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JOURNAL OF SENSOR SCIENCE AND TECHNOLOGY

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수록정보
수록범위 : 1권1호(1992)~27권6호(2018) |수록논문 수 : 1,671
센서학회지
27권6호(2018년 11월) 수록논문
최근 권호 논문
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KCI등재

1Averaging Current Adjustment Technique for Reducing Pixel Resistance Variation in a Bolometer-Type Uncooled Infrared Image Sensor

저자 : Sang-hwan Kim , Byoung-soo Choi , Jimin Lee , Junwoo Lee , Jae-hyoun Park , Kyoung-il Lee , Jang-kyoo Shin

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 6호 발행 연도 : 2018 페이지 : pp. 357-361 (5 pages)

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This paper presents an averaging current adjustment technique for reducing the pixel resistance variation in a bolometer-type uncooled infrared image sensor. Each unit pixel was composed of an active pixel, a reference pixel for the averaging current adjustment technique, and a calibration circuit. The reference pixel was integrated with a polysilicon resistor using a standard complementary metal-oxide-semiconductor (CMOS) process, and the active pixel was applied from outside of the chip. The averaging current adjustment technique was designed by using the reference pixel. The entire circuit was implemented on a chip that was composed of a reference pixel array for the averaging current adjustment technique, a calibration circuit, and readout circuits. The proposed reference pixel array for the averaging current adjustment technique, calibration circuit, and readout circuit were designed and fabricated by a 0.35-μm standard CMOS process.

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2CMOS Binary Image Sensor with Gate/Body-Tied PMOSFET-Type Photodetector for Low-Power and Low-Noise Operation

저자 : Junwoo Lee , Byoung-soo Choi , Donghyun Seong , Jewon Lee , Sang-hwan Kim , Jimin Lee , Jang-kyoo Shin , Pyung Choi

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 6호 발행 연도 : 2018 페이지 : pp. 362-367 (6 pages)

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A complementary metal oxide semiconductor (CMOS) binary image sensor is proposed for low-power and low-noise operation. The proposed binary image sensor has the advantages of reduced power consumption and fixed pattern noise (FPN). A gate/body-tied (GBT) p-channel metal-oxide-semiconductor field-effect transistor (PMOSFET)-type photodetector is used as the proposed CMOS binary image sensor. The GBT PMOSFET-type photodetector has a floating gate that amplifies the photocurrent generated by incident light. Therefore, the sensitivity of the GBT PMOSFET-type photodetector is higher than that of other photodetectors. The proposed CMOS binary image sensor consists of a pixel array with 394 (H) × 250 (V) pixels, scanners, bias circuits, and column parallel readout circuits for binary image processing. The proposed CMOS binary image sensor was analyzed by simulation. Using the dynamic comparator, a power consumption reduction of approximately 99.7% was achieved, and this performance was verified by the simulation by comparing the results with those of a two-stage comparator. Also, it was confirmed using simulation that the FPN of the proposed CMOS binary image sensor was successfully reduced by use of the double sampling process.

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3Effects of Long-term Exposure of High and Low Humidity on Thin-film Humidity Sensors

저자 : Sang-wook Lee , Byung Il Choi , Jong Chul Kim , Sang-bong Woo

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 6호 발행 연도 : 2018 페이지 : pp. 368-373 (6 pages)

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The effects of long-term exposure of high and low humidity on thin-film humidity sensors are investigated. Five commercially available thin-film humidity sensors are initially calibrated in a humidity chamber as a reference before longterm exposure to high and low humidity. Then, the sensors are kept in a high-humidity environment (~95 %rh) for four months. After the exposure, the sensors are calibrated in the same manner as the initial calibration. Consequently, the device reading values from the humidity sensors are elevated up to about 5 %rh. Interestingly, the degree of elevation by the high-humidity exposure shows a negative correlation with the price of the humidity sensors. Humidity sensors are then kept in a low-humidity environment (~10 %rh) for another four months. After the exposure, a calibration similar to the initial calibration is performed. As a result, the device reading from humidity sensors is decreased, indicating a recovery from the effect of high-humidity exposure. The durability test conducted in this study provides experimental evidence for the use of thin-film humidity sensors in high-humidity environments such as greenhouses and food factories for a long period of time.

