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백승진,성형진,Baek, Seung-Jin,Seong, Hyeong-Jin 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.9
A new feedback control law is proposed and tested for suppressing the vortex shedding from a circular cylinder in a uniform flow. The lift coefficient ( $C_{L}$) is employed as a feedback control signal and the control forcing is given by a rotational oscillation of the cylinder. The influence of the feedback transfer function on the $C_{L}$ reduction is examined. The main rationale of the feedback control is that a feedback control forcing is imposed at a phase which is located outside the range of lock-on. By applying the feedback control law, $C_{L}$ is reduced significantly. Furthermore, the reduction mechanism of $C_{L}$ is analyzed by showing the vortex formation modes with respect to the forcing phase.e.ase.e.
무용지도자의 언어적·비언어적 커뮤니케이션이 수강생들의 만족과 장기적관계지향성에 미치는 영향
백승진(Baek, Seung-Jin),한진욱(Han, Jin-Wook),박혜리(Park, Hye-Ri) 한국체육과학회 2017 한국체육과학회지 Vol.26 No.4
The purpose of the study was to examine how the verbal and nonverbal communication of dance instructors affects the satisfaction and long-term relationship intention of trainees. To achieve this goal, 250 trainees were conveniently selected from sports centers, community centers, and culture centers in Seoul and Gyeonggi-do. 238 usable samples were utilized data analysis including frequency analysis, reliability analysis, exploratory factor analysis, correlation analysis, simple regression analysis, and multiple regression analysis. The results of this study were as follows. Firstly, the verbal communication of dance instructors significantly affected customer satisfaction. Secondly, body language, paralanguage, and physical appearance subfactors of the dance instructors’ nonverbal communication, significantly affected customer satisfaction, while spatial language did not. Thirdly, customer satisfaction had a significant impact on long-term relationship intension. Also, the study presented details on discussions and on-site application plans as well as future research opportunities.
주기적으로 회전하는 원봉 주위의 후류에 관한 수치적 연구
백승진,성형진,Baek, Seung-Jin,Seong, Hyeong-Jin 대한기계학회 1998 大韓機械學會論文集B Vol.22 No.3
A numerical study was made of flow behind a circular cylinder in a uniform flow, where the cylinder was rotationally oscillated in time. The temporal behavior of vortex formation was scrutinized over broad ranges of the two externally specified parameters, i.e., the dimensionless rotary oscillating frequency (.110.leq. $S_{f}$.leq..220) and the maximum angular amplitude of rotation (.theta.$_{max}$=15 deg., 30 deg. and 60 deg.). The Reynolds number (Re= $U_{{\inf}D}$.nu.) was fixed at Re=110. A fractional-step method was utilized to solve the Navier-Stokes equations with a generalized coordinate system. The main emphasis was placed on the initial vortex formations by varying $S_{f}$ and .theta.$_{max}$. Instantaneous streamlines and pressure distributions were displayed to show the vortex formation patterns. The vortex formation modes and relevant phase changes were characterized by measuring the lift coefficient ( $C_{L}$) and the time of negative maximum $C_{L}$( $t_{-C}$$_{Lmax}$) with variable forcing conditions.s.tions.s.s.s.
American Milton, Nathaniel Hawthorne
백승진(Seung-Jin Baek) 영미어문학회 2003 영미어문학연구 Vol.19 No.2
본 논문의 목적은 두 남성 작가, 밀튼(John Milton)과 호쏜(Nathaniel Hawthorne)이 각각 「실낙원」(paradise Lost)과 「주홍글씨」(The Scarlet Letter)에서 남녀 양성의 관계를 어떠한 시각에서 바라보고 있느냐를 고찰하는데 있다. 두 작품의 여성 주인공인 이브(Eve)와 헤스터(Haster Prynne)는 남성 작가들에 의해 만들어진 인물들이지만 단순히 전통적 가부장적 사회 구조 속의 힘없는 희생자의 모습은 아니다. 인본주의적 청교도 사상을 가지고 있는 밀튼의 사상은 우주의 질서로부터 이탈한 사회를 건강한 모습으로 되돌리기 위해 양성 사이의 긴밀한 상호 의존과 상호 의무의 내용을 강조하고 있는데, 이브는 이러한 밀튼의 관점을 잘 반영해 주고 있다. 호쏜의 헤스터는 청교도 사회에 의해 부여된 사회 가치를 거부하여 자신을 죄인으로 인정하지 않는다. 이러한 헤스터의 행위는 기존의 사회 질서는 물론 여성에 대한 사회적 편견을 거부하는 행위인데, 호쏜의 헤스터 역시 밀튼의 이브가 보여 주는 것처럼 우주의 질서, 즉 건강한 사회 질서 속에서의 양성의 친밀한 상호 관계를 강조하고 있다.