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DDI에 사용가능한 높은 슬루율의 전류 부스팅 회로를 갖는 CMOS 증폭기 설계에 관한 연구
김성호,김요섭,손상희 청주대학교 산업과학연구소 2017 産業科學硏究 Vol.35 No.1
In this paper, we designed an AB-class rail-to-rail differential OP-AMP with the desired slew rate and low power consumption while maintaining minimum specifications of other parameters. To realize the above mentioned it, we propose a new concept that uses a current boosting circuit at the bias stage and a voltage comparator circuit at the output stage that can increase the gate voltage. The amplifier with high slew rate and fast driving speed without increasing the power consumption is designed and tried to demonstrate its performance through computer simulation. Simulation results show that the proposed circuit has a high slew rate of 18.3 V/us while the conventional circuit has a low slew rate of 2 V/us.
원광 뇌졸중 등록 자료를 통한 허혈성 뇌졸중의 임상 양상과 위험인자
박현영,장혁,박성욱,김요식,조광호 圓光大學校 醫科學硏究所 1999 圓光醫科學 Vol.15 No.2
Background: To investigate clinical features and risk factors of stroke patients who lived in Korean rural area, we analysis Wonkwang Stroke Registry and compared with other studies. Methods: We filled out Stroke Registry in the consecutive patients with acute ischemic stroke from march 1997 to February 1999. We analyzed demographic data, risk factors and subtypes of stroke. All patients were divied into 3 groups according to their age. Stroke subtype was classified into large artery atherosclerosis(LAA),small vessel occlusion(SVO), cardioembolism(CE), stroke of other determined etiology(SOE), and stroke of undetermined etiology(SUE) by TOAST(Trial of Org 10172 in Actue Stroke Treatment). Results: Five hundred nine patients were included in Wonkwang Stroke Registry from march 1997 to February 1999. Mean age was 65.47±0.48 years old. The ratio of males to females was 1 : 0.78. SVO was the most frequent subtype(49%) of ischemic stroke, and then followed by LAA(27.5%), CE(7%), SOE(8.1%), and SUE(8.4%). The internal carotid artery(ICA) territory was involved in 59.3% patients. Vertebrobasilar artery territory involvement was noted in 37.5%, and 3.2% of patients showed multiple artery territory involvement. All patients had risk factor of ischemic stroke except for 14 patients. Mean number of risk factors was 1.7/patient. Hypertension(62.1%) was the most frequent risk factor, and follwed by smoking(26.3%), diabetes mellitus(25.9%), and hyperlipidemia(25.55%). Conclusions: These results showed that the proportion of ischemic stroke subtype was not concordant with other studies. It may be caused by different mode of living and ethnic difference. This study may afford further information on the characteristics of Korean rural area stroke.
Yo-Seok Cho,Hyuk-Joon Lee,Shin-Hoo Park,Tae-Han Kim,Hwi Nyeong Choe,Yun-Suhk Suh,Seong-Ho Kong,Han-Kwang Yang 대한종양외과학회 2017 Korean Journal of Clinical Oncology Vol.13 No.2
Purpose: This study evaluated the adequacies of lymph node (LN) dissection according to the second version (determined by tumor location) or third/fourth version (determined by surgery extent) of the Japanese gastric cancer treatment guidelines. Methods: Prospectively collected data of 3,948 gastric cancer patients who underwent gastrectomy were analyzed. The prevalence of LN metastasis and 5-year survival were analyzed according to tumor invasion depth and tumor location. In early gastric cancer (EGC), the frequency of LNs were evaluated. In advanced gastric cancer (AGC), the frequency of LN metastasis and the 5-year survival rate of patients with positive LN were evaluated. Results: For lower-third EGC, the positive rates for the #1 and #4sb were 0.93% and 0%. For upper-third EGC, the positive rates for #4d, #5, #6, and #11p were 0.3%, 0%, 0.76%, and 1.22%. For lower-third AGC, the positive rates for #4sb and #14v were 2.48% and 7.64%, and the 5-year survival rates were 69.2% and 12.5%, respectively. For upper-third AGC, the positive rates for #5, #6, and #12a were 2.33%, 2.57%, and 2.03%, and the 5-year survival rates were 21.8%, 64.3%, and 0%, respectively. Conclusion: According to our analysis, in EGC, LN dissection in second edition seems more suitable, however LN dissection in #11p would be mandatory in upper third EGC. In AGC, LN dissection in third/fourth edition seems more suitable in terms of frequency of LN metastasis and survival rate.