Τη Δευτέρα 18/12 θα μας μιλήσει ο Στρατής Ιωαννίδης (Northeastern University). Η ομιλία θα γινει στις 5:15μμ στην αίθουσα 1.1.31 (Παλ. Κτ. Ηλεκτρολόγων). Η ομιλία είναι ανοιχτή σε κάθε ενδιαφερόμενο. Λεπτομέρειες ακολουθούν.

Title: Adaptive Caching Networks with Optimality Guarantees

Abstract: Optimally placing content over a network of arises in many networking applications. Given the content demand, described by content requests and paths they follow, we wish to determine the content placement that maximizes the expected caching gain, i.e., the reduction of routing costs due to intermediate caching. The offline version of this problem is NP-hard. To make matters worse, in most cases, both the demand and the network topology may be a priori unknown; hence, distributed, adaptive content placement algorithms that yield constant approximation guarantees are desired. We show that path replication, an algorithm encountered often in both networking literature and in practice, can be arbitrarily suboptimal when combined with traditional cache eviction policies, like LRU, LFU, or FIFO. We propose a distributed, adaptive algorithm that provably constructs a probabilistic content placement within 1−1/e factor from the optimal, in expectation. Finally, we extend these results to optimizing caching and routing decisions jointly.

Bio:Stratis Ioannidis is an assistant professor in the Electrical and Computer Engineering Department of Northeastern University, in Boston, MA, where he also holds a courtesy appointment with the College of Computer and Information Science. He received his B.Sc. (2002) in Electrical and Computer Engineering from the National Technical University of Athens, Greece, and his M.Sc. (2004) and Ph.D. (2009) in Computer Science from the University of Toronto, Canada. Prior to joining Northeastern, he was a research scientist at the Technicolor research centers in Paris, France, and Palo Alto, CA, as well as at Yahoo Labs in Sunnyvale, CA. He is the recipient of a Google Faculty Research Award and a best paper award at ICN 2017.

(Edited by Αντώνης Αντωνόπουλος - original submission Monday, 18 December 2017, 12:01 PM)