• 동국한의학연구소논문집
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• 제4권
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• pp.189-209
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• 1995

The purpose of this study is to understand a term of 'Jangbu theory 臟腑論' in 'Dong-Eui-Su-Se-Bo-Won 東醫壽世保元'. The conclusion would be summerized as follows. 1. 'Jangbu theory 臟腑論' of 'Sa-Sang medicine 四象醫學' is based on 'Sa-Sang structure 四象構造'. 2. 'Mind 心' of 'Sa-Sang medicine 四象醫學' is recognised as the Lord of body. 3. 'four-Jang 四臟' and 'four-Bu 四腑' constitute 'Sa-Sang structure 四象構造' which is based on the deviation of 'vital energy 氣', and 'four-Jang 四臟' plays a loading role. 4. 'Sacho 四焦' explains the whole function of human body including one's heart's desire, physical constitution and the visceral physiology. 5. 'ear-eye-nose-mouth 耳目口鼻' is connected with 'the profound secrets of nature 天機' and also has a close relation with creation of 'spirit-vital energy-blood-essence 神氣血精' and spiritual fuction. 6. 'SaHae theory 四海論' of 'Dong Mu 東武' is philosophical concept set on the basis of 'nature 天性' and 'life 人命'. 7. 'spirit-vital energy-blood-essence 神機血精' doesn't have the relation of mutual transformation. It's creation and consumption lies on 'the power of ear-eye-nose-mouth 耳目口鼻之力'. 8. 'Sa-Sang medicine 四象醫學' expands its theory centering on the deviation of 'vital energy 氣' and the transversal circulation of 'SaHae 四海' According to the above result, 'Jangbu theory 臟腑論' in 'Dong-Eui-Su-Se-Bo-Won 東醫壽世保元' should be understood on the basis of 'Sacho 四焦' and 'SaHae 四海' according to 'Sa-Sang structure 四象構造', accompanying philosophical thinking focused on human and society, the centural concept of 'Jangbu theory 臟腑論' could be said as 'Mind 心' to be the Lord of body.

• Structural Engineering and Mechanics
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• 제4권3호
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• pp.209-226
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• 1996

One of the major divisions in the mathematical modelling of a tubular structure is to include the effect of the transverse shear stress and rotary inertia in vibration of members. During the past three decades, problems of vibration of tubular structures have been considered by some authors, and special attention has been devoted to the Timoshenko theory. There have been considerable efforts, also, to apply the method of spectral analysis to vibration of a structure with rectangular section beams. The purpose of this paper is to compare the results of the spectrally formulated finite element analyses for the Timoshenko theory with those derived from the conventional finite element method for a tubular structure. The spectrally formulated finite element starts at the same starting point as the conventional finite element formulation. However, it works in the frequency domain. Using a computer program, the proposed formulation has been extended to derive the dynamic response of a tubular structure under an impact load.

• East Asian mathematical journal
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• 제21권2호
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• pp.249-260
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• 2005

Experimentation using computer plays an important part in education and research in graph theory. The purpose of this paper is to develop the CAS techniques for the hands-on approach in graph theory specifically on the topic of constructing the spanning tree. This paper discusses the advantages of CAS as the software system for doing graph theory and introduces the software solutions integrating multimedia user interface developed by the author, which extend the functionality of the existing CAS-based graph theory software package.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1994년도 Proceedings of the Korea Automatic Control Conference, 9th (KACC) ; Taejeon, Korea; 17-20 Oct. 1994
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• pp.354-358
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• 1994

This study is concerned with H$_{\infty}$ control theory of nonlinear systems. Recently H$_{\infty}$ control theory has been developed to nonlinear systems, and especially nonlinear H$_{\infty}$ control theory based on the Hamilton-Jacobi inequality has been proposed. This corresponds to linear H$_{\infty}$ control theory based on the Riccati equation. In this paper, we apply it to a semi-active dynamic vibration absorber for multi-degree-of-freedom structure, and we design its state feedback controller via the Riccati equation. In the simulation, we show that it is effective for a vibration control.rol.

• Steel and Composite Structures
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• 제49권1호
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• pp.31-45
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• 2023

The network theory studies interconnection between discrete objects to find about the behavior of a collection of objects. Also, nanomaterials are a collection of discrete atoms interconnected together to perform a specific task of mechanical or/and electrical type. Therefore, it is reasonable to use the network theory in the study of behavior of super-molecule in sport nano-scale. In the current study, we aim to examine vibrational behavior of spherical nanostructured composite with different geometrical and materials properties. In this regard, a specific shear deformation displacement theory, classical elasticity theory and analytical solution to find the natural frequency of the spherical nano-composite sport structure equipment. The analytical results are validated by comparison to finite element (FE). Further, a detail comprehensive results of frequency variations are presented in terms of different parameters. It is revealed that the current methodology provides accurate results in comparison to FE results. On the other hand, different geometrical and weight fraction have influential role in determining frequency of the structure.

