| 451. |
- Yang, Geng, et al.
(författare)
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An Active-Cable Connected ECG Monitoring System for Ubiquitous Healthcare
- 2008
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Ingår i: THIRD 2008 INTERNATIONAL CONFERENCE ON CONVERGENCE AND HYBRID INFORMATION TECHNOLOGY, VOL 1, PROCEEDINGS. - : IEEE Press. - 9780769534077 ; , s. 392-397
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Konferensbidrag (refereegranskat)abstract
- In this paper, novel microchip architecture for a "smart electronic electrode" has been proposed Furthermore, a new concept for wearable electrocardiography (ECG) monitoring system especially designed for ubiquitous healthcare is described. The patient can wear single Active-Cable connected smart electronic electrodes with wireless transmission of ECG signals to a dedicated Personal Health Assistant (PHA). The system will act as a continuous ECG data and event recorder, which can be used to follow up patients who have survived cardiac arrest or ventricular tachycardia but also for diagnostic purposes for patients with chronic diseases. A microchip prototype for the smart electronic electrode is implemented using UMC 0.18um process. The post-layout simulation results show that the smart electronic electrode with ultra low power consumption is quite feasible for a hand-held PHA which uses a battery as energy source.
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| 452. |
- Yang, Geng, et al.
(författare)
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An ASIC Solution for Intelligent Electrodes and Active-cable Used in a Wearable ECG Monitoring System
- 2009
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Ingår i: BIODEVICES 2009 - Proceedings of the 2nd International Conference on Biomedical Electronics and Devices. - 9789898111647 ; , s. 209-213
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Konferensbidrag (refereegranskat)abstract
- This paper describes a digital CMOS Application Specific Integrated Circuit (ASIC) solution with the complete data acquisition and transmission for the use in a wearable electrocardiography (ECG) monitoring system. The main particularity of this system is related to the proposed reconfigurable microchip architecture for an intelligent electrode. The chip area is 2.3 mm(2) in a standard 0.18 mu m CMOS technology. The chip is operating at 24 MHz system clock with 3.3 V power supply for I/O cells and 1.8 V for the core circuit respectively. The estimated dynamic power dissipation is only 857 mu W. The post-layout simulation results show that the microchip embedded inside an intelligent electrode features ultra low power consumption and is quite feasible for a hand-held Personal Health Assistant (PHA) which uses a battery as energy source.
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| 453. |
- Yang, Geng, et al.
(författare)
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Bio-Patch Design and Implementation Based on a Low-Power System-on-Chip and Paper-Based Inkjet Printing Technology
- 2012
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Ingår i: IEEE transactions on information technology in biomedicine. - 1089-7771 .- 1558-0032. ; 16:6, s. 1043-1050
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents the prototype implementation of a Bio-Patch using fully integrated low-power System-on-Chip (SoC) sensor and paper-based inkjet printing technology. The SoC sensor is featured with programmable gain and bandwidth to accommodate a variety of bio-signals. It is fabricated in a 0.18-µm standard CMOS technology, with a total power consumption of 20 µW from a 1.2 V supply. Both the electrodes and interconnections are implemented by printing conductive nano-particle inks on a flexible photo paper substrate using inkjet printing technology. A Bio-Patch prototype is developed by integrating the SoC sensor, a soft battery, printed electrodes and interconnections on a photo paper substrate. The Bio-Patch can work alone or operate along with other patches to establish a wired network for synchronous multiple-channel bio-signals recording. The measurement results show that electrocardiogram and electromyogram are successfully measured in in-vivo tests using the implemented Bio-Patch prototype.
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| 454. |
- Yang, Geng, et al.
(författare)
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Intelligent electrode design for long-term ECG monitoring at home : Prototype design using FPAA and FPGA
- 2009
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Ingår i: 2009 3rd International Conference on Pervasive Computing Technologies for Healthcare - Pervasive Health 2009, PCTHealth 2009.
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Konferensbidrag (refereegranskat)abstract
- A personal medical device supporting continuous biosignals monitoring is presented. The novelty of this paper is to provide an intelligent electrode suitable for long-term ECG monitoring. The proposed intelligent electrode is composed of an ASIC chip and a micro pikes array established on a gauze plaster substrate. By comparing the signal quality, the patient's comfort and convenience, the proposed intelligent electrode could be an alternative to the traditional adhesive electrode. A prototype for the intelligent electrode is built up based on programmable FPAA and FPGA chips.
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| 455. |
- Yang, Hongyu, et al.
