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JOURNAL OF SENSOR SCIENCE AND TECHNOLOGY

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수록정보
수록범위 : 1권1호(1992)~29권5호(2020) |수록논문 수 : 1,802
센서학회지
29권5호(2020년 09월) 수록논문
최근 권호 논문
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KCI등재

1Quantitative Monitoring of Body Pressure Distribution Using Built-in Optical Sensors

저자 : Kang-ho Lee , Yeong-eun Kwon , Jihyeon Seo , Byunghun Lee , Dongkyu Lee , Ohwon Kwon

발행기관 : 한국센서학회 간행물 : 센서학회지 29권 5호 발행 연도 : 2020 페이지 : pp. 279-282 (4 pages)

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In this study, body pressure was quantitatively detected using built-in optical sensors, inside an air cushion seat. The proposed system visualizes the effect of the body pressure distribution on the air cushion seat. The built-in sensor is based on the time-of-flight (ToF) optical method, instead of the conventional electrical sensor. A ToF optical sensors is attached to the bottom surface of the air-filled cells in the air cushion. Therefore, ToF sensors are durable, as they do not come in physical contact with the body even after repeated use. A ToF sensor indirectly expresses the body pressure by measuring the change in the height of the air-filled cell, after being subjected to the weight of the body. An array of such sensors can measure the body pressure distribution when the user sits on the air cushion seat. We implemented a prototype of the air cushion seat equipped with 7 ToF optical sensors and investigated its characteristics. In this experiment, the ToF optical pressure sensor successfully identified the pressure distribution corresponding to a sitting position. The data were accessed through a mobile device.

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2Bluetooth Low-Energy Current Sensor Compensated Using Piecewise Linear Model

저자 : Jung-won Shin

발행기관 : 한국센서학회 간행물 : 센서학회지 29권 5호 발행 연도 : 2020 페이지 : pp. 283-292 (10 pages)

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Current sensors that use a Hall element and Hall IC to measure the magnetic fields generated in steel silicon core gaps do not distinguish between direct and alternating currents. Thus, they are primarily used to measure direct current (DC) in industrial equipment. Although such sensors can measure the DC when installed in expensive equipment, ascertaining problems becomes difficult if the equipment is set up in an unexposed space. The control box is only opened during scheduled maintenance or when anomalies occur. Therefore, in this paper, a method is proposed for facilitating the safety management and maintenance of equipment when necessary, instead of waiting for anomalies or scheduled maintenance. A Bluetooth 4.0 low-energy current-sensor system based on near-field communication is used, which compensates for the nonlinearity of the current-sensor output signal using a piecewise linear model. The sensor is controlled using its generic attribute profile. Sensor nodes and cell phones used to check the signals obtained from the sensor at 50-A input currents showed an accuracy of ±1%, exhibiting linearity in all communications within the range of 0 to 50 A, with a stable output voltage for each communication segment.

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3Battery-less Pork Freshness Monitoring Based on High-Efficiency RF Energy Harvesting

저자 : Nam Hoang Nguyen , Minh Binh Lam , Wan-young Chung

발행기관 : 한국센서학회 간행물 : 센서학회지 29권 5호 발행 연도 : 2020 페이지 : pp. 293-302 (10 pages)

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Food safety has emerged as a growing concern for human health in recent times. Consuming contaminated food may lead to serious health problems, and therefore, a system for monitoring food freshness that is both non-detrimental to the quality of food and highly accurate is required to ensure that only high-quality fresh food packages are provided to the customers. This paper proposes a method to monitor and detect food quality using a compact smart sensor tag. The smart tag is composed of three ultra-low-power sensors, which monitor four major indicators of food freshness: temperature, humidity, and the concentrations of ammonia and hydrogen sulfide gases. An RF energy scavenging circuit is integrated into the smart sensor tag to harvest energy from radio waves at a high frequency of 13.56 MHz to supply sufficient power to the tag. Experimental results show that the proposed energy harvester can efficiently obtain energy at a distance of approximately 40 cm from a 4W reader. In addition, the proposed smart sensor tag can operate without any battery, thereby eliminating the requirement of frequent battery replacement and consequently decreasing the cost. Meanwhile, the freshness of preserved pork is continuously monitored under two conditions-room temperature and refrigerator temperature--both of which are the most common temperatures under which food is generally stored. The food-monitoring experiments are conducted over a period of one week using the proposed battery-less tag. Based on the experimental results, the food assessment is classified into four categories: fresh, normal, low, and spoiled.

