The Experts below are selected from a list of 287514 Experts worldwide ranked by ideXlab platform
Deogkyoon Jeong - One of the best experts on this subject based on the ideXlab platform.
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multi gigabit rate clock and data recovery based on blind oversampling
IEEE Communications Magazine, 2003Co-Authors: Deogkyoon JeongAbstract:This article addresses issues with designing a blind oversampling clock and data recovery unit (CDR) that meets jitter tolerance specifications. Asymptotic limits on jitter tolerance are derived assuming ideal Phase Detection based on a priori statistics of the received signal, proving that the coarse timing resolution of blind oversampling CDR relies on a Phase Detection algorithm that makes good estimates of the signal's statistics with a finite number of discrete samples and at reasonable hardware costs. The statistical simulation methodology outlined here enables quick verification of the bit error rate and comparisons between the jitter tolerances of various blind oversampling CDR architectures.
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a 0 6 2 5 gbaud cmos tracked 3 spl times oversampling transceiver with dead zone Phase Detection for robust clock data recovery
International Solid-State Circuits Conference, 2001Co-Authors: Yongsam Moon, Deogkyoon JeongAbstract:For generation of the multiPhase clocks for a serializer, a wide-range multiPhase delay-locked loop (DLL) is used in the transmitter to avoid the detrimental characteristics of a Phase-locked loop (PLL), such as jitter peaking and accumulated Phase error. A tracked 3 /spl times/ oversampling technique with dead-zone Phase Detection is incorporated in the receiver for robust clock/data recovery in the presence of excessive jitter and intersymbol interference (ISI). Due to the dead-zone Phase Detection, Phase adjustment is performed only on the tail portions of the transition histogram in the received data eye, thereby exhibiting wide pumping-current range, large jitter tolerance, and small Phase error. A voltage-controlled oscillator (VCO), based on a folded starved inverter, shows about 50% less jitter than one with replica bias. The transceiver, implemented in 0.25-/spl mu/m CMOS technology, operates at 2.5 GBaud over a 10-m 150-/spl Omega/ STP cable and at 1.25 GBaud over a 25-m cable with a bit error rate (BER) of less than 10/sup -13/.
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a 0 6 2 5 gbaud cmos tracked 3 spl times oversampling transceiver with dead zone Phase Detection for robust clock data recovery
International Solid-State Circuits Conference, 2001Co-Authors: Yongsam Moon, Deogkyoon Jeong, Gijung AhnAbstract:For generation of the multiPhase clocks for a serializer, a wide-range multiPhase delay-locked loop (DLL) is used in the transmitter to avoid the detrimental characteristics of a Phase-locked loop (PLL), such as jitter peaking and accumulated Phase error. A tracked 3 /spl times/ oversampling technique with dead-zone Phase Detection is incorporated in the receiver for robust clock/data recovery in the presence of excessive jitter and intersymbol interference (ISI). Due to the dead-zone Phase Detection, Phase adjustment is performed only on the tail portions of the transition histogram in the received data eye, thereby exhibiting wide pumping-current range, large jitter tolerance, and small Phase error. A voltage-controlled oscillator (VCO), based on a folded starved inverter, shows about 50% less jitter than one with replica bias. The transceiver, implemented in 0.25-/spl mu/m CMOS technology, operates at 2.5 GBaud over a 10-m 150-/spl Omega/ STP cable and at 1.25 GBaud over a 25-m cable with a bit error rate (BER) of less than 10/sup -13/.
Hubert Chanson - One of the best experts on this subject based on the ideXlab platform.
