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윤종근,김희진 대한금속재료학회(대한금속학회) 1989 대한금속·재료학회지 Vol.27 No.7
The purpose of this study is to clarify the critical factor controlling the HAZ toughness of high strength steel. The HAZ toughness has been known to be directly associated with the characteristics of local brittle zone (LBZ) having lowest toughness within the coarse grained HAZ. The microstructural sources for LBZ, identified in this study as the intercritically reheated coarse grained HAZ, were confirmed to be the presence of MA constituent formed in the coarse grained microstructure. The amount of the M-A constituent, which controls the HAZ toughness. is strong1y dependent on both the conditions of weld thermal cycle and the chemical composition of base metal. The amount of the MA constituent formed in the TMCP steel decreases significantly with increasing the cooling time, while that in the normalized steel does not. This fact can explain the effect of welding heat input on the HAZ toughness of TMCP steel and normalized steel reported in Part l.
윤종근,이병국 한국화재소방학회 2013 한국화재소방학회논문지 Vol.27 No.5
Application of the left lateral tilt position has been recommended during cardiopulmonary resuscitation (CPR) of pregnant patients. However, the left lateral tilt could displace the left ventricle (LV) besides the gravid uterus and may compromise the cardiac pump mechanism of CPR. Thus, we investigated the effect of left lateral tilt on the spatial relationship between the anterior-posterior axis (AP axis), which represents the direction of sternal displacement during CPR, and the LV. We retrospectively reviewed the medical records and multidetector computed tomography (MDCT) scans of 90patients who underwent virtual gastroscopy using MDCT. Virtual gastroscopy was performed with the patient both in the left lateral tilt position and in the supine position. On an axial image showing the maximal area of the LV, the angle between the AP axis and the LV axis (AngleAP-LV), the shortest distance between the AP axis and the mid-point of LV cavity (DAP-MidLV) and the shortest distance between the AP axis and the LV apex (DAP-Apex) were measured. In the supine scans, the LV was situated on the left side of the AP axis in 87 patients (96.7%). On the left lateral tilt scans, the mean tilt angle was 43.4±11.0o. DAP-MidLV and DAP-Apex were significantly longer in the left lateral tilt position (p<0.001), but AngleAP-LV was comparable between the positions. This study indicates that the left lateral tilt position may compromise the cardiac pump mechanism of chest compression in pregnant cardiac arrest patients. Application of the left lateral tilt position has been recommended during cardiopulmonary resuscitation (CPR) of pregnantpatients. However, the left lateral tilt could displace the left ventricle (LV) besides the gravid uterus and may compromisethe cardiac pump mechanism of CPR. Thus, we investigated the effect of left lateral tilt on the spatial relationshipbetween the anterior-posterior axis (AP axis), which represents the direction of sternal displacement during CPR, and theLV. We retrospectively reviewed the medical records and multidetector computed tomography (MDCT) scans of 90patients who underwent virtual gastroscopy using MDCT. Virtual gastroscopy was performed with the patient both in theleft lateral tilt position and in the supine position. On an axial image showing the maximal area of the LV, the anglebetween the AP axis and the LV axis (AngleAP-LV), the shortest distance between the AP axis and the mid-point of LV cavity(DAP-MidLV) and the shortest distance between the AP axis and the LV apex (DAP-Apex) were measured. In the supinescans, the LV was situated on the left side of the AP axis in 87 patients (96.7%). On the left lateral tilt scans, the mean tiltangle was 43.4±11.0o. DAP-MidLV and DAP-Apex were significantly longer in the left lateral tilt position (p<0.001), butAngleAP-LV was comparable between the positions. This study indicates that the left lateral tilt position may compromisethe cardiac pump mechanism of chest compression in pregnant cardiac arrest patients.
윤종근 사단법인 한국응급구조학회 2019 한국응급구조학회지 Vol.23 No.1
Purpose: The study aims to provide basic data to enhance the health of paramedics responsible for patient transport and treatment by analyzing the exposure level of paramedics to electromagnetic waves generated by electric devices used in ambulances. Methods: The study measured electromagnetic waves in ambulances in N region from July to December 2018. ME3030B produced by German Gigahertz Solutions was used to measure these waves and the maximum value was selected by moving it slowly in various directions. Each measurement part was selected and the mean value was calculated by repeatedly measuring at 10-minute intervals three times in total: 1st, 2nd, and 3rd phase. Results: Among the electrical devices installed in the patient room of the ambulance measured at distances of 1cm or 30cm, results showed a high level of electric waves at the inverter (26.25±39V/m) and high level of electromagnetic waves (564.00±31.75nT) at the ozone sterilizer. According to measurements toward the front near the driver’s seat, results indicated high levels of electric waves (3.67±1.15V/m) and electromagnetic waves (450.00±19.52nT) at the black box hard drive. Conclusion: Electromagnetic waves within the ambulance were stable and not beyond the range that might impact human health. However, in the case of the black box hard drive (3.67±1.15V/m, 450.00±19.52nT) located under the passenger seat, it may have a direct effect on the human body and, thus it is necessary to move it to a storage area further away from the paramedics to minimized the impact.