Browsing by Author "Hsieh, HC"

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Accuracy of the EasyTouch blood glucose self-monitoring system: a study of 516 cases
(2004-11-01)
Dai, KS
;
Tai, DY
;
Ho, P
;
Chen, CC
;
Peng, WC
Background: Self-monitoring blood glucose device is an important toot for diabetes patients to efficiently control their blood glucose concentrations. We evaluated the accuracy of EasyTouch glucose monitoring system. Methods: Capillary blood glucose concentrations measured using EasyTouch and the reference values obtained from Yellow Springs Instruments (YSI) 2300 STAT were performed in the Department of Laboratory Medicine, Wei-Gong Memorial Hospital. Results were evaluated using (1) linear regression analysis, (2) Clarke Error Grid analysis, (3) percentage of readings within a defined range of deviation from the reference value, (4) bias plots, and (5) coefficients of variation (CVs) calculated from 60 measurements in series. Results: The window of the 516 EasyTouch readings covered a range from 42 to 555 mg/dl. Linear regression analysis yielded a regression slope 0.9972, intercept 1.899 mg/dl, r(2) 0.9571, and Syx 14.89 mg/dl. A Clarke Error Grid analysis showed 100% of the EasyTouch readings in clinically acceptable zones A and B. Of the EasyTouch readings, 98.3%, 91.9%, 78.3% and 46.9% were found within +/-20%, +/-15%, +/-10%, and +/-5%, respectively, of the reference values. Further analysis showed that the percentage of EasyTouch readings within the defined intervals was similar in three glucose ranges (less than or equal to100, 101-200, and greater than or equal to201 mg/dl). The CVs for the four lots of strips (lot 1 to lot 4) ranged from 3.5 to 5.5%, 2.1 to 4.8%, 1.8 to 3.6%, and 3.0 to 5.7%, respectively. Conclusions: EasyTouch provides high accurate and precise glucose readings over a wide range of glucose concentrations. (C) 2004 Elsevier B.V. All rights reserved.
An evaluation of clinical accuracy of the EasyTouch blood uric acid self-monitoring system
(2005-03-01)
Dai, KS
;
Tai, DY
;
Ho, P
;
Chen, CC
;
Peng, WC
Objectives: Self-monitoring blood uric acid device is an important tool for patients to efficiently monitor their blood uric acid concentrations. The objective of the present study was to evaluate the accuracy of EasyTouch uric acid monitoring system. Design and methods: Capillary blood uric acid concentrations measured using EasyTouch and the reference values obtained from COBAS MIRA were performed in the Department of Laboratory Medicine, Wei-Gong Memorial Hospital. Results were evaluated using (1) linear regression analysis, (2) percentage of readings within a defined range of deviation from the reference value, and (3) coefficients of variation (CVs) calculated from 60 measurements in series. Results: The window of the 177 EasyTouch readings covered a wide range from 0.1785 to 0.6367 mmol/L (3-10.7 mg/dL). Linear regression analysis yielded a regression slope of 0.975, an intercept of 0.0118 mmol/L and an R-2 of 0.8966. Of the EasyTouch readings, 64 (36.2%), 61 (34.5%), 34 (19.2%), 9 (5.08%), and 9 (5.08%) were within the intervals of <5%, 5-10%, 10-15%, 15-17%, and >17%, respectively, of the reference values. Further analysis for the performance of each lot of strips showed that both coefficients of correlation and the percentages of readings within the CLIA's criterion (+/-17%), respectively, were in a narrow range from 0.8777 to 0.9541 and from 92.1% to 100%. The CVs for the seven lots of strips (lot I to lot 7) ranged from 2.93% to 6.33%, 3.2% to 5.9%, 3.64% to 7.0%, 2.84% to 7.6%, 2.68% to 5.42%, 3.03% to 6.93%, and 3.18% to 5.17%, respectively. Conclusion: EasyTouch is an acceptable diagnostic device which provides accurate uric acid measurements. (C) 2004 The Canadian Society of Clinical Chemists. All rights reserved.
An ultra low power 2.4GHz CMOS VCO
(2003)
Jou, CF
;
Cheng, KH
;
Hsieh, HC
;
傳播研究所
;
Institute of Communication Studies
A low power voltage-controlled oscillator (VCO) for IEEE 802.11b direct conversion receiver is demonstrated. The VCO is fabricated by TSMC 0.25-mum; based on the measurement results, the tuning range is 187MHz (7.78%); phase noise is -73.62dBc/Hz@600kHz offset and -82.44dBc/Hz@1MHz offset at 2.4GHz. The circuit draws only 53 muA current for the VCO core from a 1.5V supply.
Emission current influence of gated structure and diamond emitter morphologies in triode-type field emission arrays
(2000-04-01)
Chen, CF
;
Hsieh, HC
;
材料科學與工程學系
;
Department of Materials Science and Engineering
Field emission display is evolving as a promising technique for the future generation of flat panel displays. Characteristics affecting the power of field emitter arrays include the shape and work function of emission materials, distance between tip and gate, and the environmental vacuum condition. In this work, we present a novel scheme that involves a new fabrication process of gate structure metal-insulator-semiconductor (MIS) diode using IC technology. Deposition of the diamond film in this MIS diode forms a column-like diamond with gated field emission arrays (FEAs). This process is completed using a bias-assisted microwave plasma chemical vapor deposition system. Our results indicate that the threshold voltage of column-like diamond FEAs is about 10 V, and the field emission current density is about 139 mA cm(-2) (at V-gc = 20 V). The diamond field emitter array devices with the new gate structure and tip morphology significantly influence the electron field emission characteristics. (C) 2000 Elsevier Science S.A. All rights reserved.
Fabrication and characterization of the conic diamond field emission arrays with gated structure
(2000-04-01)
Chen, CF
;
Wang, HC
;
Hsieh, HC
;
材料科學與工程學系
;
Department of Materials Science and Engineering
In this study, we successfully fabricate conic diamond field emitter array devices by applying an IC process capable of forming a metal-insulator-semiconductor (MIS) diode structure. The conic diamonds are selectively deposited and, ultimately, grow inside of the electric gates. In addition, the field emission current is measured when applying +1000V voltage on the anode in which the applied gate voltage is varied from 0 to 50 volts. Experimental results indicate that the threshold voltage of this device is about 12 V, and the field emission current is about 40 mu A when the gate voltage is 30 V. Furthermore, current-voltage (I-V) characterization of the electrical properties demonstrates that the reason fur the change of the threshold voltage of conic diamond held emission arrays (FEAs) fabricated under different CH4 concentration may be attributed to the diamond tip radius.