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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 19, Issue 6 - Nov 2010
Volume 19, Issue 5 - Sep 2010
Volume 19, Issue 4 - Jul 2010
Volume 19, Issue 3 - May 2010
Volume 19, Issue 2 - Mar 2010
Volume 19, Issue 1 - Jan 2010
Selecting the target year
Automation of urine dipstick test by simultaneous scanning : A pilot study
Lee, Sang-Bong ; Choi, Seong-Su ; Lee, In-Kwang ; Han, Jeong-Su ; Kim, Wan-Seok ; Kim, Wun-Jae ; Cha, Eun-Jong ; Kim, Kyung-Ah ;
Journal of Sensor Science and Technology , volume 19, issue 3, 2010, Pages 169~175
DOI : 10.5369/JSST.2010.19.3.169
Urinalysis is an important clinical test to diagnose urinary diseases, and dipstick method with visual inspection is widely applied in practice. Automated optical devices recently developed have disadvantages of long measurement time, big size and heavy weight, accuracy degradation with time, etc. The present study proposed a new computer scanning technique, in which the test strip and the standard chart were simultaneously scanned to remove any environmental artifacts, followed by automated differentiation with the minimum distance algorithm, leading to significant enhancement of accuracy. Experiments demonstrated an accuracy of 100 % in that all test results were identical with the human visual inspection. The present technique only uses a personal computer with scanner and shortens the test time to a great degree. The results are also stored and accumulated for later use which can be transmitted to remote locations through a network, thus could be easily integrated to any ubiquitous health care systems.
Characteristic comparison of sensing materials in mixed potential type NH
gas sensors for urea-SCR DeNOx system in diesel engine
Choi, An-Gi ; Yang, Young-Chang ; Koo, Bon-Chul ; Park, C.O. ;
Journal of Sensor Science and Technology , volume 19, issue 3, 2010, Pages 176~183
DOI : 10.5369/JSST.2010.19.3.176
It is considered that the urea injection DeNOx SCR(selective catalytic reduction) system is the only promising method to satisfy the worldwide NOx emission standards. As for the theoretical aspect, reactants of NO and
which do not harm human beings and environmental as well. The realization of maximum NOx conversion (without using a post oxidation catalyst) is only possible with closed loop controlled urea dosing. It means built-in
gas sensor have to be developed for detecting accurate
concentration for the feedback system. Using YSZ(yttria-stabilized zirconia) as a solid state electrolyte and
as a sensing material, this paper aims to study dependable
gas sensor for the promising solution of DeNOx technology, which have a reproducible electric output signal, a high sensitivity and fast response.
Development of optical dual-sensors for submersion monitoring using zigbee-based wireless sensor networks
Key, Kwang-Hyun ; Kim, Hyung-Pyo ; Sohn, Kyung-Rak ;
Journal of Sensor Science and Technology , volume 19, issue 3, 2010, Pages 184~190
DOI : 10.5369/JSST.2010.19.3.184
In this paper, a remote submersion warning system based on multi-mode optical fiber(MMF) sensors and a wireless sensor network(WSN) are proposed. To improve the reliability and stability of the sensors, the dual optical fiber sensors combined to the optical coupler are demonstrated. A slave zigbee as a wireless sensor module was used as a platform to monitor and record the signal from the MMF sensors and then transmits these information to a master zigbee wirelessly. The monitoring system running the
software was connected to the internet to support the short message service(SMS) through extensible markup language(XML) web service. No matter where the managers are, they can always receive the real-time remote-monitoring data for safety check.
Modeling of non-ideal frequency response in capacitive MEMS resonator
Ko, Hyoung-Ho ;
Journal of Sensor Science and Technology , volume 19, issue 3, 2010, Pages 191~196
DOI : 10.5369/JSST.2010.19.3.191
In this paper, modeling of the non-ideal frequency response, especially "notch-and-spike" magnitude phenomenon and phase lag distortion, are discussed. To characterize the non-ideal frequency response, a new electro-mechanical simulation model based on SPICE is proposed using the driving loop of the capacitive vibratory gyroscope. The parasitic components of the driving loop are found to be the major factors of non-ideal frequency response, and it is verified with the measurement results.
