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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Sensor Science and Technology
Journal Basic Information
Journal DOI :
The Korean Sensors Society
Editor in Chief :
Volume & Issues
Volume 22, Issue 6 - Nov 2013
Volume 22, Issue 5 - Sep 2013
Volume 22, Issue 4 - Jul 2013
Volume 22, Issue 3 - May 2013
Volume 22, Issue 2 - Mar 2013
Volume 22, Issue 1 - Jan 2013
Selecting the target year
Load Resistance Influence of Magnetoelectric Characteristics on NiZnFe
+PZT Composites for Magnetoelectric Sensors
Ryu, Ji-Goo ; Chung, Su-Tae ;
Journal of Sensor Science and Technology , volume 22, issue 6, 2013, Pages 379~386
DOI : 10.5369/JSST.2013.22.6.379
The influences of the load resistance
on the magnetoelectric (ME) characteristics of
composite were investigated in the non-resonance frequency range. The ME coefficient peak increases with increasing
, but the frequency indicating the ME coefficient peak decreases with increasing
. The maximum output power peak is approximately
at f=280 Hz, and the ME coefficient seems to be saturated at
. This frequency shift effect of
shows that the frequency range for an ME sensor application can be modulated with the appropriate value of
. The ME output voltage has a good linear response to the ac field Hac and shows fair stability over a range of temperatures. The measured non-linearity of this sample is approximately 0.8%. This sample will allow for a low-strength magnetic ac-field sensor. The result from this sample will serve as basic data for a signal-processing circuit system.
Capturing Distance Parameters Using a Laser Sensor in a Stereoscopic 3D Camera Rig System
Chung, Wan-Young ; Ilham, Julian ; Kim, Jong-Jin ;
Journal of Sensor Science and Technology , volume 22, issue 6, 2013, Pages 387~392
DOI : 10.5369/JSST.2013.22.6.387
Camera rigs for shooting 3D video are classified as manual, motorized, or fully automatic. Even in an automatic camera rig, the process of Stereoscopic 3D (S3D) video capture is very complex and time-consuming. One of the key time-consuming operations is capturing the distance parameters, which are near distance, far distance, and convergence distance. Traditionally these distances are measured by tape measure or triangular indirect measurement methods. These two methods consume a long time for every scene in shot. In our study, a compact laser distance sensing system with long range distance sensitivity is developed. The system is small enough to be installed on top of a camera and the measuring accuracy is within 2% even at a range of 50 m. The shooting time of an automatic camera rig equipped with the laser distance sensing system can be reduced significantly to less than a minute.
Estimation of Rotation of Camera Direction and Distance Between Two Camera Positions by Using Fisheye Lens System
Aregawi, Tewodros A. ; Kwon, Oh-Yeol ; Park, Soon-Yong ; Chien, Sung-Il ;
Journal of Sensor Science and Technology , volume 22, issue 6, 2013, Pages 393~399
DOI : 10.5369/JSST.2013.22.6.393
We propose a method of sensing the rotation and distance of a camera by using a fisheye lens system as a vision sensor. We estimate the rotation angle of a camera with a modified correlation method by clipping similar regions to avoid symmetry problems and suppressing highlight areas. In order to eliminate the rectification process of the distorted points of a fisheye lens image, we introduce an offline process using the normalized focal length, which does not require the image sensor size. We also formulate an equation for calculating the distance of a camera movement by matching the feature points of the test image with those of the reference image.
Development of Stretchable PZT/PDMS Nanocomposite Film with CNT Electrode
Yun, Ji Sun ; Jeong, Young Hun ; Nam, Joong-Hee ; Cho, Jeong-Ho ; Paik, Jong-Hoo ;
Journal of Sensor Science and Technology , volume 22, issue 6, 2013, Pages 400~403
DOI : 10.5369/JSST.2013.22.6.400
The piezoelectric composite film of ferroelectric PZT ceramic (
) and polymer (PDMS, Polydimethylsiloxane) was prepared to improve the flexibility of piezoelectric material. The bar coating method was applied to fabricate flexible nanocomposite film with large surface area by low cost process. In the case of using metal electrode on the composite film, although there is no problem by bending process, the electrode is usually broken away from the film by stretching process. However, the well-attached, flexible CNT electrode on PZT/PDMS film improved flexibility, especially stretchability. PZT particles was usually settled down into polymer matrix due to gravity of the weighty particle, so to improve the dispersion of PZT powder in polymer matrix, small amount of additives (CNT powder, Carbon nanotube powder) was physically mixed with the matrix. By stretching the film, an output voltage of PZT(70 wt%)/PDMS with CNT (0.5 wt%) was measured.
