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당뇨병성 신경병증 진단법의 유용성 ( 예비보고 ) - Feldman 등의 2 단계 진단법에 대하여 -
신영구(Young Goo Shin),오윤정(Yoon Jung Oh),고영윤(Young Yoon Ko),이성근(Seong Keun Lee),이성규(Seong Kyu Lee),정윤석(Yoon Sok Jung),이관우(Kawn Woo Lee),김현만(Hyeon Man Kim) 대한내과학회 1998 대한내과학회지 Vol.54 No.6
N/A Objectives: It is important to consider the symptoms of diabetic neuropathy in determining a diagnostic approach. To evaluate diabetic neuropathy, an appropriate questionnaire for Korean diabetic patients is required. In 1994, Feldman et al. proposed the two-step diagnostic approach which included a questionnaire. To adapt a diagnostic approach and questionnaire for Korean diabetics, we initially diagnosed diabetic neuropathy by using Feldman's method and by assessing the efficiency of their method for Korean diabetics as a preliminary study. Methods: We diagnosed diabetic neuropathy with Feldman's method in 99 NlDDM patients who visited Ajou university hospital from October 1, 1996 to April 30, 1997. The sensitivity and specificity of Feldman's diagnostic procedures were ebaluated. To include the highly specific symptoms in the diagnostic approach, we applied a different scaring system (from 5 to 1) to the questionnaire accroding to specificity and then evaluated the sensitivity and specificity with this new system. If the sensitivity and specificity were 60% or more, the new scoring system was regarded as clinically useful. Results: Using Feldman's method, the sensitivity of MNSIQ and MNSIC was 12.8% and the specificity was 88.3% and 98.3%, respectively. The sensitivity of MDNS and NCV was 100% and the specificity was 68.3% and 61.6%, respectively. The new scoring system consisted of 13 of 15 questions with sensitivity of 46.2% and specificity of 71.7%, omitting 2 questions due to possible relation to vascular symptoms. Among the 4 diagnostic procedures, the strongest correlation existed between MDNS and NCV. None of the procedures had a significant correlation with MNSIQ. MNSIC, which shares similar characteristics with MDNS, had significant correlation with MDNS and NCV, but its sensitivity was very low. Conclusion: MNSIQ and MNSIC were not useful as screening instruments in the dignostic approach to diabetic neuropathy using Feldman's method, Thus, a new questionnaire composed of symptoms common in Korean diabetic patients should be designed, and MNSIC could be omitted from the diagnostic approach.
자기등가회로-등각사상 결합 해석적 기법을 이용한 매입형 영구자석 전동기의 무부하 특성 해석
황영호(Young-Ho Hwang),고영윤(Young-Yoon Ko),김형우(Hyung-Woo Kim),김용재(Yong-Jae Kim),정상용(Sang-Yong Jung) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.11
해석적 기법의 종류로 자기등가회로 (Magnetic Equivalent Circuit, MEC) 기법과 등각사상(Conformal Mapping, CM) 기반 기법이 있다. 자기등가회로 기법은 복잡한 회전자 형상의 자계 특성을 분석할 수 있으나 상세한 자계 분포를 나타내지 못한다. 반면 등각사상 기반 기법은 상세한 자계 분포를 나타낼 수 있으나 복잡한 회전자 형상의 자계 특성을 분석하기 힘들다는 단점이 있다. 따라서 본 논문에서는 자기등가회로와 등각사상을 결합한 해석적 기법을 이용하여 매입형 영구자석 전동기의 무부하 특성 해석을 수행하였다. 유한요소법 (Finite Elements Method, FEM)을 이용하여 본 논문에서 사용된 해석적 기법의 타당성을 확인하였다.