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박찬오,노호준,이재민 대한마취통증의학회 2019 Anesthesia and pain medicine Vol.14 No.4
Background: Tracheal intubation is closely associated with increases in intraocular pressure (IOP); however, the effects of double-lumen tube (DLT) intubation on IOP have not been validated. Systemic hypertension (HTN) is another factor that may increase IOP. In this study, we observed differences in IOP increases between DLT and singlelumen tube (SLT) intubation, and evaluated the influence of underlying HTN during rapid sequence induction. Methods: Sixty-eight patients were allocated into one of the following group: SLT/without HTN (n = 17), SLT/HTN (n = 17), DLT/without HTN (n = 17), and DLT/HTN (n = 17). An SLT was inserted for orthopedic or gynecological surgery, and a DLT was inserted for lung surgery after rapid sequence induction using succinylcholine. IOP was measured before anesthetic induction and until 10 min after intubation using a handheld tonometer (Tono-Pen AVIA®). Results: In the DLT/without HTN and DLT/HTN groups, the maximum increases in IOPs after tracheal intubation were 7.9 and 12.2 mmHg, respectively, compared to baseline. In the SLT/without HTN and SLT/HTN groups, the maximum increases were 5.0 and 4.9 mmHg, respectively, compared to baseline. In comparisons between patients with and without underlying HTN, the values of IOPs were comparable. Conclusions: Tracheal intubation with a DLT is associated with more increases in IOPs than with an SLT in rapid sequence induction. Well-controlled underlying hypertension did not increase IOP during tracheal intubation.
폐금속광산 지역의 비소오염토양 처리를 위한 선별 기술 적용
박찬오,김종원,박준형,이영재,양인재,이재영,ParK, Chan-Oh,Kim, Jong-Won,Park, Jun-Hyoung,Lee, Young-Jae,Yang, In-Jae,Lee, Jai-Young 한국지하수토양환경학회 2013 지하수토양환경 Vol.18 No.5
After the law has been enacted for the prevention and recovery of mining damage in 2005, efforts of remediation have been started to recover heavy metal contaminated soils in agricultural land near mining sites. As part of an effort, the upper part of cultivation layer has been treated through covering up with clean soil, but the heavy metal contamination could be still spreaded to the surrounding areas because heavy metals may be remained in the lower part of cultivation layers. In this study, the most frequently occurring arsenic (As) contamination was selected to study in agricultural land nearby an abandoned metal mining site. We applied separation technologies considering the differences in the physical characteristics of soil particles (particle size, density, magnetic properties, hydrophobicity, etc.). Based on physical and chemical properties of arsenic (As) containing particles in agricultural lands nearby mining sites, we applied sieve separation, specific gravity separation, magnetic separation, and flotation separation to remove arsenic (As)-containing particles in the contaminated soil. Results of this study show that the removal efficiency of arsenic (As) were higher in the order of the magnetic separation, flotation separation, specific gravity separation and sieve separation.
폐금속 광산지역 농경지 납, 아연 오염 토양의 중금속 고도선별
박찬오,김진수,서승원,이영재,이재영,박미정,공성호,Park, Chan Oh,Kim, Jin Soo,Seo, Seung Won,Lee, Young Jae,Lee, Jai Young,Park, Mi Jeong,Kong, Sung Ho 한국지하수토양환경학회 2013 지하수토양환경 Vol.18 No.7
The study is to propose the optimal separation technique of heavy metals (Pb and Zn) contaminated in soil for improving the removal efficiency by various applicable techniques. The heavy metal contaminated soil samples near abandoned mine X-1 and X-2 were used for the study. Firstly, the wet classification process was shown more than 80% of removal efficiency for lead and zinc. Meanwhile, the magnetic separation process was shown low removal efficiency for lead and zincs because those heavy metals were non-magnetic materials. For the next step, the flotation separation process was shown approximately 24.4% of removal efficiency for zinc, while the gravity concentration process was shown approximately 57% of removal efficiency for lead, and 19.9% of removal efficiency for zinc, respectively. Therefore, zinc contaminated in soil would be effectively treated by the combination technique of the wet classification and the flotation technique. Meanwhile, lead contaminated in soil would be effectively treated by the combination technique of the wet classification process and the flotation process. Furthermore, the extraction of organic matter was shown more effective with aeration, 3% of hydrogen peroxide and 3% of lime such as calcium hydroxide.
대남광산 농경지 토양 내 중금속 특성에 따른 물리적 선별 처리효율에 관한 연구
박찬오,홍동호,이재영,이영재,이진수,ParK, Chan Oh,Hong, Dong-Ho,Lee, Jai-Young,Lee, Young Jae,Lee, Jin-Soo 한국지하수토양환경학회 2013 지하수토양환경 Vol.18 No.5
The main objective was to evaluate the efficiencies of different separation techniques, such as gravity separation, magnetic separation, and aerial separation. Zinc and cadmium removal efficiencies by gravity separation and magnetic separation were 28.3~29.3% and 19.1%, respectively, and were higher than the efficiency obtained by aerial separation. Results showed that the combination of gravity separation and magnetic separation in series which was to maximize the removal efficiencies gave removal efficiency of 21.5~38.7% for zinc and 22.1~23.4% for cadmium. The mass of soil meeting the regulation standards for zinc and cadmium after retrieval from the combined separation process accounted for approximately 80% of the treated soil that would be reusable without the pre-treatment procedure as the neutralization process using in the soil washing method. Physical separation techniques utilizing heavy metal properties are the alternative method to remediate heavy-metal contaminated soils in environmental and economic aspects.
박찬오(Chan-O Park),신우식(Woo-Sik Shin),지용환(Yong-Hwan Ji),조정현(Jung Hyun Cho),윤길원(Gilwon Yoon) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
PPG signal can have significant DC drift due to motion artifact and small AC amplitudes caused by low perfusion. We controlled DC drift by adjusting the signal ground level and AC amplitude by varying LED light intensity. Using a microprocessor-based system, PPG levels could be successfully controlled in a 3V single power supply system.