Fabrication of NO sensor integrated SiC micro heaters for harsh environments and its characteristics
Kim, Kang-San ; Chung, Gwiy-Sang ;
Journal of Sensor Science and Technology , volume 19, issue 3, 2010, Pages 197~201
DOI : 10.5369/JSST.2010.19.3.197
This paper describes the fabrication and characteristics of a NO sensor using ZnO thin film integrated 3C-SiC micro heater based on polycrystalline 3C-SiC thin film of operation in harsh environments. The sensitivity, response time, and operating properties in high temperature and voltages of NO sensors based SiC MEMS are measured and analyzed. The sensitivity of device with pure ZnO thin film at the heater operating power of 13.5 mW (
) is 0.875 in NO gas concentration of 0.046 ppm. In the case of Pt doping, the sensitivity of at power consumption of 5.9 mW (
) was 1.92 at same gas flow rate. The ZnO with doped Pt was showed higher sensitivity, lower working temperature and faster adsorption characteristics to NO gas than pure ZnO thin film. The NO gas sensor integrated SiC micro heater is more strength than others in high voltage and temperature environments.
A study on the crystalline orientation and electric properties of sol-gel PZT thin film for piezoelectric sensors
Byun, Jin-Moo ; Lee, Ho-Nyun ; Lee, Hong-Kee ; Lee, Seong-Eui ; Lee, Hee-Chul ;
Journal of Sensor Science and Technology , volume 19, issue 3, 2010, Pages 202~208
DOI : 10.5369/JSST.2010.19.3.202
This study examined the dependency of crystalline orientation and electric properties of sol-gel PZT film on hydrolysis, a
seed layer and a concentration of sol-gel solution. The PZT thin films were prepared by using 2-Methoxyethanol-based sol-gel method and spin-coating on Pt/Ti/
/Si substrates. The 1-
-thick PZT films were coated and then fired in a furnace by direct insert method. The highly (111) oriented PZT film of pure perovskite structure could be obtained. We could control the degree of orientation by various parameters such as hydrolysis, a
seed layer and a concentration of sol-gel solution. The highest measured remanent polarization, dielectric constant and piezoelectric coefficient are
, 2808, and 159 pC/N, respectively.
Fabrication of AlN piezoelectric micro power generator suitable with CMOS process and its characteristics
Chung, Gwiy-Sang ; Lee, Byung-Chul ;
Journal of Sensor Science and Technology , volume 19, issue 3, 2010, Pages 209~213
DOI : 10.5369/JSST.2010.19.3.209
This paper describes the fabrication and characteristics of AlN piezoelectric MPG(micro power generator). The micro energy harvester was fabricated to convert ambient vibration energy to electrical power as a AlN piezoelectric cantilever with Si proof-mass. To be compatible with CMOS process, AlN thin film was grown at low temperature by RF magnetron sputtering and micro power generators were fabricated by MEMS technologies. X-ray diffraction pattern proved that the grown AlN film had highly(002) orientation with low value of FWHM(full width at the half maximum,
) in the rocking curve around(002) reflections. The implemented harvester showed the
highest membrane displacement and generated 6.4 nW of electrical power to
resistive load with
voltage from 1.0 G acceleration at its resonant frequency of 389 Hz. From these results, the AlN piezoelectric MPG will be possible to suitable with the batch process and confirm the possibility for power supply in portable, mobile and wearable microsystems.
Study on the chemical environment for conformational change of i-motif DNA by atomic force microscopy cantilever
Jung, Hwi-Hun ; Park, Jin-Sung ; Yang, Jae-Moon ; Lee, Sang-Woo ; Eom, Kil-Ho ; Kwon, Tae-Yun ; Yoon, Dae-Sung ;
Journal of Sensor Science and Technology , volume 19, issue 3, 2010, Pages 214~220
DOI : 10.5369/JSST.2010.19.3.214
Three-dimensional(3D) structure of specific DNA can be changed between two conformations under an external environmental transition such as pH and salt concentration variations. We have experimentally observed the conformational transitions of i-motif DNA using AFM cantilever bioassay. It is shown that pH change of a solvent induces the bending defleciton change of a cantilever functionalized by i-motif DNA. This indicates that cantilever bioassay enables the label-free detection of DNA structural changes upon pH change. It is implied that cantilever bioassay can be a de novo route to quantitatively understand the conformational transitions of biological molecules under environmental changes.