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characterisation of transverse turbulent motion in quasi two dimensional aerated flow application of four point air water flow measurements in hydraulic jump
Experimental Thermal and Fluid Science, 2019Co-Authors: Hang Wang, Hubert ChansonAbstract:The measurement of turbulent velocity in highly aerated flow is difficult because of the presence of air bubbles. The characterisation of three-dimensional velocity field in highly aerated flows is even more challenging using existing Phase-Detection techniques. This paper presents an attempt on a quantification of transverse velocity and velocity fluctuations in quasi-two-dimensional hydraulic jumps with relatively high Froude and Reynolds numbers. A four-sensor Phase-Detection probe array was developed to measure the bubble convection in both streamwise and spanwise directions. A characteristic instantaneous transverse velocity component was derived together with a measure of its fluctuations. The transverse velocity component characterised the three-dimensional turbulent structures, although the time-averaged flow pattern was two-dimensional and the average transverse velocity was zero. Both the transverse velocity and velocity fluctuations were smaller than the longitudinal time-averaged velocity and velocity fluctuations in the shear flow, and were quantitatively comparable to those in the free-surface region, revealing different turbulent structures in the lower and upper roller regions. The approximate of Reynolds stresses was discussed together with the limitation of the method. The present work also provided some guidelines for the use of Phase-Detection probe array and correlation signal processing techniques in complex turbulent two-Phase flows.
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Phase Detection probe measurements in high velocity free surface flows including a discussion of key sampling parameters
Experimental Thermal and Fluid Science, 2015Co-Authors: Stefan Felder, Hubert ChansonAbstract:Air-water high-velocity flows are characterised by strong interactions of air bubbles and water droplets. The void fraction ranges from a few percent in bubbly flows to up to 100% at the free-surface and a reliable measurement instrumentation is the Phase-Detection intrusive probe. Herein new experiments were conducted on a stepped spillway (0 = 26.6 degrees) in transition and skimming flow sub-regimes yielding new insights into the turbulent air-water flow properties including the turbulence intensities and integral turbulent time and length scales. The integral turbulent scales showed self-similarity independently of the flow regime. A sensitivity analysis was conducted on the Phase-Detection probe signals to investigate the optimum sampling duration and frequency as well as the data analysis parameters threshold, sub-sampling duration, histogram bin sizes and cut-off effects. The results provide recommendations in terms of optimum sampling and processing parameters for high-velocity air-water flows. (C) 2014 Elsevier Inc. All rights reserved.
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Air-Water Flow Measurements with Intrusive, Phase-Detection Probes: Can We Improve Their Interpretation?
Journal of Hydraulic Engineering, 2002Co-Authors: Hubert ChansonAbstract:Interest in air-water flows has not diminished in recent years, as evident by the number of associated papers published in the Journal of Hydraulic Engineering and other journals, such as the Journal of Hydraulic Research, the International Journal of MultiPhase Flow and the Journal of Fluids Engineering. The writer believes that a particularly important issue is the often inadequate or incomplete interpretation of air-water flow instrumentation by hydraulic engineers and researchers. The present Forum article briefly comments of the several common techniques for measuring air-water flows by means of intrusive Phase Detection probes, and it describes a basic data processing method that readily yields expanded information on air-water flow properties.
Sujit K Ghosh - One of the best experts on this subject based on the ideXlab platform.
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selective and sensitive aqueous Phase Detection of 2 4 6 trinitrophenol tnp by an amine functionalized metal organic framework
Chemistry: A European Journal, 2015Co-Authors: Biplab Joarder, Aamod V Desai, Partha Samanta, Soumya Mukherjee, Sujit K GhoshAbstract:Highly selective and sensitive aqueous-Phase Detection of nitro explosive 2,4,6-trinitrophenol (TNP) by a hydrolytically stable 3D luminescent metal-organic framework is reported. The compound senses TNP exclusively even in the presence of other nitro-compounds, with an unprecedented sensitivity in the MOF regime by means of strategic deployment of its free amine groups. Such an accurate sensing of TNP, widely recognized as a harmful environmental contaminant in water media, establishes this new strategic approach as one of the frontiers to tackle present-day security and health concerns in a real-time scenario.
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selective and sensitive aqueous Phase Detection of 2 4 6 trinitrophenol tnp by an amine functionalized metal organic framework
Chemistry: A European Journal, 2015Co-Authors: Biplab Joarder, Aamod V Desai, Partha Samanta, Soumya Mukherjee, Sujit K GhoshAbstract:Highly selective and sensitive aqueous-Phase Detection of nitro explosive 2,4,6-trinitrophenol (TNP) by a hydrolytically stable 3D luminescent metal-organic framework is reported. The compound senses TNP exclu- sively even in the presence of other nitro-compounds, with an unprecedented sensitivity in the MOF regime by means of strategic deployment of its free amine groups. Such an accurate sensing of TNP, widely recognized as a harmful environmental contaminant in water media, es- tablishes this new strategic approach as one of the fron- tiers to tackle present-day security and health concerns in a real-time scenario. The reliable and accurate Detection of explosives has become a major concern in the perspective of rapidly growing explo- sive deployments in international terrorist attacks. (1) The ingre- dients used in most of the industrial explosives are based on nitroaromatics, nitroaliphatics, and organic peroxide com- pounds, such as 2,4,6-trinitrotoluene (TNT), 2,4-dinitrotoluene
Stefan Felder - One of the best experts on this subject based on the ideXlab platform.
