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JOURNAL OF SENSOR SCIENCE AND TECHNOLOGY

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수록정보
수록범위 : 1권1호(1992)~27권4호(2018) |수록논문 수 : 1,647
센서학회지
27권4호(2018년 07월) 수록논문
최근 권호 논문
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1Autonomous Drone Path Planning for Environment Sensing

저자 : Beomsoo Kim , Sooyong Lee

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 4호 발행 연도 : 2018 페이지 : pp. 209-215 (7 pages)

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Recent research in animal behavior has shown that gradient information plays an important role in finding food and home. It is also important in optimization of performance because it indicates how the inputs should be adjusted for maximization/minimization of a performance index. We introduce perturbation as an additional input to obtain gradient information. Unlike the typical approach of calculating the gradient from the derivative, the proposed processing is very robust to noise since it is performed as a summation. Experimental results prove the validity of the process of spatial gradient acquisition. Quantitative indices for measuring the effect of the amplitude and the frequency are developed based on linear regression analysis. Drones are very useful for environmental monitoring and an autonomous path planning is required for unstructured environment. Guiding the drone for finding the origin of the interested physical property is done by estimating the gradient of the sensed value and generating the drone trajectories in the direction which maximizes the sensed value. Simulation results show that the proposed method can be successfully applied to identify the source of the physical quantity of interest by utilizing it for path planning of an autonomous drone in 3D environment.

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2Visual Sensing of the Light Spot of a Laser Pointer for Robotic Applications

저자 : Sung-ho Park , Dong Uk Kim , Yongtae Do

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 4호 발행 연도 : 2018 페이지 : pp. 216-220 (5 pages)

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In this paper, we present visual sensing techniques that can be used to teach a robot using a laser pointer. The light spot of an off-the-shelf laser pointer is detected and its movement is tracked on consecutive images of a camera. The three-dimensional position of the spot is calculated using stereo cameras. The light spot on the image is detected based on its color, brightness, and shape. The detection results in a binary image, and morphological processing steps are performed on the image to refine the detection. The movement of the laser spot is measured using two methods. The first is a simple method of specifying the region of interest (ROI) centered at the current location of the light spot and finding the spot within the ROI on the next image. It is assumed that the movement of the spot is not large on two consecutive images. The second method is using a Kalman filter, which has been widely employed in trajectory estimation problems. In our simulation study of various cases, Kalman filtering shows better results mostly. However, there is a problem of fitting the system model of the filter to the pattern of the spot movement.

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3Discrimination of Gasoline and Diesel Fuels Using Oxide Semiconductor Gas Sensors

저자 : Young Kook Moon , Min Sung Shin , Young-moo Jo , Kyeorei Lim ,

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 4호 발행 연도 : 2018 페이지 : pp. 221-226 (6 pages)

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Misfueling accidents significantly damage the engines of both gasoline and diesel vehicles, and should be avoided by rapid and accurate fuel discrimination. Gasoline fuel contains bioethanol. Thus, the detection of ethanol vapor produced by gasoline can be used to distinguish between gasoline and diesel. In the present study, Pt-doped SnO2 hollow nanospheres, Mg-doped In2O3 hollow microspheres, and Pt-doped ZnO nanostructures have been used as gas sensors to discriminate between gasoline and diesel fuels. All three sensors are able to detect and discriminate between gases evaporating from gasoline and diesel. Among the sensors, the Mg-doped In2O3 hollow microspheres show a significant gas response (resistance ratio = 4.97) quickly (~3 s) after exposure to gasoline-evaporated gas at 225℃, but did not show any substantial response to diesel-evaporated gas. This demonstrates that gasoline and diesel fuels can be discriminated using small and cost-effective oxide semiconductor gas sensors.

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4Comparative Analysis of Indoor Mixture Gas Patterns and Reference Single Gas Patterns Obtained from E-Nose for Indoor Air Quality Monitoring

저자 : Jang Sik Choi , Joon Boo Yu , Jin Young Jeon , Sang Hun Lee ,

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 4호 발행 연도 : 2018 페이지 : pp. 227-231 (5 pages)

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Indoor air pollution has become a serious issue, affecting the health and comfort of building occupants. Volatile organic compounds (VOCs) are among the most common indoor contaminants, and are released from numerous indoor emission sources. Among the VOCs, formaldehyde and toluene are toxic chemicals at low levels and are frequently detected indoors. Exposure to formaldehyde and toluene can irritate sensitive tissue and may increase the risk of cancer. Therefore, monitoring formaldehyde and toluene is critical for the health and comfort of residents. In addition, as human indoor activities can generate VOC gases, analysis of their influence on VOCs is needed. In this study, we compared electronic nose (E-Nose) data for formaldehyde and toluene with E-Nose data for indoor mixture gas with consideration for human indoor activities.

