http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
서희원,안재홍,최동호,Seo. Hee Won,An. Jae Hong,Choi. Dong Ho 한국방재학회 2013 한국방재학회논문집 Vol.13 No.5
화재시 건물내의 화재확산방지를 위해서 개구부에는 방화문이 설치된다. 외국에서는 방화문이 설치되는 부위의 내화성능 등을 고려하여 20분~180분의 방화문을 구분하여 적용하고 있으나, 국내에서는 일률적으로 1시간의 차염 성능만을 적용토록 하고 있어 화재시 충분한 화재확산방지를 기대하기 어렵다. 이에 국내에서도 방화문이 적용되는 위치에 따라 요구되는 내화성능을 강화하고, 차열성능을 확보토록 제도를 개선하여야 할 필요성이 있으며, 이를 위해서는 기존 방화문의 성능 검증이 선행되어야 한다. 이에 본 연구에서는 제도 개선을 위한 기초자료로 활용하기 위하여 방화문으로 널리 사용되는 철제 방화문의 코어재 종류에 따른 내화성능을 평가하였으며 대부분의 시험체가 차염 성능을 확보하고, 코어재에 따라 10분 안팎의 차열 성능을 확보하고 있음을 확인하였다. Fire doors are installed on the openings in buildings to protect fire spreading in the event of fire. In foreign countries, fire doors whose fire resistance performance is from 20 minutes to 180 minutes are installed depending on required fire resistance performance of where fire doors are installed. But, in Korea, it is difficult to protect fire spreading in the event of fire because fire doors only having integrity of 1 hour are installed regardless of the position of fire doors. Therefore, it is needed to improve the system related to fire doors by strengthening the required fire resistance performance depending on where fire doors are installed and introducing insulation performance. To do so, the performance verification of the existing fire doors must be done first. In this study, fire resistance performance of the steel fire doors which are used widely depending on core material was evaluated. As a result, most specimens had the integrity performance and secured insulation performance of around 10 minutes depending on core material.
물류시설 방화셔터의 복사열로 인한 화재확산 가능성에 관한 연구
서희원(Heewon Seo),이상범(Sangbum Lee),김대회(Daehoi Kim),이길용(Gilyong Lee) 한국방재학회 2023 한국방재학회논문집 Vol.23 No.6
물류시설의 방화구획을 형성하는 주된 방화구획 설비인 방화셔터의 화재 시 복사열 영향에 의한 수용물품(골판지 박스 등) 착화 등 화재확산 가능성을 확인하기 위하여 목업 실험을 실시하였다. 실험 결과, 방화셔터로부터 1 m, 2 m, 3 m 이격거리에 있는 수용물품은 화재 시 방화셔터의 복사열에 의한 착화가 가능하여 화재확산에 영향을 줄 수 있는 것으로 나타났다. 따라서, 물류시설에서 화재 시 이웃 방화구획으로의 화재확산을 방지하기 위해서는 방화셔터로부터 일정 이격거리 이내에는 수용물품이 배치되지 않도록 제한하거나, 복사열 제한 성능을 확보한 방화셔터를 설치하도록 하는 등 물류시설 방화셔터 관련 기준을 개선할 필요성이 있다. The mock-up experiments were conducted to confirm the possibility of fire spreading, such as ignition of commodities (e.g., cardboard boxes), owing to the radiant heat, in the event of a fire in the fire shutter, which is the main fire compartment element that forms the fire compartment of logistics facilities. From the experiment, it was found that commodities located at a distance of 1, 2, and 3 m from the fire shutter can be ignited by the radiant heat of the fire shutter in the event of a fire, which can affect the spread of the fire. Therefore, to prevent the spread of the fire to neighboring fire compartments in the event of a fire in logistics facilities, it is necessary to restrict the placement of commodities within a certain separation distance from the fire shutter or install a fire shutter with radiant heat limiting performance. It is important to improve standards related to fire shutters in logistics facilities.
무선 수동형 센서 망에서 센서 노드에게 동일한 성공 기회를 제공하는 MAC 방식
서희원(Heewon Seo),하준(Jun Ha),박진경(Jin Kyung Park),최천원(Cheon Won Choi) 대한전자공학회 2018 대한전자공학회 학술대회 Vol.2018 No.6
In a wireless passive sensor network, RF sources wirelessly supply energy to sensor nodes. Against theoretical expectations of an abundance of energy, a wireless passive sensor network suffers from a scarcity of energy in practice. Such a scarcity forces a wireless passive sensor network to adopt a contending-type MAC scheme, which inevitably brings about packet collision and hence capture phenomenon. Note that the capture phenomenon causes a discrimination against a sensor node which is far off from the sink node. In this paper, we propose a MAC scheme, rooted in framed and slotted ALOHA, which provides each sensor node with an equal opportunity of successful packet delivery. In a case study, we prove that such a MAC scheme exists and construct the MAC scheme explicitly. Also, we develop an exact expression of nodal throughput in a closed form. Using the throughput formulae, we then demonstrate that the proposed scheme is able to attain a higher total throughput than the conventional scheme.
고밀도의 떠있는 센서 노드로 구성된 입체적 무선 센서 망을 위한 ALOHA 기반 MAC 방식의 Throughput 성능
서희원(Heewon Seo),하준(Jun Ha),박진경(Jin Kyung Park),최천원(Cheon Won Choi) 대한전자공학회 2016 대한전자공학회 학술대회 Vol.2016 No.6
In this paper, we consider a three-dimensional wireless sensor network in which a single sink node lies on the ground and a large number of airborne sensor nodes are densely deployed in the air. For supporting many sensor nodes to deliver packets to the sink node, we also consider an ALOHA-based MAC scheme. Using a simulation method, we then investigate the throughput achieved by the MAC scheme. Especially, we reveal the effect of the spatial distribution describing sensor nodes locations as well as the path loss experienced by transmitted packets on the throughput performance.
서희원(Hee Won Seo),한창수(Chang-Soo Han),이종홍(Jong-Hong Lee),송진원(Jin-Won Song),이응숙(Eung-Sug Lee) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
We fabricated a sensor device for nanomaterials by dielectrophoresis. We used applied voltage and frequency to align of individual nanomaterial. And then, it was deposited to Pt metal at contact point of electrode and nanomaterial by focused-ion beam for decreased contact resistance. Among nanodevices, we used SWNT device for NO₂ gas sensing. All of experiments are occurred in several seconds at a room temperature. The morphology of nanosensor was observed by scanning electron microscope. The performance of the sensor was obtained by current-voltage measurement.