• Transactions of the Korean Society for Noise and Vibration Engineering
• /
• v.15 no.7 s.100
• /
• pp.843-850
• /
• 2005

In this study, simplified whirl flutter analyses using quasisteady aerodynamic theory have been Performed for a 2-DOF tiIt-rotor system with both pitch and Yaw motions of a rotor-nacelle. The present dynamic system consists of the rotor (propeller) , forming the gyroscopic and aerodynamic element, supported horizontally by a pylon that is pivoted at some wing attachment point. Several design parameters for rotor-nacelle system are considered to practically investigate the effects of whirl flutter stability.

• Journal of the military operations research society of Korea
• /
• v.30 no.2
• /
• pp.63-80
• /
• 2004

This paper develops a methodology which can be used to quantify the combat effectiveness of the army C2A system by modifying C2 theory and using Air Defense Engagement Simulation. In this paper, by using Schutzer's C2 theory and Measures of Effectiveness, we modified the MOE formula he designed. Because the combat effectiveness by enhancement of C2(Command and Control) system will increase combat power of individual asset independently. In addition, we developed simulation analysis of air defense scenario by using Air Defense Engagement Simulation. The results show that modified the MOE formula is proper as compared with Air Defense Engagement Simulation method. The combat effectiveness can be obtained as a result of improved probability of detection and information accuracy through real-time information sharing and coordination by C2A system.

• Proceedings of the KIEE Conference
• /
• 1996.11a
• /
• pp.401-403
• /
• 1996

In this paper, a new control strategy is presented that combines sliding mode control theory with a neural network. Sliding mode control theory requires the complete knowledge of the dynamics of the controlled system. However, in practice, one often bas only a small number of state measurements. This could be a serious limitation on the practical usefulness of sliding mode control theory. A multilayer neural network is employed to solve this kind of problem. The neural network serves as a compensator without a prior knowledge about the system. The proposed control algorithm is applied to a class of uncertain nonlinear system. The robustness against parameter uncertainty, nonlinearity and external disturbances, and the effectiveness is verified by the simulation results.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2000.11a
• /
• pp.784-789
• /
• 2000

Equations of motion are derived and solved using the finite element method substructure synthesis for the disk-spindle system with rigid spindle and flexible shaft. The disk is modeled as a flexible spinning disk by Kirchhoff plate theory and von Karman nonlinear strain. The spindle supporting the flexible disk is modeled as a rigid body to consider its complex geometry. The stationary shaft supporting the rotating disk-spindle-bearing system is modeled by Euler beam, and the ball bearings are modeled as the stiffness matrix with 5 degrees of freedom. Developed theory is applied to analyze the vibration characteristics of a 3.5" HDD and a 2.5" HDD, respectively, and modal tests are performed to verify the simulation results. This paper shows that the developed theory can be effectively applied to the rotating disk-spindle system with the spindle of complex shape.

• Smart Structures and Systems
• /
• v.18 no.6
• /
• pp.1125-1143
• /
• 2016

Forced vibration analysis of a simple supported viscoelastic nanobeam is studied based on modified couple stress theory (MCST). The nanobeam is excited by a transverse triangular force impulse modulated by a harmonic motion. The elastic medium is considered as Winkler-Pasternak elastic foundation.The damping effect is considered by using the Kelvin-Voigt viscoelastic model. The inclusion of an additional material parameter enables the new beam model to capture the size effect. The new non-classical beam model reduces to the classical beam model when the length scale parameter is set to zero. The considered problem is investigated within the Timoshenko beam theory by using finite element method. The effects of the transverse shear deformation and rotary inertia are included according to the Timoshenko beam theory. The obtained system of differential equations is reduced to a linear algebraic equation system and solved in the time domain by using Newmark average acceleration method. Numerical results are presented to investigate the influences the material length scale parameter, the parameter of the elastic medium and aspect ratio on the dynamic response of the nanobeam. Also, the difference between the classical beam theory (CBT) and modified couple stress theory is investigated for forced vibration responses of nanobeams.

• Structural Engineering and Mechanics
• /
• v.60 no.3
• /
• pp.489-505
• /
• 2016

Sinusoidal shear deformation theory (SSDT) is developed here for dynamic buckling of functionally graded (FG) nano-plates. The material properties of plate are assumed to vary according to power law distribution of the volume fraction of the constituents. In order to present a realistic model, the structural damping of nano-structure is considered using Kelvin-Voigt model. The surrounding elastic medium is modeled with a novel foundation namely as orthotropic visco-Pasternak medium. Size effects are incorporated based on Eringen'n nonlocal theory. Equations of motion are derived from the Hamilton's principle. The differential quadrature method (DQM) in conjunction with Bolotin method is applied for obtaining the dynamic instability region (DIR). The detailed parametric study is conducted, focusing on the combined effects of the nonlocal parameter, orthotropic visco-Pasternak foundation, power index of FG plate, structural damping and boundary conditions on the dynamic instability of system. The results are compared with those of first order shear deformation theory and higher-order shear deformation theory. It can be concluded that the proposed theory is accurate and efficient in predicting the dynamic buckling responses of system.

