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JOURNAL OF SENSOR SCIENCE AND TECHNOLOGY

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수록정보
수록범위 : 1권1호(1992)~27권1호(2018) |수록논문 수 : 1,611
센서학회지
27권1호(2018년) 수록논문
최근 권호 논문
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KCI등재

1Dielectric Properties of Ca0.8Sr1.2Nb3O10 Nanosheet Thin Film Deposited by the Electrophoretic Deposition Method

저자 : ( Haena Yim ) , ( So-yeon Yoo ) , ( Ji-won Choi )

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 1호 발행 연도 : 2018 페이지 : pp. 1-5 (5 pages)

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Two-dimensional (2D) niobate-based nanosheets have attracted attention as high-k dielectric materials. We synthesized strontiumsubstituted calcium niobate (Ca0.8Sr1.2Nb3O10) nanosheets by a two-step cation exchange process from KCa0.8Sr1.2Nb3O10 ceramic. The K+ ions were exchanged with H+ ions, and then H+ ions were exchanged with tetrabutylammonium (TBA+) cations. The Ca0.8Sr1.2Nb3O10 nanosheets were then exfoliated, decreasing the electrostatic interaction between each niobate layer. Furthermore, Ca2Nb3O10 nanosheets were synthesized in same process for comparison. Each exfoliated nanosheet shows a single-crystal phase and has a lateral size of over 100 nm. The nanosheets were deposited on a Pt/Ti/SiO2/Si substrate by the electrophoretic deposition (EPD) method at 40 V, followed by ultraviolet irradiation of the films in order to remove the remaining TBA+ ions. The Ca0.8Sr1.2Nb3O10 thin film exhibited twice the dielectric permittivity (~60) and lower dielectric loss than Ca2Nb3O10 thin films.

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2RGB-LED-based Optical Camera Communication using Multilevel Variable Pulse Position Modulation for Healthcare Applications

저자 : ( Vega Pradana Rachim ) , ( Jinyoung An ) , ( Quan Ngoc Pham ) , ( Wan-young Chu

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 1호 발행 연도 : 2018 페이지 : pp. 6-12 (7 pages)

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In this paper, a 32-variable pulse position modulation (32-VPPM) scheme is proposed to support a red-green-blue light-emitting-diode (RGB-LED)-based optical camera communication (OCC) system. Our proposed modulation scheme is designed to enhance the OCC data transmission rate, which is targeted for the wearable biomedical data monitoring system. The OCC technology has been utilized as an alternative solution to the radio frequency (RF) wireless system for long-term self-healthcare monitoring. Different biomedical signals, such as electrocardiograms, photoplethysmograms, and respiration signals are being monitored and transmitted wirelessly from the wearable biomedical device to the smartphone receiver. A common 30 frames per second (fps) smartphone camera with a CMOS image sensor is used to record a transmitted optical signal. Moreover, the overall proposed system architecture, modulation scheme, and data demodulation are discussed in this paper. The experimental result shows that the proposed system is able to achieve > 9 kbps using only a common smartphone camera receiver.

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3Synthesis of Nanoporous Metal Oxide Films Using Anodic Oxidation and Their Gas Sensing Properties

저자 : ( Jun Min Suh ) , ( Do Hong Kim ) , ( Ho Won Jang )

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 1호 발행 연도 : 2018 페이지 : pp. 13-20 (8 pages)

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Gas sensors based on metal oxide semiconductors are used in numerous applications including monitoring indoor air quality and detecting harmful substances like volatile organic compounds. Nanostructures, for example, nanoparticles, nanotubes, nanodomes, and nanofibers have been widely utilized to improve gas sensing properties of metal oxide semiconductors, and this increases the effective surface area, resulting in participation of more target gas molecules in the surface reaction. In the recent times, 1-dimensional (1D) metal oxide nanostructures fabricated using anodic oxidation have attracted great attention due to their high surface-to-volume ratio with largearea uniformity, reproducibility, and capability of synthesis under ambient air and pressure, leading to cost-effectiveness. Here, we provide a brief overview of 1D metal oxide nanostructures fabricated by anodic oxidation and their gas sensing properties. In addition, recent progress on thin film-based anodic oxidation for application in gas sensors is introduced.

