• 설비공학논문집
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• 제15권1호
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• pp.67-72
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• 2003

The aim of this paper is to investigate the laws of building service system among the laws of construction and to show alternative proposals against the problems. The result of this paper is to simplify the construction laws which will reduce construction administration complexity and to increase productivity of construction works. Among the construction laws, we must revise mechanical engineers' role because of increasing mechanical system's importance than before. Through this study the author will show the improvement of building service system technology and the quality of construction industry.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2006년도 하계학술발표대회 논문집
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• pp.1250-1254
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• 2006

The aim of this paper is to analysis mechanical system flaw in apartment building service system. From this paper, most mechanical flaws are from design mistake, materials flaw, other engineering construction's negligence of construction execution and careless system operation management. Through this study, the author suggested the way to reduce mechanical flaw, during construction process from drawing survey before execution start to completion of construction.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2006년도 하계학술발표대회 논문집
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• pp.548-553
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• 2006

The aim of this paper is to analysis mechanical system flaw in building service system construction. From this paper, most mechanical flaws are from design mistakes, material flaws, other engineering construction's negligence of construction execution and careless system operation managements. Through this study, the author suggested the way to reduce mechanical flaw, during construction process from drawing survey before execution start to completion of construction.

• 대한기계학회논문집A
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• 제34권8호
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• pp.1023-1028
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• 2010

최근에, 서비스용 지능형 로봇이 공공기관에서 방문객들에게 건물을 안내하고 정보를 제공하는데 사용되어지고 있다. 이 로봇은 지면 위치 인식 방식의 센서를 가지며 마름모형태의 네 바퀴로 스스로를 지탱한다. 로봇의 작동은 구동부분과 내부 구조가 하나의 결합된 몸체로 구성되어 있기 때문에 고르지 못한 장소에서는 제한을 받는다. 이와 같은 상태가 지속되면 로봇의 정밀한 부분에서 이상 징후가 발견 될 것이고, 각각의 연결 부위가 약화 될 것이다. 따라서 로봇의 동역학 모델이 만들어 졌고, 서스펜션과 함께 구동 특성들을 위한 모의실험도 이루어 졌다. 이 서스펜션 시스템은 로봇의 각 부분에 미치는 충격들을 줄이는데 최적화 되었다.

• 대한기계학회논문집A
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• 제36권11호
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• pp.1433-1439
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• 2012

본 논문에서는 Building Energy Management System(BEMS) 구현을 위해 "재실자의 위치 및 인원정보" 에 기반을 둔 실내 위치 기반 서비스 및 그를 위한 센서 시스템에 대하여 제안한다. 본 논문에서 제안한 센서 시스템에는 열에너지 그 자체를 감지 할 수 있는 서모파일 센서와 비 접촉 방식으로 대상까지의 거리를 얻어낼 수 있는 초음파센서, 그리고 이를 제어하고 구동할 수 있는 기구 및 동작부가 포함된다. 본 시스템은 적절한 크기의 방 전체를 감시할 수 있도록, $360^{\circ}$ 회전과 틸팅이 가능한 구조로 되어있어, 실내공간내의 재실자의 인원 및 위치를 동시에 파악할 수 있다. 또한 무선통신 기술인 블루투스 모듈을 통해 빌딩 관리자나 스마트 홈 서버와의 통신이 가능하도록 되어 있어, 빌딩내의 조명이나 공조시스템을 자동으로 제어, 관리하게 함으로써 전체 에너지 절약을 가능케 한다. 마지막으로 측정 데이터 검증을 위한 실환경 실험을 통해, 본 연구에서 제안한 시스템의 효용성 및 타당성을 확인한다.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2008년도 추계학술대회A
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• pp.565-570
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• 2008

Recently, the intelligent service robot is applied for the purpose of guiding the building or providing information to the visitors of the public institution. The intelligent robot which is on development has a sensor to recognize its location at the bottom of it. Four wheels which are arranged in the form of a lozenge support the weight of the components and structures of the robot. The operating environment of this robot is restricted at the uneven place because the driving part and internal structure is designed in one united body. The impact from the ground is transferred to the internal equipments and structures of the robot. This continuous impact can cause the unusual state of the precise components and weaken the connection between each structural part. In this paper, a suspension system which can be applied to the intelligent robot is designed. The dynamic model of the robot is created, and the driving characteristics of the actual robot and the robot with suspension are compared. The road condition which the robot can operate is expanded by the application of the suspension system. Additionally, the suspension system is optimized to reduce the impact to the robot components.

