• Publications
  • Influence
About the Collatz conjecture
TLDR
An “efficient” algorithm for computing the number of iterations (recursive calls) of the Collatz function is given and a class of natural numbers for which the conjecture is true is described.
Some results on the Collatz problem
TLDR
The notion of “chain subtrees” in Collatz's tree is presented followed by a characterization theorem and some subclass of numbers which are labels for some chain subtrees, and another conjecture similar toCollatz's conjecture is given.
Faster Verification of RTL-Specified Systems via Decomposition and Constraint Extension
  • S. Andrei, A. Cheng
  • Computer Science
    27th IEEE International Real-Time Systems…
  • 5 December 2006
TLDR
An efficient method to perform verification and debugging of real-time systems specifications using decomposition techniques, which is to decompose the constraint graph into independent subgraphs so that it is no longer necessary to analyze the entire specification at once, but rather its individual and smaller components.
A rigorous methodology for specification and verification of business processes
TLDR
A semi-automatized framework to describe and analyse business processes is presented and how all the issues can be embedded in a unifying computer tool is suggested.
Verifying Linear Real-Time Logic Specifications
TLDR
The main ingredient of the LRTL class is the use of matrices instead of the constraint graph, as a more powerful data structure capable of performing the conversion from RTL to a prepositional formula, which will ensure the safety and feasibility of the given real-time system.
Utilizing semantic caching in ubiquitous environment
TLDR
This paper investigates the shortcomings of query trimming process and proposes a new solution to improve this process and investigates the applicability of semantic caching for many applications.
Extending the Storage Capacity And Noise Reduction of a Faster QR-Code
TLDR
A faster QR code which has more storage and can scan faster is proposed, which takes twice the time than normal QR code but it can also store double QR code data and is as faster as other QR code scanning technique.
Incremental satisfiability counting for real-time systems
  • S. Andrei, W. Chin
  • Computer Science
    Proceedings. RTAS . 10th IEEE Real-Time and…
  • 25 May 2004
TLDR
This paper proposes an alternative where the verification of timing constraints can be done by counting the number of truth assignments instead of Boolean satisfiability, and shows how incremental satisfiability counting can be applied to a well-known rail-road crossing example.
Automatic debugging of real-time systems based on incremental satisfiability counting
TLDR
This paper solves an even more challenging problem specified as future work, namely, the embedding and the integration of the debugger in autonomous systems which generate real-time control plans on-the-fly, since these specifications must meet timing constraints, but without human interaction.
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