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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Sensor Science and Technology
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Journal DOI :
The Korean Sensors Society
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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
Material Design for Metal Oxide Chemiresistive Gas Sensors
Korotcenkov, G. ; Han, S.H. ; Cho, B.K. ;
Journal of Sensor Science and Technology , volume 22, issue 1, 2013, Pages 1~17
DOI : 10.5369/JSST.2013.22.1.1
Metal oxides designed for application in conductometric gas sensors and approaches used for synthesis of metal oxides with improved gas sensing characteristics are discussed in present article.
Priority Based Multi-Channel MAC Protocol for Real-Time Monitoring of Weapon Flight Test Using WSNs
Min, Joonki ; Kim, Joo-Kyoung ; Kwon, Youngmi ; Lee, Yong-Jae ;
Journal of Sensor Science and Technology , volume 22, issue 1, 2013, Pages 18~27
DOI : 10.5369/JSST.2013.22.1.18
Real-time monitoring is one of the prime necessities in a weapon flight test that is required for the efficient and timely collection of large amounts of high-rate sampled data acquired by an event-trigger. The wireless sensor network is a good candidate to resolve this requirement, especially considering the inhospitable environment of a weapon flight test. In this paper, we propose a priority based multi-channel MAC protocol with CSMA/CA over a single radio for a real-time monitoring of a weapon flight test. Multi-channel transmissions of nodes can improve the network performance in wireless sensor networks. Our proposed MAC protocol has two operation modes: Normal mode and Priority Mode. In the normal mode, the node exploits the normal CSMA/CA mechanism. In the priority mode, the node has one of three grades - Class A, B, and C. The node uses a different CSMA/CA mechanism according to its grade that is determined by a signal level. High grade nodes can exploit more channels and lower backoff exponents than low ones, which allow high grade nodes to obtain more transmission opportunities. In addition, it can guarantee successful transmission of important data generated by high grade nodes. Simulation results show that the proposed MAC exhibits excellent performance in an event-triggered real-time application.
Fault Tolerant Control of Wind Turbine with Sensor and Actuator Faults
Kim, Jiyeon ; Yang, Inseok ; Lee, Dongik ;
Journal of Sensor Science and Technology , volume 22, issue 1, 2013, Pages 28~37
DOI : 10.5369/JSST.2013.22.1.28
This paper presents a fault-tolerant control technique for wind turbine systems with sensor and actuator faults. The control objective is to maximize power production and minimize turbine loads by calculating a desired pitch angle within their limits. Any fault with a sensor and actuator can cause significant error in the pitch position of the corresponding blade. This problem may result in insufficient torque such that the power reference cannot be achieved. In this paper, a fault-tolerant control technique using a robust dynamic inversion observer and control allocation is employed to achieve successful pitch control despite these faults in the sensor and actuator. The observer based detection method is used to detect and isolate sensor faults by checking whether errors are larger than threshold values. In addition, the control allocation technique is adopted to tolerate actuator fault. Control allocation is one of the most commonly used fault-tolerant control techniques, especially for over-actuated systems. Further, the control allocation method can be used to achieve the power reference even in the event of blade actuator fault by redistributing the lost torque due to erroneous pitch position into non-faulty blade actuators. The effectiveness of the proposed method is demonstrated through simulations with a benchmark model of the wind turbine.
Simulation of the Blood Pressure Estimation Using the Artery Compliance Model and Pulsation Waveform Model
Jeon, Ahyoung ; Ro, Junghoon ; Kim, Jaehyung ; Baik, Seongwan ; Jeon, Gyerok ;
Journal of Sensor Science and Technology , volume 22, issue 1, 2013, Pages 38~43
DOI : 10.5369/JSST.2013.22.1.38
In this study, the artery's compliance model and the pulsation waveform model was proposed to estimate blood pressure without applying HPF (High Pass Filter) on signal measured by the oscillometric method. The method proposed in the study considered two ways of estimating blood pressure. The first method of estimating blood pressure is by comparing and analyzing changes in pulsation waveform's dicrotic notch region during each cardiac period. The second method is by comparing and analyzing morphological changes in the pulsation waveform during each cardiac period, which occur in response to the change in pressure applied on the cuff. To implement these methods, we proposed the compliance model and the pulsation waveform model of the artery based on hemodynamic theory, and then conducted various simulations. The artery model presented in this study only took artery's compliance into account. Then, a pulsation waveform model was suggested, which uses characteristic changes in the pulsation waveform to estimate blood pressure. In addition, characteristic changes were observed in arterial volume by applying artery's pulsation waveform to the compliance model. The pulsation waveform model was suggested to estimate blood pressure using characteristic changes of the pulsation waveform in the arteries. This model was composed of the sum of sine waves and a Fourier's series in combination form up to 10th harmonics components of the sinusoidal waveform. Then characteristic of arterial volume change was observed by inputting pulsation waveform into the compliance model. The characteristic changes were also observed in the pulsation waveform by mapping the arterial volume change in accordance with applied cuff's pressure change to the pulsation waveform's change according to applied pressure changes by cuff. The systolic and diastolic blood pressures were estimated by applying positional change of pulsation waveform's dicrotic notch region.
