@article{Benjaboonyazit2019,

title = {Novel approach to respiratory rate measurement using resonance tube with contradictory thresholding technique},

author = {T Benjaboonyazit and M Sriyudthsak and T Desudchit and K Suanpong},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85075935472&doi=10.4186%2fej.2019.23.6.361&partnerID=40&md5=93e0fd964d6571920ab1700e30c8a529},

doi = {10.4186/ej.2019.23.6.361},

issn = {01258281},

year  = {2019},

date = {2019-01-01},

journal = {Engineering Journal},

volume = {23},

number = {6},

pages = {361-379},

publisher = {Chulalongkorn University, Faculty of Fine and Applied Arts},

abstract = {In this paper, we propose a novel approach to respiratory rate measurement using resonance tube to enhance the performance of microphone inserted and fixed at the end of the tube to catch breath sound signal from the mouth and/or nose. The signal is amplified and passed into envelope detector circuit after which it is compared with a suitable reference voltage in comparator circuit to generate a pulse train of square wave synchronized with the respiratory cycle. A simple algorithm is developed in a small microcontroller to detect rising edges of each consecutive square wave to calculate respiratory rate together with analysis of breathing status. In order to evade noises which will cause errors and artifacts in the measuring system, the reference voltage is creatively designed to intelligently adapt itself to be low during expiration period and high during inspiration and pause period using the concept of resolving contradiction in the theory of inventive problem solving (TRIZ). This makes the developed device simple and low-cost with no need for complicated filtering system. It can detect breath sound as far as 250 cm from the nose and can perform accurately as tested against End Tidal CO2 Capnography device. The result shows that the developed device can estimate precisely from as low as 0 BrPM to as high as 98 BrPM and it can detect shallow breathing as low as 10 mV of breath sound. © 2019, Chulalongkorn University, Faculty of Fine and Applied Arts. All rights reserved.},

note = {cited By 0},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Monchayapisut2019,

title = {Facile fabrication of WO3/MWCNT hybrid materials for gas sensing application},

author = {S Monchayapisut and S Ratchahat and M Sriyudthsak and H Sekiguchi and T Charinpanitkul},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85066068438&doi=10.1016%2fj.apsusc.2019.05.103&partnerID=40&md5=cc02159812f5e35ebf68590b740ab9ef},

doi = {10.1016/j.apsusc.2019.05.103},

issn = {01694332},

year  = {2019},

date = {2019-01-01},

journal = {Applied Surface Science},

volume = {487},

pages = {272-277},

publisher = {Elsevier B.V.},

abstract = {Hybrid materials of tungsten oxide (WO3) and multi-walled carbon nanotubes (MWCNTs) were fabricated by a facile method using acid precipitation route. Ammonium tungstate para-pentahydrate was supplied to a designated amount of MWCNTs to prepare a precipitate of tungsten compound hybridizing with MWCNT surface in prior to calcination with air in a temperature range of 300–600 °C. Morphology, crystalline, functional groups on surface, porosity and thermal stability of synthesized hybrid material were characterized by SEM, XRD, Fourier transform Raman spectroscopy, TGA and BET analyses. It could be confirmed that the prepared WO3/MWCNT hybrid materials possessed very high BET surface area and mesoporous characteristics with good thermal stability which would be beneficial to their application as thick-film sensors. © 2019 Elsevier B.V.},

note = {cited By 3},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Sriyudthsak2018,

title = {Micromorphology of porosity related to electrical resistance of dental luting cements},

author = {M Sriyudthsak and Y Kosaiyakanon and F P Luen and K Wattanasirmkit and V Srimaneepong},

editor = {Wasanapiarnpong Chuankrerkkul Pornprasertsuk Traiphol Sujaridworakun T N R N P Sirisoonthorn S. Jiemsirilers S.},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85046074341&doi=10.4028%2fwww.scientific.net%2fKEM.766.13&partnerID=40&md5=deb4c6fc901904815950a2ed27e9f1de},

