Go to the main menu
Skip to content
Go to bottom
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 24, Issue 6 - Nov 2015
Volume 24, Issue 5 - Sep 2015
Volume 24, Issue 4 - Jul 2015
Volume 24, Issue 3 - May 2015
Volume 24, Issue 2 - Mar 2015
Volume 24, Issue 1 - Jan 2015
Selecting the target year
MEMS/Nano-technologies for Smart Air Environmental Monitoring Sensors
Park, Inkyu ; Yang, Daejong ; Kang, Kyungnam ;
Journal of Sensor Science and Technology , volume 24, issue 5, 2015, Pages 281~286
DOI : 10.5369/JSST.2015.24.5.281
The importance of air quality monitoring is rapidly increasing. Even though state-of-the-art air quality monitoring technologies such as mass spectrometry, gas chromatography, and optical measurement enable high-fidelity measurement of air pollutants, they cannot be widely used for portable or personalized platforms because of their high cost and complexity. Recently, personalized and localized environmental monitoring, rather than global and averaged environmental monitoring, has drawn greater attention with the advancement of mobile telecommunication technologies. Here, micro- and nano-technologies enable highly integrated and ultra-compact sensors to meet the needs of personalized environmental monitoring. In this paper, several examples of MEMS-based gas sensors for compact and personalized air quality monitoring are explained. Additionally, the principles and usage of functional nanomaterials are discussed for highly sensitive and selective gas sensors.
Investigation on Hermeticity of Liquid Crystal Polymer Package for MEMS Based Safety Device
Choi, Jinnil ; Kim, Yong-Kook ; Ju, Byeong-Kwon ;
Journal of Sensor Science and Technology , volume 24, issue 5, 2015, Pages 287~290
DOI : 10.5369/JSST.2015.24.5.287
Liquid crystal polymer (LCP) is a thermoplastic polymer with superior mechanical and thermal properties. In addition, its characteristics include very low water absorption rate and possibility to apply bonding process under low temperature. In this study, LCP is utilized as a packaging material for a microelectronic system (MEMS) based safety device with suggestion of a low temperature packaging process. Highly sensitive and stable capacitive type humidity sensor is fabricated to investigate hermeticity of the packaged MEMS device.
The Current Methods of Landslide Monitoring Using Observation Sensors for Geologic Property
Chae, Byung-Gon ; Song, Young-Suk ; Choi, Junghae ; Kim, Kyeong-Su ;
Journal of Sensor Science and Technology , volume 24, issue 5, 2015, Pages 291~298
DOI : 10.5369/JSST.2015.24.5.291
There are many landslides occurred by typhoons and intense rainfall during the summer seasons in Korea. To predict a landslide triggering it is important to understand mechanisms and potential areas of landslides by the geological approaches. However, recent climate changes make difficult to predict landslide based on only conventional prediction methods. Therefore, the importance of a real-time monitoring of landslide using various sensors is emphasized in recent. Many researchers have studied monitoring techniques of landslides and suggested several monitoring systems which can be applicable to the natural terrain. Most sensors of landslide monitoring measure slope displacement, hydrogeologic properties of soils and rocks, changes of stress in soil and rock fractures, and rainfall amount and intensity. The measured values of each sensor are transmitted to a monitoring server in real-time. The ultimate goal of landslide monitoring is to warn landslide occurrence in advance and to reduce damages induced by landslides. This study introduces the current situation of landslide monitoring techniques in each country.
Open-Source Hardware Module Application for Remote Monitoring of Disaster Prevention
Jin, Kyung-Chan ; Lee, Eun-Ju ; Lee, Sung-Ho ;
Journal of Sensor Science and Technology , volume 24, issue 5, 2015, Pages 299~305
DOI : 10.5369/JSST.2015.24.5.299
Since the natural disasters such as floods, droughts, heat wave and cold wave are increasing, the need for risk management is necessary to minimize the damage with utilizing IT technology. Also, the monitoring services of disaster response type have been developed and applied. Recently, the open source hardware based on the signal of the sensor, or the monitoring studies have been carried. In this paper, by analyzing a low-cost open source hardware platform such as Beagle board, we examine the utilization of the hardware-based module for sensor monitoring.