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4Development of an Impedance Matching Layer in an Ultrasound Transducer with Gradient Properties

저자 : Jihoon Jeong

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 6호 발행 연도 : 2018 페이지 : pp. 374-379 (6 pages)

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The piezocomposite transducer is widely used because it is highly efficient in transforming electric energy into mechanical energy, and its frequency range is broader than that of other types of ultrasound transducers. A general piezocomposite transducer is composed of an acoustic lens, impedance matching layers, piezoelectric materials, and backing layers. When an input voltage is applied to a piezoelectric material as an active material, it generates sound waves while vibrating. At that time, an impedance matching layer helps the sound waves to propagate forward while reducing the impedance mismatch that may occur at the interface between the active material and its front material. The impedance mismatch has a negative effect on the signal of an ultrasound transducer; thus, it is important to design a matching layer to overcome the issue. In this study, an optimized feature of a matching layer with gradient properties is studied. An objective function is defined to minimize both the average and the deviation of the reflection coefficients that are functions of the frequencies. As a result, an improvement in the signal characteristics with respect to the sensitivity and bandwidth is reported.

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5변화구 투구가 가능한 PLC기반의 피칭 시스템 구현

저자 : 김민규 ( Min-kyu Kim )

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 6호 발행 연도 : 2018 페이지 : pp. 380-385 (6 pages)

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Recently, interest in baseball has been increasing as the level of international baseball games, the popularity of domestic leagues, and the number of players entering the MLB has increased. In this paper, we propose a pitching system that can be applied to both professional and amateur baseball. The pitching system consists of a control module using MSB764T PLC, a pitching mechanism including AC motors and a ball feed rail, an HMI using the CHA-070WR model, inverter, etc. To pitch the breaking balls, the two AC motors each use an inverter to independently control the speed. The implemented pitching system was experimented on, investigating ball speed and ball movement according to RPM using the BUSHNELL Velocity Speed Gun. Experimental results on ball speed are similar to the theoretical data and the measured data. From the experimental data, it is confirmed that the damping coefficient value for the pitching ball is about 0.98. In the case of the breaking ball, the larger the difference between the speeds on the sides of the ball and the faster the ball speed, the larger the bending degree.

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6충돌 액막 분석을 위한 전기전도 액막 두께 측정장치 최적설계

저자 : 이형원 ( Hyeongwon Lee ) , 이현창 ( Hyunchang Lee ) , 김태성 ( Taesung Kim ) , 안규복 ( Kyubok Ahn ) , 윤영빈 ( Youngbin Yoon )

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 6호 발행 연도 : 2018 페이지 : pp. 386-391 (6 pages)

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To analyze the film cooling in a liquid rocket engine, it is necessary to understand the characteristics of the wall-impingement liquid film. We designed an optimal two-dimensional device for measuring the thickness of the liquid film thickness. This device quantitatively measures the liquid-film thickness distribution. In previous liquid-film thickness measuring devices, the liquid film was formed over the entire area of the sensor. However, its formation depended on injection conditions. To compensate for this, optimal resistors are selected. Additionally, saturation variations with partial saturation are analyzed. Furthermore, calibration using the enhanced plate method is conducted with improvements in spatial resolution. The device designed here can be used to analyze the properties of an impingement liquid film with a slit injector. This study can be used for film-cooling analysis in liquid rocket engines.

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7Poly-dimethylsiloxane (PDMS) 기판 위에 형성된 나노구조를 이용한 시각 인장센서의 개발

저자 : 김건휘 ( Geon Hwee Kim ) , 우현수 ( Hyeonsu Woo ) , 임근배 ( Geunbae Lim ) , 안태창 ( Taechang An )

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 6호 발행 연도 : 2018 페이지 : pp. 392-396 (5 pages)

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Structural color has many advantages over pigment based color. In recent years, researches are being conducted to apply these advantages to applications such as wearable devices. In this study, strain sensor, a kind of wearable device, was developed using structural color. The use of structural color has the advantage of not using energy and complex measuring equipment to measure strain rate. Wrinkle structure was fabricated on the surface of Poly-dimethylsiloxane (PDMS) and used it as a sensor which color changes according to the applied strain. In addition, a transmittance-changing sensor was developed and fabricated by synthesizing additional glass nanoparticles. Furthermore, a strain sensor was developed that is largely transparent at the target strain and opaque otherwise.