doi = {10.4028/www.scientific.net/KEM.766.13},

issn = {10139826},

year  = {2018},

date = {2018-01-01},

journal = {Key Engineering Materials},

volume = {766 KEM},

pages = {13-18},

publisher = {Trans Tech Publications Ltd},

abstract = {The aim was to investigate the relation between micromorphology of porosity and electrical resistance of dental luting cements. Five dental luting cements were evaluated: zinc phosphate, glass ionomer, and three types of resin luting cements. Porosity of the specimen was analyzed by micro-CT and electrical resistance of cement was measured at voltage of 125 V up to 30 days and solubility of each specimen was calculated. It showed that the resin luting cements provided the highest electrical resistance regardless of amount of porosity. Zinc phosphate and glass ionomer had high porosity and the lowest resistance (14 and 3 kΩ, respectively). It was found that the electrical resistance of luting cement was not directly affected by the amount of porosity, but it seems to be related to pore connection. There is no correlation between electrical resistance and percentage of porosity but the morphology of porosity may have an influence on the electrical property of luting cement. Models of pore connection were proposed to explain the electrical resistance of luting cement. © 2018 Trans Tech Publications, Switzerland.},

note = {cited By 0; Conference of 3rd International Conference on Traditional and Advanced Ceramics, ICTA 2017 ; Conference Date: 31 August 2017 Through 1 September 2017; Conference Code:213119},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Ratanaporncharoen2018,

title = {Characterization and optimization of thermally grown iridium oxide and its application to pH sensors},

author = {C Ratanaporncharoen and M Tabata and N Watanagool and T Goda and A Matsumoto and M Sriyudthsak and Y Miyahara},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85048603120&doi=10.18494%2fSAM.2018.1733&partnerID=40&md5=7d127611b24843b03a809b3ef012e937},

doi = {10.18494/SAM.2018.1733},

issn = {09144935},

year  = {2018},

date = {2018-01-01},

journal = {Sensors and Materials},

volume = {30},

number = {5},

pages = {1175-1185},

publisher = {M Y U Scientific Publishing Division},

abstract = {In this study, we evaluate the thermal oxidization methods of iridium to simplify the fabrication of Ir/IrOx pH microsensors. Iridium oxide (IrOx) is a typical pH-sensing material. Specifically, three parameters of the previously reported "carbonate-melt" method are modified, namely, the oxidization temperature, oxidization time, and annealing process after oxidization. Then, we compare the characteristics of the fabricated sensors (i.e., the initial pH responsivity, time required to reach the steady state, and potential drift). The pH response depends on oxidization temperature and time. © MYU K.K.},

note = {cited By 3},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Rodyou2017,

title = {Screening and selection of ferric reducing bacteria by electrical current for microbial fuel cell},

author = {K Rodyou and S Rengpipat and M Sriyudthsak},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85032027891&doi=10.4186%2fej.2017.21.5.25&partnerID=40&md5=9a5773e5fd943edf3e944d1be816ce36},

doi = {10.4186/ej.2017.21.5.25},

issn = {01258281},

year  = {2017},

date = {2017-01-01},

journal = {Engineering Journal},

volume = {21},

number = {5},

pages = {25-35},

publisher = {Chulalongkorn University 1},

abstract = {The efficiency of microbial fuel cell (MFC) performance depends on the competence of microorganisms on being an essential role in primarily converting organic compound into electricity. In this study, the possibility of using electrical current to select electrochemical active bacteria from sub-sediment for use in MFC was conducted. By using an alternating current (AC) of 0.6-12 mA and selective media, 16 Gram-positive ferric reducing bacteria (GP-FRB), 15 Gram-negative ferric reducing bacteria (GN-FRB) and 9 Gram-negative non FRB (GN-nonFRB) were characterized. GN-FRB and GP-FRB were obtained from the current of 0.6-6 and 9-12 mA, respectively. After tested in MFC, GN-FRB had a greater current density and power density than those from GN-nonFRB and GP-FRB. However, the greatest voltage was obtained from GP-FRB, followed by those of GN-nonFRB and GN-FRB, respectively. The highest current and power density of 13.33 mA/m2 and 0.32 mW/m2, respectively were from GN-FRB namely KL14 which was identified later as Proteus sp. This research could contribute a promising method for screening and selection of ferric reducing bacteria using electrical current. MFC inoculated with our selected bacteria could be a model for next study in wastewater treatment. © 2017, Chulalongkorn University 1. All rights reserved.},