KCI후보

5방류수의 방사능 오염 측정을 위한 배열형 SiPM 기반 방사선 검출 센서 제작

저자 : 김정호 ( Jeongho Kim ) , 박혜민 ( Hyemin Park ) , 주관식 ( Koansik Joo )

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 4호 발행 연도 : 2018 페이지 : pp. 232-236 (5 pages)

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A radiation detection sensor was developed and characterized by combining three types of CsI(Tl) scintillators and an array-type SiPM to detect the radioactive contamination of discharged water in real time. The characterization results showed that type 3 exhibited the most desirable characteristics in response linearity (R-square: 0.97889) according to detection sensitivity and incident radiation dose. Furthermore, in terms of spectral characteristics, type 3 exhibited 16.54% at 0.356 MeV (the emission gamma ray energy of 133Ba), 10.28% at 0.511 MeV (the emission gamma ray energy of 22Na), 9.68% at 0.356 MeV (the emission gamma ray energy of 137Cs), and 2.55% and 4.80% at 1.173 MeV and 1.332 MeV (the emission gamma ray energies of 60Co), respectively. These measurements confirmed the good energy characteristics. The results were used to evaluate the spectral characteristics and energy linearity in a mixed source using type 3 with the best detection characteristics. It was confirmed that the gamma ray peaks of 133Ba, 22Na, 137Cs, and 60Co were well resolved. Moreover, it was confirmed that R-square, which is an indicator of energy linearity, was 0.99986. This indicates a good linearity characteristic. Based on this study, further commercialization studies will contribute to measurements in real time and to the management of the contamination caused by radioactive wastewater or radioactive material leakage, which originate from facilities that use radioactive isotopes or care facilities.

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6Concanavalin A가 코팅 된 자성 입자를 이용한 미생물 농축 및 유전자 추출 칩 개발

저자 : 권기록 ( Kirok Kwon ) , 곽호경 ( Hogyeong Gwak ) , 현경아 ( Kyung-a Hyun ) , 정효일 ( Hyo-il

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 4호 발행 연도 : 2018 페이지 : pp. 237-241 (5 pages)

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The real-time enrichment and detection of pathogens are serious issues and rapidly evolving field of research because of the ability of these pathogens to cause infectious diseases. In general, bacterial detection is accomplished by conventional colony counting or by polymerase chain reaction (PCR) after DNA extraction. As colony counting requires considerable time to cultivate, PCR is an attractive method for rapid detection. A small number of pathogens can cause diseases. Hence, a pretreatment process, such as enrichment is essential for detecting bacteria in an actual environment. Thus, in this study, we developed a microfluidic chip capable of performing rapid enrichment of bacteria and the extraction of their genes. A lectin, i.e., Concanavalin A (ConA), which shows binding affinity to the surface of most bacteria, was coated on the surface of magnetic particles to nonspecifically capture bacteria. It was subsequently concentrated through magnetic forces in a microfluidic channel. To lyse the captured bacteria, magnetic particles were irradiated by a wavelength of 532nm. The photo-thermal effect on the particles was sufficient for extracting DNA, which was consequently utilized for the identification of bacteria. Our device will help monitor the existence of bacteria in various environmental situations such as water, air, and soil.

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7정적 자전거 피팅에 적용 가능한 체중 분포 측정장치의 구현

저자 : 윤선호 ( Seon-ho Yoon ) , 권준혁 ( Jun-hyuk Kwon ) , 김청월 ( Cheong-worl Kim )

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 4호 발행 연도 : 2018 페이지 : pp. 242-248 (7 pages)

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Bicycle fittings have been used to ride bicycles comfortably while minimizing non-traumatic injuries. To analyze the cause of nontraumatic injuries, it is necessary to measure the body weight distribution in various biking positions. In this study, a weight distribution measurement system was implemented by installing five weighable devices on the saddle, both pedals, and both handle grips of a bicycle. To measure the body weight applied through the saddle, the structure of a commercial seat post was modified and a load cell was installed inside. Weighable pedals and handle grips were designed using a 3D modeling program and fabricated by employing a 3D printer. The body weight distribution for ten bicycle riders was measured when the two pedals were aligned horizontally and vertically. Experimental results showed that the body weight distribution varied significantly depending on human body shape, even after the bicycle fitting was completed. The difference between the body weight measured by the proposed system and a commercial scale was less than 3%.

