• 환경영향평가
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• 제20권2호
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• pp.175-185
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• 2011

It is usual for energy consumption in accordance with facing and sitting direction of tower-type apartments to be calculated by the official statistics or computer simulation. Previous studies for energy consumption appear to be very limited due to the dependence on flat type of apartment. Acknowledging these constraints, an empirical study for a tower type apartment was conducted to demonstrate how a on-site indoor temperature measurement in spring can be used to assist in estimating the total energy consumption in terms of facing and sitting orientation specific settings. The results indicate that maximum temperature difference in spring was identified as $1.16^{\circ}C$ between south and eastern direction. It is known that raising $1^{\circ}C$ indoor temperature require 7% more energy consumption than normal. The $1.16^{\circ}C$ difference means that sitting direction of tower type apartment is a crucial explanatory variable as unit of analysis for energy consumption. It was demonstrated that the indoor temperature could be used effectively as an indicator to estimate energy consumption among various sitting direction of tower type apartments. It is anticipated that this research output could be used as a valuable reference to support more scientific and objective decision-making for facing and sitting orientation of tower type apartments.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2009년도 춘계학술대회 논문집 특별세미나,특별/일반세션
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• pp.379-384
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• 2009

It is of great importance to assure the running safety and ride comfort in designing the floating slab track for the mitigation of train-induced vibration. In this paper, for this, analyzed are the system requirements for the running safety and ride comfort, and then, the behavior of train and track at the transition zone between the floating slab track and the conventional concrete slab track according to several main design variables such as spring constant, damping coefficient, spacing and arrangement of isolators and slab length, using the dynamic analysis technique considering the train-track interaction. The results of numerical analysis demonstrate that the discontinuity of the support stiffness at the transition results in a drastic increase of the vertical vibration acceleration of the train body, wheel-rail interaction force, rail bending stress and uplift force. The increase becomes higher with the decrease of the spring constant of isolators and the increase of the isolator spacing, but the damping ratio does not significantly affect the behavior of train and track at the transition. Therefore, to assure the running safety and ride comfort, simultaneously increasing the effectiveness of vibration isolation, it is effective to minimize the relative vertical offset between the floating slab and the conventional track slab by adjusting the spring constant and spacing of isolators at the transition.

• 한국안전학회지
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• 제31권5호
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• pp.67-73
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• 2016

This study investigates the seismic performance of the surge tank which is of the atmospheric type and constructed above the ground. For that purpose, three different numerical models of the surge tank have been taken into account. Two models are constructed to describe the surge tank with different support conditions: one is to model all supports as fixed, and the other is to use spring element for the rock conditions. The third model is constructed to describe not only the surge tank with spring element of the rocks but also the vertical waterway tunnel. Through the time-history analysis of the surge tank subjected to three artificially excited ground motions, it is demonstrated that there can be much difference between the three models of our interest according to the support conditions and inclusion of the vertical waterway tunnel. However, their seismic performances still remain below the safety criteria, i.e., dynamic allowable stress. Also, the numerical results let us know where the critical sections occur. These results could be used to develop the efficient seismic enhancement method for the surge tank.

• 한국항공우주학회지
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• 제31권9호
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• pp.38-45
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• 2003

본 논문은 Strain Energy Hinge(SEH)를 갖는 다목적 2호기의 태양전지판 전개에 대한 동적 모델링과 관련이 있다. 이 연구를 위해 SEH는 단순한 비틀림 스프링으로 치환되었으며 인공위성과 태양전지판은 강체로 가정하고 운동방정식을 유도하였다. 또한 모델링에 지상 실험에 가장 큰 영향을 주고 있는 것으로 관찰된 지지줄의 영향을 고려하였다. 무중력 상태에서의 전개와 지상 전개 결과를 비교한 결과 태양전지판의 전개는 유사하나 인공위성의 운동은 지지줄의 영향으로 인해 전혀 다른 것으로 나타났다. 결론적으로 지상 전개 실험 장치를 이용해 무중력 상태의 태양전지판 전개를 어느 정도 정확하게 묘사할 수 있다. 또한 지지줄의 영향을 조사한 결과 현재 실험실의 지지줄의 길이가 적합한 것으로 나타났다. 지상실험 결과와의 비교는 다음 논문에서 다룬다.

• 한국방재학회 논문집
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• 제8권3호
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• pp.11-21
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• 2008

여러 가지 하중을 받는 임의의 탄성 경계 지지된 판과 쉘의 기하학적 선형 및 비선형해석을 수행하였다. 가정변형률 9절점 쉘 요소를 이용하였으며, 임의의 탄성 경계 지지를 표현하기 위해 6개의 자유도를 갖는 스프링 요소가 사용되었다. 탄성 경계지지 구조물 해석의 응용을 위하여, 여러 형태의 단부 지지를 받는 판과 쉘이 분석되었으며, 이들 단부 지지에 대한 휨 거동을 정확히 얻을 수 있었다. 6개의 스프링으로 표현된 탄성 경계 지지 조건에 대하여 적절한 결과를 얻을 수 있었다. 해석 결과로부터 본 연구의 해석 방법이 임의의 탄성 경계 조건을 갖는 판과 쉘의 거동을 해석하는데 폭넓게 사용될 수 있음을 알 수 있었다.

