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JOURNAL OF SENSOR SCIENCE AND TECHNOLOGY

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수록정보
수록범위 : 1권1호(1992)~28권5호(2019) |수록논문 수 : 1,730
센서학회지
28권5호(2019년 09월) 수록논문
최근 권호 논문
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KCI등재

1Highly Sensitive and Selective Trimethylamine Sensor Using Yolk-shell Structured Mo-doped Co3O4 Spheres

저자 : Tae-hyung Kim , Ki Beom Kim , Jong-heun Lee

발행기관 : 한국센서학회 간행물 : 센서학회지 28권 5호 발행 연도 : 2019 페이지 : pp. 271-276 (6 pages)

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Pure and 0.5, 1, 2, 5, and 10 at% of Mo-doped Co3O4 yolk-shell spheres were synthesized by ultrasonic spray pyrolysis of droplets containing Co nitrate, ammonium molybdate, and sucrose and their gas sensing characteristics to 5 ppm trimethylamine (TMA), ethanol, p-xylene, toluene, ammonia, carbon monoxide, and benzene were measured at 225-325 ℃. The sensor using pure Co3O4 yolk-shell spheres showed the highest response to p-xylene and very low response to TMA at 250 ℃, while the doping of Mo into Co3O4 tended to increase the overall responses of gas sensors. In particular, the sensor using 5 at% Mo-doped Co3O4 yolk-shell spheres exhibited the high response to TMA with low cross-responses to other interfering gases. The high response and selectivity of Mo-doped Co3O4 yolkshell spheres to TMA are attributed to the electronic sensitization by higher valent Mo doping and acid-base interaction between TMA and Mo components.

KCI등재

2Distributed Fusion Estimation for Sensor Network

저자 : Il Young Song , Jin Mo Song , Woong Ji Jeong , Myoung Sool Gong

발행기관 : 한국센서학회 간행물 : 센서학회지 28권 5호 발행 연도 : 2019 페이지 : pp. 277-283 (7 pages)

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In this paper, we propose a distributed fusion estimation for sensor networks using a receding horizon strategy. Communication channels were modelled as Markov jump systems, and a posterior probability distribution for communication channel characteristics was calculated and incorporated into the filter to allow distributed fusion estimation to handle path loss observation situations automatically. To implement distributed fusion estimation, a Kalman-Consensus filter was then used to obtain the average consensus, based on the estimates of sensors randomly distributed across sensor networks. The advantages of the proposed algorithms were then verified using a large-scale sensor network example.

KCI등재

3Design of a Neural Chip for Classifying Iris Flowers based on CMOS Analog Neurons

저자 : Yoon-jin Choi , Eun-min Lee , Hang-geun Jeong

발행기관 : 한국센서학회 간행물 : 센서학회지 28권 5호 발행 연도 : 2019 페이지 : pp. 284-288 (5 pages)

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A calibration-free analog neuron circuit is proposed as a viable alternative to the power hungry digital neuron in implementing a deep neural network. The conventional analog neuron requires calibrations because a voltage-mode link is used between the soma and the synapse, which results in significant uncertainty in terms of current mapping. In this work, a current-mode link is used to establish a robust link between the soma and the synapse against the variations in the process and interconnection impedances. The increased hardware owing to the adoption of the current-mode link is estimated to be manageable because the number of neurons in each layer of the neural network is typically bounded. To demonstrate the utility of the proposed analog neuron, a simple neural network with 4 × 7 × 3 architecture has been designed for classifying iris flowers. The chip is now under fabrication in 0.35 mm CMOS technology. Thus, the proposed true current-mode analog neuron can be a practical option in realizing power-efficient neural networks for edge computing.

