• 한국기계가공학회지
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• 제13권3호
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• pp.63-69
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• 2014

This paper studies the strength, fatigue sensitivity, safety factor and lifetimes by means of structural and fatigue analyses of different models of rear doors upon the opening of doors and windows leading to severe fatigue fractures of the window motor components of rear doors. The simulation models were a standard model and other models. The other models, which are denoted here as models I and II, were modified versions of the standard model, with a rib of 3mm and a thickness of 2mm as compared to the standard model. The door was modelled with CATIA V5 and analyzed with the ANSYS program. The material of the rear door was cold rolled steel (DDQ). From the study results, the standard model and model I were confirmed to be less safe upon the opening of the door as compared to the opening of a window in terms of fatigue, but model II was found to be safe for both door and window openings.

• 제어로봇시스템학회논문지
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• 제16권6호
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• pp.532-538
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• 2010

SD (Smart Door) is a human friendly power-assisted door system initially targeted for passenger car doors. The Smart Door offers comfort and safety to passengers or/and drivers by supplying additional power. Amount of power supplied by the Smart Door system is depend on the environment where the automotive is situated. It realizes comfort, for example, when the force applied by the passenger to the door is expected to be abnormal, the SD system tries to compensate passenger's effort by supplying additional force. In this study, to enhance the ease of opening and closing the doors of the passenger vehicle, a Smart Door with a power assist mechanism consisting of a motor was developed and analysed. A power assist mechanism mounted within the vehicle's door is designed and modeled for simulation purpose. The required force necessary to control the designed mechanism during the vehicle's roll, pitch and the opening angle of the door has been considered. To this end, we propose a power-assisting control strategy called "gravity cancellation". The system is analysed by numerical simulation with the gravity cancellation control algorithm.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2012년도 추계학술대회 논문집
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• pp.17-18
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• 2012

Generally, speed control system is used to control the elevator door. The whole speed profile must be installed in the speed controller of the door control system. However, it is not easy to modify the speed profile when door opening size and time are changed. In this paper, the making speed profile is discussed by the door opening size and time. The position control algorithms of PMSM for elevator door system are compared with general speed control, position control method with speed controller, and position control with speed command feedforward compensation by simulation using MATLAB/SIMULINK.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2006년도 추계 학술발표회 논문집
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• pp.69-72
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• 2006

The objective of this study is to find out the shear capacity of URM wall and the variables that affect the shear capacity of URM wall such as the opening and the aspect ratio, considering four kinds of failure modes, sliding shear failure, toe crushing failure, and diagonal shear failure. The main varialble is the shape of opening of URM walls. First URM has one door, second has one window, third hase one door and one window, the last has two windows. The test results of URM with openings show that the specimens are governed by rocking failure mode.

• 대한안전경영과학회지
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• 제26권1호
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• pp.15-24
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• 2024

The purpose of this study is to improve the stack effect of the staircase and the failure to take into account the opening of the outside door of the staircase, which are the disadvantages of the existing smoke control only vestibule. As a result of the study, the new vestibule and the staircase simultaneous smoke control are equipped with an exhaust flap damper with an effective opening area of about 0.25 m² in the upper part of the staircase, and a ventilator-type air supply fan of about 5 m³/s in the lower part, and take measures to prevent overpressure in the staircase. If you use the new simultaneous smoke control method of the vestibule and staircase, you can achieve the following effects. First, it is possible to open the external entrance door. Second, it can reduce the stack effect. Third, the staircase door closes automatically without fail. And a new method of preventing overpressure was proposed for the vestibule.

• 한국산학기술학회논문지
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• 제16권2호
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• pp.1516-1523
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• 2015

본 연구는 해상풍력 강재타워의 출입문에 발생되는 응력집중에 대해 상세히 기술하고 있다. 원형강재 풍력타워에는 8종류의 하중조합이 작용하며 그 하중조합은 극한한계상태와 사용한계상태를 고려한 정상 및 이상시 운영상태를 고려하고 있다. 유한요소해석 및 변수연구에 범용해석프로그램인 ABAQUS를 사용하였으며 응력값이 변화되는 곳을 고려하여 변위 및 응력을 검토하였다. 출입문 주변의 응력집중현상을 비교분석하기 위하여 출입문이 없는 경우, 출입문은 없으나 보강재가 있는 경우, 출입문 및 보강재가 모두 적용된 경우로 구분하여 해석연구를 수행하였다. 분석내용은 본문에 자세히 기술하고 있으며, 해석결과 응력집중계수 평균값은 1.47, 최대값은 1.81로 분석되었다.

