On Immersible G-Structures

E-print/Working paper (2013)

On impact of weather on human mobility in cities

in Proceedings of the 17th International Conference on Web Information System Engineering (2016)

On indefinite sums weighted by periodic sequences

in Results in Mathematics (2019), 74(3), 95

For any integer $q\geq 2$ we provide a formula to express indefinite sums of a sequence $(f(n))_{n\geq 0}$ weighted by $q$-periodic sequences in terms of indefinite sums of sequences $(f(qn+p))_{n\geq 0 ... [more ▼]

For any integer $q\geq 2$ we provide a formula to express indefinite sums of a sequence $(f(n))_{n\geq 0}$ weighted by $q$-periodic sequences in terms of indefinite sums of sequences $(f(qn+p))_{n\geq 0}$, where $p\in\{0,\ldots,q-1\}$. When explicit expressions for the latter sums are available, this formula immediately provides explicit expressions for the former sums. We also illustrate this formula through some examples. [less ▲]

On Input/Output Argumentation Frameworks

in Proceedings of COMMA (2012)

This paper introduces Input/Output Argumentation Frameworks, a novel approach to characterize the behavior of an argumentation framework as a sort of black box exposing a well-defined external interface ... [more ▼]

This paper introduces Input/Output Argumentation Frameworks, a novel approach to characterize the behavior of an argumentation framework as a sort of black box exposing a well-defined external interface. As a starting point, we define the novel notion of semantics decomposability and analyze complete, stable, grounded and preferred semantics in this respect. Then we show as a main result that, under grounded, complete, stable and credulous preferred semantics, Input/Output Argumentation Frameworks with the same behavior can be interchanged without affecting the result of semantics evaluation of other arguments interacting with them [less ▲]

On Invertible Three Neighborhood Null-Boundary Uniform Cellular Automata

in Complex Systems (2011), 20(1), 4

On Key Recovery Attacks against Existing Somewhat Homomorphic Encryption Schemes

in Progress in Cryptology - LATINCRYPT 2014, Florianópolis 17-19 September 2014 (2014)

In his seminal paper at STOC 2009, Gentry left it as a future work to investigate (somewhat) homomorphic encryption schemes with IND-CCA1 security. At SAC 2011, Loftus et al. showed an IND-CCA1 attack ... [more ▼]

In his seminal paper at STOC 2009, Gentry left it as a future work to investigate (somewhat) homomorphic encryption schemes with IND-CCA1 security. At SAC 2011, Loftus et al. showed an IND-CCA1 attack against the somewhat homomorphic encryption scheme presented by Gentry and Halevi at Eurocrypt 2011. At ISPEC 2012, Zhang, Plantard and Susilo showed an IND-CCA1 attack against the somewhat homomorphic encryption scheme developed by van Dijk et al. at Eurocrypt 2010. In this paper, we continue this line of research and show that most existing somewhat homomorphic encryption schemes are not IND-CCA1 secure. In fact, we show that these schemes suffer from key recovery attacks (stronger than a typical IND-CCA1 attack), which allow an adversary to recover the private keys through a number of decryption oracle queries. The schemes, that we study in detail, include those by Brakerski and Vaikuntanathan at Crypto 2011 and FOCS 2011, and that by Gentry, Sahai and Waters at Crypto 2013. We also develop a key recovery attack that applies to the somewhat homomorphic encryption scheme by van Dijk et al., and our attack is more efficient and conceptually simpler than the one developed by Zhang et al.. Our key recovery attacks also apply to the scheme by Brakerski, Gentry and Vaikuntanathan at ITCS 2012, and we also describe a key recovery attack for the scheme developed by Brakerski at Crypto 2012. [less ▲]

On Koszul-Tate resolutions and Sullivan models

in Dissertationes Mathematicae (2018), 531

On Lambda and Time Operators: the Inverse Intertwining Problem Revisited

in International Journal of Theoretical Physics (2011), 50

An exact theory of irreversibility was proposed by Misra, Prigogine and Courbage, based on non-unitary similarity transformations Λ that intertwine reversible dynamics and irreversible ones. This would ... [more ▼]

An exact theory of irreversibility was proposed by Misra, Prigogine and Courbage, based on non-unitary similarity transformations Λ that intertwine reversible dynamics and irreversible ones. This would advocate the idea that irreversible behavior would originate at the microscopic level. Reversible evolution with an internal time operator have the intertwining property. Recently the inverse intertwining problem has been answered in the negative, that is, not every unitary evolution allowing such Λ-transformation has an internal time. This work contributes new results in this direction. [less ▲]

On Learning a Language in Transformation: Two final year students’ experiences in Chinese complementary education

E-print/Working paper (2011)

This paper is concerned with Chinese-Dutch children’s experiences with learning Chinese in the Netherlands. The paper presents basic facts about the Chinese language and its changing position in the world ... [more ▼]

This paper is concerned with Chinese-Dutch children’s experiences with learning Chinese in the Netherlands. The paper presents basic facts about the Chinese language and its changing position in the world, a brief history of the Chinese diaspora in the Netherlands and the context of Chinese complementary education. It analyses two written accounts of final year students’ experiences with learning Chinese, focusing on the ways of speaking about Chinese in relation to identity and education. In conclusion, it is argued that the students’ experiences urge us to consider Chinese as a polycentric language – i.e. as a language with multiple and competing centres of gravity – and as a language in transformation. [less ▲]

On Legality in Criminal Matters between Primacy of EU Law and National Constitutional Traditions. A Study of the Taricco Saga

in Mitsilegas, Valsamis; di martino, Alberto; Mancano, Leandro (Eds.) The Court of Justice and European Criminal Law Leading Cases in a Contextual Analysis (2019)

The present article retraces the history of the “Taricco saga” before the Court of Justice of the European Union (CJEU), which put in the spotlight the clashes between the primacy and effectiveness of EU ... [more ▼]

The present article retraces the history of the “Taricco saga” before the Court of Justice of the European Union (CJEU), which put in the spotlight the clashes between the primacy and effectiveness of EU law in the field of the protection of the financial interests of the EU, and the constitutional identities of the Member States with regard to fundamental rights in criminal law. Starting from the analysis of the first firm stance of the CJEU in the Taricco I judgment, to the Italian Constitutional Court’s reaction in defence of its own interpretation of the principle of legality in criminal law, the article then focuses on the final revirement of the CJEU towards a more tolerant position in M.A.S. and M.B.. The author, building upon the notion of constitutional pluralism and tolerance, does not consider such outcome as a defeat for the primacy of EU but rather welcomes it as a first step towards a more inclusive approach to the principle of primacy of EU law that necessarily encompasses fundamental rights and constitutional traditions, and that takes into due consideration the specificities of criminal law. [less ▲]