• 한국안전학회지
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• 제21권2호
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• pp.46-51
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• 2006

The smoke exhaust system is one of the effective systems to save lives when fire occurs underground. This study presents a complete analysis of effective smoke exhaust and smoke characteristics for a fire occurring with a transverse ventilation system use as a smoke exhaust system. The performance of the smoke management system was studied by computer modeling using FDS version 3.1. A fire size of 20MW was used for tunnel with balanced exhaust transverse ventilation. The smoke management design and the procedure as simulated in this study are also compliant to the tunnel construction and fire codes of Korea.

• Geomechanics and Engineering
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• 제28권6호
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• pp.585-598
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• 2022

The monopile-friction wheel hybrid foundation is an innovative solution for offshore structures which are mainly subjected to large lateral eccentric load induced by winds, waves, and currents during their service life. This paper presents an extensive numerical analysis to investigate the lateral load and moment bearing performances of hybrid foundation, considering various potential influencing factors in sand-overlaying-clay soil deposits, with the complex lateral loads being simplified into a resultant lateral load acting at a certain height above the mudline. Finite element models are generated and validated against experimental data where very good agreements are obtained. The failure mechanisms of hybrid foundations under lateral loading are illustrated to demonstrate the effect of the friction wheel in the hybrid system. Parametric study shows that the load bearing performances of the hybrid foundation is significantly dependent of wheel diameter, pile embedment depth, internal friction angle of sand, loading eccentricity (distance from the load application point to the ground level), and the thickness of upper sandy layer. Simplified empirical formulae is proposed based on the numerical results to predict the corresponding lateral load and moment bearing capacities of the hybrid foundation for design application.

• 한국지진공학회논문집
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• 제24권3호
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• pp.123-128
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• 2020

Analysis of the 2016 Gyeongju earthquake and the 2017 Pohang earthquake showed the characteristics of a typical high-frequency earthquake with many high-frequency components, short time strong motion duration, and large peak ground acceleration relative to the magnitude of the earthquake. Domestic nuclear power plants were designed and evaluated based on NRC's Regulatory Guide 1.60 design response spectrum, which had a great deal of energy in the low-frequency range. Therefore, nuclear power plants should carry out seismic verification and seismic performance evaluation of systems, structures, and components by reflecting the domestic characteristics of earthquakes. In this study, high-frequency amplification factors that can be used for seismic verification and seismic performance evaluation of nuclear power plant systems, structures, and equipment were analyzed. In order to analyze the high-frequency amplification factor, five sets of seismic time history were generated, which were matched with the uniform hazard response spectrum to reflect the characteristics of domestic earthquake motion. The nuclear power plant was subjected to seismic analysis for the construction of the Korean standard nuclear power plant, OPR1000, which is a reactor building, an auxiliary building assembly, a component cooling water heat exchanger building, and an essential service water building. Based on the results of the seismic analysis, a high-frequency amplification factor was derived upon the calculation of the floor response spectrum of the important locations of nuclear power plants. The high-frequency amplification factor can be effectively used for the seismic verification and seismic performance evaluation of electric equipment which are sensitive to high-frequency earthquakes.

• 한국화재소방학회논문지
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• 제24권2호
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• pp.133-138
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• 2010

최근 건축물이 대형화, 복잡화되면서 건축물내 거주자의 피난안전성이 관심의 초점이 되고 있다. 국내 건축물은 용도에 따라 관계법령에 의한 배연창 또는 기계적 배연설비를 설치하도록 규정되어 있다. 화재시 거주자의 피난안전성을 확보하기 위하여 화재실의 제연이 매우 중요하다. 본 연구에서는 배연창 크기의 변화와 스프링클러 설비의 작동이 화재실 연기층 높이와 온도 조건에 미치는 영향을 화재 시뮬레이션프로그램인 CFAST를 이용하여 평가 하였다. 연구결과 배연창 면적이 증가할수록 5MW 화재 크기 이하에서는 연기층 높이와 온도에 미치는 효과가 증가하나 화재크기가 10MW 이상 커지면 배연창의 면적과 연기배출 효과와의 상관성이 떨어진다. 스프링클러 설비가 작동하고 배연창이 열릴 경우에는 화재크기와 상관없이 인명안전기준이 만족되었다. 법규에 의한 일률적인 배연창 면적의 적용보다는 건축물의 용도 및 규모에 따라 화재시나리오를 선정하고 시나리오에 따른 화재 크기에 따라 적절한 크기의 배연창을 적용하여야 하며 실제 실험이나 시뮬레이션을 통한 검증이 이루어져야 한다.