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Wyniki wyszukiwania dla: DISASTER-RESILIENT ROUTING

Wyniki wyszukiwania dla: DISASTER-RESILIENT ROUTING

  • Disaster-Resilient Routing Schemes for Regional Failures

    Publikacja
    • T. Gomes
    • D. Santos
    • R. Girão-Silva
    • L. Martins
    • B. Nedic
    • M. Gunkel
    • B. Vass
    • J. Tapolcai
    • J. Rak

    - Rok 2020

    Large-scale natural disasters can have a profound effect on the telecommunication services in the affected geographical area. Hence, it is important to develop routing approaches that may help in circumventing damaged regional areas of a network. This prompted the development of geographically diverse routing schemes and also of disaster-risk aware routing schemes. A minimum-cost geodiverse routing, where a minimum geographical...

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  • Taxonomy of Schemes for Resilient Routing

    Publikacja

    - Rok 2020

    This chapter provides a taxonomy of schemes for resilient routing followed by a discussion of their application to contemporary architectures of communication networks. In particular, a general classification of schemes for resilient routing is first presented followed by a description of the reference schemes for IP networks. The chapter in its later part focuses on the representative techniques of resilient routing for a multi-domain...

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  • Resilient Routing in Communication Networks

    Publikacja

    - Rok 2015

    This important text/reference addresses the latest issues in end-to-end resilient routing in communication networks. The work highlights the main causes of failures of network nodes and links, and presents an overview of resilient routing mechanisms, covering issues related to the Future Internet (FI), wireless mesh networks (WMNs), and vehicular ad-hoc networks (VANETs). For each of these network architectures, a selection of...

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  • Disaster-resilient communication networks: Principles and best practices

    Publikacja
    • A. Mauthe
    • D. Hutchison
    • E. Cetinkaya
    • I. Ganchev
    • J. Rak
    • J. P. Sterbenz
    • M. Gunkelk
    • P. Smith
    • T. Gomes

    - Rok 2016

    Communication network failures that are caused by disasters, such as hurricanes, arthquakes and cyber-attacks, can have significant economic and societal impact. To address this problem, the research community has been investigating approaches to network resilience for several years. However, aside from well-established techniques, many of these solutions have not found their way into operational...

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  • Survivability function - a measure of disaster-based routing performance.

    Publikacja

    - Rok 2004

    Znaczenie przeżywalności sieci transmisji danych systematycznie rośnie, ponieważ awaria pojedynczego elementu może dotknąć miliony użytkowników na dużym obszarze. Zdefiniowano funkcję przeżywalności: prawdopodobieństwo realizacji określonego procentu strumieni użytkowników po awarii oraz atrybuty przeżywalności. Celem pracy było zbadanie wpływu protokołów doboru tras architektury TC/IP na funkcję i atrybuty przeżywalności. Pracę...

  • Toward Fast Calculation of Communication Paths for Resilient Routing

    Publikacja

    - NETWORKS - Rok 2017

    Utilization of alternate communication paths is a common technique to provide protection of transmission against failures of network nodes/links. However, a noticeable delay is encountered when calculating the relevant sets of disjoint paths using the available algorithms (e.g., using Bhandari’s approach). This, in turn, may have a serious impact on the ability of a network to serve dynamic demands...

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  • Network Graph Transformation Providing Fast Calculation of Paths for Resilient Routing

    Publikacja

    Protection of transmission against failures can be appropriately dealt with by alternative paths. However, common schemes (e.g., Bhandaris scheme) are characterized by a remarkable delay while determining the transmission paths. This in turn may have a serious impact on serving dynamic demands (characterized by relatively short duration time). As a remedy to this problem, we introduce an approach to pre-compute the sets of disjoint...

