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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Sensor Science and Technology
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Journal DOI :
The Korean Sensors Society
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Volume & Issues
Volume 13, Issue 6 - Nov 2004
Volume 13, Issue 5 - Sep 2004
Volume 13, Issue 4 - Jul 2004
Volume 13, Issue 3 - May 2004
Volume 13, Issue 2 - Mar 2004
Volume 13, Issue 1 - Jan 2004
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Acceleration Sensor Based Measurement and Noise Reduction of Dynamic Weights
Na, Seung-You ; Shin, Dae-Jung ;
Journal of Sensor Science and Technology , volume 13, issue 1, 2004, Pages 1~11
DOI : 10.5369/JSST.2004.13.1.001
Due to various types of errors added to dynamic weight measurement data, proper methods to reduce measurement errors are required to produce reliable weights. To cope with parasitic types of errors in real systems, information provided by the various sensors is utilized and combined in such a way to reduce the measurement errors of load cells. In addition to four channels of load cells from a trailer, an accelerometer is used to obtain the information to compensate the error induced from vertical movement of the vehicle due to the variation of ground level. A model trailer system is run to verify the effectiveness of the proposed method to reduce noise of dynamic weight measurements. Experiments show that the processed error magnitudes of less than 20 g can be obtained for 10 Kg experimental loads.
Design and Implementation of a Controllable White Noise Generator for Tinnitus Therapy
Yi, Gyu-Dong ; Lee, Jeong-Woo ; Song, Byung-Seop ; Lee, Sang-Heun ; Cho, Jin-Ho ; Kim, Myoung-Nam ;
Journal of Sensor Science and Technology , volume 13, issue 1, 2004, Pages 12~19
DOI : 10.5369/JSST.2004.13.1.012
The tinnitus which is the one of the auditory disease is a phenomenon that the patients feel the sound in the ear or the head when there is no sound sources. There have been many therapies for this tinnitus so far, but it is known that the TRT (Tinnitus Retraining Therapy) is the most effective therapy. So we designed and developed the controllable white noise generator for TRT. It must be designed as small as possible for user's convenience, such as the ITE (In The Ear) type hearing aids. It used the thermal noise as the white noise source. And filter and tone control circuits are used at the end of the noise generation part to control the white noise characteristics. This link of the controllable circuits is used to change the white noise's characteristic for the various tinnitus patients' characteristic. we can confirm that the designed and implemented controllable white noise generator which is a ITE type operates properly by the experiments of filter and tone control circuit.
Implementation of Motorized Wheelchair using Speaker Independent Voice Recognition Chip and Wireless Microphone
Song, Byung-Seop ; Lee, Jung-Hyun ; Park, Jung-Jae ; Park, Hee-Joon ; Kim, Myoung-Nam ;
Journal of Sensor Science and Technology , volume 13, issue 1, 2004, Pages 20~26
DOI : 10.5369/JSST.2004.13.1.020
For the disabled persons who can't use their limbs, motorized wheelchair that is activated by voice recognition module employing speaker independent method, was implemented. The wireless voice transfer device was designed and employed for the user convenience. And the wheelchair was designed to operate using voice and keypad by selection of the user because they can manipulate it using keypad if necessary. The speaker independent method was used as the voice recognition module in order that anyone can manipulate the wheelchair in case of assistance. Using the implemented wheelchair, performance and motion of the system was examined and it has over than 97% of voice recognition rate and proper movements.
Camera Calibration when the Accuracies of Camera Model and Data Are Uncertain
Do, Yong-Tae ;
Journal of Sensor Science and Technology , volume 13, issue 1, 2004, Pages 27~34
DOI : 10.5369/JSST.2004.13.1.027
Camera calibration is an important and fundamental procedure for the application of a vision sensor to 3D problems. Recently many camera calibration methods have been proposed particularly in the area of robot vision. However, the reliability of data used in calibration has been seldomly considered in spite of its importance. In addition, a camera model can not guarantee good results consistently in various conditions. This paper proposes methods to overcome such uncertainty problems of data and camera models as we often encounter them in practical camera calibration steps. By the use of the RANSAC (Random Sample Consensus) algorithm, few data having excessive magnitudes of errors are excluded. Artificial neural networks combined in a two-step structure are trained to compensate for the result by a calibration method of a particular model in a given condition. The proposed methods are useful because they can be employed additionally to most existing camera calibration techniques if needed. We applied them to a linear camera calibration method and could get improved results.
Fabrication and Characteristics of Chromel-Constantan Multijunction Thermal Converter with Evanohm R Alloy Heater
Lee, Young-Hwa ; Kwon, Sung-Won ; Kim, Kook-Jin ; Park, Se-Il ; Ihm, Young-Eon ;
Journal of Sensor Science and Technology , volume 13, issue 1, 2004, Pages 35~40
DOI : 10.5369/JSST.2004.13.1.035
A thin-film multijunction thermal converter was fabricated through the process using 6 inch silicon wafer semiconductor process and bulk micromachining. Evanohm R alloy and chromel-constantan were used as a heater and thermocouple materials, respectively. The temperature coefficient of resistance of Evanohm R heater was about 75.12 ppm/
and the voltage sensitivity of the thermal converter indicated about 5.75 mV/mW in air. The transfer differences, measured by FRDC-DC method in the frequency range from 20 Hz to 10 kHz, showed the value under about 1.36 ppm, 0.83 ppm for the film thickness of 500, 200 nm, respectively. And in case of a 200 nm-thick thermal converter, the AC-DC transfer differences seems to be stabilized below the value of 1 ppm in the frequency range from 1 kHz to 500 kHz.
