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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Sensor Science and Technology
Journal Basic Information
Journal DOI :
The Korean Sensors Society
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Volume & Issues
Volume 25, Issue 4 - Jul 2016
Volume 25, Issue 3 - May 2016
Volume 25, Issue 2 - Mar 2016
Volume 25, Issue 1 - Jan 2016
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Signal Processing Techniques Based on Adaptive Radial Basis Function Networks for Chemical Sensor Arrays
Byun, Hyung-Gi ;
Journal of Sensor Science and Technology , volume 25, issue 3, 2016, Pages 161~172
DOI : 10.5369/JSST.2016.25.3.161
The use of a chemical sensor array can help discriminate between chemicals when comparing one sample with another. The ability to classify pattern characteristics from relatively small pieces of information has led to growing interest in methods of sensor recognition. A variety of pattern recognition algorithms, including the adaptive radial basis function network (RBFN), may be applicable to gas and/ or odor classification. In this paper, we provide a broad review of approaches for various types of gas and/or odor identification techniques based on RBFN and drift compensation techniques caused by sensor poisoning and aging.
Comparison of the Power Consumption between the Ceramic and Wire Bonding Packaging Methods for Solid State Electrochemical Carbon dioxide Sensors
Kim, Tae Wan ; Park, Chong-Ook ;
Journal of Sensor Science and Technology , volume 25, issue 3, 2016, Pages 173~177
DOI : 10.5369/JSST.2016.25.3.173
Tape casting ceramics technology has been adopted for the fabrication of solid state electrochemical
sensors and the packaging substrates. The fabricated
sensors exhibit a fast response and a good recovery with the almost theoretical sensitivity of 37 mV/decade, corresponding to a sensor operating temperature of 373 K. The two packaging methods, the wire bonding package and the surface- mounted on the ceramic package, were compared with respect to their power consumption and mass production feasibility. In terms of the ease of fabrication, the surface mount packaging technology is superior to the wire bonding technology but its power consumption is approximately twice that of the wired package.
Design of Metal Oxide Hollow Structures Using Soft-templating Method for High-Performance Gas Sensors
Shim, Young-Seok ; Jang, Ho Won ;
Journal of Sensor Science and Technology , volume 25, issue 3, 2016, Pages 178~183
DOI : 10.5369/JSST.2016.25.3.178
Semiconductor gas sensors based on metal oxide are widely used in a number of applications, from health and safety to energy efficiency and emission control. Nanomaterials including nanowires, nanorods, and nanoparticles have dominated the research focus in this field owing to their large number of surface sites that facilitate surface reactions. Recently, metal oxide hollow structures using soft templates have been developed owing to their high sensing properties with large-area uniformity. Here, we provide a brief overview of metal oxide hollow structures and their gas-sensing properties from the aspects of template size, morphology, and additives. In addition, a gas-sensing mechanism and perspectives are presented.
Metal Oxide Nanocolumns for Extremely Sensitive Gas Sensors
Song, Young Geun ; Shim, Young-Seok ; Han, Soo Deok ; Lee, Hae Ryong ; Ju, Byeong-Kwon ; Kang, Chong Yun ;
Journal of Sensor Science and Technology , volume 25, issue 3, 2016, Pages 184~188
DOI : 10.5369/JSST.2016.25.3.184
and NiO nanocolumns have been successfully achieved by glancing-angle deposition (GLAD) using an electron beam evaporator. Nanocolumnar
and NiO sensors exhibited high performance owing to the porous nanostructural effect with the formation of a double Schottky junction and high surface-to-volume ratios. When all gas sensors were exposed to various gases such as
, the response of the highly ordered
nanocolumn were over 50 times higher than that of the
thin film. This work will bring broad interest and create a strong impact in many different fields owing to its particularly simple and reliable fabrication process.
A Visible Light Communication Repeater Using an LED Lamp
Lee, Seong-Ho ;
Journal of Sensor Science and Technology , volume 25, issue 3, 2016, Pages 189~195
DOI : 10.5369/JSST.2016.25.3.189
In this paper, we newly introduce a visible light communication (VLC) repeater using the LED array in an LED lamp. The LED array is used for a light source in the repeater, which radiates light both for illumination and data transmission. A VLC repeater is made by adding some electronic circuits to the LED array including a photodetector, a demodulator, and a modulator. The repeater is installed on the ceiling of a room like a conventional LED lamp, receives the VLC signal from an arbitrary transmitter, recovers data, and radiates the signal to wide area in the room. We used a carrier frequency of 100 kHz for the uplink from a transmitter to the repeater, and 500 kHz for the downlink from the repeater to a receiver. The repeater is useful for increasing the transmission path to wide area over the obstacles that may exist between VLC transmitters and receivers.
