• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2006년도 하계학술발표대회 논문집
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• pp.903-908
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• 2006

Building energy simulation has become a useful tool for predicting cooling, heating and air-conditioning loads for facilities. It is important to provide building energy performances feed back to the mechanical and electrical system operator and engineer for energy conservation and maintenance of building. From this research, we set up the typical weather data of location, basic description of building, geometric modelling data and the specification of Installed primary HVAC system for establishing the simulation model about energy consuming that take place in multipurpose building complex. The simulation tool of building energy - EnergyPlus (DOE and BLAST based simulation S/W), it has been used and accomplished calculations and analyses for evaluating the effect of the system types and operating condition of central HVAC plant on the building energy consumption. In this paper, we offer comparison and simultaneous results those involve electricity consumption pattern and amount between actual operation versus EnergyPlus simulation to the object building during summer season.

• 한국수자원학회논문집
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• 제51권7호
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• pp.555-564
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• 2018

홍수조절지는 하천 제내지 측에 제방을 축조하고 제방 일부 구간에 횡월류위어를 설치해 일정규모 이상의 홍수사상 발생 시 홍수량 일부를 월류시켜 저류하는 홍수저감시설이다. 다양한 하천시설물이 존재하는 하천 내에서 홍수조절지의 운영 최적화를 위해서는 기존 시설과의 연계 운영을 함께 검토해야 할 필요가 있다. 본 연구에서는 하도 내 수문 시설의 영향을 고려해 홍수조절지 횡월류위어의 위치 변화에 따른 수로 내 수위 저감 및 유량 분담 효과를 분석하였다. 수문 시설의 영향을 고려하기 위해 수로 내 2문의 방사형 수문을 설치하였으며, 수문으로부터 상류 방향으로 횡월류위어의 위치를 이동시키며 수로 내 수위 변화와 횡월류위어의 월류량을 측정하였다. 실험 결과 횡월류위어의 위치가 수문에 가까울수록 수위 저감 효과가 크게 나타났으며, 유량 분담 효과는 큰 변화가 없는 것으로 확인되었다. 2개소 이상의 횡월류위어 운영 시에는 충분한 저류공간이 확보되어 횡월류위어의 위치에 따른 수위 저감 효과의 변화가 크지 않은 것으로 확인되었다. 또한, 수문 운영 시 1개소 횡월류위어의 위치 변화에 따른 수위 저감율을 경험식으로 산정해 향후 홍수조절지 계획 시 활용 가능한 기초자료를 제공하고자 한다.

• Smart Structures and Systems
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• 제16권6호
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• pp.1023-1047
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• 2015

In this study, the optimal location of the MR fluid segments in a partially treated laminated composite sandwich plate has been identified to maximize the natural frequencies and the loss factors. The finite element formulation is used to derive the governing differential equations of motion for a partially treated laminated composite sandwich plate embedded with MR fluid and rubber material as the core layer and laminated composite plate as the face layers. An optimization problem is formulated and solved by combining finite element analysis (FEA) and genetic algorithm (GA) to obtain the optimal locations to yield maximum natural frequency and loss factor corresponding to first five modes of flexural vibration of the sandwich plate with various combinations of weighting factors under various boundary conditions. The proposed methodology is validated by comparing the natural frequencies evaluated at optimal locations of MR fluid pockets identified through GA coupled with FEA and the experimental measurements. The converged results suggest that the optimal location of MR fluid pockets is strongly influenced not only by the boundary conditions and modes of vibrations but also by the objectives of maximization of natural frequency and loss factors either individually or combined. The optimal layout could be useful to apply the MR fluid pockets at critical components of large structure to realize more efficient and compact vibration control mechanism with variable damping.

• Structural Engineering and Mechanics
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• 제17권3_4호
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• pp.573-591
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• 2004

A hybrid control system is presented for seismic-resistant building structures with and without soil-structure interaction (SSI). The hybrid control is a damper-actuator-bracing control system composed of passive and active controllers. An intelligent algorithm is developed for the hybrid system, in which the passive damper is designed for minor and moderate earthquakes and the active control is designed to activate when the structural response is greater than a given threshold quantity. Thus, the external energy for active controller can be optimally utilized. In the control of a multistory building, the controller placement is determined by evaluating the optimal location index (OLI) calculated from six earthquake sources. In the study, the soil-structure interaction is considered both in frequency domain and time domain analyses. It is found that the interaction can significantly affect the control effectiveness. In the hybrid control algorithm with intelligent strategy, the working stages of passive and active controllers can be different for a building with and without considering SSI. Thus SSI is essential to be included in predicting the response history of a controlled structure.

• Structural Engineering and Mechanics
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• 제31권6호
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• pp.679-696
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• 2009

The paper aims at analyzing the stress distribution around an underground opening that is subjected to non-symmetrical surface loading with emphasis on opening shapes with sharp corners and the stress concentrations developed at these locations. The analysis is performed utilizing the BIE method coupled with the Neumann's series. In order to implement this approach, the special recurrent relations for half plane were proven and the modified Shanks transform was incorporated to accelerate the series convergence. To demonstrate the capability of the developed approach, a horseshoe shape opening with sharp corners was investigated and the location and magnitude of the maximum hoop stress was calculated. The dependence of the maximum hoop stress location on the parameters of the surface loading (degree of asymmetry, size of loaded area) and of the opening (the opening height) was studied. It was found that the absolute magnitude of the maximum hoop stress (for all possible surface loading locations) is developed at the roof points when the opening height/width ratio is relatively large or when the pressure loading area is relatively narrow (compared to the roof arch radius), and contrarily, when the opening height/width ratio is relatively small or when the surface pressure is applied to a relatively wide area, the absolute magnitude of the maximum hoop stress is developed at the bottom sharp corner points.

