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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 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
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Linear-logarithmic Active Pixel Sensor with Photogate for Wide Dynamic Range CMOS Image Sensor
Bae, Myunghan ; Jo, Sung-Hyun ; Choi, Byoung-Soo ; Choi, Pyung ; Shin, Jang-Kyoo ;
Journal of Sensor Science and Technology , volume 24, issue 2, 2015, Pages 79~82
DOI : 10.5369/JSST.2015.24.2.79
This paper proposes a novel complementary metal oxide semiconductor (CMOS) active pixel sensor (APS) and presents its performance characteristics. The proposed APS exhibits a linear-logarithmic response, which is simulated using a standard
CMOS process. To maintain high sensitivity and improve the dynamic range (DR) of the proposed APS at low and high-intensity light, respectively, two additional nMOSFETs are integrated into the structure of the proposed APS, along with a photogate. The applied photogate voltage reduces the sensitivity of the proposed APS in the linear response regime. Thus, the conversion gain of the proposed APS changes from high to low owing to the addition of the capacitance of the photogate to that of the sensing node. Under high-intensity light, the integrated MOSFETs serve as voltage-light dependent active loads and are responsible for logarithmic compression. The DR of the proposed APS can be improved on the basis of the logarithmic response. Furthermore, the reference voltages enable the tuning of the sensitivity of the photodetector, as well as the DR of the APS.
Development of Single-layer-structured Glucose Biosensor
Lee, Young-Tae ; Kwon, Min Su ;
Journal of Sensor Science and Technology , volume 24, issue 2, 2015, Pages 83~87
DOI : 10.5369/JSST.2015.24.2.83
In this paper, we fabricated a low-cost glucose sensor with a simpler structure and fabrication process than the existing glucose sensor. The currently used glucose sensor has a three-layer structure with upper, middle, and bottom plates; here, we fabricated a single-layer glucose sensor using only a printing and dispensing process. We successfully fabricated the glucose sensor using a simple method involving the formation of an electrode and insulator layer through a 2- or 3-step printing process on plastic or paper film, followed by the dispensing of glucose oxidase solution on the electrode. Cyclic voltammetry (CV) and cyclic amperometry (CA) measurements were used to evaluate the characteristics of the fabricated single-layer glucose sensor. Also, its sensitivity was analyzed through glucose-controlled blood measurements. Hence, a low-cost single-layer glucose sensor was fabricated with evaluation of its characteristics demonstrating that it has useful application in medicine.
Preparation of a Semi-Conductive Thin Film Sensor for Measuring Occlusal Force
Yu, Siwon ; Kim, Nari ; Lee, Youngjin ;
Journal of Sensor Science and Technology , volume 24, issue 2, 2015, Pages 88~92
DOI : 10.5369/JSST.2015.24.2.88
In order to study the semi-conductive characteristics of carbon black-filled ethylene-propylene-diene monomer (EPDM) composite film, which is used for measuring occlusal force, composite samples with volume ratios of carbon black to EPDM ranging from 30% to 70% were prepared. The process of making a composite film consists of two steps, which involve the preparation of a slurry composition and the fabrication of a thin film using solution casting and a lamination process. To prepare the slurry composition, we dispersed carbon black nanoparticles into an organic solvent before mixing with an EPDM solution in toluene. The mechanical and electrical properties of the resulting carbon black-filled EPDM film were then investigated, and the results showed that the electrical resistance of a film decreases with the increase in the carbon black content. Furthermore, improved elastic recovery was observed after cross-linking the EPDM.
Robust Optical Detection Method for the Vibrational Mode of a Tuning Fork Crystal Oscillator
Choi, Hyo-Seung ; Song, Sang-Hun ;
Journal of Sensor Science and Technology , volume 24, issue 2, 2015, Pages 93~95
DOI : 10.5369/JSST.2015.24.2.93
We present an optical detection method for the fundamental vibrational mode of a tuning fork crystal oscillator in air. A focused He/Ne laser beam is directed onto the edge of one vibrating tine of the tuning fork; its vibrating motion chops the incoming laser beam and modulates the intensity. The beam with modulated intensity is then detected and converted to an electrical signal by a high-speed photo-detector. This electrical signal is a sinusoid at the resonant frequency of the tuning fork vibration, which is 32.76 kHz. Our scheme is robust enough that the sinusoidal signal is detectable at up to
of rotation of the tuning fork.