• 한국주거학회:학술대회논문집
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• 한국주거학회 2005년도 추계학술대회 논문집
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• pp.171-175
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• 2005

The purpose of this study was to suggest the Support and Infill system for 126.6m$^2$-sized housing unit which meets residents' variety. The subjects were 100 housewives who lived in 126.6m$^2$-sized housing unit in the apartment complex, Busan. The data was collected by using model and questionnaire. The model was made to be same as the current 126.6m$^2$-sized floor plan. The residents preferred the flexible housing unit apartment complex. Also, the residents' needs for floor plan of housing unit were various. Therefore, the development of flexible housing unit is needed. On the basis of these findings, the support and infill system for 126.6m$^2$-sized housing unit was suggested.

• 문화기술의 융합
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• 제9권6호
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• pp.1057-1063
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• 2023

본 연구대상인 도시철도 침목플로팅궤도(STEDEF)는 구조물로 전달되는 진동을 저감시키기 위한 방진궤도이다. 현재 침목플로팅궤도의 침목방진패드 교체주기(정적 스프링강성 변화율, 25±2%)는 하중기반(궤도충격계수와 궤도지지강성)으로 설정되어 운영중인 실정이다. 그러나 대부분의 선행연구는 침목방진패드의 피로수명평가와 스프링강성 증가에 따른 궤도충격계수 및 궤도지지강성의 증가 등 하중기반의 구조적 안전성 측면의 연구가 진행되었다. 따라서 본 연구에서는 분석 구간별 도상 진동가속도를 측정하고 700만회 피로시험결과를 이용하여 구간별 침목방진패드 스프링강성을 산출하고자 한다. 구간별 산출한 침목방진패드 스프링강성을 해석제원으로 설정하여 도상 진동가속도를 해석적으로 도출하였다. 구간별 해석 도상 진동가속도가 현장측정 도상 진동가속도 범위 이내로 나타나 해석모델링의 적정성이 검증되었다. 도출된 스프링강성 변화에 따른 진동가속도 선도(g-k curve)를 이용하여 측정 도상 진동가속도로 침목방진패드 스프링강성을 추정하고자 한다. 따라서 측정 도상 진동가속도를 이용한 운행선로의 침목방진패드 스프링강성을 추정할 수 있는 기법을 제시하고자 한다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2009년도 추계학술대회 논문집
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• pp.816-816
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• 2009

In order to attenuate structural waves in railway track, damped mass-spring absorber system and spring supported system are considered that are attached continuously along the beam length. A mathematical model is presented for the propagation of structural waves on a finitely long, periodically supported classical beam. The model in this paper could represent a railway track where the beam represents the rail and an appropriately chosen support type represents the pad/sleeper/ballast system of a railway track. And in this study, it is presented that the measurement method of health monitoring of railway track.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 1991년도 추계학술발표회 논문집 지반공학에서의 컴퓨터 활용 COMPUTER UTILIZATION IN GEOTECHNICAL ENGINEERING
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• pp.289-311
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• 1991

Analysis of supported excavation system by Elasto-Plastic Isoparametric Finite Element Method and Elasto-Plastic Beam Method have been conducted for the simulation of stepwise underground excavation. Conventional methods, fixed Supported Beam and Spring Supported Beam method, also have been examined and compared with the results of elasto-plastic beam method and field data. Except unavoidable result of upward ground settlement near the top of retaining wall and relatively high bending moment of wall at each excavation level, satisfactory results have been derived using elasto-plastic isopara metric finite element method. The results from elasto-plastic beam analysis program, developed by the author, are proved to be fit field data in acceptable variance as shown in the paper. Displacement and bending moment, of the wall by conventional methods, both fixed supported beam and spring supported beam, are always underestimated than field data, and attention must be given that the diffence increases with deeper excavation depth and lower horizontal subgrade reaction of the ground.

• 한국소음진동공학회논문집
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• 제21권3호
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• pp.264-270
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• 2011

This paper deals with dynamic response of a beam structure with discrete spring-damper supports under a moving mass. Governing equations of motion taking into account of all inertia effects of the moving mass were derived by Galerkin's mode summation method, and Runge-Kutta integration method was applied to solve the differential equations. The effects of the speed of the moving mass, spring stiffness, damping coefficient, span number of a beam structure, mass ratio of the moving mass on the dynamic response of the beam structure have been studied. Some numerical results provide design engineers for the beam structure design with discrete supports under a moving mass.