KCI등재

4Switched-Capacitor Based Digital Temperature Sensor Implemented in 0.35-μm CMOS Process

저자 : ( Su-bin Kim ) , ( Jeon-woong Choi ) , ( Tae-gyu Lee ) , ( Ki-ppeum Lee ) , ( Ha

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 1호 발행 연도 : 2018 페이지 : pp. 21-24 (4 pages)

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A temperature sensor with a binary output was implemented using switched-capacitor circuits in a 0.35-μm CMOS(com-plementary metal-oxide semiconductor) process. The measured temperature exhibited good agreement with the oven temperature after calibration. The measured power consumption was 5.61 mW, slightly lower than the simulated power consumption of 6.63 mW.

KCI등재

5평면 광도파로 기반의 소산파 집적광학 바이오센서의 감지도 최적화에 관한 정규화 해석에 관한 연구

저자 : 정홍식 ( Hongsik Jung )

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 1호 발행 연도 : 2018 페이지 : pp. 25-30 (6 pages)

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Closed-form analytical expressions and 3-dimensional normalized charts for the homogeneous sensing and surface sensing structures are derived to provide the conditions for the maximum sensitivity of integrated-optic biosensors based on evanescent-wave and stepindex planar optical waveguides. The analysis is made for transverse electric (TE) polarization mode, in both cases where the measurand is homogeneously distributed in the cover (namely, homogeneous sensing), and where it is an ultrathin film on the waveguide-cover interface (namely, surface sensing)

KCI등재

6신호 대 잡음비가 향상된 센서 신호 측정용 저 전력 SAR형 A/D 변환기

저자 : 정찬경 ( Chan-kyeong Jung ) , 임신일 ( Shin-il Lim )

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 1호 발행 연도 : 2018 페이지 : pp. 31-35 (5 pages)

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This paper describes a low-power, SNDR (signal-to-noise and distortion ration) enhanced SAR (successive approximation register) type 12b ADC (analog-to-digital converter) with noise shaping technique. For low power consumption and small chip size of the DAC (digital-to- analog converter), the top plate sampling technique and the dummy capacitor switching technique are used to implement 12b operation with a 10b capacitor array in DAC. Noise shaping technique is applied to improve the SNDR by reducing the errors from the mismatching of DAC capacitor arrays, the errors caused by attenuation capacitor and the errors from the comparator noise. The proposed SAR ADC is designed with a 0.18 μm CMOS process. The simulation results show that the SNDR of the SAR ADC without the noise shaping technique is 71 dB and that of the SAR ADC with the noise shaping technique is 84 dB. We can achieve the 13 dB improvement in SNDR with this noise shaping technique. The power consumption is 73.8 μW and the FoM (figure-of-merit) is 5.2fJ/ conversion-step.

KCI등재

7투명 박막 리튬이차전지를 위한 LiNiPO4 박막의 광학 및 전기화학적 특성

저자 : 이현석 ( Hyunseok Lee ) , ( Narendra S Parmar ) , 김광범 ( Kwang-bum Kim ) , 최지원 ( Ji-

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 1호 발행 연도 : 2018 페이지 : pp. 36-39 (4 pages)

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Transparent olivine LiNiPO4 thin films on sapphire substrates were fabricated by radio frequency (RF) magnetron sputtering. The Xray diffraction patterns show these thin films have the phase of LiNiPO4 with an ordered olivine structure indexed to the orthorhombic Pmna space group. LiNiPO4 thin films deposited on sapphire substrates exhibit transmittance of about 83 %. It was confirmed that the LiNiPO4 thin film exhibits a high potential of 5 V-class.

