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박소라,김관영,최창민,송관재,박준현,Kichan Jeon,이순영,김태윤,이지은,이상원,박성욱,장재만,김동명,김대환 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.5
The comparative study on Program/Erase (P /E) efficiency of three-dimensional (3-D) SONOS memory cell transistors is performed by comparing Double Gate (DG), FinFET with Gate All Around (GAA) structures. GAA-CAT is superior to DG-CAT and/or Fin-CAT in terms of all of P /E efficiency, low voltage operation and the integration density. It is shown that this superiority results from the higher FN current in P /E condition (due to the E-field concentration effect) rather than the gate controllability in a read operation condition. Furthermore, as DSi decreases, the superiority of GAA-CAT becomes more prominent due to the feature of the E-field concentration effect. It is shown that GAA-CAT is very promising candidate for a low voltage P /E efficient flash memory cell transistor. Remaining or further challenging issues will be the body bias control and the scheme for an erasure in block units. In terms of the retention properties, both GAA-CAT and DG-CAT show the superior retention to Fin-CAT due to the corner effect of Fin-CAT. In the case of Fin-CAT, the maximum E-field is higher by 1.5 times than that of GAA-CAT and retention characteristic of Fin-CAT is inferior to those of GAA-CAT and DG-CAT by about three orders of magnitude.
박소라,강영란,곽충환,황석재,정영훈,황진용,서명기,강민경,안연정,조정현 대한심장학회 2009 Korean Circulation Journal Vol.39 No.8
Background and Objectives: The failure of ST-segment resolution (STR) after primary percutaneous coronary intervention (pPCI) is associated with adverse clinical outcomes. However, the clinical predictors on admission for incomplete STR are poorly known. Subjects and Methods: Patients undergoing pPCI (n=101, 79 males and 22 females, mean age 60.0 years) were divided into complete STR group (≥70%, n=58) and incomplete STR group (<70%, n=43). The groups were compared according to clinical factors including history, electrocardiographic (ECG) patterns, angiographic features and laboratory data. Results: The incomplete STR group contained more frequent hypertensive patients (p=0.04) and patients displaying longer tendency in total chest pain duration (p=0.08). This group was associated with worse clinical factors such as low ejection fraction (p=0.06), higher Killip class (p=0.08) and more death (p=0.042). Grade 3 ischemia pattern of ECG and precordial ST elevation (i,e anterior myocardial infarction) at admission were more frequent in the incomplete STR group (p=0.001 and 0.002, respectively). Initial troponin I, creatinin kinase -MB and brain natriuretic peptide levels were higher in the incomplete STR group (p=0.001, 0.002, and 0.043, respectively). Coronary angiography showed that culprit lesions were more frequent in left anterior descending artery than other arteries in the incomplete STR group of patients (p=0.002). Thrombolysis In Myocardial Infarction (TIMI) flow grades 2 or less before PCI was more frequent in the incomplete STR group (p=0.029). However, TIMI flow grade after PCI was not appreciably different between the two groups. Logistic regression analysis demonstrated that TIMI flow grade 2 or less was most powerful predictor for incomplete STR {odds ratio (OR)=12.12, 95% confidence interval (CI) 1.23-119.35, p=0.032}. Other independent predictors were anterior infarction (OR=3.39, CI 1.46-10.57, p=0.007), ischemia grade 3 ECG at admission (OR=3.87, CI 1.31-11.41, p=0.014), and hypertensive patients (OR=3.03, CI 1.13-8.15, p=0.027). Conclusion: Incomplete STR after pPCI is associated with poor prognostic clinical factors. TIMI flow grade 2 or less before pPCI, ST elevation on precordial leads, ischemia grade 3 pattern of initial ECG, and hypertensive patients are independent predictors for incomplete STR in the early stage. Background and Objectives: The failure of ST-segment resolution (STR) after primary percutaneous coronary intervention (pPCI) is associated with adverse clinical outcomes. However, the clinical predictors on admission for incomplete STR are poorly known. Subjects and Methods: Patients undergoing pPCI (n=101, 79 males and 22 females, mean age 60.0 years) were divided into complete STR group (≥70%, n=58) and incomplete STR group (<70%, n=43). The groups were compared according to clinical factors including history, electrocardiographic (ECG) patterns, angiographic features and laboratory data. Results: The incomplete STR group contained more frequent hypertensive patients (p=0.04) and patients displaying longer tendency in total chest pain duration (p=0.08). This group was associated with worse clinical factors such as low ejection fraction (p=0.06), higher Killip class (p=0.08) and more death (p=0.042). Grade 3 ischemia pattern of ECG and precordial ST elevation (i,e anterior myocardial infarction) at admission were more frequent in the incomplete STR group (p=0.001 and 0.002, respectively). Initial troponin I, creatinin kinase -MB and brain natriuretic peptide levels were higher in the incomplete STR group (p=0.001, 0.002, and 0.043, respectively). Coronary angiography showed that culprit lesions were more frequent in left anterior descending artery than other arteries in the incomplete STR group of patients (p=0.002). Thrombolysis In Myocardial Infarction (TIMI) flow grades 2 or less before PCI was more frequent in the incomplete STR group (p=0.029). However, TIMI flow grade after PCI was not appreciably different between the two groups. Logistic regression analysis demonstrated that TIMI flow grade 2 or less was most powerful predictor for incomplete STR {odds ratio (OR)=12.12, 95% confidence interval (CI) 1.23-119.35, p=0.032}. Other independent predictors were anterior infarction (OR=3.39, CI 1.46-10.57, p=0.007), ischemia grade 3 ECG at admission (OR=3.87, CI 1.31-11.41, p=0.014), and hypertensive patients (OR=3.03, CI 1.13-8.15, p=0.027). Conclusion: Incomplete STR after pPCI is associated with poor prognostic clinical factors. TIMI flow grade 2 or less before pPCI, ST elevation on precordial leads, ischemia grade 3 pattern of initial ECG, and hypertensive patients are independent predictors for incomplete STR in the early stage.
박소라,황진용,감용란,감민경,서명기,박성지,최봉령,곽충환 대한심장학회 2006 Korean Circulation Journal Vol.36 No.7
We report here on a case of a 34-year-old man with unruptured aneurysm of the left sinus of Valsalva, and hepresented with acute coronary syndrome due to the putative dynamic compression of both the left main coronaryartery and the left circumflex coronary artery. The cardiac multislice computed tomography scanning andcoronary angiogram revealed the compression of the two coronary arteries by the aneurysm of the left sinus ofValsalva. Aneurysmectomy was performed for surgical repair. After the surgery, the patient stayed asymptomaticduring the 6-months of follow-up. (Korean Circulation J 2006;36:549-552)