• 제목/요약/키워드: Bio-sensors

검색결과 328건 처리시간 0.021초

광섬유 센서를 이용한 선체 구조의 Global 하중 추정에 관한 연구 (A Study for the Measurement of Global Loads on Ship Structure Using Fiber Optic Sensors)

  • 김명현;김영제;강성원;오민철
    • 대한조선학회논문집
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    • 제45권2호
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    • pp.144-150
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    • 2008
  • Ships and offshore structures are exposed to wave and engine excitation loadings during navigation and cargo/ballasting operations. These excessive loads may cause damages to hull and may result loss of life the ship. Therefore, it is important to develop a system that allow accurate measurements of global hull loads. The objective of the study is developing a fiber optic monitoring system that is capable of monitoring, recording and warning of the vessel performance. A method for measurement of global loads on a vessel, using strain measurements from a network of fiber optic strain sensors and extensive finite-element analyses(FEA) with idealistic load cases, is presented. The method has been successfully validated on the idealized ship structure model with strain sensors.

신축성 전자소자를 위한 신축성 전극 및 스트레인 센서 개발 동향 (Technology of Stretchable Interconnector and Strain Sensors for Stretchable Electronics)

  • 박진영;이원재;남현진;좌성훈
    • 마이크로전자및패키징학회지
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    • 제25권4호
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    • pp.25-34
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    • 2018
  • In this paper, we review the latest technical progress and commercialization of stretchable interconnectors, stretchable strain sensors, and stretchable substrates for stretchable electronics. The development of stretchable electronics can pave a way for new applications such as wearable devices, bio-integrated devices, healthcare and monitoring, and soft robotics. The essential components of stretchable electronic devices are stretchable interconnector and stretchable substrate. Stretchable interconnector should have high stretchability and high electrical conductivity as well as stability under severe mechanical deformation. Therefore several nanocomposite-based materials using CNT, graphene, nanowire, and metal flake have been developed. Geometric engineering such as wavy, serpentine, buckled and mesh structure has been well developed. Stretchable substrate should also pose high stretchability and compatibility with stretchable sensing or interconnecting material. We summarize the recent research results of new materials for stretchable interconnector and substrate as well as strain sensors. The Important challenges in development of the stretchable interconnector and substrate are also briefly discussed.

Investigation of Feasibility of Tunneling Field Effect Transistor (TFET) as Highly Sensitive and Multi-sensing Biosensors

  • Lee, Ryoongbin;Kwon, Dae Woong;Kim, Sihyun;Kim, Dae Hwan;Park, Byung-Gook
    • JSTS:Journal of Semiconductor Technology and Science
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    • 제17권1호
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    • pp.141-146
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    • 2017
  • In this letter, we propose the use of tunneling field effect transistors (TFET) as a biosensor that detects bio-molecules on the gate oxide. In TFET sensors, the charges of target molecules accumulated at the surface of the gate oxide bend the energy band of p-i-n structure and thus tunneling current varies with the band bending. Sensing parameters of TFET sensors such as threshold voltage ($V_t$) shift and on-current ($I_D$) change are extracted as a function of the charge variation. As a result, it is found that the performances of TFET sensors can surpass those of conventional FET (cFET) based sensors in terms of sensitivity. Furthermore, it is verified that the simultaneous sensing of two different target molecules in a TFET sensor can be performed by using the ambipolar behavior of TFET sensors. Consequently, it is revealed that two different molecules can be sensed simultaneously in a read-out circuit since the multi-sensing is carried out at equivalent current level by the ambipolar behavior.

강우에 의한 돌발 산사태 예·경보 시스템 구축 방안 (Development Method of Early Warning Systems for Rainfall Induced Landslides)

  • 김성필;봉태호;배승종;박재성
    • 한국농공학회논문집
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    • 제57권4호
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    • pp.135-141
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    • 2015
  • The objective of this study is to develop an early warning system for rainfall induced landslides. For this study, we suggested an analysis process using rainfall forecast data. 1) For a selected slope, safety factor with saturated depth was analyzed and safety factor threshold was established (warning FS threshold=1.3, alarm FS threshold=1.1). 2) If rainfall started, saturated depth and safety factor was calculated with rainfall forecast data, 3) And every hour after safety factor is compared with threshold, then warning or alarm can issued. In the future, we plan to make a early warning system combined with the in-situ inclinometer sensors.

Tetraethoxysilane의 졸-겔 반응을 이용한 전기화학적 glucose biosenor 개발 (Development of Glucose Biosensor Using Sol-Gel Reaction of Tetraethoxysilane)

  • 장승철;박덕수
    • 센서학회지
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    • 제21권4호
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    • pp.311-317
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    • 2012
  • Disposable amperometric screen-printed biosensor strips have been fabricated by a sol-gel encapsulation for the analysis of glucose. The glucose oxidase(GOx) is entrapped in the gel matrix through sol-gel transition of tetraethoxysliane(TEOS). The biosensor is fabricated by GOx containing thin film of TEOS gel on the surface of screen-printed carbon electrode(SPCE). The GOx-containing thin film of TEOS gel offers a one-step modification process on the surface of SPCE. The optimum conditions for glucose determination have been characterized with respect to the applied potential, enzyme loading ratio, and pH. The linear range and detection limit of glucose detection were from 2.0 mM to 16.0 mM and 0.25 mM, respectively.

