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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 22, Issue 6 - Nov 2013
Volume 22, Issue 5 - Sep 2013
Volume 22, Issue 4 - Jul 2013
Volume 22, Issue 3 - May 2013
Volume 22, Issue 2 - Mar 2013
Volume 22, Issue 1 - Jan 2013
Selecting the target year
Carbon-Nanotube-Modified Glass Micropipette for Simultaneous Drug Injection and Neural Monitoring
Shin, Jung Hwal ; Kim, Geon Hwee ; Kim, Intae ; Lim, Hoon ; Lim, Geunbae ;
Journal of Sensor Science and Technology , volume 22, issue 5, 2013, Pages 309~314
DOI : 10.5369/JSST.2013.22.5.309
Glass micropipettes are widely used for drug injection in neurological studies. To enable these devices to monitor neural activity simultaneously with drug injection, an electrode such as Ag/AgCl must be located near or inserted into the glass micropipette to detect electrical signals in vivo. Here, we report carbon-nanotube-modified glass micropipettes (CNGs), which have excellent electrochemical properties such as low impedance and large electrochemical surface area suited for neural recording. In addition, using a standard pressure pump, CNGs can deliver drugs to the target region without bending. Because they are based on standard glass micropipettes, CNGs can readily be applied to traditional equipment, creating opportunities to monitor precisely the drug-injected area.
Strain-Sensing Characteristics of Multi-Walled Carbon Nanotube Sheet
Jung, Daewoong ; Lee, Gil S. ;
Journal of Sensor Science and Technology , volume 22, issue 5, 2013, Pages 315~320
DOI : 10.5369/JSST.2013.22.5.315
In this paper, the properties of strain sensors made of spin-capable multi-walled carbon nanotubes (MWCNTs) were characterized and their sensing mechanisms analyzed. The key contribution of this paper is a new fabrication technique that introduces a simpler transfer method compared to spin-coating or dispersion CNT. Resistance of the MWCNT sheet strain sensor increased linearly with higher strain. To investigate the effect of CNT concentration on sensitivity, two strain sensors with different layer numbers of MWCNT sheets (one and three layers) were fabricated. According to the results, the sensor with a three-layer sheet showed higher sensitivity than that with one layer. In addition, experiments were conducted to examine the effects of environmental factors, temperature, and gas on sensor sensitivity. An increase in temperature resulted in a reduction in sensor sensitivity. It was also observed that ambient gas influenced the properties of the MWCNT sheet due to charge transfer. Experimental results showed that there was a linear change in resistance in response to strain, and the resistance of the sensor fully recovered to its unstressed state and exhibited stable electromechanical properties.
Silicon Strain Gauge Load Cell for Weighting Disdrometer
Lee, Seon-Gil ; Moon, Young-Soon ; Son, Won-Ho ; Sohn, Young-Ho ; Choi, Sie-Young ;
Journal of Sensor Science and Technology , volume 22, issue 5, 2013, Pages 321~326
DOI : 10.5369/JSST.2013.22.5.321
In this paper, the usability of a compact silicon strain gauge load cell in a weighting disdrometer for measuring the impact load of a falling raindrop is introduced for application in a multi-meteorological sensor. The silicon strain gauge load cell is based on the piezoresistive effect, which has a high linearity output from the momentum of the raindrop and the simplicity of signal processing. The weighting disdrometer shows a high sensitivity of 7.8 mV/g in static load measurement when the diaphragm thickness of the load cell is
NiO Films Formed at Room Temperature for Microbolometer
Jung, Young-Chul ; Koo, Gyohun ; Lee, Jae-Sung ; Hahm, Sung-Ho ; Lee, Yong Soo ;
Journal of Sensor Science and Technology , volume 22, issue 5, 2013, Pages 327~332
DOI : 10.5369/JSST.2013.22.5.327
Nickel oxide films using RF sputter was formed on the
substrate at the room temperature controlled with water circulation system. The feasibility of nickel oxide film as a bolometric material was demonstrated. GIXRD spectrum on NiO(111), NiO(200), and NiO(220) orientation expected as the main peaks were appeared in the grown nickel oxide films. The typical resistivity acquired at the RF power of 100W was about
. And it was reduced to
according to the increase of the RF power to 400W. The TCR of fabricated micro-bolometer with the resistivity of
. The characteristics of fabricated nickel oxide film and micro-bolometer were analyzed with XRD pattern, resistivity, TCR, and SEM images.
