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회귀적 완전 최소 자승법을 이용한 헤테로다인 레이저 간섭계의 비선형 오차보정
유영욱(Younguk Yoo),이상철(Sangchul Lee),유관호(Kwanho You) 대한전기학회 2009 정보 및 제어 심포지엄 논문집 Vol.2009 No.10
The heterodyne laser interferometer has been widely used in linear displacement and precise measurement field. However the periodic nonlinearity that arises from incomplete laser sources and nonideal optical components restricts the precise measurement at the nano-meter level. In this pa야,r the recursive total least squares (RTLS) algorithm which can obtain optimal compensation parameters of nonlinearity is introduced. Using the RTLS algorithm, the nonlinearity error is reduced and the measurement data can be more stabilized. The effectiveness of RTLS approach is verified through the comparison of the experimental results with those obtained by a capacitance displacement sensor.
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비열 유전체장벽방전 플라즈마의 포도상구균 및 대장균 살균효과
김기영 ( Keyyoung Kim ),백남원 ( Namwon Paik ),김용희 ( Yonghee Kim ),유관호 ( Kwanho Yoo ) 한국산업보건학회 (구 한국산업위생학회) 2018 한국산업보건학회지 Vol.28 No.1
Objectives: The objective of this study was to examine the effect of non-thermal dielectric barrier discharge (DBD) plasma on decontamination of Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli) as common pathogens. Methods: This experiment was carried out in a chamber (0.64m<sup>3</sup>) designed by the authors. The plasma was continuously generated by a non-thermal DBD plasma generator (Model TB-300, Shinyoung Air tech, Korea). Suspensions of S. aureus and E. coli of 0.5 McFarland standard (1.5 x10<sup>8</sup>CFU/mL) were prepared using a Densi-Check photometer (bio Merieux, France). The suspensions were diluted1:1000 in sterile PBS solutions (approximately10<sup>4-5</sup>CFU/mL) and inoculated on tryptic soy agar (TSA) in Petri dishes. The Petri dishes (80mm internal diameter) were exposed to the non -thermal DBD plasma in the chamber. Results: The results showed that 95% of S. aureus colonies were killed after a six-hour exposure to the DBD plasma. In the case of E. coli, it took two hours to kill 100% of the colonies. The gram-negative E. coli had a greater reduction than the gram-positive S. aureus. This difference may be due to the structure of their cell membranes. The thickness of gram-positive bacteria is greater than that of gram-negative bacteria. The S. aureus is more resistant to DBD plasma exposures than is E. coli. It should be noted that average concentrations of ozone, a byproduct of the DBD plasma generator, were monitored throughout the experiment and the results were well below the criteria, 50 ppb, recommended by the Korean Ministry of the Environment. Thus, non-thermal DBD plasma is deemed safe for use in hospital and public facilities. Conclusions: There was evidence that non-thermal DBD plasma can effectively kill S. aureus and E. coli. The results indicate that DBD plasma technology can greatly contribute to the control of infections in hospitals and other public and private facilities.
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