• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2011년도 제37회 추계학술대회논문집
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• pp.340-343
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• 2011

지금까지 많은 파이로 분리장치들이 우주 발사체 및 유도무기에 사용되고 있다. 이중 가장 많이 사용되고 있는 분리장치가 폭발볼트이다. 폭발볼트는 볼트내에 화약이 내장되고 작동시 내장된 화약이 폭발하면서 볼트 몸체가 절단되기 때문에 작동시 파이로충격과 미세한 파편이 발생할 수 있다. 이와 같은 단점으르 보완하기 위해 화약 연소시 발생되는 압력을 이용하여 구조물을 작동시켜 분리가 될 수 있는 Pyro-lock을 설계하게 되었다. 본 논문에서는 Pyro-lock의 작동개념, 부품 설계, 압력카트리지 위력 결정, 분리성능 및 내환경성 평가를 통하여 Pyro-lock의 작동 및 결합 신뢰도를 확인하였으며 이와 유사한 작동메커니즘을 갖는 분리장치를 설계하고 평가할 수 있는 개발절차를 제시하였다.

• 한국전자통신학회논문지
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• 제15권2호
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• pp.253-258
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• 2020

우리나라의 석유화학산업단지는 폭발성 가스와 가연성 가스로 인하여 언제나 폭발 위험성이 높다. 이러한 폭발을 방지하기 위한 방법으로 석유화학산업단지의 대부분 설비에 방폭 성능을 요구하고 있다. 방폭용으로 현재 사용하고 있는 제어기 패널은 패널의 내부와 외부의 압력(양압)과 온도를 일정하게 유지를 위해 외부에서 수동으로 공기를 주입하는 방식을 사용하고 있다. 이에 본 논문은 자동으로 온도를 제어할 수 있도록 패널 내부의 온도에 따라 가열과 냉각을 자동으로 수행하는 자동 온도조절기를 제안한다.

• 한국건설순환자원학회논문집
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• 제2권2호
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• pp.100-106
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• 2014

고강도 콘크리트는 구조적으로 우수하며 사용성 및 내구성이 뛰어나 건축물에서 그 활용성이 꾸준히 증가하고 있다. 그러나 화재처럼 고온에서 고강도 콘크리트는 폭렬이 발생될 가능성이 있으며, 폭렬 원인은 콘크리트 내부의 수증기압이 가장 큰 원인으로 알려져 있다. 콘크리트의 폭렬을 제어할 수 있는 일반적인 방법은 콘크리트 표면에 내화피복을 사용하여 화재 시 부재의 온도상승을 억제하는 방법이 있다. 이에 따라 본 연구에서는 각종 골재와 유기섬유를 사용하여 콘크리트 내화피복용 모르타르를 제조하고 그 고온 성상을 파악하고자 한다. 실험결과 퍼라이트와 폴리프로필렌 섬유를 사용한 모르타르는 내부공극과 밀도를 변화시켜 내부온도 상승을 지연시킨다. 그 결과 고강도 콘크리트의 폭렬을 방지할 수 있는 내화 피복재로 활용 가능하다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2015년도 추계 학술논문 발표대회
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• pp.22-23
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• 2015

For the facility using explosive gas, it is very important to use anti-explosive structure. Therefore, using FRC of high stiffness should be used, but the research on actual application under the construction conditions is not sufficient. Hence, in this research, based on the case study on application of FRC for anti-explosive structure, the strength characteristics of FRC with combined fibers were evaluated comparing between before and after the pumping.

• 한국소음진동공학회논문집
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• 제21권3호
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• pp.280-284
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• 2011

The mass change during the molecular interaction between explosive specific bio-receptors and target molecules has been measured using quartz crystal microbalance(QCM), which has a mass change detection limit up to ~ng/$cm^2$. The environmental effect on the molecular interaction has been evaluated. In the liquid phase molecular interaction experiments, the high selectivity of the bio-receptor to DNT compared with toluene has been shown and the sensitivity for various concentrations of DNT has been demonstrated.

• 한국대기환경학회지
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• 제33권5호
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• pp.521-528
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• 2017

In the combustion treatment of explosive gases with a high heating value such as $H_2$ and $NH_3$ used in semiconductor and chemical processes, the heat recovery modeling and exergy analysis of the process using the Aspen Plus simulator and its thermodynamic data were performed to examine the recovery of high temperature thermal energy. The heat recovery process was analyzed through this process modeling while the exergy results clearly confirmed that the rigorous reaction mainly occurs in the condenser and the chamber. In addition, the process modeling demonstrated that approximately 95% of the exergy is destructed on the basis of the exergies injected and the exergy being exhausted. Using the exergy technique, which can quantitatively analyze the energy, we could understand the energy flow in the process and confirm that our heat recovery process was efficiently designed.

• 한국군사과학기술학회지
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• 제23권1호
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• pp.43-51
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• 2020

In this study, numerical analysis was carried out on a complex pressure field of blast waves caused by the detonation of high explosives in various environments. The generated blast waves propagated in the air, upon the sudden release of high energy induced by the explosion. Reflected waves were created when the pressure waves encountered certain obstacles such as the ground or the walls of structures. The propagation of the blast waves and its interaction with the reflected waves were simulated. An adaptive mesh refinement was applied to improve the efficiency of distribution of computer resource, for the computational calculation of the blast wave propagation in a wide open space. In addition, the integration of the calculation domains for the explosive and air were considered when the maximum density of the explosive region was below critical value. The results were verified by comparison with the pressure time history from blast wave experiments performed under two topographical conditions.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2000년도 추계학술대회논문집A
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• pp.736-742
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• 2000

Mass removed from crystalline silicon samples during high power single-pulse laser ablation was studied by measuring the resulting crater morphology with a white light interferometric microscope. The volume and depth of the craters show a strong nonlinear change as the laser irradiance increases across a threshold value, that is, approximately $2.2{\times}10^{10}\;W/cm^2$. Time-resolved shadowgraph images of the ablation plume show the ejection of large particulates from the sample for laser irradiance above the threshold, with a time delay of about 300-400 nsec. The thickness of superheated liquid layer near the critical temperature was numerically estimated, considering the transformation of liquid metal into liquid dielectric near the critical state (i.e., induced transparency). The estimated thickness of the superheated layer at a delay time of 200 nsec agreed with the measured crater depths, suggesting that induced transparency promotes the formation of a deep superheated liquid layer which leads to an explosive boiling responsible for the sudden increase of crater volume and depth.

• 한국군사과학기술학회지
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• 제16권6호
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• pp.857-866
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• 2013

This paper is concerned with the material properties of functional high explosive(FHX) simulant at various strain rates ranging from $10^{-4}/sec$ to $10^1/sec$. Material properties of FHX at high strain rates are important in prediction of deformation modes of FHX in a warhead which undergoes dynamic loading. Inert FHX stimulant which has analogous mechanical properties with FHX was utilized for material tests due to safety issues. Uniaxial tensile tests at quasi-static strain rates ranging from $10^{-4}/sec$ to $10^{-2}/sec$ and intermediate strain rates ranging from $10^{-1}/sec$ to $10^1/sec$ were conducted with JANNAF specimen using a tensile testing machine, INTRON 5583, and developed high speed material testing machine, respectively. Uniaxial compressive tests at quasi-static strain rates and intermediate strain rates were conducted with cylindrical specimen using a dynamic materials testing machine, INSTRON 8801. And cyclic compressive loading tests were performed with various strain rates and strains. Deformation behaviors were investigated using captured images obtained from a high-speed camera.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2003년도 The Fifth Asian Computational Fluid Dynamics Conference
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• pp.210-210
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• 2003