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윤정현,권형주,김은경,문희정,곽진영 대한초음파의학회 2016 ULTRASONOGRAPHY Vol.35 No.1
Purpose: The goal of this study was to validate the ultrasonography (US) and cytopathological features that are used in the diagnosis of the follicular variant of papillary thyroid carcinoma (FVPTC) and to characterize the role of BRAFV600E mutation analysis in the diagnosis of FVPTC. Methods: From May 2012 to February 2014, 40 thyroid nodules from 40 patients (mean age, 56.2 years; range, 26 to 81 years) diagnosed with FVPTC were included in this study. The US features of the nodules were analyzed and the nodules were classified as probably benign or suspicious for malignancy. Twenty-three thyroid nodules (57.5%) underwent BRAFV600E mutation analysis. Clinical information and histopathologic results were obtained by reviewing the medical records of the patients. Results: Thirty nodules (75.0%) were classified as suspicious for malignancy, while 10 (25.0%) were classified as probably benign. Seven of the eight nodules (87.5%) with atypia of undetermined significance/follicular lesion of undetermined significance (AUS/FLUS) cytology showed suspicious US features, while one of the two nodules (50.0%) with follicular neoplasm cytology presented suspicious US features. Five of the 23 nodules (21.7%) that underwent BRAFV600E mutation analysis had positive results, all of which were diagnosed as suspicious for malignancy or malignant based on cytology. None of the nodules with benign, AUS/FLUS, or follicular neoplasm cytology were positive for the BRAFV600E mutation. Conclusion: US features allow nodules to be classified as suspicious for malignancy, and the presence of suspicious US features in nodules with ambiguous cytology may aid in the diagnosis of FVPTC. BRAFV600E mutation analysis is of limited value in the diagnosis of FVPTC.
시간 지연 없는 서브밴드 적응 필터 구조를 사용한 능동 소음 제어 알고리듬
윤정현,박영철,윤대희,차일환 한국음향학회 1998 韓國音響學會誌 Vol.17 No.3
본 논문에서는 시간 지연이 없는 서브밴드 필터 구조를 사용한 능동 소음 제어 시 스템을 제안하였다. 제안된 시스템은 기준 입력 신호와 2차 경로의 전달 함수를 컨볼루션하 여 만들어지는 filtered reference 신호가 서브밴드내에서 생성될 수 있도록, 2차 소음원과 오차 센서 사이의 전기·음향학적인 경로를 나타내는 2차 전달 함수를 각 서브밴드로 재구 성함으로써, 알고리듬 구현시 계산량을 감소시킨다. 또한 2차 경로의 전달함수가 시간에 따 라 변화하는 경우에도 능동 소음 제어 시스템의 소음 제어 성능을 유지할 수 있도록, 각 밴 드마다 두 개의 적응필터를 사용한 on-line 시스템 인지 구조를 제안하여 on-line 시스템 인 지에 필요한 계산량을 감소시켰다. 본 논문에서 제시한 능동 소음 제어 시스템의 제어 성능 과 on-line 시스템 인지 성능을 모의 실험을 통하여 검증하였다.
일개 약학대학 실무실습교육 후 학생의 실무교육기관 및 프리셉터 평가
윤정현,서혜선,제남경 한국임상약학회 2017 한국임상약학회지 Vol.27 No.2
Objective: This study was conducted to assess the current status of experiential education, by analyzing pharmacy students’satisfaction and evaluation for practice sites and preceptors for 3 years from 2014 through 2016. Methods: Students evaluated thepractice sites and preceptors using a 5-point and a 4-point Likert scale, respectively. Analysis was performed based on the typesof curriculums and practice sites. In addition, sub-analysis was conducted based on the types of health-system pharmacy and thecommunity pharmacy. Results: Total 203 students responded to the survey questionnaires. The 3-year average score of students’satisfaction with practice sites was 4.25. In the sub-analysis conducted based on the types of health-system pharmacy, the scorewas higher in the tertiary hospital pharmacies than that of the general hospital pharmacies (4.49 vs. 4.06, P<0.001). For communitypharmacy, the difference in the score of the 3-year analysis was not significant, depending on the types (4.51 vs. 4.33, P=0.054). The average score of students’ evaluation on the preceptors was 3.37 in the 3-year analysis. The score was significantly higher forthe preceptors of tertiary hospital pharmacies than those of general hospital pharmacies (3.61 vs. 3.25, P<0.001). For communitypharmacy, no significant differences were found, depending on the types of pharmacy (3.53 vs. 3.43, P=0.309). Conclusion: Thestudents' satisfaction with practice sites and preceptors in pharmacy experiential education was high. However, it varied greatlydepending on the types of educational institutions. Mutual effort between university and educational institutions is required, tonarrow the gap in the degree of students’ satisfaction.