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민윤기,엄규동,황규현,염광원 대한마취과학회 1981 Korean Journal of Anesthesiology Vol.14 No.4
At present, spinal anesthesia is often recommanded for a safe operation and the management of pain. However the complications from the spinal anesthesia, such as hypotension, dyspnea, nausea and vomiting, pulmonary embolism, headache, auditory and visual disturbances, lumbago, urinary difficulty and neurologic sequelae have often been reported from time to time. Thus an attempt to study the complications of spinal anesthesia, particularly the differences of complications between needle size(22 gauge and 25 gauge), has been done by our department. The following results were observed; 1) The most common sequelae of spinal anesthesia was hypotension(35.6%) and, in order frequency, urinary difficulty(23.3%), headache(16.7%), lumbago(15.3%), nausea of and vomiting(12.8%), dyspnea(8.9%), auditory and visual disturbances(0.83%) and minor neurologic sequelae(0.56%). 2) The incidence of headache and lumbago was more frequent in the 22G. group, but there were no statistically significant differences(p>0.05). 3) The incidence of headache was higher in the females than the males and there were statistically significant differences(p<0.01). 4) The incidence of lumbago was higher in the fourth decade(21.7%), and females showed a higher incidence than in males and there were statistically significant differences(p<0.05). 5) The incidence of lumbago and headache and the degree of headache was without correlation to the number of punctures in both groups(22G group and 25G group). 6) The time to postoperative urination had no correlation to the level of anesthesia.
A real-time decision model for industrial load management in a smart grid
Yu, M.,Lu, R.,Hong, S.H. Applied Science Publishers 2016 APPLIED ENERGY Vol.183 No.-
<P>The potential impacts of evolving industrial load management into demand response (DR) programs have been widely acknowledged. This paper proposes a real-time decision model for the load management of an industrial manufacturing process in the face of ever-changing real-time prices (RTPs). Due to the inherent dependence between consecutive tasks in a manufacturing process, the decision model must take future load management into consideration. The challenge lies in the uncertainty that future RTPs cannot be known in advance. In view of this, robust optimization was adopted to deal with future price uncertainties, such that the proposed model is able to make timely decisions for industrial load control when receiving the RTP for the current time slot, while considering load scheduling in future time slots. The case study was conducted on a steel powder manufacturing process; simulation results validated the effectiveness of the proposed real-time decision approach from various perspectives. (C) 2016 Elsevier Ltd. All rights reserved.</P>
Yu, M.,Ahn, K.H.,Lee, S.J. Elsevier Ltd 2016 Materials & Design Vol.89 No.-
<P>The formation of Taylor cone jet is a key process in electrohydrodynamic printing that is used to produce high resolution patterns. Even though the inks are complex fluids composed of particles, binder, and solvent, most of previous researches have assumed the ink as a Newtonian fluid. In this study, we investigate the effect of viscoelasticity of the ink on Taylor cone jet using two model systems designed to control the elasticity and viscosity of the ink independently. The elasticity and viscosity improve the stability by expanding the operating windows for Taylor cone jet. The results can be summarized in terms of two parameters: elasticity parameter, xi, and viscosity parameter, chi. The increase in elasticity widens the range of voltage for Taylor cone jet zone, while the range of flow rate remains independent of elasticity. The effect of elasticity is dominant for xi>1 while it is nearly negligible for xi<1. When the viscosity is increased, the Taylor cone jet zone is widened mainly by the flow rate when chi<1, while the voltage stabilizes the Taylor cone jet for chi>1. This study will contribute to the optimal design of EHD printing ink by providing the operating window maps in terms of material properties. (C) 2015 Elsevier Ltd. All rights reserved.</P>
Carbon nanotubes/aluminum composite as a hydrogen source for PEMFC
Yu, M.,Kim, M.,Yoon, B.,Oh, S.,Nam, D.H.,Kwon, H. Pergamon Press ; Elsevier Science Ltd 2014 International journal of hydrogen energy Vol.39 No.34
Al matrix composites reinforced with 0-5 vol. % carbon nanotubes (CNTs) were fabricated by spark plasma sintering (SPS) to examine their hydrogen generation properties from the hydrolysis of Al in 10 wt. % NaOH solution at room temperature. The 5 vol. % CNTs/Al composite exhibits a maximum hydrogen generation rate of 120 ml/min g, which is about 6 times higher than that of Al without CNTs due to the synergetic effects of the porous Al matrix, which has a large reaction area and galvanic corrosion between the Al matrix and the CNTs. The hydrogen gas generated from the hydrolysis of the CNTs/Al composite has high purity without any production of undesirable CO. PEMFC produced electricity at 10 A and 0.73 V for 13 min, with hydrogen generated from the hydrolysis of 3.5 g-5 vol. % CNTs/Al composite. The CNTs/Al composite was effectively used as a hydrogen source for PEMFC.
Phylogenetic classification of Brucella species based on whole genome sequencing
Eun Ji Yum(Eun Ji Yum),Jin Ju Lee(Jin Ju Lee),Se-Chul Kim(Se-Chul Kim),Sung Dae Yang(Sung Dae Yang),Min Hoe Lee(Min Hoe Lee),Bang-Hun Hyun(Bang-Hun Hyun),Moon Her(Moon Her),Hee Soo Lee(Hee Soo Lee) 한국예방수의학회 2018 한국예방수의학회 학술대회자료집 Vol.2018 No.-
A Study on the Relational Analysis of Human Errors in Railway Accidents
Byeoung-Soo YUM(Byeoung-Soo YUM),Tae-Yoon KIM(Tae-Yoon KIM),Jong-Uk WON(Jong-Uk WON),Chi-Nyon KIM(Chi-Nyon KIM),Won-Mo GAL(Won-Mo GAL) 한국웰빙융합학회 2024 웰빙융합연구 Vol.7 No.1
Purpose: This study examines the persistent occurrence of railway accidents despite numerous safety devices, highlighting the multifaceted nature of these incidents. Research design, data and methodology: Utilizing the 4M analysis method, the research investigates a decade’s worth of accident reported from the Aviation and Railway Accident Investigation Board to identify risk factors and suggest mitigation measures. Results: The analysis reveals that 57% of railway accidents are attributed to human factors, followed by mechanical (28%), environmental (7%), and management (8%) factors. Conclusions: The study underscores the necessity of prioritizing safety and establishing a unified organizational approach to prevent human error accidents. It calls for an alignment of risk perception between headquarters and field operations, advocating for educational and perceptual changes, as well as systematic improvements to achieve safety goals.