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최연옥(Youn-Ok Choi),이강연(Kang-Yeun Lee),조금배(Gewn-Bae Cho),백형래(Hyung-Lae Baek),이진섭(Jin-Seob Lee),최낙일(Nak-Il Choi),임병옥(Byung-Ok Lirn) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
Direct Torque Control(DTC) of AC motor has the fast torque and flux dynamic responses even though it has very simple scheme to implement.<br/> However, DTC do not show good performance at low speed range with conventional open loop stator flux observer when stator resistance varied.<br/> So, authors proposed nonlinear stator flux obsever in order to flux estimation at low speed and show its simulation results.
감시림프절 전이 양성인 유방암 환자에서 비감시림프절 전이 예측인자 및 예측체계의 비교 분석
박재영(Jae Young Park),박근명(Keun Myoung Park),박정미(Jeong Mi Park),이강연(Kang Yeun Lee),문연희(Youn Hee Moon),김세중(Sei Joong Kim),김준미(Joon Mee Kim),조영업(Young Up Cho),김장용(Jang Yong Kim),최윤미(Yun-Mee Choe),최선근(Sun K 대한외과학회 2010 Annals of Surgical Treatment and Research(ASRT) Vol.79 No.1
Purpose: The purpose of this study was to investigate the predictors of nonsentinel lymph node (NSLN) metastasis in breast cancer and to evaluate the usefulness of the scoring systems and nomograms. Methods: In this analysis, we reviewed the clinicopathologic features of 70 patients who had undergone sentinel lymph node (SLN) biopsy and axillary lymph node dissection. The clinical features of patients, histologic parameters and hormonal receptor status of primary tumor and histopathologic features of SLN metastasis were noted retrospectively. Furthermore, the receiver operating characteristic (ROC) curve was drawn and the area under the ROC curve (AUC) was calculated to assess the discriminative power of the scoring systems and nomograms. Results: The metastatic tumor size in SLN (P<0.001), extracapsular invasion (P=0.002), percentage of positive SLNs among the removed SLNs (P=0.011), primary tumor size (P=0.038) were associated significantly with NSLN metastasis, statistically, in univariate analysis. Based on multivariate logistic regression, the metastatic tumor size was the only prognostic factor of NSLN metastasis (P=0.012). The AUC of Memorial Sloan-Kettering Cancer Center scoring system was greater than other systems, significantly (P=0.004). Conclusion: We have shown in this study that it would be possible to predict NSLN status based on the metastatic tumor size in SLN. Although the significance was not achieved in multivariate analysis, the size of primary tumor, extracapsular invasion of metastasis in SLN, percentage of positive SLNs among the removed SLNs had the potential to be a predictive factor of NSLN metastasis. MSKCC scoring system appears to be more effective and accurate than other scoring systems for selecting patients for whom axillary lymph node dissection can be avoided.