단백포소화약제의 유동성 변화에 따른 소화 특성

신창섭 ( Changsub Shin ),정현정 ( Hyun Jeong Jeong ) 한국안전학회(구 한국산업안전학회) 2014 한국안전학회지 Vol.29 No.2

Foam extinguishing agent is widely used for extinguishing combustible liquid fires. Compared to other foam type extinguishing agents, protein foam has relatively low cost and low toxicity and produces stable foam blanket which is excellent in heat resistance and sealability, despite it has weak fluidity. Therefore the study investigated foaming characteristics followed by various factors affecting the fluidity of the protein foam extinguishing agent. The extinguishing characteristics differentiated by the changes in fluidity were also experimented. Foaming performance was compared by measuring the expansion ratio and the 25% drainage time. Moreover, the 25% drainage time and the extinguishing time was compared. The results showed that the 25% drainage time and the expansion ratio were increased as the pressure of nozzle and the concentration of hydrolyzed protein liquid enlarged. However the foaming and extinguishing performance were not improved when the condition exceeded certain level of pressure and concentration. The fastest fire extinguishing condition was the nozzle pressure 4bar with the 85wt.% of concentration of hydrolyzed protein liquid.

미세물분무를 이용한 PPV의 화재 진압효과

김성원,신창섭 한국안전학회 2003 한국안전학회지 Vol.18 No.4

To inject fresh air into a fire room, Positive Pressure Ventilation (PPV) can be used and the blower of PPV increases inside pressure of the room. It makes high flow rate of products of combustion, smoke and heat from the structure, and it is very helpful to fireman on the fire extinguishing work. The flame moves to the direction of airflow and the temperature of flame can be decreased rapidly. In this experiment, a water mist system is applied to PPV to increase the effectiveness, and various effective factors are studied. n-Heptane and pine wood stick were used as fuel. Temperatures at the above and behind the combustion pan were strongly reduced by the water mist system and by the convective cooling with airflow. The smoke density was also decreased by PPV with water mist system and it can be explained by the absorption of smoke particles on the water mist droplet and by the strong exhausting effects of mobile fan.

Needle injection simulations using high-fidelity finite element model of human scalp tissue

Tsabita Fidinillah,Changsub Shin(신창섭),Taehyeong Kim(김태형),Daisoon Kwak(곽대순),Taeksang Lee(이택상) 대한기계학회 2025 대한기계학회 춘추학술대회 Vol.2025 No.5

Development of a Detailed Image-Based Finite Element Model of Skin for Needle Insertion Simulations

Tsabita Fidinillah,Changsub Shin(신창섭),Taehyeong Kim(김태형),Daisoon Kwak(곽대순),Taeksang Lee(이택상) 대한기계학회 2025 대한기계학회 춘추학술대회 Vol.2025 No.4

첨가제로 아세트산 나트륨-3수화물을 함유한 물 액적의 증발 특성

박재만,신창섭 한국안전학회 2004 한국안전학회지 Vol.19 No.2

The evaporation phenomena of water droplet which has sodium acetate trihydrate(CH3OOONa 3H2O) as a fire suppression additive were studied. Solutions of sodium salt up to 50% and heated stainless-steel surface were used in the experiment. The evaporation process was recorded using a charge-coupled-device camera at 120 frames per second. The average evaporation rate of the sodium acetate trihydrate solution was lower than that of pure water at a given surface temperature and decreased with the concentration increase due to the precipitation of salt in the liquid film and change of surface tension. The variation of liquid film diameter was measured by time and it was increased by the hot surface temperature increase.

폴리실리콘 제조 공정에서 화학물질 누출 시 피해범위에 관한 연구

우종운(Jongwoon Woo),신창섭(Changsub Shin) 한국가스학회 2018 한국가스학회지 Vol.22 No.4

There is growing interest in solar power generation due to global warming. As a result, demand for polysilicon, which is the core material for solar cells, is increasing day by day. As the market grows, large and small accidents occurred in the production process. In 2013, hydrochloric acid leaked from the polysilicon manufacturing plant in SangJu. In 2014, a fire occurred at a polysilicon manufacturing plant in Yeosu, and in 2015, STC(Silicon Tetrachloride) leaked at a polysilicon manufacturing plant in Gunsan City. Leakage of chemicals in the polysilicon manufacturing process can affect not only the workplace but also the surrounding area. Therefore, in this study, we identified the hazardous materials used in the polysilicon manufacturing process and quantitatively estimate the amount of leakage and extent of damage when the worst case scenario is applied. As a result, the damage distance by explosion was estimated to be 726 m, and the damage distance to toxicity was estimated to be 4,500 m. And, if TCS(Trichlorosilane), STC(Silicon Tetrachloride), DCS(Dichlorosilane) leaks into the air and reacts with water to generate HCl, the damage distance is predicted to 5.7 ㎞.