Safety Monitoring Sensor for Underground Subsidence Risk Assessment Surrounding Water Pipeline
Kwak, Pill-Jae ; Park, Sang-Hyuk ; Choi, Chang-Ho ; Lee, Hyun-Dong ;
Journal of Sensor Science and Technology , volume 24, issue 5, 2015, Pages 306~310
DOI : 10.5369/JSST.2015.24.5.306
IoT(Internet of Things) based underground risk assessment system surrounding water pipeline enables an advanced monitoring and prediction for unexpected underground hazards such as abrupt road-side subsidence and urban sinkholes due to a leak in water pipeline. For the development of successful assessment technology, the PSU(Water Pipeline Safety Unit) which detects the leakage and movement of water pipes. Then, the IoT-based underground risk assessment system surrounding water pipeline will be proposed. The system consists of early detection tools for underground events and correspondence services, by analyzing leakage and movement data collected from PSU. These methods must be continuous and reliable, and cover certain block area ranging a few kilometers, for properly applying to regional water supply changes.
Review on Sensor Technology to Detect Toxic Gases
Lee, Janghyeon ; Lim, Si-Hyung ;
Journal of Sensor Science and Technology , volume 24, issue 5, 2015, Pages 311~318
DOI : 10.5369/JSST.2015.24.5.311
The excess use and generation of various toxic gases from many industrial complexes and plant facilities have increased the possibility of leakage or explosion accidents, which can cause fatal damage to human beings in the wide range of neighboring area. To prevent the exposure to the fatal toxic gases, it is very important to monitor the leakage of toxic gases using gas sensors in real time. Various types of gas sensors, which can be classified as semiconductor, electrochemical, optical, and catalytic combustion types according to the operating principles, have been developed. In this review, the operation principles of gas sensors are explained and the performance of those sensors is compared. The state-of-the-art gas sensor technologies developed by research institutes or companies are reviewed also.
Thermal Packaging for Firefighters' Personal Protective Elctronic Equipments
Park, Woo-Tae ; Jeon, Jiwon ; Choi, Han Tak ; Woo, Hee Kwon ; Woo, Deokha ; Lee, Sangyoup ;
Journal of Sensor Science and Technology , volume 24, issue 5, 2015, Pages 319~325
DOI : 10.5369/JSST.2015.24.5.319
While the conventional personal protective equipments (PPEs) covers a variety of devices and garments such as respirators, turnout gear, gloves, blankets and gas masks, several electronic devices such as personal alert safety system (PASS) and heads-up displays in the facepiece have become a part of firefighters personal protective equipments through past several years. Furthermore, more advanced electronic sensors including location traking sensor, thermal imaging caerma, toxic gas detectors, and even physiological monitoring sensors are being integrated into ensemble elements for better protection of firefighters from fire sites. Despite any electronic equipment placed on the firefighter must withstand environmental extremes and continue to properly function under any thermal conditions that firefighters routinely face, there are no specific criteria for these electronics to define functionability of these devices under given thermal conditions. Although manufacturers provide the specifications and performance guidelines for their products, their operation guidelines hardly match the real thermal conditions. Present study overviews firefighter's fatalities and thermal conditions that firefighters and their equipments face. Lastly, thermal packaging methods that we have developed and tested are introduced.
Sensor Technology Trends of the Railroad System
SHIN, Duck-Ho ;
Journal of Sensor Science and Technology , volume 24, issue 5, 2015, Pages 326~330
DOI : 10.5369/JSST.2015.24.5.326
The recent development of Sensor technology has broadened its applications to many fields of industry including railroad. The sensor technology enables the railroad system to monitor and control. This paper suggests the sensor based system design for evaluating and improving the reliability and safety of the ICT system. For this purpose, the reliability and the level of safety integrity of a general gateway have been predicted quantitatively and the supplementary design has been proposed for RAMS improvement. RAMS requirements for each life cycle stipulated in IEC 62278. RAMS activity is capable of producing significant and effective reductions in operation costs and time.
