• Title/Summary/Keyword: Cell-based sensor

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A Structured Growth Model of Scutellaria baicalensis G. Plant Cell (Scutellaria baicalensis G. 식물 세포의 구조적 성장 모델)

  • 최정우;조진만;이정건;이원홍;김익환;박영훈
    • KSBB Journal
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    • v.13 no.3
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    • pp.251-258
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    • 1998
  • A structured kinetic model is proposed to describe cell growth and secondary metabolite, flavone glycosides, synthesis in batch suspension culture of Scutellaria baicalensis G. The model has been developed by representing the physiological state of cell described as the activity and viability which can be estimated based on the culture fluorescence. In the model, three type of cells are considered; active-viable, nonactive-viable and dead cells. Viable cell weight could be determined based on the relative fluorescence intensity. The flavone glycosides could be produced by both active-viable and non-active viable cells with a different production rate. And the model includes the cell expansion due to glucose concentration and death phase which accounts for the release of intracellular secondary metabolite into medium. Dependent variables include substrate concentration(glucose), cell mass(dry cell weight and fresh cell weight), product concentration(flavone glycosides), activity and viability. Satisfactory agreement between the model and experimental data is obtained from shake flask culture of Scutellaria baicalensis G. The proposed model can predict the cell growth and flavone glycosides synthesis as well as intermediate materials.

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Development of wearable Range of Motion measurement device capable of dynamic measurement

  • Song, Seo Won;Lee, Minho;Kang, Min Soo
    • International journal of advanced smart convergence
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    • v.8 no.4
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    • pp.154-160
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    • 2019
  • In this paper, we propose the miniaturization size of wearable Range of Motion(ROM) and a system that can be connected with smart devices in real-time to measure the joint movement range dynamically. Currently, the ROM of the joint is directly measured by a person using a goniometer. Conventional methods are different depending on the measurement method and location of the measurement person, which makes it difficult to measure consistently and may cause errors. Also, it is impossible to measure the ROM of joints in real-life situations. Therefore, the wearable sensor is attached to the joint to be measured to develop a miniaturize size ROM device that can measure the range of motion of the joint in real-time. The sensor measured the resistance value changed according to the movement of the joint using a load cell. Also, the sensed analog values were converted to digital values using an Analog to Digital Converter(ADC). The converted amount can be transmitted wireless to the smart device through the wearable sensor node. As a result, the developed device can be measured more consistently than the measurement using the goniometer, communication with IoT-based smart devices, and wearable enables dynamic observation. The developed wearable sensor node will be able to monitor the dynamic state of rehabilitation patients in real-time and improve the rapid change of treatment method and customized treatment.

Detection of Partial Discharge Acoustic Signal Using the Optical Fiber Interferometric Sensor (광섬유 간섭계 센서를 이용한 부분방전 음압 측정)

  • 이종길;박윤석;이준호
    • The Journal of the Acoustical Society of Korea
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    • v.21 no.7
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    • pp.614-623
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    • 2002
  • In this paper, it was manufactured an interferometric optical fiber sensor and measured partial discharge acoustic signal caused by defect of power facilities such as power cables, transformers and gas insulation. Acrylic and aluminium mandrels wound with fiber-optic were chosen as optical fiber sensor, Sagnac and Mach-Zehnder interferometers were chosen to detect discharge acoustic signals. The two fiber optic interferometers were identified by using the PZT. Discharge experimentation set in the discharge imitation cell in oil tank and the discharge phenomena was generated. Based on the experimental result, to detect the discharge acoustic signal, Sagnac interferometer can detect stably the acoustic signal than the Mach-Zehnder interferometer. It is shown that Sagnac optical fiber sensor can detect the discharge acoustic signals effectively.

