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최의근(E. K. Choi),이상욱(S. W. Lee) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
In this study, the repetitive loading-unloading tensile tests with AZ31B magnesium sheet metal have been conducted under various elevated temperatures to check out how the Young’s moduli of the sheets evolve during the plastic deformation. The loading-unloading tests have been carried out at every 1% of strain increment. With the tested results, some damage parameters of magnesium sheets based on the Lemaitre’s continuum damage theory could be calculated at room temperature, 100℃, 150℃, and 250℃. It has been shown that the critical damage parameters obtained in all temperature conditions are within the range of 0.12 to 0.18.
2018 대한부정맥학회 심방세동 환자의 심박수 조절 지침
임우현,최의근,정보영,최기준 대한내과학회 2018 대한내과학회지 Vol.93 No.2
Atrial fibrillation (AF) is characterized by irregular and relatively rapid heart rate, which occasionally causes symptoms such as palpitations, dyspnea, or reduced exercise capacity. Controlling the ventricular rate is a mainstay for the symptom management of patients with AF. Rate control can be achieved with beta-blockers, non-dihydropyridine calcium channel blockers, digoxin, or combination therapy. Rhythm control is an option for patients in whom appropriate rate control cannot be achieved or who have persistent symptoms despite rate control. The choices of drug and target heart rate are usually specified by international guidelines for AF management. However, pivotal trials included in those guidelines enrolled only a small number of Asian subjects, which limit application of those guidelines to a Korean population. The Korean Heart Rhythm Society organized the Korean AF Management Guideline Committee and analyzed all available studies regarding management of AF including studies with Korean patients. Then, expert consensus or guidelines for optimal management in Korean patients with AF were achieved after systematic review with intensive discussion. This article provides general principles for rate control therapy in Korean patients with AF.
이소령,최의근,강도윤,차명진,조영진,오일영,오세일 대한심장학회 2014 Korean Circulation Journal Vol.44 No.1
Background and Objectives: Heart failure (HF) patients display more varied QRS duration. We investigated whether QRS variability during hospitalization for acute decompensated HF is associated with poor clinical outcomes after discharge. Subjects and Methods: One hundred seventy three patients (64% males; age 60±13 years) admitted for acute decompensated HF with severe left ventricular (LV) dysfunction (LV ejection fraction ≤35%) were consecutively enrolled. QRS variability was calculated by the difference between maximum and minimum QRS duration acquired during hospitalization. The prognostic implications on composite endpoints of death or urgent heart transplantation were analyzed. Results: Forty-two patients (24.3%) died and three patients (1.7%) underwent urgent heart transplantation during the follow-up of 51±18 months. Patients who reached composite endpoints (n=45) showed greater QRS variability than those who did not (n=128) (20±23 ms vs. 14± 14 ms, p=0.046). Patients who had high QRS variability (more than 22 ms; n=36) tended to have a higher event rate than those with QRS variability <22 ms {39% vs. 23%, hazard ratio (HR), 1.88; 95% confidence interval (CI) 1.001-3.539, p=0.05}. Adjusting with other variables, high QRS variability was an independent predictor for composite outcome (HR 1.94; 95% CI 1.023-3.683, p=0.042). Conclusion: QRS variability measured during hospitalization for acute decompensated HF has a prognostic impact in HF patients with severe LV dysfunction.