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1

A Framework for the Verification of Parameterized Infinite-state Systems

Alberti F., Ghilardi S., Sharygina N.

Fundamenta Informaticae

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2017

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Vol. 150, nr 1

1--24

EN

We present our framework for the verification of parameterized infinite-state systems. The framework has been successfully applied in the verification of heterogeneous systems, ranging from distributed fault-tolerant protocols to programs handling unbounded data-structures. In such application domains, being able to infer quantified invariants is a mandatory requirement for successful results. Our framework differentiates itself from the state-of-the-art solutions targeting the generation of quantified safe inductive invariants: instead of monolitically exploiting a single static analysis technique, it is based on the effective integration of several analysis strategies. The paper targets the description of the engineering strategies adopted for a successful implementation of such an integrated framework, and presents the extensive experimental evaluation demonstrating its effectiveness.

2

Fabrication and characterization of TiO2 nanotube arrays on Ti membrane enlarged by anodic oxidation

Kim J. O., Cho C. H., Choi W. Y.

Materials Science Poland

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2015

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Vol. 33, No. 3

588--592

EN

TiO2 nanotube arrays have attracted a great deal of attention as photocatalytic and photoelectrode materials due to their large surface area, low cost and easy fabrication. Highly ordered TiO2 nanotube arrays for the photoelectrodes in dye-sensitized solar cells have been fabricated from Ti foil. However, the TiO2 nanotube arrays from Ti foil were not effective for the photocatalytic materials, because it had only one plane for the photocatalytic reaction. We have fabricated the TiO2 nanotube arrays from macroporous Ti metal membrane by anodic oxidation and tried to scale it up. Various factors were controlled to obtain the optimal microstructure of the TiO2 nanotube arrays on the surface of macroporous Ti metallic membrane. Microstructure and phase were studied by SEM and XRD, respectively. Temperature was a very important factor in anodic oxidation of large surface area. 10 μm thick TiO2 nanotube arrays on Ti metallic membrane having a large surface area were fabricated and some factors for scaling-up were discussed.

3

Generation of Asymmetrical Difference Patterns from Array Antennas

Satyanarayana M., Raju G. S. N.

International Journal of Electronics and Telecommunications

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2011

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Vol. 57, No. 2

185-190

EN

It is common to produce sum patterns from array antennas. These patterns are basically symmetric with one main lode in bore sight and symmetric sidelobe structure around the main beam. The antennas associated with the marine radars are required to produce patterns with asymmetric side lobes. Asymmetrical patterns are very useful for marine radars when ships sail in turbulent water where roll and pitch exists.In particular the sidelobes in one side are lower than those of the other side. It is also essential to produce difference patterns with asymmetric structure from the boresight direction. These patterns are required to have null in the bore sight and high difference slope in the same direction. When these patterns are required from marine radars, the side lobes associated with the difference pattern on the either side of the boresight is at the different heights. In the present work, such useful patterns are generated from the newly designed arrays. The amplitude and phase distributions are designed for small and large arrays. The radiation patterns are numerically computed and they are presented in u- domain.

4

Cellular Automata and Parallel Array Systems

Freund R., Tafill F.

Fundamenta Informaticae

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2007

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Vol. 78, nr 3

311-327

EN

The concept of n-dimensional parallel array systems is a useful means for the formal syntactic description of n-dimensional cellular automata. As n-dimensional parallel array systems are a more general model than n-dimensional cellular automata, they not only allow for the correct formal description of algorithms for n-dimensional cellular automata, but even allow for representing concise solutions for more general complex problems.

5

Representations of Recursively Enumerable Array Languages by Contextual Array Grammars

Fernau H., Freund R., Holzer M.

Fundamenta Informaticae

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2005

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Vol. 64, nr 1-4

159-170

EN

The main result proved in this paper shows that the natural embedding of any recursively enumerable one-dimensional array language in the two-dimensional space can be characterized by the projection of a two-dimensional array language generated by a contextual array grammar working in the t-mode and with norm one. Moreover, we show that any recursively enumerable one-dimensional array language can even be characterized by the projection of a two-dimensional array language generated by a contextual array grammar working in the t-mode where in the selectors of the contextual array productions only the ability to distinguish between blank and non-blank positions is necessary; in that case, the norm of the two-dimensional contextual array grammar working in the t-mode cannot be bounded.

6

Pattern analysis of scan sheets using an array model

Bhattacharya P., Wu H.

Image Processing & Communications

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2002

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Vol. 8, no 3

31-38

EN

We present a framework for the identification and processing of scan sheets by using an array model. Certain submatrices of the arrays representing scan sheets contain the designated information for processing. Based on certain algebraic operations on arrays, eective techniques are formulated for processing of a scan sheet output matrix.