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Yuen-Nakazawa Lab (SQLAB)
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The lab provides mathematical guarantees of program correctness.
AboutAbout the lab
Mathematically supporting the correctness of software.
To guarantee that programs behave as their developers intended, the Yuen-Nakazawa Lab studies how to prove, using mathematical methods, that programs satisfy specific properties.
Because the possible inputs are generally infinite and cannot all be tested, the lab studies model checking, abstract interpretation, type systems, and related techniques.
The lab also studies improving software reliability through reversible execution, a theory that treats formal languages through algebra, and development methods for real-time concurrent systems.
The lab belongs to the Department of Information Systems, Graduate School of Informatics, Nagoya University.
Key terms
- Reversible computation
- An approach that defines the information necessary and sufficient for execution so that a program can be executed reversibly
- Automaton
- A mathematical model for describing the symbol strings and computation rules that computers handle
- Real-time concurrent system
- A combination of multiple systems running concurrently, most of which are required to complete processing within a set time
ResearchResearch themes
The lab studies methods for mathematically guaranteeing that software runs correctly. Its research covers program analysis and verification, reversible execution, the theory of formal languages, and development methods for real-time concurrent systems.
*Illustrative imageMathematically proving properties of programs
This research uses mathematical methods to prove that programs satisfy specific properties. It covers model checking, abstract interpretation, type systems, and more, and many parts of the proofs can be automated by computer.
*Illustrative imageAnalyzing concurrent programs through reversible execution
Based on reversible computation, which stores the information used during execution, the lab studies frameworks that improve the reliability of software, especially concurrent software, through means such as debugging.
*Illustrative imageUnderstanding formal languages through algebra
The lab works on algebraic language theory, which understands the structure of formal languages and automata from an algebraic perspective. It extends correspondences that hold for regular languages to more complex language classes such as context-free languages.
*Illustrative imageDevelopment methods for real-time concurrent systems
The lab studies methods for developing real-time concurrent systems with guaranteed correct behavior at low cost. Its main areas are the foundational theory of formal methods such as process algebra and timed automata, as well as model checking and code generation.
MembersFaculty
The members of the Yuen-Nakazawa Lab consist of faculty, administrative assistants, doctoral, master's, and undergraduate students, and NUPACE students.As of 2026
- ProfessorShoji Yuen
- Associate ProfessorKoji Nakazawa
- Assistant ProfessorYusuke Inoue
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Coder screen shot” Wikideas1 / CC0 (cropped)
- Mathematically proving properties of programs: “Mathematical proof with a fatal error” Dino / CC BY-SA 4.0 (cropped)
- Analyzing concurrent programs through reversible execution: “Code on computer monitor (Unsplash)” Markus Spiske markusspiske / CC0 (cropped)
- Understanding formal languages through algebra: “Highlighted LaTeX example” Wikideas1 / CC0 (cropped)
- Development methods for real-time concurrent systems: “LC-P computer keyboard - IC encapsulated on printed circuit board-3464” Raimond Spekking / CC BY-SA 4.0 (cropped)
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（Banbara/Soh Lab.） ): “Samurai-sudoku” „Markus Weigel“ / CC BY-SA 4.0 (cropped)
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