Calibration by Comparison and Uncertainty Assessment of Industrial Thermometers at the Boiling Point of Nitrogen
Yang, Inseok ; Gam, Kee Sool ; Joung, Wukchul ; Kim, Yong-Gyoo ;
Journal of Sensor Science and Technology , volume 22, issue 6, 2013, Pages 404~409
DOI : 10.5369/JSST.2013.22.6.404
We devised calibration procedure for industrial thermometers by a comparison method at the boiling point of nitrogen (
). The uncertainty of the calibration was 4 mK (k = 2). As experimentally demonstrated in this work, the effect of the atmospheric pressure on the boiling point of nitrogen can be easily detected by the thermometer. Therefore, when the boiling point of nitrogen is used for calibration of thermometer by comparison, either a reference thermometer must be used to provide the reference temperature or the effect of atmospheric pressure should be carefully considered. The use of a copper block with a large thermal mass soaked into the liquid nitrogen was proven to be more reliable, and the stability of the temperature immersed into the copper block was 1.4 mK. The temperatures at the thermometer wells, evaluated by the crossed-measurement method to compensate for the inaccuracy of the thermometers and the linear drift of the temperature of the copper block, were equivalent within 0.23 mK of standard uncertainty.
An Implementation of a GPIAS Measurement System for Animal Tinnitus Detection and Study on Effect of Starting Point of Stimulus Background Sound on Startle Response
Jeon, Poram ; Jung, Jae Yun ; Lee, Seung-Ha ; Park, Ilyong ;
Journal of Sensor Science and Technology , volume 22, issue 6, 2013, Pages 410~414
DOI : 10.5369/JSST.2013.22.6.410
As one of the effective methods for researching the objective tinnitus detection, the GPIAS (Gap Pre-pulse Inhibition of Acoustic Startle) measurement has been used to verify the existence of animal tinnitus objectively. The level and pattern of the background sound presented prior to a startle pulse are closely related with the GPIAS results. But the effect of the starting point of the background sound on animal startle responses has not been reported yet. In this paper, we present the implementation of a GPIAS measurement system based on an unconstrained enclosure to avoid animals' excessive constraint stress and deal with the animals' growth. After the performance of our implemented system has been tested through the animal experiment using 4 SD-rats, the effect of starting point of stimulus background sound on the startle response has been studied by the use of our implemented system. Through the results, it is verified that our system can measure the inhibition of animal startle responses due the gap pre-pulse for GPIAS calculation and the background sound starting point does not significantly effect on the startle response and the GPIAS values if the background sound continues for more than 300msec before a gap pre-pulse is presented.
Performance Assessment on Temperature Calibration Capability of the Calibration Laboratories Using High-Precision Platinum Resistance Thermometers
Gam, Kee Sool ; Lee, Young Hee ; Yang, Inseok ;
Journal of Sensor Science and Technology , volume 22, issue 6, 2013, Pages 415~420
DOI : 10.5369/JSST.2013.22.6.415
Calibration capabilities for thermometer calibration by comparison method were assessed using high-precision industrial platinum resistance thermometers (IPRT). It was found in the performance assessment that out of 31 laboratories who participated, 28 laboratories resulted magnitude of En number less than 1 at every calibration points they submitted results in the range from 50 to
. The results of about 75% of the laboratories showed the difference from the assigned values less than 1/10 of the tolerance level of the class B IPRT. This indicates that the participating calibration laboratories performed with satisfactory level that was enough to calibrate IPRTs to significant precision. The sensors used in this work were manufactured and chosen by the criteria of long-term instability less than 4 mK and hysteresis less than 8 mK in the temperature range used in this work. Furthermore, the change in the resistance of the sensors in the calibration temperature range were less than the uncertainty of the calibration, 25 mK (k=2).