  • RECODIS: Resilient Communication Services Protecting End-user Applications from Disaster-based Failures

    Publikacja
    • J. Rak
    • D. Hutchison
    • E. Calle
    • T. Gomes
    • M. Gunkel
    • P. Smith
    • J. Tapolcai
    • S. Verbrugge
    • L. Wosinska

    - Rok 2016

    Disaster-based failures can seriously disrupt any communication network, making its services unavailable. Such disruptions may be caused by natural disasters, technology-related failures, or malicious attacks, and they are observably increasing in number, intensity and scale. When network services that are a part of critical infrastructure become unavailable, commercial and/or societal problems are inevitable. The issue of limiting...

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  • eFRADIR: An Enhanced FRAmework for DIsaster Resilience

    Publikacja
    • A. Pasic
    • R. Girao-Silva
    • F. Mogyorosi
    • B. Vass
    • T. Gomes
    • P. Babarczi
    • P. Revisnyei
    • J. Tapolcai
    • J. Rak

    - IEEE Access - Rok 2021

    This paper focuses on how to increase the availability of a backbone network with minimal cost. In particular, the new framework focuses on resilience against natural disasters and is an evolution of the FRADIR/FRADIR-II framework. It targets three different directions, namely: network planning, failure modeling, and survivable routing. The steady state network planning is tackled by upgrading a sub-network (a set of links termed...

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  • Reinforced Secure Gossiping Against DoS Attacks in Post-Disaster Scenarios

    Publikacja

    - IEEE Access - Rok 2020

    During and after a disaster, the perceived quality of communication networks often becomes remarkably degraded with an increased ratio of packet losses due to physical damages of the networking equipment, disturbance to the radio frequency signals, continuous reconfiguration of the routing tables, or sudden spikes of the network traffic, e.g., caused by the increased user activity in a post-disaster period. Several techniques have...

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  • Enhancing Availability for Critical Services

    Publikacja
    • T. Gomes
    • L. Martins
    • R. Girão-Silva
    • D. Tipper
    • A. Pašić
    • B. Vass
    • L. Garrote
    • U. J. Nunes
    • M. Zachariasen
    • J. Rak

    - Rok 2020

    Traditional approaches to provide classes of resilient service take the physical network availability as an input and then deploy redundancy and restoration techniques at various layers, often without full knowledge of mappings between layers. This makes it hard (and often inefficient) to ensure the high availability required by critical services which are typically a small fraction of the total traffic. Here, the innovative technique...

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  • A repeated game formulation of network embedded coding for multicast resilience in extreme conditions

    Publikacja
    • C. Esposito
    • A. Castiglione
    • F. Palmieri
    • F. Pop
    • J. Rak

    - Rok 2017

    Computer networks and data sharing applications are vital for our current society and fundamental for any available ICT solution, so that networking is considered as one of the key critical infrastructures and its correct behavior should be always enforced, even in case of disasters or severe execution conditions. Resilience is a strongly demanding nonfunctional requirement for current computer networks, and one of the key factors...

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  • Fundamentals of Communication Networks Resilience to Disasters and Massive Disruptions

    Publikacja
    • J. Rak
    • D. Hutchison
    • J. Tapolcai
    • R. Bruzgiene
    • M. Tornatore
    • C. Mas-Machuca
    • M. Furdek
    • P. Smith

    - Rok 2020

    Communication networks are exposed to a variety of massive failure events following from activities of nature, weather-induced disruptions, technology-implied problems, and malicious human activities. In this chapter, we first highlight the characteristics of these scenarios and discuss example failure events reported during the last three decades. Next, we explain the concept of network resilience and present an overview of major...

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  • A taxonomy of challenges to resilient message dissemination in VANETs

    Publikacja

    - Rok 2016

    Inter-vehicular communications is seen as a promising solution to a number of issues related with public road safety, road congestion management, and infotainment. However, Vehicular Ad-hoc NETworks (VANETs) characterized by high mobility of vehicles and facing a number of other issues related with high frequency wireless communications and network disconnections, encounter major challenges related with reliability of message delivery....

