• Title/Summary/Keyword: paper sensor

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CMOS 형 이미지 센서와 응용

  • 정차근;양성현;조경록
    • 방송과미디어
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    • 제5권1호
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    • pp.59-71
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    • 2000
  • This paper presents a survey of the CMOs-based image sensor and its applications to various real field digital camera. CMOS image sensor, called active pixel sensor (APS), has many interesting properties such ash I회 sensitivity, high speed readout, random access and lower power consumption when it is compared with CCd. this paper also addresses the state-of-the-art of CMOS image sensor, and gives some examples of its application to digital camera and special-purpose cameras. with the advancement of semiconductor technology, CMOS image sensor is a future technology for imaging system, and will be widely used in the filed of image capturing for consumer electronics and scientific measurements.

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Switched Reluctance Motor의 Single Position Sensor 구동에 관한연구 (A Study on Single Position Driving Meethod of Switched Reluctance Motor)

  • 정윤철
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2000년도 전력전자학술대회 논문집
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    • pp.709-712
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    • 2000
  • In general three position sensors are needed to drive three phases SRM. Single position sensor driving method for three phases Switched Reluctance Motor(SRM) is proposed in this paper. By using single position sensor the cost of SRM is reduced. But position sensor the cost of SRM is reduced. But position detection at the staring is needed for single position sensor driving method. In this paper we propose the active align method to detect the relative position of rotor to three phases and align to the nearest phase. We proved the validity of the method by experiment and compare with other method.

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일반적인 센서잡음상관에 이용되는 도래방향각 예측 방법 (A Direction Finding Method for General Sensor Noise Correlation)

  • 이일근
    • 한국통신학회논문지
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    • 제17권4호
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    • pp.379-386
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    • 1992
  • In this paper a direction finding method which can which can estimate the direction angles of source signals impinging on the sensor array in which sensor noises are correlated is studied. This method performs the estimation of source direction angles form sensors, regardless of sensor noise correlation, by eliminating the sensor noise correlation coefficient which can be accurately estimated. Finally, this paper shows, through the computer simulation, that the proposed, method is extremely useful and superior when there exists the noise correlation between sensors, .

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무선 센서 네트워크망에서의 효율적인 키 관리 프로토콜 분석 (Analyses of Key Management Protocol for Wireless Sensor Networks in Wireless Sensor Networks)

  • 김정태
    • 한국정보통신학회:학술대회논문집
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    • 한국해양정보통신학회 2005년도 추계종합학술대회
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    • pp.799-802
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    • 2005
  • In this paper, we analyses of Key Management Protocol for Wireless Sensor Networks in Wireless Sensor Networks. Wireless sensor networks have a wide spectrum of civil military application that call for security, target surveillance in hostile environments. Typical sensors possess limited computation, energy, and memory resources; therefore the use of vastly resource consuming security mechanism is not possible. In this paper, we propose a cryptography key management protocol, which is based on identity based symmetric keying.

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Development of a New On-line fiber Orientation Sensor Based on Dielectric Anisotropy

  • Nagata, Shinichi
    • 펄프종이기술
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    • 제34권5호
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    • pp.49-55
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    • 2002
  • A new method is proposed for the on-line measurement of the fiber orientation of sheet materials. The measurement of fiber orientation is very important in manufacturing paper sheets, non-woven fabrics, and glass sheets, because fiber orientation strongly affects product properties represented by, for example, dimensional stability of paper. A method developed in this research utilizes anisotropy of dielectric constants of sheet materials as a key characteristic to determine the fiber orientation. The new on-line sensor, consisting of 5 microwave dielectric resonators set in different directions, was designed to detect the fiber orientation while paper is running with high speed on a paper machine. This sensor can determine the direction and the degree of fiber orientation from the measured direction of the maximal dielectric constant and its variation, respectively. The fundamental performance of this system was examined by the static measurement of printing grade paper, which gave a satisfactory result. Then, the dynamic measurements were done at a speed of 1,000 m/min by using a high-speed test-coating machine.

네트워크 커버리지를 이용한 센서 레지스트리 시스템 확장 (Extending Sensor Registry System Using Network Coverage Information)

  • 정현준;정동원;이석훈;백두권
    • 정보처리학회논문지:소프트웨어 및 데이터공학
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    • 제4권9호
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    • pp.425-430
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    • 2015
  • 센서 레지스트리 시스템(Sensor Registry System, SRS)은 이기종 센서 네트워크 환경에서 센서 데이터의 즉각적 활용 및 끊김 없는 해석을 위해 사용자에게 센서 메타데이터를 제공한다. 하지만 기존 SRS는 네트워크 연결이 지원되지 않거나 신호가 불안정한 경우에 센서 메타데이터를 안정적으로 제공할 수 없다. 이 논문에서는 이러한 문제를 해결하기 위해, 네트워크 커버리지 정보를 이용한 센서 레지스트리 시스템 확장 방법을 제안한다. 제안 방법은 예측한 경로와 네트워크 커버리지에 대한 오픈 데이터(통신사, 신호 강도, 통신 타입)를 이용하여 사용자가 불안정한 네트워크 지역에 도착하기 전에 해당 지역의 센서 메타데이터를 추가로 송신한다. 이 논문에서 제안한 확장된 SRS는 사용자에게 보다 안정적으로 센서 메타데이터를 제공함으로써 응용서비스의 품질을 향상시킨다.