KCI등재

8운전자의 체압 분포 및 시트변형에 대한 정량화 측정시스템

저자 : 권영은 ( Yeong-eun Kwon ) , 김윤영 ( Yun-young Kim ) , 이용구 ( Yong-goo Lee ) , 이동규 ( Dongkyu Lee ) , 권오원 ( Ohwon Kwon ) , 강신원 ( Shin-won Kang ) , 이강호 ( Kang-ho Lee )

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 6호 발행 연도 : 2018 페이지 : pp. 397-402 (6 pages)

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Proper seat design is critical to the safety, comfort, and ergonomics of automotive driver's seats. To ensure effective seat design, quantitative methods should be used to evaluate the characteristics of automotive seats. This paper presents a system that is capable of simultaneously monitoring body pressure distribution and surface deformation in a textile material. In this study, a textile-based capacitive sensor was used to detect the body pressure distribution in an automotive seat. In addition, a strain gauge sensor was used to detect the degree of curvature deformation due to high-pressure points. The textile-based capacitive sensor was fabricated from the conductive fabric and a polyurethane insulator with a high signal-to-noise ratio. The strain gauge sensor was attached on the guiding film to maximize the effect of its deformation due to bending. Ten pressure sensors were placed symmetrically in the hip area and six strain gauge sensors were distributed on both sides of the seat cushion. A readout circuit monitored the absolute and relative values from the sensors in real-time, and the results were displayed as a color map. Moreover, we verified the proposed system for quantifying the body pressure and fabric deformation by studying 18 participants who performed three predefined postures. The proposed system showed desirable results and is expected to improve seat safety and comfort when applied to the design of various seat types. Moreover, the proposed system will provide analytical criteria in the design and durability testing of automotive seats.

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9팔라듐이 코팅된 광섬유 격자를 이용한 절연유속의 용존 수소가스 검출

저자 : 김광택 ( Kwang Taek Kim ) , 최누리 ( Nu Ri Choi ) , 백세종 ( Se-jong Baik )

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 6호 발행 연도 : 2018 페이지 : pp. 403-406 (4 pages)

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We have investigated a fiber-optic sensor for detecting the hydrogen gas dissolved in insulation oil based on a palladium (Pd)-coated fiber Bragg grating (FBG). As the palladium absorbs the hydrogen gas dissolved in the insulation oil, its volume expands and the Bragg wavelength shifts to a longer wavelength. The experimental results showed that the Bragg wavelength of FBG increased to 70 nm when the concentration of hydrogen dissolved in the insulation oil was 409 ppm.

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10베게에 삽입된 PVDF센서를 이용한 무호흡증 측정

저자 : 금동위 ( Dong-wi Keum ) , 김정도 ( Jeong-do Kim )

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 6호 발행 연도 : 2018 페이지 : pp. 407-413 (7 pages)

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Most sleep apnea patients exhibit severe snoring, and long-lasting sleep apnea may cause insomnia, hypertension, cardiovascular diseases, stroke, and other diseases. Although polysomnography is the typical sleep diagnostic method to accurately diagnose sleep apnea by measuring a variety of bio-signals that occur during sleep, it is inconvenient as the patient has to sleep with attached electrodes at the hospital for the diagnosis. In this study, a diagnostic pillow is designed to measure respiration, heart rate, and snoring during sleep, using only one polyvinylidene fluoride (PVDF) sensor. A PVDF sensor with piezoelectric properties was inserted into a specially made instrument to extract accurate signals regardless of the posture during sleep. Wavelet analysis was used to identify the extractability and frequency domain signals of respiration, heart rate, and snoring from the signals generated by the PVDF sensor. In particular, to separate the respiratory signal in the 0.2~0.5 Hz frequency region, wavelet analysis was performed after removing 1~2 Hz frequency components. In addition, signals for respiration, heart rate, and snoring were separated from the PVDF sensor signal through a Butterworth filter and median filter based on the information obtained from the wavelet analysis. Moreover, the possibility of measuring sleep apnea from these separated signals was confirmed. To verify the usefulness of this study, data obtained during sleeping was used.

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1연안해역에서 석유오염물질의 세균학적 분해에 관한 연구

(2006)홍길동 외 1명심리학41회 피인용

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