(författare)
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Integrated impacts of tree planting and street aspect ratios on CO dispersion and personal exposure in full-scale street canyons
- 2020
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Ingår i: Building and Environment. - : Elsevier. - 0360-1323 .- 1873-684X. ; 169
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Tidskriftsartikel (refereegranskat)abstract
- Validated by experimental data, this paper performs computational fluid dynamics (CFD) simulations to investigate the influence of tree plantings on urban airflow and vehicular CO exposure in two-dimensional (2D) street canyons with various aspect ratios (building height/street width, AR = H/W = 0.5, 1, 3, 5) and ground-level source. The impacts of tree canopy bottom height (Htb = 2 m, 6 m), tree stand density (y-density = 0.33, 0.67, 1) and leaf area density (LAD = 0.5, 1, 2 m2/m3) are considered. Personal intake fraction (P_IF) and its spatial mean value in leeward and windward sides (<P_IF>lee, <P_IF>wind) and for entire streets (street intake fraction, <P_IF>) are adopted to assess overall pollutant exposure. For cases without trees, only one main vortex exists in shallow streets with AR = 0.5-3 and <P_IF> as AR = 3 (5.80 ppm) slightly exceeds AR = 0.5-1 (3.98-3.84 ppm). However, two counter-rotating vortexes appear in deep streets (AR = 5), inducing 1-2 orders smaller pedestrian-level velocity (U/Uref~10−4-10−3) and one-order greater <P_IF> (46.80 ppm) than shallow streets. Trees always weaken wind in streets and raise <P_IF> more in shallower streets by 46.0% as AR = 0.5 (3.98 ppm-5.81 ppm), 26.0-45.9% as AR = 1 (3.84 ppm to 4.84-5.60 ppm), 16.2-50.3% as AR = 3 (5.80 ppm to 6.74-8.72 ppm), but only 8.5-23.4% as AR = 5 (46.80 ppm to 50.78-57.73 ppm). Particularly, as AR = 1, trees raise <P_IF>lee (5.87 ppm) by 27.1-57.2%, while <P_IF>wind (1.80 ppm) only by 0%-23.3%. Higher Htb, smaller y-density or LAD produce less increase of <P_IF>. As AR = 3, vegetation increases <P_IF>lee (8.84 ppm) by 21.2%-66.4% but little affects <P_IF>wind (2.76 ppm). Lower Htb produces smaller <P_IF> differing from AR = 1. As AR = 5, vegetation increases <P_IF>wind (63.97 ppm) by 15.1-36.6% but reduces <P_IF>lee (29.63 ppm) by 5.2-8.5%. Although further investigations are still required for design purpose, this paper provides effective methodologies to quantify how vegetation influences street-scale pollutant exposure.
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| 456. |
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| 457. |
- Yang, Jian, 1960, et al.
(författare)
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A Compact Dual-Polarized 4-Port Eleven Feed with High Sensitivity for Reflectors over 0.35-1.05 GHz
- 2015
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Ingår i: IEEE Transactions on Antennas and Propagation. - 0018-926X .- 1558-2221. ; 63:12, s. 5955-5960
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Tidskriftsartikel (refereegranskat)abstract
- We present significant improvements to the circular Eleven feed technology for a dual-reflector system operating over 0.35-1.05 GHz as a backup for the square kilometer array (SKA) project Band 1. In this work, the number of the feed ports is reduced to 4 from the previous 8 for dual polarization using a novel geometry at the center. The design is carried out by optimizing with a social civilization algorithm. The resulting improvements include a reflection coefficient below -12dB, an aperture efficiency above 70% at the upper end of the band, a maximum cross-polar level under -15dB, and an ohmic loss about 0.05 dB. A prototype based on this design has been manufactured and the design simulations have been verified against measurements. A simulated sensitivity of the dual-reflector receiver system for the SKA project based on the measured data is also presented in this communication.
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| 458. |
- Yang, Jian, 1960, et al.
(författare)
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A Fast Algorithm for Calculating the Radiation Pattern in the Longitudinal Plane of Antennas with Cylindrical Structure by Applying Asymptotic Waveform Evaluation in a Spectrum of Two-dimensional Solutions
- 2004
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Ingår i: IEEE Transactions on Antennas and Propagation. - 0018-926X .- 1558-2221. ; 52:7, s. 1700-1706
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Tidskriftsartikel (refereegranskat)abstract
- When dealing with electromagnetic problems of small three-dimensional (3-D) elements, such as dipole, microstrip patches and slots, in the vicinity of two-dimensional (2-D) structures, it is very efficient to find the radiation characteristics of the 3-D elements by using a spectrum of 2-D solutions (S2DS). Only one 2-D solution in the spectral domain is needed to obtain the radiation pattern in the transverse plane defined by θ = 90°. For the radiation in a longitudinal plane defined by a fixed azimuth angle φ, one 2-D problem has to be solved for each value of the polar angle θ. This paper presents a fast algorithm by which the radiation pattern in the longitudinal plane can be computed more efficiently. The algorithm applies the method of asymptotic waveform evaluation (AWE) in the 2-D spectral domain. For the cases shown in the paper, the algorithm needs only three 2-D solutions to determine the complete radiation pattern in the longitudinal plane. © 2004 IEEE.
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| 459. |
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| 460. |
- Yang, Jian, 1960, et al.
(författare)
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A Fast Calculation of Impedances of Dipoles near Cylindrical Structure by Applying Asymptotic Waveform Evaluation in a Spectrum of 2D Solutions
- 2004
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Ingår i: Microwave and Optical Technology Letters. - : Wiley. - 1098-2760 .- 0895-2477. ; 43:4, s. 314-317
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Tidskriftsartikel (refereegranskat)abstract
- A spectrum of 2D solutions (S2DS) applies the Fourier transform to 3D currents in the uniform direction of a 2D cylindrical structure to arrive into a spectral-domain problem which can be solved by 2D spatial techniques. In order to calculate the near fields that are needed for the calculation of impedance, the inverse Fourier transform must be performed. This usually requires a large number of 2D solutions in the spectral domain. By using the asymptotic waveform evaluation (AWE) method in S2DS, the inverse Fourier transform can be performed very efficiently, with only several 2D solutions in the spectral domain. This paper presents the fast calculation of the impedance of a dipole in the vicinity of a 2D cylindrical structure. The cases presented in this paper show that the calculation is accelerated seven times more than by using the direct S2DS method.
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