نتایج جستجو برای: metro

تعداد نتایج: 4500  

Journal: :Optics express 2009
P Vorreau S Sygletos F Parmigiani D Hillerkuss R Bonk P Petropoulos D J Richardson G Zarris D Simeonidou D Klonidis I Tomkos R Weerasuriya S Ibrahim A D Ellis D Cotter R Morais P Monteiro S Ben Ezra S Tsadka W Freude J Leuthold

We demonstrate a regenerative optical grooming switch for buffer-less interconnection of metro/access and metro/core ring networks with switching functionality in time, space and wavelength domain. Key functionalities of the router are the traffic aggregation with time-slot interchanging (TSI) functionality, the WDM-to-ODTM multiplexing and the OTDM-to-WDM demultiplexing of high-speed channel i...

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2001
Nicholas Madamopoulos Clint Friedman Ioannis Tomkos Aleksandra Boskovic

The transport performance of an optically transparent regional-size ring network testbed with circumference of 280 km, based on metro-area optimized optical layer components and fiber, is demonstrated under dynamic traffic conditions. For the longest transmission path, excellent transmission performance is achieved using cost-effective directly modulated signals. Network reconfigurability is ac...

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2014
Souheir Eido Annie Gravey

In this paper, we propose different offloading scenarios, which help operators controlling the ever increasing of mobile data volumes over the femto and the macro cellular networks. We consider the Selected IP traffic offload (SIPTO) approach in order to selectively offload mobile IP traffic in order to use servers deployed within the metro network “at/above the RAN”. A quantitative study is ca...

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Journal: :Computers & OR 2015
Gilbert Laporte Marta M. B. Pascoal

This paper proposes a practical methodology for the problem of designing a metro configuration under two criteria: population coverage and construction cost. It is assumed that a set of corridors defining a rough a priori geometric configuration is provided by the planners. The proposed algorithm consists of fine tuning the location of single alignments within each corridor. This is achieved by...

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Journal: :Int. Journal of Network Management 2009
Kaiqi Xiong Harry G. Perros Steven Blake

We consider an ADSL access network consisting of subscribers, DSLAMs, metro Ethernet switches and a broadband remote access aggregation server (BRAS). We obtain expressions for dimensioning the access network in the upstream direction. Specifically, we show that the bandwidth required at each DSLAM, metro Ethernet switch, and BRAS can be expressed as an exponential function of the subscribers i...

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Journal: :Acta neurologica Taiwanica 2011
Hung-Yi Hsu

Acta Neurologica Taiwanica Vol 20 No 1 March 2011 From the Section of Neurology, Department of Internal Medicine, Tungs’ Taichung Metro Harbor Hospital, Wuci Township; and the Department of Neurology, School of Medicine, Chung Shan Medical University, Taichung, Taiwan. Accepted March 4, 2011. Correspondence to: Dr. Hung-Yi Hsu, Department of Neurology, Tungs’ Taichung Metro Harbor Hospital, No....

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2008
Xiao Tang Lijun Ma Alan Mink Tiejun Chang Hai Xu Oliver Slattery Anastase Nakassis Barry Hershman David Su Ronald F. Boisvert Ronald E. Meyers Yanhua Shih Keith S. Deacon

Complete high-speed quantum key distribution (QKD) systems over fiber networks for campus and metro areas have been developed at NIST. The systems include an 850-nm QKD system for a campus network, a 1310-nm QKD system for metro networks, and a 3-user QKD network and network manager. In this paper we describe the key techniques used to implement these systems, including polarization recovery, n...

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2014
Ran Harel Nachshon Knoller Gilad Regev Yoram Anekstein Menashe Zaaroor Joseph Leitner Eyal Itshayek Michael P. Steinmetz Thomas E. Mroz Ajit Krishnaney Richard S. Schlenk Gordon R. Bell Iain H. Kalfas Edward C. Benzel Nancy E. Epstein

Spine Surgery Unit, Departments of Neurosurgery, Sheba Medical Center, Tel Hashomer, Israel Affiliated with Sackler Faculty of Medicine, 1Spine Surgery Unit, Tel‐Aviv Sourasky Medical Center, Weitzman 6, 2Spine Surgery Unit, Assaf Harofeh Medical Center, Sackler Faculty of Medicine, Tel‐Aviv University, 3Neurosurgery, Rambam Medical Center and Faculty of Medicine, Technion‐Israel Istitute of Te...

