My research interest are concurrecny theory, programming language theory, advanced type systems such as constructive type theory, and behavioral types, verification techniques.
Also, you can check my my dblp page.
A Sorted Semantic Framework for Applied Process CalculiLogical Methods in Computer Science 12(1), 2016doi pdf
Modal Logics for Nominal Transition Systems26th International Conference on Concurrency Theory (CONCUR 2015), 2015doi pdf html
The Psi-Calculi Workbench: A Generic Tool for Applied Process CalculiACM Transaction on Embedded Computing, ACSD Special Issue, Journal, 2015doi pdf
Session types for broadcastingProgramming Language Approaches to Concurrency and Communication-cEntric Software (PLACES), Workshop, 2014doi pdf
A sorted semantic framework for applied process calculi (extended abstract)Trustworthy Global Computing (TGC), Symposium, 2014doi pdf
A parametric tool for applied process calculiApplication of Concurrency to System Design (ACSD), Conference, 2013doi
PhD Thesis: Languages, Logics, Types and Tools for Concurrent System Modelling
I have recently defended my Ph.D. thesis on Sep 9. My opponent was associate professor Thomas T. Hildebrandt of IT University of Copenhagen. The grading comitee consisted of Prof. Nobuko Yoshida, Prof. Jan Frisco Groote, and Assoc. Prof. Tobias Wrigstad.
A concurrent system is a computer system with components that run in parallel and interact with each other. Such systems are ubiquitous and are notably responsible for supporting the infrastructure for transport, commerce and entertainment. They are very difficult to design and implement correctly: many different modeling languages and verification techniques have been devised to reason about them and verifying their correctness. However, existing languages and techniques can only express a limited range of systems and properties.
In this dissertation, we address some of the shortcomings of established models and theories in four ways: by introducing a general modal logic, extending a modelling language with types and a more general operation, providing an automated tool support, and adapting an established behavioural type theory to specify and verify systems with unreliable communication.
A modal logic for transition systems is a way of specifying properties of concurrent system abstractly. We have developed a modal logic for nominal transition systems. Such systems are common and include the pi-calculus and psi-calculi. The logic is adequate for many process calculi with regard to their behavioural equivalence even for those that no logic has been considered, for example, CCS, the pi-calculus, psi-calculi, the spi-calculus, and the fusion calculus.
The psi-calculi framework is a parametric process calculi framework that subsumes many existing process calculi. We extend psi-calculi with a type system, called sorts, and a more general notion of pattern matching in an input process. This gives additional expressive power allowing us to capture directly even more process calculi than was previously possible. We have reestablished the main results of psi-calculi to show that the extensions are consistent.
We have developed a tool that is based on the psi-calculi, called the psi-calculi workbench. It provides automation for executing the psi-calculi processes and generating a witness for a behavioural equivalence between processes. The tool can be used both as a library and as an interactive application.
Lastly, we developed a process calculus for unreliable broadcast systems and equipped it with a binary session type system. The process calculus captures the operations of scatter and gather in wireless sensor and ad-hoc networks. The type system enjoys the usual property of subject reduction, meaning that well-typed processes reduce to well-typed processes. To cope with unreliability, we also introduce a notion of process recovery that does not involve communication. This is the first session type system for a model with unreliable communication.
Languages, Logics, Types and Tools for Concurrent System ModellingNOVA LINCS Seminar2016-12-14
Advancing Concurrent System VerificationLicentiate Seminar, Uppsala University2014-10-20
A Parametric Tool for Applied Process Calculi
Psi-Calculi WorkbenchProFuN Project Seminar, Uppsala2014
Process Calculi for WSNs and moreProFuN Project Workshop, Uppsala2014
A Parametric Tool for Applied Process Calculi
Psi-Calculi WorkbenchACSD13, Barcelona, Spain2013
Presentation of DPLL(T)The SMT Reading Group, Uppsala2012-10-31
Psi-Calculi WorkbenchYR-CONCUR, New Castle, UK2012
My github account can be found at ramunas.
I have designed and implemented a tool for concurrent system modeling and verification based on the Psi-Calculi framework, called Psi-Calculi Workbench. The source code can be found at Psi-Calculi Workbench.