Novel Architecture of Self-organized Mobile Wireless Sensor Networks

  • Rizvi, Syed;Karpinski, Kelsey;Razaque, Abdul
    • Journal of Computing Science and Engineering
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    • 제9권4호
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    • pp.163-176
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    • 2015
  • Self-organization of distributed wireless sensor nodes is a critical issue in wireless sensor networks (WSNs), since each sensor node has limited energy, bandwidth, and scalability. These issues prevent sensor nodes from actively collaborating with the other types of sensor nodes deployed in a typical heterogeneous and somewhat hostile environment. The automated self-organization of a WSN becomes more challenging as the number of sensor nodes increases in the network. In this paper, we propose a dynamic self-organized architecture that combines tree topology with a drawn-grid algorithm to automate the self-organization process for WSNs. In order to make our proposed architecture scalable, we assume that all participating active sensor nodes are unaware of their primary locations. In particular, this paper presents two algorithms called active-tree and drawn-grid. The proposed active-tree algorithm uses a tree topology to assign node IDs and define different roles to each participating sensor node. On the other hand, the drawn-grid algorithm divides the sensor nodes into cells with respect to the radio coverage area and the specific roles assigned by the active-tree algorithm. Thus, both proposed algorithms collaborate with each other to automate the self-organizing process for WSNs. The numerical and simulation results demonstrate that the proposed dynamic architecture performs much better than a static architecture in terms of the self-organization of wireless sensor nodes and energy consumption.

초음파 센서을 이용한 자율 이동 로봇의 써튼티 그리드 형성 (Sonar-Based Certainty Grids for Autonomous Mobile Robots)

  • 임종환;조동우
    • 대한전기학회논문지
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    • 제39권4호
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    • pp.386-392
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    • 1990
  • This paper discribes a sonar-based certainty grid, the probabilistic representation of the uncertain and incomplete sensor knowledge, for autonomous mobile robot navigation. We use sonar sensor range data to build a map of the robot's surroundings. This range data provides information about the location of the objects which may exist in front of the sensor. From this information, we can compute the probability of being occupied and that of being empty for each cell. In this paper, a new method using Bayesian formula is introduced, which enables us to overcome some difficulties of the Ad-Hoc formula that has been the only way of updating the grids. This new formula can be applied to other kinds of sensors as well as sonar sensor. The validity of this formula in the real world is verified through simulation and experiment. This paper also shows that a wide angle sensor such as sonar sensor can be used effectively to identify the empty area, and the simultaneous use of multiple sensors and fusion in a certainty grid can improve the quality of the map.

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센서방식 태양광 발전시스템의 효율개선을 위한 새로운 추적알고리즘 개발 (Development of a novel tracking for efficiency improvement of PV system with sensor method)

  • 장미금;고재섭;최정식;강성준;백정우;정동화
    • 한국조명전기설비학회:학술대회논문집
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    • 한국조명전기설비학회 2009년도 춘계학술대회 논문집
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    • pp.424-427
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    • 2009
  • This paper reposes a novel tracking algerian for efficiency improvement of photovoltaic(PV) system using sensor method PV system of sensor method is exactly impossible to track a sun position when insolation is low or rapidly changed by the clouds and fogs. Also, in this case, tracking device is occurred energy consumption by unnecessary operating. This statement of reason, real power of PV system is not increased than fixed PV system in specified location. Therefore, this paper proposes a novel ticking algorithm considered insolation for efficiency improvement of PV system using sensor method And this paper analyzes the generation volume and proves the validity of proposed algorithm as compared with the conventional PV tracking system using sensor method.

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센서방식 태양광 발전시스템의 효율개선을 위한 새로운 추적알고리즘 개발 (Development of a Novel Tracking for Efficiency Improvement of PV System with Sensor Method)

  • 최정식;고재섭;정동화
    • 전기학회논문지
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    • 제58권11호
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    • pp.2192-2199
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    • 2009
  • This paper proposes a novel tracking algorithm for efficiency improvement of photovoltaic(PV) system using sensor method. PV system of sensor method is exactly impossible to track a sun position when insolation is low or rapidly changed by the clouds and fogs. Also, in this case, tracking device is occurred energy consumption by unnecessary operating. This statement of reason, real power of PV system is not increased than fixed PV system in specified location. Therefore, this paper proposes a novel tracking algorithm considered insolation for efficiency improvement of PV system using sensor method. And this paper analyzes the generation volume and proves the validity of proposed algorithm as compared with the conventional PV tracking system using sensor method.