A Hexagon Tessellation Approach for the Transmission Energy Efficiency in Underwater Wireless Sensor Networks

  • Kim, Sung-Un;Cheon, Hyun-Soo;Seo, Sang-Bo;Song, Seung-Mi;Park, Seon-Yeong
    • Journal of Information Processing Systems
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    • v.6 no.1
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    • pp.53-66
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    • 2010
  • The energy efficiency is a key design issue to improve the lifetime of the underwater sensor networks (UWSN) consisting of sensor nodes equipped with a small battery of limited energy resource. In this paper, we apply a hexagon tessellation with an ideal cell size to deploy the underwater sensor nodes for two-dimensional UWSN. Upon this setting, we propose an enhanced hybrid transmission method that forwards data packets in a mixed transmission way based on location dependent direct transmitting or uniform multi-hop forwarding. In order to select direct transmitting or uniform multi-hop forwarding, the proposed method applies the threshold annulus that is defined as the distance between the cluster head node and the base station (BS). Our simulation results show that the proposed method enhances the energy efficiency compared with the existing multi-hop forwarding methods and hybrid transmission methods

A Locating Scheme for Moving Objects Based on IEEE 802.15.4a (IEEE 802.15.4a에 기반한 이동체 위치 인식 기술)

  • Han, Young-Kou;Park, Jun-Seok;Seong, Yeong-Rak;Oh, Ha-Ryoung
    • Journal of The Institute of Information and Telecommunication Facilities Engineering
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    • v.8 no.3
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    • pp.132-137
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    • 2009
  • In this paper, a position recognition system is designed, implemented, and tested using IEEE 802.15.4a PHY (CSS) hardware and Tiny OS environment. The system is designed with extensibility and flexibility. The system consists of five kinds of nodes which have different functions from each other. Three communication channels are used for collision avoidance. In each cell, an arbiter node is used to minimize message collisions. The proposed arbitration protocol is designed to support mobility of arbitrary target nodes. Target nodes calculates their locations with communications to four location reference nodes which are placed on the comers of each cell.

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Energy-Efficient Grid-based Hole-Detouring Scheme in Wireless Sensor Networks (무선센서네트워크에서 에너지 효율적인 그리드 기반의 홀 우회 방식)

  • Kim, Sung-Hwi;Park, Ho-Sung;Lee, Jeong-Cheol;Kim, Sang-Ha
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.37 no.4B
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    • pp.227-235
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    • 2012
  • Holes that generated by the unpredictable and harsh nature application environment or uneven energy consumption are an inevitable phenomenon in wireless sensor networks. Most of the existing schemes for this hole problem tend to use a static detour path to bypass a hole. The static detour path may lead to uneven energy consumption of the nodes on the boundary of the hole, thus it may enlarge the region of holes. At the same time, traffic would concentrate on the nodes on the boundary of the hole and tend to be depleted quickly. To solve this problem, we introduce energy-efficient grid-based geographic routing and hole-detouring scheme by taking advantage of grid anchor point in wireless sensor network with holes. The location of hole detour anchor node is dynamically shifted in grid cell. just generating dynamic hole detour paths to reduce total energy consumption. Simulation results are provided to validate the claims.

Implementation of Segway Using Pressure Sensors (압력센서를 이용한 세그웨이 개발)

  • Jo, Sung-Chan;Kang, Su-Min;Huh, Kyung-Moo;Joo, Young-Bok
    • Journal of the Institute of Electronics and Information Engineers
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    • v.50 no.1
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    • pp.285-290
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    • 2013
  • As well as the advanced development of modern society, and the environmental problems caused by the use of fossil fuels is emerging. So do not reap the performance level of the car to be able to replace existing fossil fuel and low-emission energy and technology development are continually strives. Therefore, this study aims to present the direction of the new interface 21st century Mobile Auto Electric Segway technology in the field of security and disadvantages based. The Segway is a problem because the control itself skewed by certain slope where the slope in the wrong adjustment tipping. In this study, the year saw the introduction of two pressure sensors(Load cell) used to solve these drawbacks, according to the ratio of the weight control methods. In addition, the ramps operate in a straightforward, using an acceleration sensor and a gyro sensor in order to compensate for the slope value in free control method to study looked. Measured by calculating the value of the occupant's weight and according to the inclination of the pressure sensor pressure sensing experiment results this year, we can see that the control variable for the change in body weight is greater than the inclination. Segway is also easy to control, and the stability of the ramps, etc. As a result, created using a pressure sensor.