Real-time Water Monitoring System for Small Water Supply Facility using High Reliable Wireless Sensor Network
Kang, Hoyong ; Jang, Youn-Seon ;
Journal of Sensor Science and Technology , volume 24, issue 5, 2015, Pages 331~341
DOI : 10.5369/JSST.2015.24.5.331
In this paper, real-time water quality monitoring system of small water supply facilities based on IEEE 802.15.4e-2012 DSME MAC and IEEE 802.15.4g-2012 PHY standard is presented, which is capable to acquire for highly reliable water quality information in the wide outdoor areas for effective water quality management of small water quality facilities is distributed in the long distance and remote areas. Previously, Long distance transmission is difficult in most water quality sensor module is using RS-485 protocol. But with this system, even in harsh outdoor environment, it is possible to establish a radio wave sensor in a wide area network, and not only water quality sensor shall be connected to the wireless system, but also wireless integrated management system shall provide more effective way of management of the numerous small water supply facilities spread throughout the community, so that the administrator can remotely monitor the data of water turbidity, pH, residual chlorine in the water-supply, water-level, and generate alarm to cope with risks. The management of small water facilities is done by residents will be very effective to notice water quality information of small water facilities to residents.
An Indoor Broadcasting System Using Light-Emitting Diode Lamps Coupled with Power Line
Lee, Seong-Ho ;
Journal of Sensor Science and Technology , volume 24, issue 5, 2015, Pages 342~347
DOI : 10.5369/JSST.2015.24.5.342
We introduce an indoor broadcasting system using light-emitting diode (LED) lamps coupled with a 220 V power line. Two couplers connected to the power line constitute a power line communication (PLC) link. The transmission path from an LED lamp to a photodetector forms a visible light communication (VLC) link in free space. When the LED lamp is coupled to the power line, a composite PLC-VLC link is formed, making it possible to transmit a VLC signal beyond line-of-sight. In experiments, a 4 kHz analog signal modulated with a 100 kHz carrier was sent to the power line by a PLC coupler, and LED lamps coupled to the power line detected the signal and radiated it to multiple VLC receivers in the room. This configuration is useful in expanding an indoor VLC sensor network to adjacent rooms or constructing a voice broadcasting system in a building or apartments with existing power lines.
Resistivity Variation of Nickel Oxide by Substrate Heating in RF Sputter for Microbolometer
Lee, Yong Soo ;
Journal of Sensor Science and Technology , volume 24, issue 5, 2015, Pages 348~352
DOI : 10.5369/JSST.2015.24.5.348
Thin nickel oxide films formed on uncooled and cooled
substrates using a radio frequency (RF) magnetron sputter powered by 200 W in a mixed atmosphere of argon and oxygen. Grazing-incidence X-ray diffraction and field emission scanning electron microscopy are used for the structural analysis of nickel oxide films. The electrical conductivity required for better bolometric performance is estimated by means of a four-point probe system. Columnar and (200) preferred orientations are discovered in both films regardless of substrate cooling. Electric resistivity, however, is greatly influenced by the substrate cooling. Oxygen partial pressure increase during the nickel oxide deposition leads to a rapid decrease in resistivity, and the resistivity is higher in the cooled nickel oxide samples. Even when small microstructure variations are applied, lower resistivity in favor of low noise performance is acquired in the uncooled samples.
A SPICE-Compatible Model for a Gate/Body-Tied PMOSFET Photodetector With an Overlapping Control Gate
Jo, Sung-Hyun ; Bae, Myunghan ; Choi, Byoung-Soo ; Choi, Pyung ; Shin, Jang-Kyoo ;
Journal of Sensor Science and Technology , volume 24, issue 5, 2015, Pages 353~357
DOI : 10.5369/JSST.2015.24.5.353
A new SPICE-compatible model for a gate/body-tied PMOSFET photodetector (GBT PD) with an overlapping control gate is presented. The proposed SPICE-compatible model of a GBT PD with an overlapping control gate makes it possible to control the photocurrent. Research into GBT PD modeling was proposed previously. However, the analysis and simulation of GBT PDs is not lacking. This SPICE model concurs with the measurement results, and it is simpler than previous models. The general GBT PD model is a hybrid device composed of a MOSFET, a lateral bipolar junction transistor (BJT), and a vertical BJT. Conventional SPICE models are based on complete depletion approximation, which is more applicable to reverse-biased p-n junctions; therefore, they are not appropriate for simulating circuits that are implemented with a GBT PD with an overlapping control gate. The GBT PD with an overlapping control gate can control the sensitivity of the photodetector. The proposed sensor is fabricated using a
two-poly, four-metal standard complementary MOS (CMOS) process, and its characteristics are evaluated.