Search results for "SMIS"

showing 10 items of 2316 documents

<title>Safety problems in free space optical transmission</title>

2006

The paper is focused on safety of exploitation of optical transmission devices in free space. The subjects concerning propagation of "open" optical stream and its' possible dangerous influence on environment, mainly living organisms are discussed. An attempt to evaluate an installation and exploitation of transmitting devices was made, concerning dangers, requirements, recommendations and restrictions, concluding from accepted safety standards (IEC 60825- 1 :2005, EN 60825-1 :2005 and in Poland PN-EN 60825-1 :2005 "Safety of laser devices - Equipment classification, requirements and user's guide"; IEC 60825-12:2004, EN 60825-12:2005 and in Poland PN-EN 60825-12:2005 "Safety of free space op…

EngineeringTransmission (telecommunications)Laser safetybusiness.industryFree spaceSafety standardsbusinessTelecommunicationsData transmissionFree-space optical communicationSPIE Proceedings
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Static and Dynamic Comparative Study on the Cardanic Transmission

2015

This paper aims to make a comparative study between the static and the dynamic analysis in the cardanic transmission. The cardanic transmission is done at full scale and is charged as it is in practice, by means of the Solidworks and Cosmos programs. We observe the differences and the tension areas which appear in the cardanic transmission elements and present the findings and the given solutions, according to the study.

EngineeringTransmission (telecommunications)Tension (physics)business.industryCosmos (category theory)Full scaleMechanical engineeringGeneral MedicinebusinessSimulationApplied Mechanics and Materials
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Enhanced LMMSE equalizer for high-speed single frequency network in HSDPA

2011

Currently, considerable interest has been shown in the research and standardization communities in multicell transmission schemes for HSPA, with a number of possible schemes under discussion that include Multiflow, Fast Cell Switching (FCS) and High-Speed Single Frequency Network (HS-SFN). In particular, HS-SFN is a promising technique that not only combines received energy from participating cells, but also reduces intercell interference with low UE complexity. In principle, HS-SFN can be implemented with a small modification to an LMMSE receiver at the UE. This paper introduces a more advanced LMMSE equalizer for High-Speed Single Frequency Network in HSDPA that achieves further performan…

EngineeringTransmission (telecommunications)business.industryCellular radioElectronic engineeringEqualizerSingle-frequency networkHigh-Speed Downlink Packet AccessCell relayInterference (wave propagation)businessEnergy (signal processing)2011 IEEE Swedish Communication Technologies Workshop (Swe-CTW)
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Aggregated Packet Transmission in Duty-Cycled WSNs: Modeling and Performance Evaluation

2017

[EN] Duty cycling (DC) is a popular technique for energy conservation in wireless sensor networks (WSNs) that allows nodes to wake up and sleep periodically. Typically, a single-packet transmission (SPT) occurs per cycle, leading to possibly long delay. With aggregated packet transmission (APT), nodes transmit a batch of packets in a single cycle. The potential benefits brought by an APT scheme include shorter delay, higher throughput, and higher energy efficiency. In the literature, different analytical models have been proposed to evaluate the performance of SPT schemes. However, no analytical models for the APT mode on synchronous DC medium access control (MAC) mechanisms exist. In this …

EngineeringTransmission delayComputer Networks and CommunicationsRetransmissionReal-time computingAerospace EngineeringThroughput02 engineering and technology01 natural sciencesDiscrete-time Markov chain (DTMC) modelPacket switchingPacket lossComputer Science::Networking and Internet Architecture0202 electrical engineering electronic engineering information engineeringElectrical and Electronic EngineeringProcessing delaybusiness.industryNetwork packetComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS010401 analytical chemistry020206 networking & telecommunicationsINGENIERIA TELEMATICA0104 chemical sciencesComputer Science::PerformancePacket aggregationAutomotive EngineeringPerformance evaluationDuty-cycled wireless sensor networksPacket aggregationbusinessComputer network
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Efficiency of Split-Way CVT's. A simplified model

2007

ABSTRACT In this paper, a general formula is obtained for the efficiency of all types of Split-Way CVT, consisting of one or two epicyclic trains, a number of fixed ratio gears and one variable speed unit (CVU). It is based on the application of the principle of virtual works and on the simplifying hypothesis that all the dissipation is lumped inside the CVU. The comparison with some experimental results from the literature shows a surprisingly good fit, also in the neighbourhoods of zero speed ratio. INTRODUCTION The possibility of changing the speed ratio continuously between the primary and the secondary shaft of a mechanical transmission is a very interesting topic, mainly in the automo…

EngineeringVariatorPower Split CVT's Efficiencybusiness.industryDissipationTopologyPower (physics)Variable (computer science)Transmission (telecommunications)TrainClutchbusinessSimulationContinuously variable transmissionSAE Technical Paper Series
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Wind Turbines to Power Telecommunication Systems: A Case Study in Sicily

2011

The ever increasing problems related to air pollution and the difficulties for power lines to reach inaccessible areas are pushing to find new solutions for powering telecommunications equipments (TLC). The renewable energy sys- tems, although relatively expensive, have the required characteristics. The purpose of this work is to find a solution based on a low power wind turbine to serve a real telecommunication site located near Palermo, the main city of Sicily (Italy).