note = {cited By 1},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Trirongjitmoah2016,

title = {Practical technique to quantify small, dense low-density lipoprotein cholesterol using dynamic light scattering},

author = {S Trirongjitmoah and K Iinaga and T Sakurai and H Chiba and M Sriyudthsak and K Shimizu},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84957546358&doi=10.1007%2fs10043-016-0187-9&partnerID=40&md5=f9feedcc04b1024d094f5ffd354ad06d},

doi = {10.1007/s10043-016-0187-9},

issn = {13406000},

year  = {2016},

date = {2016-01-01},

journal = {Optical Review},

volume = {23},

number = {2},

pages = {265-272},

publisher = {SpringerOpen},

abstract = {Quantification of small, dense low-density lipoprotein (sdLDL) cholesterol is clinically significant. We propose a practical technique to estimate the amount of sdLDL cholesterol using dynamic light scattering (DLS). An analytical solution in a closed form has newly been obtained to estimate the weight fraction of one species of scatterers in the DLS measurement of two species of scatterers. Using this solution, we can quantify the sdLDL cholesterol amount from the amounts of the low-density lipoprotein cholesterol and the high-density lipoprotein (HDL) cholesterol, which are commonly obtained through clinical tests. The accuracy of the proposed technique was confirmed experimentally using latex spheres with known size distributions. The applicability of the proposed technique was examined using samples of human blood serum. The possibility of estimating the sdLDL amount using the HDL data was demonstrated. These results suggest that the quantitative estimation of sdLDL amounts using DLS is feasible for point-of-care testing in clinical practice. © 2016, The Optical Society of Japan.},

note = {cited By 0},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Ibrahim2016,

title = {Nanowires nickel oxide and nanospherical manganese oxide synthesized via low temperature hydrothermal technique for hydrogen peroxide sensor},

author = {S Ibrahim and T Charinpanitkul and E Kobatake and M Sriyudthsak},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84962088909&doi=10.1155%2f2016%2f9138961&partnerID=40&md5=f59a82252ccfbcea9a14d5592a205a3e},

doi = {10.1155/2016/9138961},

issn = {20909063},

year  = {2016},

date = {2016-01-01},

journal = {Journal of Chemistry},

volume = {2016},

publisher = {Hindawi Publishing Corporation},

abstract = {Binary catalyst nickel oxides (NiO) and manganese oxides (MnO) were prepared individually via hydrothermal route. The catalysts were characterized by scanning electron microscope (SEM), Brunauer-Emmett-Teller (BET) analysis, cyclic voltammetry (CV), and amperometry. Morphology studies revealed physical structure of nanowires nickel oxide and spherical manganese oxide with estimated length of 0.3-2.3 m and diameter of 0.2-0.8 m, respectively. Surface areas obtained for nickel oxide and manganese oxide were 68.9 m2 g-1 and 45.2 m2 g-1, respectively. Cyclic voltammetry exhibits electrochemical responses corresponding to the electrode surfaces. The linear responses of the binary catalyst modified gold electrodes with NiO-MnO were observed in the concentration range from 31.8 M to 0.5 mM with the detection limit of 62.5 M. © 2016 Suriani Ibrahim et al.},

note = {cited By 4},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Buated2012,

title = {A low-cost intervention for improving gait in Parknson's disease patients: A cane providing visual cues},

author = {W Buated and M Sriyudthsak and N Sribunruangrit and R Bhidayasiri},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84859427127&doi=10.1016%2fj.eurger.2012.01.006&partnerID=40&md5=2af58012a03fc03c54075406b0b12f18},

