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응급처치 질향상방안을 위한 제언 : 병원전 119 구급대 중심으로
이승한,서병권 한국안전교육학회 2000 한국안전교육학회지 Vol.3 No.1
The quality of emergency care on site should be dealt with systematically within the emergency medical service. Through such emergency medical service system, emergency care on site to promote life saving measures can be implemented comprehensively. Prehospital emergency care is usually provided by the 119 emergency medical service. Patient's life depends on the performance by the emergency medical service when physician's availability is lacking, especially, on site of accident. By assessing and classifying emergency patients on site by degree of injury, the quality of 119 emergency medical care service can be improved.
이승한,하기룡,정용욱,장석수,여인동 대한토목학회 2014 KSCE JOURNAL OF CIVIL ENGINEERING Vol.18 No.5
This study examined the effect of sodium polyacrylate (PAANa) absorbent on the characteristics of mortar. PAANa wassynthesized through inverse emulsion polymerization with varying amounts (e.g., 0.150.60 mol%) of cross-linking agent N,N'-Methylene Bisacrylamide (MBA). The polymerized PAANa was added to cement in amounts of 0.5%, 1.0%, and 1.5% (v/v) toproduce mortar. Flow, compressive/flexural strength, Field-Emission Scanning Electron Microscopy (FE-SEM) analysis andporosity characteristics of the as-prepared mortar were subsequently measured. The test result shows that the flow properties ofmortar decreased with the volume of PAANa added whereas it increased with the MBA mixing ratio. The sample prepared with 15%of MBA and 1.0% of PAANa (e.g., C15CA1.0) showed the highest compressive strength (29.0 MPa) after an aging of 28 days,which represents 31% improvement in strength compared to plain mortar (22.1 MPa). Compressive strength was observed to drop asthe amount of MBA in the mixture increased. C15CA1.0 material also showed the highest flexural strength (2.7 MPa) after 28 daysaging, which represents an 8% improvement over plain mortar. C30CA1.0 and C45CA1.0 materials showed moderate improvementsin flexural strength (5% and 2%, respectively) whereas, a further increase in MBA (C60CA1.0) led to poorer performances (2%lower flexural strength) compared to plain mortar. FE-SEM analysis of C15CA1.0 revealed the presence of high amounts of acicularC-S-H crystals where the space between particles is filled with PAANa. The content of acicular structure in mortar was found toincrease with the MBA mixing ratio. The modified materials showed lower porosity values compared to plain mortar, and thesevalues increased with the amount of MBA in the mixture.