역삼각형 모양을 갖는 마이크로 채널에서의 전기역학적 흐름전위 검출 (Electrokinetic streaming potential detection in a triangular-shaped microchannel)

  • 조성식;박제균
    • 센서학회지
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    • 제16권2호
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    • pp.115-119
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    • 2007
  • We report electrokinetic streaming potential detection in a microchannel. Streaming potential, one of the representative electrokinetic phenomena, becomes noticeable either when the channel size reduces or when the concentration of electrolyte reduces. We suggest a triangular-shaped microchannel to enhance streaming potential. The triangular-shaped microchannel shows better performance than the straight one in terms of streaming potential. Couple of possible methods to enhance streaming potential is also discussed. Moreover, this type of channel and phenomenon can be applied to biological sensor application and energy transduction.

자이로센서와 LED를 이용한 마우스 개발 (Development of a computer mouse using gyro-sensors and LEDs)

  • 박민제;강신욱;김수찬
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2008년도 학술대회 논문집 정보 및 제어부문
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    • pp.229-230
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    • 2008
  • 본 연구에서는 자동차 사고나 뇌졸중 등에 의해 경추 이하의 마비나 손, 발 등의 움직임은 자유롭지 않은 사람들의 컴퓨터 사용을 돕고자 손이나 발을 이용하지 않고 머리의 움직임과 눈의 깜박임만으로 컴퓨터 마우스 제어가 가능한 장치를 제안하였다. 마우스의 좌우, 상하 이동은 자이로센서를 이용하여 머리의 움직임으로 유발하고, 클릭과 더블 클릭은 광 센서를 시야를 방해하지 않는 위치에 장착하여 감지할 수 있도록 하였다. 제안한 장치의 클릭과 더블 클릭의 인식율은 사용자가 몇 번의 학습으로 높일 수 있었고, 반응속도는 기존 마우스의 이동 속도와 비교해 볼 때 큰 차이는 없었다. 마지막으로 종합적인 평가를 위해 마우스 이동과 클릭을 동시에 수행하였을 경우에는 정확도가 $80{\sim}90%$ 정도로 기존 마우스보다는 낮았다.

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유체영동 기반의 입자분리현상을 이용한 세포 크기 측정방법 (Microfluidic cell sizing using hydrophoretic size-based separation)

  • 최성용;박제균
    • 센서학회지
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    • 제17권4호
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    • pp.245-249
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    • 2008
  • This paper presents a microfluidic cell sizing method using hydrophoretic size-based separation. By exploiting slanted obstacles in a microchannel, we can generate a lateral pressure gradient so that microparticles can be deflected and arranged along lateral flows induced by the gradient. Using such movement of particles, we discriminated 8 to 15 μm-sized beads. We measured the size of U937 cells by comparing the hydrophoretic response of the cells to those of the size-standard beads whose diameters are known. Due to its simple design and fabrication, the sizing method can be easily integrated with other microfluidic components such as cell culture chambers conducting on-chip sizing and sorting.

Imaging the Enzymatic Reaction of Urease Using Liquid Crystal-Based pH Sensor

  • Hu, Qiong-Zheng;Jang, Chang-Hyun
    • Bulletin of the Korean Chemical Society
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    • 제32권12호
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    • pp.4377-4381
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    • 2011
  • In this study, real-time and label-free methods for monitoring the enzymatic reaction of urease, which releases ammonia through the hydrolysis of urea in an aqueous solution, were developed using a liquid crystal (LC)-based pH sensor. Nematic liquid crystal 4-cyano-4'-pentylbiphenyl (5CB), doped with 4'-pentyl-biphenyl-4-carboxylic acid (PBA), exhibited a shift in optical appearance from bright to dark when it was in contact with ammonia generated from the enzymatic reaction between urease and urea. This optical change was attributed to the anchoring transitions of LCs caused by hydrophobic interactions between the tails of deprotonted PBA ($PBA^-$) molecules and the LCs at the aqueous/LC interface. This novel technique holds great promise for the sensitive detection of urease along with its substrates and inhibitors.

생체신호계측을 위한 체내 이식형 무선송수신 시스템 개발 (Development of a transcutaneous system for implantable bio-signal measurement)

  • 이승하
    • 센서학회지
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    • 제17권1호
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    • pp.23-28
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    • 2008
  • In order to measure bio-signals, it is desirable to build a fully implantable system which connects directly to neural pathways or body tissue. A design scheme for fully implementable measurement system is proposed in this paper. Consisting of an implanted module and an external system, the proposed scheme delivers power and data between the two modules. The external module sends power via inductive link using a simple H-bridge type oscillator. Also, the implanted module sends measured data to the external system utilizing R/F communication technique at a frequency of ISM band. A stable communication and operation is achieved as the two types of channels are separated. Implemented in a compact size enough to be implanted in human body, the system exhibits good performance in experimental studies.