• Journal of Institute of Control, Robotics and Systems
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• v.12 no.6
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• pp.547-553
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• 2006

This paper studies digital control of biodynamic model of HIV-1 via intelligent digital redesign (IDR). The purpose of the IDR is to develop an equivalent digital fuzzy controller maintaining the satisfactory performance of an existing continuous-time fuzzy controller in the sense of the state-matching. Some conditions for the stability as well as the global state-matching are provided.. They are given by the form of the linear matrix inequalities (LMIs) and thereby easily tractable by the convex optimization techniques. The main features of the proposed method are that 1) the generalized control scheme is provided for the multirate as well as the single-rate digital controllers; 2) a new compensated block-pulse function method is applied to closely match the states of the continuous-time and the sampled-data fuzzy systems in the discrete-time domain; 3) the two-step procedure of IDR is presented to prevent the performance degradation caused by the additional stability conditions. The applicability of the proposed approach is shown through the biodynamic model of HIV-1.

• Child Health Nursing Research
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• v.18 no.3
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• pp.135-142
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• 2012

Purpose: The purpose of this study was to examine the effects of structured nursing intervention for caregivers on maintenance of intravenous (IV) infusions in infants. Methods: The structured nursing intervention was developed through the processes of interviews with nurses from pediatric wards. To identify the effects of the developed nursing intervention, a non-synchronized non-equivalent control group pretest-posttest design study was conducted with caregivers from the pediatric ward from a hospital in Seoul. Of 100 admitted infants, 50 caregivers were assigned to the intervention group and received the structured nursing intervention for maintenance of intravenous infusions in infants. The others were assigned control group and received routine care. Data were collected on patient factors, IV insertion factors, treatments, and IV related complications. The form developed for the structured nursing intervention was used by staff nurses. Results: Compared to the control group, IV insertion frequency in experimental group infants was significantly lower and IV related complications decreased (p<.05). Conclusion: These results suggest that the structured nursing intervention for caregivers on maintenance of intravenous infusions may have effects on maintenance of intravenous infusions in infants, and decreasing IV related complications. This nursing intervention can be used to improve IV related problems of admitted infants.

• Proceedings of the Korean Reliability Society Conference
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• 2006.05a
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• pp.93-100
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• 2006

The failure of hydraulic hose assemblies is caused by the impulse pressure and repetitive motions of bending and stretching (flexing) used at high pressure pipe in the form of bursting Since it takes long time to observe the bursting for life analysis, we can reduce test time by the method of applying the Knockdown stress which is equivalent to 70% of initial bursting pressure on rubber hose assemblies with maintaining the failure mode equally In this study, after scale parameter, shape parameter, and acceleration factor by preforming the impulse pressure test until the hose bursts, and finally analyzed the accelerated life.

• Earthquakes and Structures
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• v.2 no.2
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• pp.149-169
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• 2011

Dynamic response of two adjacent single degree-of-freedom (SDOF) structures connected with friction damper under base excitation is investigated. The base excitation is modeled as a stationary white-noise random process. As the force-deformation behavior of friction damper is non linear, the dynamic response of connected structures is obtained using the equivalent linearization technique. It is observed that there exists an optimum value of the limiting frictional force of the damper for which the mean square displacement and the mean square absolute acceleration responses of the connected structures attains the minimum value. The close form expressions for the optimum value of damper frictional force and corresponding mean square responses of the coupled undamped structures are derived. These expressions can be used for initial optimal design of the friction damper for connected structures. A parametric study is also carried out to investigate the influence of system parameters such as frequency ratio and mass ratio on the response of the coupled structures. It has been observed that the frequency ratio has significant effect on the performance of the friction damper, whereas the effects of mass ratio are marginal. Finally, the verification of the derived close from expressions is made by correlating the response of connected structures under real earthquake excitations.

• Journal of Fashion Business
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• v.19 no.5
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• pp.48-62
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• 2015

The purpose of the study was to investigate how the Classification of the Joseon Dynasty's Beauty characteristics were expressed in a TV documentary focusing ona Re-mediation theory. The methods of study comprised of library research, Internet search, and using TV documentary program case studies. The work this Researcher makeup in the manufacture from the documentary in which the methods the Joseon. Dynasty expressed were selected. The literature, and preceding research, were referred to as a way to help organize the Joseon Dynasty's 'gi-saeng Hwang Jin-Hee', 'woman of royal family', and way of make-up of 'sadae-bu lady'. The TV documentary programs selected were 'MBC special' and '2 parts of channel A documentary special'. First, the improvisation of nature and simultaneity expressed in the Joseon Dynasty's usage of make-up is shown through the interview form reflecting the make-up tools and age direction of the scenes or expert. Second, the interactivity and reality are well seen through the row equivalent in which the model seems to directly use the dressing demonstration of the expert and cosmetics material. Third, the cultural expandability and unexpectedness show through the production of situations which are viewed from the explanation of the narration and letter subtitles and drama.

