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정진만,김용현,유성욱,오경미,김치경,송태진,김용재,김범준,허성혁,박광열,김정민,박종호,최재철,박만석,김준태,최강호,황양하,정종원,방오영,김경문,서우근 대한신경과학회 2019 Journal of Clinical Neurology Vol.15 No.4
Background and Purpose Te clinical implications of echocardiography fndings for longterm outcomes in atrial fbrillation (AF)-related stroke patients are unknown. Methods Tis was a substudy of the Korean ATrial fbrillaTion EvaluatioN regisTry in Ischemic strOke patieNts (K-ATTENTION), which is a multicenter-based cohort comprising prospective stroke registries from 11 tertiary centers. Stroke survivors who underwent twodimensional transthoracic echocardiography during hospitalization were enrolled. Echocardiography markers included the lef-ventricle (LV) ejection fraction (LVEF), the lef atrium diameter, and the ratio of the peak transmitral flling velocity to the mean mitral annular velocity during early diastole (E/eʹ ratio). LVEF was categorized into normal (≥55%), mildly decreased (>40% and <55%), and severely decreased (≤40%). Te E/eʹ ratio associated with the LV flling pressure was categorized into normal (<8), borderline (≥8 and <15), and elevated (≥15). Kaplan-Meier and Cox regression analyses were performed for recurrent stroke, major adverse cardiac events, and all-cause death. Results Tis study fnally included 1,947 patients. Over a median follow-up of 1.65 years (interquartile range, 0.42–2.87 years), the rates of recurrent stroke, major adverse cardiac events, and all-cause death were 35.1, 10.8, and 69.6 cases per 1,000 person-years, respectively. Multivariable analyses demonstrated that severely decreased LVEF was associated with a higher risks of major adverse cardiac events [hazard ratio (HR), 3.91; 95% confdence interval (CI), 1.58–9.69] and all-cause death (HR, 1.95; 95% CI, 1.23–3.10). Te multivariable fractional polynomial plot indicated that recurrent stroke might be associated with a lower LVEF. Conclusions Severe LV systolic dysfunction could be a determinant of long-term outcomes in AF-related stroke.
Telometer를 이용한 슬관절 측부인대 Stress-radiogram의 재현성 비교평가
정진만,정성빈,김상현,이정훈 대한방사선과학회 2018 방사선기술과학 Vol.41 No.6
Telometer is a supplementary filming device that improves the image quality and minimizes the motion unsharpness by enhancing the reproducibility of diagnostic images because it applies constant pressure (force) to the affected area. The stress-radiogram which is widely used to provide the o-bjective quantitative stability of knee ligament is reported in literature as the most suitable method to evaluate the stability of ligament and it is advised to use the Telometer. In order to evaluate the image reproducibility of the Telometer, the collateral ligament which is the most vulnerable among the ligaments consisting of the knee joint, the stress-radiogram was executed in the order of the Telometer, the push pull gauge and the conventional stress radiogram. Then, SPSS (Statistical Package for the Social Science) for Windows 22.0 was used for comparison and evaluation. According to the results of comparison and evaluation, the standard errors and standard deviations became smaller in the order of the Telometer, the push pull gauge, the conventional stress radiogram while the image reproducibility was higher in the order of the Telometer, the push pull gauge, the conventional stress radiogram. Therefore, it is considered that the use of the TELOS for stress-radiogram would enhance the quality of patient diagnostic images and the work performance of radiologists.
플랜트 시설에서 지연시간 감소를 위한 동적 듀티사이클 조절 기법
정진만,윤지섭,윤영선,소선섭,은성배 한국인터넷방송통신학회 2016 한국인터넷방송통신학회 논문지 Vol.16 No.1
안전한 플랜트 설비의 상태 감시 및 장애 진단을 위해 무선 센서를 이용한 플랜트 설비용 모니터링 시스템이 연구되고 있다. 플랜트 설비에서는 저전력 뿐만 아니라 안전사고와 직결된 긴급 상황시 실시간성도 고려해야 한다. 본 논문에서는 플랜트 시설에서 지연시간 감소를 위한 동적 듀티사이클 조절 기법을 제안한다. 제안된 동적 듀티사이클 조절 기법은 센싱된 데이터 값의 긴급한 정도에 따라 미리 정의된 위험 그룹으로 구분하여 적응적으로 듀티사이클 주 기를 조절한다. 실시간성을 평가하기 위해 고정 듀티사이클 기법과 동적 듀티사이클의 예상 지연시간을 확률적으로 분 석하였다. 비교 결과, 플랜트 시설과 같이 이상 징후 발생 시 에너지를 소모하더라도 실시간성을 제공해야 하는 상황에 서 제안 동적 듀티사이클 기법이 더 효과적임을 확인하였다. For environmental monitoring and risk identification of industrial plants, several monitoring systems using Wireless Sensor Networks (WSNs) have been developed. In this paper, we propose a dynamic duty cycle adjustment mechanism for reduced latency in industrial plants. The proposed method adjusts the duty cycle among predefined risk groups depending on the urgency of sensed data values. To demonstrate its efficacy, we analyze the expected transmission latency model and then discuss the characteristics in detail. We show that the proposed dynamic duty cycle mechanism is a more effective than a periodic mechanism by analyzing the expected latency of them in industrial plants where there are various types of sensory data with different levels of reliability.