• The Transactions of the Korean Institute of Electrical Engineers B
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• v.55 no.3
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• pp.123-130
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• 2006

This paper presents characteristics analysis of skewed Synchronous Reluctance Motor using equivalent magnetic circuit and compares with the result of Finite Element Method. Torque ripple must be reduced, because it is producing noise and vibration. There is many kinds of method to reduce torque ripple, but generally we apply skewing stator or rotor. The 2D Finite Element Method(FEM) or 3D FEM is used to analyze the motor, since skew influence the average torque in the motor. However, the FEM takes much time in spite of the advanced computer and numerical technique. This paper will analyze characteristics of skewed synchronous reluctance motor using equivalent magnetic circuit.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1999.05a
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• pp.278-281
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• 1999

We designed and fabricated a travelingwave CPW(coplanar waveguide) electrode for LiNbO$_3$ optical modulator. To Investigate the variation of microwave refractive index of these electrodes, we prepared the CPW electrode samples as a function of electrode thickness and measured the TDR and S-parameter. From this results, we could know the electrode conditions of index matching to 2.20 for 1150 nm optical wave index for applying LiNbO$_3$ optical modulator. Also we discussed the some properties of CPW electrode for applying LiNbO$_3$ optical modulator.

• Proceedings of the KIEE Conference
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• 2000.07d
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• pp.3109-3111
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• 2000

Recently. internet applications for efficient cyber education have drawn much interests. The world-wide web provides new opportunities for cyber education over the internet. This paper presents a virtual lab system which can be used on the world-wide web. The proposed virtual lab system provides the improved learning methods which can enhance the educational efficiency in electrical engineering experiments. If the students enter the virtual lab system on the web. they can make experiments on basic electrical and electronic principles through simple mouse manipulation. Since proposed virtual lab system is implemented to describe the actual lab system. the students can obtain similar experimental data through it. Several sample Java applets are illustrated as examples.

• Proceedings of the KIEE Conference
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• 2000.07d
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• pp.3189-3191
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• 2000

This paper is aimed to handle quick work for all the workers and to improve the productivity by adding more effective content in Crane Monitoring System. The contributing proportion of the increase of port productivity is more increasing concerning not only the port industry, but also all the informations of container crane which is the representative equipment by the rapid increase of the volume of freight of port. The basic of rapid service is the improvement of the productivity, the information of operation as to the productivity of crane for the quick handling within yard and especially the informations of breakdown and to handle breakdown as soon as possible has a great effect on the increase of productivity.

• Proceedings of the KIEE Conference
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• 2000.07d
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• pp.2723-2725
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• 2000

It is sometimes necessary to observe the working environment of a robot to control it in the remote location. The remote sensing data and control commands are transmitted via various media such as radio, microwave, and computer network. In this paper we propose an advanced technique of the remote control of mobile robots on the web. The image separation is included in the proposed algorithm to control mobile robots in the real-time. We transmit the positions of a mobile robot and obstacles instead of transmitting the full frame image. An experiment is performed to show the efficiency of the proposed algorithm.

• Proceedings of the KIEE Conference
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• 1998.11b
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• pp.689-692
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• 1998

In this research a fault-tolerant and bumpless switching control is proposed for boiler systems used in the power plants. Firstly, three operating points are selected to control the nonlinear boiler through the full operational range, and the $H_{\infty}$ loop shaping controller and the model-based predictive controller(MBPC) are designed. To prevent the windup and bump problems which are caused by the actuator saturation and the controller switching, an anti-windup and bump less transfer technique is adopted to the $H_{\infty}$ loop shaping controller. Also the constrained gain-scheduling technique is applied to MBPC to achieve the same objective. Secondly, the fault-tolerant control technique is proposed to continue the control action without stopping the boiler operation even in case of some faults. Through various simulation studies, the performances of the proposed control techniques are demonstrated.

• Genomics & Informatics
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• v.2 no.4
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• pp.167-173
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• 2004

The main mechanism of evolution is that biological entities change, are selected, and reproduce. We propose a different concept in terms of the main agent or atom of evolution: in the biological world, not an individual object, but its interactive network is the fundamental unit of evolution. The interaction network is composed of interaction pairs of information objects that have order information. This indicates a paradigm shift from 3D biological objects to an abstract network of information entities as the primary agent of evolution. It forces us to change our views about how organisms evolve and therefore the methods we use to analyze evolution.

• Journal of the Korean Institute of Intelligent Systems
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• v.13 no.5
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• pp.600-605
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• 2003

PCA(Principle Component Analysis) has emerged as a useful tool for process monitoring and fault diagnosis. The general approach requires the user to identify the root cause by interpreting the residual or principle components. This could be tedious and often impossible for a large process. In this paper, PCA scheme is combined with the FCM-based fault diagnostic algorithm to enhance the diagnostic results. The implementation of the FCM-based fault diagnostic system by using PCA is done and its application is illustrated on the two-tank system.

• Journal of Yeungnam Medical Science
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• v.19 no.2
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• pp.92-98
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• 2002

Emergency medicine(EM) is the specialty of evaluating, stabilizing and initiating treatment for patients with life or limb-threatening illnesses or injuries. Techniques unique to the specialty of EM are the triage systems, quick stabilization methods, and emergency surgery procedures. The field of EM encompasses areas such as emergency department management, disaster planning and management, the management of emergency medical service(EMS) systems, research into such areas as brain and heart resuscitation, trauma and disaster management, survival medicine, and environmental emergencies(cold and heat injuries, poisioning, decompression sickness and barotrauma). Today, in addition to providing emergency care, the emergency specialists have moral and legal obligations to assess and report probable cases of child and spouse abuse, sexual assault, and alcohol and drug abuse. Future, the EM should provide surveillance, identification, intervention, and evaluation of injury and disease, therefore EM will remain as a key component of evolving community health care system.

• Proceedings of the KSME Conference
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• 2004.04a
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• pp.542-546
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• 2004

Fully non-local Quasicontinuum method using sub-divided region with Hermite interpolation function is proposed for simulation of carbon nanotube. Tersoff-Brenner potential is adopted for interaction of bonded atoms and also van der Waals force for non-bonded interaction. Bending of single wall carbon nanotube with chirality (20,0) and 15nm length is simulated up to 90 degree. Bending of double wall carbon nanotube with chirality (20,0) and (12,0) is simulated up to 65 degree. Bending of four wall carbon nanotube is simulated up to 45 degree.