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JOURNAL OF SENSOR SCIENCE AND TECHNOLOGY

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수록정보
수록범위 : 1권1호(1992)~30권4호(2021) |수록논문 수 : 1,861
센서학회지
30권4호(2021년 07월) 수록논문
최근 권호 논문
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1Highly sensitive xylene sensors using Fe2O3-ZnFe2O4 composite spheres

저자 : Jin Fang Chan , Jae Kyoung Jeon , Young Kook Moon , Jong-heun Lee

발행기관 : 한국센서학회 간행물 : 센서학회지 30권 4호 발행 연도 : 2021 페이지 : pp. 191-195 (5 pages)

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Pure ZnFe2O4 and Fe2O3-ZnFe2O4 hetero-composite spheres were prepared by ultrasonic spray pyrolysis of a solution containing Znand Fe-nitrates. Additionally, the sensing characteristics of these spheres in the presence of 5 ppm ethanol, benzene, p-xylene, toluene, and CO (within the temperature range of 275-350 ℃) were investigated. The Fe2O3-ZnFe2O4 hetero-composite sensor with a cation ratio of [Zn]:[Fe]=1:3 exhibited a high response (resistance ratio = 140.2) and selectivity (response to p-xylene/response to ethanol = 3.4) to 5 ppm p-xylene at 300 ℃, whereas the pure ZnFe2O4 sensor showed a comparatively lower gas response and selectivity. The reasons for the superior response and selectivity to p-xylene in Fe2O3-ZnFe2O4 hetero-composite sensor were discussed in relation to the electronic sensitization due to charge transfer at Fe2O3-ZnFe2O4 interface and Fe2O3-induced catalytic promotion of gas sensing reaction. The sensor can be used to monitor harmful volatile organic compounds and indoor air pollutants.

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2Design and implementation of optical identification system using visible light and infrared

저자 : Seong-ho Lee

발행기관 : 한국센서학회 간행물 : 센서학회지 30권 4호 발행 연도 : 2021 페이지 : pp. 196-203 (8 pages)

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In this study, an optical identification system was developed, wherein visible light is used to transmit the interrogating signal, and infrared is used to send the response signal. In the reader, visible light from a light emitting diode (LED) array was modulated via modified pulse width modulation for flicker-free illumination and dimming control. Moreover, the duty factor of the dimming control time was employed to control the illumination from the LED. In the transponder, the spike signal in the output of the high-pass filter was utilized to recover the interrogating signal while preventing interference from the 120-Hz noise from adjacent lighting lamps. The illumination was controlled in 26-86% range of the constant wave LED illumination by changing the duty factor from 20% to 90%. This configuration is advantageous for the construction of optical identification systems for automatic security check and car fare calculation at toll gates or parking facilities.

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3A case study to standardize odor metadata obtained from coffee aroma based on E-nose using ISO/IEC 23005 (MPEG-V) for olfactory-enhanced multimedia

저자 : Jang-sik Choi , Hyung-gi Byun

발행기관 : 한국센서학회 간행물 : 센서학회지 30권 4호 발행 연도 : 2021 페이지 : pp. 204-209 (6 pages)

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Immersive multimedia comprising metadata for five senses can provide user experience by stimulating memory and sensation. In the case of olfactory-enhanced multimedia, a computer-generated smell is combined with additional media content to create a richer and/ or more realistic experience for the user. Although several studies have been conducted on olfactory-enhanced multimedia using e-nose and olfactory display, their practical applications have been severely restricted owing to the absence of a related standard. This paper proposes a method to standardize odor metadata obtained from an e-nose system, which has been particularly used to acquire data from different coffee aromas. Subsequently, the data were transferred to an odor display applicable for olfactory-enhanced multimedia using the ISO/IEC 23005 (MPEG-V) data template.

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4α-Fe2O3 nanostructure-based gas sensors

저자 : Seonyong Lee , Ho Won Jang

발행기관 : 한국센서학회 간행물 : 센서학회지 30권 4호 발행 연도 : 2021 페이지 : pp. 210-217 (8 pages)

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Gas sensors based on semiconducting metal oxides have attracted considerable attention for various applications owing to their facile, cheap, and small-scale manufacturing processes. Hematite (α-Fe2O3) is widely considered as a promising candidate for a gas-sensing material owing to not only its abundance in the earth's crust and low price but also its chemical stability and suitable bandgap energy. However, only a few studies have been performed in this direction because of the low gas response and sluggish response of hematite-based gas sensors. Nanostructures present a representative solution to both overcome these disadvantages and exploit the desirable features to produce high-performance gas sensors. However, several challenges remain for adopting gas sensors based on metal oxide nanostructures, such as improving cost efficiency and facilitating mass production. This review summarizes the recent studies on gas sensors based on hematite nanostructures. It also provides useful insights into various strategies for enhancing the gas-sensing properties of gas sensors based on hematite nanostructures.

