György Dán | KTH Royal Institute of Technology (original) (raw)

Papers by György Dán

Research paper thumbnail of Distributed Algorithms for Feature Extraction Off-loading in Multi-Camera Visual Sensor Networks

arXiv (Cornell University), May 15, 2017

Research paper thumbnail of Distributed Algorithms for Improving BitTorrent Performance

Research paper thumbnail of An architecture and performance evaluation framework for artificial intelligence solutions in beyond 5G radio access networks

Eurasip Journal on Wireless Communications and Networking, Sep 24, 2022

Research paper thumbnail of Cooperative caching and relaying strategies for peer-to-peer content delivery

International Workshop on Peer-to-Peer Systems, Feb 25, 2008

Research paper thumbnail of NeuroRAN Rethinking Virtualization for AI‐native Radio Access Networks in 6G

INSIGHT

ABSTRACTNetwork softwarization has revolutionized the architecture of cellular wireless networks.... more ABSTRACTNetwork softwarization has revolutionized the architecture of cellular wireless networks. State‐of‐the‐art container based virtual radio access networks (vRAN) provide enormous flexibility and reduced life‐cycle management costs, but they also come with prohibitive energy consumption. We argue that for future AI‐native wireless networks to be flexible and energy efficient, there is a need for a new abstraction in network softwarization that caters for neural network type of workloads and allows a large degree of service composability. In this paper we present the NeuroRAN architecture, which leverages stateful function as a user facing execution model, and is complemented with virtualized resources and decentralized resource management. We show that neural network based implementations of common transceiver functional blocks fit the proposed architecture, and we discuss key research challenges related to compilation and code generation, resource management, reliability and s...

Research paper thumbnail of A continuum of undetectable timing-attacks on PMU-based linear state-estimation

2017 IEEE International Conference on Smart Grid Communications (SmartGridComm)

Research paper thumbnail of Decentralized Convex Optimization for Joint Task Offloading and Resource Allocation of Vehicular Edge Computing Systems

IEEE Transactions on Vehicular Technology

Research paper thumbnail of Correlation-based Detection of PMU Time Synchronization Attacks

2018 IEEE International Conference on Communications, Control, and Computing Technologies for Smart Grids (SmartGridComm), 2018

Research paper thumbnail of Stochastic Dynamic Cache Partitioning for Encrypted Content Delivery

2016 28th International Teletraffic Congress (ITC 28), 2016

Research paper thumbnail of A Scalable Formulation for Look-Ahead Security-Constrained Optimal Power Flow

IEEE Transactions on Control of Network Systems, 2022

Research paper thumbnail of Dynamic Cheap Talk for Robust Adversarial Learning

Lecture Notes in Computer Science, 2019

Research paper thumbnail of Caching Policies over Unreliable Channels

Recently, there has been substantial progress in the formal understanding of how caching resource... more Recently, there has been substantial progress in the formal understanding of how caching resources should be allocated when multiple caches each deploy the common LRU policy. Nonetheless, the role played by caching policies beyond LRU in a networked setting where content may be replicated across multiple caches and where channels are unreliable is still poorly understood. In this paper, we investigate this issue by first analyzing the cache miss rate in a system with two caches of unit size each, for the LRU, and the LFU caching policies, and their combination. Our analytical results show that joint use of the two policies outperforms LRU, while LFU outperforms all these policies whenever resource pooling is not optimal. We provide empirical results with larger caches to show that simple alternative policies, such as LFU, provide superior performance compared to LRU even if the space allocation is not fine tuned. We envision that fine tuning the cache space used by such policies may...