SPICE-Compatible Modeling of a Microbolometer Package Including Thermoelectric Cooler
Han, Chang Suk ; Park, Seung Man ; Kim, Nam-Hwan ; Han, Seungoh ;
Journal of Sensor Science and Technology , volume 22, issue 1, 2013, Pages 44~48
DOI : 10.5369/JSST.2013.22.1.44
For a successful commercialization of microbolometer, it is required to develop a robust package including thermal stabilizing mechanism. In order to regulate the temperature within some operating range, thermoelectric cooler is generally used but it's not easy to model the whole package due to the coupled physics nature of thermoelectric cooler. In this paper, SPICE-compatible modeling methodology of a microbolometer package is presented, whose steady-state results matched well with FEM results at the maximum difference of 5.95%. Although the time constant difference was considerable as 15.7%, it can be offset by the quite short simulation time compared to FEM simulation. The developed model was also proven to be useful for designing the thermal stabilizer through parametric and transient analyses under the various working conditions.
Laser Based Temperature Measurement of Rotating Disk Using Thermocolor
Na, Wonhwi ; Yoo, JaeChern ;
Journal of Sensor Science and Technology , volume 22, issue 1, 2013, Pages 49~53
DOI : 10.5369/JSST.2013.22.1.49
In this paper, we proposed a laser-based non-contact temperature measuring method for high speed rotating polycarbonate (PC) disk using transparency change of thermocolor. The thermocolor has abilities to change color and transparency due to a change in temperature. The thermocolor is applied on one side of polyvinylidene fluoride (PVDF) membrane. The thermocolor applied membrane is attached to inside of reaction chamber in disk. An optical system consisted of a laser beam radiator and a laser photometer is installed. Laser is irradiated at the bottom side of disk and the transmitted laser beam is detected by the laser photometer at the opposite side of disk. During the disk is rotating, laser is irradiated and detected simultaneously. The laser photometer senses the transmitted laser power and generates voltage as output. The temperature of disk can be detected during the disk is rotating up to 3000 RPM.
Implementation of a Falls Recognition System Using Acceleration and Angular Velocity Signals
Park, Geun-Chul ; Jeon, A-Young ; Lee, Sang-Hoon ; Son, Jung-Man ; Kim, Myoung-Chul ; Jeon, Gye-Rok ;
Journal of Sensor Science and Technology , volume 22, issue 1, 2013, Pages 54~64
DOI : 10.5369/JSST.2013.22.1.54
In this study, we developed a falling recognition system to transmit SMS data through CDMA communication using a three axises acceleration sensor and a two axises gyro sensor. 5 healthy men were selected into a control group, and the fall recognition system using the three axises acceleration sensor and the two axises gyro sensor was devised to conduct an experiment. The system was attached to the upper of their sternum. According to the experiment protocol, the experiment was carried out 3 times repeatedly divided into 3 specific protocols: falling during gait, falling in stopped state, and falling in everyday life. Data obtained in the falling recognition system and LabVIEW 8.5 were used to decide if falling corresponds to that regulated in an analysis program applying an algorithm proposed in this study. In addition, results from falling recognition were transmitted to designated cellular phone in a SMS (Shot Message Service) form. These research results show that an erroneous detection rate of falling reached 19% in applying an acceleration signal only; 6% in applying an angular velocity; and 2% in applying a proposed algorithm. Such finding suggests that an erroneous detection rate of falling is improved when the proposed algorithm is applied incorporated with acceleration and angular velocity. In this study therefore, we proposed that a falling recognition system implemented in this study can make a contribution to the recognition of falling of the aged or the disabled.
