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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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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
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The Design and Modeling of a Reconfigurable Inset-Fed Microstrip Patch High Gain Antenna for Wireless Sensor Networks
Phan, Duy-Thach ; Chung, Gwiy-Sang ;
Journal of Sensor Science and Technology , volume 20, issue 3, 2011, Pages 145~150
DOI : 10.5369/JSST.2011.20.3.145
In this paper, we designed a tunable microstrip patch antenna using RF MEMS switches. The design and simulation of the antenna were performed using a high frequency structure simulator(HFSS). The antenna was designed for use in the ISM band and either operates at 2.4 GHz or 5.7 GHz achieving -10 dB return-loss bandwidths of 20 MHz and 180 MHz, respectively. In order to obtain high efficiency and improve the ease of integration, a high resistivity silicon(HRS) wafer on a glass substrate was used for the antenna. The antenna achieved high gains: 8 dB at 5.7 GHz and 1 dB at 2.4 GHz. The RF MEMS DC contact switches were simulated and analyzed using ANSYS software.
An Identification Technique Based on Adaptive Radial Basis Function Network for an Electronic Odor Sensing System
Byun, Hyung-Gi ;
Journal of Sensor Science and Technology , volume 20, issue 3, 2011, Pages 151~155
DOI : 10.5369/JSST.2011.20.3.151
A variety of pattern recognition algorithms including neural networks may be applicable to the identification of odors. In this paper, an identification technique for an electronic odor sensing system applicable to wound state monitoring is presented. The performance of the radial basis function(RBF) network is highly dependent on the choice of centers and widths in basis function. For the fine tuning of centers and widths, those parameters are initialized by an ill-conditioned genetic fuzzy c-means algorithm, and the distribution of input patterns in the very first stage, the stochastic gradient(SG), is adapted. The adaptive RBF network with singular value decomposition(SVD), which provides additional adaptation capabilities to the RBF network, is used to process data from array-based gas sensors for early detection of wound infection in burn patients. The primary results indicate that infected patients can be distinguished from uninfected patients.
UV Responsive Characteristics of n-Channel Schottky Barrier MOSFET with ITO as Source/Drain Contacts
Kim, Tae-Hyeon ; Lee, Chang-Ju ; Kim, Dong-Seok ; Sung, Sang-Yun ; Heo, Young-Woo ; Lee, Jung-Hee ; Hahm, Sung-Ho ;
Journal of Sensor Science and Technology , volume 20, issue 3, 2011, Pages 156~161
DOI : 10.5369/JSST.2011.20.3.156
We fabricated a schottky barrier metal oxide semiconductor field effect transistor(SB-MOSFET) by applying indium-tin-oxide(ITO) to the source/drain on a highly resistive GaN layer grown on a silicon substrate. The MOSFET, with 10
gate length and 100
gate width, exhibits a threshold gate voltage of 2.7 V, and has a sub-threshold slope of 240 mV/dec taken from the
characteristics at a low drain voltage of 0.05 V. The maximum drain current is 18 mA/mm and the maximum transconductance is 6 mS/mm at
=3 V. We observed that the spectral photo-response characterization exhibits that the cutoff wavelength was 365 nm, and the UV/visible rejection ratio was about 130 at
= 5 V. The MOSFET-type UV detector using ITO, has a high UV photo-responsivity and so is highly applicable to the UV image sensors.
Light-Adaptive Vision System for Remote Surveillance Using an Edge Detection Vision Chip
Choi, Kyung-Hwa ; Jo, Sung-Hyun ; Seo, Sang-Ho ; Shin, Jang-Kyoo ;
Journal of Sensor Science and Technology , volume 20, issue 3, 2011, Pages 162~167
DOI : 10.5369/JSST.2011.20.3.162
In this paper, we propose a vision system using a field programmable gate array(FPGA) and a smart vision chip. The output of the vision chip is varied by illumination conditions. This chip is suitable as a surveillance system in a dynamic environment. However, because the output swing of a smart vision chip is too small to definitely confirm the warning signal with the FPGA, a modification was needed for a reliable signal. The proposed system is based on a transmission control protocol/internet protocol(TCP/IP) that enables monitoring from a remote place. The warning signal indicates that some objects are too near.