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Journal: :Rural policy brief 2009
Timothy McBride

A range of proposals are now being considered to reform the health care system, specifically to provide access to health insurance coverage for the uninsured. Proposals from President Obama and members of Congress include a range of public-private approaches, typically called “building blocks” approaches, which build upon our current system of health insurance to provide access to health insura...

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2007
Haris N. Koutsopoulos Zhigao Wang

SimMETRO is a microscopic, dynamic, stochastic simulator of urban rail operations (METRO), specifically designed for service performance analysis, and evaluation of operations and strategies for real time control of subway systems. SimMETRO employs a detailed representation of the network, rolling stock, signal control, demand, schedule and dispatching. In particular, the various sources of sto...

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function paginate(evt) { url=/search_year_filter/ var term=document.getElementById("search_meta_data").dataset.term pg=parseInt(evt.target.text) var data={ "year":filter_year, "term":term, "pgn":pg } filtered_res=post_and_fetch(data,url) window.scrollTo(0,0); } function update_search_meta(search_meta) { meta_place=document.getElementById("search_meta_data") term=search_meta.term active_pgn=search_meta.pgn num_res=search_meta.num_res num_pages=search_meta.num_pages year=search_meta.year meta_place.dataset.term=term meta_place.dataset.page=active_pgn meta_place.dataset.num_res=num_res meta_place.dataset.num_pages=num_pages meta_place.dataset.year=year document.getElementById("num_result_place").innerHTML=num_res if (year !== "unfilter"){ document.getElementById("year_filter_label").style="display:inline;" document.getElementById("year_filter_place").innerHTML=year }else { document.getElementById("year_filter_label").style="display:none;" document.getElementById("year_filter_place").innerHTML="" } } function update_pagination() { search_meta_place=document.getElementById('search_meta_data') num_pages=search_meta_place.dataset.num_pages; active_pgn=parseInt(search_meta_place.dataset.page); document.getElementById("pgn-ul").innerHTML=""; pgn_html=""; for (i = 1; i <= num_pages; i++){ if (i===active_pgn){ actv="active" }else {actv=""} pgn_li="
  • " +i+ "
    • "; pgn_html+=pgn_li; } document.getElementById("pgn-ul").innerHTML=pgn_html var pgn_links = document.querySelectorAll('.mypgn'); pgn_links.forEach(function(pgn_link) { pgn_link.addEventListener('click', paginate) }) } function post_and_fetch(data,url) { showLoading() xhr = new XMLHttpRequest(); xhr.open('POST', url, true); xhr.setRequestHeader('Content-Type', 'application/json; charset=UTF-8'); xhr.onreadystatechange = function() { if (xhr.readyState === 4 && xhr.status === 200) { var resp = xhr.responseText; resp_json=JSON.parse(resp) resp_place = document.getElementById("search_result_div") resp_place.innerHTML = resp_json['results'] search_meta = resp_json['meta'] update_search_meta(search_meta) update_pagination() hideLoading() } }; xhr.send(JSON.stringify(data)); } function unfilter() { url=/search_year_filter/ var term=document.getElementById("search_meta_data").dataset.term var data={ "year":"unfilter", "term":term, "pgn":1 } filtered_res=post_and_fetch(data,url) } function deactivate_all_bars(){ var yrchart = document.querySelectorAll('.ct-bar'); yrchart.forEach(function(bar) { bar.dataset.active = false bar.style = "stroke:#71a3c5;" }) } year_chart.on("created", function() { var yrchart = document.querySelectorAll('.ct-bar'); yrchart.forEach(function(check) { check.addEventListener('click', checkIndex); }) }); function checkIndex(event) { var yrchart = document.querySelectorAll('.ct-bar'); var year_bar = event.target if (year_bar.dataset.active == "true") { unfilter_res = unfilter() year_bar.dataset.active = false year_bar.style = "stroke:#1d2b3699;" } else { deactivate_all_bars() year_bar.dataset.active = true year_bar.style = "stroke:#e56f6f;" filter_year = chart_data['labels'][Array.from(yrchart).indexOf(year_bar)] url=/search_year_filter/ var term=document.getElementById("search_meta_data").dataset.term var data={ "year":filter_year, "term":term, "pgn":1 } filtered_res=post_and_fetch(data,url) } } function showLoading() { document.getElementById("loading").style.display = "block"; setTimeout(hideLoading, 10000); // 10 seconds } function hideLoading() { document.getElementById("loading").style.display = "none"; } -->