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Noncontact Proximity Vital Sign Sensor Based on PLL for Sensitivity Enhancement
Hong, Yunseog,Kim, Sang-Gyu,Kim, Byung-Hyun,Ha, Sung-Jae,Lee, Hee-Jo,Yun, Gi-Ho,Yook, Jong-Gwan IEEE 2014 IEEE transactions on biomedical circuits and syste Vol.8 No.4
<P>In this paper, a noncontact proximity vital sign sensor, using a phase locked loop (PLL) incorporated with voltage controlled oscillator (VCO) built-in planar type circular resonator, is proposed to enhance sensitivity in severe environments. The planar type circular resonator acts as a series feedback element of the VCO as well as a near-field receiving antenna. The frequency deviation of the VCO related to the body proximity effect ranges from 0.07 MHz/mm to 1.8 MHz/mm (6.8 mV/mm to 205 mV/mm in sensitivity) up to a distance of 50 mm, while the amount of VCO drift is about 21 MHz in the condition of 60<TEX>$^{\circ}{\rm C}$</TEX> temperature range and discrete component tolerance of <TEX>$\pm$</TEX>5%. Total frequency variation occurs in the capture range of the PLL which is 60 MHz. Thus, its loop control voltage converts the amount of frequency deviation into a difference of direct current (DC) voltage, which is utilized to extract vital signs regardless of the ambient temperature. The experimental results reveal that the proposed sensor placed 50 mm away from a subject can reliably detect respiration and heartbeat signals without the ambiguity of harmonic signals caused by respiration signal at an operating frequency of 2.4 GHz.</P>
A Label-Free Biosensing Platform Using a PLL Circuit and Biotin-Streptavidin Binding System
Yunseog Hong,Hee-Jo Lee,Sang-Gyu Kim,Byung-Hyun Kim,Gi-Ho Yun,Jong-Gwan Yook IEEE 2015 IEEE transactions on biomedical circuits and syste Vol.9 No.3
<P>This paper proposes a novel RF biosensor that utilizes a frequency synthesizer associated with a microstrip open-loop resonator for label-free biomolecular detection. The RF biosensor consists mainly of a resonance-assisted transducer and a phase locked loop (PLL) circuit. In this work, the performance of the RF biosensor is validated using the well-known biotin-streptavidin binding system. When biotin is bound to streptavidin, the input impedance of the resonator is varied, resulting in a change in the oscillation frequency. The concentration of the streptavidin is ultimately detected by a voltage signal of the PLL's loop filter with simple measurement equipment. According to the experimental results, the RF biosensor has revealed excellent sensitivity ( ~ 61 kHz/ngml<SUP>-1</SUP>) and a low detection limit ( ~ 1 ng/ml), as well as a rapid response. These results demonstrate that the RF biosensor can be an effective sensing platform for label-free detection in a biomolecular binding system.</P>
A Proximity Coupling RF Sensor for Wrist Pulse Detection Based on Injection-Locked PLL
Byung-Hyun Kim,Yunseog Hong,Yong-Jun An,Sang-Gyu Kim,Hee-Jo Lee,Sung-Woo Kim,Seung-Bum Hong,Gi-Ho Yun,Jong-Gwan Yook Professional Technical Group on Microwace Theory a 2016 IEEE Transactions on Microwave Theory and Techniqu Vol. No.