doi = {10.1016/j.eurger.2012.01.006},

issn = {18787649},

year  = {2012},

date = {2012-01-01},

journal = {European Geriatric Medicine},

volume = {3},

number = {2},

pages = {126-130},

abstract = {Objective: Stable walking is problematical for many Parkinson's disease (PD) patients, sometimes experienced as "Freezing of Gait" (FOG), a brief interruption of their natural walking rhythm usually limited to advanced stages of PD. Visual cues have been found to reduce FOG so that patients are able to continue their walking without interruption, thereby reducing falls. This study assessed the difference in the impact on FOG with a group of PD patients receiving visual cues from an innovative "laser cane" and with a traditional cane with no cues. Methods: This study of 30 PD patients compares the impact on FOG of a cane that provided visual cues from a laser beam with a cane providing no cues during both 'on' and 'off' responses to medications. For each test the individual subjects were videotaped walking two rounds on a 5-meter track and their footsteps were printed on paper tracking sheets. Results: The visual cues of the laser beam cane significantly increased both stride length and velocity during the 'off' medication period in all of the participating patients. Greater improvements of the gait parameters were experienced in PD patients with the moderate stage (H & Y = 3) (17 patients) than those in the mild stage (H & Y = 2) (13 patients); with the biggest differences in reduced FOG and increased stride length. Conclusions: This study demonstrates that an effective, low-cost intervention can be designed and implemented in low and middle-income countries for solving the problem of FOG in PD patients using locally available technology. © 2012 Elsevier Masson SAS and European Union Geriatric Medicine Society.},

note = {cited By 4},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Ouitrakul2007,

title = {Impedance analysis of bio-fuel cell electrodes},

author = {S Ouitrakul and M Sriyudthsak and S Charojrochkul and T Kakizono},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-36048955859&doi=10.1016%2fj.bios.2007.08.012&partnerID=40&md5=df5bf67ad807fd6994c8f3ee2450e7d3},

doi = {10.1016/j.bios.2007.08.012},

issn = {09565663},

year  = {2007},

date = {2007-01-01},

journal = {Biosensors and Bioelectronics},

volume = {23},

number = {5},

pages = {721-727},

abstract = {To determine the criteria for the selection of an electrode suitable for a bio-fuel cell (BFC), five electrodes, i.e. silver, aluminum, nickel, stainless steel and carbon fiber cloth were investigated. The performance of the BFC according to the electrode material, including the generated voltage, current density and power density was observed. These results show that the materials used for constructing the electrodes affect the performance of the BFC. An impedance analysis was used to describe the characteristics of the electrodes in the solution. Equivalent circuits of each component such as solution, electrodes-solution interface and electrode were determined from the impedance data. The constant-phase element (CPE) model was applied for data analyzing. It was found that stainless steel, nickel and aluminum behaved like a polarized electrode which has a high electrode-solution interfacial impedance, while carbon fiber cloth and silver had a low impedance like a non-polarized electrode. The impedance data indicated that a higher interfacial impedance will result in a higher loading effect. The results can be summarized that the carbon fiber cloth electrode offers a good electron transfer in the system and thus supplies higher power to the external load. © 2007 Elsevier B.V. All rights reserved.},

note = {cited By 45},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Supothina2007,

title = {Synthesis of tungsten oxide nanoparticles by acid precipitation method},

author = {S Supothina and P Seeharaj and S Yoriya and M Sriyudthsak},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-34250885086&doi=10.1016%2fj.ceramint.2006.02.007&partnerID=40&md5=34dfda4a2e753da1500be3695c6e2e9b},

doi = {10.1016/j.ceramint.2006.02.007},

issn = {02728842},

year  = {2007},

date = {2007-01-01},

journal = {Ceramics International},

volume = {33},

number = {6},

pages = {931-936},

abstract = {Tungsten oxide (WO3) nanoparticle having average size of 30 nm, and nanoplate having average dimension of 190 ± 15 nm wide and 50 ± 5 nm thick were prepared by controlling a precipitation of ammonium tungstate para pentahydrate with nitric acid. The two nanostructured microstructures were obtained by varying the stirring time during the precipitation reaction while the other synthesis parameters were identical. Phase transition of the WO3 precipitate was investigated by means of thermal analysis and X-ray diffraction, while the microstructure was observed by using a scanning electron microscope and a transmission electron microscope. The effect of the concentrations of the tungstate salt and nitric acid on the rate of precipitation and the percent yield of the precipitating product is also described. © 2006 Elsevier Ltd and Techna Group S.r.l.},

note = {cited By 122},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Sriyudthsak2006,