A Remote Rehabilitation System using Kinect Stereo Camera
Kim, Kyungah ; Chung, Wan-Young ; Kim, Jong-Jin ;
Journal of Sensor Science and Technology , volume 25, issue 3, 2016, Pages 196~201
DOI : 10.5369/JSST.2016.25.3.196
Rehabilitation exercises are the treatments designed to help patients who are in the process of recovery from injury or illness to restore their body functions back to the original status. However, many patients suffering from chronic diseases have found difficulties visiting hospitals for the rehabilitation program due to lack of transportation, cost of the program, their own busy schedules, etc. Also, the program usually contains a few medical check-ups which can cause patients to feel uncomfortable. In this paper, we develop a remote rehabilitation system with bio-signals by a stereo camera. A Kinect stereo camera manufactured by Microsoft corporation was used to recognize the body movement of a patient by using its infrared(IR) camera. Also, we detect the chest area of a user from the skeleton data and process to gain respiratory status. ROI coordinates are created on a user's face to detect photoplethysmography(PPG) signals to calculate heart rate values from its color sensor. Finally, rehabilitation exercises and bio-signal detecting features are combined into a Windows application for the cost effective and high performance remote rehabilitation system.
A Two-step Kalman/Complementary Filter for Estimation of Vertical Position Using an IMU-Barometer System
Lee, Jung Keun ;
Journal of Sensor Science and Technology , volume 25, issue 3, 2016, Pages 202~207
DOI : 10.5369/JSST.2016.25.3.202
Estimation of vertical position is critical in applications of sports science and fall detection and also controls of unmanned aerial vehicles and motor boats. Due to low accuracy of GPS(global positioning system) in the vertical direction, the integration of IMU(inertial measurement unit) with the GPS is not suitable for the vertical position estimation. This paper investigates an IMU-barometer integration for estimation of vertical position (as well as vertical velocity). In particular, a new two-step Kalman/complementary filter is proposed for accurate and efficient estimation using 6-axis IMU and barometer signals. The two-step filter is composed of (i) a Kalman filter that estimates vertical acceleration via tilt orientation of the sensor using the IMU signals and (ii) a complementary filter that estimates vertical position using the barometer signal and the vertical acceleration from the first step. The estimation performance was evaluated against a reference optical motion capture system. In the experimental results, the averaged estimation error of the proposed method was 19.7 cm while that of the raw barometer signal was 43.4 cm.
Arc-Flash Detection Sensor Based on Surface Coupling of Plastic Optical Fiber
Jeong, Hoonil ; Kim, Myoung Jin ; Kim, Young Ho ; Kim, Youngwoong ; Rho, Byung Sup ;
Journal of Sensor Science and Technology , volume 25, issue 3, 2016, Pages 208~212
DOI : 10.5369/JSST.2016.25.3.208
In this work, a loop sensor for Arc-Flash detections has been developed in order to trip a circuit breaker within 2.5 ms after an Arc-Flash event. For an efficient capturing of the flash light, plastic optical fibers, where light attenuations are larger than those in silica-based ones, with different diameters and surface conditions were utilized. The performance was comparatively analyzed with those of a point sensor and a commercialized product. The point sensor module was designed for hemisphere-like capturings of Arc-Flashes larger than 3 kA at 2 meters from the sensor. On the other hand, the loop sensor allowed 360-degree-detections around the fiber axis and the measurement range was dependent on the length of the fiber connected to the sensor module. The trip-level-dependent brightness measurement results showed that the fabricated point sensor and loop sensor satisfied a brightness condition, 10~40 klux, and the responses of the system to Arc-Flashes were completed within 2.5 ms.