KCI등재

8열적 안정한 압력센서 제작을 위한 보론(B) 이온 주입 n형 Si 에피 전극 연구

저자 : 최경근 ( Kyeong-keun Choi ) , 강문식 ( Moon Sik Kang )

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 1호 발행 연도 : 2018 페이지 : pp. 40-46 (7 pages)

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In this paper, we focus on optimization of a boron (11B)-implanted n type Si epi substrate for obtaining near-zero temperature coefficient of resistance (TCR) at temperature range from 25 to 125 °C. The 11B-implantation on the N type-Si epi substrate formed isolation from the rest of the N-type Si by the depletion region of a PN junction. The TCR increased as the temperature of rapid thermal anneal (RTA) was increased at the temperature range from 900 °C to 1000°C for the p+ contact with implantation at dose of 1E16/cm2, but sheet resistance of this film was decreased. After the optimization of anneal process condition, the TCR of 1126.7±30.3 (ppm/K) was obtained for the p- resistor-COB package chips contained p+ contact with the implantation of 5E14/cm2. This shows the potential of the 11B-implanted n type Si epi substrate as a resistor for pressure sensor in thermal stable environment applications..

KCI등재

9입사광량의 조절과 이에 따른 비분산 적외선 알코올 센서의 온도 특성과 보정

저자 : 김진호 ( Jinho Kim ) , 조희찬 ( Heechan Cho ) , 이승환 ( Seunghwan Yi )

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 1호 발행 연도 : 2018 페이지 : pp. 47-54 (8 pages)

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In this paper, we describe the thermal characteristics of the output voltages of ethanol gas sensor according to the amount of radiation incident on the infrared sensors located at each focal point of two elliptical waveguides. In order to verify the output characteristics of the gas sensor according to the amount of incident light on the infrared sensor, two combinations of sensor modules were fabricated. Hydrophobic thin film is deposited on one of the reflectors of sensor modules and one of the two infrared sensors was equipped with a hollow disk (1.0 Ø), and the temperature characteristics of the infrared sensor equipped with the hollow disk (1.0 Ø) and the infrared sensor without the disk were tested. The temperature was varied from 253 K to 333 K at 10 K intervals based on 298 K. The properties of ethanol gas sensor have been identified with respect to varying temperature for a range of ethanol concentration from 0 ppm to 500 ppm. In the case of an infrared sensor equipped with a hollow disk (1.0 Ø), the output voltage of the sensor decreased by 0.8 mV and 1 mV, respectively, as the temperature increased. Conversely, the output voltage of the diskless infrared sensor showed an average increase of 67 mV and 57 mV as the temperature increased. The ethanol concentrations estimated on the basis of results show an error of more than 10 % for less than 100 ppm concentration. However, if the ethanol concentration exceeds 100 ppm, the gas concentration can be estimated within the range of ±10%.

KCI등재

10표면 촉매 화학 반응을 이용한 크기 조절이 가능한 홀 어레이 제작

저자 : 박형주 ( Hyung Ju Park ) , 박정원 ( Jeong Won Park ) , 이대식 ( Dae-sik Lee ) , 표현봉 ( Hye

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 1호 발행 연도 : 2018 페이지 : pp. 55-58 (4 pages)

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Low-cost and large-scale fabrication method of nanohole array, which comprises nanoscale voids separated by a few tens to a few hundreds of nanometers, has opened up new possibilities in biomolecular sensing as well as novel frontier optical devices. One of the key aspects of the nanohole array research is how to control the hole size following each specific needs of the hole structure. Here, we report the extensive study on the fine control of the hole size within the range of 500-2500 nm via surface-catalyzed chemical deposition. The initial hole structures were prepared via conventional photo-lithography, and the hole size was decreased to a designed value through the surface-catalyzed chemical reduction of the gold ion on the predefined hole surfaces, by simple dipping of the hole array device into the aqueous solution of gold chloride and hydroxylamine. The final hole size was controlled by adjusting reaction time, and the optimal experimental condition was obtained by doing a series of characterization experiments. The characterization of size-controlled hole array was systematically examined on the image results of optical microscopy, field emission scanning electron microscopy(FESEM), atomic-force microscopy(AFM), and total internal reflection microscopy.

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