. We then describe the results of our research toward improving efficiency, predictability, and reliability of Ada'95 multi-tasking.

• Proceedings of the KSR Conference
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• 2011.05a
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• pp.660-665
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• 2011

In this paper we investigated a variety of candidate trains in KORAIL and Seoul Metro Corp. for an experimental driving which would be in the prosecution of making functional and performance experimentation for the specified manual by this project. We examined many preliminary out-of-service trains and some kinds of spare trains to secure two composition of test-trains for CBTC evaluation and studied a remaking scheme to convert control vehicles of these trains to CBTC-functioned ones to choose a most suitable ones of them, so we will be make traveling tests on the test railroad with them.

• Smart Structures and Systems
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• v.8 no.4
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• pp.367-384
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• 2011

This paper presents the design and experimental evaluation of fast output sampling feedback controller to minimize structural vibration of a cantilever beam using Shape Memory Alloy (SMA) wires as control actuators and piezoceramics as sensor and disturbance actuator. Linear dynamic models of the smart cantilever beam are obtained using online recursive least square parameter estimation. A digital control system that consists of $Simulink^{TM}$ modeling software and dSPACE DS1104 controller board is used for identification and control. The effectiveness of the controller is shown through simulation and experimentation by exciting the structure at resonance.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.61 no.2
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• pp.209-215
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• 2012

This paper deals with a reduction of cogging torque and estimate of inductance for IPMSM. The flux barriers(Barrier) and the auxiliary slot(Notch) for the reduction of cogging torque was installed for increase of driving characteristic in IPMSM. The cogging torque, driving torque and inductance are analyzed by using FEM(Finite Element Method) and the results of inductance calculation are compared to experimentation ones.

• Journal of the Institute of Convergence Signal Processing
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• v.14 no.2
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• pp.90-94
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• 2013

Research for Manchu character digitalization is at an early stage. This paper proposes a preprocessing algorithm for Manchu character recognition. This algorithm improves the existing Hilditch thinning algorithm so that it corrects thinning error for Manchu characters. The existing algorithm separates the characters into the left-hand side and right-hand side, while our alogorithm uses the central point between the points that strokes exist when it classifies each of characters. The experimentation results show that this method is valid for thinning and classification of Manchu characters.

• Journal of the Korean Society for Nondestructive Testing
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• v.5 no.2
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• pp.5-11
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• 1986

In recent years the acoustic emission technique has been increasingly applied for detecting flaw s and cracks in materials either under testing or in service. It is important that what is the origin of AE signals detected by AE transducers. The purpose of this paper is to detect AE source on ductile material such as pressure vessel steel, A533B. As the results of experimentation, the increase of AE events number is proportional to the increase of the volume of plain strain zone. The origin of AE signals is fracture of MnS inclusions which have small amplitude of AE waves.

• Proceedings of the Korea Concrete Institute Conference
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• 2002.10a
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• pp.457-462
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• 2002

Generally speaking, durability, load carrying capacity and the life of structure becomes to be shortened in all structures as time passed. Also, we have to repair and reinforce because of tile decrease of the traffic volume and overloaded vehicles in the bridge. External prestressing method is most popular and effective strengthening method which can be used for the prestressed concrete-girders. When strengthening with external prestressing method, there are many ways to install anchorage system. But, These methods have many faults. For example, the achorage force is so small or an anchorage system installation damages an existing structure. So, this paper suggested a new anchorage system to strengthen without any damage to the structure and then confirm the increase of durability and the properties of behavior with experimentation.

• 제어로봇시스템학회:학술대회논문집
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• 2003.10a
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• pp.2072-2077
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• 2003

Animal-like robots are serving an important role as a linkage between biology and engineering. So, in this paper, we aim to develop a biomimetic microrobot that mimics the locomotion mechanism of a gastropod. This microrobot has 3 DOF (x, y translation and rotation), and has small size, unlimited traveling range, high resolution and low cost. Its movement can be made using propagation wave that is generated by the controllable sinusoidal voltage source and piezoelectric effects. This soft motion that can be generated by propagation wave and piezoelectric mechanism would be useful for the motion on the slippery surface. So we modeled the propagation wave mechanism including piezoelectric effect and friction on the contact surface, and could know the velocity of the microrobot is dependent on the driving frequency, input voltage peak, propagation wavelength and surface friction coefficient. With these results we design the microrobot, and accomplish its fabrication and experimentation. The development of this microrobot shall be aimed to design an autonomous moving actuator like animal. Also it can be used from micromanipulation system technology to biology and medicine.