KCI등재

4Infrared Light Absorbance: a New Method for Temperature Compensation in Nondispersive Infrared CO2 Gas Sensor

저자 : Seung Hwan Yi

발행기관 : 한국센서학회 간행물 : 센서학회지 29권 5호 발행 연도 : 2020 페이지 : pp. 303-311 (9 pages)

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Nondispersive infrared CO2 gas sensor was developed after the simulation of optical cavity structure and assembling the optical components: IR source, concave reflectors, Fresnel lens, a hollow disk, and IR detectors. By placing a hollow disk in front of reference IR detector, the output voltages are almost constant value, near to 70.2 mV. The absorbance of IR light, Fa, shows the second order of polynomial according to ambient temperatures at 1,500 ppm. The differential output voltages and the absorbance of IR light give a higher accuracy in estimations of CO2 concentrations with less than ± 1.5 % errors. After implementing the parameters that are dependent upon the ambient temperatures in microcontroller unit (MCU), the measured CO2 concentrations show high accuracies (less than ± 1.0 %) from 281 K to 308 K and the time constant of developed sensor is about 58 sec at 301 K. Even though the estimation errors are relatively high at low concentration, the developed sensor is competitive to the commercial product with a high accuracy and the stability.

KCI등재

5A Triboelectric Nanogenerator Design for the Utilization of Multi-Axial Mechanical Energies in Human Motions

저자 : Hee Jae Ryoo , Chan Woo Lee , Jong Won Han , Wook Kim , Dukhyun Choi

발행기관 : 한국센서학회 간행물 : 센서학회지 29권 5호 발행 연도 : 2020 페이지 : pp. 312-322 (11 pages)

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As the use of mobile devices increase, there is public interest in the utilization of the human motion generated mechanical energy. The human motion generated mechanical energies vary depending on the body region, type of motion, etc., and an appropriate device has to be designed to utilize them effectively. In this work, a device based on the principles of triboelectric generation and inertia was assessed in order to utilize the multi-axial mechanical energies generated by human motions. To improve the output performance we confirm the changes in the output that vary with the structural design, the reasons for such changes, and variations in performance based on the parts of the human body. In addition, the level of electrical energy generated based on motion type was measured; a maximum voltage of 30 V and a current of 2 μA were generated. Finally, the proposed device was utilized in LEDs used for lighting, thus demonstrating that multi-axial mechanical energies can be harvested effectively. Based on the results, we expect that the developed device can be utilized as a sensor to detect mechanical energies, to sense changes in motion, or as a generator for auxiliary power supply for mobile devices.

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6In0.8Ga0.2As HEMT 소자에서 Output-conductance가 차단 주파수에 미치는 영향에 대한 연구

저자 : 노태범 ( Tae-beom Rho ) , 김대현 ( Dae-hyun Kim )

발행기관 : 한국센서학회 간행물 : 센서학회지 29권 5호 발행 연도 : 2020 페이지 : pp. 324-327 (4 pages)

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The impact of output conductance (go) on the short-circuit current-gain cut-off frequency (fT) in In0.8Ga0.2As high-electron-mobility transistors (HEMTs) on an InP substrate was investigated. An attempted was made to extract the values of fT in a simplified small-signal model (SSM) of the HEMTs, derive an analytical formula for fT in terms of the extrinsic model parameters of the simplified SSM, which are related to the intrinsic model parameters of a general SSM, and verify its validity for devices with Lg from 260 to 25 nm. In longchannel devices, the effect of the intrinsic output conductance (goi) on fT was negligible. This was because, from the simplified SSM perspective, three model parameters, such as gm_ext, Cgs_ext and Cgd_ext, were weakly dependent on goi. However, in short-channel devices, goi was found to play a significant role in degrading fT as Lg was scaled down. The increase in goi in short-channel devices caused a considerable reduction in gm_ext and an overall increase in the total extrinsic gate capacitance, yielding a decrease in fT with goi. Finally, the results were used to infer how fT is influenced by goi in HEMTs, emphasizing that improving electrostatic integrity is also critical importance to benefit fully from scaling down Lg.