Development of a Real-time Radiation Level Monitoring Sensor for Building an Underwater Radiation Monitoring System
Park, Hye Min ; Joo, Koan Sik ;
Journal of Sensor Science and Technology , volume 24, issue 2, 2015, Pages 96~100
DOI : 10.5369/JSST.2015.24.2.96
In the present study, we developed a real-time radiation-monitoring sensor for an underwater radiation-monitoring system and evaluated its effectiveness using reference radiation sources. The monitoring sensor was designed and miniaturized using a silicon photomultiplier (SiPM) and a cerium-doped-gadolinium-aluminum-gallium-garnet (Ce:GAGG) scintillator, and an underwater wireless monitoring system was implemented by employing a remote Bluetooth communication module. An acrylic water tank and reference radiation sources (
) were used to evaluate the effectiveness of the monitoring sensor. The underwater monitoring sensor's detection response and efficiency for gamma rays and beta particles as well as the linearity of the response according to the gammaray intensity were verified through an evaluation. This evaluation is expected to contribute to the development of base technology for an underwater radiation-monitoring system.
Development and Characterization of Multi-Segmented Tissue Equivalent Proportional Counter for Microdosimetry
Nam, Uk-Won ; Park, Won-Kee ; Lee, Jaejin ; Pyo, Jeonghyun ; Moon, Bong-Kon ; Moon, Myung Kook ; Lim, Chang Hwy ; Lee, Suhyun ; Kim, Sunghwan ;
Journal of Sensor Science and Technology , volume 24, issue 2, 2015, Pages 101~106
DOI : 10.5369/JSST.2015.24.2.101
We designed, developed and characterized a multi-segmented tissue equivalent proportional (TEPC) counter for microdosimetry. The energy resolution of the multi-segmented TEPC was about 12% for
5.45 MeV alpha particles. The resolution was better than 33% for a single un-segmented TEPC. A compact and low power consumption TEPC could be made by using digital pulse processor (DPP). We also successfully calibrated the TEPC by using
standard neutron source in Korea Research Institute of Standards and Science (KRISS). According to the results, the TEPC is useful for several application of radiation monitoring such as a neutron monitor, air crew monitor and space dosimeter.
Design of a Key Scheduler for Supporting the Parallel Encryption and Decryption Processes of HIGHT
Choi, Won-Jung ; Lee, Je-Hoon ;
Journal of Sensor Science and Technology , volume 24, issue 2, 2015, Pages 107~112
DOI : 10.5369/JSST.2015.24.2.107
HIGHT is an 64-bit block cipher, which is suitable for low power and ultra-light implementation that are used in the network that needs the consideration of security aspects. This paper presents a parallel key scheduler that generates the whitening keys and subkeys simultaneously for both encryption and decryption processes. We construct the reverse LFSR and key generation blocks to generate the keys for decryption process. Then, the new key scheduler is made by sharing the common logics for encryption and decryption processes to minimize the increase in hardware complexity. From the simulation results, the logic size is increased 1.31 times compared to the conventional HIGHT. However, the performance of HIGHT including the proposed key scheduler can be increased by two times compared to the conventional counterpart.
Optical Sensor of Coplanar Structure Study and Design for Intravenous Solution Exhaustion Alarm System
Park, Hyo Soon ; Kim, Tae Yun ; Jung, Eui Sung ; Seong, Ki Woong ; Kim, Myoung Nam ; Cho, Jin-Ho ;
Journal of Sensor Science and Technology , volume 24, issue 2, 2015, Pages 113~118
DOI : 10.5369/JSST.2015.24.2.113
Intravenous (IV) infusion set is one of the most common treatment methods applied to hospitalized patients. However, it is necessary to check the injection of IV solution in order to prevent patients from any possible medical injuries. In this paper, using the optical sensors to detect exhaustion of IV solution was proposed. The optical sensor is coplanar structure composed of LED and photodiode which is installed according to focal distance of the lens. These two elements detect exhaustion of IV solution at the desired point conveniently. Through the results of experiments using various wavelength of LED (R.G.B), the blue LED was selected to the optimum light source. The suggested optical sensor can detect exhaustion of IV solution by the differences in the amount of light which is caused by properties such as total reflection, refractive index and scattering. From the implementation, the detector is applicable to both containers of IV solution, glass bottle and plastic pack. And also the result shows apparent differences according to existence of IV solution even if the IV solution color and illumination were changed.