Synchronous Visible Light Communication Systems Using 3-Level LED Modulation
Lee, Seong-Ho ;
Journal of Sensor Science and Technology , volume 22, issue 6, 2013, Pages 421~427
DOI : 10.5369/JSST.2013.22.6.421
In this paper, we introduce a new synchronous visible light communication system in which the synchronizing pulse and the data bits are simultaneously transmitted using a 3-level light signal. In the transmitter, the synchronizing pulse and the data bits modulate independently two identical visible LEDs, whose output lights add in free space, make 3-level optical signal. In the receiver, a photodiode detects the light and generates a 3-level output voltage, whose positive and negative part correspond to the synchronizing pulse and the data bits, respectively. The two signals are easily separated and recovered by a simple diode circuit. This configuration provides two independent VLC channels without any multiplexing technique, simplifies the circuit design and construction of synchronous VLC systems.
Performance Improvement of Peristaltic Micropump Using Various Actuating Signal
Hong, Pyo-Hwan ; Jung, Dong-Geon ; Pyo, Dae-Seong ; Lee, Jong-Hyun ; Cho, Chan-Seob ; Kim, Bonghwan ;
Journal of Sensor Science and Technology , volume 22, issue 6, 2013, Pages 428~432
DOI : 10.5369/JSST.2013.22.6.428
This paper described the development of electrostatically driven peristaltic micropump. The proposed micropump consists of a flexible membrane and a single chamber which electrodes are inserted. The single chamber is divided into smaller cells by the electrodes. The fabricated micropump was operated with four electrodes in the membrane and a various phase sequencing actuation. We studied the changes in the flow rate corresponding to the actuating signal applied to the micropump under the zero hydraulic pressure difference between lnlet port and outlet port. The pump was operated from 60 to 130 V. Whereas the maximum flow rate in basic actuating signal is about 83
at 15 Hz, the maximum flow rate in optimized actuating signal is about 114
at 10 Hz.
Pyramid and Half-Sphere Type of Surface Texturing for Si-Solar Cell
Pyo, Dae-Seong ; Jo, Jun-Hwan ; Hong, Pyo-Hwan ; Lee, Jong-Hyun ; Kim, Bonghwan ; Cho, Chan-Seob ;
Journal of Sensor Science and Technology , volume 22, issue 6, 2013, Pages 433~438
DOI : 10.5369/JSST.2013.22.6.433
In this paper, we found surface shapes are affected by several parameters of RIE, such as RF power, pressure, temp, and process times. The reflectance of pyramid and half sphere structures show differences among shapes, size, height, and depth of those structures. We made about
pyramid and half sphere shapes of silicon surface with RIE. For comparing the reflectance, pyramid and half sphere structures are fabricated with same height. Pyramid structure cell shows higher cell efficiency of 12.5% by 1.1% than one of half sphere structure of 11.4%. The light absorption is more increased through the pyramid structure than half sphere structure.
Wireless Optical Fiber Interferometer Arterial Pulse Wave Sensor System
Park, Jaehee ; Shin, Jong-Dug ;
Journal of Sensor Science and Technology , volume 22, issue 6, 2013, Pages 439~443
DOI : 10.5369/JSST.2013.22.6.439
A wireless optical fiber interferometer arterial pulse wave sensor system is developed for remote sensing. The wireless optical fiber sensor system consists of Zigbee communication modules and an optical fiber interferometer arterial pulse wave sensor. The optical fiber arterial pulse wave sensor is an in-line Michelson interferometer enclosed with steel reinforcement in a heat-shrinkable tube. The Zigbee communication modules are composed of an ATmega128L microprocessor and a CC2420 Zigbee chip. The arterial pulse waves detected by the optical fiber sensor were transmitted and received via the Zigbee communication modules. The experimental results show that the wireless optical fiber sensor system can be used for monitoring the arterial pulse waves remotely.
ZnO-based Ethanol Gas Sensor
Choi, Dong-Han ;
Journal of Sensor Science and Technology , volume 22, issue 6, 2013, Pages 444~449
DOI : 10.5369/JSST.2013.22.6.444
ZnO-based ethanol gas sensors were fabricated by the painting method and their electrical and ethanol gas sensing characteristics were investigated. The ZnO-Pt (1 wt.%) film heat treated at
, for 2 hrs. in air showed the highest sensitivity to ethanol gas in air at an operating temperature of
The sensitivity of the gas sensors to 1000 ppm ethanol in air at
was 8.7 and rising time and falling time of the gas sensors were 3.12 minutes and 25 minutes, respectively.