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申基弘 여수대학교 1992 論文集 Vol.6 No.-
This paper describes the formulation for the analysis of the flexural free vibration of rectangular plate structure by the transfer matrix method, which was developed on the base of the concept of the successive transmission of state vector. For the analysis of rectangular plate which two opposite sides were supported edge condition, the results of simple numerical examples demonstrated the validity for algorithm of the present method, that is, the numerical high accuracy and the flexibility for programming, compared with results of exact solution or Leissa's method. It was confirmed that the algothrim by the transfer matrix method suggested in this study could be applied for systems with a large number of intermediate supports. And it could be easily treated the intermedite support conditions and all boundary conditions by adequately controlling the values of spring constants.
신기홍,김경식,이준호,민승식,장기호 한국물리학회 2018 새물리 Vol.68 No.2
We investigate the dynamical behaviors of the microscopic and the mesoscopic community structures in co-author networks. Two types of data in this study are extracted from author weights in the talk and the poster sessions of the Korean Meteorological Society and the papers published in New Physics: Sae Mulli of the Korean Physical Society. The community structure, by using the theoretical methods of quantum and classical oscillators, can be connected non-trivially to two agents with changes of the temperature. As the temperature increases to a higher value, we simulate and analyze the communicability functions, the number of communities, the difference in communities, and the modularity. We may provide some important results giving evolutionary information obtained from the computer-simulation of community structures. 본 연구에서는 저자 네트워크에서 미시적 및 중시적 사회구조의 동역학적 거동을 연구한다. 이러한 연구의 두가지 데이터는 한국물리학회의 새물리 발표논문과 한국기상학회의 발표회의에서 저자들의 논문가중치로부터 추출한 것이다. 양자진동자와 고전진동자의 이론적 방법에 의한 사회구조는 각각 온도의 변화에서 두 대리인들 사이에 자명하지않게 연결되어 나타난다. 온도가 높은 값으로 증가함에 따라 사회성 함수, 사회수, 사회성의 차이 및 이에 따른 모듈성을 컴퓨터흉내내기를 통하여 분석한다. 본 논문의 결과로부터 사회구조의 진화정보에 대한 중요한 사실들을 제공할 수 있을 것으로 사료된다.
申基弘 여수대학교 1991 論文集 Vol.5 No.-
For the improvement of the marine engine maintenance, we need their best working with honesty of the peaple in this field as well as closed and powerfull government support. In particular, engineer, who are on duty for the engine operation of the ship during her sailing, have to understand maintenance, trouble with it's repair and efficient operating way of the engine in order to have successful engine managine, prolong engine life and economic opreating. So, they can contribute to develop and inprove of maintenanee with safe sailing of the ship.
Realization of the Real-time Time Domain Averaging Method using the Kalman Filter
신기홍 한국정밀공학회 2011 International Journal of Precision Engineering and Vol.12 No.3
Time Domain Averaging (TDA) is a traditional (though powerful) method of extracting periodic signals from a composite signal, based on averaging signal sections of the period chosen. The TDA method has been widely used for the condition monitoring of rotating machinery as a pre-process. However, the averaging process requires the measured data to be recorded, and thus may not be easily implemented as a real-time (or on-line) processor. This paper presents an alternative method of performing the TDA that can easily be realized as a real-time averaging processor by using the Kalman filter. The suggested method has another advantage over the traditional TDA method, which is to monitor the variance reduction continuously as the averaging process evolves. This may help to determine whether the averaging is further needed or not. The method is verified by using both simulated data and a measured signal.
신기홍(Kihong Shin) 한국자동차공학회 2004 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
A two-degree-of-freedom out-of-plane model with contact stiffness is presented to describe dynamical interaction between the pad and disc of a disc brake system. It is assumed that the out-of-plane motion of the system depends on the friction force acting along the in-plane direction. Dynamic friction coefficient is modelled as a function of both in-plane relative velocity and out-of-plane normal force. When the friction coefficient depends only on the relative velocity, the contact stiffness has the role of negative stiffness. The results of stability analysis show that the stiffness of both pad and disc are equally important. Complex eigenvalue analysis is conducted for the case that the friction coefficient is also dependent on the normal force. The results further verify the importance of the stiffness. It has also been found that increasing the gradient of friction coefficient with respect to the normal force makes the system more unstable. Nonlinear analysis is also performed to demonstrate various responses. Comparing the responses with experimental data has shown that the proposed model may qualitatively well represent a certain type of brake noise.
신기홍 외 전남대학교 수산과학연구소 2014 수산과학연구소논문집 Vol.22 No.-
This study was carried out to find a way to sustain and preserve salt marshes of Suncheon Bay, on the basis of comprehensive field data such as weather, tide, tidal current, SS and sediment. Temporal and spatial variations in the flow were examined in terms of numerical experiments by EFDC(Environmental Fluid Dynamics Code) model. It turned out that a semidiurnal tide is predominant since the tide form ratio ranges from 0.23 to 0.25. Also, Suncheon Bay revealed the flow to be relatively weak in the intertidal zones whereas it revealed the flow to be strong in the waterways. Thus, the result of this study proved to fairly reflect real flow conditions in Suncheon Bay so that it is expected to be helpful to effectively sustain and preserve salt marshes of Suncheon Bay.