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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 19, Issue 6 - Nov 2010
Volume 19, Issue 5 - Sep 2010
Volume 19, Issue 4 - Jul 2010
Volume 19, Issue 3 - May 2010
Volume 19, Issue 2 - Mar 2010
Volume 19, Issue 1 - Jan 2010
Selecting the target year
Characteristics of SAW humidity sensor using nanocrystalline ZnO films
Hong, Hoang-Si ; Chung, Gwiy-Sang ;
Journal of Sensor Science and Technology , volume 19, issue 5, 2010, Pages 337~341
DOI : 10.5369/JSST.2010.19.5.337
In this work, the nanocrystalline ZnO/polycrystalline(poly) aluminum nitride(AlN)/ Si-layered structure was fabricated for humidity sensor applications based on surface acoustic wave(SAW). The ZnO film was used as a sensitive material layer. The ZnO and AlN(0002) were deposited by a sol-gel process and a pulse reactive magnetron sputtering, respectively. The ZnO sensitive films coated on AlN have a hexagonal wurtzite structure after the thin films annealed at
. The surface of the film exhibits sponginess and a nanometer particle size(below 50 nm). The largest shift in the frequency response was at approximately 200 kHz(the relative humidity: 10 %~90 %) for the structure annealed at
. The effect of the change in the environmental temperature on the frequency response of the SAW humidity sensor was also investigated.
An energy efficient clustering scheme by adjusting group size in zigbee environment
Park, Jong-Il ; Lee, Kyoung-Hwa ; Shin, Yong-Tae ;
Journal of Sensor Science and Technology , volume 19, issue 5, 2010, Pages 342~348
DOI : 10.5369/JSST.2010.19.5.342
The wireless sensor networks have been extensively researched. One of the issues in wireless sensor networks is a developing energy-efficient clustering protocol. Clustering algorithm provides an effective way to extend the lifetime of a wireless sensor networks. In this paper, we proposed an energy efficient clustering scheme by adjusting group size. In sensor network, the power consumption in data transmission between sensor nodes is strongly influenced by the distance of two nodes. And cluster size, that is the number of cluster member nodes, is also effected on energy consumption. Therefore we proposed the clustering scheme for high energy efficiency of entire sensor network by controlling cluster size according to the distance between cluster header and sink.
Development of four-finger force measuring system of a cylindrical type
Kim, Gab-Soon ;
Journal of Sensor Science and Technology , volume 19, issue 5, 2010, Pages 349~355
DOI : 10.5369/JSST.2010.19.5.349
Stroke patients, etc. can't use their hands because of the paralysis of their fingers, and their fingers could be recovered by rehabilitating training. In order to judge the rehabilitating extent of their fingers, the patients should grasp a cylindrical object in hospital. At present, the used object in hospital is only a cylindrical object, and can't measure the force of fingers. Therefore, doctors judge the rehabilitating extent by touching and watching at their fingers. So, the four-finger force measuring system which can measure the force of their fingers should be developed. In this paper, four-finger force measuring system with four force sensors which can measure the grasping force is developed. The force sensors are designed and fabricated, and the force measuring device is designed and manufactured by using DSP(digital signal processing). Also, the grasping force test of men is performed by using the developed four-finger force measuring system. It was confirmed that the finger average force of right hand is about 214.6 N and that of left hand is about 212.8 N.
3-dimensional nanostructured ZnO gas sensor
Park, Yong-Wook ; Shin, Hyun-Yong ; Yoon, Seok-Jin ;
Journal of Sensor Science and Technology , volume 19, issue 5, 2010, Pages 356~360
DOI : 10.5369/JSST.2010.19.5.356
Due to the high surface-to-volume ratio, the 3-dimensional(3D) nanostructures of metal oxides are regarded as the best candidate materials for the chemical gas sensors. Here we have synthesised flower-like 3D zinc oxide nanostructures through a simple hydrothermal route. Specific surface area of the 3D zinc oxide nanostructures synthesised in different pH values from 9.0 to 12.0 were evaluated by using a BET analyzer and the results were compared with that of a zinc oxide thin film fabricated by rf sputtering. Using interdigitated electrodes, superior CO gas sensing properties of the 3D zinc oxide nanostructures on the ZnO thin film to those of the ZnO thin film were demonstrated.