Positioning sensor system for mobile robots using magnetic markers
Kim, Eui-Sun ; Kim, Won-Ho ;
Journal of Sensor Science and Technology , volume 19, issue 3, 2010, Pages 221~229
DOI : 10.5369/JSST.2010.19.3.221
In recent studies, many methods have been studied for mobile robot using magnetic markers on its pathway. This is not influenced by the weather conditions, and makes possible to develop controller with low level processors and simple algorithms. However, the interval between magnets is restricted by the magnetic field intensity and it is impossible to get road information ahead. This paper suggests a method of widening markers and expressing the road information ahead using magnetic markers, and explains a sensor arrangement considering suggested methods. Also, magnetic field analysis was done to investigate the effects of widening magnetic markers with various environments. A small mobile robot was made to figure out the performance of suggested methods, and driving experiments were performed on the straight and curved road with magnetic markers. The results show that the robot moved the prearranged pathway with 0.5 cm lateral displacements and stopped at a stop line using magnetic information on the road.
Sensor signal processing device for USN application and general purpose
Park, Chan-Won ; Kim, Il-Hwan ; Chun, Sam-Sug ;
Journal of Sensor Science and Technology , volume 19, issue 3, 2010, Pages 230~237
DOI : 10.5369/JSST.2010.19.3.230
In sensor signal conditioning and processing, offset and drift characteristics of an operational amplifier are an important factor when the amplifier is used for a precise sensor signal amplifier. In order to use it in high accuracy, an expensive trimming or a complex compensation circuit is required. This paper presents the improved sensor signal conditioning and processing device for ubiquitous sensor network(USN) application or general purpose by developing a hardware of the circuit for reducing the offset voltage and drift characteristics, and a software for its control and sensor signal processing. We realize better offset voltage and drift characteristics of the signal conditioning circuit using low cost operational amplifiers. The experimental results show that this technique is effective in improving the performance of the sensor signal processing device.
Development of finger-force measuring system with three-axis force sensor for measuring a spherical-object grasping force
Kim, Hyeon-Min ; Kim, Gab-Soon ;
Journal of Sensor Science and Technology , volume 19, issue 3, 2010, Pages 238~245
DOI : 10.5369/JSST.2010.19.3.238
Stroke patients can't use their hands because of the paralysis of their fingers. Their fingers are recovered by rehabilitating training, and the rehabilitating extent can be judged by grasping a spherical object. At present, the object used in hospital is only a spherical object, and can't measure the force of fingers. Therefore, doctors judge the rehabilitating extent by touching and watching at their fingers. So, the spherical object measuring system which can measure the force of their fingers should be developed. In this paper, the finger-force measuring system with a three-axis force sensor which can measure the spherical-object grasping force is developed. The three-axis force sensor is designed and fabricated, and the force measuring device is designed and manufactured using DSP(digital signal processing). Also, the grasping force test of men is performed using the developed finger-force measuring system, it was confirmed that the average force of men was about 120 N.
Implementation of a sensor fusion system for autonomous guided robot navigation in outdoor environments
Lee, Seung-H. ; Lee, Heon-C. ; Lee, Beom-H. ;
Journal of Sensor Science and Technology , volume 19, issue 3, 2010, Pages 246~257
DOI : 10.5369/JSST.2010.19.3.246
Autonomous guided robot navigation which consists of following unknown paths and avoiding unknown obstacles has been a fundamental technique for unmanned robots in outdoor environments. The unknown path following requires techniques such as path recognition, path planning, and robot pose estimation. In this paper, we propose a novel sensor fusion system for autonomous guided robot navigation in outdoor environments. The proposed system consists of three monocular cameras and an array of nine infrared range sensors. The two cameras equipped on the robot's right and left sides are used to recognize unknown paths and estimate relative robot pose on these paths through bayesian sensor fusion method, and the other camera equipped at the front of the robot is used to recognize abrupt curves and unknown obstacles. The infrared range sensor array is used to improve the robustness of obstacle avoidance. The forward camera and the infrared range sensor array are fused through rule-based method for obstacle avoidance. Experiments in outdoor environments show the mobile robot with the proposed sensor fusion system performed successfully real-time autonomous guided navigation.