• 한국화재소방학회:학술대회논문집
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• 한국화재소방학회 2008년도 추계학술논문발표회 논문집
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• pp.235-238
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• 2008

High-rise buildings with stack effect caused by the foreclosure, which significantly delayed the spread of a fire in effects of these stack effect driving force said. In this research on the stack effect of the lobby if the pressurization of the stairwell analysis of the pressure distribution of the CONTAMW. Overall, the pressurization of the lobby makes it stairwell amount of pressure(+) to the zone in pressure designed to prevent the spread of smoke control performance and found that, the way a normal state and sub-pressurization in the stairwell with stack effect of the turbulence Such as the formation of the upper flow, but, in the upper atmosphere with pressurization was formed by the underlying trend.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 D
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• pp.2445-2447
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• 2002

In this paper, CAN-based feedback control system is proposed for the pressurization system of korean high-speed train. The control performance of the system is evaluated. According to the requirement of the pressurization system A process model considering network delay and an adaptive PID control method based on the process model are proposed here. And it is shown that the proposed adaptive PID control method considering the network delay has on adequate feature compared to some other existing methods consequently it can be considered to be applied the pressurization system of korean high-speed train.

• 한국화재소방학회논문지
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• 제25권4호
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• pp.89-93
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• 2011

(초)고층건축물에서 승강로가 연기 확산의 주요 통로였기 때문에 승강기를 통해 피난하는 것은 권장되지 않았다. 하지만 북미에서는 승강로를 연기로부터 방호하기 위해, 승강로를 가압하는 방식을 사용하여 왔다. 이번 시험은 실제로 승강로 급기가압 방식을 이용해서 연기 전파를 차단할 수 있는지와 피난수단으로 승강기를 사용할 수 있는지를 검증하기 위해 고층 아파트에서 실시되었다. 시험 결과 승강로가압은 공기의 이동에 의한 마찰손실이 작았기 때문에 150 CMM의 풍량에서 승강장과 세대 사이에 50 Pa의 차압을 전층에 고르게 형성시켰다. 또한 1개층 세대 문과 승강기 문이 동시에 개방되었을 때, 180 CMM의 풍량으로 연기의 역류를 차단할 수 있는 방연풍속을 형성하였다. 그리고 승강로가압은 모든 문이 닫힌 상태에서 차압유지에 필요한 풍량과 1개층이 개방되었을 때 방연풍속을 유지하는데 필요한 풍량의 차가 작아서 과압의 우려가 낮을 것으로 예상되었다. 따라서 이번 시험을 통해 고층아파트의 화재 시에 승강로가압을 적용하면 일반인과 피난약자의 피난수단으로 승강기를 사용할 수 있음을 확인하였다.

• 한국추진공학회지
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• 제27권1호
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• pp.49-57
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• 2023

자가증기 가압시스템은 저비용, 고신뢰도의 장점으로 차세대 재사용 발사체들의 추진기관에 널리 채택되고 있다. 자가증기 가압시스템은 구조가 간단하나 탱크 내부에서 일어나는 열과 물질의 전달과정에 대한 이해가 필요하다. 이러한 이유로 자가증기 가압시스템의 모사시험을 구상하였다. 모사시험설비는 해외 가압시험설비 사례와 전문가의 자문을 기반으로 구성하였는데, 실제 자가증기 가압시스템과 달리 추진제 탱크를 단열하여 외부환경에 의한 영향을 배제하고자 하였으며, 열과 물질 전달현상의 연구의 편의를 위하여 가압가스 공급라인과 추진제 배관을 분리하였다. 제작된 자가증기가압 모사시험설비를 이용하여 극저온 추진제에서 가압가스의 응축현상, 헬륨을 이용한 가압과 증발된 추진제를 이용한 자가증기가압의 효율성 비교, 그리고 자가증기의 온도에 따른 가압능력을 평가할 수 있다.

• 국제초고층학회논문집
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• 제2권4호
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• pp.341-344
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• 2013

During a building fire, smoke can flow through elevator shafts threatening life on floors remote from the fire. Many buildings have pressurized elevators intended to prevent such smoke flow. The computer program, CONTAM, can be used to analyze the performance of pressurization smoke control systems. The design of pressurized elevators can be challenging for the following reasons: (1) often the building envelope is not capable of effectively handling the large airflow resulting from elevator pressurization, (2) open elevator doors on the ground floor tend to increase the flow from the elevator shaft at the ground floor, and (3) open exterior doors on the ground floor can cause excessive pressure differences across the elevator shaft at the ground floor. To meet these challenges, the following systems have been developed: (1) exterior vent (EV) system, (2) floor exhaust (FE) system, and ground floor lobby (GFL) system.

