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Power Integrity Analysis of Multilayer Printed Circuit Board
Moonjung Kim,Yun-Chan Nam 중소기업융합학회 2015 중소기업융합학회 국제학술대회논문집 Vol.2 No.1
Electrical characteristics and power integrity analysis of a multilayer printed circuit board for application of digital signal processing are investigated in this work. The power integrity of the board is analyzed by calculating the correlation among the characteristics of resonance, impedance and power-ground noise. The resonance cavity analysis between the power plane and the ground plane is performed and provides an intuitive three-dimensional look at voltage differences between planes. These resonances cause a sharp increase in the powerground impedance and then exasperate the signal transmission in the board. Therefore, the powerground impedance is investigated to check an abrupt change at the resonance weak points of the board. The power supply noise that occurs when the noise current is injected is calculated in this work.
The Safety and Efficacy of Transconjunctival Sutureless 23-gauge Vitrectomy
( Moon Jung Kim ),( Kyu Hyung Park ),( Jeong Min Hwang ),( Hyung Gon Yu ),( Young Suk Yu ),( Hum Chung ) 대한안과학회 2007 Korean Journal of Ophthalmology Vol.21 No.4
Purpose: To evaluate the efficacy and safety of vitreoretinal surgery using a 23-gauge transconjunctival sutureless vitrectomy (TSV) system for various vitreoretinal diseases. Methods: A retrospective, consecutive, interventional case series was performed for 40 eyes of 40 patients. The patients underwent vitreoretinal procedures using the 23-gauge TSV system, including idiopathic epiretinal membrane (n=7), vitreous hemorrhage (n=11), diabetic macular edema (n=10), macular hole (n=5), vitreomacular traction syndrome (n=5), diabetic tractional retinal detachment (n=1), and rhegmatogenous retinal detachment (n=1). Best corrected visual acuity (BCVA), intraocular pressure (IOP), and intra- and post-operative complications were evaluated. Results: Intraoperative suture placement was necessary in 3 eyes (7.5%). The median BCVA improved from 20/400 (LogMAR, 1.21±0.63) to 20/140 (LogMAR, 0.83±0.48) at 1 week (p=0.003), 20/100 (LogMAR, 0.85±0.65) at 1 month (p=0.002), 20/100 (LogMAR, 0.73±0.6) at 3 months (p=0.001). In 1 eye, IOP was 5 mmHg at 2 hours and 4 mmHg at 5 hours, but none of the eyes showed hypotony after 1 postoperative day. No serous postoperative complications were observed during a mean follow-up of 8.4±3.4 months (range 3-13 months) Conclusions: The 23-gauge TSV system shows promise as an effective and safe technique for a variety of vitreoretinal procedures. It appears to be a less traumatic, more convenient alternative to 20-gauge vitrectomy in some indications.