Go to the main menu
Skip to content
Go to bottom
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 20, Issue 6 - Nov 2011
Volume 20, Issue 5 - Sep 2011
Volume 20, Issue 4 - Jul 2011
Volume 20, Issue 3 - May 2011
Volume 20, Issue 2 - Mar 2011
Volume 20, Issue 1 - Jan 2011
Selecting the target year
Bioimpedance Changes in Rats with CCl
-Induced Liver Fibrosis
Heo, Jeong ; Jung, Dong-Keun ;
Journal of Sensor Science and Technology , volume 20, issue 2, 2011, Pages 71~76
DOI : 10.5369/JSST.2011.20.2.71
To characterize the relationship between the stage of hepatic fibrosis and bioimpedance, several electric parameters were estimated in rats with
-induced liver fibrosis. Thirty three Sprague-Dawley rats were intraperitoneally injected with a
-mineral oil mixture (1:1, 0.2 mL/100 g) twice a week for 8 weeks. The resistance(R), reactance(X), impedance(Z), and dissipation factor(D) between 1 kHz and 100 kHz were then evaluated in the livers of the rats under pentobarbital anesthesia using an HP4294A Impedance Analyzer. The rats were killed 2, 4, 6, and 8 weeks later, and their livers were classified in accordance with Ishak's scoring system. R, X, and Z changed in accordance with the progression of hepatic fibrosis and the changes were greater at lower frequencies than at higher frequencies. In comparison, the D spectrum was biphasic; D increased initially then decreased with increasing frequency. All of the parameters(R, X, Z, and D) changed in accordance with the stage of fibrosis in the livers, but D changed specifically with the progression of fibrosis. These results indicate that hepatic fibrosis may be evaluated by determining the changes in D.
A Single-Pole, Eight-Throw, Radio-Frequency, MicroElectroMechanical Systems Switch for Multi-Band / Multi-Mode Front-End Module
Kang, Sung-Chan ; Kim, Hyeon-Cheol ; Chun, Kuk-Jin ;
Journal of Sensor Science and Technology , volume 20, issue 2, 2011, Pages 77~81
DOI : 10.5369/JSST.2011.20.2.77
This paper presents a single-pole eight-throw(SP8T) switch based on proposed a radio-frequency(RF) microelectromechanical systems (MEMS) switches. The proposed switch was driven by a double stop(DS) comb drive, with a lateral resistive contact. Additionally, the proposed switch was designed to have tapered signal line and bi-directionally actuated. A forward actuation connects between signal lines and contact part, and the output becomes on-state. A reverse actuation connects between ground lines and contact part, and the output becomes off-state. The SP8T switch of 3-stage tree topology was developed based on an arrangement of the proposed RF MEMS switches. The developed SP8T switch had an actuation voltage of 12 V, an insertion loss of 1.3 dB, a return loss of 15.1 dB, and an isolation of 31.4 dB at 6 GHz.
Synthesis and Characterization of Ruthenium Doped TiO
Park, Jung-Yeon ; Lee, Deuk-Yong ; Cho, Nam-Ihn ; Oh, Young-Jei ;
Journal of Sensor Science and Technology , volume 20, issue 2, 2011, Pages 82~89
DOI : 10.5369/JSST.2011.20.2.82
nanofibers were prepared using electrospun Ru-
/poly(vinyl acetate) (PVAc) fibers and subsequent annealing for 1 h at temperatures in the range of
in air. The properties of the Ru-
fibers were characterized as a function of the Ru content and calcination temperature using X-ray diffraction, thermal gravimetry with differential scanning calorimetry, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, and viscometer, pycnometer and dynamic tensiometer measurements. Although the diameter of the fiber decreased slightly with increasing calcination temperature, no dramatic changes were observed with respect to the ruthenium content. The XRD and FT-IR results revealed that anatase phase and ruthenium metal began to be formed after calcination at temperatures above
. Anatase and rutile phases and ruthenium metal coexisted in the fibers calcined above
. No anatase phase was detected in the fibers containing ruthenium when they were calcined at
. The morphology of the fibers changed from smooth and uniform to porous with increasing temperature. The experimental results suggest that the calcination temperature and Ru content were influential in determining the morphology and structure of the fibers.
Detection of Protein Molecules by Electrical Current Response Using Two-Electrode Method
Lyu, Hong-Kun ; Woo, Sung-Ho ; Han, Yoon-Soo ; Lee, Hee-Ho ; Shin, Jang-Kyoo ;
Journal of Sensor Science and Technology , volume 20, issue 2, 2011, Pages 90~95
DOI : 10.5369/JSST.2011.20.2.90
In order to protect human lives from disease, various biosensors having the potential to analyze a variety of biomolecules have been utilized. Biosensors constitute one of the most promising ways to monitor and detect various biomolecules corresponding to diseases. In this study, we demonstrate that the reaction of streptavidin molecules with biotin on a gold electrode can be detected using the twoelectrode method with a gold electrode and a platinum reference electrode. We also show the characteristics of the electrical current response. While detecting 2-
streptavidin molecules dissolved in phosphate buffered saline(PBS) solution, we found that an analytical biosensor can operate on the principle of detecting an antigen-antibody reaction event of protein molecules using the two-electrode method. We think that the "potential step" method might be useful to detect the occurrence of any antigen-antibody reactions and can be combined with other devices or ICs such as BJTs, MOSFETs, and OP-amps for the detection of biomolecules of diseases.