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  • RNDM 2016 Workshop and 2nd Meeting of COST CA15127-RECODIS: Highlights from the Resilience Week in Halmstad, Sweden

    Publikacja
    • M. Jonsson
    • J. Rak
    • D. Papadimitriou
    • A. Somani

    - IEEE COMMUNICATIONS MAGAZINE - Rok 2017

    Leading network resilience researchers took part in the Resilience Week on Sept. 12-15, 2016 at Halmstad University, SE by Prof. Magnus Jonsson from the Centre for Research on Embedded Systems (CERES), Halmstad University, SE, and Prof. Jacek Rak from Gdansk University of Technology, PL. It included two major events: - The 2nd Meeting of COST CA15127–RECODIS Action (Resilient Communication Services Protecting End-user Applications...

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  • An approach to improve the time efficiency of disjoint paths calculation

    Publikacja

    - Rok 2015

    Failures of network elements can be appropriately dealt with by utilization of alternate disjoint paths to provide redirection of flows affected by failures of the respective working paths. Known approaches can be broadly divided by decision on backup paths installation into proactive and reactive mechanisms, as well as based on the scope of recovery actions into local and global rerouting. There are several important scenarios...

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  • Evaluation of time-efficiency of disjoint paths calculation schemes

    Publikacja

    - Rok 2015

    The concept of alternate paths has been shown in the literature to provide fast response of a network to failures of its elements (nodes/links) affecting flows along the primary communication paths. Various approaches have been proposed to reduce the time necessary to redirect the respective flows onto the alternate paths. In this paper, we focus on another important objective, that so far has not received much attention, i.e.,...

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  • Fundamental Schemes to Determine Disjoint Paths for Multiple Failure Scenarios

    Publikacja
    • T. Gomes
    • L. Jorge
    • R. Girão-Silva
    • J. Yallouz
    • P. Babarczi
    • J. Rak

    - Rok 2020

    Disjoint path routing approaches can be used to cope with multiple failure scenarios. This can be achieved using a set of k (k> 2) link- (or node-) disjoint path pairs (in single-cost and multi-cost networks). Alternatively, if Shared Risk Link Groups (SRLGs) information is available, the calculation of an SRLG-disjoint path pair (or of a set of such paths) can protect a connection against the joint failure of the set of links...

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  • PLANNING AND ANALYSIS OF EARTHQUAKE DISASTER RELIEF WORK IN ETHIOPIA

    Publikacja

    - Rok 2019

    This paper addresses dynamic planning and analysis of earthquake disaster relief work by analysis the disaster throughout the technical and procedural method. And combine this analysis as continues assessment for better input to investigating planning disaster for discontinuous economic growth. This implemented, considering the vulnerability and hazard analysis as a procedural analysis disaster to estimating acceptance risk leveling...

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  • Disaster Resilience of Optical Networks: State of the Art, Challenges, and Opportunities

    Publikacja
    • J. Rak
    • R. Girão-Silva
    • T. Gomes
    • G. Ellinas
    • B. Kantarci
    • M. Tornatore

    - Optical Switching and Networking - Rok 2021

    For several decades, optical networks, due to their high capacity and long-distance transmission range, have been used as the major communication technology to serve network traffic, especially in the core and metro segments of communication networks. Unfortunately, our society has often experienced how the correct functioning of these critical infrastructures can be substantially hindered by massive failures triggered by natural...

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  • Scheduling jobs to contain a natural disaster: a model and complexity

    this paper is devoted to the problem of scheduling suppression units so that a natural disaster is dealt with as efficient as possible. the concept of deteriorating jobs is adopted, that is, the formal model of scheduling represents linearly increasing value loss as the disaster remains unsuppressed and increasing time for its suppression. more precisely, two different goals are considered: finding a suppression schedule of minimal...

