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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 23, Issue 6 - Nov 2014
Volume 23, Issue 5 - Sep 2014
Volume 23, Issue 4 - Jul 2014
Volume 23, Issue 3 - May 2014
Volume 23, Issue 2 - Mar 2014
Volume 23, Issue 1 - Jan 2014
Selecting the target year
Nerve Agents and Their Detection
Kim, Young Jun ; Huh, Jae Doo ;
Journal of Sensor Science and Technology , volume 23, issue 4, 2014, Pages 217~223
DOI : 10.5369/JSST.2014.23.4.217
Nerve agents are major chemical warfare agents with the "G series" and "V series" being the most widely known because of their lethal effect. Although not conspicuously used in major wars, the potential detrimental impact on modern society had been revealed from the sarin terror attack on Tokyo subway, which affected thousands of people. In this mini-review, major nerve agents of the "G series" and "V series" have been described along with various types of their detection methods. The physical properties and hydrolysis mechanisms of the major nerve agents are discussed since these are important factors to be considered in choosing detection methods, and specifying the procedures for sample preparations in order to enhance detection precision. Various types of extraction methods, including liquid-phase, solid-phase, gas-phase and solid-phase microextraction (SPME), are described. Recent development in the use of gas sensors for detecting nerve agents is also summarized.
Electrocaloric Effect in Pb
Roh, Im-Jun ; Kwon, Beomjin ; Moon, Hi Gyu ; Kim, Jin-Sang ; Kang, Chong-Yun ;
Journal of Sensor Science and Technology , volume 23, issue 4, 2014, Pages 224~228
DOI : 10.5369/JSST.2014.23.4.224
The electrocaloric effect of 9/65/35 PLZT thin film fabricated by the sol-gel method, which has not been studied yet, was investigated for its structural, electrical properties as well as temperature change property. The relaxor ferroelectric property of 9/65/35 PLZT thin film was confirmed by examining its dielectric and electrical properties. The relaxor property can cause a more pronounced electrocaloric effect (ECE) in a wider temperature range than normal ferroelectric film. To avoid errors caused by using an indirect measurement method, the leakage current generated by increasing temperatures was minimized by using the optimal maximum electric field (
) in the thin film. The largest temperature change
(0.23 K) and the electrocaloric strength
(0.68 mkcm/kV), calculated by equations were obtained. The maximum field change
) was in the vicinity of the curie temperature (
Quasi-Distributed Temperature Sensor Based on a V-Grooved Single-Mode Optical Fiber Covered with Ethylene Vinyl Acetate
Kim, Kwang Taek ; Jeong, Seong-Gab ;
Journal of Sensor Science and Technology , volume 23, issue 4, 2014, Pages 229~233
DOI : 10.5369/JSST.2014.23.4.229
In this study, a V-grooved single-mode fiber along with optical time domain reflectometry (OTDR) as a quasi-distributed temperature sensor was investigated. The external medium used to fill the V-groove affects the optical mode. The V-groove was filled with ethylene vinyl acetate (EVA) because its transmittance was sensitive to temperature. The experimental results showed that the optical loss of the sensor varies with temperature, and the sensitivity depends on the depth of the V-groove.
Thick Graphene Embedded Metal Heat Spreader with Enhanced Thermal Conductivity
Park, Minsoo ; Chun, Kukjin ;
Journal of Sensor Science and Technology , volume 23, issue 4, 2014, Pages 234~237
DOI : 10.5369/JSST.2014.23.4.234
In this paper, a copper foil-thick grapheme (thin graphite sheet)-copper foil structure is reported to achieve mechanically strong and high thermal conductive layer suitable for heat spreading components. Since graphene provides much higher thermal conductivity than copper, thick graphene embedded copper layer can achieve higher effective thermal conductivity which is proportional to graphene/copper thickness ratio. Since copper is nonreactive with carbon material which is graphene, chromium is used as adhesion layer to achieve copper-thick graphene-copper bonding for graphene embedded copper layer. Both sides of thick graphene were coated with chromium as an adhesion layer followed by copper by sputtering. The copper foil was bonded to sputtered copper layer on thick graphene. Angstrom's method was used to measure the thermal conductivity of fabricated copper-thick graphene-copper structure. The thermal conductivity of the copper-thick graphene-copper structures is measured as
which is 1.6 times higher than thermal conductivity of pure copper.
A Passive Transponder for Visible Light Identification Using a Solar Cell
Lee, Seong-Ho ;
Journal of Sensor Science and Technology , volume 23, issue 4, 2014, Pages 238~244
DOI : 10.5369/JSST.2014.23.4.238
In this paper, we introduce a new passive transponder that operates without external power in a visible light identification system. The transponder consists of a solar cell, a photodiode, a microprocessor, and a visible LED. When a reader sends light to the transponder, the solar cell generates current from the reader light and supplies power to the other elements in the transponder. At the same time, the photodiode detects the pulse in the reader light and initiates a microprocessor to generate and send a responding light to the reader. In experiments, we realized a passive transponder using a solar cell that operated at a distance of 1m without external power.