Measurement of Relative Depth dose of Therapeutic Photon Beam Using One-Dimensional Fiber-Optic Phantom Dosimeter
Moon, Jin-Soo ; Jang, Kyoung-Won ; Yoo, Wook-Jae ; Seo, Jeong-Ki ; Park, Jang-Yeon ; Cho, Young-Ho ; Lee, Bong-Soo ;
Journal of Sensor Science and Technology , volume 20, issue 2, 2011, Pages 96~101
DOI : 10.5369/JSST.2011.20.2.96
In this study, we fabricated a fiber-optic phantom dosimeter by arraying square type of plastic optical fibers in a PMMA phantom for measuring relative depth doses of therapeutic photon beams. To minimize the cross-talk between fiber-optic dosimeters, we selected appropriate septum by measuring leaked scintillating lights according to the various kinds of septa. In addition, we measured percentage depth doses of 6, 15 MV photon beams using a fiber-optic phantom dosimeter.
Design and Analyses of Vibration Driven Electromagnetic Energy Harvester with High Power Generation at Low Frequency
Lee, Byung-Chul ; Chung, Gwiy-Sang ;
Journal of Sensor Science and Technology , volume 20, issue 2, 2011, Pages 102~106
DOI : 10.5369/JSST.2011.20.2.102
This paper presents a design and analysis of an electromagnetic micro generator which can convert low frequency vibration energy to electrical power. The design aspects of the micro generator comprised planar spring, Cu coil and a permanent magnet(NdFeB). Threetype spring designs and four materials(Parylene, FR-4, Cu and Si) were compared to find resonance frequency. It was found that the resonance frequency will be changed according to the spring shape and material. Mechanical and magnetic parameters had been adjusted to optimize the output power through a comprehensive theoretical study.
The Method of Measurement Signal Processing of Biosensor Based on Optical Fiber Using Reflected Localized Surface Plasmon Resonance
Jeong, Hyeon-Ho ; Lee, Seung-Ki ;
Journal of Sensor Science and Technology , volume 20, issue 2, 2011, Pages 107~113
DOI : 10.5369/JSST.2011.20.2.107
LSPR(Localized Surface Plasmon Resonance) sensor measures the refractive index change on the sensor surface. The detection of biological reaction with the unknown refractive index needs to be converted into the signal sensitivity for the refractive index change for comparison with other measurements. To find the signal sensitivity, the three steps of signal processing are proposed, which are signal modeling, signal calibration and signal normalization of LSPR sensor. The detected signal of biotin-streptavidin interaction has been converted into unit of [RU](Resonance Unit) using the proposed method. The converted signal directly can be compared with the other sensors including commercialized one.
Effect of P(VDF/TrFE) Film Thickness on the Characteristics of Pyroelectric Passive Infrared Ray Sensor for Human Body Detection
Kwon, Sung-Yeol ;
Journal of Sensor Science and Technology , volume 20, issue 2, 2011, Pages 114~117
DOI : 10.5369/JSST.2011.20.2.114
A thick 25
thickness poled P(VDF/TrFE) film pyroelectric infrared ray sensor has been fabricated and then thin 1.6
thickness P(VDF/TrFE) film pyroelectric infrared ray sensor has been fabricated also. These thick and thin P(VDF/TrFE) film pyroelectric infrared ray sensor was mounted in TO-5 housing to detect infrared light of 5.5 ~ 14
wavelength for human body detecting with each other. The noise output voltage of the thick P(VDF/TrFE) film pyroelectric infrared ray sensor were 380 mV and NEP(noise equivalent power) is
W which is the similar value with the commercial pyroelectric infrared ray sensor using ceramic materials as a sensing material. The NEP and specific detectivity
of the thin P(VDF/TrFE) film pyroelectric infrared ray sensor were
cm/W under emission energy of 13
respectively. These result caused by lower thermal diffusion coefficient of a thin 1.6
thickness PVDF/TrFE film than the thick 25
thickness poled P(VDF/TrFE) film pyroelectric infrared ray sensor.