Development of Control Simulator for Integrated Sensor Module of Vehicle
Jeon, Jin-Young ; Park, Jeong-Yeon ; Byun, Hyung-Gi ;
Journal of Sensor Science and Technology , volume 22, issue 1, 2013, Pages 65~70
DOI : 10.5369/JSST.2013.22.1.65
The integrated sensor module of vehicle combines the functions of rain sensor, auto defog sensor, and sun angle sensor into a single module. These functions originally were applied to work separatively. This integrated sensor module should meet the each performance which appears from the individual modules up to the same level or higher. Therefore, it is important to verify the stability and the accuracy considering the characteristics of the integrated sensor module according to various situations. For the verification, we need to use the actual data of integrated sensor module measured but, a lot of time and money is needed to collect data measured under various circumstances when operating. Thus, through the development of this simulator for the control of the integrated sensor module, we can use it effectively for the initial verification of integrated sensor module by implementing the various situations. In this paper, the simulator for controlling the integrated sensor module which combines vision-based rain sensor, auto defog sensor, auto light sensor, and sun angle sensor has been developed.
Structural Health Monitoring of Nuclear Containment Building Using Fiber Bragg Grating Sensor
Lee, Seung-Hwan ; Lee, Nam-Kwon ; Lee, Geum-Seok ; Lee, Hong-Pyo ; Yu, Yun-Sik ;
Journal of Sensor Science and Technology , volume 22, issue 1, 2013, Pages 71~75
DOI : 10.5369/JSST.2013.22.1.71
Nuclear containment building is used as second blockage to protect us from a radiation leakage caused by the natural disaster or any accidents, so it's safety is important and must be kept with continuous surveillance. In this study, we measured the strain of a nuclear containment building's wall by using FBG sensor and investigated the structural safety of a nuclear containment building. 50 FBG strain sensors and 18 FBG strain sensors were attached on the side wall and upper dome of a nuclear containment building, respectively. We measured the strains of the outside concrete wall during the Structural Integrity Test (SIT) of a nuclear containment building. The strain of an upper dome was larger than that of a side wall, about
. And the very small strain was measured at vertical direction of a side wall. These experimental results were used to evaluate the structural health of nuclear containment building.
Non-Intrusive Healthcare System for Estimation of Vascular Condition in IP-Enabled Wireless Network
Jung, Sang-Joong ; Kwon, Tae-Ha ; Chung, Wan-Young ;
Journal of Sensor Science and Technology , volume 22, issue 1, 2013, Pages 76~83
DOI : 10.5369/JSST.2013.22.1.76
A real-time wireless monitoring and analysis methods using the wearable PPG sensor to estimate cardiovascular condition is studied for ubiquitous healthcare service. A small size and low-power consuming wearable photoplethysmogram (PPG) sensor is designed as a wrist type device and connected with the IP node assigned its own IPv6 address. The measured PPG waveform in the IP node is collected and transferred to a central server PC through the IP-enabled wireless network for storage and analysis purposes. A monitoring and analysis program is designed to process the accelerated plethysmogram (APG) waveform by applying the second order derivatives to analyze systolic waves as well as heart rate variability analysis from the measured PPG waveform. From our results, the features of cardiovascular condition from individual's PPG waveform and estimation of vascular compliance by the comparison of APG-aging index (AI) and ratio of LF/HF are demonstrated.
Low Cost Signal Generator with Frequency High-Resolution for SS-OCT
Lee, Juchan ; Eom, Jinseob ;
Journal of Sensor Science and Technology , volume 22, issue 1, 2013, Pages 84~88
DOI : 10.5369/JSST.2013.22.1.84
In this paper, the low price signal generator with capability of frequency high-resolution and variable sync pulse has implemented. It fulfils well the requirements for SS-OCT of the frequency resolution less than 1Hz, frequency stability of
/10 min and variable sync pulse output timing. Through its performance test applied to wavelength swept laser, 120 nm sweeping range and 10 mW average optical power were obtained. This shows that the realized sine-wave generator can replace the commercial high cost and high performance signal generators employed by current SS-OCT systems.
Fabrication of Probe Beam by Using Joule Heating and Fusing
Hong, Pyo-Hwan ; Kong, Dae-Young ; Lee, Dong-In ; Kim, Bonghwan ; Cho, Chan-Seob ; Lee, Jong-Hyun ;
Journal of Sensor Science and Technology , volume 22, issue 1, 2013, Pages 89~94
DOI : 10.5369/JSST.2013.22.1.89
In this paper, we developed a beam of MEMS probe card using a BeCu sheet. Silicon wafer thickness of
was fabricated by using deep reactive ion etching (RIE) process. After forming through silicon via (TSV), the silicon wafer was bonded with BeCu sheet by soldering process. We made BeCu beam stress-free owing to removing internal stress by using joule heating. BeCu beam was fused by using joule heating caused by high current. The fabricated BeCu beam measured length of 1.75 mm and width of 0.44 mm, and thickness of
. We measured fusing current as a function of the cutting planes. Maximum current was 5.98 A at cutting plane of
. The proposed low-cost and simple fabrication process is applicable for producing MEMS probe beam.