title = {Humidity-insensitive and low oxygen dependence tungsten oxide gas sensors},

author = {M Sriyudthsak and S Supothina},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-29244447085&doi=10.1016%2fj.snb.2005.02.057&partnerID=40&md5=0c66ece19b1df77a73e51f32d6dbb3d9},

doi = {10.1016/j.snb.2005.02.057},

issn = {09254005},

year  = {2006},

date = {2006-01-01},

journal = {Sensors and Actuators, B: Chemical},

volume = {113},

number = {1},

pages = {265-271},

abstract = {Gas sensing characteristics of WO3 powder and its physical properties under different heat treatment conditions have been investigated. The WO3 powder was synthesized by wet process from ammonium tungstate parapentahydrate and nitric solution. The precipitated product was then calcined at 300-800 °C for 2-12 h. The physical properties of the products were characterized by using X-ray diffractometer (XRD), scanning electron microscope (SEM), and BET method. It was found that the crystallite size, particle size and surface area of the WO3 powders were in the range of 30-45 nm, 0.1-3.0 μm and 1.2-3.7 m2/g, respectively. Calcination at higher temperature and longer time led to the increase of particle size by more than 300%, and reduction in specific surface area by more than 60%. However, the crystallite size was found to increase only by ∼30% under identical heat treatment. These results inferred that such heat treatment had more profound effect on crystallite aggregation than on crystallite growth. Gas sensing measurement showed that the largest change of output voltage to both ethyl alcohol and ammonia was obtained from the sensor calcined at 600 °C for 2 h, which had the highest surface area. However, the highest sensitivity which is defined as the ratio of sensor's resistance in air to that in the sample gas, Rair/Rgas, was obtained from the sensor calcined at 600 °C for 6 h due to its highest background resistance in air. Moreover, it was also found that the sensors were less sensitive to the oxygen content in the carrier gas and did not sensitive at all to water vapor. © 2005 Elsevier B.V. All rights reserved.},

note = {cited By 38},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Werawatgoompa2001,

title = {Feasibility study on the detection of ferritin using surface plasmon resonance},

author = {S Werawatgoompa and M Sriyudthsak},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0001323346&partnerID=40&md5=1a0166d2bc2971a5bfd1d65eff20db0e},

issn = {01252208},

year  = {2001},

date = {2001-01-01},

journal = {Journal of the Medical Association of Thailand},

volume = {84},

number = {SUPPL. 1},

pages = {S155-S162},

publisher = {Medical Association of Thailand},

abstract = {Determination of ferritin concentration was performed using surface plasmon resonance technique. An anti-human ferritin antiserum from rabbits was immobilized on the protein-A coated sensor chip. The resonance change due to the binding of ferritin to the antibody was measured. It was found that the antigen-antibody binding of the ferritin could be monitored in real time. The detection of ferritin could be obtained in the range of 25-800 ng/ml. This dynamic range could be applied in various medical applications. Moreover, it was observed that the sensor chips could be regenerated. This offers an opportunity for multiple uses, which will reduce the unit operating cost.},

note = {cited By 3},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Teeramongkonrasmee2000,

title = {Methanol and ammonia sensing characteristics of sol-gel derived thin film gas sensor},

author = {A Teeramongkonrasmee and M Sriyudthsak},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0033689372&doi=10.1016%2fS0925-4005%2800%2900346-4&partnerID=40&md5=698dc5a2e8c565376b0601558a13f693},

doi = {10.1016/S0925-4005(00)00346-4},

issn = {09254005},

year  = {2000},

date = {2000-01-01},

journal = {Sensors and Actuators, B: Chemical},

volume = {66},

number = {1},

pages = {256-259},

publisher = {Elsevier Sequoia SA, Lausanne},

address = {Beijing, China},

abstract = {SnO2 thin film gas sensors have been prepared by sol-gel technique. The tin alkoxide precursor was synthesized by chemical reactions involving tin tetrachloride and sodium ethoxide. The gas sensing characteristics have been studied using a flow injection analysis and liquid samples of alcohol and ammonia. The experimental results revealed that the film thickness strongly affected gas sensitivity of the SnO2 films. The SnO2 gas sensors gave linear relationship between logarithm of gas sensitivity and logarithm of sample concentration in the range of 0.26-10% by volume for alcohol and 0.05-10% by volume for ammonia with the operation temperature of 350 °C.},