• 한국축산식품학회지
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• 제32권3호
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• pp.301-307
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• 2012

We investigated the effects of non-meat protein binders combined with glucono-${\delta}$-lactone (GdL) on the binding properties regarding restructured pork prepared by high-pressure treatment. Soy protein isolate (SPI), casein (CS), whey protein concentrate (WPC), and egg white (EW) were used as non-meat protein binders and compared with the control (no binder) and with the ${\kappa}$-carrageenan (KC) treatment. The compression and depression rates were 2.3 and 37 MPa/s, respectively, and pressurization was conducted at 200 MPa for 30 min at $4^{\circ}C$. After pressurization, the physical properties (pH, water-holding capacity, color, tensile strength, and microscopic structure) of the sample were evaluated. The combination of pressurization with acidification enabled cold-set meat binding, and the binding strength of restructured pork was enhanced by the addition of non-meat proteins. Among binders, SPI demonstrated the best efficiency in binding meat pieces. Therefore, the present study demonstrated that the combination of acidification and pressurization processes with the utilization of non-meat protein binders has a potential benefit in meat restructuring.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2008년도 춘계학술대회논문집
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• pp.401-404
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• 2008

Pressurization system in a liquid-propellant launcher supplies the controlled gas into the ullage volume of propellant tanks to feed propellants to combustion chamber by pressurizing propellants stored in propellant tanks. The ullage part of propellant tank should be constantly pressurized to supply the propellants stored in propellant tanks to turbo-pump or combustion chamber by pressurant pressurization system. Pressurant used to pressurize propellants is generally stored in a series of tanks at cryogenic temperature and high preassure inside an oxidizer tank. The reason is to store the quantity of pressurant as much as possible and to make pressurant tanks as small as (i.e. as light as) possible. However for test convenience pressurant tank is located at STP (standard temperature and pressure) environment in this study. Orifices are widely adapted to several pressurization systems in liquid rocket propulsion systems. Discharge coefficients of orifices are essentially needed for the optimized design of pressurization system in liquid rocket propulsion system. For this study gaseous nitrogen was served as pressurant and rounded entry orifices were employed. The forty-two (42) rounded entry orifices (the radii of curvatures are 0.5 and 1.0) have been tested experimentally in the supersonic flow region. The discharge coefficients of rounded entry orifices with inside diameters ranging from about 1.4 to 5.0mm was measured with 0.95 ${\sim}$ 0.99.

• 한국화재소방학회논문지
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• 제4권1호
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• pp.3-12
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• 1990

This study is to Present the air Pressurization system of staircase as a way to decrease the injury of human life which is suffocated by smoke when the fire break out in building. 1) The best among an air pressurization system of stairshaft Is multiple air Injection system established to be situated an air injection point in each layer. 2) If the air pressurization system is also applied to the elevator accessory room to use commonly, it can prevent from the smoke spreading and pollution inside building caused by stack effect of elevator shaft. 3) For the reasonable and safe escape and air pressurization system must be carried out from the project of basic shape of building under the close cooperation with architect and fire protection expert.

• 한국축산식품학회지
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• 제28권4호
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• pp.415-421
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• 2008

This study evaluated the effects of thermal processing combined with high pressure on the properties of cooked pork. Pressurization followed by heating (PFH), heating followed by pressurization (HFP) and heating under pressurization (HUP) treatments were compared to a heated only control. Cooked meat without simultaneous pressurization showed little or no decrease in water binding properties relative to the control, regardless of the sequence of pressurization and heating. However, HUP treated pork had significantly higher water binding properties than the control (p<0.05). The pH values of all treatments were not significantly different with the exception of HUP at 300 MPa. The HUP treated pork showed the best tenderizing effects among all the treatments tested and the effect was more significant at increased pressure levels (p<0.05). In addition, increasing pressure levels significantly increased the L-values of pork (p<0.05). PFH and HFP treated pork had significantly lower a-values (p<0.05), while no significant differences were observed in HUP. HUP treated pork had the lowest b-values at 100 MPa. however, the differences were not significant at increasing pressure levels. These results indicate that heating under pressure is the best cooking condition for improving the quality characteristics of pork without adversely affecting its appearance.

• 한국추진공학회지
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• 제16권6호
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• pp.79-84
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• 2012

창이 있고 밀폐되어있는 시험챔버를 사용하여 고속가압에 의한 고체추진제의 균열진전시험을 수행하였다. 고체추진제 예균열 시험편은 시험챔버내에 설치되고, 축압기 내에 고압으로 축적된 질소가스는 고속가압을 위해 가압밸브를 통해 시험챔버를 가압한다. 시험챔버 내의 압력이 설정압력에 도달하게 되면 가압밸브는 닫히고 배기밸브를 통해 시험챔버는 감압이 된다. 본 논문에서는 시험결과로부터 시간에 따른 시험챔버압력을 나타내는 압력-시간 선도를 얻었으며, 선도로부터 가압비(${\Delta}P/{\Delta}t$)를 계산하였다. 3가지 가압비 64.34, 73.86, 85.44 MPa/s 에 대한 시험을 수행하였으며, 가압비에 따른 균열진전 길이를 측정하였다. 또한 고속 디지털카메라촬영을 통해 균열진전과정을 분석하였다.