• 제목/요약/키워드: Multi line

검색결과 1,691건 처리시간 0.046초

공중 전화회선용 다중 채널 ECG데이터 원격 측정시스템 설계 (A Design of Multi-Channel Biotelemetry for ECG Encoding and Transmission Over the Public Telephone Line)

  • 계신웅;장원석;홍승홍
    • 대한의용생체공학회:의공학회지
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    • 제7권1호
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    • pp.21-34
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    • 1986
  • In this paper, we described the ECG telemetry system via the Public Telephone Line. The system consist of a signal acquisition and measurement section, a signal processing section, and a signal transmission section. It used 8 bits microprocessor. The transmission section is composed of 3 ch. analog modulators and 1 ct. digital modem. Especially, using the digital modem, signal is transmitted with about 50n data reduction ratio by the TP (Turning Point) algorithm. The acoustic coupler or inductive coil for linking the public telephone line are used. The speed of the digital modem is 300 baud rate. The MCBS (Multi Channel Biotelemetry System) is tested and evaluated through the experiment.

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LOS 알고리듬과 미지 입력 관측기에 기초한 선도-추종 대형 제어 (LOS (Line of Sight) Algorithm and Unknown Input Observer Based Leader-Follower Formation Control)

  • 윤석민;여태경;박성재;홍섭;김상봉
    • 제어로봇시스템학회논문지
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    • 제16권3호
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    • pp.207-214
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    • 2010
  • This paper proposes about decentralized control approach based Leader-Follower formation control using LOS (Line of Sight) algorithm and unknown input observer. The position of robots which is a basic information in multi-robot or single robot motion control is determined by localization algorithm fusing UPS (Ultrasonic Position System) and kinematics model. For formation control, a decentralized control approach individually installing a local controller in leader and follower robot is adopted. Leader robot is controlled to track a specified trajectory by LOS algorithm, and the other robots follow the leader by local controller based on tracking platoon level function, self-sensing data and estimated information from unknown input observer. The performance of proposed method is proven through the formation experiment of two vehicle models.

Multi-Step Commutation and Control Policies for Matrix Converters

  • Hofmann, Wilfried;Ziegler, Marcus
    • Journal of Power Electronics
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    • 제3권1호
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    • pp.24-32
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    • 2003
  • The commutation and control in matrix converters is more complicated as in voltage source converters. Natural freewheeling paths do not exist and the theoretic absent storage elements result in a direct coupled system of load and line currents as well as voltages. The paper offers an overview about staggered commutation and control policies in matrix converters. Based on the knowledge about load current direction and the signs of the line to line input voltages different multi-step commutation policies were derived. This paper examines the application of that policies in the case of space vector modulation and direct control methods with the focus on the resulting effects to the reference output voltage deviation.

Multi-Agent 송전계통 보호시스템에서의 새로운 거리계전 알고리즘 (A Novel Distance Relaying Algorithm in a Multi-Agent Protection System of transmission line)

  • 문현경;진보건;현승호;이승재
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2003년도 추계학술대회 논문집 전력기술부문
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    • pp.217-219
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    • 2003
  • This paper presents a distance relaying algorithm for a transmission line protection with MAS. First, the voltage and fault current of the opposite side are represented as a function of those of the measuring end using source voltages of both ends. These voltages are assumed to be obtained from the transformers protecting agents, periodically in normal state. Then, the fault location expression, independent of fault resistance, is derived with voltage and current in only one end of faulted line used. The suggested algorithm is applied to a simple system with two power sources to show its effectiveness.

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변압기 상태의 온라인 감시 체계 구축에 대한 연구 동향 (A Research Trend on Multi-Agent Transformer Condition Monitoring System On-Line)

  • 김정훈;용형식;최용성;이경섭
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2007년도 제38회 하계학술대회
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    • pp.2006-2007
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    • 2007
  • On-line condition monitoring is a useful tool for maintaining and extending the longevity of power transformers. An intelligent diagnostic system is desirable for operational safety and reliability. Bringing these concepts together results in a powerful support tool for engineers, reducing the volume of data to deal with, and making the data more meaningful. This paper describes how a multi-agent system for diagnosing the cause of transformer partial discharge activity was coupled with a method of UHF partial discharge monitoring, creating an on-line condition monitoring system. The challenges presented by the on-site environment are discussed, along with the implications for the complete system.

