• Title, Summary, Keyword: Optical logic

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Development of a Transcutaneous Optical Information Transmission System for Total Artificial Heart Using Near Infrared Laser

  • Lee, Jung-Hoon;Kim, Wook-Eun;Choi, Jong-Hoon;Ahn, Jae-Mok;Min, Byoung-Goo
    • Proceedings of the KOSOMBE Conference
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    • v.1997 no.05
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    • pp.64-67
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    • 1997
  • In the total artificial heart(TAH), a transcutaneous information transmission system(TITS) is vely important to monitor the TAH status and detect the device failure, and repair the possible problems. First of all, the communication channel(skin) and method were simulated in terms of transmittance, scattering, reflection and absorption, then the system was designed with size reduction including low power consumption and reliability compared to the previous one. The informations are transmitted through the skin(approximately 1cm in depth) by frequency modulated near infrared(NIR) pulses using 780nm laser diodes as transmitters and photodiode as receiver with high speed and high spectral sensitivity. The logic high and low frequencies are 3MHz, 1MHz respectively. The system is a bidirectional data link for more than 38.4Kbps data rate, full-duplex with a bit error rate of less than $10^{-5}$.

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Development of Attachable HOB Monitoring System with Performance Analysis (부착형 침상머리 각도 모니터링 시스템 개발 및 성능 분석)

  • Gyeong, G.Y.;Park, Y.S.;Lee, Y.S.
    • Journal of rehabilitation welfare engineering & assistive technology
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    • v.8 no.3
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    • pp.197-203
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    • 2014
  • In this paper, we develop an attachable head of bed(HOB) monitoring system, which can prevent ventilator associated pneumonia(VAP), and analyze the performance of the developed HOB monitoring system. The main purpose of the HOB monitoring system is to support visible HOB display for keeping patients' position effectively and collect data for analysis of the relation between HOB elevation and patients' symptom. The HOB monitoring system is developed in attached-type and uses an FIR filter with heuristic logic to remove the unwanted noise. The optical encoder is used for the performance analysis of the developed HOB monitoring system.

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An Indoor Positioning System for Mobile Robots Using Visible Light Communication and Fuzzy Logic (가시광 통신과 퍼지 논리를 이용한 모바일 로봇의 실내 위치 인식 시스템)

  • Kim, Jun-Young;Kim, Ji-Su;Kang, Geun-Taek;Lee, Won-Chang
    • Journal of Institute of Control, Robotics and Systems
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    • v.22 no.2
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    • pp.75-82
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    • 2016
  • Visible light communication (VLC) using LED lamps is suitable for implementing an indoor positioning system in an indoor environment where the global positioning system (GPS) signal does not reach. In this paper, we present an indoor positioning system for mobile robots using a VLC beacon and fuzzy rules. This system consists of an autonomous mobile robot, VLC modules, and device application software. Fuzzy rules are applied to plan the global and local paths along which the mobile robot navigates indoors. The VLC transmitter modules are attached to the wall or the ceiling as beacons to transmit their own location information. The variable pulse position modulation (VPPM) algorithm is used to transmit data, which is a new modulation scheme for VLC providing a dimming control mechanism for flicker-free optical communication. The mobile robot has a receiver module to receive the location information while performing its mission in the environment where VLC transmitters are deployed.

A Study on the Improvement of the Image Quality for UAV Using Drift Compensation (편류보정을 통한 무인항공기 영상품질 향상에 관한 연구)

  • Lee, Mal-Young
    • Journal of the Korean Society for Quality Management
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    • v.41 no.3
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    • pp.405-412
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    • 2013
  • Purpose: In this paper, the improvement of the image quality is investigated. The image quality is degraded by the drift phenomenon of EO/IR (Electro-Optical/Infrared) device on UAV. The drift phenomenon means that the image of EO/IR equipment on UAV(Unmanned Aerial Vehicle) moves to the unintended direction. This phenomenon should be improved for successful flight mission. Methods: To improve the drift phenomenon, the drift compensation method, the combination algorithm of FMC(Forward Motion Compensation) and AMC(Angular Motion Compensation) method, are introduced to calculate pitch and azimuth angle. Result values of pitch and azimuth angle are used for the improvement of image quality in EO/IR control logic. Results: The image quality is quantitatively improved more than 15 times through field test data of flight. Conclusion: Using the drift compensation technique, the image quality for EO/IR equipment is improved over 15 times than existing methods. This means the user of UAV with EO/IR device can perform a successful mission by keeping the line of sight for the target accurately.

Mechanical verification logic and first test results for the Euclid spacecraft

  • Calvi, Adriano;Bastia, Patrizia;Suarez, Manuel Perez;Neumann, Philipp;Carbonell, Albert
    • Advances in aircraft and spacecraft science
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    • v.7 no.3
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    • pp.251-269
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    • 2020
  • Euclid is an optical/near-infrared survey mission of the European Space Agency (ESA) to investigate the nature of dark energy, dark matter and gravity by observing the geometry of the Universe and the formation of structures over cosmological timescales. The Euclid spacecraft mechanical architecture comprises the Payload Module (PLM) and the Service Module (SVM) connected by an interface structure designed to maximize thermal and mechanical decoupling. This paper shortly illustrates the mechanical system of the spacecraft and the mechanical verification philosophy which is based on the Structural and Thermal Model (STM), built at flight standard for structure and thermal qualification and the Proto Flight Model (PFM), used to complete the qualification programme. It will be submitted to a proto-flight test approach and it will be suitable for launch and flight operations. Within the overall verification approach crucial mechanical tests have been successfully performed (2018) on the SVM platform and on the sunshield (SSH) subsystem: the SVM platform static test, the SSH structure modal survey test and the SSH sine vibration qualification test. The paper reports the objectives and the main results of these tests.

A Light Incident Angle Stimulated Memristor Based on Electrochemical Process on the Surface of Metal Oxide

  • Park, Jin-Ju;Yong, Gi-Jung
    • Proceedings of the Korean Vacuum Society Conference
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    • pp.174-174
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    • 2014
  • Memristor devices are one of the most promising candidate approaches to next-generation memory technologies. Memristive switching phenomena usually rely on repeated electrical resistive switching between non-volatile resistance states in an active material under the application of an electrical stimulus, such as a voltage or current. Recent reports have explored the use of variety of external operating parameters, such as the modulation of an applied magnetic field, temperature, or illumination conditions to activate changes in the memristive switching behaviors. Among these possible choices of signal controlling factors of memristor, photon is particularly attractive because photonic signals are not only easier to reach directly over long distances than electrical signal, but they also efficiently manage the interactions between logic devices without any signal interference. Furthermore, due to the inherent wave characteristics of photons, the facile manipulation of the light ray enables incident light angle controlled memristive switching. So that, in the tautological sense, device orienting position with regard to a photon source determines the occurrence of memristive switching as well. To demonstrate this position controlled memory device functionality, we have fabricated a metal-semiconductor-metal memristive switching nanodevice using ZnO nanorods. Superhydrophobicity employed in this memristor gives rise to illumination direction selectivity as an extra controlling parameter which is important feature in emerging. When light irradiates from a point source in water to the surface treated device, refraction of light ray takes place at the water/air interface because of the optical density differences in two media (water/air). When incident light travels through a higher refractive index medium (water; n=1.33) to lower one (air; n=1), a total reflection occurs for incidence angles over the critical value. Thus, when we watch the submerged NW arrays at the view angles over the critical angle, a mirror-like surface is observed due to the presence of air pocket layer. From this processes, the reversible switching characteristics were verified by modulating the light incident angle between the resistor and memristor.

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