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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 21, Issue 6 - Nov 2012
Volume 21, Issue 5 - Sep 2012
Volume 21, Issue 4 - Jul 2012
Volume 21, Issue 3 - May 2012
Volume 21, Issue 2 - Mar 2012
Volume 21, Issue 1 - Jan 2012
Selecting the target year
Current-to-Voltage Converter Using Current-Mode Multiple Reset and its Application to Photometric Sensors
Park, Jae-Hyoun ; Yoon, Hyung-Do ;
Journal of Sensor Science and Technology , volume 21, issue 1, 2012, Pages 1~6
DOI : 10.5369/JSST.2012.21.1.1
Using a current-mode multiple reset, a current-to-voltage(I-V) converter with a wide dynamic range was produced. The converter consists of a trans-impedance amplifier(TIA), an analog-to-digital converter(ADC), and an N-bit counter. The digital output of the I-V converter is composed of higher N bits and lower bits, obtained from the N-bit counter and the ADC, respectively. For an input current that has departed from the linear region of the TIA, the counter increases its digital output, this determines a reset current which is subtracted from the input current of the I-V converter. This current-mode reset is repeated until the input current of the TIA lies in the linear region. This I-V converter is realized using 0.35
LSI technology. It is shown that the proposed I-V converter can increase the maximum input current by a factor of
and widen the dynamic range by
. Additionally, the I-V converter is successfully applied to a photometric sensor.
Dual Sampling-Based CMOS Active Pixel Sensor with a Novel Correlated Double Sampling Circuit
Jo, Sung-Hyun ; Bae, Myung-Han ; Jung, Joon-Taek ; Choi, Pyung ; Shin, Jang-Kyoo ;
Journal of Sensor Science and Technology , volume 21, issue 1, 2012, Pages 7~12
DOI : 10.5369/JSST.2012.21.1.7
In this paper, we propose a 4-transistor active pixel sensor(APS) with a novel correlated double sampling(CDS) circuit for the purpose of extending dynamic range. Dual sampling techniques can overcome low-sensitivity and temporal disparity problems at low illumination. To accomplish this, two images are obtained at the same time using different sensitivities. The novel CDS circuit proposed in this paper contains MOS switches that make it possible for the capacitance of a conventional CDS circuit to function as a charge pump, so that the proposed APS exhibits an extended dynamic range as well as reduced noise. The designed circuit was fabricated by using
2-poly 4-metal standard CMOS technology and its characteristics have been evaluated.
Synthesis and Characterization of 2, 6-Di-(4'-Methyl Phenyl) Pyrylium Fluoroborate and Perchlorate in Single Step Salts Using 4'-Methyl Acetophenone
Wie, Jin-Hyeong ; Hong, Young-Min ; Kim, Hyun-Ook ; Kim, Kyung-Hoon ; Cho, Sung-Il ;
Journal of Sensor Science and Technology , volume 21, issue 1, 2012, Pages 13~20
DOI : 10.5369/JSST.2012.21.1.13
Due to its high conductivity, pyrylium has been frequently used in electron transfer reactions or in the synthesis of various organic materials. It has also been used as a sensor material. Traditionally, the compounds have been synthesized using various methods; mostly in a multiple steps. In this study, two pyrylium salts, 2, 6-di-(4'-methylphenyl) pyrylium fluoroborate and perchlorate were synthesized. The synthesis of these products was confirmed by 1H-NMR, LC/TOF-MS and FT-IR analyses while their photo-properties were analyzed using UV/VIS spectrophotometry. In addition, the electron transfer capacities of the salts were analyzed with a conductivity meter, it was found that their electron conductivities were high. When the synthesized compounds were dissolved in acetone, a green fluorescent material was observed to form. The fluorescent material can be used as a sensitizer in the electrical industry.
Embedded System for Automatic Condensation Control of the Car
Lee, Dmitriy ; Bae, Yong-Wook ; Lee, Neung-Ho ; Seo, Hee-Don ;
Journal of Sensor Science and Technology , volume 21, issue 1, 2012, Pages 21~27
DOI : 10.5369/JSST.2012.21.1.21
In this study, we designed an embedded system for automatic condensation control(ESCC) of the car. This system heats the car glasses as and when it is needed that makes driving safer and convenient. The system was built on an ATmega128L central processing unit(CPU), using high-performance electrically erasable programmable read-only memory(EEPROM) complex programmable logic device(CPLD) ATF1504AS, using which an ESCC algorithm has been proposed. The source code was written in C language. The algorithm of work was written using the dew-point table. This system not only clears the condensation on the glass but also averts condensation. The designed ESCC system begins working once the input information comes close to the dew-point table information. This device enables a wider field of view, thereby increasing safety.