  • Transport of dangerous goods by rail, and threats to the subsoil of the railway surface in the event of a disaster

    In Poland, in 2020, the mass of dangerous goods (loads) transported by rail was 26 151.06 thousand tone. This translated into the performance of 8 899 691.89 thousand tone - km of transport performance. In 2020, these figures accounted for 11.72% of the weight of goods transported by rail. The situation is similar in other countries around the world. With such a large volume of transport of dangerous...

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  • Routing equal-size messages on a slotted ring

    Publikacja

    - JOURNAL OF SCHEDULING - Rok 2012

    Analizujemy problem routingu wiadomości w sieci slotted ring, biorąc pod uwagę dwa kryteria optymalizacyjne: długość uszeregowania oraz liczbę 'cykli' pracy sieci. Optymalny routing dla wiadomości o rozmiarze k jest silnie NP-trudny, natomiast dla k=q, gdzie q jest rozmiarem sieci, można obliczyć w czsie O(n^2log n) dla pierwszego kryterium. Podajemy również algorytm o czasie działania O(nlog n) oraz o stałym współczynniku dobroci....

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  • Traffic Type Influence on Performance of OSPF QoS Routing

    Publikacja

    - Rok 2012

    Feasibility studies with QoS routing proved that the network traffic type has influence on routing performance. In this work influence of self-similar traffic for network with DiffServ architecture and OSPF QoS routing has been verified. Analysis has been done for three traffic classes. Multiplexed ON-OFF model was used for self-similar traffic generation. Comparison of simulation results were presented using both relative and...

  • Multi-objective Weather Routing with Customised Criteria and Constraints

    Publikacja

    The paper presents a weather routing algorithm utilising a multi-objective optimisation with constraints, namely the Multi-objective Evolutionary Weather Routing Algorithm (MEWRA). In the proposed approach weather route recommendations can be made simultaneously e.g. for passage time, fuel consumption and safety of passage by means of Pareto optimisation. The sets of criteria and constraints in the optimisation process are fully...

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  • Sustainable and Resilient Infrastructure

    Czasopisma

    ISSN: 2378-9689 , eISSN: 2378-9697

  • Multicriteria Evolutionary Weather Routing Algorithm in Practice

    The Multicriteria Evolutionary Weather Routing Algorithm (MEWRA) has already been introduced by the author on earlier TransNav 2009 and 2011 conferences with a focus on theoretical application to a hybrid-propulsion or motor-driven ship. This paper addresses the topic of possible practical weather routing applications of MEWRA. In the paper some practical advantages of utilizing Pareto front as a result of multicriteria optimization...

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  • Simulation model for evaluation of QOS dynamic routing

    Publikacja

    - Rok 2009

    Current informational networks use a large variety of technologies to support data exchange. Most of them are focused on IP protocol and include mechanisms which by definition should supply demanded QoS. One of those mechanisms is efficient path calculation - routing. Traffic offered to the network can change very rapidly in short term. Routing should support such traffic changes and all the time calculate valid paths in terms...

  • Traffic Type Influence on Performance of OSPF QoS Routing

    Feasibility studies with QoS routing proved that the network traffic type has influence on routing performance. In this work influence of self-similar traffic for network with DiffServ architecture and OSPF QoS routing has been verified. Analysis has been done for three traffic classes. Multiplexed On-Off model was used for self-similar traffic generation. Comparison of simulation results was presented using both relative and non-relative...

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  • Clonal selection algorithm for vehicle routing

    Publikacja

    - Rok 2008

    Over the years several successful computing techniques have been inspired by biological mechanisms. Studies of the mechanisms that allow the immune systems of vertebratesto adapt and learn have resulted in a class of algorithms called artificial immune systems. Clonal selection is a process that allows lymphocytes to launch a quick response to known pathogens and to adapt to new, previously unencountered ones. This paper presents...