Implementation of a Portable Electronic Nose System for Field Screening
Byun, Hyung-Gi ; Lee, Jun-Sub ; Kim, Jeong-Do ;
Journal of Sensor Science and Technology , volume 13, issue 1, 2004, Pages 41~46
DOI : 10.5369/JSST.2004.13.1.041
There is currently much interest in the development of instruments that emulate the senses of humans. Increasingly, there is demand for mimicking the human sense of smell, which is a sophisticated chemosensory system. An electronic nose system is applicable to a large area of industries including environmental monitoring. We have designed a protable electronic nose system using an array of commercial chemical gas sensors for recognizing and analyzing the various odours. In this paper, we have implemented a portable electronic nose system using an array of gas sensors for recognizing and analyzing VOCs (Volatile Organic Compounds) in the field. The accuracy of a portable electronic nose system may be lower than an instrument such as GC/MS (Gas Chromatography/Mass Spectrometer). However, a portable electronic nose system could be used on the field and showed fast response to pollutants in the field. Several different algorithms for odours recognition were used such as BP (Back-Propagation) or LM-BP (Levenberq-Marquardt Back-Propagation). We applied RBF (Radial Basis Function) Network for recognition and quantifying of odours, which has simpler and faster compared to the previously used algorithms such as BP and LM-BP.
Fabrication and Evaluation of Active Drug Delivery System Using Polypyrrole
Lee, Sang-Jo ; Lee, Seung-Ki ; Pak, James Jung-Ho ;
Journal of Sensor Science and Technology , volume 13, issue 1, 2004, Pages 47~55
DOI : 10.5369/JSST.2004.13.1.047
This paper presents drug release properties of active drug delivery system (DDS) using volume change of polypyrrole (PPy). The incorporation of various chemical substances into the PPy and controlling its release with the externally applied voltage to the PPy are possible. In order to confirm possibility for drug delivery system qualitatively, indicator(phenol red) was examined as a dopant of PPy. The applied voltage to the PPy electrode was set to -2 V and this negative voltage makes the anionic indicator released in saline solution. After qualitative analysis, in order to confirm quantitative drug release characteristic of PPy, salicylate which is one of the aspirin substance was used as a dopant of PPy. As a result, the salicylate release characteristics with time was thoroughly investigated while varying the electrode area, polymerization time, the applied voltage for drug release. Based on these quantitative results, a preliminary experiment was carried out to check the feasibility of the PPy applicable to the neuronal system.
Microcalcification Detection Based on Region Growing Method with Contrast and Edge Sharpness in Digital X-ray Mammographic Images
Won, C.H. ; Kang, S.W. ; Cho, J.H. ;
Journal of Sensor Science and Technology , volume 13, issue 1, 2004, Pages 56~65
DOI : 10.5369/JSST.2004.13.1.056
In this paper, we proposed the detection algorithm of microcalcification based on region growing method with contrast and edge sharpness in digital X-ray mammographic images. We extracted the local maximum pixel and watershed regions by using watershed algorithm. Then, we used the mean slope between local maximum and neighborhood pixels to extract microcalcification candidate pixels among local maximum pixels. During increasing threshold value to grow microcalcification region, at the maximum threshold value of the contrast and edge sharpness, the microcalcification area is decided. The regions of which area of grown candidate microcalfication region is larger than that of watershed region are excluded from microcalcifications. We showed the diagnosis algorithm can be used to aid diagnostic-radiologist in the early detection breast cancer.
Electrical and Structural Properties of ZnO:Pt Films Prepared by Ultrasonic Spray Pyrolysis
Ma, Tae-Young ; Park, Ki-Cheol ;
Journal of Sensor Science and Technology , volume 13, issue 1, 2004, Pages 66~71
DOI : 10.5369/JSST.2004.13.1.066
Pt-doped zinc oxide (ZnO:Pt) films were deposited by ultrasonic spray pyrolysis. Resistivity variation with Pt concentration was measured. The Pt distribution in ZnO:Pt films was studied through Auger Electron Spectroscopy (AES). The ZnO:Pt films were annealed in the ambient of air, water vapor and ozone, respectively. The variation in crystallographic properties and surface morphologies with respect to the annealing condition was observed by X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). The resistivity variation of the films with the annealing condition was measured. Finally, Atomic Force Microscopy (AFM) measurements were carried out to study the effects of the annealing on the roughness of ZnO:Pt films.
Micro-hole Fabrication of Glass Using Electro-chemical Discharge Method
Lee, Wang-Hoon ; Lee, Young-Tae ;
Journal of Sensor Science and Technology , volume 13, issue 1, 2004, Pages 72~77
DOI : 10.5369/JSST.2004.13.1.072
In this paper, we fabricated an apparatus of the electro-chemical discharge drilling for boring narrow through-hole into a glass. In the electrolyte, electro-chemical discharge creates high temperature condition by the electro-discharge energy. Therefore, glass are removed by the accelerated chemical reaction with glasses and chemicals in the high temperature condition. For optimization of the electro-chemical discharge drilling, the process condition was studied experimentally as a function of the electrolyte concentration, supply voltage and process time. The optimum condition was from DC25V to DC30V of applied voltage, 35 wt% NaOH solution.