• YAKHAK HOEJI
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• v.47 no.1
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• pp.10-13
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• 2003

The phytochemical study of Cacalia koraiensis Nakai (Compositae) led to the isolation of eight compounds, $\beta$-sitosterol (1), stigmasterol (2), phytol (3), $\beta$-sitosterol-3-Ο-glucopyranoside (4), adenostylol (5), campesterol (6), germacradien-4$\alpha$-ol (7), and quercetin-3-rhamnoside (8). Their structures were established by chemical and spectroscopic methods. The cytotoxicity of the isolated compounds was evaluated by SRB assay against five cultured human tumor cell lines.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 2002.04a
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• pp.429-434
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• 2002

In order to improve the accuracy in the field of simiconductor and LCD research equipment, the demand of XYZ stage which is possible to control X axis, Y axis and Z axis has been increased steadly in place of the existing XY stage which is only practicable to X & Y axis positioning control. This paper presents a new pneumatic actuator for Micro-positioning control in the XYZ stage. Air pressure in a pneumatic actuator is controlled by the E/P Regulator. The control range of pneumatic actuator is about 100 micro-meters and it's construction concept is easy to apply a practical state

• Journal of the Korean Institute of Telematics and Electronics
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• v.22 no.2
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• pp.18-24
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• 1985

Above certain filter order, the frequency domain -adaptive filter is superior to the time domain-adaptive filter in computational complexity. In this paper a new type algorithm, $\mu$-FLMs algorithm, is proposed for the frequency domain- adaptive filter and the characteristics of the proposed algorithm is compared with that of the time domain- adaptive filter algorithm($\mu$-FLMS algorithm). The simulation results showed that under the same convergence rate , the frequency domain-adaptive filter is efficient in compu tational burden.

• Journal of Information Technology Applications and Management
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• v.16 no.4
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• pp.19-40
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• 2009

In case of korea, it is said that the service of internet banking is in maturity regarding the number of transactions that internet banking process. So it is necessary to find out the factors that influence customer's trust on bank with the use of internet banking, to preserve existing customers. The purpose of this study is to investigate the effects of the internet banking service quality on trust of banks. For this purpose, eight hypotheses are empirically tested using logistic regression. The empirical results indicated that responsiveness, easy of use, and accuracy from the six dimensions of internet banking service quality factors take significant effect on trust of bank.

• Proceedings of the Korean Society For Composite Materials Conference
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• 2002.10a
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• pp.183-188
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• 2002

Co-cured composite materials has its own characteristics, so its thermal expansion is different each other. The selection of tool material for co-cured composite part in high temperature more over $350^{circ}F$ and 50 Psi pressure have to consider part thermal expansion, size, shape, and economic aspect in production line. So it is important choose tooling material in manufacturing composite parts. We called the tool for airplane composite parts as BAJ (Bonding Assembly Jig). Composite parts are cured on the BAJ in autoclave. BAJ have to stable at high temperature over $350^{circ}F$ and 50 Psi pressure, Considering composite parts' dimensional tolerance compare to heat up in autoclave. This paper come from the results of the experiment at the composite parts production line and review other aircraft company's method for tooling This is for the engineer engaged in composite parts manufacturing.

• Proceedings of the Earthquake Engineering Society of Korea Conference
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• 2001.09a
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• pp.139-146
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• 2001

The seismic safety analysis were performed for the center-core rockfill dam(CCRD) The static and pseudo-static FEM analysis using seismic coefficient Method, and dynamic FEM analysis using Hachinohe earthquake wave(0.12g) were used for the seismic safety of CCRD. The results of seismic analysis were that the factor of safety of down slope was 1.5, horizontal displacement is about 14.3cm, and vertical displacement is 3.3cm at dam creast. The model dam did not show any seismic stability problems for 0.12g. And much more research is still necessary in seismic safety of CCRD.

• Proceedings of the Earthquake Engineering Society of Korea Conference
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• 2001.09a
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• pp.147-154
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• 2001

In this study, comprehensive seismic performance analysis were performed for the concrete face rockfill dam(CFRD) designed seismic coefficient method(0. 10g). The static and pseudo-static FEM analysis, limited equilibrium method and dynamic FEM analysis were used for the dam safety analysis. The results of the seismic analysis were that the minimum factor of safety of down slope was 1.2 and horizontal displacement increased 8cm and vertical displacement increased 1.2cm at dam crest rather than those of static condition. The model dam did not show any serious tai lure in seismic stabi1ity for 0.13g. And much more research is still necessary in seismic safety of CFRD.

• Journal of Food Hygiene and Safety
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• v.14 no.2
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• pp.186-194
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• 1999

The Budget method used currently in Codex for estimation of use levels of food additives was investigated and the specific approach that can be applicable for Koreans has been proposed. Theoretical maximum daily intakes(TMDIs) of benzoate, $\rho$-hydroxybenzoic acid ester, butylated hydroxyanisole(BHA), butylated hydroxytoluene (BHT), t-butylhydroquinone(TBHQ), nitrite, nitrate, sorbate, and sulfite were estimated and compared with corresponding acceptable daily intakes(ADIs). Additives requiring further precise evaluation were screened. TMDIs of benzoate, BHA, BHT, TBHQ, nitrite, and sulfite exceeded ADIs. On the other hand, it is appeared that TMDIs of $\rho$-hydroxybenzoic acid ester, nitrate, and sorbate were below ADIs. It is expected that the Budget method may be used as one approach for the estimation of use level and risk assessment.

• Journal of the Korean Institute of Telematics and Electronics
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• v.22 no.3
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• pp.16-22
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• 1985

In this paper a new algorithm named modified delta modulation (MDM) for encoding filter coefficients is proposed. And this paper presents the designing method of multiplier less FIR filters rosin영 Proposed MDM a19orithm. In the delta modulation (DM) system the quantiaation levels consist of two levels $\pm$1, but in newly proposed MDM algorithm quantization levels are extended to many levels 0, $\pm$2$^n$, n=0, 1, 2... It is recognized by the result of computer simulations that frequency response of multi-plierless FIR filters designed by MDM algorithm is relatively good. And comparing with con-ventional FIR filters on the number of hardware devices, this filter needs a little increased memory, but regardless of filter order it needs only one multiplier which is used for signal scaling.

• Journal of the Korean Institute of Telematics and Electronics
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• v.22 no.6
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• pp.76-82
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• 1985

The convergence properties of Burg algorithm, which is commonly used to calculate the reflection coefficients in the adaptive lattice filters, are studied in this paper. Applying the $\mu$ algorithm to Burg algorithm, a new adaptive lattice $\mu$ algorithm is derived and it shows that the convergence speed of this algorithm is higher than that of Burg algorithm. As a result of theoretical analysis and computer simulation, it is proved that the con-vergence speed of the proposed algorithm is remarkably higher than that of Burg algorithm when the convergence speed of Burg alsorithm is low.