note = {cited By 106; Conference of IMCS-7: 7th International Meeting on Chemical Sensors ; Conference Date: 27 July 1998 Through 30 July 1998; Conference Code:57106},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Sriyudthsak2000,

title = {Radial basis neural networks for identification of volatile organic compounds},

author = {M Sriyudthsak and A Teeramongkolrasasmee and T Moriizumi},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0034733272&doi=10.1016%2fS0925-4005%2899%2900400-1&partnerID=40&md5=da394a16aea404178d19ff7293175bd4},

doi = {10.1016/S0925-4005(99)00400-1},

issn = {09254005},

year  = {2000},

date = {2000-01-01},

journal = {Sensors and Actuators, B: Chemical},

volume = {65},

number = {1},

pages = {358-360},

publisher = {Elsevier Sequoia SA, Lausanne},

address = {Beijing, China},

abstract = {In this paper, radial basis neural network (RB-NN) was proposed for the identification of volatile organic compounds (VOCs). The measuring system with four 20 MHz quartz crystal microbalances (QCMs) as sensors was used in the experiments. The four sensors were modified with SnCl2 and PdCl2 to change the response characteristics. A flow-through type system was used to measure the VOC samples including ethyl alcohol, acetone, chloroform, and de-ionized water. Rise-time, peak, and fall-time data from the response characteristic curves were used as information for training the neural networks. It was found that the RB-NNs could be learned faster and better than the conventional back-propagation neural networks (BP-NNs). The samples were clearly separated and recognized with the RB-NNs, which could not be done with the BP-NNs.},

note = {cited By 10; Conference of IMCS-7: 7th International Meeting on Chemical Sensors ; Conference Date: 27 July 1998 Through 30 July 1998; Conference Code:57106},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Teeramongkonrasmee1999,

title = {Problems in gas sensor measuring circuit and proposal of new circuit},

author = {A Teeramongkonrasmee and M Sriyudthsak},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0033466555&partnerID=40&md5=44b0e9f776a65f7a11ed2bb6953a4234},

issn = {09144935},

year  = {1999},

date = {1999-01-01},

journal = {Sensors and Materials},

volume = {11},

number = {3},

pages = {149-162},

abstract = {An analysis including the nonlinear characteristic of gas sensors shows that the conventional gas measuring circuit is not suitable for determining gas sensitivity (S = Rair/ Rgas). This circuit exhibits a dependence of sensitivity on the values of external circuit components, i.e., series resistance (R) and voltage source (Vin). Moreover, the dynamic parameters, such as recovery time, are also strongly affected by these external components. These problems prevent the use of the conventional circuit in the comparison of gas sensing performance and gas sensitivity among different sensors. A novel gas measuring circuit is proposed to overcome these problems. In this new circuit, the electrical operating point of the semiconductor gas sensor is kept at a constant value and is not disturbed by the change of the external resistance. The experimental results showed that the new circuit gave a nearly constant sensitivity and faster recovery time.},

note = {cited By 2},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Sriyudthsak1996,

title = {Enzyme-epoxy membrane based glucose analyzing system and medical applications},

author = {M Sriyudthsak and T Cholapranee and M Sawadsaringkarn and N Yupongchaey and P Jaiwang},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0029883063&doi=10.1016%2f0956-5663%2896%2985924-0&partnerID=40&md5=b07ca5a5537cf60e955779e4be48011c},

doi = {10.1016/0956-5663(96)85924-0},

issn = {09565663},

year  = {1996},

date = {1996-01-01},

journal = {Biosensors and Bioelectronics},

volume = {11},

number = {8},

pages = {735-742},

publisher = {Elsevier Science Ltd, Oxford},

address = {Bangkok, Thailand},

abstract = {A semi-automatic glucose analyzing system has been developed. It consists of thin film glucose sensors and a flow injection system with a computerized data processing unit. The sensor is made of titanium and platinum, using the well-established semiconductor process technology. Glucose oxidase is immobilized into the network of epoxy on the electrode surface together with ferrocene, which is used as an electron mediator for reducing the operation voltage of the sensor. The system can measure glucose from 50 to 4000 mg/dl with good linearity up to 400 mg/dl. This can cover the range needed in medical and biotechnological applications. The system can measure samples at a speed of more than 60 samples per hour and has a coefficient of variation of 3%. Selectivity tests were performed and the results showed that there was no interference from sucrose, lactose, maltose, ascorbic acid and uric acid. The sensors were then employed in detecting glucose in human blood plasma samples. The results show good correlation with the results from commercial machines. 