Study on frequency response of implantable microphone and vibrating transducer for the gain compensation of implantable middle ear hearing aid
Jung, Eui-Sung ; Seong, Ki-Woong ; Lim, Hyung-Gyu ; Lee, Jang-Woo ; Kim, Dong-Wook ; Lee, Jyung-Hyun ; Kim, Myoung-Nam ; Cho, Jin-Ho ;
Journal of Sensor Science and Technology , volume 19, issue 5, 2010, Pages 361~368
DOI : 10.5369/JSST.2010.19.5.361
ACROSS device, which is composed of an implantable microphone, a signal processor, and a vibrating transducer, is a fullyimplantable middle ear hearing device(F-IMEHD) for the recovery of patients with hearing loss. And since a microphone is implanted under skin and tissue at the temporal bones, the amplitude of the sound wave is attenuated by absorption and scattering. And the vibrating transducer attached to the ossicular chain caused also the different displacement from characteristic of the stapes. For the gain control of auditory signals, most of implantable hearing devices with the digital audio signal processor still apply to fitting rules of conventional hearing aid without regard to the effect of the implanted microphone and the vibrating transducer. So it should be taken into account the effect of the implantable microphone and the vibrating transducer to use the conventional audio fitting rule. The aim of this study was to measure gain characteristics caused by the implanted microphone and the vibrating transducer attached to the ossicle chains for the gain compensation of ACROSS device. Differential floating mass transducers (DFMT) of ACROSS device were clipped on four cadaver temporal bones. And after placing the DFMT on them, displacements of the ossicle chain with the DFMT operated by 1
current was measured using laser Doppler vibrometer. And the sensitivity of microphones under the sampled pig skin and the skin of 3 rat back were measured by stimulus of pure tones in frequency from 0.1 to 8.9 kHz. And we confirmed that the microphone implanted under skin showed poorer frequency response in the acoustic high-frequency band than it in the low- to mid- frequency band, and the resonant frequency of the stapes vibration was changed by attaching the DFMT on the incus, the displacement of the DFMT driven with 1
was higher by the amount of about 20 dB than that of cadaver's stapes driven by the sound presssure of 94 dB SPL in resonance frequency range.
An efficient cluster header election scheme considering distancefrom upper node in zigbee environment
Park, Jong-Il ; Lee, Kyoung-Hwa ; Shin, Yong-Tae ;
Journal of Sensor Science and Technology , volume 19, issue 5, 2010, Pages 369~374
DOI : 10.5369/JSST.2010.19.5.369
It is important to efficiently elect the cluster header in Hierarchical Sensor Network, because it largely affects on the lifetime of the network. Therefore, recent research is focused on the lifetime extension of the whole network for efficient cluster header election. In this paper, we propose the new Cluster Header Election Scheme in which the cluster is divided into Group considering Distance from Upper Node, and a cluster header will be elected by node density of the Group. Also, we evaluate the performance of this scheme, and show that this proposed scheme improves network lifetime in Zigbee environment.
Car transmission shaft distortion correction system based on adaptive PID controller using displacement sensors
Choi, Sang-Bok ; Ban, Sang-Woo ; Kim, Ki-Taeg ;
Journal of Sensor Science and Technology , volume 19, issue 5, 2010, Pages 375~384
DOI : 10.5369/JSST.2010.19.5.375
In this paper, we proposed a new shaft distortion correction system having an adaptive PID controller using displacement sensors, which is adaptively reflecting variations of shaft strength owing to irregular heat treatment during an annealing process and sensitivity to the seasonal temperature changes. Generally, the shafts are annealed by heat treatment in order to enlarge the strength of the shaft, which causes an distortion of a shaft such as irregular bending of the shaft. In order to correct such a distortion of the shaft, a mechanical pressure is properly impacted to the distorted shaft. However, the strength of every shaft is different from each other owing to irregular annealing and seasonal temperature changes. Especially, the strength of a thin shaft such as a car transmission shaft is much more sensitive than that of a thick shaft. Therefore, it is very important for considering the strength of each shaft during correction of the car transmission shaft distortion in order to generate proper mechanical pressure. The conventional PID controller for the shaft distortion correction system does not consider each different strength of each shaft, which causes low productivity. Therefore, we proposed a new PID controller considering variations of shaft strength caused by seasonal temperature changes as well as irregular heat treatment and different cooling time. Three displacement sensors are used to measure a degree of distortion of the shaft at three different location. The proposed PID controller generates adaptively different coefficients according to different strength of each shaft using appropriately obtained pressure times from long-term experiments. Consequently, the proposed shaft distortion correction system increases the productivity about 30 % more than the conventional correction system in the real factory.
