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Palonosetron might not attenuate spinal anesthesia-induced hypotension during orthopedic surgery
최정주,장영진,정월선,조윤이 대한마취통증의학회 2016 Anesthesia and pain medicine Vol.11 No.2
Background: 5-Hydroxytryptamine3 (5-HT3) receptor antagonists have been reported to attenuate spinal anesthesia-induced hemodynamic changes. This study was conducted to determine whether the second generation 5-HT3, antagonist palonosetron attenuates hypotension and bradycardia during spinal anesthesia. Methods: Sixty adult patients scheduled for lower limb surgery were enrolled in this study. Patients were randomly assigned to receive either normal saline (Control group, N = 30) or palonosetron (0.075 mg, i.v.) (Palonosetron group, N = 30) prior to spinal anesthesia. Hemodynamic variables were recorded during anesthesia. Results: The mean blood pressure (MBP) were 89.2 ± 11.4 mmHg in the control group and 87.6 ± 12.1 mmHg in the palonosetron group at 10 min after intrathecal injection (P = 0.609). The median blocked levels of the control group and the palonosetron group were T10 (interquartile range, 9–10) and T10 (8–10) at 20 min after intrathecal injection (P = 0.939). Requirements for ephedrine, phenylephrine, and atropine were similar (P = 0.652, 0.533 and 0.417, respectively). The incidences of hypotension (40% vs. 41%) and bradycardia (7% vs. 17%) were comparable (P = 0.562, P = 0.198, respectively) between the control and the palonosetron group. There were no significances in the changes of systolic blood pressure, diastolic blood pressure, MBP and heart rate by the group (P = 0.632, 0.287, 0.556, 0.733, respectively). Conclusions: Intravenous palonosetron (0.075 mg) prior to spinal anesthesia might not attenuate spinal anesthesia-induced hypotension during low level of neuroaxial block for lower limb surgery.
Performance model for tempered anti-glare LCD cover glass
최정주 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.10
A novel manufacturing process for anti-glare (AG) coating is proposed for the LCD cover glass that is purposed to significantly improve the durability of AG film, which is widely implemented in commercial products designed for outdoor use. The proposed coating method is implemented in the screen-printing process, which precedes the glass-tempering process, entails application of ZBS (ZnOB 2 O 3 -SiO 2 ) to the glass surface during the silk screen-printing process, and achieves the desired level of performance through the tempering process. We also implemented the experimental results to establish the primary design parameters and derive the formulae necessary to develop a performance model that can predict the haze, roughness, and transmittance of the cover glass, which are representative specification of cover glass. Experimentation was used to subsequently verify the proposed method and the performance model.
최정주,박경렬,김만수,이의택,Choe, Jeong-Ju,Park, Gyeong-Ryeol,Kim, Man-Su,Lee, Ui-Taek 한국전자통신연구원 1997 전자통신동향분석 Vol.12 No.6
본 기고에서는 멀티미디어 컨텐트에 등장하는 애니메이션 캐릭터를 개발하는 캐릭터 모델링 시스템의 기본적인 요구기능과 캐릭터 모델링 기법을 분석하고, 상용화된 모델링 시스템 및 라이브러리를 소개, 분석한다. 앞으로 설계되는 캐릭터 모델링 소프트웨어는 모델링 및 애니메이션 시스템을 통합한 환경에서 곡면기반의 기하 모델링 소프트웨어가 주류를 이룰 것으로 전망된다. 또한 캐릭터의 외피와 같이 유연하고 부드러운 물체를 표현하기 위하여 physically based modeling 기법과 음함수 곡면이 많이 사용될 것으로 판단된다.