A semi-automatic glucose analyzing system has been developed. It consists of thin film glucose sensors and a flow injection system with a computerized data processing unit. The sensor is made of titanium and platinum, using the well-established semiconductor process technology. Glucose oxidase is immobilized into the network of epoxy on the electrode surface together with ferrocene, which is used as an electron mediator for reducing the operation voltage of the sensor. The system can measure glucose from 50 to 4000 mg/dl with good linearity up to 400 mg/dl. This can cover the range needed in medical and biotechnological applications. The system can measure samples at a speed of more than 60 samples per hour and has a coefficient of variation of 3%. Selectivity tests were performed and the results showed that there was no interference from sucrose, lactose, maltose, ascorbic acid and uric acid. The sensors were then employed in detecting glucose in human blood plasma samples. The results show good correlation with the results from commercial machines.},

note = {cited By 7; Conference of Proceedings of the 1996 4th World Congress on Biosensors ; Conference Date: 29 May 1996 Through 31 May 1996; Conference Code:44812},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Promsong1995,

title = {Thin tin-oxide film alcohol-gas sensor},

author = {L Promsong and M Sriyudthsak},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0029288177&doi=10.1016%2f0925-4005%2895%2985108-9&partnerID=40&md5=3fbea4c414f069e375ecb5eafb836b3d},

doi = {10.1016/0925-4005(95)85108-9},

issn = {09254005},

year  = {1995},

date = {1995-01-01},

journal = {Sensors and Actuators: B. Chemical},

volume = {25},

number = {1-3},

pages = {504-506},

abstract = {Alcohol-gas sensors have been fabricated from thin-film tin oxide. The thickness of the tin-oxide film is 500 Å. The sensor electrode has been formed by evaporating 500 Å of titanium and 1000 Å of platinum on to the tin-oxide film by using an electron-beam evaporator. Calcium oxide and aluminium have been used as dopants for improving the sensor characteristics. It is found that by doping the sensor with 2% calcium oxide, the operating temperature can be reduced from 500°C to 200 or 300°C, and the sensitivity and selectivity of the sensor are enhanced. The sensor has a linear response to alcohol concentration from 1 to 10% by volume. The sensor has been also employed in testing the alcohol concentration in commercial wines. The results obtained from the gas sensor correlate with the value labelled on the wine bottles. © 1995.},

note = {cited By 42},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Sriyudthsak1993,

title = {Effect of carrier gas on response of oxide semiconductor gas sensor},

author = {M Sriyudthsak and L Promsong and S Panyakeow},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0027590801&doi=10.1016%2f0925-4005%2893%2985345-B&partnerID=40&md5=9189408c1d471a09f1b8b93b8ddb07e7},

doi = {10.1016/0925-4005(93)85345-B},

issn = {09254005},

year  = {1993},

date = {1993-01-01},

journal = {Sensors and Actuators: B. Chemical},

volume = {13},

number = {1-3},

pages = {139-142},

abstract = {It is known that response mechanism of an oxide semiconductor gas sensor based on a redox process occurs at the surface of the sensor. The present investigation used an alcohol gas sensor made of tin oxide as an example to demonstrate the role of oxygen molecules in carrier gases on the response of the sensor. It is found that high concentration of oxygen in the carrier gases reduced the sensor recovery time and background conductance, and enhanced its dynamic range and linearity of measurement. These results can be explained by a reaction model of oxidation by oxygen and reduction by reducing gas at the surface of the sensor. © 1993.},

note = {cited By 14},

keywords = {},

pubstate = {published},

tppubtype = {article}

}