Human Hand Detection Using Color Vision
Kim, Jun-Yup ; Do, Yong-Tae ;
Journal of Sensor Science and Technology , volume 21, issue 1, 2012, Pages 28~33
DOI : 10.5369/JSST.2012.21.1.28
The visual sensing of human hands plays an important part in many man-machine interaction/interface systems. Most existing visionbased hand detection techniques depend on the color cues of human skin. The RGB color image from a vision sensor is often transformed to another color space as a preprocessing of hand detection because the color space transformation is assumed to increase the detection accuracy. However, the actual effect of color space transformation has not been well investigated in literature. This paper discusses a comparative evaluation of the pixel classification performance of hand skin detection in four widely used color spaces; RGB, YIQ, HSV, and normalized rgb. The experimental results indicate that using the normalized red-green color values is the most reliable under different backgrounds, lighting conditions, individuals, and hand postures. The nonlinear classification of pixel colors by the use of a multilayer neural network is also proposed to improve the detection accuracy.
Fabrication of Test Socket from BeCu Metal Sheet
Kim, Bong-Hwan ;
Journal of Sensor Science and Technology , volume 21, issue 1, 2012, Pages 34~38
DOI : 10.5369/JSST.2012.21.1.34
We have developed a cost effective test socket for ball grid array(BGA) integrated circuit(IC) packages using BeCu metal sheet as a test probe. The BeCu furnishes the best combination of electrical conductivity and corrosion resistance. The probe of the test socket was designed with a BeCu cantilever. The cantilever was designed with a length of 450
, a width of 200
, a thickness of 10
, and a pitch of 650
BGA. The fabrication of the test socket used techniques such as through-silicon-via filling, bonding silicon wafer and BeCu metal sheet with dry film resist(DFR). The test socket is applicable for BGA IC chip.
Implementation and Evaluation of Abnormal ECG Detection Algorithm Using DTW Minimum Accumulation Distance
Noh, Yun-Hong ; Lee, Young-Dong ; Jeong, Do-Un ;
Journal of Sensor Science and Technology , volume 21, issue 1, 2012, Pages 39~45
DOI : 10.5369/JSST.2012.21.1.39
Recently the convergence of healthcare technology is used for daily life healthcare monitoring. Cardiac arrhythmia is presented by the state of the heart irregularity. Abnormal heart's electrical signal pathway or heart's tissue disorder could be the cause of cardiac arrhythmia. Fatal arrhythmia could put patient's life at risk. Therefore arrhythmia detection is very important. Previous studies on the detection of arrhythmia in various ECG analysis and classification methods had been carried out. In this paper, an ECG signal processing techniques to detect abnormal ECG based on DTW minimum accumulation distance through the template matching for normalized data and variable threshold method for ECG R-peak detection. Signal processing techniques able to determine the occurrence of normal ECG and abnormal ECG. Abnormal ECG detection algorithm using DTW minimum accumulation distance method is performed using MITBIH database for performance evaluation. Experiment result shows the average percentage accuracy of using the propose method for Rpeak detection is 99.63 % and abnormal detection is 99.60 %.
WSN-based Coastal Environment Monitoring System Using Flooding Routing Protocol
Yoo, Jae-Ho ; Lee, Chang-Hee ; Ock, Young-Seok ; Chung, Wan-Young ;
Journal of Sensor Science and Technology , volume 21, issue 1, 2012, Pages 46~52
DOI : 10.5369/JSST.2012.21.1.46
The rapid water pollution in stream, river, lake and sea in recent years raises an urgent need for continuous monitoring and policymaking to conserve the global clean environment. In particular, the increasing water pollution in coastal marine areas adds to the importance of the environmental monitoring systems. In this paper, the mobile server is designed to gathers information of the water quality at coastal areas. The obtained data by the server is transmitted from field servers to the base station via multi-hop communication in wireless sensor network. The information collected includes dissolved oxygen(DO), hydrogen ion exponent(pH), temperature, etc. By the information provided the real-time monitoring of water quality at the coastal marine area. In addition, wireless sensor network-based flooding routing protocol was designed and used to transfer the measured water quality information efficiently. Telosb sensor node is programmed using nesC language in TinyOS platform for small scale wireless sensor network monitoring from a remote server.