Basic Study for Stress Analysis Using an Unconstrained BCG Monitoring System
Noh, Yun-Hong ; Jeong, Do-Un ;
Journal of Sensor Science and Technology , volume 20, issue 2, 2011, Pages 118~123
DOI : 10.5369/JSST.2011.20.2.118
Heart related diseases mainly caused by heavy work load and increasing stress in human daily life. Therefore, researches on mobile healthcare monitoring for daily life has been carried out. Notably, wearable healthcare monitoring system which has least restriction has been tried to provide an emergency alert of abnormal heart rate. In this study, we developed chair type unconstrained BCG measurement system which able to perform continuous heart status monitoring at the office and daily life in the unconstrained way. Furthermore, adaptive threshold is used to detect the heart rate from BCG signals. The HRV(heart rate variability) is calculated from heart rate interval. ECG signal measured using conventional method and BCG signal measured using unconstraint system are carried out simultaneously for the purpose of performance evaluation. From the comparison result, BCG signal shows a similar heart beat characteristic as ECG signal. This proves the possibility of practical implementation of unconstraint healthcare monitoring system. In addition, medical examination like valsalva maneuver is performed to observe the changes in HRV due to stress. By performing valsalva maneuver, heart is said to be placed under an artificial physical stress condition. Under this artificial physical stress condition, the time and frequency domain of HRV parameters are evaluated.
Ultrasonic Cavitation Effect Observation Using Bubble Cloud Image Analysis
Noh, Si-Cheol ; Kim, Ju-Young ; Kim, Jin-Su ; Kang, Jung-Hoon ; Choi, Heung-Ho ;
Journal of Sensor Science and Technology , volume 20, issue 2, 2011, Pages 124~130
DOI : 10.5369/JSST.2011.20.2.124
In this study, in order to evaluate the yield of bubble by ultrasonic cavitation in HIFU sonication, the bubble image analysis was performed. The changing phenomenon of cavitation effect according to the sonication condition was discussed by analyzing the bubble image. Especially the appearance of bubble cloud, the size of micro-bubble, and the yield of bubble were considered. The 500 KHz and 1.1 MHz concave type ultrasonic transducers were used for HIFU sonication. Computer controlled digital camera was used to obtain the bubble image, and the binary image processing(binarization coefficient : 0.15) was performed to analyze them. In results of 500 KHz and 1.1 MHz transducer, the area of bubble cloud was increased in proportion to the rise in sonication intensity(
: 0.7031 and 0.811). The mean size of single microbubble was measured as 98.18 um in 500 KHz sonication, and 63.38 um in 1.1 MHz sonication. In addition, the amount of produced bubble was increased in proportion to sonication intensity. Through the result of this study and further study for variable image processing method, the quantitative evaluation of ultrasonic cavitation effects in HIFU operation could be possible with the linearity associated with the sonication conditions.
Wireless Vibration Measurement System Using a 3-Axial Accelerometer Sensor
Yoo, Ju-Yeon ; Park, Geun-Chul ; Jeon, Ah-Young ; Kim, Cheol-Han ; Kim, Yun-Jin ; Ro, Jung-Hoon ; Jeon, Gye-Rok ;
Journal of Sensor Science and Technology , volume 20, issue 2, 2011, Pages 131~136
DOI : 10.5369/JSST.2011.20.2.131
In this study, a compact wireless vibration measurement system was developed using a 3-axial accelerometer in order to evaluate the vibration stimulation system. A low power microprocessor chip integrated with 2.4 GHz RF transceiver was used for the wireless data communication. To evaluate the system, the frequencies and accelerations from the vibration stimulation system were measured using an LVDT sensor and a vibration measurement system. The average frequency difference by the measurement system was less than 0.1 Hz, and the standard deviation of frequencies estimated by the LVDT sensor and the accelerometer was below 0.08 Hz. The developed system was applied to access a vibration stimulation system for the future study. The average acceleration difference of the central and peripheral point of the stimulation system was less than 0.0005 g(1 g=9.8
), and the standard deviation of the acceleration was below 0.004 g, which shows the usefulness of the wireless vibration measurement system.
A Research for Removing ECG Noise and Transmitting 1-channel of 3-axis Accelerometer Signal in Wearable Sensor Node Based on WSN
Lee, Seung-Chul ; Chung, Wan-Young ;
Journal of Sensor Science and Technology , volume 20, issue 2, 2011, Pages 137~144
DOI : 10.5369/JSST.2011.20.2.137
Wireless sensor network(WSN) has the potential to greatly effect many aspects of u-healthcare. By outfitting the potential with WSN, wearable sensor node can collects real-time data on physiological status and transmits through base station to server PC. However, there is a significant gap between WSN and healthcare. WSN has the limited resource about computing capability and data transmission according to bio-sensor sampling rates and channels to apply healthcare system. If a wearable node transmits ECG and accelerometer data of 4 channel sampled at 100 Hz, these data may occur high loss packets for transmitting human activity and ECG to server PC. Therefore current wearable sensor nodes have to solve above mentioned problems to be suited for u-healthcare system. Most WSN based activity and ECG monitoring system have been implemented some algorithms which are applied for signal vector magnitude(SVM) algorithm and ECG noise algorithm in server PC. In this paper, A wearable sensor node using integrated ECG and 3-axial accelerometer based on wireless sensor network is designed and developed. It can form multi-hop network with relay nodes to extend network range in WSN. Our wearable nodes can transmit 1-channel activity data processed activity classification data vector using SVM algorithm to 3-channel accelerometer data. ECG signals are contaminated with high frequency noise such as power line interference and muscle artifact. Our wearable sensor nodes can remove high frequency noise to clear original ECG signal for healthcare monitoring.