• Journal of applied mathematics & informatics
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• v.7 no.2
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• pp.453-465
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• 2000

In this paper, a new method for finding the approximate solution of a second order nonlinear partial differential equation is introduced. In this method the problem is transformed to an equivalent optimization problem. them , by considering it as a distributed parameter control system the theory of measure is used for obtaining the approximate solution of the original problem.

• Journal of applied mathematics & informatics
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• v.6 no.2
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• pp.513-522
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• 1999

In this paper we present a collocation method based on biquintic splines for a fourth order elliptic problems. To have a better accuracy we formulate the standard collocation method by an appro-priate perturbation on the original differential equations that leads to an optimal approximating scheme. As a result computational results confirm that this method is optimal.

• 제어로봇시스템학회:학술대회논문집
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• 1987.10b
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• pp.155-160
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• 1987

In this paper, the model reduction method of the linear time invariant continuous systems is proposed. The denominator of reduced order model is determined by the eigenvalue selected considering the error of the power series that exists between original system and reduced order system at each time moments. And the numerator of model is founded by the time moment matching method. The method suggested is compared with other various methods in examples.

• Bulletin of the Korean Mathematical Society
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• v.43 no.4
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• pp.791-804
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• 2006

This paper is concerned with a second-order iterated differential equation of the form $c_0x'(Z)+c_1x'(z)+c_2x(z)=x(az+bx(z))+h(z)$ with the distinctive feature that the argument of the unknown function depends on the state. By constructing a convergent power series solution of an auxiliary equation, analytic solutions of the original equation are obtained.

• 전기의세계
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• v.24 no.5
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• pp.67-71
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• 1975

A dynamic stability analysis of a large interconnected power system takes much time even though the modern large computer is used because of the high order of the system dynamic equations. By the necessity of the low order power system models, a simplified power system model of the generator with the high speed solid state exciter is developed in this paper. The usefulness of the reduced model is confirmed by comparing its eigenvalues and the transient responses with those of the original model in the single machine to infinite bus power system.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.13 no.5
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• pp.436-444
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• 2002

This paper presents a new method, which uses defected ground structure (DGS) on the ground planes of planar transmission lines such as microstrip and coplanar waveguide (CPW), to reduce the size of amplifiers. The main idea can be summarized as follow; DGS on the ground plane of microstrip or CPW line shows an increased slow-wave effect due to the additional equivalent L-C components. So the electrical length of the transmission line with DGS is longer than that of the standard transmission line for the same physical length. Then, the length of the transmission line with DGS can be shortened in order to maintain the original electrical length to be the same. This leads the matching of the original amplifier to be kept. In order to show the proposed method is valid, two kinds of amplifiers, the original amplifier and reduced amplifier, are fabricated, measured, and compared using both microstrip and CPW. The measured performances of the reduced amplifiers with DGS are quite similar to the ones of the original amplifiers for both microstrip and CPW amplifiers, even though the size of matching networks of the amplifiers with DGS are much smaller than those of the original amplifiers.

• Journal of Sasang Constitutional Medicine
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• v.13 no.2
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• pp.94-109
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• 2001

