| 1. |
- da Silva, Carlos Natalino, et al.
(författare)
-
Assessing the effects of physical layer attacks on content accessibility and latency in optical CDNs
- 2017
-
Ingår i: 19th International Conference on Transparent Optical Networks (ICTON). - Girona, Spain : IEEE conference proceedings. - 9781538608586
-
Konferensbidrag (refereegranskat)abstract
- Content Delivery Networks (CDNs) are a major enabler of large-scale content distribution for Internet applications. Many of these applications require high bandwidth and low latency for a satisfactory user experience, e.g., cloud gaming, augmented reality, tactile Internet and vehicular communications. Replication is one of the most prominent solutions to meet the requirements of latency-sensitive applications. However, infrastructure disruptions can greatly degrade the performance of such applications, or even cease their proper execution. The extent of degradation can be exacerbated by malicious attackers that target the critical elements of the CDN physical infrastructure to disconnect or severely degrade services.
|
|
| 2. |
- da Silva, Carlos Natalino, et al.
(författare)
-
Content Accessibility in Optical Cloud Networks Under Targeted Link Cuts
- 2017
-
Ingår i: 2017 21st International Conference on Optical Network Design and Modeling, ONDM 2017 - Conference Proceedings. - : Institute of Electrical and Electronics Engineers (IEEE). - 9783901882937
-
Konferensbidrag (refereegranskat)abstract
- One of the key enablers of the digital society is a highly reliable information infrastructure that can ensure resiliency to a wide range of failures and attacks. In cloud networks, replicas of various content are located at geographically distributed data centers, thus inherently enhancing cloud network reliability through diversification and redundancy of user accessibility to the content. However, cloud networks rely on optical network infrastructure which can be a target of deliberate link cuts that may cause service disruption on a massive scale. This paper investigates the dependency between the extent of damage caused by link cuts and a particular replica placement solution, as a fundamental prerequisite of resilient cloud network design that lacks systematic theoretical quantification and understanding. To quantify the vulnerability of optical cloud networks based on anycast communication to targeted link cuts, we propose a new metric called Average Content Accessibility (ACA). Using this metric, we analyze the impact of the number and the placement of content replicas on cloud network resiliency and identify the best and the worst case scenarios for networks of different sizes and connectivity. We evaluate the efficiency of simultaneous and sequential targeted link cuts, the latter reassessing link criticality between subsequent cuts to maximize disruption. Comparison with Average Two-Terminal Reliability (A2TR), an existing robustness measure for unicast networks, shows great discrepancy in the vulnerability results, indicating the need for new measures tailored to anycast-based networks.
|
|
| 3. |
- da Silva, Carlos Natalino, et al.
(författare)
-
Joint Optimization of Failure Management Costs, Electricity Costs, and Operator Revenue in Optical Core Networks
- 2017
-
Ingår i: IEEE Transactions on Green Communications and Networking. - : IEEE Press. - 2473-2400 .- 2473-2400. ; PP:99
-
Tidskriftsartikel (refereegranskat)abstract
- We focus on the problem of maximizing profitability in an optical core network by acting on the power states of Optical Line Amplifiers (OLAs) and Line Cards (LCs) operating under varying traffic. Specifically, the profitability metric considered in this work takes into account the electricity costs of OLAs and LCs, the failure management costs derived from the application of power states to the network devices, and the operator revenue. After proving that all terms of the considered profitability function are deeply inter-correlated, we formulate the optimization problem of maximizing the network profitability in an optical core network with multi-period traffic. By solving the proposed formulation on a realistic scenario, we show that it is possible to wisely trade between the considered costs and revenue, and achieve higher network profitability than in the case in which the single terms are considered in isolation, e.g., only electricity consumption or only Failure Management Costs (FMC).
|
|
| 4. |
- Natalino Da Silva, Carlos, 1987, et al.
(författare)
-
One-shot learning for modulation format identification in evolving optical networks
- 2017
-
Ingår i: Optics InfoBase Conference Papers. - : OSA - The Optical Society. - 9781557528209 ; Part F131-IPRSN 2019
-
Konferensbidrag (refereegranskat)abstract
- We report on the first successful application of one-shot machine learning scheme that identifies new modulation formats based on a single constellation diagram without re-training. 100% accuracy is achieved when expanding from 2 to 5 supported modulation formats. © 2019 The Author(s).
|
|