Fabrication of a Porous 3C-SiC Based Resistivity Hydrogen Sensor and Its Characteristics
Kim, Kang-San ; Chung, Gwiy-Sang ;
Journal of Sensor Science and Technology , volume 20, issue 3, 2011, Pages 168~171
DOI : 10.5369/JSST.2011.20.3.168
Porous 3C-SiC(pSiC) samples with different pore diameters were prepared from poly crystalline N-type 3C-SiC by electrochemical anodization. The pSiC surface was chemically modified by the sputtering of Pd and Pt nano-particles as a hydrogen catalyst. Changes in resistance were monitored with hydrogen concentrations in the range of 110 ppm - 410 ppm. The variations of the electrical resistance in the presence of hydrogen demonstrated that Pd and Pt-deposited pSiC samples have the ability to detect hydrogen at room temperature. Regardless of the catalyst, the 25 nm pore diameter samples showed good response and recovery properties. However, the 60 nm samples showed unstable and slow response. It was found that the pore size affects the catalyst reaction and consequently, results in changes of the sensitivity to hydrogen.
Development of Two-Finger Force Measuring System to Measure Two-Finger Gripping Force and Its Characteristic Evaluation
Kim, Hyeon-Min ; Shin, Hi-Suk ; Yoon, Joung-Won ; Kim, Gab-Soon ;
Journal of Sensor Science and Technology , volume 20, issue 3, 2011, Pages 172~177
DOI : 10.5369/JSST.2011.20.3.172
Finger patients can't use their hands because of the paralysis their fingers. Their fingers are recovered by rehabilitating training, and the rehabilitating extent can be judged by measuring the pressing force to be contacted with two fingers(thumb and first finger, thumb and middle finger, thumb and ring finger, thumb and little finger). At present, most hospitals have used a thin plastic-plate for measuring the two-finger grasping force, and we can only judge that they can grasp the plate with their two-finger through it, because the plate can't measure the two-finger grasping force. But, recently, the force measuring system for measuring two-finger grasping force was developed using three-axis force sensor, but it is very expensive, because it has a three-axis force sensor. In this paper, two-finger force measuring system with a one-axis force sensor which can measure two-finger grasping force was developed. The one-axis force sensor was designed and fabricated, and the force measuring device was designed and manufactured using DSP(Digital Signal Processing). Also, the grasping force test of men was performed using the developed two-finger force measuring system, it was confirmed that the grasping forces of men were different according to grasping methods, and the system can be used for measuring two-finger grasping force.
Vision-Based Mobile Robot Navigation by Robust Path Line Tracking
Son, Min-Hyuk ; Do, Yong-Tae ;
Journal of Sensor Science and Technology , volume 20, issue 3, 2011, Pages 178~186
DOI : 10.5369/JSST.2011.20.3.178
Line tracking is a well defined method of mobile robot navigation. It is simple in concept, technically easy to implement, and already employed in many industrial sites. Among several different line tracking methods, magnetic sensing is widely used in practice. In comparison, vision-based tracking is less popular due mainly to its sensitivity to surrounding conditions such as brightness and floor characteristics although vision is the most powerful robotic sensing capability. In this paper, a vision-based robust path line detection technique is proposed for the navigation of a mobile robot assuming uncontrollable surrounding conditions. The technique proposed has four processing steps; color space transformation, pixel-level line sensing, block-level line sensing, and robot navigation control. This technique effectively uses hue and saturation color values in the line sensing so to be insensitive to the brightness variation. Line finding in block-level makes not only the technique immune from the error of line pixel detection but also the robot control easy. The proposed technique was tested with a real mobile robot and proved its effectiveness.
Etching Characteristics of Micro Blaster for MEMS Applications
Cho, Chan-Seob ; Bae, Ig-Soon ; Lee, Jong-Hyun ;
Journal of Sensor Science and Technology , volume 20, issue 3, 2011, Pages 187~192
DOI : 10.5369/JSST.2011.20.3.187
Abrasive blaster is similar to sand blaster, and effectively removes hard and brittle materials. Exiting abrasive blaster has applied to rough working such as deburring and rough finishing. As the need for machining of ceramics, semiconductor, electronic devices and LCD are increasing, micro abrasive blaster was developed, and became the inevitable technique to micromachining. This paper describes the performance of the micro blaster in MEMS process of glass and succeed in domestically producing complete micro blaster. Diameter of hole and width of line in this etching is 100
. Experimental results showed good performance in micro channel and hole in glass wafer. Therefore, this micro blaster could be effectively applied to the micro machining of semiconductor, micro PCR chip.