A Simple Plane-Shaped Micro Stator Using Silicon Substrate Mold and Enamel Coil
Choi, Ju Chan ; Choi, Young Chan ; Jung, Dong Geun ; Lee, Jae Yun ; Min, Seong Ki ; Kong, Seong Ho ;
Journal of Sensor Science and Technology , volume 22, issue 5, 2013, Pages 333~337
DOI : 10.5369/JSST.2013.22.5.333
This study proposes a simply fabricated micro stator for higher output power than previously reported micro stators. The stator has been fabricated by inserting enamel coil in silicon mold formed by micro etching process. The most merits of the proposed micro stator are the simple fabrication process and high output power. Previously reported micro stators have high resistance because the micro coil is fabricated by relatively thin-film-based deposition process such as sputtering and electroplating. In addition, the previously reported micro coil has many electrical contact points for forming the coil structure. These characteristics of the micro stator can lead to low performance in output power. However, the proposed micro stator adopts commercially available enamel coil without any contact point. Therefore, the enamel coil of the proposed micro stator has low junction resistance due to the good electrical quality compared with the deposited or electroplated metal coil. Power generation tests were performed and the fabricated stator can produce 5.4 mW in 4000 RPM,
and 0.3 mm gap. The proposed micro stator can produce larger output power than the previously reported stator spite of low RPM and the larger gap between the permanent magnet and the stator.
PVC Classification Algorithm Through Efficient R Wave Detection
Cho, Ik-Sung ; Kwon, Hyeog-Soong ;
Journal of Sensor Science and Technology , volume 22, issue 5, 2013, Pages 338~345
DOI : 10.5369/JSST.2013.22.5.338
Premature ventricular contractions are the most common of all arrhythmias and may cause more serious situation like ventricular fibrillation and ventricular tachycardia in some patients. Therefore, the detection of this arrhythmia becomes crucial in the early diagnosis and the prevention of possible life threatening cardiac diseases. Most methods for detecting arrhythmia require pp interval, or the diversity of P wave morphology, but they are difficult to detect the p wave signal because of various noise types. Thus, it is necessary to use noise-free R wave. So, the new approach for the detection of PVC is presented based on the rhythm analysis and the beat matching in this paper. For this purpose, we removed baseline wandering of low frequency band and made summed signals that are composed of two high frequency bands including the frequency component of QRS complex using the wavelet filter. And then we designed R wave detection algorithm using the adaptive threshold and window through RR interval. Also, we developed algorithm to classify PVC using RR interval. The performance of R wave and PVC detection is evaluated by using MIT-BIH arrhythmia database. The achieved scores indicate average detection rate of 99.76%, sensitivity of 99.30% and specificity of 98.66%; accuracy respectively for R wave and PVC detection.
Organophosphorus Compounds Detection Using Suspended SWNT Films
Kim, Intae ; An, Taechang ; Lim, Geunbae ;
Journal of Sensor Science and Technology , volume 22, issue 5, 2013, Pages 346~351
DOI : 10.5369/JSST.2013.22.5.346
We developed a one-step method for fabrication of addressable suspended SWNT films and demonstrate excellent detection performance of paraoxon based on OPH-immobilized SWNT films for environmental monitoring. For dispersed SWNT suspension, COOH-SWNT was prepared by the oxidation of carbon nanotubes using acid treatment and sonication. Suspended SWNT-film was fabricated between cantilever electrodes by dielectrophoretic force and surface tension of the water meniscus. After that, OPH were immobilized on suspended SWNT-films by nonspecific binding for enzymatic hydrolysis of paraoxon. The electrical properties of the SWNT films were measured in real time at room temperature. Structurally suspended SWNT films from substrate surface made possible rapid and highly sensitive detection of target molecules with increased convectional and diffusional fluxes of the molecules and with a large binding surface area. SWNT film FET resulted in a real-time, label-free, and electrical detection of paraoxon to the concentration of ca.
with a step-wise rapid response time of several seconds.
Fabrication of PDMS Lens Using Photolithography and Water Droplet Mold
Kim, Jin Young ; Sung, Jungwoo ; Cho, Seong J. ; Kim, Chulhong ; Lim, Geunbae ;
Journal of Sensor Science and Technology , volume 22, issue 5, 2013, Pages 352~356
DOI : 10.5369/JSST.2013.22.5.352
We developed a novel fabrication method of polydimethylsioxane (PDMS) lens, which can easily control the shapes of the lens using soft lithography with common photolithography and water droplet molding. A mold for PDMS lens was prepared by patterning of hydrophobic photoresist on the hydrophilic substrate and dispensing small water droplets onto the predefined hydrophilic patterns. The size of patterns determined the dimension of the lens and the dispensed volume of the water droplet decided the radius of curvature of the PDMS lens independently. The water droplet with photoresist pattern played a robustly fixed mold for lens due to difference in wettability. The radius of curvature could be calculated theoretically because the water droplets could approximate spherical cap on the substrate. Finally, concave and convex PDMS lenses which could reduce or magnify optically were fabricated by curing of PDMS on the prepared mold. The measured radii of the fabricated PDMS lenses were well matched with the estimated values. We believe that our simple and efficient fabrication method can be adopted to PDMS microlens and extended to micro optical device, lab on a chip, and sensor technology.