Research paper thumbnail of Joint Resource Dimensioning and Placement for Dependable Virtualized Services in Mobile Edge Clouds

IEEE Transactions on Mobile Computing, 2021

Research paper thumbnail of Network-aware Mitigation of Undetectable PMU Time Synchronization Attacks

2020 IEEE International Conference on Communications, Control, and Computing Technologies for Smart Grids (SmartGridComm), 2020

Research paper thumbnail of Model-Based and Data-Driven Detectors for Time Synchronization Attacks Against PMUs

IEEE Journal on Selected Areas in Communications, 2019

Research paper thumbnail of Feasibility of Time-Synchronization Attacks Against PMU-Based State Estimation

IEEE Transactions on Instrumentation and Measurement, 2019

Research paper thumbnail of A Game Theoretic Approach to Setting the Pilot Power Ratio in Multi-User MIMO Systems

IEEE Transactions on Communications, 2018

Research paper thumbnail of Traffic Control for VBR Video in Packet Switched Networks

The best effort service offered by the Internet is notsatisfactory for the transmission of loss a... more The best effort service offered by the Internet is notsatisfactory for the transmission of loss and delay sensitivedata, such as real-time voice and video. In order to provideservice guarantees at ...

Research paper thumbnail of Internet Video Transmission

The Internet has rapidly evolved from being a scientific experiment to a commercial network conne... more The Internet has rapidly evolved from being a scientific experiment to a commercial network connecting millions of hosts that carries traffic generated by a large amount of applications with divers ...

Research paper thumbnail of Modeling loss and delay in multi-tree-based overlay multicast

In this paper we propose an analytical model to evaluate the end-to-end loss and delay characteri... more In this paper we propose an analytical model to evaluate the end-to-end loss and delay characteris-tics for live multicast streaming. We consider multiple-tree architectures and push based transmission. We give an asymptotic bound on the performance of large overlays, and present a necessary condition for the overlay to be stable. Based on the model we show how the overlay's loss characteristics is influenced by the number of distribution trees, the error control solutions used, the allocation of the bandwidth resources of the peers between the trees and the number of nodes in the overlay. Based on our results, we propose a tree structure that improves the stability of the overlay. We use the model to show how the structure of the overlay and the available bandwidth influence the delay characteristics of the data distribution and the playout buffer requirements.

Research paper thumbnail of Distributed Algorithms for Feature Extraction Off-loading in Multi-Camera Visual Sensor Networks

arXiv (Cornell University), May 15, 2017

Research paper thumbnail of Distributed Algorithms for Improving BitTorrent Performance

Research paper thumbnail of An architecture and performance evaluation framework for artificial intelligence solutions in beyond 5G radio access networks

Eurasip Journal on Wireless Communications and Networking, Sep 24, 2022

Research paper thumbnail of Cooperative caching and relaying strategies for peer-to-peer content delivery

International Workshop on Peer-to-Peer Systems, Feb 25, 2008

Research paper thumbnail of NeuroRAN Rethinking Virtualization for AI‐native Radio Access Networks in 6G

INSIGHT

ABSTRACTNetwork softwarization has revolutionized the architecture of cellular wireless networks.... more ABSTRACTNetwork softwarization has revolutionized the architecture of cellular wireless networks. State‐of‐the‐art container based virtual radio access networks (vRAN) provide enormous flexibility and reduced life‐cycle management costs, but they also come with prohibitive energy consumption. We argue that for future AI‐native wireless networks to be flexible and energy efficient, there is a need for a new abstraction in network softwarization that caters for neural network type of workloads and allows a large degree of service composability. In this paper we present the NeuroRAN architecture, which leverages stateful function as a user facing execution model, and is complemented with virtualized resources and decentralized resource management. We show that neural network based implementations of common transceiver functional blocks fit the proposed architecture, and we discuss key research challenges related to compilation and code generation, resource management, reliability and s...