The CO sensing properties of thick film gas sensor using Co
powders prepared by hydrothermal reaction method
Kim, Kwang-Hee ; Kim, Jeong-Gyoo ; Park, Ki-Cheol ;
Journal of Sensor Science and Technology , volume 19, issue 5, 2010, Pages 385~390
DOI : 10.5369/JSST.2010.19.5.385
CO sensing thick film gas sensors using
powders prepared by hydrothermal reaction method, were fabricated, and their structural, electrical and CO gas sensing properties were investigated. The specific surface area of the
powders obtained from BET analysis was about 79.0
. XRD and SEM results show that the thick films heat-treated at
for 30 min after screen printing had the preferred orientation of (311) direction and the crystalline size was calculated to 221
. The maximum activation energy obtained from the temperature-resistance characteristics was 3.11 eV in the temperature range of
. The sensitivity to 1,000 ppm CO was about 150 %. The specific surface area, crystalline size, and maximum activation energy were increased significantly and the sensitivity for CO gas was improved largely.
Design & implementation of differential sensor using electrostatic capacitance method for detecting Ringer's solution exhaustion
Sim, Yo-Sub ; Kim, Cheong-Worl ;
Journal of Sensor Science and Technology , volume 19, issue 5, 2010, Pages 391~397
DOI : 10.5369/JSST.2010.19.5.391
This paper proposes a differential structure sensor for detecting Ringer's solution exhaustion, in which three C-type electrodes of 10 mm width are disposed on a ringer hose at a distance of 5 mm each other in the direction of Ringer's solution flow. In the center of middle electrode, two capacitances are formed at the proposed sensor. When ringer hose is filled with Ringer's solution, there is no difference between two capacitances. But capacitance difference exist under the Ringer's solution shortage, because the shortage causes the hose filled with air from the top position electrode. The capacitance difference got to maximum 1.81 pF, when air was filled between top and middle electrode and the last of hose was filled with 10 % dextrose injection Ringer's solution. The capacitance difference varied with hose-wraparound coverage of electrodes as well as the width of them. For hose-wraparound electrode coverage of 90 % and 70 %, the maximum capacitance difference was 1.81 pF and 1.56 pF, respectively. A differential charge amplifier converted the capacitance difference to electric signal, and minimized electrodes' adhering problem and external noise coupling problem.
Effect of Hg-ambient annealing on Hg
Te thin films for IR detector
Kim, Kwang-Chon ; Lee, Cha-Hyun ; Choi, Won-Chel ; Kim, Hyun-Jae ; Kim, Jin-Sang ;
Journal of Sensor Science and Technology , volume 19, issue 5, 2010, Pages 398~402
DOI : 10.5369/JSST.2010.19.5.398
The liquid phase epitaxy(LPE) method was widely used to growth of mercury cadmium telluride(MCT) thin films. However, this method lead to Hg-vacancies in MCT thin film, because Hg has high vapor pressure at this temperature range. This is a well known defect in HgCdTe grown by LPE method. In this study, we report the development of techniques for improving the crystalline quality and controlling the composite uniformity of HgCdTe thin films using high- pressure Hg-ambient annealing method. As a result, we achieved the improvement of the composite uniformity of HgCdTe thin films. It was observed by the high angle annular dark field scanning TEM(HAADF-STEM) analysis. Moreover, new HgTe phase and a shrinking of lattice fringe were observed.