I am fourth year Ph.D. candidate at Columbia University in the city of New York. I am a member of the Software Systems Laboratory and my advisors are Roxana Geambasu (primary advisor) and Jason Nieh (secondary advisor). I also work with Daniel Hsu from Columbia' s Data Science Institute and with Suman Jana from the Network Security Lab.
Before joining to Columbia I was a member of the European Organization for Nuclear Research (CERN), IT Department. I contributed to Agile Infrastructure, which provides Infrastructure as a Service (IaaS) for CERN's private, OpenStack-based cloud. For more details, some distinguished former colleagues made these interesting presentations: Configuration Management and CERN's OpenStack Cloud.
My alma mater is the National and Kapodistrian University of Athens (UOA), Department of Informatics and Telecommunications. I worked there with Alex Delis from Management of Data, Information & Knowledge group and with Mema Roussopoulos from the Distributed Systems Lab.
My research interests are in computer systems, including operating systems (OSes), distributed systems, and machine learning (ML) systems. Current, I focus on addressing challenges inherent in the development of modern mobile, cloud, and ML applications. These applications are fundamentally different from traditional desktop applications and require renewed support from operating systems as well as new development environments. I have been running measurement studies to identify missing or mismatched abstractions for modern applications, and invent new programming abstractions and systems to support the needs of modern applications. Following are some projects in this space.
Security of Machine Learning Systems under Adversarial SettingsState of the art machine learning systems, such as those using deep neural networks for classification and regression, have recently achieved unprecedented success in a variety of tasks ranging from image and speech recognition to data compression. Recent work however has made an intriguing discovery: these systems are extremely susceptible to adversarial attacks. That is, an adversary can modify correctly classified samples by adding an infinitestament amount of carefully crafed noise that will force the model to misclassify (with high confidence) samples only marginaly different from the original ones. In lieu of these vulnerabilities, I am currently working on defences to harden machine learning systems and increase their robustness against adversarial attacks. My long-term goal is to contribute solutions that will shed light into arcane ML models and will arm developers with powerful debugging primitives to help identify and address subtle security, performance, and reliability challenges.
Before joining Columbia, I worked on several projects related to distributed, peer-to-peer systems, such as BitTorrent. In one of our projects, we enhanced the BitTorrent protocol with an optimistic unchocking policy that improves the quality of inter-connections amongst peers and increases the number of peers that are both directly connected and interested in cooperation. Our evaluation showed that the approach significantly outperforms BitTorrent’s original unchocking policy by (a) increasing the number of directly cooperating peers, (b) easing the load on seeders by having more peers act as data intermediaries, and (c) shortening the bootstrapping period for fresh peers.
Journals & Magazines
Vol. 74, Issue 1, pp. 1959-1970, January 2014.
I was born in Athens, Greece and used to live in Galatsi. My mother, Chrysoula, is now on pension and my father, Pavlos, works for the public sector. I have a brother, Konstantinos, who is an undergrad at Athens University of Economis and Business, Department of Statistics.
Life taught me not to forget people who stood by me and helped me realize my dreams; and there are plenty of them! First of all, I am deeply thankful to my parents who dedicated themselves to raising me and my brother. I am also grateful to my high-school teacher Aris Arabatzis who helped me find out my love for sciences. Last but not least, I feel deep respect for my undergrad advisors, Alex Delis and mema Roussopoulos, who helped me tremendously during my first research steps.
Apart from computer science, I am also interested in international history, politics, and macro-economics. I am a passionate opponent of neo-liberalism and austerity which, in our days, is an insurmountable obstacle to the prosperity of the EU according to the opinion of multiple prestigious elite academic members, including Joseph Stiglitz (Columbia University), Paul Krugman (Princeton University), Thomas Piketty Paris School of Economics), and many more.
My political views and generally my approach of life is absolutely reflected in the following quote:
“Above all, always be capable of feeling deeply any injustice committed against anyone, anywhere in the world.”
The preferable way to reach me is via e-mail.v.atlidakis -*at- gmail -*dot- com