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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 16, Issue 6 - Nov 2007
Volume 16, Issue 5 - Sep 2007
Volume 16, Issue 4 - Jul 2007
Volume 16, Issue 3 - May 2007
Volume 16, Issue 2 - Mar 2007
Volume 16, Issue 1 - Jan 2007
Selecting the target year
Design and fabrication of IEEE-802.15.4 protocol based universal sensor node platform with good extensity
Chung, Wan-Young ; Shin, Kwang-Sig ; Jang, Sung-Gyun ;
Journal of Sensor Science and Technology , volume 16, issue 4, 2007, Pages 247~253
DOI : 10.5369/JSST.2007.16.4.247
Low power consumption sensor network platform (sensor node) for sensor networking with IEEE 802.15.4 protocol was fabricated. The sensor node used ceramic bar type antenna for increasing RF signal performance and decreasing PCB size occupied by antenna. The communication range of the fabricated sensor node was about
m in open environment with 915 MHz frequency bandwidth and well supported by Tiny OS. The sensor node have good connectivity with various external devices by RS-232, I2C, analogue and digital expansion board, hence, this sensor node can be applied to various applications in wireless sensor network and ubiquitous sensor network.
Cure real monitering sensor for UV curable thin epoxy film based on side-polished single mode fiber
Kim, Kwang-Taek ; HwangBo, Sueng ; Kang, Yong-Chul ;
Journal of Sensor Science and Technology , volume 16, issue 4, 2007, Pages 254~258
DOI : 10.5369/JSST.2007.16.4.254
A novel cure sensor based on the side-polished single mode fiber has been proposed and demonstrated. Two different UV curable epoxies were used to verify the feasibility of the side-polished single mode fiber as a high sensitivity cure sensor. The volume change of the epoxy by UV curing results in a corresponding change of the refractive index. The sensor can be used to monitor the curing process, the refractive index variation and the volume change of epoxy in real time during the UV curing process. In addition, small birefringence of the epoxy film can be detected using the sensor.
Electrical characteristics of polycrystalline 3C-SiC thin film diodes
Chung, Gwiy-Sang ; Ahn, Jeong-Hak ;
Journal of Sensor Science and Technology , volume 16, issue 4, 2007, Pages 259~262
DOI : 10.5369/JSST.2007.16.4.259
This paper describes the electrical characteristics of polycrystalline (poly) 3C-SiC thin film diodes, in which poly 3C-SiC thin films on n-type and p-type Si wafers, respectively, were deposited by APCVD using HMDS,
, and Ar gas at
for 3 hr. The schottky diode with Au/poly 3C-SiC/Si (n-type) structure was fabricated. Its threshold voltage (
), breakdown voltage, thickness of depletion layer, and doping concentration (
) value were measured as 0.84 V, over 140 V, 61 nm, and
, respectively. Moreover, for the good ohmic contact, Al/poly 3C-SiC/Si (n-type) structure was annealed at 300, 400, and
, respectively for 30 min under the vacuum condition of
Torr. Finally, the p-n junction diodes fabricated on the poly 3C-Si/Si (p-type) were obtained like characteristics of single 3CSiC p-n junction diode. Therefore, poly 3C-SiC thin film diodes will be suitable for microsensors in conjunction with Si fabrication technology.
Resistive displacement transducer enhanced measurement resolution by electrical line contact
Kim, Kyung-Ah ; Choi, Seong-Su ; Cha, Eun-Jong ;
Journal of Sensor Science and Technology , volume 16, issue 4, 2007, Pages 263~269
DOI : 10.5369/JSST.2007.16.4.263
Although variable resistance displacement transducer is widely applied for its technical simplicity, electrical point contact limits measurement resolution (precision). The present study introduced roller shaped structure for electrical line contact. Proto-type transducer was developed and measurement characteristics were compared with a commercialized product. When the displacement was varied with steps of 5 mm, 1 mm, and down to 0.1 mm, the correlation coefficient between resistance and displacement decreased lower than 0.9 in the commercialized product while the proto-type transducer maintained values higher than 0.99. Therefore, the measurement resolution was enhanced by approximately 10 times. Since manufacturing also seemed easier, the present results would enable more accurate and less expensive manufacturing of variable resistance displacement transducer.
