Sang-Kwon Lee

TL;DR: In this article, the authors developed a blower model based on FEM(finite element method) model which is reliable by correlation of frequencies and MAC(modal assurance criterion) values between EMA(experimental modal analysis) and FEA(fine element analysis), which is applied to predict the vibration of the blower by using inverse force identification method and predict the radiating noise by using BEM(boundary element method).

Abstract: This article presents the method of identifying the locations of the multiple impacts on a plate where the impacts occur sequentially. The main aim of this research is to provide the basis on the human-interaction technology using variety of methods used in the area of signal processing, piezoelectric materials, and wave propagation. The work concerning the location identification of a single impact on a plate has been previously studied by means of the time-frequency analysis applied to accelerometer signals. In this article, a novel approach for the location identification of the discrete multiple impacts is presented to investigate the feasibility of applying to a more practical human-interaction system. For the identification of the series of impact locations, the major axisymmetry mode of the Lamb wave on the plate is considered and the CWT is applied to obtain the arrival time difference of the Lamb waves between sensors. Then, the Kalman filtering technique is employed to continuously track the loc...

TL;DR: In this article , the authors used the sky view factor (SVF) in ENVI-met, a 3D microclimate modeling program, to classify urban spaces into closed, semi-open, and open areas.

TL;DR: A new booming index is presented, which is developed by using psychoacoustics theory and neural network theory, and the correlation for booming sounds between objective values evaluated by the trained neural network system and the subjective values evaluation by the 21 persons are well corresponded.