Fabrication of Stable Water/Oil Separation Filter Using Effect of Surface Wettability
Kim, Dohyeong ; An, Taechang ;
Journal of Sensor Science and Technology , volume 25, issue 3, 2016, Pages 213~217
DOI : 10.5369/JSST.2016.25.3.213
The superhydrophobic and superoleophobic meshes surfaces have been used in various applications such as self-cleaning, anti-icing, gas exchange, oil-water separation, sound-wave penetrable anti-wetting structures, etc. In particular, there are many studies for oil-water separation with environmental issues. Because of high pressure and dynamic environment, oil-water separation filters must have stable surface properties as super-hydrophobicity and superoleophobicity. The oleophobicity of surface depends on the surface chemistry and roughness of the surface. The roughness of oleophobic surface enhances its static contact angle and stability. The multi-scale hierarchical structure provides a stable superhydrophobic state by maintaining a Cassie state. In this research, we fabricated a superoleophobic mesh with a multi-scale hierarchical structure to increase the pressure resistance and adjusted a size of the mesh hole.
Highly Sensitive Trimethylamine Sensing Characteristics of V-doped NiO Porous Structures
Park, Sei Woong ; Yoon, Ji-Wook ; Park, Joon-Shik ; Lee, Jong-Heun ;
Journal of Sensor Science and Technology , volume 25, issue 3, 2016, Pages 218~222
DOI : 10.5369/JSST.2016.25.3.218
Pure and V-doped NiO porous structures were prepared by the evaporation-induced surfactant assembly and subsequent pyrolysis of assembled structures, and their gas sensing characteristics were investigated. Pure NiO porous structures showed negligible gas responses (S=
: sensor resistance in analytic gas;
: sensor resistance in air) to 5 ppm trimethylamine (S=1.17) as well as other interfering gases such as ethanol, p-xylene, toluene, benzene and formaldehyde (S=1.02-1.13). In contrast, the V-doped NiO porous structures exhibited a high response and selectivity to 5 ppm trimethylamine (S=14.5) with low cross-responses to other interfering gases (S=4.0-8.7) at
. The high gas response of V-doped NiO porous structures to trimethylamine was explained by electronic sensitization, that is, the increase in the chemoresistive variation due to the decrease in the hole concentration. The enhanced selectivity to trimethylamine was discussed in relation to the interaction between basic trimethylamine gas and acidic V catalysts.
Nanoparticles Loaded Electrospun WO
Nanofiber Chemical Sensor for Early Diagnosis of Halitosis
Jang, Ji-Soo ; Kim, Sang-Joon ; Choi, Seon-Jin ; Koo, Won-Tae ; Kim, Il-Doo ;
Journal of Sensor Science and Technology , volume 25, issue 3, 2016, Pages 223~228
DOI : 10.5369/JSST.2016.25.3.223
In this work, we prepared porous WO3 nanofibers (NFs) functionalized by bio-inspired catalytic
nanoparticles as highly sensitive and selective
gas sensing layers. Highly porous 3-dimensional (3D) NFs networks decorated by well-dispersed catalyst NPs exhibited superior
gas response (
= 46 at 5 ppm) in high humidity environment (95 %RH). In particular, the sensors showed outstanding
selectivity against other interfering analytes (such as acetone, toluene, CO,
, ethanol). Exhaled breath sensors using
NFs are highly promising for the accurate detection of halitosis.
Calculation of Initial Sensitivity for Vanadium Self-Powered Neutron Detector (SPND) using Monte Carlo Method
CHA, Kyoon Ho ; PARK, Young Woo ;
Journal of Sensor Science and Technology , volume 25, issue 3, 2016, Pages 229~234
DOI : 10.5369/JSST.2016.25.3.229
Self-powered neutron detector (SPND) is being widely used to monitor the reactor core of the nuclear power plants. The SPND contains a neutron-sensitive metallic emitter surrounded by a ceramic insulator. Currently, the vanadium (V) SPND has been being developed to be used in OPR1000 nuclear power plants. Some Monte Carlo simulations were accomplished to calculate the initial sensitivity of vanadium emitter material and alumina insulator with a cylindrical geometry. An MCNP code was used to simulate some factors (neutron self-shielding factor and beta escape probability from the emitter) and space charge effect of an insulator necessary to calculate the sensitivity of vanadium detector. The simulation results were compared with some theoretical and experimental values. The method presented here can be used to analyze the optimum design of the vanadium SPND and contribute to the development of TMI (Top-mount In-core Instrumentation) which might be used in the SMART and SMR.