http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
A 9–11-Bit Phase-Interpolating Digital Pulsewidth Modulator With 1000x Frequency Range
Yoontaek Lee,Taewook Kang,Jaeha Kim IEEE 2015 IEEE transactions on industry applications Vol.51 No.4
<P>A design of a new hybrid-type digital pulsewidth modulator (DPWM) with a wide frequency range of 1000:1, from 10 kHz to 10 MHz, is presented. The proposed DPWM has the maximum duty-cycle resolution of 11 bits and consumes the power of 17.5 μW at 10 kHz and 2.36 mW at 10 MHz, respectively. The proposed DPWM realizes the upper 5-bit resolution using a programmable digital counter and the lower 6-bit resolution using a current-integrating-type phase interpolator, employing an M2M-ladder current-steering digital-to-analog converter for low power consumption. The operating clock is generated in on-chip using a relaxation oscillator. The prototype integrated circuit fabricated in a 0.25-μm high-voltage complementary metal-oxide-semiconductor demonstrates that the proposed DPWM maintains a good linearity across the entire operating range.</P>
GaN FET-based Synchronous Buck Converter with 10-bit 4-MHz Digital Pulse Width Modulator
Yoontaek Lee,Juyun Lee,Jaeha Kim 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
Architecture of the gallium nitride (GaN) FETbased synchronous buck converter with 10-bit, 4-MHz digital pulse width modulator (DPWM) is presented. The DPWM integrated in proposed architecture has a high resolution and a high operating frequency. In addition, the proposed architecture can control its duty-cycle and deadtime of PWM outputs detail by this DPWM. The testing board, which is manufactured by discrete devices and a custom IC, demonstrates 26.9-W with 91.3% efficiency of the power stage at 4-MHz switching frequency. Experimental results also show the wide duty-range operation controlled by the DPWM.
Five Year Nutritional Outcomes of Patients with Gastric Cancer After Curative Gastrectomy
( Yoontaek Lee ),( Ki Hyung Kim ),( Young Suk Park ),( Sang-hoon Ahn ),( Do Joong Park ),( Hyung-ho Kim ) 한국정맥경장영양학회 2016 한국정맥경장영양학회 학술대회집 Vol.2016 No.-
Background: The long-term nutritional outcomes of patients with gastric cancer after curative gastrectomy are poorly understood. This retrospective cohort study examined the nutritional outcomes of these patients for 5 years after surgery. Methods: All consecutive patients who underwent radical gastrectomy with curative intent for gastric cancer in 2008-2009 and lacked recurrence were included. All were followed up for 5 years. Body weight, serum hemoglobin, total lymphocyte count, and serum albumin levels were collected. Prognostic Nutritional Index (PNI) and Nutritional Risk Index (NRI) were calculated on the basis of these variables. Malnourishment was defined as NRI <97.5. Anemia was defined as <12 and <13 g/dL for women and men, respectively. Results: The mean age of the 658 patients was 58.3 years. The male:female ratio was 1.8:1. Distal and total gastrectomy were performed in 569 (86.5%) and 89 (13.5%) patients, respectively, and 118 (17.9%) and 540 (82.1%) patients did and did not undergo adjuvant chemotherapy, respectively. Compared with the distal gastrectomy and no-chemotherapy groups, the total gastrectomy and chemotherapy groups had lower NRI values and malnutrition rates for 5 and 1 years after surgery (P<0.05), respectively. They also had anemia significantly more frequently 5 and 1 years after surgery (P<0.05), respectively. PNI did not associate with gastrectomy type or chemotherapy. Conclusions: Patients undergoing total gastrectomy or adjuvant chemotherapy after surgery should be closely monitored and appropriately treated for both malnutrition and anemia for 5 and 1 years after surgery, respectively.