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Rate Control for UWB Mobile Radios
Reali, Gianluca The Korea Institute of Information and Commucation 2004 Journal of communications and networks Vol.6 No.2
This paper shows a technique for regulating the rate emitted by UWB mobile terminals. This technique is designed to adapt the emission rate to the effects of channel capacity variations. We assume that individual flows are shaped at edge routers by means of dual leaky buckets. The proposal is based on the evaluation of certain parameters, which reflect the channel status, sent to the application layer. This information is generated by the scheduler designed to guarantee appropriate channel sharing for the various traffic components. We describe some results which highlight how performance depends on the specific operating conditions, as well as on the traffic descriptors of the flows, their reciprocal difference, and performance requirements.
Juliana de Freitas Leite,Guilherme Antonio Rago Lobo,Paulo Martin Nowak,Irene Reali Antunes,Edward Araujo Júnior,David Baptista da Silva Pares 대한산부인과학회 2019 Obstetrics & Gynecology Science Vol.62 No.6
ObjectiveTo evaluate the performance of the preeclampsia (PE) screening algorithm of the Fetal Medicine Foundation (FMF)during the first trimester in a Brazilian population using maternal characteristics, mean arterial pressure (MAP), anduterine artery Doppler data. MethodsThis is a prospective cohort study that evaluated 701 pregnant women during the first trimester ultrasound screeningfor chromosomal abnormalities (11–13+6 weeks). All patients provided information regarding clinical and obstetrichistory, MAP, and mean uterine artery pulsatility index (mean PI). Patients were assigned to four groups based on thepresence of PE and gestational age at delivery: group 1 (control), patients without hypertensive disorders (n=571);group 2, PE and delivery before 34 weeks of gestation (n=7); group 3, PE and delivery before 37 weeks of gestation,including patients from group 2 and patients that presented PE with delivery between 34 and 37 weeks (n=17); andgroup 4, PE and delivery before 42 weeks of gestation, including patients from both groups 2 and 3 and patients thatpresented PE with delivery between 37 and 42 weeks of gestation (n=34). ResultsAfter the exclusion of 96 patients, we evaluated the data of 605 patients. By combining maternal characteristics, MAP,and the mean uterine artery PI for the detection of PE, we found a sensitivity of 71.4% in group 2, 50% in group 3,and 41.2% in group 4 (false positive rate=10%). ConclusionUsing maternal characteristics, MAP, and uterine artery Doppler data, we were able to identify a significantproportion of patients who developed preterm PE.
Agnesi, A.,Greborio, A.,Pirzio, F.,Ugolotti, E.,Reali, G.,Sun Young Choi,Rotermund, F.,Griebner, U.,Petrov, V. IEEE 2012 IEEE journal on selected topics in quantum electro Vol.18 No.1
<P>In this paper, single-mode 200-mW laser diodes have been demonstrated to be very effective pump devices for low-power Nd:glass lasers, yielding the remarkable continuous wave (cw) slope efficiency of 46.5% for silicate and 58.2% for phosphate glasses, respectively. Femtosecond operation has been investigated with both semiconductor saturable absorber mirrors (SESAMs) and a single-walled carbon nanotube SAM (SWCNT-SAM). Furthermore, a detailed comparison of the mode-locking performance with Nd:phosphate and Nd:silicate, employing either one of the SA devices is presented. Although not fully optimized for this particular application yet, SWCNT-SAs yielded sub-100-fs pulses for the first time in Nd:glass. With SESAM mode locking and a single-prism resonator for dispersion compensation, pulse duration as short as 92 fs has been measured, whereas shorter pulses down to 80 fs have been obtained with a two-prism resonator. Tuning range as broad as 30 nm and output power up to 55 mW have also been achieved, confirming the effectiveness of the proposed laser architecture.</P>
Sub-100-fs Cr:YAG laser mode-locked by monolayer graphene saturable absorber.
Davide Di Dio Cafiso, Samuele,Ugolotti, Elena,Schmidt, Andreas,Petrov, Valentin,Griebner, Uwe,Agnesi, Antonio,Cho, Won Bae,Jung, Bo Hee,Rotermund, Fabian,Bae, Sukang,Hong, Byung Hee,Reali, Giancarlo,P Optical Society of America 2013 Optics letters Vol.38 No.10
<P>We report on mode-locking of a Cr:YAG laser at 1516 nm using a monolayer graphene-based saturable absorber of transmission type generating 91 fs pulses with a Fourier product of 0.38 at an average output power exceeding 100 mW. Stable single-pulse mode-locked operation without any sign of Q-switching instabilities or multiple pulses is achieved.</P>