KCI등재

4순음 청력검사를 위한 원격진단 모니터링 시스템

저자 : 이강호 ( Kang-ho Lee ) , 권영은 ( Yeong-eun Kwon ) , 권오원 ( Ohwon Kwon )

발행기관 : 한국센서학회 간행물 : 센서학회지 28권 5호 발행 연도 : 2019 페이지 : pp. 289-293 (5 pages)

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This paper presents a remote patient monitoring system for diagnostic pure-tone audiometry. A pure-tone audiometer was developed for basic hearing screening; its performance was evaluated according to international standards in terms of linearity, accuracy, and total harmonic distortion. Pure-tone audiometry has a maximum hearing level of 104.9 dB HL that is comparable with other commercial products. The audiometer shows satisfactory linearity with a deviation of ±0.4 dB, an accuracy of ±0.025%, and a total harmonic distortion (THD) of 0.21%. The remote patient monitoring systems include remote control devices based on wide area network (WAN) connections and an audiometer connected in series. Through experimentation, we successfully performed real-time diagnostic communication without delay in transferring audiometric data. This system is expected to supply domestic equipment in the audiometric market and to improve the quality of life of patients in non-clinical environments.

KCI등재

5펄스 레이저 기반 담수용 미세 플라스틱 실시간 센서 모니터링 시스템 연구

저자 : 한승헌 ( Seung Heon Han ) , 김대근 ( Dae Geun Kim ) , 정행윤 ( Haeng Yun Jung ) , 김선훈 ( Seon Hoon Kim )

발행기관 : 한국센서학회 간행물 : 센서학회지 28권 5호 발행 연도 : 2019 페이지 : pp. 294-298 (5 pages)

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Pulsed laser-based optical sensor monitoring systems for real time microplastic particle counting are proposed and developed in this study. To develop our real time monitoring system, we used a 450 nm pulsed laser and a photomultiplier with very high quantum efficiency. First, we demonstrated that the microplastic particle counting system could detect standard micro bead samples of 100, 250, and 500 μm in river water. We then performed research concerning pulsed laser-based optical spectral sensor systems for real time microplastic monitoring. Additionally, we demonstrated that the real time microplastic remote monitoring system using LoRa communications could detect microplastic in the tap water resource protection area.

KCI등재

6의사소통장애인의 조음치료를 위한 한국형 전자구개도의 구현

저자 : 우승탁 ( Seong Tak Woo ) , 박영빈 ( Young Bin Park ) , 오다희 ( Da Hee Oh ) , 하지완 ( Ji-wan Ha )

발행기관 : 한국센서학회 간행물 : 센서학회지 28권 5호 발행 연도 : 2019 페이지 : pp. 299-304 (6 pages)

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Recently, the development of rehabilitation medical technology has resulted in an increased interest in speech therapy equipment. In particular, research on articulation therapy for communication disorders is being actively conducted. Existing methods for the diagnosis and treatment of speech disorders have many limitations, such as traditional tactile perception tests and methods based on empirical judgment of speech therapists. Moreover, the position and tension of the tongue are key factors of speech disorders with regards to articulation. This is a very important factor in the distinction of Korean characters such as lax, fortis, and aspirated consonants. In this study, we proposed a Korean electropalatography (EPG) system to easily measure and monitor the position and tension of the tongue in articulation treatment and diagnosis. In the proposed EPG system, a sensor was fabricated using an AgCl electrode and biocompatible silicon. Furthermore, the measured signal was analyzed by implementing the bio-signal processing module and monitoring program. In particular, the bio-signal was measured by inserting it into the palatal from an experimental control group. As a result, it was confirmed that it could be applied to clinical treatment in speech therapy.

KCI등재

72 파장 라만 산란을 이용한 비침습적 HbA1c 측정

저자 : 양주란 ( Jooran Yang ) , 김형표 ( Hyungpyo Kim )

발행기관 : 한국센서학회 간행물 : 센서학회지 28권 5호 발행 연도 : 2019 페이지 : pp. 305-310 (6 pages)

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The purpose of this study is to classify the concentration of HbA1c (glycosylated hemoglobin), which is an indicator in the management of accurate blood glucose level in diabetic patients, using a non-invasive optical property measurement method. To measure the optical properties of HbA1c, the optical source uses LEDs and laser diodes of 400 nm in the visible region and 1450 nm in the near-infrared region using thermopile to detect the Raman scattering intensity. An HbA1c control solution was used. As a result, the optical properties of 5% (normal) and 9% (abnormal) HbA1c control solutions showed specificity in which the output values were reversed at 850 nm and 950 nm, respectively. This property was applied to distinguish between normal and abnormal values in diabetes. In addition, considering tissue penetration depths for non-invasive measurements, two wavelengths were determined to be effective in distinguishing the concentrations of HbA1c control solutions at 5%, 7%, and 9%.