• The Journal of the Society of Korean Medicine Diagnostics
• /
• v.19 no.1
• /
• pp.55-63
• /
• 2015

Objectives In order to the review of the Yoon Gil-Young's theory on the "differentiation of syndromes", we studied on the his method and system of classification on the "differentiation of syndromes". Methods We reviewed on "The Clinical Formula Science Traditional Korean Medicine 東醫臨床方劑學", "A study on the Methodology of Traditional Korean Medicine 東醫學의 方法論硏究" "The theory of SaSang Constitution Medicine 四象體質醫學論". From a connected standpoint with the basic theory and clinical medicine, considered on the Yoon Gil-Young's theory of "differentiation of syndromes". Results Yoon Gil-Young's theory of differentiation of syndromes and treatment was widespread so much that he studied on the learning field of Traditional Korean Mediciine and ingenious as well. The main principles of differentiation of syndromes was summarized the three representative syndrome-complexes; BON-HER(original deficiency syndrome), BON-HAN(orginal cold excess syndrome), BON-YEOL(original heat excess syndrome). And also the three representative syndrome-complexes was previously carried out the details of differentiation of syndromes and assigned represent prescription one by one. Conclusions As the results, Yoon Gil-Young insisted the system of differentiation of syndromes closely connecting with Traditional Korean Medical physiology, pathology, diagnosis and prescriptions. And therefore he was a frontier of the field of Traditional Korean Medicine.

• Journal of Acupuncture Research
• /
• v.36 no.1
• /
• pp.1-11
• /
• 2019

Models of traditional Chinese medicine (TCM) are still difficult to grasp from the view of a Western-cultural background. For proper integration into science and clinical research, it is vital to think "out of the box" of classical sciences. Modern sciences, such as quantum physics, system theory, and information theory offer new models, that reveal TCM as a method to process information. For this purpose, we apply concepts of information theory to propose a "Chinese black box model," that allows for a non-deterministic, bottom-up approach. Considering a patient as an undeterminable complex system, the process of getting information about an individual in Chinese diagnostics is compared to the input-process-output principle of information theory and quantum physics, which is further illustrated by Wheeler's "surprise 20 questions." In TCM, an observer uses a decision-making algorithm to qualify diagnostic information by the binary polarities of "yang" (latin activity) and "yin" (latin structivity) according to the so called "8 principles" (latin 8 guiding criteria). A systematic reconstruction of ancient Chinese terms and concepts illuminates a scattered scientific method, which is specified in a medical context by Latin terminology of the sinologist Porkert [definitions of the Latin terms are presented in Porkert's appendix [1] (cf. Limitations)].

• Journal of Sasang Constitutional Medicine
• /
• v.31 no.1
• /
• pp.79-93
• /
• 2019

Objective The purpose of this study was to show that the characteristics of the Sasang Constitutional Medical theory(SCM) are different from the traditional medical theory by comparing their theories of humans and pathophysiology. Methods The establishments and developments of the traditional medical theory were reviewed. Then the hypothesis that the theoretical foundation of SCM is different from that of the traditional medical theory was tested by comparing the traditional medical theory and SCM with respect to the theories of humans and the reconstructed theory of pathophysiology. Results The main findings of this study can be summarized as follows. 1. The theory of SCM reconstructed the traditional medical theory by shifting the paradigm concerning the structure of human existence. 2. The theory for SCM reconstructed the theory of pathophysiology by expanding Confucian moral theory from an experiential perspective. 3. The theory of SCM categorizes humans into four constitution groups according to congenital individuality in emotional expressions and pathophysiological functions. The categorization is based on medical treatment through which it was found that there are congenital individuality in the expression of his moral feelings. 4. The reconstructed pathophysiological theory of the SCM provides the foundation for establishing a verifiable medical theory. Discussion and conclusion The Sasang Constitutional Medical Theory is based on the idea that humans do not follow the changes of Nature but pursue morality and wealth in the Sasang system of the Heavenly qi and human affairs. Therefore, the theory is founded on Confucian moral theory but develops its own view of the theory of pathophysiology by way of experiential interpretation.

• The Journal of Korean Academic Society of Nursing Education
• /
• v.3 no.2
• /
• pp.246-254
• /
• 1997

Nursing have been caught between the paradigm of medical science with a body part view of a person and the paradigm of medical science with an emphasis on unsurpassable control, rigor, objectivism, and neutrality of value. But it is inappropriate to apply impersonal, objective model of science for the personal unique and gestalt experiences of nursing phenomena. Jean Watson proposed a theory of human caring based on human science paradigm to explain human phenomena. This study reviewed the theory of nursing by Jean Watson and the researches based on Waton's theory. In this study the researcher examined the philosophical back ground, value system and key concepts of Watson's theory Watson's perspective of person and human existence includes humanistic and phenomenological characteristics. She also emphasized nurse-patient relationship as an intersubjective(transpersonal) caring relationship. Examination of the studies based on Watson's theory consistantly revealed Watson's theory of human caring based on the human science paradigm is more appropriate than traditional medical science paradigm for explaining nursing phenomena. For the purpose of refining the theory and promoting usefulness of the theory, it would be desirable to test the theory to the nursing phenomena and to apply the theory to practice and education.