• 대한전기학회논문지:전력기술부문A
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• 제48권9호
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• pp.1055-1063
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• 1999

This paper present a conceptual possibilistic approach using fuzzy set theory to manage the uncertainties in the given reliability input date of the practical power system. In this paper, an algorithm is introduced to calculate the possibilstic reliability indices according to the degree of uncertainty in the given data. The probability distribution function can be transformed into an appropriate possibilstic representation using the probability-Possibility Consistency principle(PPCP) algorithm. In this the algorithm, the transformation is performation by making a compromise between the transformation consistency and the human updating experience. Fuzzy classifcation theory is applied to reduced the number of load data. The fuzzy classification method determines the closeness of load data points by assigning them to various clusters and then determening the distance between the clusters. The IEEE-RTS with 32-generating units is used to demonstrate the capability of the proposed algorithm.

• Structural Engineering and Mechanics
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• 제76권1호
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• pp.27-56
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• 2020

In this paper, the deflection and buckling analyses of porous nano-composite piezoelectric plate reinforced by carbon nanotube (CNT) are studied. The equations of equilibrium using energy method are derived from principle of minimum total potential energy. In the research, the non-local strain gradient theory is employed to consider size dependent effect for porous nanocomposite piezoelectric plate. The effects of material length scale parameter, Eringen's nonlocal parameter, porosity coefficient and aspect ratio on the deflection and critical buckling load are investigated. The results indicate that the effect of porosity coefficient on the increase of the deflection and critical buckling load is greatly higher than the other parameters effect, and size effect including nonlocal parameter and the material length scale parameter have a lower effect on the deflection increase with respect to the porosity coefficient, respectively and vice versa for critical buckling load. Porous nanocomposites are used in various engineering fields such as aerospace, medical industries and water refinery.

• Architectural research
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• 제20권2호
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• pp.45-52
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• 2018

According to previous studies, the form of a city mentioned in Kaogongji(考工記) of Zhouli(周禮) does not exist in reality. Only Beijing during Ming(明) and Qing(淸) Dynasties is discussed as an example, making it lose its worth as a theory. But of all the annotation of Zhouli throughout the 2,000 years before the modern era, core theory related to capital construction had never been stated from the aspect of the present day. Such discussion can be found depicted in Yingzaofashi(營造法式), a specialized book about architectural technology. Unlike what is known until now, the principle of capital construction has a link to the theory of Fengshui(風水), in that it implies the logic of 'Yi(易)'.

• Wind and Structures
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• 제23권1호
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• pp.59-73
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• 2016

In this paper, a hyperbolic shear deformation beam theory is developed for free vibration analysis of functionally graded (FG) sandwich beams. The theory account for higher-order variation of transverse shear strain through the depth of the beam and satisfies the zero traction boundary conditions on the surfaces of the beam without using shear correction factors. The material properties of the functionally graded sandwich beam are assumed to vary according to power law distribution of the volume fraction of the constituents. The core layer is still homogeneous and made of an isotropic material. Based on the present refined beam theory, the equations of motion are derived from Hamilton's principle. Navier type solution method was used to obtain frequencies. Illustrative examples are given to show the effects of varying gradients and thickness to length ratios on free vibration of functionally graded sandwich beams.

• 대한수학회논문집
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• 제34권2호
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• pp.495-506
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• 2019

Motivated by Bloch's principle, we prove a value distribution result for meromorphic functions which is related to Hayman's alternative in certain sense.

• 대한한의학원전학회지
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• 제6권
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• pp.41-53
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• 1993

The theory of 4 great doctors in Geum Won era has been considered as a most scientific medicine after SangHanRon of Jang, Jung Kyung. And it influence for all the later medical theory and practice. I have found a common points between their Fire and Fever pathology and constitutional pathology of Li, Je Ma. The results obtained are as follows. 1. On the Viewpoint of medical history, there is common points in the fact that the start of Geum Won 4 great doctor' principle had been drived from awakening of the abuse of warm and hot herbs based on Hwa Je Guk Bang in the last stage of Song dynasty, and that the appearance of Sa Sang medicine was from the scientific reflection against the currency of the animation by warm herbs which was popular in the Jo Sun dynasty. 2. The theory of Fire and Fever pathology of 4 great doctors has been fixed in the principle of Cold and Fever pathology of viscera and bowel in the Sa Sang medicine. 3. The pathological meaning of 'internal fire' in the conculusion by 4 great doctors has got scientific fruit by Sa Sang medicine in its theory of four constitutional psychology and the formation of four visceras. 4. It is considered that the study of DongUiSuSeBoWon is needed for the relation with former medical theories.