Fabrication of Flexible Temperature & Humidity Sensor Using Inkjet-printing Technology
Kye, Ji Won ; Han, Dong Cheul ; Shin, Han Jae ; Kim, HeonGon ; Lee, Wanghoon ;
Journal of Sensor Science and Technology , volume 24, issue 2, 2015, Pages 119~123
DOI : 10.5369/JSST.2015.24.2.119
This paper presents the inkjet-printed flexible temperature and humidity sensor(F-TH sensor) using PEDOT:PSS. The series, mesh and parallel type sensing element using PEDOT:PSS ink was printed on the overhead projector(OHP) film. The fabricated sensor of each structure has the temperature sensitivity of
with linearity, respectively. Also the fabricated sensor was not only possible to measure a temperature, but also to detect humidity. The humidity sensitivity of
with linearity, respectively. The fabricated F-TH sensor is expected for the various applications such as electronic devices, bio-healthcare, industrial field.
High Performance HIGHT Design with Extended 128-bit Data Block Length for WSN
Kim, Seong-Youl ; Lee, Je-Hoon ;
Journal of Sensor Science and Technology , volume 24, issue 2, 2015, Pages 124~130
DOI : 10.5369/JSST.2015.24.2.124
This paper presents a high performance HIGHT processor that can be applicable for CCM mode. In fact, HIGHT algorithm is a 64-bit block cipher. However, the proposed HIGHT extends the basic block length to 128-bit. The proposed HIGHT is operated as 128-bit block cipher and it can treat 128-bit block at once. Thus, it can be applicable for the various WSN applications that need fast and ultralight 128-bit block cipher, in particular, to be operated in CCM mode. In addition, the proposed HIGHT processor shares the common logics such as 128-bit key scheduler and control logics during encryption and decryption to reduce the area overhead caused by the extension of data block length. From the simulation results, the circuit area and power consumption of the proposed HIGHT are increases as 40% and 64% compared to the conventional 64-bit counterpart. However, the throughput of the proposed HIGHT can be up to two times as fast. Consequently, the proposed HIGHT is useful for USN and handheld devices based on battery as well as RFID tag the size of circuit is less than 5,000 gates.
Dynamic Range Extension of CMOS Image Sensor with Column Capacitor and Feedback Structure
Lee, Sanggwon ; Jo, Sung-Hyun ; Bae, Myunghan ; Choi, Byoung-Soo ; Kim, Heedong ; Shin, Eunsu ; Shin, Jang-Kyoo ;
Journal of Sensor Science and Technology , volume 24, issue 2, 2015, Pages 131~136
DOI : 10.5369/JSST.2015.24.2.131
This paper presents a wide dynamic range complementary metal oxide semiconductor (CMOS) image sensor with column capacitor and feedback structure. The designed circuit has been fabricated by using
1-poly 6-metal standard CMOS technology. This sensor has dual mode operation using combination of active pixel sensor (APS) and passive pixel sensor (PPS) structure. The proposed pixel operates in the APS mode for high-sensitivity in normal light intensity, while it operates in the PPS mode for low-sensitivity in high light intensity. The proposed PPS structure is consisted of a conventional PPS with column capacitor and feedback structure. The capacitance of column capacitor is changed by controlling the reference voltage using feedback structure. By using the proposed structure, it is possible to store more electric charge, which results in a wider dynamic range. The simulation and measurement results demonstrate wide dynamic range feature of the proposed PPS.
Design of a Two-Axis Force Sensor for Measuring Arm Force of an Upper-Limb Rehabilitation Robot
Kim, Gab-Soon ;
Journal of Sensor Science and Technology , volume 24, issue 2, 2015, Pages 137~143
DOI : 10.5369/JSST.2015.24.2.137
This paper describes the design of a two-axis force sensor with two step plate beams for measuring forces in an upper-limb rehabilitation robot. The two-axis force sensor is composed of a Fz force sensor and a Ty torque sensor. The Fz force sensor measures the force applied to a patient's arm pushed by a rehabilitation robot and the force of patient's arm. The Ty torque sensor measures the torque generated by a patient's arm motion in an emergency. The structure of sensor is composed of a force transmitting block, two step plate beams and two fixture blocks. The two-axis force sensor was designed using FEM (Finite Element Method), and manufactured using strain-gages. The characteristics test of the two-axis force sensor was carried out. as a test results, the interference error of the two-axis force sensor was less than 1.24%, the repeatability error of each sensor was less than 0.03%, and the non-linearity was less than 0.02%.