Go to the main menu
Skip to content
Go to bottom
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 10, Issue 6 - Nov 2001
Volume 10, Issue 5 - Sep 2001
Volume 10, Issue 4 - Jul 2001
Volume 10, Issue 3 - May 2001
Volume 10, Issue 2 - Mar 2001
Volume 10, Issue 1 - Jan 2001
Selecting the target year
Special Issure for the 10 th Anniversary : Retrospect on Foundation of Korean Sensors Society
Journal of Sensor Science and Technology , volume 10, issue 5, 2001, Pages 273~273
An implementation of NDIR type
gas sample chamber and measuring hardware for capnograph system in consideration of the time response characteristics
Park, I.Y. ; Lee, I.K. ; Lee, S.K. ; Kang, K.M. ; Kang, S.W. ; Cho, J.H. ;
Journal of Sensor Science and Technology , volume 10, issue 5, 2001, Pages 279~285
The capnograph system for determining the partial pressure of carbon dioxide in the blood of a patient was developed based on the NDIR(non-dispersive infrared) absorption technology. NDIR gas analyzing method requires an optical absorption chamber and signal processing hardware. In this paper, we have designed and implemented NDIR type
gas chamber in consideration of the time response characteristics and lamp chopping frequency. And we have implemented signal processing hardware using two infrared sources to reduce the thermal background effect. The implemented gas chamber and signal processing hardware were tested in the temperature variation experiment and human expiratory experiment. The results showed that the system could produce a stable output signal and a good
gas concentration curve like a typical capnogram.
Implementation of saliency map model using independent component analysis
Sohn, Jun-Il ; Lee, Min-Ho ; Shin, Jang-Kyoo ;
Journal of Sensor Science and Technology , volume 10, issue 5, 2001, Pages 286~291
We propose a new saliency map model for selecting an attended location in an arbitrary visual scene, which is one of the most important characteristics of human vision system. In selecting an attended location, an edge information can be considered as a feature basis to construct the saliency map. Edge filters are obtained from the independent component analysis(ICA) that is the best way to find independent edges in natural gray scenes. In order to reflect the non-uniform density in our retina, we use a multi-scaled pyramid input image instead of using an original input image. Computer simulation results show that the proposed saliency map model with multi-scale property successfully generates the plausible attended locations.
Fabrication and packaging of the vacuum magnetic field sensor
Park, Heung-Woo ; Park, Yun-Kwon ; Lee, Duck-Jung ; Kim, Chul-Ju ; Park, Jung-Ho ; Oh, Myung-Hwan ; Ju, Byeong-Kwon ;
Journal of Sensor Science and Technology , volume 10, issue 5, 2001, Pages 292~303
This work reports the tunneling effects of the lateral field emitters. Tunneling effect is applicable to the VMFS(vacuum magnetic field sensors). VMFS uses the fact that the trajectory of the emitted electrons are curved by the magnetic field due to Lorentz force. Polysilicon was used as field emitters and anode materials. Thickness of the emitter and the anode were
, respectively. PSG(phospho-silicate-glass) was used as a sacrificial layer and it was etched by HF at a releasing step. Cantilevers were doped with
-thick cantilevers were fabricated onto PSG(
-thick). Sublimation drying method was used at releasing step to avoid stiction. Then, device was vacuum sealed. Device was fixed to a sodalime-glass #1 with silver paste and it was wire bonded. Glass #1 has a predefined hole and a sputtered silicon-film at backside. The front-side of the device was sealed with sodalime-glass #2 using the glass frit. After getter insertion via the hole, backside of the glass #1 was bonded electrostatically with the sodalime-glass #3 at
. After sealing, getter was activated. Sealing was successful to operate the tunneling device. The packaged VMFS showed very small reduced emission current compared with the chamber test prior to sealing. The emission currents were changed when the magnetic field was induced. The sensitivity of the device was about 3%/T at about 1 Tesla magnetic field.
Wet-etching Properties of GaAs Using
Mixed Solution and Its Application to Fabrication Method for Released GaAs Microstructures with Rectangular Cross Section
Kim, Jong-Pal ; Park, Sang-Jun ; Paik, Seung-Joon ; Kim, Se-Tae ; Koo, Chi-Wan ; Lee, Seung-Ki ; Cho, dong-Il ;
Journal of Sensor Science and Technology , volume 10, issue 5, 2001, Pages 304~313
In this research, we investigate wet-etching properties of GaAs in
, and develop the fabrication method of GaAs microstructures with rectangular cross section using (001) GaAs substrate. For obtaining wet-etching properties with respect to crystallographic orientation, the etch rates and cross-section etch profiles of (001) GaAs with 16 different compositions and the undercut rates with 5 different compositions are measured using
mixed solutions. From these experimental data, a new GaAs micromachining method in bulk (001) GaAs is proposed, and used to fabricate a released microbridges with a rectangular cross section. The developed GaAs micromachining method can be very useful for low-loss, highly-tunable capacitors for RF components and for integration with GaAs optical components.
