• 한국정보디스플레이학회:학술대회논문집
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• 2002.08a
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• pp.795-798
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• 2002

Replacing Pb-free glass composition for the dielectric materials is expected in PDP industry. In this study, phosphate glasses, $P_2O_5$- ZnO- SnO (PZS), $P_2O_5$-ZnO-BaO (PZB) were selected for a new transparent dielectric. Thermal properties (Tg, CTE) were measured with differential thermal analyzer and thermal mechanical analyzer. The glass transition of the glasses was ranged at $365{\sim}405^{\circ}C$ for the PZS system and $5.9{\sim}9.5{\times}\;10^{-6}$ of thermal expansion were found. The PZB system showed $445{\sim}470^{\circ}C$ of glass transition. Thus, the glass compositions would be a potential candidate for a transparent dielectric layer in plasma display panel.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2005.04a
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• pp.36-41
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• 2005

복소유전율상수인 실수부(Real part)와 허수부(Imaginary part)를 측정하기 위하여 Frequency Domain Reflectometry with Vector Network Analyzer(FDR-V) 측정 장비로 $1{\sim}18GHz$ 범위 내에서 매질의 기본 구성단위인 공기, 물, 흙입자에 대한 기본적인 유전율 특성을 파악하고, 이들로부터 다공질 매질내 유류 오염물질의 함유 특성을 측정할 수 있다. 또한 제작된 시료에 대한 포화도와 1GHz 범위에 분포하는 실수부 유전율상수와의 관계로부터 매질의 공극내 함유된 물질의 유전율상수 특성에 매우 민감한 반응을 보이므로, 이들로부터 매질의 공극률 내지 유효공극률의 측정이 가능할 것으로 사료된다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.12 no.3
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• pp.224-238
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• 1987

In the proposed spectrum analyzer, open-loop VCO is replaced with PLL synthesizer incorporating digital frequency synthesizer using modulofunction for measuring precise frequencys. Three different frequency bands and channel spacings are realized by single loop synthesizer through the effective design of the system. The newly designed system with square detection has a good linearity of input range from 10mV to 8.5V, as a result the input sensitivity has been improved up to 500uV. The storage function enables us to analyze not only periodic but also nonperiodic wave-form and zoom-in function expands frequency resolution eight times for the dense spectra.

• Proceedings of the KIEE Conference
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• 1999.07e
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• pp.2450-2452
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• 1999

Presently, it is now developing the optical remote gas sensor system which can measure combustible gases such as $CH_4$ and $C_2H_2$ generating by partial discharges inside the cable and connection parts to detect thermal deterioration of Oil-Filled (OF) power cable at the appropriate time. It is the most important parameter to select central wavelength of laser diode (LD) by analyzing the absorption bend of measuring gases in the infrared region. In this research, we proposed the optical spectrum analyzer to absorption band of $CH_4$ and $C_2H_2$ for the preliminary research of optical fiber gas detecting system.

• Genomics & Informatics
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• v.2 no.2
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• pp.107-109
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• 2004

HapAnalyzer is an analysis system that provides minimum analysis methods for the SNP-based association studies. It consists of Hardy-Weinberg equilibrium (HWE) test, linkage disequilibrium (LD) computation, haplotype reconstruction, and SNP (or haplotype)-phenotype association assessment. It is well suited to a case-control association study for the unrelated population.

• Journal of Sensor Science and Technology
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• v.20 no.4
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• pp.243-248
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• 2011

The purpose of this study is to develop a sensing system to measure the capacitance of a pre-developed engine oil deterioration detection sensor integrated with an oil filter. To measure the capacitance of engine oil in the sensor, it is used the way measuring the electric charging time in a capacitor by impressing DC volt. This method has merits on cost and signal stability. The measured capacitance is compensated by comparison with the one measured by an impedance analyzer. Also, using the dielectric constant gained by an impedance analyzer, the calculating equation of the dielectric constant of engine oil related with the currently developed sensor is decided. Finally, the degradation degree of engine oil is estimated according to the change rate of dielectric constant between green oil and used oil. The newly developed personal controller is to control a series of the processes.

• Proceedings of the Korean Vacuum Society Conference
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• 2013.08a
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• pp.104.2-104.2
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• 2013

A residual gas analyzer (RGA) system has been developed in this laboratory. Characteristics of the RGA system parts such as ion source, quadrupole mass filter and sensitivity are introduced. Some efforts have been made to improve performance of the two types of ion sources, open ion source (OIS) and closed ion source (CIS). A metal mesh was placed onto the electron beam entrance of the CIS anode tube to block the filament field penetration. Sensitivity of the CIS ion sources with and without the mesh was compared by mass spectra of SF6 gas (97% He base) introduced into the CIS anode through a needle valve. About ten-times improvement in the RGA sensitivity was observed for the CIS with the mesh in the electron entrance. Computer simulation showed an axi-symmetric anode potential distribution and improved focusing of the electron beam inside the anode tube with the mesh.

• Journal of the Korean Institute of Telematics and Electronics
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• v.23 no.6
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• pp.908-915
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• 1986

In this paper, an English-Korean machine translation system which consists of a syntax analyzer, a semartic analyzer and a sentence generatodr is proposed. The intermediate language in the syntax analysis is described by a lambda categorial grammar that is based on Montague Grammar, and the augmented context free grammar is introduced in the description of object language. Much difficulty in constructing general rules and semantic representations of an object language in the parser can be avoided by using the knowledge from the user interface utility that can modify the contents of dictionary and grammar rules.

• The Journal of the Society of Stroke on Korean Medicine
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• v.14 no.1
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• pp.23-30
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• 2013

■ Objectives This study is to examine change of gait parameters on shoes sole height(high heels, MBT shoes, house shoes) through gait analyzer. ■ Methods The subjects of this study were 12 women in their twenties. Gait analysis system is 5m in total length and gait is led to be comfortable. They put three kinds of shoes each and were led to walk 5m on gait analysis system. ■ Results There were significant differences in step length, single support and load response of gait parameters and in stride length and total double support at double support phase. ■ Conclusion Muscle activity differs in that different that shoes sole height and form because tibialis anterior muscle has strengthen and gastrocnemius has stretched. Therefore we think that patients with knee joint problem consider gait parameters when shoes select.

• Journal of the Korean Society for Precision Engineering
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• v.12 no.10
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• pp.69-77
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• 1995

This laser measurement system has been developed using He-Ne laser and photodiode. The laser beam intensity transmitted on a photodiode was disturbed by eccentrically rotating disk cam with various speeds. The photodiode and an amplifier were used to change the detected beam intensity into voltage. The digitized data through the developed system were recorded on a micro-computer by using a signal analysis program. Its reliability was ascertained by using FFT analyzer. The vibration of rotating disk cam can be analyzed by measureing the intensity change of laser beam which the results by FFT analyzer were similar to. The amplifier was devised to be able to modulate the fluctuations of laser beam. The voltage could be linearly recorded with the change of the laser beam intensity.