KCI등재

7졸-겔 공법으로 제작된 SnO2 박막 트랜지스터의 광전기적 특성

저자 : 이창민 ( Changmin Lee ) , 장재원 ( Jaewon Jang )

발행기관 : 한국센서학회 간행물 : 센서학회지 29권 5호 발행 연도 : 2020 페이지 : pp. 328-331 (4 pages)

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In this study, a highly crystalline SnO2 thin film was formed using a sol-gel process. In addition, a SnO2 thin-film transistor was successfully fabricated. The fabricated SnO2 thin-film transistor exhibited conventional n-type semiconductor properties, with a mobility of 0.1 cm2 V-1 s-1, an on/off current ratio of 1.2 × 105, and a subthreshold swing of 2.69. The formed SnO2 had a larger bandgap(3.95 eV) owing to the bandgap broadening effect. The fabricated photosensor exhibited a responsivity of 1.4 × 10-6 Jones, gain of 1.43 × 107, detectivity of 2.75 × 10-6 cm Hz1/2 W-1, and photosensitivity of 4.67 × 102.

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8InGaZnO 용액의 농도가 Drop-casting으로 제작된 산화물 박막 트랜지스터의 전기적 특성에 미치는 영향

저자 : 노은경 ( Eun-kyung Noh ) , 유경민 ( Kyeong Min Yu ) , 김민회 ( Min-hoi Kim )

발행기관 : 한국센서학회 간행물 : 센서학회지 29권 5호 발행 연도 : 2020 페이지 : pp. 332-335 (4 pages)

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Drop casting, a solution process, is a simple low-cost fabrication technique that does not waste material. In this study, we elucidate the effect of the concentration of a InGaZnO solution on the electrical properties of drop-cast oxide thin-film transistors. The higher the concentration the larger the amount of remnant InGaZnO solutes, which yields a thicker thin film. Accordingly, the electrical properties were strongly dependent on the concentration. At a high concentration of 0.3 M (or higher), a large current flowed but did not lead to switching characteristics. At a concentration lower than 0.01 M, switching characteristics were observed, but the mobility was small. In addition to a high mobility, sufficient switching characteristics were obtained at a concentration of 0.1 M owing to the appropriate thickness of the semiconductor layer. This study provides a technical basis for the low-cost fabrication of switching devices capable of driving a sensor array.

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9무게측정방식에 따른 Lever-linked Roberval Mechanism의 설계특성

저자 : 안지윤 ( Ji Yun An ) , 안중환 ( Jung Hwan Ahn ) , 이길승 ( Gil Seung Lee ) , 김화영 ( Hwa Young Kim )

발행기관 : 한국센서학회 간행물 : 센서학회지 29권 5호 발행 연도 : 2020 페이지 : pp. 336-341 (6 pages)

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The deflection and null balance methods are used for precision force measurement in the precision industry. Since both methods are based on deformation, the performance of the load cell mechanism is important. In this study, the design variables were obtained via the free body diagram of a lever-linked Roberval mechanism (combined with a flexible hinge link and a Roberval mechanism), and the design characteristics were analyzed according to the weight method. Based on the design characteristics, the optimal design was conducted according to the weight method and FEM was used to verify its reliability.

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10부영양화 사전 예방을 위한 휴대용 총인 모니터링 시스템 개발

저자 : 정동건 ( Dong Geon Jung ) , 김승덕 ( Seung Deok Kim ) , 권순열 ( Soon Yeol Kwon ) , 이재용 ( Jae Yong Lee ) , 김유성 ( Yu Seong Kim ) , 이준엽 ( Junyeop Lee ) , 김재건 ( Jaekeon Kim ) , 김세완 ( Sae-wan Kim ) , 공성호 ( Seong Ho Kong ) , 정대웅 ( Daewoong Jung )

발행기관 : 한국센서학회 간행물 : 센서학회지 29권 5호 발행 연도 : 2020 페이지 : pp. 342-347 (6 pages)

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In this study, a portable total-phosphorus (TP) monitoring system utilizing a photocatalytic-reaction-based pretreatment method is proposed, fabricated, and characterized. Commercial TP monitoring systems are only used in laboratories because of their complex monitoring procedure, bulk-size, and high-cost. In particular, pretreatment in commercial TP monitoring systems is performed at high temperatures (> 120 ℃) and pressure (> 1.1 kg cm-2) making it difficult to minimize the scale of the systems. The proposed TP monitoring system employs a pretreatment method with a photocatalytic reaction; thus, its size can be reduced, as photocatalytic reactions occur at room temperature and atmospheric pressure. Analytes with various TP concentrations are pretreated using the proposed portable TP monitoring system and are quantitatively measured with an LED and a photodiode.

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1연안해역에서 석유오염물질의 세균학적 분해에 관한 연구

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