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119구급차로 이송된 환자의 병원 전 전문응급처치에 관한 조사
박진옥,이경희,노상균,최청숙 한국응급구조학회 2003 한국응급구조학회지 Vol.7 No.1
An analysis was performed to evaluate the prehospital advanced emergency care in Emergency Medical Service system(EMS) through the review of the 119 transport records of 190 patients who visited to Jecheon Seoul hospital emergency center at Chungpuk Jecheon via 119 system during the period from October 2002 to September 2003. The results were obtained as follows: 1. Among 190 patients, male were 127(66.8%) and female were 63(33.2%) and non-traumatic patients were 81(42.6%) and traumatic patients were 109(57.4%). 2. The analysis of prehospital care by Emergency Medical Technician(EMT) revealed that Airway maintenance and keeping oral airway(37.7%), oxygen supply(75.9%), Tourniquett or MAST(18.9%), Immobilization of neck or spine(94.7%), Immobilization of extremities(51.4%), wound bandage and dressing(25.0%), BCLS(12.1%) and Application of AED(2 patients). 3. The analysis of prehospital care by EMT revealed prehospital care was limited to keep of intubation or LMA, medication and IV insertion, insertion of gastric tube and ACLS. 4. There was no case of the notification to medical institute or consultation to doctor.
Manuel V. Canté,José E. Spinelli,Noé Cheung,Amauri Garcia 대한금속·재료학회 2010 METALS AND MATERIALS International Vol.16 No.1
Al-Ni hypoeutectic alloys were directionally solidified under upward transient heat flow conditions. The aim of the present study is to set up correlations between the as-cast microstructure and the resulting mechanical properties of these alloys. The dependence of primary and secondary dendrite arm spacing on the alloy solute content and on solidification thermal parameters is also analyzed. The results include transient metal/mold heat transfer coefficient, tip growth rate, cooling rate, dendrite arm spacing, ultimate tensile strength, yield tensile strength and elongation. Expressions relating dendrite spacing to solidification thermal parameters and mechanical properties to the scale of the dendritic microstructure have been determined. It was found that the ultimate tensile strength and the yield tensile strength increase with increasing alloy solute content and with decreasing primary and secondary dendrite arm spacing. In contrast, the elongation was found to be independent of both alloy composition and dendritic arrangement.
Talita A. Vida,Crystopher Brito,Thiago S. Lima,José E. Spinelli,Noé Cheung,Amauri Garcia 한국물리학회 2019 Current Applied Physics Vol.19 No.4
Zn-Mg alloys are considered to have potential application in bone implants, since both metals are biocompatible and have biodegradable characteristics. Adding Mg to Zn can boost mechanical and corrosion resistances. However, the literature is very limited on quantifying the interrelation of solidification parameters, microstructural features and mechanical/corrosion properties of Zn-Mg alloys. The present study examines the interrelations of alloy Mg content, macrosegregation effects, morphology and scale of the matrix and eutectic phases, nature of intermetallics and tensile and corrosion properties of near-eutectic Zn-Mg alloys. The alloys samples are obtained by unsteady-state directional solidification resulting in a wide range of solidification thermal parameters and microstructures. We examine microstructural features of both dendritic and complex regular eutectic phases. It is shown that the eutectic exhibits a bimodal pattern with neighboring areas of coarse and fine lamellae. Experimental growth laws relating the primary, secondary and eutectic spacings to the solidification cooling rate and growth rate are proposed. Hall-Petch type equations are derived expressing tensile strength and elongation to dendritic and eutectic spacings. Electrochemical parameters determined by polarization curves during corrosion tests and SEM analyses of corroded areas have shown that the alloy having an essentially eutectic microstructure is associated with better corrosion resistance.
Effect of Microstructure Features on the Corrosion Behavior of the Sn‑2.1 wt%Mg Solder Alloy
Clarissa Cruz,Thiago Lima,Marco Soares,Emmanuelle Freitas,Eric Fujiwara,Amauri Garcia,Noé Cheung 대한금속·재료학회 2020 ELECTRONIC MATERIALS LETTERS Vol.16 No.3
The Sn–Mg eutectic alloy is a potential replacement for the traditional Sn-38.1 wt%Pb solder alloy, since lead has been bannedbecause of its risk to human health and the environment. However, studies in the literature related to the Sn-2.1 wt%Mgalloy are restricted to mechanical, electrical and thermal properties. Therefore, this study aims to evaluate the corrosionbehavior of this alloy, as a function of the microstructural arrangement obtained from directional solidifcation performedin a transient heat extraction regime. The thermal solidifcation parameters (solidifcation growth rate and cooling rate) weredetermined along the length of the casting for correlations with microstructural features. The resulting microstructure wascharacterized by scanning electron microscopy, energy-dispersive X-ray spectroscopy and X-ray difraction. Subsequently, theelectrochemical impedance spectroscopy, linear polarization, equivalent circuit and evolution of hydrogen release analyzeswere performed to evaluate the corrosion behavior of the samples in a 0.5 M NaCl solution at 25 °C. Interphase spacingand Mg2Sn fraction were found to infuence the corrosion behavior, showing higher corrosion resistance for a more refnedmicrostructure.
Adilson V. Rodrigues,Thiago S. Lima,Talita A. Vida,Crystopher Brito,Amauri Garcia,Noé Cheung 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.5
Al–Cu–Ni alloys are of scientifi c and technological interest due to high strength/high temperature applications, based on thereinforcement originated from the interaction between the Al-rich phase and intermetallic composites. The nature, morphology,size, volume fraction and dispersion of IMCs particles throughout the Al-rich matrix are important factors determiningthe resulting mechanical and chemical properties. The present work aims to evaluate the effect of the addition of 1wt%Ni intoAl–5wt%Cu and Al–15wt%Cu alloys on the solidification rate, macrosegregation, microstructure features and the interrelationsof such characteristics on tensile and corrosion properties. A directional solidification technique is used permitting awide range of microstructural scales to be examined. Experimental growth laws relating the primary and secondary dendriticspacings to growth rate and solidification cooling rate are proposed, and Hall–Petch type equations are derived relating theultimate tensile strength and elongation to the primary dendritic spacing. Considering a compromise between ultimate tensilestrength and corrosion resistance of the examined alloys samples from both alloys castings it is shown that the sampleshaving more refined microstructures are associated with the highest values of such properties.