• 대한한의학원전학회지
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• 제35권1호
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• pp.59-79
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• 2022

Objectives : Huangyuanyu's interpretation of the six channel diseases of the Shanghanlun were examined based on contents on the six channel qi metabolism theory in his works, Shanghanxuanjie, Shanghanshuoyi, and Sishengxinyuan. Methods : Contents related to the six channel qi metabolism theory in the Shanghanxuanjie, Shanghanshuoyi, and Sishengxinyuan were extracted and examined to identify a fundamental principle from the perspective of the six channel qi metabolism theory. Characteristics of each of the six channel diseases were organized. Results : Huang's understanding of the six channel diseases in the Shanghanlun could be summarized by the six channel. Its features could be explained as following. First, in examining the principles of the controlling qi[司氣] and constitutionally influenced transformation[從化], the rise and fall of the body's yang qi was emphasized. Second, center qi[中氣] was considered important, the taiyin Spleen being the key to life and death. Third, the pathology of 'earth dampness/water cold/wood stagnation' due to weakness of the center qi was suggested. Fourth, the principle of boosting-yang-suppressing-yin was emphasized in treatment, with criticism of the nurturing-yin-extinguishing-fire method. Conclusions : In understanding the six channel diseases in the Shanghanlun, Huangyuanyu focused on the body's yang qi and center qi based on key theories such as the 'five circuits and six qi' and 'six channel qi metabolism' theories. His perspective could be helpful in understanding Zhangzhongjing's work more comprehensively.

• 건축역사연구
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• 제29권5호
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• pp.51-61
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• 2020

Historically, rhythm has played a key role not only in musical composition, but also in architectural design. In 1893, architectural theorist and art scholar August Schmarsow, in "The Essence of Architectural Creation," created a new definition of architecture as space-creation and characterized rhythm as a design principle. However, this new idea was confronted by Heinrich Wölfflin. While Schmarsow's theory represents a dynamic world-view based on anthropomorphism, the architectural theory of Wölfflin is based on the notion of harmony, displaying a kind of conservative stasis. These two main streams have greatly influenced the development of modern architecture. The concept of space has prevailed in the discourse of modern architecture, but the principle of rhythm has seldom received any positive recognition. This article introduces and develops the concept of rhythm and disputes whether Behrens and Frankl in particular, two who dispute Schmarsow's theories, have used the concept of rhythm in terms of space. I conclude that they could not overcome the notion of the physical-the body-, thus their use of the term rhythm is incongruous with the notion of space. The idea of rhythm in architectural creation remains an up and coming idea.

• Geomechanics and Engineering
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• 제16권1호
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• pp.1-9
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• 2018

In this paper an efficient and simple refined shear deformation theory is presented for the free vibration of Functionally Graded Plates Under Various Boundary Conditions. The theory accounts for a quadratic variation of the transverse shear strains across the thickness, and satisfies the zero traction boundary conditions on the top and bottom surfaces of the plate without using shear correction factors. The number of independent unknowns of present theory is four, as against five in other shear deformation theories. The plates are considered of the type having two opposite sides simply-supported, and the two other sides having combinations of simply-supported, clamped, and free boundary conditions. The mechanical properties of functionally graded material are assumed to vary according to power law distribution of the volume fraction of the constituents. Equations of motion are derived using Hamilton's principle. The results of this theory are compared with those of other shear deformation theories. Various numerical results including the effect of boundary conditions, power-law index, plate aspect ratio, and side-to-thickness ratio on the free vibration of FGM plates are presented.

• Wind and Structures
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• 제29권6호
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• pp.371-387
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• 2019

In the present paper, a simple refined nth-higher-order shear deformation theory is applied for the free vibration analysis of laminated composite plates. The proposed displacement field is based on a novel kinematic in which include the undetermined integral terms and contains only four unknowns, as against five or more in case of other higher-order theories. The present theory accounts for adequate distribution of the transverse shear strains through the plate thickness and satisfies the shear stress-free boundary conditions on the top and bottom surfaces of the plate, therefore, it does not require problem dependent shear correction factor. The governing equations of motion are derived from Hamilton's principle and solved via Navier-type to obtain closed form solutions. The numerical results of non-dimensional natural frequencies obtained by using the present theory are presented and compared with those of other theories available in the literature to verify the validity of present solutions. It can be concluded that the present refined theory is accurate and efficient in predicting the natural frequencies of isotropic, orthotropic and laminated composite plates.