• 한국화재소방학회논문지
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• 제33권1호
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• pp.30-38
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• 2019

메탄 연료성분이 가득 찬 축소 구획실을 대상으로 개구부에서 유입된 공기와 내부 연료의 혼합특성과 백드래프트 발생특성을 규명하기 위해 대와동모사를 수행하였다. 통상의 문 형태(Door)와 가로 형태의 문이 벽면 상단($Slot_U$), 중단($Slot_M$) 및 하단($Slot_L$)에 있는 구획실의 4가지 개구부 조건들에 대해서 검토를 수행하였다. 점화원이 없을 경우 구획실 내부로 유입되는 산소의 양과 외부로 유출되는 연료의 양은 Door > $Slot_U$ ~ $Slot_M$ > $Slot_L$의 순서로 크지만 $Slot_U$의 경우가 구획실 내부에서 연료와 산소가 전체적으로 가장 잘 혼합되었고 $Slot_L$의 경우에는 연료와 산소가 층을 이루어 혼합이 가장 잘 이루어지지 않는 것으로 나타났다. 구획실 내 산소량과 연료량으로 정의되는 총괄당량비는 구획실에서 발생하는 백드래프트의 강도와 잘 연관되지 않음을 확인하였다. 백드래프트 발생 시의 구획실 내부의 최고 압력은 혼합이 가장 잘 이루어진 $Slot_U$가 가장 높게 나타났으며 $Slot_L$의 경우에는 압력상승이 낮아 백드래프트가 발생하지 않았다. 백드래프트 발생 시 Door와 $Slot_M$ 조건에서의 최고 압력값은 $Slot_U$ 다음 순서로 나타났으며, 각 조건들의 최고압력은 백드래프트 발생순간까지의 총 열발생량과 잘 연관되어 설명될 수 있었다.

• 한국산업정보학회논문지
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• 제11권1호
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• pp.7-12
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• 2006

본 논문은 화재 수신기와 유도등과 연결된 제어부가 화재 탐지 시 무선 신호에 의해 비상문이 자동으로 열리도록 하여, 평상시에는 방범기능을 하고 비상시에는 긴급대피기능도 할 수 있는 방범, 방재용 비상문 자동 개폐시스템을 개발하는데 있다. 이 자동 개폐 시스템은 비상문 개폐에 관한 문제점을 안고 있는 기존의 모든 건물에 사용될 수 있으며, 특히 화재 위험성이 큰 취약대상 건물, 다중 이용업소 등, 특히 옥상 출입문에 대한 관리가 용이하지 못한 아파트 및 고층 건물에 수요가 확산 될 수 있다.

• International Journal of Advanced Culture Technology
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• 제10권3호
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• pp.393-396
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• 2022

Recently, rapid climate change has had a significant impact on the ecosystem of honeybees. In addition, the problem of Vespa Hornets invasion of colonies has a fatal impact on the bee ecosystem, independent of climate change. Especially in late summer. This study relates to a method for preventing Vespa Hornets attack. In this study, we developed a Vespa Hornets sound detection device was developed by collecting and analyzing the sound of a Vespa Hornets and applying IoT technology. The developed device detects the sound of a Vespa Hornets when Vespa Hornets appears around the hive of the bees and sends a signal to automatically close the door of the beehive. The device that receives the signal drives the motor that controls the honeycomb door to close the beehive door. The Vespa Hornets sound detection device operates until no Vespa Hornets sound is detected. The system developed by us is expected to be installed in the beehives of actual beekeeping farms to dramatically reduce the damage caused by by Vespa Hornets.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2004년도 춘계학술대회 논문집
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• pp.1510-1512
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• 2004

Platform Screen Door System is a facility on platform to separate platform from track, having automatic sliding door structures interlocked to opening and closing of train door with integrated control unit. When a train comes to a stop at a designed position at a station, onboard ATC/ATO system transmits train berth signal to wayside signaling system. In case of automatic/driverless operation, opening and closing of the Platform Screen Door will be controlled by wayside signaling system. Unfortunately, we often see the case in news that passengers fall into track and their contact with train lead to critical accidents. However, passengers will be free from such accidents on the platform with the Platform Screen Door System. Especially during the rush hours, to ensure passenger's safety and smooth getting on & off, it is necessary to arrange. some station staffs on the platform without the Platform Screen Door System. On the other hand, the Platform Screen Door System will realize such operation by fewer staffs. Due to the above reasons, the Platform Screen Door System is becoming more popular in subway system recently.