• Structural Engineering and Mechanics
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• 제20권3호
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• pp.313-334
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• 2005

The paper presents a new approach for the analysis of slope stability that is based on the numerical solution of a differential equation, which describes the thrust force distribution within the potential sliding mass. It is based on the evaluation of the thrust force value at the endpoint of the slip line. A coupled approximation of the slip and thrust lines is applied. The model is based on subdivision of the sliding mass into slices that are normal to the slip line and the equilibrium differential equation is obtained as the slice width approaches zero. Opposed to common iterative limit equilibrium procedures the present method is straightforward and gives an estimate of slope stability at the value of the safety factor prescribed in advance by standard requirements. Considering the location of the thrust line within the soil mass above the trial slip line eliminates the possible development of a tensile thrust force in the stable and critical states of the slope. The location of the upper boundary point of the thrust line is determined by the equilibrium of the upper triangular slice. The method can be applied to any smooth shape of a slip line, i.e., to a slip line without break points. An approximation of the slip and thrust lines by quadratic parabolas is used in the numerical examples for a series of slopes.

• Smart Structures and Systems
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• 제15권5호
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• pp.1215-1232
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• 2015

In the present paper, a method for identifying damage in a multi storeyed shear building structure is presented using minimum number of modal parameters of the structure. A damage at any level of the structure may lead to a major failure if the damage is not attended at appropriate time. Hence an early detection of damage is essential. The proposed identification methodology requires experimentally determined sparse modal data of any particular mode as input to detect the location and extent of damage in the structure. Here, the first natural frequency and corresponding partial mode shape values are used as input to the model and results are compared by changing the sensor placement locations at different floors to conclude the best location of sensors for accurate damage identification. Initially experimental data are simulated numerically by solving eigen value problem of the damaged structure with inclusion of random noise on the vibration characteristics. Reliability of the procedure has been demonstrated through a few examples of multi storeyed shear structure with different damage scenarios and various noise levels. Validation of the methodology has also been done using dynamic data obtained through experiment conducted on a laboratory scale steel structure.

• 해양환경안전학회지
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• 제13권3호
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• pp.235-240
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• 2007

최근 에너지 절약형 건물에 많은 관심을 기울이고 있으며, 이를 위해 보냉, 보온의 단열재 등의 건축재료 개발이 많이 이루어지고 있다. 이와 더불어 건물 내외의 온도와 밝기는 햇볕의 밝기, 위치 및 기후변화에 따라 많은 영향을 끼치므로 자연채광에 따른 건물의 위치는 건물을 짓는데 있어서 고려해야할 중요한 변수이다. 본 논문에서는 자연채광과 비슷한 조건을 만들어 모델링하기 위해 반구형의 돔으로 된 원형 지붕에 자연채광의 역할을 하는 342개의 백열전구를 인공채광으로써 설치하였다. 특히 여기서는 각 백열전구의 밝기제어에 관한 것을 중점적으로 다루고 있으며, 다수의 PIC 마이크로프로세서와 트라이악을 이용한 위상제어로 전구의 밝기를 제어한 실험결과를 제시하고 있다.

• 한국지형공간정보학회:학술대회논문집
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• 한국지형공간정보학회 2002년도 추계학술대회
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• pp.133-140
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• 2002

본 논문에서는 다양한 건물 지붕의 검출에 사용될 수 있는 선소의 그룹화 기법을 제안한다. 먼저 에지 보존 필터를 사용하여 영상에 포함된 잡음을 제거한 후에 watershed 기법을 이용하여 에지의 위치를 보존하고 영상 분할을 수행한다. 분할된 영역의 경계선에 위치한 화소들의 곡률을 계산하여 control point를 검출하고 control point 사이의 선소를 추출한다. 추출된 선소들의 방향과 길이를 고려하여 선소의 연결을 수행하고 최종적으로 화소의 그레디언트 크기를 이용하여 선소의 위치를 조정한다. 항공 영상에 제안한 방법을 적용하여 건물 지붕을 정확하게 검출할 수 있음을 보였다.

• 한국주거학회논문집
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• 제18권6호
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• pp.35-44
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• 2007

The purpose of this paper is to find out the factors affecting the apartment price given three sets of variables such as characteristics of apartment building, apartment site, and location. Data of 1,579 housing units in 224 apartment complex sites in Ilsan city were selected from the housing information of four public and private housing sources in 2006. The first set of variables for physical features include housing size (pyoung), preferring-floor, building orientation, heating system and structure of entrance. The second set of variables for building were number of housing units, built year and rank of construction company. The third set of variables for location were distance from number of school, the subway station, distance of department store and park. For the analysis, the hedonic price model, which was one of the methods to estimate social convenience, was used along with the SPSS statistical program and regression analysis. The results are as follows, Firstly, in the structural characteristic variables, it was analyzed that all of the variables except facing affected the apartment price. Secondly, In the site characteristic variables, unusually all of the variables were not affected the apartment price in Ilsan city. Finally, the locational characteristic variables number of school, the subway station, distance of department store and park affected the apartment price. In case of Ilsan city, educational facilities was likely to positively contribute to the price of apartment.