Efficient Processing of Aggregate Queries in Wireless Sensor Networks (무선 센서 네트워크에서 효율적인 집계 질의 처리)

  • Kim, Joung-Joon;Shin, In-Su;Lee, Ki-Young;Han, Ki-Joon
    • Spatial Information Research
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    • v.19 no.3
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    • pp.95-106
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    • 2011
  • Recently as efficient processing of aggregate queries for fetching desired data from sensors has been recognized as a crucial part, in-network aggregate query processing techniques are studied intensively in wireless sensor networks. Existing representative in-network aggregate query processing techniques propose routing algorithms and data structures for processing aggregate queries. However, these aggregate query processing techniques have problems such as high energy consumption in sensor nodes, low accuracy of query processing results, and long query processing time. In order to solve these problems and to enhance the efficiency of aggregate query processing in wireless sensor networks, this paper proposes Bucket-based Parallel Aggregation(BPA). BPA divides a query region into several cells according to the distribution of sensor nodes and builds a Quad-tree, and then processes aggregate queries in parallel for each cell region according to routing. And it sends data in duplicate by removing redundant data, which, in turn, enhances the accuracy of query processing results. Also, BPA uses a bucket-based data structure in aggregate query processing, and divides and conquers the bucket data structure adaptively according to the number of data in the bucket. In addition, BPA compresses data in order to reduce the size of data in the bucket and performs data transmission filtering when each sensor node sends data. Finally, in this paper, we prove its superiority through various experiments using sensor data.

Development of the Integrated Exhaust System and Techniques of Nitrogen and Condensate for Fuel Cell Electric Vehicle (연료전지 자동차용 질소/응축수 통합배출시스템 및 기술 개발)

  • Shim, Hyo Sub;Kim, Hyo Sub;Kim, Jae Hoon;Kwon, Bu Kil;Lee, Hyun Joon;Kim, Chi Myung;Park, Yong Sun
    • Journal of Hydrogen and New Energy
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    • v.25 no.5
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    • pp.516-524
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    • 2014
  • Proper discharge of nitrogen gas and water condensate is required in a conventional fuel cell system for performance, stability and durability of fuel cell stacks. Present study covers the development of integrated unit and its functioning logic for simultaneous nitrogen gas purge and water condensate drainage in a fuel cell vehicle system. Configuration of condensate drainage pipe, purge valve and level sensor is considered and optimized in physical integration. As a key factor, discharge time is considered and optimized based on the test result of constant-current operation with various operating temperature in logic development. Consequently, derived optimal values are applied and verified in actual vehicle drive mode test. Increase of system design flexibility, weight reduction and cost reduction are anticipated with this study. Additional study for physical and logical improvement is currently being implemented.

Optical Simulation Study on Indoor Organic Photovoltaics with Textured Electrodes towards Self-powered Photodetector

  • Biswas, Swarup;Kim, Hyeok
    • Journal of Sensor Science and Technology
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    • v.28 no.4
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    • pp.236-239
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    • 2019
  • In this work, we performed an optical simulation study on the performance of a PMDPP3T:PCBM based on an organic photovoltaic (PV) device. The virtual PV device was developed in Lumerical, finite-difference time-domain (FDTD) solutions. Different layers of the PV cell have been defined through the incorporation of complex refractive index value of those layers' constituent materials. During the simulation study, the effect of the variation active layer thickness on an ideal short circuit current density ($J_{sc,ideal}$) of the PV cell has been, first, observed. Thereafter, we have investigated the impact of surface roughness of a transparent conducting oxide (TCO) electrode on $J_{sc,ideal}$ of the PV cells. From this simulation, it has been observed that the $J_{sc,ideal}$ value of the PV cell is strongly dependent on the thickness of its active layer and the photon absorption of the PV cell has gradually decreased with the increment of the TCO's surface roughness. As a result, the capability of the PV device has been reduced with the increment of the surface roughness of the TCO.