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Thermally induced vibration of an axially-traveling strip: spectral element analysis

100%

Lee U. , Kwon K.

2006

tom Vol. 17, nr 1-2

261--264

Purpose: A spectral element model is developed for accurate prediction of the dynamic characteristics of an axially-traveling strip subjected to a sudden thermal loading. Design/methodology/approach: The spectral element model is formulated from the frequency-dependent dynamic shape functions which satisfy the governing equations in the frequency-domain and its extremely high accuracy is evaluated by comparing with the conventional finite element model in which simple polynomials are used as the shape functions. Also some numerical studies are conducted to investigate the vibration characteristics of an example axially-traveling strip subjected to a sudden thermal loading on its upper surface. Findings: The present spectral element model is shown to provide very accurate dynamic characteristics by treating a whole uniform strip between two boundary supports as a single finite element, regardless of its length, when compared with the conventional finite element model. Practical implications: Numerical studies for the typical example problem show that the dynamic characteristics of an axially-traveling strip may depend on the traveling speed and the duration and frequency characteristics of the externally applied thermal loading. Originality/value: The spectral element model presented in this paper is the first one for the axially-traveling strips subjected to thermal loadings and is applicable to the engineering problems such as the galvanized steel strip passing through a hot zinc tank, for instance.

A fuzzy controller with a real-time tuning algorithm and its application to a steam generator water level control

100%

Jung C. , Kwon K.

Control and Cybernetics

1998

tom Vol. 27, no 4

545-564

It is nesessary to tune the fuzzy rules and the scalling factors in real-time control of a large scale system, the steam generator of a nuclear power plant, as it is related to safety and availability of the plant. A novel real-time tuning algorithm of fuzzy controller based on the scaling factors is proposed and applied to the steam generator water level control system of the nuclear power plant. The new real-time tuning algorithm adopts a variable reference tuning index for a good system tuning response and an instantaneous system fuzzy performance for scaling factor tuning. For the fuzzy steam generator controller, an image signal of feedwater flow error at low power is proposed and pressure compensation rules and a gain scheduler of feedwater temperature are designed also. The fuzzy controller of the steam generator water level is simulated by the proposed method. The simulation results show that the improved performance of the steam generator water level controller by the proposed method.

Peeled volume models of a whole body to enhance comprehension of anthropological bone landmarks

80%

Kwon K. , Chung M. S. , Shin B.-S. , Chung B. S.

nr 4

Background: In physical anthropology, bone landmarks are palpated in living humans for the identification of corresponding skin landmarks and exact biometry. The purpose of this study is to help comprehend the locations and depths of representative bone landmarks all over the body. Materials and methods: The sectioned images of a male cadaver’s whole body were used to build a volume model, which was continuously peeled at 1 mm thicknesses to disclose 27 selected landmarks in the anterior, lateral, or posterior views. Results: The captured views of peeled volume models along with the labels of the bone landmarks were loaded to browsing software that was distributed for free. The browsing software containing the peeled volume models will enhance convenient studying of the bone landmarks. Conclusions: With the knowledge of bone landmarks, investigators would be able to attain more accurate measurements between skin landmarks. (Folia Morphol 2019; 78, 4: 833–838)

Age estimation for children and young adults by volumetric analysis of upper anterior teeth using cone-beam computed tomography data

61%

Yang Z. , Fan L. , Kwon K. , Pan J. , Shen C. , Tao J. , Ji F.

tom 79

nr 1

Age estimation for children and young adults by volumetric analysis of upper anterior teeth using cone-beam computed tomography data

61%

Yang Z. , Fan L. , Kwon K. , Pan J. , Tao J. , Ji F.

tom 79

nr 4