Research paper thumbnail of A continuum of undetectable timing-attacks on PMU-based linear state-estimation

2017 IEEE International Conference on Smart Grid Communications (SmartGridComm)

Research paper thumbnail of Decentralized Convex Optimization for Joint Task Offloading and Resource Allocation of Vehicular Edge Computing Systems

IEEE Transactions on Vehicular Technology

Research paper thumbnail of Correlation-based Detection of PMU Time Synchronization Attacks

2018 IEEE International Conference on Communications, Control, and Computing Technologies for Smart Grids (SmartGridComm), 2018

Research paper thumbnail of Stochastic Dynamic Cache Partitioning for Encrypted Content Delivery

2016 28th International Teletraffic Congress (ITC 28), 2016

Research paper thumbnail of A Scalable Formulation for Look-Ahead Security-Constrained Optimal Power Flow

IEEE Transactions on Control of Network Systems, 2022

Research paper thumbnail of Dynamic Cheap Talk for Robust Adversarial Learning

Lecture Notes in Computer Science, 2019

Research paper thumbnail of Caching Policies over Unreliable Channels

Recently, there has been substantial progress in the formal understanding of how caching resource... more Recently, there has been substantial progress in the formal understanding of how caching resources should be allocated when multiple caches each deploy the common LRU policy. Nonetheless, the role played by caching policies beyond LRU in a networked setting where content may be replicated across multiple caches and where channels are unreliable is still poorly understood. In this paper, we investigate this issue by first analyzing the cache miss rate in a system with two caches of unit size each, for the LRU, and the LFU caching policies, and their combination. Our analytical results show that joint use of the two policies outperforms LRU, while LFU outperforms all these policies whenever resource pooling is not optimal. We provide empirical results with larger caches to show that simple alternative policies, such as LFU, provide superior performance compared to LRU even if the space allocation is not fine tuned. We envision that fine tuning the cache space used by such policies may...

Research paper thumbnail of Joint Resource Dimensioning and Placement for Dependable Virtualized Services in Mobile Edge Clouds

IEEE Transactions on Mobile Computing, 2021

Research paper thumbnail of Network-aware Mitigation of Undetectable PMU Time Synchronization Attacks

2020 IEEE International Conference on Communications, Control, and Computing Technologies for Smart Grids (SmartGridComm), 2020

Research paper thumbnail of Model-Based and Data-Driven Detectors for Time Synchronization Attacks Against PMUs

IEEE Journal on Selected Areas in Communications, 2019

Research paper thumbnail of Feasibility of Time-Synchronization Attacks Against PMU-Based State Estimation

IEEE Transactions on Instrumentation and Measurement, 2019

Research paper thumbnail of A Game Theoretic Approach to Setting the Pilot Power Ratio in Multi-User MIMO Systems

IEEE Transactions on Communications, 2018

Research paper thumbnail of Traffic Control for VBR Video in Packet Switched Networks

The best effort service offered by the Internet is notsatisfactory for the transmission of loss a... more The best effort service offered by the Internet is notsatisfactory for the transmission of loss and delay sensitivedata, such as real-time voice and video. In order to provideservice guarantees at ...

Research paper thumbnail of Internet Video Transmission

The Internet has rapidly evolved from being a scientific experiment to a commercial network conne... more The Internet has rapidly evolved from being a scientific experiment to a commercial network connecting millions of hosts that carries traffic generated by a large amount of applications with divers ...

Research paper thumbnail of Modeling loss and delay in multi-tree-based overlay multicast

In this paper we propose an analytical model to evaluate the end-to-end loss and delay characteri... more In this paper we propose an analytical model to evaluate the end-to-end loss and delay characteris-tics for live multicast streaming. We consider multiple-tree architectures and push based transmission. We give an asymptotic bound on the performance of large overlays, and present a necessary condition for the overlay to be stable. Based on the model we show how the overlay's loss characteristics is influenced by the number of distribution trees, the error control solutions used, the allocation of the bandwidth resources of the peers between the trees and the number of nodes in the overlay. Based on our results, we propose a tree structure that improves the stability of the overlay. We use the model to show how the structure of the overlay and the available bandwidth influence the delay characteristics of the data distribution and the playout buffer requirements.