Visible Light Identification System Using Optoelectronic Feedback of A Lighting LED
Lee, Seong-Ho ;
Journal of Sensor Science and Technology , volume 20, issue 3, 2011, Pages 193~198
DOI : 10.5369/JSST.2011.20.3.193
In this paper, we used optoelectronic feedback to generate the carrier frequency for the ASK modulation of a lighting LED. A solar cell was used for photo-detector in the feedback circuit, and the LED light was ASK modulated by controlling the ON/OFF state of the switch that is installed in the feedback loop. The oscillation frequency of the optoelectronic feedback loop was about 50 kHz and the data rate of the ASK modulation was 9.6 kbps. In experiments, the optoelectronic feedback circuit was used for the ASK modulation of a lighting LED in the transponder of a visible light identification system, and data exchange between the transponder and the reader was successfully carried out.
The Design of Code Detector for Sell Call Radio Buoy
Cho, Nae-Soo ; Kim, Joo-Hwan ; Youn, Kyoung-Seop ; Kwon, Woo-Hyen ;
Journal of Sensor Science and Technology , volume 20, issue 3, 2011, Pages 199~206
DOI : 10.5369/JSST.2011.20.3.199
Sell call radio buoy is mostly used for searching for the location of fishing nets. Sell call radio buoy for the detection of the code uses the band pass filter(BPF). All BPF is used by imported from Japanese companies. But, Japanese companies stopped selling buoys for searching for the location of fishing nets, and domestic manufacturing companies could not sell buoys any more. Therefore, In this paper, a new method to replace the conventional buoy code detector is proposed. The proposed methods are constructed with an analog filter division composed of BPFs and notch filters as well as a microprocessor with analog digital converters. The advantage of proposed methods is able to combine various codes, can enhance receiver sensitivity. The experimental results confirm the usefulness of the proposed method.
Black Silicon of Pyramid Structure Formation According to the RIE Process Condition
Jo, Jun-Hwan ; Kong, Dae-Young ; Cho, Chan-Seob ; Kim, Bong-Hwan ; Bae, Young-Ho ; Lee, Jong-Hyun ;
Journal of Sensor Science and Technology , volume 20, issue 3, 2011, Pages 207~212
DOI : 10.5369/JSST.2011.20.3.207
In this study, pyramid structured black silicon process was developed in order to overcome disadvantages of using wet etching to texture the surface of single crystalline silicon and using grass/needle-like black silicon structure. In order to form the pyramidal black silicon structure on the silicon surface, the RIE system was modified to equip with metal-mesh on the top of head shower. The process conditions were :
gas flow 15/15 sccm, RF power of 200 W, pressure at 50 mTorr ~ 200 mTorr, and temperature at
. The pressure did not affect the pyramid structure significantly. Increasing processing time increased the size of the pyramid, however, the size remained constant at 1
between 15 minutes ~ 20 minutes of processing. Pyramid structure of 1
in size showed to have the lowest reflectivity of 7 % ~ 10 %. Also, the pyramid structure black silicon is more appropriate than the grass/needle-like black silicon when creating solar cells.
The Silicon Type Load Cell with SUS630 Diaphragm
Moon, Young-Soon ; Lee, Seon-Gil ; Ryu, Sang-Hyuk ; Choi, Sie-Young ;
Journal of Sensor Science and Technology , volume 20, issue 3, 2011, Pages 213~218
DOI : 10.5369/JSST.2011.20.3.213
The load cell is a force sensor and a transducer that is used to convert a physical force into a electrical signal for weighing equipment. Most conventional load cells are widely used a metal foil strain gauge for sensing element when force being applied spring element in order to converts the deformation to electrical signals. The sensitivity of a load cell is limited by its low gauge factor, hysteresis and creep. But silicon-based sensors perform with higher reliability. This paper presents the basic design and development of the silicon type load cell with an SUS630 diaphragm. The load cell consists of two parts the silicon strain gauge and the SUS630 structure with diaphragm. Structure analysis of load cell was researched by theory to optimize the load cell diaphragm design and to determine the position of peizoresistors on a silicon strain gauge. The piezo-resistors are integrated in the four points of silicon strain gauge processed by ion implantation. The thickness of the silicon strain gauge was polished by CMP under 100
. The 10 mm diameter SUS630 diaphragm was designed for loads up to 10 kg with 300
of diaphragm thickness. The load cell was successfully tested, the variation of
R(%) of four points on the silicon strain gauge is good linearity properties and sensitivity.