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디커플링 방법을 이용한 RC-Coupled 배선의 해석적 지연시간 예측 모델 (An Analytical Switching-Dependent Timing Model for Multi-Coupled VLSI Interconnect lines)

  • 김현식;어영선;심종인
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 2004년도 하계종합학술대회 논문집(2)
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    • pp.439-442
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    • 2004
  • Timing delays due to VLSI circuit interconnects strongly depend on neighbor line switching patterns as well as input transition time. Considering both the input transition and input switching pattern, a new analytical timing delay model is developed by using the decoupling technique of transfer multi-coupled lines into an effective single line. The analytical timing delay model can determine the timing delay of multi-coupled lines accurately as well as rapidly. It is verified by using DSM-Technology ($0.1{\mu}m$ /low-k copper-based process) that the model has excellent agreement with the results of SPICE simulation.

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능동방음벽을 위한 다중채널 능동소음제어 시스템의 구현 (Implementation of multi-channel active noise control systems for active barriers)

  • 최정일;조현기;남현도;안동준
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2011년도 제42회 하계학술대회
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    • pp.2007-2008
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    • 2011
  • In this paper, we implemented active noise control systems for active barriers with attenuation of road noise. And then we constructed by multi-channel audio systems and DAQ part, high performance DSP H/W. Active noise control firmware program was implemented for multi-channel off-line/on-line estimation methods for secondary path transfer functions and FIR/IIR filter structure main noise control algorithms. To evaluate performance of implemented systems, active barriers test bed was implemented and several experiments was performed by various noise cases.

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CSL-NOR형 SONOS 플래시 메모리의 멀티비트 적용에 관한 연구 (Investigation for Multi-bit per Cell on the CSL-NOR Type SONOS Flash Memories)

  • 김주연;안호명;이명식;김병철;서광열
    • 한국전기전자재료학회논문지
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    • 제18권3호
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    • pp.193-198
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    • 2005
  • NOR type flash 32 ${\times}$ 32 way are fabricated by using the typical 0.35 ${\mu}{\textrm}{m}$ CMOS process. The structure of array is the NOR type with common source line. In this paper, optimized program and erase voltage conditions are presented to realize multi-bit per cell at the CSL-NOR array. These are considered selectivity of selected bit and disturbances of unselected bits. Retention characteristics of locally trapped-charges in the nitride layer are investigated. The lateral diffusion and vertical detrapping to the tunneling oxide of locally trapped charges as a function of retention time are investigated by using the charge pumping method. The results are directly shown by change of the trapped-charges quantities.

Novel Calibration Method for the Multi-Camera Measurement System

  • Wang, Xinlei
    • Journal of the Optical Society of Korea
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    • 제18권6호
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    • pp.746-752
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    • 2014
  • In a multi-camera measurement system, the determination of the external parameters is one of the vital tasks, referred to as the calibration of the system. In this paper, a new geometrical calibration method, which is based on the theory of the vanishing line, is proposed. Using a planar target with three equally spaced parallel lines, the normal vector of the target plane can be confirmed easily in every camera coordinate system of the measurement system. By moving the target into more than two different positions, the rotation matrix can be determined from related theory, i.e., the expression of the same vector in different coordinate systems. Moreover, the translation matrix can be derived from the known distance between the adjacent parallel lines. In this paper, the main factors effecting the calibration are analyzed. Simulations show that the proposed method achieves robustness and accuracy. Experimental results show that the calibration can reach 1.25 mm with the range about 0.5m. Furthermore, this calibration method also can be used for auto-calibration of the multi-camera mefasurement system as the feature of parallels exists widely.

축교정을 위한 기하학적 진직도 적응제어기 설계 (Design of a Geometric Adaptive Straightness Controller for Shaft Straightening Process)

  • 김승철;정성종
    • 대한기계학회논문집A
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    • 제24권10호
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    • pp.2451-2460
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    • 2000
  • In order to minimize straightness error of deflected shaft, a geometric adaptive straightness controller system is studied. A multi-step straightening and a three-point bending process have been developed for the geometric adaptive straightness controller. Load-deflection relationship, on-line identification of variations of material properties, on-line springback prediction, and real-time hydraulic control methodology are studied for the three-point bending process. By deflection pattern analysis and fuzzy self-learning method in the multi-step straightening process, a straightening point and direction, desired permanent deflection and supporting condition are determined. An automatic straightening machine has been fabricated for rack bars by using the developed ideas. Validity of the proposed system is verified through experiments.