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  • Multi-objective weather routing of sailing vessels

    The paper presents a multi-objective deterministic method of weather routing for sailing vessels. Depending on a particular purpose of sailboat weather routing, the presented method makes it possible to customize the criteria and constraints so as to fit a particular user’s needs. Apart from a typical shortest time criterion, safety and comfort can also be taken into account. Additionally, the method supports dynamic weather data:...

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  • Towards Improving Optimised Ship Weather Routing

    Publikacja

    - Polish Maritime Research - Rok 2020

    The aim of the paper is to outline a project focusing on the development of a new type of ship weather routing solution with improved uncertainty handling, through better estimation of ship performance and responses to sea conditions. Ensemble forecasting is considered to take into account the uncertainty levels that are typical of operations in a stochastic environment. Increased accuracy of weather prediction is achieved through...

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  • REVIEW OF WEATHER FORECAST SERVICES FOR SHIP ROUTING PURPOSES

    Weather data is nowadays used in a variety of navigational and ocean engineering research problems: from the obvious ones like voyage planning and routing of sea-going vessels, through the analysis of stability-related phenomena, to detailed modelling of ships’ manoeuvrability for collision avoidance purposes. Apart from that, weather forecasts are essential for passenger cruises and fishing vessels that want to avoid the risk...

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  • Dynamic unattended measurement based routing algorithm for diffServ architecture

    Publikacja

    - Rok 2010

    Dynamic routing is very important in terms of assuring QoS in today's packet networks especially for streaming and elastic services. Existing solutions dedicated to dynamic routing are often too complicated and seem to be not usable in real time traffic scenarios where transferred traffic may vary significantly. This was the main reason for research and new routing mechanism proposal which should apply to today's packet networks....

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  • Hybrid DUMBRA: an efficient QoS routing algorithm for networks with DiffServ architecture

    Publikacja

    - Rok 2011

    Dynamic routing is very important issue of current packet networks. It may support the QoS and help utilize available network resources. Unfortunately current routing mechanisms are not sufficient to fully support QoS. Although many research has been done in this area no generic QoS routing algorithm has been proposed that could be used across all network structures. Existing QoS routing algorithms are either dedicated to limited...

  • Collision Risk-Informed Weather Routing for Sailboats

    Selected COLREG rules, good seamanship and sheer common sense indicate that it is in a sailboat's interest to follow collision-free routes without relying on large power-driven ships to give way. Until now, however, no method has integrated a sailboat's weather routing with collision risk monitoring and collision avoidance. Therefore, a new deterministic approach to combine the above features within one method is introduced here....

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  • Routing decisions independent of queuing delays in broadband leo networks

    Publikacja

    - Rok 2009

    This paper presents an analysis of queuing and propagation delays of Inter-Satellite Links (ISLs) in broadband Low-Earth Orbit (LEO) satellite networks. It is shown that queuing delays are negligible in all reasonable working conditions of the broadband ISL network. This fact makes it possible to simplify the routing protocols in such networks and permits using already known multi-commodity flow solutions for routing. The performance...

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  • METHOD OF ROUTING SHIPS SAILING IN DEDICATED ENVIRONMENT

    Publikacja

    The method for determining the suboptimal route of sailing vessels operating in a restricted area of the sea are proposed in the paper. The dynamics of the environment including weather conditions and speed characteristics of ships sailing are considered. As optimiza-tion criterion, measure sailing time T, and the number of maneuvers performed ω, are taken into account. An heuristic algorithm, and the appropriate application routing...

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  • Simulation model for evaluation of QoS routing algorithm in large packet networks

    The variety of traffic transferred via current telecommunication networks includes also voice, which should meet quality requirements. One of mechanisms, which can support QoS in current packet networks, is routing. There exist many routing proposals which should introduce the QoS into the network but practically they don't. Following paper presents the realization of simulation model for evaluation of a new routing algorithm DUMBRA...