Performance Evaluation of a Fiber-Optic Cerenkov Radiation Sensor System Using a Simulated Spent Fuel Assembly
Shin, Sang Hun ; Yoo, Wook Jae ; Jang, Kyoung Won ; Cho, Seunghyun ; Park, Byung Gi ; Lee, Bongsoo ;
Journal of Sensor Science and Technology , volume 23, issue 4, 2014, Pages 245~250
DOI : 10.5369/JSST.2014.23.4.245
When the charged particle travels in transparent medium with a velocity greater than that of light in the same medium, the electromagnetic field close to the particle polarizes the medium along its path, and then the electrons in the atoms follow the waveform of the pulse which is called as Cerenkov light or radiation. This type of radiation can be easily observed in a spent fuel storage pit. In optical fibers, the Cerenkov light also can be generated due to their dielectric components. Accordingly, the radiation-induced light signals can be obtained using optical fibers without any scintillating material. In this study, to measure the intensities of Cerenkov radiation induced by gamma-rays, we have fabricated the fiber-optic Cerenkov radiation sensor system using silica optical fibers, plastic optical fibers, multi-anode photomultiplier tubes, simulated spent fuel assembly and a scanning system. To characterize the Cerenkov radiation generated in optical fibers, the intensities of Cerenkov radiation generated in the silica and plastic optical fibers were measured. Also, we measured the longitudinal distribution of gamma rays emitted from the Ir-192 isotope by using the fiber-optic Cerenkov radiation sensor system and simulated spent fuel assembly.
Study on Vertical Velocity-Based Pre-Impact Fall Detection
Lee, Jung Keun ;
Journal of Sensor Science and Technology , volume 23, issue 4, 2014, Pages 251~258
DOI : 10.5369/JSST.2014.23.4.251
While the feasibility of vertical velocity as a threshold parameter for pre-impact fall detection has been verified, effects of sensor attachment locations and methods calculating vertical acceleration and velocity on the detection performance have not been studied yet. Regarding the vertical velocity-based pre-impact fall detection, this paper investigates detection accuracies of eight different cases depending on sensor locations (waist vs. sternum), vertical accelerations (accurate acceleration based on both accelerometer and gyroscope vs. approximated acceleration based on only accelerometer), and vertical velocities (velocity with attenuation vs. velocity difference). Test results show that the selection of waist-attached sensor, accurate acceleration, and velocity with attenuation based on accelerometer and gyroscope signals is the best in overall in terms of sensitivity and specificity of the detection as well as lead time.
Implementation of Vehicle Wiper Control System Using Image Sensor
Jeon, Jin-Young ; Chang, Hyun-Sook ; Byun, Hyung-Gi ;
Journal of Sensor Science and Technology , volume 23, issue 4, 2014, Pages 259~265
DOI : 10.5369/JSST.2014.23.4.259
When raining or snowing, windshield wiper system is very important for safety of driver. However, manual wiper system frequently needed to be controlled for sufficient visibility and it was very uncomfortable. So, rain sensor which controls automatically was developed. This rain sensor technology uses optical sensing technique sensed the rainfall by receiving reflected light of rain dropped on the windshield. The technology used optical sensor was simple and easy to implement as a rain sensing system in the car. However, it is sometime shown low accuracy to measure rainfall on the windshield when affected by ambient lights from surroundings. It is also given inconvenience to the driver to control the car. To solving these problems, we propose a rain sensing system using image sensor and the fuzzy wiper control algorithm.
Implementation of Film Type Sensor for Synthetic Lube Oil and High Pressure Hydraulic Fluid Leak Detection
Park, No-Jin ; Yu, Dong-Kuen ; Yu, Hong-Kuen ;
Journal of Sensor Science and Technology , volume 23, issue 4, 2014, Pages 266~271
DOI : 10.5369/JSST.2014.23.4.266
Chemical sensors are used in various industrial facilities such high-risk and prevent the leakage of substances, important in life and environmental protection and the safe use of industry, used for management. In particular, high-temperature environments such as power generation equipment of the rotating part due to leakage generated by the various oil, power plants Shut Down, fire, work environment (exposure to various chemical solution and gas leak) and various water, air and soil pollution causes. Thus, over the long term through various channels such as crops and groundwater contamination caused by the slow, serious adverse effect on the ecosystem. In this paper, synthetic lube oil and high pressure hydraulic fluid leakage and immediately detect a new Printed Electronic implementation of technology-based film-type sensors, and its performance test. Thus, industrial accidents and environmental pollution and for early detection of problems, large accidents can be prevented. Experimental results of the synthetic lube oil and high pressure hydraulic fluid solution after the contact time depending on the experiment and the oil solution of the sensor material of the conductive porous PE resistance value by a chemical reaction could be confirmed that rapid increase. Also implemented in the film-type oil sensor electrical resistance change over time of the reaction rate and the synthetic lube oil is about 2 minutes or less, the high pressure hydraulic fluid is less than about 1 minute was. Therefore, more high-pressure hydraulic fluid such as a low volatility synthetic lube oils are the resistance change and the reaction rate was confirmed to be the slowest.