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8소결온도에 의한 중적외선 투과용 ZnS 세라믹스의 광학적 특성

저자 : 여서영 ( Seo-yeong Yeo ) , 권태형 ( Tae-hyeong Kwon ) , 김창일 ( Chang-il Kim ) , 백종후 ( J

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 4호 발행 연도 : 2018 페이지 : pp. 249-253 (5 pages)

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Infrared transparent ZnS ceramics were synthesized through hydrothermal synthesis (180℃, 70 h) and sintered using a hot press process at 750℃-1000℃. We carried out x-ray diffraction, scanning electron microscopy, and Fourier transform-infrared spectroscopy to confirm the optical properties of the ZnS ceramics after sintering at various temperatures. The phase of ZnS nanopowders was a single phase (cubic) without the hexagonal phase. However, as sintering temperature increased, the formation and increment of hexagonal structures was confirmed. The ZnS ceramic sintered at a temperature of 750℃ showed poor transmittance because it was not completely sintered and because of the pore effect. The ZnS ceramic with the highest transmittance (approximately 69%) was sintered at 800℃. As sintering temperature increased, transmittance gradually decreased owing to the increase in the formation of the hexagonal phase.

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9진동신호 무선 수집에 대한 연구

저자 : 이선표 ( Sunpyo Lee )

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 4호 발행 연도 : 2018 페이지 : pp. 254-258 (5 pages)

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A Wi-Fi signal network (WSN) system is introduced in this paper. This system consists of several data-transmitting sensor modules and a data-receiving server. Each sensor module and the server contain a unique intranet IP address. A piezoelectric accelerometer with a bandwidth of 12 kHz, a 24-bit analog-digital converter with a sampling rate of 15.625 kS/s, a 32-bit microprocessor unit, and a 1-Mbps Wi-Fi module are used in the data-transmitting sensor module. A 300-Mbps router and a PC are used in the server. The system is verified using an accelerometer calibrator. The voltage output from the sensor is converted into 24-bit digital data and transmitted via the Wi-Fi module. These data are received by a Wi-Fi router connected to a PC. The input frequencies of the accelerometer calibrator (320 Hz, 640 Hz, and 1280 Hz) are used in the data transfer verification. The received data are compared to the data retrieved directly from the analog-to-digital converter used in the sensor module. The comparison shows that the developed system represents the original data considerably well. Theoretically, the system can acquire vibration signals from 600 sensor modules at an accelerometer bandwidth of 15.625 kHz. However, delay exists owing to software processes, multiplexing between sensor modules, and the use of non-real time operating system. Hence, it is recommended that this system may be used to acquire vibration signals with up to 10 kHz, which is approximately 70% of the theoretical maximum speed of the system. The system can be upgraded using parts with higher performance

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10토노메트리 방식 맥파 측정의 가압 각도와 가압력에 따른 AIx 변화

저자 : 조정희 ( Junghee Cho ) , 전영주 ( Young Ju Jeon ) , 전민호 ( Min-ho Jun ) , 김영민 ( Young-m

발행기관 : 한국센서학회 간행물 : 센서학회지 27권 4호 발행 연도 : 2018 페이지 : pp. 259-263 (5 pages)

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A radial artery pulse wave is measured while pressing an artery with constant force. However, pulse waveform measurements vary depending on pressing force and direction. Accurate pulse waveform measurements are important for analysis. Thus, it is necessary to define the measurement range of the permissible force and direction from which a correct pulse waveform is derived. In this study, pulse waves were generated by a pulse wave generator for accurate control. The pulse waves generated for different angles and pressing forces were analyzed. The augmentation index (AIx), which is the most commonly used index for evaluating vascular stiffness, was analyzed. The AIx was measured within ± 6° of the vessel direction and within ± 8° perpendicular to the vessel direction with a force that was 25% or more of the pressing force at which the maximum pressure wave was generated. We identified the applicable pressing force and angle range by analyzing the effect of pressing angle on the pulse wave. The AIx analysis performed using the pulse wave measurement device is reliable and reproducible.

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(2006)홍길동 외 1명심리학41회 피인용

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