• Proceedings of the IEEK Conference
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• 1998.06a
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• pp.542-545
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• 1998

This paper presents a new reference voltage generator(RVG) for advanced DRAM's. The proposed RVG with three temperature coefficient is independent of temperature variation, and supply voltage. This is used to shorten leakage current using the boosted sense ground(BSG). This circuit is designed in a 0.8.mu.m nwell CMOS, double-polysilicon, double-metal technology. The simulation resutls in jindependent temperature and supply voltage. In hspice simulation results, temperature dependency of RVG is 130.mu.V/.deg. C and supply voltage dependency is .+-.0.91%, $V_{cc}$ =3.3V.+-. 0.5V.3.3V.+-. 0.5V.

• Proceedings of the IEEK Conference
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• 2008.06a
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• pp.593-594
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• 2008

In this article, process voltage temperature (PVT) compensated on-chip oscillator is implemented by using proportional to absolute temperature (PTAT) circuit and process compensator. Process compensator circuit based on current subtracter and PTAT circuit are proposed for compensation of oscillation frequency to cope with process variation and temperature variation. All circuit can operate in the range of $3.5{\sim}5\;V$ supply voltage. It can be applied to PVT insensitive low frequency clock reference generator.

• Speech Sciences
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• v.7 no.1
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• pp.53-64
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• 2000

Theoretically, alaryngeal speakers have difficulty in accomplishing the production of voiceless consonants. However, the perceptual studies often reveal a clear production of voiceless consonants giving good articulation scores in skilled alaryngeal speakers. The purpose of the present study was to clarify the production of voiceless stops in mode of articulation to normal speakers and skilled alaryngeal speakers. The acoustic characteristics of alaryngeal speech compared to the normal speech were investigated with special reference to the voiceless stop consonants. The surface electromyography from neck is used to monitor pharyngeal activity during speech. The general result is. that esophageal, shunt and neoglottal speakers realize the distinctions between the three types of [p] in a manner parallel to normals, whereas those using an electric voice generator do not.

• Journal of the Ergonomics Society of Korea
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• v.17 no.1
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• pp.11-22
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• 1998

When grasping a movable object or making an object move, humans feel kinesthetic sense. The kinesthetic sense is the human sense that the human feels in response to the motion acted on him. The objective of the paper is to transform the kinesthetic sense associated with the human arm into the quantified data that are useful from the engineering viewpoint. A 2-dimensional motion generator composed of two linear motors was developed to provide various motion patterns. It can change its stiffness and damping values on the real-time basis by properly regulating the force generated by the linear motors. Based on Taguchi method, the most dominant factors to affect the kinesthetic sense were investigated. Also, a reference function adequate to quantify the kinesthetic sense was found. Based on this function, the effects of changes in stiffness and damping on the kinesthetic sense were investigated. Various tests show that the damping is a more dominant factor than the stiffness in forming the kinesthetic sense.

• Proceedings of the IEEK Conference
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• 2003.07e
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• pp.2200-2203
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• 2003

In an active noise control(ANC) system using the Filtered-X least mean square(LMS) algorithm, the online secondary path modeling method by exploiting a random noise generator is applied. This method is suitable for secondary path modeling. However, it is increased the residual error of the ANC system. In this paper, we presents an ANC system improved online secondary path modeling method which is modified Kuo and Zhang model that is the secondary path estimation by the additive noise. In addition, our proposed model is used that additive noise is transformed into the signal multiplied reference signal by gain control parameter and delayed.

• Proceedings of the KIEE Conference
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• 2006.04a
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• pp.336-338
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• 2006

One of the important topics concerning the safety of electrical and electronic system is the reliability of the wiring system. The Time-Frequency Domain Reflectometry(TFDR) is a state-of-the-art system for detection and estimation of the fault on a wiring/cable. The purpose of this paper is to implement a Labview based TFDR Real Time system though the instruments of PCI extensions for Instrumentation(PXI). The TFDR Real Time system consists of the five parts: Reference signal design, signal generation, signal acquisition, algorithm execution, results diplay part. In the signal generation and acquisition parts we adopt the Arbitrary Waveform Generator(AWG) and Digital Storage Oscilloscope(DSO) PXI modules which offer commonality, compatibility and easy integration at low cost. And execution of the PXI modules not only is controlled by the Labview programing but also the total system process is executed by the Labview application software.

• Proceedings of the KIEE Conference
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• 2004.04a
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• pp.27-29
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• 2004

In this paper, a levitation control circuit for a magnetic levitation system supplied with a battery is designed. The control circuit consists of DSP, 4-quadrant chopper, and gap sensor as feedback sensors. Moreover the DSP includes PWM generator, A/D converter, etc. The feedback signals from gap sensors go into A/D converter of DSP to compare with reference. As a result, The design procedures of the levitation control circuit and battery power distribution system are described and basic experiment results are shown.

• The Transactions of the Korean Institute of Electrical Engineers
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• v.36 no.4
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• pp.267-272
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• 1987

In this paper, field oriented control is applied to a 16 bit micro-processor Mc68000 controlled CSI fed induction motor servo drive. The control of induction motor using the principle of its is able to have the transient performance nearly to that of DC motors in the position control. The software and hardware for the Mc68000 is developed. The position control scheme consists of the field oriented control loop and te speed reference pattern generator. The digital computer simlation and experimental results are provided, close agreement between them is obtained.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.24 no.1
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• pp.30-35
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• 1988

An electrical power generation system driven by main engine shaft, briefly SG system for middle or small size fishing boat is studied experimently. In the SG system, power transmission is performed by a variable displacement hydraulic pump driven by the main engine and a constant displacement hydraulic motor. It was verified that the SG system enabled the generation of electrical power with constant frequency regardless main engine speed. In the SG system, setting reference frequency, sensing generator output frequency and setting controller parameters are performed by performed by programming in a microcomputer, so a countermeasure for physical situations of control object is very easy. Futhermore, the SG system has following features; low initial installation cost, wide freedom of installation in engine room, advantage of application in existing ships, especially fishing boat with hydraulic fishing equipments.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.8 no.6
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• pp.2005-2021
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• 2014

This paper proposes a novel image authentication scheme, aiming at tampering detection for block truncation coding (BTC) compressed image. The authentication code is generated by using the random number generator with a seed, and the size of the authentication code is based on the user's requirement, with each BTC-compressed image block being used to carry the authentication code using the data hiding method. In the proposed scheme, to obtain a high-quality embedded image, a reference table is used when the authentication code is embedded. The experimental results demonstrate that the proposed scheme achieves high-quality embedded images and guarantees the capability of tamper detection.