KCI등재

8회전기기 실시간 동작상태 모니터링을 위한 자가발전 기반 센서모듈

저자 : 김창일 ( Chang Il Kim ) , 여서영 ( Seo-yeong Yeo ) , 박범근 ( Buem-keun Park ) , 정영훈 ( Young-hun Jeong ) , 백종후 ( Jong Hoo Paik )

발행기관 : 한국센서학회 간행물 : 센서학회지 28권 5호 발행 연도 : 2019 페이지 : pp. 311-317 (7 pages)

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Rotating devices are commonly installed in power plants and factories. This study proposes a self-powered sensor node that is powered by converting the vibration energy of a rotating device into electrical energy. The self-powered sensor consists of a piezoelectric harvester for self-power generation, a rectifier circuit to rectify the AC signal, a sensor unit for measuring the vibration frequency, and a circuit to control the light emitting diode (LED) lighting. The frequency of the vibration source was measured using a piezoelectric-cantilever-type vibration frequency sensor. A green LED was illuminated when the measured frequency was within the normal range. The power generated by the piezoelectric harvester was determined, and the LED operation was assessed in terms of the vibration frequency. The piezoelectric harvester was found to generate a power of 3.061 mW or greater at a vibration acceleration of 1.2 g (1 g = 9.8 m/s2) and vibration frequencies between 117 and 123 Hz. Notably, the power generated was 4.099 mW at 122 Hz. As such, our self-powered sensor node can be used as a module for monitoring rotating devices, because it can convert vibration energy into electrical energy when installed on rotating devices such as air compressors.

KCI등재

9탄환 충격파 측정용 방수 음향센서 개발

저자 : 허신 ( Shin Hur ) , 이덕규 ( Duck-gyu Lee )

발행기관 : 한국센서학회 간행물 : 센서학회지 28권 5호 발행 연도 : 2019 페이지 : pp. 318-322 (5 pages)

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In shooting training, an impact point identification system that uses the impact wave of the bullet to check the impact point in the target plate has been recently used. Acoustic sensors used in these systems must be able to detect shock waves of high sound pressure levels and be both waterproof and dustproof for rainy weather and dusty environments, respectively. In this study, membranes with excellent waterproof, dustproof, and sound transmitting characteristics were selected through a characteristics test; a protection cap was installed to install the selected materials. After coupling the produced protection cap to the acoustic sensor housing, the sensitivity and phase characteristics of the acoustic sensor were checked. Through the waterproof and dustproof test, the performances of its sensitivity and phase characteristics were confirmed. Finally, the normal shockwave of a 5.56 mm diameter bullet was measured using a shockwave detection signal collecting plate equipped with a prototype of the acoustic sensor at a 100m firing range.

KCI등재

10음파위상측정기의 오차 원인에 대한 분석

저자 : 김소희 ( So-hee Kim ) , 이기원 ( Ki-won Lee )

발행기관 : 한국센서학회 간행물 : 센서학회지 28권 5호 발행 연도 : 2019 페이지 : pp. 323-328 (6 pages)

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Recently, a sound wave phase meter (SWPM) that can directly measure the pressure waveform of sound waves in free space has been reported, and the development of educational experimental equipment using this meter is in progress. One of the main advantages of using this meter is that wavelengths can be obtained directly from the crests and troughs of the measured pressure waveforms in space without expensive equipment. However, there are times when the measurement wavelength does not exactly match the actual wavelength value, and the pressure waveform differs from the actual shape. This study was conducted to identify and analyze the causes of such errors occurring in SWPM. As a result, it was found that wavelength errors occur when the propagation direction of sound waves and the measurement direction of SWPM do not coincide. It has also been found that an error in the pressure waveform is generated when the induction and sound wave signal outputs from the SWPM interfere with each other to produce a composite signal. We have shown that we can develop educational experimental equipment by suggesting ways to reduce such errors.

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1연안해역에서 석유오염물질의 세균학적 분해에 관한 연구

(2006)홍길동 외 1명심리학41회 피인용

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(2006)홍길동41회 피인용

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