GPS-based real-time location-aware system in outdoor environment
Lau, Erin-Ee-Lin ; Shin, Kwang-Sig ; Chung, Wan-Young ;
Journal of Sensor Science and Technology , volume 16, issue 4, 2007, Pages 270~276
DOI : 10.5369/JSST.2007.16.4.270
A location-aware system, which is capable to detect a user`s whereabout in a region and provide real-time location information in outdoor environment is designed and fabricated, specifically using the GPS (global positioning system) as key technology in view of its stability and high precision in outdoor environment. Experiment is conducted to test this application in campus-based environment. Once GPS receiver detects specific location which is tagged with GPS coordinates, the system provides information relevant to that context and user can operate and react accordingly. Besides, this location-aware system is able to provide user with the route in order to get to a desired place by detecting the direction that the user is moving towards from his/her initial location. The mapping data is transferred via wireless LAN to PDA carried by the user as well as to the back-end system on real-time basis. The test result is analyzed and discussed to validate the effectiveness of using GPS in implementing this system and indicates future works that could be made to improve this prototype to be implemented in other applications, such as theme park, tourist attraction spot or recreational park.
A wireless sensor network approach to enable location awareness in ubiquitous healthcare applications
Singh, Vinay Kumar ; Lim, Hyo-Taek ; Chung, Wan-Young ;
Journal of Sensor Science and Technology , volume 16, issue 4, 2007, Pages 277~285
DOI : 10.5369/JSST.2007.16.4.277
In this paper, we outline the research issues that we are pursuing towards building of location aware environments for mainly ubiquitous healthcare applications. Such location aware application can provide what is happening in this space. To locate an object, such as patient or elderly person, the active ceiling-mounted reference beacons were placed throughout the building. Reference beacons periodically publish location information on RF and ultrasonic signals to allow application running on mobile or static nodes to study and determine their physical location. Once object-carried passive listener receives the information, it subsequently determines it`s location from reference beacons. The cost of the system was reduced while the accuracy in our experiments was fairly good and fine grained between 7 and 12 cm for location awareness in indoor environments by using only the sensor nodes and wireless sensor network technology. Passive architecture used here provides the security of the user privacy while at the server the privacy was secured by providing the authentication using Geopriv approach. This information from sensor nodes is further forwarded to base station where further computation is performed to determine the current position of object.
Development of walking assistance robot for the blind
Kang, Jeong-Ho ; Kim, Chang-Geol ; Lee, Seung-Ha ; Song, Byung-Seop ;
Journal of Sensor Science and Technology , volume 16, issue 4, 2007, Pages 286~293
DOI : 10.5369/JSST.2007.16.4.286
For safe walking of the people who are blind, walking assistance robot which can detecting and avoiding the obstacle was investigated. The implemented prototype walking assistance robot consists of a obstacle detecting module, a user interface using acoustic signal and a driving module. The obstacle detecting module uses 6 ultrasonic sensors those located at the front part of the robot can perceive the obstacle which is in 3 meter distances and
degrees. It calculates the distance and degree from the obstacle using TOF (time of flight) method and decides the 3-dimensional location of the obstacle. The obstacle information is delivered to the user using acoustic alarm and guide sound. The robot is designed to avoid by itself when the obstacle is detecting and the user only follows it to safe walking. After the designed robot was implemented, driving and obstacle detecting experiments were carried out. The result showed that the designed walking assistance robot will help the people who are blind to walk around safe.
Extended kalman filter design for autonomous navigation with GPS and INS sensor system fusion
Yun, Duk-Sun ; Yu, Hwan-Shin ;
Journal of Sensor Science and Technology , volume 16, issue 4, 2007, Pages 294~300
DOI : 10.5369/JSST.2007.16.4.294
Autonomous unmanned vehicle is able to find the path and the way point by itself. For the more precise navigation performance, Extended kalman filter, which is integrated with inertial navigation system and global positioning system is proposed in this paper. Extended kalman filter`s performance is evaluated by the simulation and applied to the unmanned vehicle. The test result shows the effectiveness of extended kalman filter for the navigation.