불화수소 누출사고 비교를 통한 하역작업장의 안전성 향상방안에 관한 연구

우종운(Jongwoon Woo),신창섭(Changsub Shin) 한국가스학회 2018 한국가스학회지 Vol.22 No.4

The purpose of this study is to assess quantitatively the amount of leaks and the extent of dispersion in case of a leak at a hydrogen fluoride tank container unloading station, and to suggest a safety improvement plan to prevent recurrence of similar accidents. In 2012, Company H leaks 8 tonnes of tank containers with a maximum storage capacity of 18 Ton, causing it to become a social issue. As a result of calculation using Gaussian plume model, the concentration was estimated to be more than 20ppm from the leak point to 1,321 m radius. The leakage of hydrogen fluoride from the company R in 2014 was estimated to be 11.02 ㎏, of which 2.9 ㎏ was treated by the scrubber. As a result of calculation using Gaussian plum model, the damage range with a concentration of 20ppm or more from the leak source was estimated to be 69 m in radius. As a result of comparing the above two accidents, it was found that the leakage amount was about 987 times different and the damaged site was more than 19 times different. Therefore, it was concluded that it was necessary to control the wearing of the protective equipment, the enclosure of the unloading site, the installation of the scrubber, and the emergency training to avoid the accidental leakage of a hydrogen fluoride from the unloading site.

선박화재 적용 단백포 소화약제의 안정제에 따른 소화특성

이응우 ( Eungwoo Lee ),신창섭 ( Changsub Shin ) 한국안전학회(구 한국산업안전학회) 2015 한국안전학회지 Vol.30 No.4

Onboard fire extinguishing system is important to protect cargo and human lives and every oil tanker has foam type fire extinguishing system. Because of environmental problem, agent which contains materials such as Perfluorinated compounds are regulated and the development of the environmental friendly agent is required. The protein foam has less environmental pollution problem and has an excellent fire extinguish performance to oil fire. In the research, bivalency metal salts were added as stabilizer to increase fire resistance and stability of the foam. Ferrous sulfate, Iron chloride and Nickel chloride were used and to adjust to vessel, sea water was applied. As a stabilizer increased, the expansion ratio was raised. However 25% drainage time was decreased over 2.0 wt.% which is knowable that the foam brokes easily. The amount of generated foam was measured to check fluidity of foam and it appeared that when FeSO₄ 1.2 wt.% was added, the amount of generated foam reached large and also the 25% drainage time was high. To evaluate the fire extinguishing performance for oil fire, the small scale oil fire test was executed. When FeSO₄ 1.2 wt.% was added, fire extinguishing time was in its shortest which informs fluidity of foam and stability are important factors on fire extinguishing efficiency.

Novel Complex Self-Assembled Morphologies of an Asymmetric A₃B₃C₃ Star Polymer in Nanoscale Thin Films: Synchrotron Grazing Incidence X-ray Scattering Analysis

Moonhor Ree,Yecheol Rho,Changsub Kim,Tomoya Higashihara,Sangwoo Jin,Jungwoon Jung,Tae Joo Shin,Akira Hirao 한국고분자학회 2013 한국고분자학회 학술대회 연구논문 초록집 Vol.2013 No.10

미세물분무의 소화성능 개선을 위한 증점제(잔탄검)의 영향

김승일,신창섭,Kim. Seungil,Shin. Changsub 한국방재학회 2013 한국방재학회논문집 Vol.13 No.5

물은 다양한 소화효과를 지니고 있는 경제성 있는 소화약제임에도 점성이 상대적으로 낮아 방사시 화재표면에 점착하지 못함으로 인한 소화효과의 감소 및 손실되는 물, 물로 인한 2차 피해의 단점도 있다. 본 연구에서는 이러한 단점을 보완하고자 증점제인 잔탄검을 첨가하였으며 이를 미세물분무 노즐을 사용하여 목재화재 및 헵탄화재에 적용시켜 소화성능을 개선해 보고자 하였다. 실험결과 목재화재에 적용시킨 경우에는 0.2 MPa의 방사압에서 잔탄검 수용액 농도 0.2%가 순수 물에 비해 화염억제시간 및 소화시간이 각각 7.9배, 2.9배 빨랐으며 헵탄화재에 있어서는 잔탄검 수용액 농도 0.025%가 순수 물에 비해 약 5.2배 빠른 소화시간을 나타내었지만 이후의 증점된 농도에서는 소화에 실패하였다. 또한 소화에 필요한 물소모량도 소화시간에 비례하여 감소하였으며 방사압 증가에 따른 목재 및 헵탄화재의 소화성능도 향상되는 것을 알 수 있었다. Water is an economical extinguishing agent and has a variety of extinguishing effect. Since water does not adhere to the fire surface due to low viscosity, which causes to reduce extinguishing effect, secondary damage to unburned materials and loss of water. In this study, xanthan gum as a viscosity agent added to water and using water mist nozzle xanthan gum solution applied to wood crib fire and heptane fire to improve extinguishing performance. The results show that in case of wood crib fire in 0.2 MPa, flame suppression time and fire extinguishing time of xanthan gum 0.2% solution are 7.9 times, 2.9 times shorter than pure water, respectively. In heptane fire, fire extinguishing time of xanthan gum 0.025% solution is 5.2 times shorter than pure water in 0.2MPa, but extinguishing is failed after concentration of xanthan gum increase. Also, it is identified that water consumption decrease with extinguishing time and extinguishing performance of xanthan gum on wood crib fire and heptane fire improved according to increase of discharge pressure.