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양필성,박제욱,이영준,김동준,Seng Chan You,박동혁,엄재선,김남균 대한심장학회 2015 Korean Circulation Journal Vol.45 No.4
Implantable cardioverter-defibrillator (ICD) therapy is acknowledged as a valid treatment method for the effective prevention of sudden cardiac death, which is a major cause of mortality in adult congenital heart disease patients. But ICD implantation by the conventional transvascular approach is not always possible in patients who have undergone palliative surgery due to congenital and structural heart disease. Here, we report a case in which an ICD was transvascularly implanted in an arrhythmogenic right ventricular cardiomyopathy patient who had undergone a one-and-a-half ventricle repair.
양필성(Pil Sung Yang),김진수(Jin Soo Kim),허혁(Hyuk Hur),민병소(Byung Soh Min),김남규(Nam Kyu Kim) 대한외과학회 2009 Annals of Surgical Treatment and Research(ASRT) Vol.76 No.5
Duplicated inferior vena cava (IVC) is a congenital anomaly seen rarely in the general population. Patients with IVC variants usually do not present any symptoms and are found incidentally in many cases. However, physicians are urged to recognize the presence of such anomalies during diagnostic or invasive procedures as these variants of blood vessel systems can impose substantial implications in certain clinical situations. Subsequently, information about IVC variants may become critical if surgical injuries or predisposing conditions act as life-threatening risks to patients during medical procedures. We present a case of duplicated IVC in a 68?year?old female patient with rectal cancer where an IVC anomaly was found during surgical resection of her tumor. From our experience, we emphasize the importance of having the knowledge of IVC variations in patients undergoing invasive surgical procedures which may involve large vessels.
CDN 환경에서의 동적 콘텐츠 캐싱을 위한 콘텐츠 뷰카운트 예측 및 인기 콘텐츠 판별
양우식,김동화,김형석,송서하,강필성 대한산업공학회 2019 대한산업공학회지 Vol.45 No.5
The content delivery network (CDN) provides an environment in which a large amount of contents can betransmitted stably and quickly from suppliers to consumers. However, as high quality and large capacitycontents are produced and consumed, a more efficient content caching technique is required in CDN. It is acommon phenomenon that a small number of contents occupy the most demands in CDN. To relieve thepossible problems caused by this phenomenon, we propose a hybrid content-level viewcount forecasting methodbased on moving average and Prophet for dynamic contents caching to support an optimized dynamic contentscaching in CDN. Based on the predicted viewcount, each content is classified into either hot or cold contents foreach day to help dynamic content allocation: hot contents are allocated in a fast but expensive storage while coldcontents are allocated in a slow but inexpensive storage. Experimental results show that the proposed methodyields better hot/cold contents classification performance than benchmark methods.
Changes in Cardiovascular Health Status and Risk of Sudden Cardiac Death in Older Adults
김민,양필성,유희태,김태훈,장은선,엄재선,박희남,이문형,정보영 연세대학교의과대학 2021 Yonsei medical journal Vol.62 No.4
Purpose: Cardiovascular health (CVH) status is associated with several cardiovascular outcomes; however, correlations betweenchanges in CVH status and risk of sudden cardiac death (SCD) are unknown. We aimed to evaluate associations between changesin CVH status and risk of SCD and all-cause death in older adults. Materials and Methods: We used data from the Korea National Health Insurance Service-Senior cohort database (2005–2012). Sixmetrics from the American Heart Association (smoking, body mass index, physical activity, blood pressure, total cholesterol, andfasting blood glucose) were used to calculate CVH scores. Changes in CVH status between two health checkups were categorizedas low to low, low to high, high to low, and high to high. Results: We included 105200 patients whose CVH status for an initial and follow-up health checkup (2-year interval) was available. During a median of 5.2 years of follow-up after a second health checkup, 688 SCDs occurred. Compared to patients with apersistent low CVH status, those with a consistently high CVH status had a reduced risk of SCD [adjusted hazard ratio (HR), 0.69;95% confidence interval (CI), 0.56–0.86] and all-cause death (adjusted HR, 0.74; 95% CI, 0.69–0.78). The risk of all-cause death followedsimilar trends. However, an inconsistent linear relationship was observed for changes in CVH status and the risk of SCD,but not of all-cause death. Conclusion: Maintaining a high CVH status was associated with future risks of SCD and all-cause death among an older adultpopulation.