1. Background and Purpose ${\ulcorner}$DongyiSooseBowon${\lrcorner}$ is the book that was mixed ${\ulcorner}$GaboBon${\lrcorner}$ and ${\ulcorner}$KyungjaBon${\lrcorner}$ which was written by DongMu. But hardly any clause or text of the GaboBon excepting ${\ulcorner}$DongyiSooseBowon${\lrcorner}$ has been described. At the year of 2000, the society of sasang constitutional medicine acqired ${\ulcorner}$HamsanSachon DongyiSooseBowon GaboGubon${\lrcorner}$ which is seen as a written copy of ${\ulcorner}$GaboBon${\lrcorner}$. According to Lee Sung-Su who is the great-grandson of DongMu's older brother, ${\ulcorner}$HamsanSachon DongyiSooseBowon GaboGubon${\lrcorner}$ was worked by Lee Jin-Yoon who is the grandson of DongMu's older brother, and it was copied by Han Min-Gab and now is owned by Lee Sung-Su who is son of Lee Jin- Yoon. 2. Methods This paper was written in order to understand of ${\ulcorner}$HamsanSachon DongyiSooseBowon GaboGubon${\lrcorner}$ through the study to focus on the bibliographical character. 3. Result and Conclusion 1) It is reasonable that ${\ulcorner}$HamsanSachon DongyiSooseBowon GaboGubon${\lrcorner}$ had copied to the original ${\ulcorner}$DongyiSoose Bowon GaboGubon${\lrcorner}$ which was written by DongMu. 2) We can find the character of ${\ulcorner}$HamsanSachon DongyiSooseBowon GaboGubon${\lrcorner}$ as follows. (1) It has the table of contents, the definition of the number of the texts, and the article number of each texts. (2) ${\ulcorner}$KyungJaBon${\lrcorner}$ and ${\ulcorner}$SinchukBon${\lrcorner}$ has different number of the texts about ${\ulcorner}$The general remarks on the Soyangin${\lrcorner}$. (3) It is different with original ${\ulcorner}$GaboBon${\lrcorner}$ because of the extracting marks of the text. (4) It is supposed that it has the pares which was additionally or wrongly amended by someone. 3) We can consider that the character of original ${\ulcorner}$GaboBon${\lrcorner}$ which was written by DongMu from ${\ulcorner}$HamsanSachon DongyiSooseBowon GaboGubon${\lrcorner}$ as follows. (1) ${\ulcorner}$The Discourse on Nature and Order${\lrcorner}$${\sim}$${\ulcorner}$The Discourse on the Four Principles${\lrcorner}$ is original articles of ${\ulcorner}$GaboBon${\lrcorner}$. (2) The head title of${\ulcorner}$The Discourse on the Origin of Oriental Medicine${\lrcorner}$ was not in ${\ulcorner}$GaboBon${\lrcorner}$. (3) It is not clear whether ${\ulcorner}$The Discourse on the General Health Maintenance${\lrcorner}$ and ${\ulcorner}$The Discourse on Identifying Four Constitutions${\lrcorner}$ is original texts or amended texts of ${\ulcorner}$GaboBon${\lrcorner}$. So it is required more study about it.

• Korean Journal of Heritage: History & Science
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• v.43 no.3
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• pp.26-47
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• 2010

When the term conservation is used with regard to excavated features, it means not only conservation but also restoration. Restoring the features here does not imply restoring their original form but restoring their form at the moment of excavation. That means, the conservation of excavated features includes the concept of both reparation and restoration. The way of conserving excavated features can be largely categorized into on-site conservation and transfer conservation. On-site conservation means to conserve excavated features as they were at the excavation site. It can be further categorized into soil-covered on-site conservation, in which excavated features are covered with soil to prevent them from being damaged, and exposed on-site conservation in which the features were conserved as they were exposed. Transfer conservation is operated on the premise that excavated features are transferred to another place. It can be further categorized into original form transfer, transcribing transfer, reproduction transfer, and dismantlement transfer. Original form transfer refers to the method of moving the original forms of excavated features to another place. Transcribing transfer refers to moving some of the surfaces of excavated features to another place. Reproduction transfer refers to restoring the forms of excavated features in another place after copying the forms of excavated features at the excavation site. Dismantlement transfer refers to the method of restoring excavated features in a place other than the excavation site in the reverse order of dismantlement after dismantling the features at the excavation site. The most fundamental issue regarding conserving excavated features is the conservation of their original forms. However, the conservation of excavated features tends to be decided depending on a variety of conditions such as society, economy, culture, and local situations. In order to conserve excavated features more effectively, more detailed and specialized conservation methods should be created. Furthermore, continuing research is needed to find the most effective way of conserving them through exchange with other neighboring academic fields and scientific technology.

• Journal of Korean Institute of Industrial Engineers
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• v.3 no.2
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• pp.93-97
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• 1977

PERT/CPM type scheduling systems use a network to graphically portray the interrelationship among the activities of a project. This network representation of the project schedule shows all the precedence relationship regarding the order in which tasks must be performed. In this paper an algorithm is presented that changes the network configurations without violating precedence relationship of the original network.

• Journal of Biomedical Engineering Research
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• v.25 no.1
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• pp.83-86
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• 2004

The variation of the directional properties of an image is used to extract the iris code for human identification. In order to conserve the original information while minimizing the effect of noise, scale-space filtering is applied. Resulting binary codes have been tested on a set of 272 iris images obtained from 18 persons.