  • Inverse Flood Routing Using Simplified Flow Equations

    Publikacja

    - WATER RESOURCES MANAGEMENT - Rok 2022

    The paper considers the problem of inverse flood routing in reservoir operation strategy. The aim of the work is to investigate the possibility of determining the hydrograph at the upstream end based on the hydrograph required at the downstream end using simplified open channel flow models. To accomplish this, the linear kinematic wave equation, the diffusive wave equation and the linear Muskingum equation are considered. To achieve...

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  • All-gather Algorithms Resilient to Imbalanced Process Arrival Patterns

    Two novel algorithms for the all-gather operation resilient to imbalanced process arrival patterns (PATs) are presented. The first one, Background Disseminated Ring (BDR), is based on the regular parallel ring algorithm often supplied in MPI implementations and exploits an auxiliary background thread for early data exchange from faster processes to accelerate the performed all-gather operation. The other algorithm, Background Sorted...

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  • Improving Clairvoyant: reduction algorithm resilient to imbalanced process arrival patterns

    The Clairvoyant algorithm proposed in “A novel MPI reduction algorithm resilient to imbalances in process arrival times” was analyzed, commented and improved. The comments concern handling certain edge cases in the original pseudocode and description, i.e., adding another state of a process, improved cache friendliness more precise complexity estimations and some other issues improving the robustness of the algorithm implementation....

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  • ADOPTED ISOCHRONE METHOD IMPROVING SHIP SAFETY IN WEATHER ROUTING WITH EVOLUTIONARY APPROACH

    The paper is focused on adaptation of an isochrone method necessary for application to a weather routing system with evolutionary approach. Authors propose an adaptation of the isochrone method with area partitioning assuring that the route found by the adopted method would not cross land. In result, when applied to a weather routing system with evolutionary approach, this proposal facilitates creation of initial population, resulting...

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  • Complexity of resilient network optimisation

    Publikacja

    - European Transactions on Telecommunications - Rok 2009

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  • On the complexity of resilient network design

    Publikacja

    - NETWORKS - Rok 2010

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  • Influence of Self-Similar Traffic Type on Performance of QoS Routing Algorithms

    Providing a Quality of Services (QoS) into current telecommunication networks based on packet technology is a big challenge nowadays. Network operators have to support a number of new services like voice or video which generate new type of traffic. This traffic serviced with QoS in consequence requires access to appropriate network resources. Additionally, new traffic type is mixed with older one, like best-effort. Analysis of...

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  • Smart and resilient cities- new challanges for Polish cities in terms of 2020 energy efficiency and climate action

    Publikacja

    - Rok 2018

    Global climate change action along with energy efficiency optimizations are becoming increasingly pressing principles in terms of moving towards sustainable development. As a member of EU and UN Poland is also obliged to follow restricted rules concerning energy efficiency of buildings which come to force in 2020. To meet new goals, innovative approaches - like moving towards smart and resilient cities -may be required. Through...

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  • The resilient city in architectural engineering education: a joint design studio between Gdańsk and Chalmers universities of technology

    Challenges to society, such as those posed by climate change require a new approach to the education of the engineer-architect. Contemporary solutions should serve future generations and that is why the idea of the resilient city should be discussed and implemented, both in theory and in practice. It is necessary to teach students to design urban structures in such a way that they are resilient to dynamically changing conditions....

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  • Methods for physical impairment constrained routing with selected protection in all-optical networks

    Publikacja
    • P. Soproni
    • T. Cinkler
    • J. Rak

    - TELECOMMUNICATION SYSTEMS - Rok 2014

    In this paper, we investigate the problem of survivable all-optical routing in WDM networks with physical impairments. One of the recent key issues in survivable optical network design refers to maximization of the ratio of routeable demands while keeping the overall network cost low. In WDM networks, this goal can be achieved by routing as many demands in all-optical way as possible. Based on the latest technical trends driven...

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  • Disaster Advances

    Czasopisma

    ISSN: 0974-262X