EngineeringWind powerbusiness.industryAir pollutionmedicine.disease_causeTurbinePower (physics)Renewable energyOffshore wind powerElectric power transmissionWork (electrical)medicinebusinessTelecommunicationsThe Open Renewable Energy Journal
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Mini Wind Plant to Power Telecommunication Systems: A Case Study in Sicily

2012

The ever increasing problems related to air pollution and the difficulties for power lines to reach inaccessible areas are pushing to find new solutions for powering telecommunications equipments (TLC). The renewable energy systems, although relatively expensive, have the required characteristics. The purpose of this work is to find a solution based on a low power wind turbine to serve a real telecommunication site located near Palermo, the main city of Sicily (Italy).

EngineeringWind powerbusiness.industryGeneral EngineeringAir pollutionmedicine.disease_causeTurbineCivil engineeringPower (physics)Electric power transmissionWork (electrical)Renewable energy systemmedicinebusinessTelecommunicationsAdvanced Materials Research
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A Novel Method of Distance Measurement Based on Pulse Position Modulation and Synchronization of Chaotic Signals Using Ultrasonic Radar Systems

2009

This paper deals with a novel method of transmission and receipt of a signal based on both the property of two chaotic systems generating the same chaotic signal when they are synchronized and the property of pulse position modulation (PPM) to be insensitive to the distortions of the transmission channel. The method is discussed in the context of ultrasonic radar systems, in which the transmitter and receiver, which consist of ultrasonic sensors, are near each other, and the received signal consists of the transmitted signal reflected by an obstacle. A reference sinusoidal signal is superimposed to a chaotic signal generated by a master chaotic system, and the whole signal is modulated acco…

Engineeringanimal structuresSignal generatorbusiness.industrySignal edgeSignalSignal transitionAnalog signalTransmission (telecommunications)Settore ING-INF/04 - AutomaticaChaotic pulse position modulation (CPPM) chaotic system synchronization crosstalk distance measurement multipath fading ultrasonic sensors.Electronic engineeringDemodulationComputerSystemsOrganization_SPECIAL-PURPOSEANDAPPLICATION-BASEDSYSTEMSElectrical and Electronic EngineeringSignal transfer functionbusinessInstrumentationComputer Science::Information Theory
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Load management for voltage security using probabilistic fuzzy decision tree method

2016

During contingency, load management is most important in planning, monitoring and controlling of power system. In transmission system, there is limit for controlling the reactive power in large size power network. In order to manage heavy loading on transmission, load management is necessary to avoid voltage collapse. This paper presents a methodology for load management considering voltage security assessment using probabilistic fuzzy decision tree (PFDT) technique. By using probabilistic fuzzy decision tree method, the load management is calculated in optimal manner in real time and insecure operating conditions are observed. With the help of this method, a real time load management plan …

Engineeringbusiness.industry020209 energyDecision treeProbabilistic logic02 engineering and technologyTransmission systemAC powerReliability engineeringLoad managementElectric power system0202 electrical engineering electronic engineering information engineeringEntropy (information theory)businessVoltage2016 IEEE International Conference on Information and Automation for Sustainability (ICIAfS)
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Efficient CAD of Optimal Multi-Port Junctions Loaded with Partial-Height Cylindrical Posts using the 3D BI-RME Method

2005

A rigorous full-wave technique based on the 3D BI-RME (Boundary Integral-Resonant Mode Expansion) method for the analysis and design of compensated waveguide junctions is presented. This method is used to investigate the electrical performance of right-angled bends and rectangular waveguide T-junctions loaded with partial-height cylindrical posts, with the aim of extending the typical usable bandwidths of such components. It is found that the electrical performance of a two-way power divider can be significantly improved by considering a post displaced along the symmetry plane of the structure. Therefore, this contribution reveals a new crucial design parameter not considered in previous wo…

Engineeringbusiness.industryAcousticsBandwidth (signal processing)Electronic engineeringPower dividers and directional couplersCADMicrowave transmissionWidebandUSablebusinessWaveguide (optics)Integral equationIEEE MTT-S International Microwave Symposium Digest, 2005.
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