• KSBB Journal
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• v.8 no.3
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• pp.209-216
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• 1993

For the production of biodegradable polymers from microorganisms a bacterial strain producing a biopolymer was isolated from soil. The bacteriological characteristics of this strain and physicochemical Properties of the biopolymer produced were investigated. The bacterial strain was identified as an alkalophilic Alcaligenes sp. The Purified biopolymer treated with cetylpridinium chloride and acetone was identified as an acidic biopolymer having carboxyl groups and showed strong UV absorbance (at 210nm). The biopolymer was composed of 100% glutamic acid and glutamic acid existed as $\gamma$-polyglutamic acid($\gamma$-PGA) in the form of the $\gamma$-peptide bond. The equivalent weight of this $\gamma$-PGA was estimated about 350, indicating that one acidic fraction per 2.7 residue of $\gamma$-polyglutamic acid existed. The molecular weight was $6.5{\times}10^5$ Daltons.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.15 no.2
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• pp.155-165
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• 1990

The problem of quantization errors in digital filter design arises because of the practical necessity due to finite wordlength implementation. These errors are classified into coefficient quantization error and roung off error. In this paper, in order to analyze and reduce these errors, minimum ceefficient quantization realization is directly derived form impulse responese design specification. And using the equivalent transform relation between minimum coefficient quantization error and minimum roundoff error realizations, we synthesize an optimal realization state-space digital filter. This technique is analyzed by the simulation of an approximated 3rd model, which shows that it is superior to direct or cascade state-space digital filter in quantization errors.

• Journal of Environmental Health Sciences
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• v.22 no.4
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• pp.62-68
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• 1996

Precipitation samples were collected by the wet-only event sampling method at Seoul from September 1991 to April 1995. Concentrations of samples for the ion components($NO_3^-, NO_2^-, SO_4^{2-}, Cl^-, F^-, Na^+, K^+, Ca^{2+}, Mg^{2+}$ and $NH_4^+$) were measured in addition to pH and electric conductivity. During the sampling period, 182 samples were collected, but only 163 samples were identified as valid. The pH, calculated from the volume-weighted $H^+$ concentration, was found to be 4.7, indicating a relatively intensive acidity compared with data from other regions of the world, where acid deposition was known to be a problem. Above all, the concentration of non-seasalt sulfate was $84 \mu eq/L$, which was the highest compared to that measured in other regions of the world. The major acidifying ions in the precipitation at Seoul were identified as sulfate and nitrate except for chloride, because the Cl/Na ratio in the precipitation was close to the ratio in seawater. If all of the non-seasalt sulfate and nitrate existed in the form of sulfuric and nitric acids, respectively, the average pH in the precipitation was calculated as 3.7, lower than the measured value. Consequently, the difference between the calculated and measured pH suggest that the acidity of precipitation was neutralized by alkaline species, not due to the low contribution of an anthropogenic air pollutants to the precipitation. The equivalent concentration ratio of sulfate to nitrate was 3.5, which indicated that the contributions of sulfuric and nitric acids to the precipitation acidity were 78% and 22%, respectively.

• Transactions of the Korean Society of Mechanical Engineers
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• v.16 no.8
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• pp.1429-1437
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• 1992

A new finite element formulation based on the relaxation type hereditary integral is presented for a time-domain analysis of isotropic, linear viscoelastic problems. The semi-discrete variational approximation and elastic-viscoelastic correspondence principle are used in the theoretical development of the proposed method. In a time-stepping procedure of final, linear algebraic system equations, only a small additional computation for past history is required since the equivalent stiffness matrix is constant. The viscoelasticity matrices are derived and the stress computation algorithm is given in matrix form. The effect of time increment and Gauss point numbers on the numerical accuracy is examined. Two dimensional numerical examples of plane strain and plane stress are solved and compared with the analytical solutions to demonstrate the versatility and accuracy of the present method.

• Steel and Composite Structures
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• v.7 no.4
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• pp.279-301
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• 2007

When coupling beams are proportioned appropriately in coupled core wall (CCW) systems, the input energy from ground motions is dissipated primarily through inelastic deformations in plastic hinge regions at the ends of the coupling beams. It is desirable that the plastic hinges form at the beam ends while the base wall piers remain elastic. The strength and stiffness of the coupling beams are, therefore, crucial if the desired global behavior of the CCW system is to be achieved. This paper presents the results of nonlinear response history analysis of two 20-story CCW buildings. Both buildings have the same geometric dimensions, and the components of the buildings are designed based on the equivalent lateral force procedure. However, one building is fitted with steel coupling beams while the other is fitted with diagonally reinforced concrete coupling beams. The force-deflection relationships of both beams are based on experimental data, while the moment-curvature and axial load-moment relationships of the wall piers are analytically generated from cross-sectional fiber analyses. Using the aforementioned beam and wall properties, nonlinear response history analyses are performed. Superiority of the steel coupling beams is demonstrated through detailed evaluations of local and global responses computed for a number of recorded and artificially generated ground motions.