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5Designing a nanocrystal-based temperature and strain multi-sensor with one-step inkjet printing

저자 : Junsung Bang , Junhyuk Ahn , Soong Ju Oh

발행기관 : 한국센서학회 간행물 : 센서학회지 30권 4호 발행 연도 : 2021 페이지 : pp. 218-222 (5 pages)

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Wearable multi-sensors based on nanocrystals have attracted significant attention, and studies on patterning technology to implement such multi-sensors are underway. Conventional patterning processes may affect material properties based on high temperatures and harsh chemical conditions. In this study, we developed an inkjet printing technique that can overcome these drawbacks through the application of patterning processes at room temperature and atmospheric pressure. Nanocrystal-based ink is used to adjust properties efficiently. Additionally, the viscosity and surface tension of the solvents are investigated and optimized to increase patterning performance. In the patterning process, the electrical, electrothermal, and electromechanical properties of the nanocrystal pattern are controlled by the ligand exchange process. Experimental results demonstrate that a multi-sensor with a temperature coefficient of resistance of 3.82 × 10-3 K-1 and gauge factor of 30.6 can be successfully fabricated using one-step inkjet printing.

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6Low-Power CMOS image sensor with multi-column-parallel SAR ADC

저자 : Jang-Su Hyun , Hyeon-june Kim

발행기관 : 한국센서학회 간행물 : 센서학회지 30권 4호 발행 연도 : 2021 페이지 : pp. 223-228 (6 pages)

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This work presents a low-power CMOS image sensor (CIS) with a multi-column-parallel (MCP) readout structure while focusing on improving its performance compared to previous works. A delta readout scheme that utilizes the image characteristics is optimized for the MCP readout structure. By simply alternating the MCP readout direction for each row selection, additional memory for the rowto- row delta readout is not required, resulting in a reduced area of occupation compared to the previous work. In addition, the bias current of a pre-amplifier in a successive approximate register (SAR) analog-to-digital converter (ADC) changes according to the operating period to improve the power efficiency. The prototype CIS chip was fabricated using a 0.18-μm CMOS process. A 160 × 120 pixel array with 4.4 μm pitch was implemented with a 10-bit SAR ADC. The prototype CIS demonstrated a frame rate of 120 fps with a total power consumption of 1.92mW.

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7탄소나노튜브 대면적 어셈블리를 통한 고감도-고선택성 과산화수소 센서 개발

저자 : 이동욱 ( Dongwook Lee ) , 안희호 ( Heeho Ahn ) , 서병관 ( Byeong-Gwuan Seo ) , 이승우 ( Seung-woo Lee )

발행기관 : 한국센서학회 간행물 : 센서학회지 30권 4호 발행 연도 : 2021 페이지 : pp. 229-235 (7 pages)

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This study presents a simple approach for the assembly of a free-standing conductive electronic nanofilm of single-walled carbon nanotubes (SWNTs) suitable for enzymatic electrochemical biosensors. A large-scale SWNT electronic film was successfully produced by the dialysis of p-Terphenyl-4,4´´-dithiol (TPDT)-treated SWNTs. Furthermore, Horseradish peroxidase (HRP) was immobilized on the TPDT-SWNT electronic film, and the enzymatic detection of hydrogen peroxide (H2O2) was demonstrated without mediators. The detection of H2O2 in the negative potential range (-0.4 V vs. Ag/AgCl) was achieved by direct electron transfer of heme-based enzymes that were immobilized on the TPDT-SWNT electronic film. The SWNT-based biosensor exhibited a wide detection range of H2O2 from 10 μM to 10mM. The HRP-doped SWNT electronic film achieved a high sensitivity of 342 μmA/mM·㎠ and excellent selectivity against a variety of redox-active interfering substances, such as ascorbic acid, uric acid, and acetaminophen.