Repeatability Study of a Pneumatic Dispensing System for Bio-Applications
Lee, Sang-Min ; Choi, In-Ho ; Kim, Joon-Won ;
Journal of Sensor Science and Technology , volume 21, issue 1, 2012, Pages 53~58
DOI : 10.5369/JSST.2012.21.1.53
Biological and chemical assays(e.g., clinical tests for medical diagnosis) are needed to handle small liquid volume with high accuracy and high reliability. Many micro-dispensing systems using various actuation methods have been developed and applied. In this research, we confirm repeatability of the cartridge-type dispensing system with various measuring methods for guarantee of an acceptable reliability. We systematically examine the dispensed volume variation and dispense rate during 500,000 shots of sequential actuation. Using the same method, we confirm the repeatability of dispensed volume while varying operating conditions and design parameter(i.e., outlet size) of the dispensing system. Also, we examine the consistency of the dispensed volume of droplet while varying the operating pressures. Furthermore, we repeatedly measure differences between an actual dispensed volume and a target volume. According to our results, it is expected that the stable and reliable performance of our dispensing system can effectively be used in various applications containing bio-solutions.
The Redundancy Reduction Using Fuzzy C-means Clustering and Cosine Similarity on a Very Large Gas Sensor Array for Mimicking Biological Olfaction
Kim, Jeong-Do ; Kim, Jung-Ju ; Park, Sung-Dae ; Byun, Hyung-Gi ; Persaud, K.C. ; Lim, Seung-Ju ;
Journal of Sensor Science and Technology , volume 21, issue 1, 2012, Pages 59~67
DOI : 10.5369/JSST.2012.21.1.59
It was reported that the latest sensor technology allow an 65536 conductive polymer sensor array to be made with broad but overlapping selectivity to different families of chemicals emulating the characteristics found in biological olfaction. However, the supernumerary redundancy always accompanies great error and risk as well as an inordinate amount of computation time and local minima in signal processing, e.g. neural networks. In this paper, we propose a new method to reduce the number of sensor for analysis by reducing redundancy between sensors and by removing unstable sensors using the cosine similarity method and to decide on representative sensor using FCM(Fuzzy C-Means) algorithm. The representative sensors can be just used in analyzing. And, we introduce DWT(Discrete Wavelet Transform) for data compression in the time domain as preprocessing. Throughout experimental trials, we have done a comparative analysis between gas sensor data with and without reduced redundancy. The possibility and superiority of the proposed methods are confirmed through experiments.
Swept Source-Optical Coherence Tomography Using New Recalibration Method for Nonlinear Sweeping Laser
Eom, Jin-Seob ;
Journal of Sensor Science and Technology , volume 21, issue 1, 2012, Pages 68~74
DOI : 10.5369/JSST.2012.21.1.68
In this paper, Frequency Domain Mode Locked(FDML) wavelength swept laser with 55.027 kHz sweeping speed and 125 nm sweeping range has realized, and also a new method for recalibrating a nonlinear frequency sweeping of a swept laser has proposed. The Swept Source-Optical Coherence Tomography system using the proposed method has performed. For a mirror surface, the system showed the very clean 2-dimensional image and the advanced image speed of 7 frames per sec compared to the previous recalibration method.
The Design of Filter for Hearth Liquid Level Estimation in Blast Furnace
Cho, Nae-Soo ; Han, Mu-Ho ; Kwon, Woo-Hyen ; Choi, Youn-Ho ;
Journal of Sensor Science and Technology , volume 21, issue 1, 2012, Pages 75~81
DOI : 10.5369/JSST.2012.21.1.75
Optimizing the tapping time of a blast furnace is important to a stable operation and life extension. To optimize the tapping time of the blast furnace, the location of Hearth Liquid Level should be recognized. There are several ways to measure the hearth liquid level in the blast furnace, such as Electromotive Force(EMF) measurement, pressure measurement by putting in nitrogen probe and manometry with strain gauge. In this paper, it will be discussed using strain gauge among the three methods. Conventional strain gauge must be revised periodically. Since, internal pressure, temperature of internal refractory material and wind pressure have effect on the strain gauge. However, static pressure value is required to compensate. To solve these problems, this paper suggests finding relationship between Hearth Liquid Level and strain gauge output, adding digital filter in strain gauge. Using the proposed method, it was possible to estimate the hearth liquid level and determine the appropriate tapping time. Usefulness of the proposed method through simulations and experimental results are confirmed.