<P>In this paper, a proximity coupling RF sensor based on injection-locked phase-locked loop (PLL) for wrist pulse detection is proposed. The sensor is composed of two main parts: a free-running oscillator and a PLL synthesizer containing a voltage-controlled oscillator. The free-running oscillator is built with a two-port microstrip line resonator (interdigital electrodes), which acts as part of a transducer that can transform the expansion or contraction of the radial artery into an impedance variation. Measurements show that the impedance variation of the resonator due to changes in the radial artery causes a frequency change of up to 0.74 MHz in the free-running oscillator. For the PLL part, the frequency change can be transformed to a variation in dc voltage by injection of the modulated signal from the wrist pulse into a phase-locked oscillator. The variation of the loop-control voltage, in one cycle of the pulse, is approximately 10-15 mV peak-to-peak. Our sensor is demonstrated to be an effective noncontact and noninvasive scheme for wrist pulse detection.</P>
조절형 및 지능형 최고속도제한장치 평가방법 개발에 관한 연구
조상수(SangSoo Cho),홍재용(JaeYong Hong),홍윤석(YunSeog Hong) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5
Recently, a traffic accident caused by overspeed in a highway occupied the highest proportion, and it is known that mortality rate due to overspeed is the highest a traffic accident in Korea. So that, Korea government(ministry of Land, Infrastructure and Transport) is planning to include a speed limitation Device’s performance evaluation item in the new car assessment program(NCAP) from the year 2017 in order to prevent accidents by encouraging to install the device. Thesedays, a type of the speed limitation device is diversified because the Advanced Driver Assistance System(ADAS) that prevent a traffic accident caused by the driver’s careless is more interested. However, there is no any test protocol that evaluate the performance and key features for each type of the diversified device in Korea. Therefore, in order to develop the test protocol for each type for the diversified speed limitation device, the draft test protocol and criteria is developed by analyzing the technology trends of the device and comparing the domestic or foreign standard in the paper. And then, a suitability of the draft protocol is determined by testing the real vehicle with of the draft test protocol and criteria and investigating Korea’s traffic regulatory framework for example speed limit etc Finally, the performance evaluation test method and evaluation criteria for the adjustable speed limitation device and intelligent speed assistance to be forced in 2017 was established.
발진기의 2채배 고조파 주파수 천이를 이용한 생체신호 측정센서
구기영(Ki-Young Ku),홍윤석(Yunseog Hong),이희조(Hee-Jo Lee),윤기호(Gi-Ho Yun),육종관(Jong-Gwan Yook),김강욱(Kang-Wook Kim) 한국전자파학회 2016 한국전자파학회논문지 Vol.27 No.3
본 논문에서는 공진기와 인체와의 거리에 따른 근접 전자기장 변화에 의한 공진기 임피던스의 변화를 토대로 사람의 호흡 및 심박신호를 검출할 수 있는 센서를 제안한다. 제안된 생체신호 측정센서는 패치형 공진기가 결합된 발진기, 발진주파수의 2채배 주파수만 통과시키기 위한 다이플렉서, 증폭기, SAW 필터 및 RF 검출기로 구성되어 있다. 호흡과 심박신호와 같은 인체의 주기적인 움직임은 근접 전자기장 영역 안에서 공진기의 임피던스 변화를 야기하며, 발진기의 주파수를 변화시킨다. 감도를 향상시키기 위해 발진주파수의 2채배 주파수 천이를 SAW 필터의 저지대역에 위치시킴으로써, 제안된 센서의 검출 거리를 2배로 확장시킬 수 있다. 제안된 센서의 측정결과, 최대 40 ㎜까지 호흡 및 심박신호가 안정적으로 측정되는 것을 확인하였다. In this paper, a vital sign sensor based on impedance variation of resonator is proposed to detect the respiration and heartbeat signals within near-field range as a function of the separation distance between resonator and subject. The sensor consists of an oscillator with a built-in planar type patch resonator, a diplexer for only pass the second harmonic frequency, amplifier, SAW filter, and RF detector. The cardiac activity of a subject such as respiration and heartbeat causes the variation of the oscillation frequency corresponding impedance variation of the resonator within near-field range. The combination of the second harmonic oscillation frequency deviation and the superior skirt frequency of the SAW filter enables the proposed sensor to extend twice detection range. The experimental results reveal that the proposed sensor placed 40 ㎜ away from a subject can reliably detect respiration and heartbeat signals.