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high velocity air water flows downstream of sluice gates including selection of optimum Phase Detection probe
International Journal of Multiphase Flow, 2019Co-Authors: Stefan Felder, Benjamin Hohermuth, Robert M BoesAbstract:Abstract High-velocity air-water flows occur commonly in hydraulic structures including low-level outlets. Novel experiments of air-water flow patterns and properties were conducted along a tunnel chute downstream of a high-head sluice gate for a wide range of flow conditions including Froude numbers between 10 and 45, Reynolds numbers up to 2.4 × 106 and flow velocities up to 22 m/s, limiting potential scale effects at close to prototype scale. The study documents the evolution of distribution shapes and characteristic values for a range of air-water flow properties along the tunnel chute. The results show an increase in flow aeration and bubble break-up processes with increasing upstream head and flow velocity. The measurement of air-water flow properties was conducted with a side-by-side double-tip conductivity probe, amongst others, which in a comprehensive comparative analysis of four types of Phase-Detection intrusive probe designs was identified as the most suitable one in high-velocity air-water flows as studied herein. The performance of the conductivity probe for the present flow conditions suggests that the probe may be a promising instrumentation for future prototype measurements of high-velocity air-water flows.
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Phase Detection probe measurements in high velocity free surface flows including a discussion of key sampling parameters
Experimental Thermal and Fluid Science, 2015Co-Authors: Stefan Felder, Hubert ChansonAbstract:Air-water high-velocity flows are characterised by strong interactions of air bubbles and water droplets. The void fraction ranges from a few percent in bubbly flows to up to 100% at the free-surface and a reliable measurement instrumentation is the Phase-Detection intrusive probe. Herein new experiments were conducted on a stepped spillway (0 = 26.6 degrees) in transition and skimming flow sub-regimes yielding new insights into the turbulent air-water flow properties including the turbulence intensities and integral turbulent time and length scales. The integral turbulent scales showed self-similarity independently of the flow regime. A sensitivity analysis was conducted on the Phase-Detection probe signals to investigate the optimum sampling duration and frequency as well as the data analysis parameters threshold, sub-sampling duration, histogram bin sizes and cut-off effects. The results provide recommendations in terms of optimum sampling and processing parameters for high-velocity air-water flows. (C) 2014 Elsevier Inc. All rights reserved.
Robert M Boes - One of the best experts on this subject based on the ideXlab platform.
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high velocity air water flows downstream of sluice gates including selection of optimum Phase Detection probe
International Journal of Multiphase Flow, 2019Co-Authors: Stefan Felder, Benjamin Hohermuth, Robert M BoesAbstract:Abstract High-velocity air-water flows occur commonly in hydraulic structures including low-level outlets. Novel experiments of air-water flow patterns and properties were conducted along a tunnel chute downstream of a high-head sluice gate for a wide range of flow conditions including Froude numbers between 10 and 45, Reynolds numbers up to 2.4 × 106 and flow velocities up to 22 m/s, limiting potential scale effects at close to prototype scale. The study documents the evolution of distribution shapes and characteristic values for a range of air-water flow properties along the tunnel chute. The results show an increase in flow aeration and bubble break-up processes with increasing upstream head and flow velocity. The measurement of air-water flow properties was conducted with a side-by-side double-tip conductivity probe, amongst others, which in a comprehensive comparative analysis of four types of Phase-Detection intrusive probe designs was identified as the most suitable one in high-velocity air-water flows as studied herein. The performance of the conductivity probe for the present flow conditions suggests that the probe may be a promising instrumentation for future prototype measurements of high-velocity air-water flows.