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비행환경 감지 기능을 보유한 ESAD 개발 및 기능 확인을 위한 슬레드 시험 방안
조한성,Hanseong Jo 한국군사과학기술학회 2023 한국군사과학기술학회지 Vol.26 No.3
Recently electronic safety and arming device(ESAD) has attracted increasing attention due to its design flexibility. However, ESAD can be armed unintentionally due to a malfunction of an external device or interface. Thus ESAD needs an internally generated arming signal independent from the external device. In this paper, a new sensor-hybrid ESAD(SHESAD) with a flight environment sensing function for generating arming signal internally is proposed and a sled test based method is also suggested for evaluating its functions. Through the test results, the operability of the flight environment sensing function was confirmed. Also, it is shown that the proposed test method is suitable for verification of ESAD with the flight environment sensing function.
Reduction Effect of Microorganisms by Nano Plasma ion (NPi)
HyeonCheol Kang(강현철),HanSeong Yun(윤한성),Bong Jo Sung(성봉조),Sung Hwa Lee(이성화),Jang Woo Lee(이장우),Yong Bae Seo(서용배),Myung-Suk Lee(이명숙) 한국생명과학회 2011 생명과학회지 Vol.21 No.12
Nano plasma ion (NPi) generator에서 발생한 NPi의 미생물에 대한 살균 효과를 측정하기 위해 미생물 종류, 조사 시간, 챔버 용적, 이온 수량, 거리에 따라 실험 하였다. 먼저 6종의 미생물 Escherichia coli, Pseudomonas aeruginosa, Salmonella typhimurium, Klebsiella pneumoniae, Staphylococcus aureus, Bacillus subtilis를 대상으로 실험한 결과 미생물 종류에 따라 각각 다른 감소율을 나타냈으며, 그람 음성균인 E. coli가 96.57%로 가장 높았고, 그람 양성균 중 포자를 생성하는 B. subtilis가 57.41%로 가장 낮았다. 그리고 NPi 조사시간에 따라 살균력 측정한 결과, 반응 초기에 대부분의 미생물이 사멸하였으며 이후 서서히 증가하였다. 또한 챔버의 크기에 따른 E. coli의 감소율을 비교하였으며 0.005 ㎥부터 30 ㎥까지 5개 챔버에서 NPi를 2시간 조사한 결과 용적이 증가함에 따라 포화이온 농도는 낮아졌고 이와 함께 살균력도 감소하였다. 이에 1 ㎥ 챔버에 NPi generator를 추가로 설치하여 포화이온농도에 따른 E. coli의 감소율을 알아보았고 포화 이온 농도가 증가함에 따라 감소율도 함께 증가하는 것으로 나타났다. 마지막으로 NPi generator의 거리에 따른 E. coli의 감소율을 확인하였고 이온이 직접적으로 분출되는 부분의 99.19%를 제외한 나머지 위치에서 팬에 의한 이온 순환으로 포화농도가 비슷하게 유지 되었으며 약 97%의 감소율을 나타냈다. The bactericidal effect of nano plasma ion (NPi) which was generated by NPi was analyzed using different kinds of microorganisms, exposure times, chamber sizes, ion amounts and distance. As the result of Escherichia coli, Pseudomonas aeruginosa, Salmonella typhimurium, Klebsiella pneumoniae, Staphylococcus aureus and Bacillus subtilis were shown different in decrement. Gram-negative bacteria E. coli showed the highest percentage (96.57%) and Gram-positive bacteria B. subtilis which produced spore has the lowest percentage (57.41%). From the exposure time of NPi most of the microorganisms were extinct at an early stage. According to the size of the chamber we compared the loss of E.coli and the experiment result shown, analyzed NPi using 5 chambers 0.005 ㎥ to 30 ㎥ for 2 hr, that when volume of the chamber increased, saturation ion and bactericidal effect was decreased. In addition, an NPi generator installed in the 1 ㎥ chamber investigated the decrement of E. coli. Saturation ion concentration increased with decrement. Finally, E. coli showed a similar reduction according to the distance from NPi generator.
진동 유체 기반 실린더 기판 딥코팅을 통한 균일 두께 필름의제조 방법
이정락(Jeongrak Lee),곽현수(Hyunsu Kwak),조한성(Hanseong Jo),송유성(Yuseong Song),이안나(Anna Lee) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
We study the fabrication of uniformly thick films on cylinders by dip-coating with oscillation. In conventional dip-coating, whose physics was first investigated by Landau, Levich, and Derjaguin, a fast process generates a coating thickness gradient while a slow process limits the film thickness and is time-consuming. A new coating method of thick films was recently proposed, which involves dipping a solid substrate in a bi-layer liquid bath with neutral buoyancy and applying oscillation. In this study, we first experimentally and theoretically find how the film thickness profile is determined in the uniaxial coating. Then, we find the condition to achieve uniform thickness distribution along the circumferential direction in the biaxial coating. Applications of our results are not limited to areas where coating is widely used, such as solar cells or flexible displays; it can be used in the medical industry for efficiently fabricating functional catheters and vascular replicas.
고충격 가속도센서용 고분자 기반 기계식 저역통과필터의 성능 예측
송세환,장준용,이유림,조한성,윤상희,Sehwan Song,Junyong Jang,Youlim Lee,Hanseong Jo,Sang-Hee Yoon 한국군사과학기술학회 2023 한국군사과학기술학회지 Vol.26 No.3
A polymer-based mechanical low-pass filter(m-LPF) for high-g accelerometers makes it possible to remove high-frequency transient noises from acceleration signals, thus ensuring repeatable and reliable measurement on high-g acceleration. We establish a prediction model for performance of m-LPF by combining a fundamental vibration model with the fractional derivative standard linear solid(FD SLS) model describing the storage modulus and loss modulus of polymers. Here, the FD SLS model is modified to consider the effect of m-LPF shape factor (i.e., thickness) on storage modulus and loss modulus. The prediction accuracy is verified by comparing the displacement transmissibility(or cut-off frequency) estimated using our model with that measured from 3 kinds of polymers(polysulfide rubber(PSR), silicone rubber(SR), and polydimethylsiloxane(PDMS)). Our findings will contribute a significant growth of m-LPF for high-g accelerometers.