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8CMOS 표준 공정을 통한 SPM 프로브의 제작 및 그 성능 평가

저자 : 이훈택 ( Hoontaek Lee ) , 김준수 ( Junsoo Kim ) , 신금재 ( Kumjae Shin ) , 문원규 ( Wonkyu Moon )

발행기관 : 한국센서학회 간행물 : 센서학회지 30권 4호 발행 연도 : 2021 페이지 : pp. 236-242 (7 pages)

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In this paper, we report the fabrication of the tip-on-gate of a field-effect-transistor (ToGoFET) probe using a standard complementary metal-oxide-semiconductor (CMOS) process and the performance evaluation of the fabricated probe. After the CMOS process, I-V characteristic measurement was performed on the reference MOSFET. We confirmed that the ToGoFET probe could be operated at a gate voltage of 0 V due to channel ion implantation. The transconductance at the operating point (Vg = 0 V, Vd = 2 V) was 360 μA/ V. After the fabrication process was completed, calibration was performed using a pure metal sample. For sensitivity calibration, the relationship between the input voltage of the sample and the output current of the probe was determined and the result was consistent with the measurement result of the reference MOSFET. An oxide sample measurement was performed as an example of an application of the new ToGoFET probe. According to the measurement, the ToGoFET probe could spatially resolve a hundred nanometers with a height of a few nanometers in both the topographic image and the ToGoFET image.

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9분류식 습도 발생 장치 개발 및 라디오존데 습도센서 저온 효과 보정에 활용 연구

저자 : 장은정 ( Eun-jeong Jang ) , 이영석 ( Young-suk Lee ) , 최병일 ( Byung-il Choi ) , 최윤석 ( Yoonseuk Choi ) , 이상욱 ( Sang-wook Lee )

발행기관 : 한국센서학회 간행물 : 센서학회지 30권 4호 발행 연도 : 2021 페이지 : pp. 243-249 (7 pages)

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Humidity is an important physical quantity that is closely related with the quality of everyday life as well as the quality control of products in various industries. Here, we have developed a divided-flow type humidity generator of which humidity generation is faster than the saturator-based humidity generator in ppm level. The operation principle of the divided-flow humidity generator is first introduced. Then, the performance of the divided-flow humidity generator is verified by testing the radiosonde humidity sensor at low temperature. As a result, the humidity generated from the divided-flow humidity generator is consistent with the saturator-based precision humidity generator within 1.6% relative humidity in the range from 10% to 40% at -45 ℃. It is also found that the radiosonde humidity sensor shows measurement errors by 3% - 5% at -45 ℃ when it is only calibrated at room temperature. The response times of radiosonde humidity sensor using the divided-flow humidity generator are between about 2 and 9 minutes, whereas those by the saturatorbased humidity generator are about 20 minutes. In this regard, the divided-flow humidity generator has a merit in terms of fast humidity changes for the calibration of radiosonde humidity sensors at low-temperatures.

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10비분산적외선 CO2 센서를 위한 DBR기반의 패브리 페로-필터 설계 및 성능 연구

저자 : 도남곤 ( Nam Gon Do ) , 이준엽 ( Junyeop Lee ) , 정동건 ( Dong Geon Jung ) , 공성호 ( Seong Ho Kong ) , 정대웅 ( Daewoong Jung )

발행기관 : 한국센서학회 간행물 : 센서학회지 30권 4호 발행 연도 : 2021 페이지 : pp. 250-254 (5 pages)

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A highly sensitive and selective non-dispersive infrared (NDIR) carbon dioxide gas sensor requires achieving high transmittance and narrow full width at half maximum (FWHM), which depends on the interface of the optical filter for precise measurement of carbon dioxide concentration. This paper presents the design, simulation, and fabrication of a Fabry-Perot filter based on a distributed Bragg reflector (DBR) for a low-cost NDIR carbon dioxide sensor. The Fabry-Perot filter consists of upper and lower DBR pairs, which comprise multilayered stacks of alternating high- and low-index thin films, and a cavity layer for the resonance of incident light. As the number of DBR pairs inside the reflector increases, the FWHM of the transmitted light becomes narrower, but the transmittance of light decreases substantially. Therefore, it is essential to analyze the relationship between the FWHM and transmittance according to the number of DBR pairs. The DBR is made of silicon and silicon dioxide by RF magnetron sputtering on a glass wafer. After the optimal conditions based on simulation results were realized, the DBR exhibited a light transmittance of 38.5% at 4.26 μm and an FWHM of 158 nm. The improved results substantiate the advantages of the low-cost and minimized process compared to expensive commercial filters.

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