Development of Continuous Real-time COD Measurement Sensor with Double Beam and Multiple Wavelength Analysis
Lee, Joon-Seok ; Shin, Daejung ; Hyoung, Gi-Woo ; Ryu, In-Jae ;
Journal of Sensor Science and Technology , volume 23, issue 4, 2014, Pages 272~277
DOI : 10.5369/JSST.2014.23.4.272
At present, the index of chemical oxygen demand (COD) is widely used as an indicator of organic water pollution with biochemical oxygen demand (BOD). But, traditional COD measurement method are not only with various chemical reagents exhausted, but also long time consumed, the operation procedure and the modification are much professional. This paper reported a novel COD measurement system using double-beam and multiple wavelength analysis UV-VIS spectrometries. It consists of pulsed xenon lamp, two-way optical fiber, optical switch, spectrometer and main processor. Proposed COD measurement system obtains any spectral information of water sample (KHP standard sample and two river water and wastewater) and reference sample (distilled water) in the range of 200~520 nm, corresponding to the COD concentration from 0 to 300 mg/L through calculating the UV absorbance. The system show improved precision and can work continuously fast at time interval about 25 seconds.
Electrochemical Immunosensor Based on the ZnO Nanorods Inside PDMS Channel for H7N9 Influenza Virus Detection
Han, Ji-Hoon ; Lee, Dongyoung ; Pak, James Jungho ;
Journal of Sensor Science and Technology , volume 23, issue 4, 2014, Pages 278~283
DOI : 10.5369/JSST.2014.23.4.278
In this study, we propose an immunosensor using zinc oxide nanorods (NRs) inside PDMS channel for detecting the influenza A virus subtype H7N9. ZnO with high isoelectric point (IEP, ~9.5) makes it suitable for immobilizing proteins with low IEP. In this proposed H7N9 immunosensor structure ZnO NRs were grown on the PDMS channel inner surface to immobilize H7N9 capture antibody. A sandwich enzyme-linked immunosorbent assay (ELISA) method with was used 3,3',5,5' tetramethylbenzidine (TMB) for detecting H7N9 influenza virus. The immunosensor was evaluated by amperometry at various H7N9 influenza antigen concentrations (1 pg/ml - 1 ng/ml). The redox peak voltage and current were measured by amperometry with ZnO NWs and without ZnO NWs inside PDMS channel. The measurement results of the H7N9 immunosensor showed that oxidation peak current of TMB at 0.25 V logarithmically increased from 2.3 to 3.8 uA as the H7N9 influenza antigen concentration changed from 1 pg/ml to 1 ng/ml. And then we demonstrated that ZnO NRs inside PDMS channel can improve the sensitivity of immunosensor to compare non-ZnO NRs inside PDMS channel.
Modeling of Gate/Body-Tied PMOSFET Photodetector with Built-in Transfer Gate
Lee, Minho ; Jo, Sung-Hyun ; Bae, Myunghan ; Choi, Byoung-Soo ; Choi, Pyung ; Shin, Jang-Kyoo ;
Journal of Sensor Science and Technology , volume 23, issue 4, 2014, Pages 284~289
DOI : 10.5369/JSST.2014.23.4.284
In this paper, modeling of a gate/body-tied (GBT) PMOSFET photodetector with built-in transfer gate is performed. It can control the photocurrent with a high-sensitivity. The GBT photodetector is a hybrid device consisted of a MOSFET, a lateral BJT, and a vertical BJT. This device allows for amplifying the photocurrent gain by
due to the GBT structure. However, the operating parameters of this photodetector, including its photocurrent and transfer characteristics, were not known because modeling has not yet been performed. The sophisticated model of GBT photodetector using a process simulator is not compatible with circuit simulator. For this reason, we have performed SPICE modeling of the photodetector with reduced complexity using Cadence's Spectre program. The proposed modeling has been demonstrated by measuring fabricated chip by using 0.35 im 2-poly 4-metal standard CMOS technology.