Fabrication of Polyimide Film Electrode by Laser Ablation and Application for Electrochemical Glucose Biosensor
Park, Deog-Su ;
Journal of Sensor Science and Technology , volume 22, issue 5, 2013, Pages 357~363
DOI : 10.5369/JSST.2013.22.5.357
An ultraviolet pulsed laser ablation of polyimide film coated with platinum has been used to enhance the sensitivity for the application as an electrochemical biosensor. Densely packed cones are formed on polyimide surface after UV irradiation which results in increase of surface area. In order to apply the sensitivity improvement of laser ablated polyimide film electrodes, the glucose oxidase modified biosensor was fabricated by using an encapsulation in the gel matrix through sol-gel transition of tetraethoxysliane on the surface of laser ablated polyimide film. The optimum conditions for glucose determination have been characterized with respect to the applied potential and pH. The linear range and detection limit of glucose detection were from 2.0 mM to 18.0 mM and 0.18 mM, respectively. The sensitivity of glucose biosensors fabricated with laser ablated polyimide film is about three times higher than that of plain polyimide film due to increase in surface area by laser ablation.
Application and Verification of Fully-Integrated Design Environment for Piezoelectric Energy Harvester
Liu, Jian ; Welham, Chris ; Han, Seungoh ;
Journal of Sensor Science and Technology , volume 22, issue 5, 2013, Pages 364~368
DOI : 10.5369/JSST.2013.22.5.364
Vibrational energy harvester based on piezoelectricity has been expected to be the dominant energy harvesting technology due to the advantages of high conversion efficiency, light weight and small size, night operation, etc. Its commercialization is just around the corner but the integration with power management electronics should be solved in advance. In this paper, therefore, fully-integrated design environment for piezoelectric energy harvesting systems is presented to assist co-design with the power management electronics. The proposed design environment is capable of analyzing the energy harvester including the package-induced damping effects and simulating the device and its power management electronics simultaneously. When the developed design environment was applied to the fabricated device, the simulated resonant frequency matched well with the experimental result with a difference of 2.97% only. Also, the complex transient response was completed in short simulation time of 3,001 seconds including the displacement distribution over the device geometry. Furthermore, a full-bridge power management circuit was modeled and simulated with the energy harvester simultaneously. Therefore the proposed, fully-integrated design environment is accurate and fast enough for the contribution on successful commercialization of piezoelectric energy harvester.
Development of a Contact Type Temperature Sensor Using Single Crystal Silicon Thermopile
Lee, Young-Tae ; Lee, You-Na ; Lee, Wang-Hoon ;
Journal of Sensor Science and Technology , volume 22, issue 5, 2013, Pages 369~373
DOI : 10.5369/JSST.2013.22.5.369
In this paper, we developed contact type temperature sensor with single crystal silicon strip thermopile. This sensor consists of 15 p-type single crystal silicon strips, 17 n-types and contact electrodes on silicon dioxide silicon membrane. The result of electromotive force measuring showed very good characteristic as
when temperature difference between the two ends of the thermopile occurs by applying thermal contact on the thermopile which was fabricated with silicon strip of
Elastic Buffer Layer Coupled Micro Probe
Choi, Ju Chan ; Choi, Young Chan ; Jung, Dong Geon ; Kong, Seong Ho ;
Journal of Sensor Science and Technology , volume 22, issue 5, 2013, Pages 374~378
DOI : 10.5369/JSST.2013.22.5.374
In this paper, a new structure of probe unit is designed and fabricated with PDMS, which is well-known elastic material, as a buffer layer for increasing overdrive force and mechanical strength. In general, PDMS is widely used as actuation material due to its elasticity and compatibility of fabrication process. In this work, PDMS layer is chosen for mechanical elasticity of the proposed probe unit. We achieved the high overdrive force by placing PDMS buffer layer under the silicon based cantilever due to its elasticity. Moreover, the relation between prove length and overdrive force was measured by experiment in this work. Therefore, the various specifications of the micro prove unit can be designed by using the results of this work.