Optimum deposition conditions of AlN thin film on the Si substrate for SAW application
Ko, Bong-Chul ; Nam, Chang-Woo ;
Journal of Sensor Science and Technology , volume 16, issue 4, 2007, Pages 301~306
DOI : 10.5369/JSST.2007.16.4.301
AlN thin film for SAW filter application was deposited on (100) silicon wafers by reactive magnetron sputtering method. The structural characteristics were dependent on the deposition conditions such as sputtering pressure, RF power, substrate temperature, and nitrogen partial pressure. Scanning Electron Microscope (SEM), X-ray Diffraction (XRD), Electron Probe MicroAnalyzer (EPMA) and Atomic Force Microscope (AFM) have been used to find out structural properties and preferred orientation of AlN thin films. Insertion loss of SAW devices was 28.51 dB and out of band rejection was about 24 dB.
UV emission of ZnO:Er films prepared by ultrasonic spray pyrolysis
Choi, Mu-Hee ; Ma, Tae-Young ;
Journal of Sensor Science and Technology , volume 16, issue 4, 2007, Pages 307~312
DOI : 10.5369/JSST.2007.16.4.307
The films of Er-doped ZnO (ZnO:Er) were prepared onto MgO wafers by ultrasonic spray pyrolysis at
. The concentration of Er in the deposition source varied from 0.5 wt% to 3.0 wt%. The crystallographic properties and surface morphologies of the films were investigated by X-ray diffraction (XRD) and scanning electron microscope (SEM), respectively. The properties of photoluminescence (PL) for the films were investigated by dependence of PL spectra on the Er concentration in the films. The films were grown as polycrystalline with a dominant direction of . The grain size of the films were reduced by Er-doping. Er-doping enhanced the ultraviolet emission of ZnO:Er films. The ZnO:Er films prepared with the deposition source of 2.0 wt% Er showed the strongest ultraviolet light emission peak among the films in this study.
Properties of CNT field effect transistors using top gate electrodes
Park, Yong-Wook ; Yoon, Seok-Jin ;
Journal of Sensor Science and Technology , volume 16, issue 4, 2007, Pages 313~318
DOI : 10.5369/JSST.2007.16.4.313
Single-wall carbon nanotube field-effect transistors (SWCNT FETs) of top gate structure were fabricated in a conventional metal-oxide-semiconductor field effect transistor (MOSFET) with gate electrodes above the conduction channel separated from the channel by a thin
layer. The carbon nanotubes (CNTs) directly grown using thin Fe film as catalyst by thermal chemical vapor deposition (CVD). These top gate devices exhibit good electrical characteristics, including steep subthreshold slope and high conductance at low gate voltages. Our experiments show that CNTFETs may be competitive with Si MOSFET for future nanoelectronic applications.
Mechanical characteristics of polycrystalline 3C-SiC thin films using Ar carrier gas by APCVD
Han, Ki-Bong ; Chung, Gwiy-Sang ;
Journal of Sensor Science and Technology , volume 16, issue 4, 2007, Pages 319~323
DOI : 10.5369/JSST.2007.16.4.319
This paper describes the mechanical characteristics of poly 3C-SiC thin films grown on Si wafers with thermal oxide. In this work, the poly 3C-SiC thin film was deposited by APCVD method using only Ar carrier gas and single precursor HMDS at
. The elastic modulus and hardness of poly 3C-SiC thin films were measured using nanoindentation. Also, the roughness of surface was investigated by AFM. The resulting values of elastic modulus E, hardness H and the roughness of the poly 3C-SiC film are 305 GPa, 26 GPa and 49.35 nm respectively. The mechanical properties of the grown poly 3C-SiC film are better than bulk Si wafers. Therefore, the poly 3C-SiC thin film is suitable for abrasion, high frequency and MEMS applications.