Measurement of Absorbed Dose for High Energy Electron using
Park, Myeong-Hwan ; Kim, Do-Sung ; Doh, Sih-Hong ; Kim, Wan ; Kang, Hee-Dong ;
Journal of Sensor Science and Technology , volume 10, issue 5, 2001, Pages 314~319
In this study, the highly sensitive
:Tm-PTFE TLDs has been fabricated for the purpose of measurement of high energy electron.
:Tm phosphor powder was mixed with polytetrafluoroethylene(PTFE) powder and moulded in a disk type(diameter 8.5mm, thickness
) by cold pressing. The batch uniformities were average deviation 3.1%. The TLDs were applied to measurement of absorbed dose distribution for high energy electron, the ranges were determined to be
, respectively. The beam flatness were 4.5% as the variation of dose relative to the central axis over the central 80% of the field size at a maximum dose depth in a plane perpendicular to the central axis.
Fabrication of Two-Dimensional Array Hydrophones and Application to Ultrasonic Field Measurement
Ha, Kang-Lyeol ; Kim, Moo-Joon ; Kang, Gab-Joong ; Hyun, Byung-Gook ; Chae, Min-Ku ; Imano, Gazuhiko ;
Journal of Sensor Science and Technology , volume 10, issue 5, 2001, Pages 320~328
Two-dimensional array hydrophones with
elements were designed and fabricated using the PVDF(Polyvinylidene fluoride) piezoelectric film, and the method and system for ultrasonic field measurement in several MHz
tens of MHz band using the hydrophones was established. The characteristics of frequency response relating to the backing materials were analyzed with the Mason equivalent circuit for design, and the accuracy of ultrasonic field measurement relating to the sizes and kerfs of piezoelectric elements was discussed. Good results of the measurement of ultrasonic field formed by a circular plane transducer of 2.25MHz in water were obtained by the system with the array hydrophones.
Steering Control and Geomagnetism Cancellation for an Autonomous Vehicle using MR Sensors
Kim, Hong-Reol ; Son, Seok-Jun ; Kim, Tae-Gon ; Kim, Jeong-Heui ; Lim, Young-Cheol ; Kim, Eui-Sun ; Chang, Young-Hak ;
Journal of Sensor Science and Technology , volume 10, issue 5, 2001, Pages 329~336
This paper describes the steering control and geomagnetism cancellation for an autonomous vehicle using an MR sensor. The magneto-resistive (MR) sensor obtains the vector summation of the magnetic fields from embedded magnets and the Earth. The vehicle is controlled by the magnetic fields from embedded magnets. So, geomagnetism is the disturbance in the steering control system. In this paper, we propose a new method of the sensor arrangement in order to remove the geomagnetism and vehicle body interference. The proposed method uses two MR sensors located in a level plane and the steering controller has been developed. The controller has three input variables (
) using the measured magnetic field difference, and an output variable (the steering angle). A simulation program was developed to acquire the data to teach the neural network, in order to test the ability of a neural network to learn the steering control process. Also, the computer simulation of the vehicle (including vehicle dynamics and steering) was used to verify the steering performance of the vehicle controller using the neural network. From the simulation and field test, good result was obtained and we confirmed the robustness of the neural network controller in a real autonomous vehicle.
Flip Chip Bonder for Automactic Parallel Aligning of IR Sensors and Read Out Integrated Circuits
Suh, Sang-Hee ; Kim, Jin-Sang ; An, Se-Young ;
Journal of Sensor Science and Technology , volume 10, issue 5, 2001, Pages 337~342
Infrared sensors with one or two dimensional arrays are usually bonded via indium bumps to Si CMOS read out circuits. Therefore, both sensing of infrared beams and processing of signals are performed at the focal plane. This gives us a benefit of reducing noise as well as size of infrared detectors. We have developed a way of boding indium bumps with keeping sensor and ROIC parallel to each other. The flip chip bonder developed has a very simple structure and is easy to operate. So we expect that reliability will be improved very much.