• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.43 no.8
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• pp.684-691
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• 2015

A sudden increase in combustion pressure is observed in the ducted rocket combustion test equipped with pipe shaped and converging nozzle exhaust tubes. This study aims to understand the physical mechanism of abrupt change in combustion pressure using thermal choking in the exhaust tube. Results confirmed that the thermal choking of the flow inside the exhaust tube was responsible for the sudden increase in combustion pressure. Also, high pressure exponent of solid propellants is critical sensitive to the occurrence of thermal choking exhaust pipe. Additionally, numerical simulation showed that the sudden increase in combustion pressure was less possible in diverging pipe because thermal choking is more reluctant to occur.

• Environmental engineer
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• v.19 s.186
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• pp.84-85
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• 2002

• Environmental engineer
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• v.18 s.188
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• pp.88-90
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• 2002

• Environmental engineer
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• v.18 s.185
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• pp.92-94
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• 2002

• Environmental engineer
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• s.181
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• pp.86-93
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• 2001

• Journal of the Korean Institute of Gas
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• v.24 no.2
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• pp.36-43
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• 2020

Gas system fire extinguishing equipment is a very economically useful facility, but if it is not used for a long period of time after installing the equipment, there is possibility of rupture due to corrosion of containers and operation errors of equipment systems, and this is very dangerous. However, it is impossible to experiment to check whether the equipment is operating normally. If gas is temporarily released into the enclosed space due to rupture and malfunction, it can cause serious human damage due to gas suffocation. In this study, based on the suffocation death accident of gas system fire extinguishing facility, the inflow path of released gas and the possibility of death and time to death were estimated using a 3D scan and FLACS.

• The Journal of the Korea institute of electronic communication sciences
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• v.13 no.6
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• pp.1411-1416
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• 2018

Currently, most of the industrial areas like chemistry, manufacturing, shipbuilding, and steel, perform the work related to gas, and the staffs who are in charge of this work have a risk of suffocation without cognizing incidents like gas leak. For example, when the nitrogen gas leaked in 2015 at Paju, two people were killed and four people were injured. In 2018 at Pohang, four workers were suffocated to death from nitrogen gas. In order to solve this problem, this study realized the system in which workers could immediately cognize the gas leak and also deliver the situation to the staff in charge of safety at the same time, by installing the IoT device composed of gas sensor and communication module on the safety helmet that should be worn by field workers. This study is expected to be able to reduce the casualties caused by gas leak in industrial sites.

• Environmental engineer
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• v.18 s.190
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• pp.73-75
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• 2002

우리 환경인들의 삶의 터전인 현장에는 많은 유해$\cdot$위험요인들이 상존하고 있으나 이를 간과하거나 무시하고 지나쳐버림으로써 돌이킬 수 없는 중대재해가 빈번히 발생하고 있습니다. 이에 본지는 최근 발생된 환경오염방지시설 또는 생산공정 현장에서의 재해사례를 알려드림으로써 발생가능한 재해를 사전예방하고 회원 여러분들의 소중한 생명을 보호코자 합니다.

• Environmental engineer
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• v.19 s.208
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• pp.80-81
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• 2003

우리 환경인들의 삶의 터전인 현장에는 많은 유해$\cdot$위험요인들이 상존하고 있으나 이를 간과하거나 무시하고 지나쳐버림으로써 돌이킬 수 없는 중대재해가 빈번히 발생하고 있습니다. 이에 본지는 최근 발생된 환경오염방지시설관련 재해사례를 알려드림으로써, 발생가능한 재해를 사전예방하고 회원 여러분들의 소중한 생명을 보호코자 합니다.

• Environmental engineer
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• v.19 s.199
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• pp.52-53
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• 2003

우리 환경인들의 삶의 터전인 현장에는 많은 유해$\cdot$위험요인들이 상존하고 있으나 이를 간과하거나 무시하고 지나쳐버림으로써 돌이킬 수 없는 중대재해가 빈번히 발생하고 있습니다. 이에 본지는 산업현장에서 발생된 재해사례를 알려드림으로써, 발생가능한 재해를 사전예방하고 회원 여러분들의 소중한 생명을 보호코자 합니다.