• 인터넷정보학회논문지
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• 제16권6호
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• pp.39-46
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• 2015

지식 공간 이론이란 학습자들이 대해 최대한의 학습 성취를 이끌어 낼 수 있도록 학습자들에 대한 가이드라인을 제공해주는 이론으로 여러 교육 환경에서 사용되어 왔다. 하지만 지식 공간 이론을 사용해왔던 많은 방법들이 주로 수작업을 통해 이루어져 왔고 이러한 작업을 지원하기 위해서 비주얼 베이직 혹은 R 등의 프로그램이 사용되어 왔지만 프로그램을 따로 배워야 하는 불편함과 시간적으로 낭비되는 등의 문제를 야기해 왔다. 본 논문에서는 이러한 문제를 해결하기 위해서 지식 공간상에서 학습자들의 지식구조를 자동으로 분석하고 결정적 학습 경로를 제공하는 이른바 지식 구조 분석 시스템을 제안한다. 제안된 시스템은 아파치 웹상에서 구현되었고, 카이 제곱 값을 산출하여 결정적 학습 흐름도를 도출하도록 하였다. 제안된 방법은 사용자들이 웹에서 편리하게 학습자들의 지식 상태 분석할 수 있도록 환경을 제공하고 지식 구조의 체계적인 검토를 위한 방법을 제시해준다.

• 대한화학회지
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• 제20권2호
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• pp.118-128
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• 1976

액체에 대한 significant structure theory 와 상의 전이에 대한 Bragg-Williams근사를 사용하여 액정 화합물인 p-azoxyanisole의 열역학적 성질을 nematic phase와 isotropic phase의 온도범위에 걸쳐 계산하였다. Isotropic phase는 일반적인 액체로 보았으며 nematic phase는 액체적인 성질외에도 분자쌍극자의 배열에 의한 영향도 고려하였다. p-Azoxyanisole의 액체적인 성질은 significant structure theory로 기술하였으며 분자쌍극과 배열에 의한 영향은 Bragg-Williams 근사로써 고려하였다. 부피, 증기압, 정압비열, 열팽창계수, nematic-isotropic 전이점에서의 엔트로피 엔탈피 변화, 절대엔트로피, Helmholtz free energy등을 계산하여 실험치와 비교하였다.

• 한국병원경영학회지
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• 제11권4호
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• pp.19-36
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• 2006

This study aims to examine the influence of growth rate, profitability and current ratio, which are confronted with static trade-off theory and pecking order theory, on capital structure of superior hospital and bankrupt hospital. Firstly, superior hospitals show positive correlation between growth rate and short-term loans, long-term loans, and short-term liabilities while bankrupt hospitals represent negative correlation. Superiority hospital and bankruptcy hospital show different financing behaviors, especially, short-term loan is the significant characteristic that discriminates between superior hospital and bankrupt hospital. Secondly, this paper studied the correlation between profitability and short-term loan, which the superior hospitals shows negative correlation, to contrast, bankrupt hospital have positive correlation. Consequently, the short-term loan is the most distinguishable factor between the superior hospital and bankrupt hospitals in terms of profitability. To conclude, this study shows that excess short-term loans can be the most important cause for hospital's bankrupt. Accordingly, strategic and effective policy about the short-term loan will be required in order to protect hospital's bankrupt.

• Geomechanics and Engineering
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• 제2권4호
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• pp.229-252
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• 2010

In this paper, Soil-Structure Interaction (SSI) effect is investigated using a new and integrated approach. Faster solution of time dependant differential equation of motion is achieved using numerical representation of wavelet theory while dynamic Infinite Elements (IFE) concept is utilized to effectively model the unbounded soil domain. Combination of the wavelet theory with IFE concept lead to a robust, efficient and integrated technique for the solution of complex problems. A direct method for soil-structure interaction analysis in a two dimensional medium is also presented in time domain using the frequency dependent transformation matrix. This matrix which represents the far field region is constructed by assembling stiffness matrices of the frequency dependant infinite elements. It maps the problem into the time domain where the equations of motion are to be solved. Accuracy of results obtained in this study is compared to those obtained by other SSI analysis techniques. It is shown that the solution procedure discussed in this paper is reliable, efficient and less time consuming as compared to other existing concepts and procedures.

• 대한기계학회논문집A
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• 제24권9호
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• pp.2201-2210
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• 2000

Vibration of a rotating disk-spindle system is analyzed by using Hamilton's principle, FEM and substructure synthesis. A rotating disk undergoes the rigid body motion and the elastic deformation. It s equation of motion is derived by Kirchhoff plate theory and von Karman nonlinear strain. A rotating shaft is described by Rayleigh beam theory considering the axial rigid body motion. The stationay shaft supporting the rotating disk-spindle-bearing system is modeled by Euler beam theory, and the stiffness of ball bearing is determined by A.B.Jones' theory. FEM is used to solve the derived governing equations, and substructure synthesis is introduced to assemble each structure of the rotating disk-spindle system. The developed theory is applied to the spindle system of a 35' computer hard disk drive with 3 disks to verify the simulation results. The simulation results agree very well with the experimental ones. The proposed theory may be effectively expanded to the complex structure of a disk-spindle system.