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We introduce a notion of first and second fundamental form ... [more ▼]We approach the study of totally real immersions of smooth manifolds into holomorphic Riemannian space forms of constant sectional curvature -1. We introduce a notion of first and second fundamental form, we prove that they satisfy a similar version of the classic Gauss-Codazzi equations, and conversely that solutions of Gauss-Codazzi equations are immersion data of some equivariant map. This study has some interesting geometric consequences: 1) it provides a formalism to study immersions of surfaces into SL(2,C) and into the space of geodesics of H^3; 2) it generalizes the classical theory of immersions into non-zero curvature space forms, leading to a model for the transitioning of hypersurfaces among H^n, AdS^n, dS^n and S^n; 3) we prove that a holomorphic family of immersion data corresponds to a holomorphic family of immersions, providing an effective way to construct holomorphic maps into the SO(n,C)-character variety. In particular we will point out a simpler proof of the holomorphicity of the complex landslide; 4) we see how, under certain hypothesis, complex metrics on a surface (i.e. complex bilinear forms of its complexified tangent bundle) of constant curvature -1 correspond to pairs of projective surfaces with the same holonomy. Applying Bers Double Uniformization Theorem to this construction we prove a Uniformization Theorem for complex metrics on a surface. [less ▲]Detailed reference viewed: 46 (0 UL) On impact of weather on human mobility in citiesPang, Jun ; Zablotskaia, Polina; Zhang, Yangin Proceedings of the 17th International Conference on Web Information System Engineering (2016)Detailed reference viewed: 123 (4 UL) On Improving Slant Wet delays for Tracking Severe Weather Events: An evaluation During Two Storms in EuropeTeferle, Felix Norman ; Hunegnaw, Addisu ; Duman, Huseyin et alScientific Conference (2022, December 14)Climate change has led to an increase in the frequency and severity of weather events with intense precipitation and, subsequently, a greater susceptibility of communities around the world to flash ... [more ▼]Climate change has led to an increase in the frequency and severity of weather events with intense precipitation and, subsequently, a greater susceptibility of communities around the world to flash flooding. Networks of ground-based Global Navigation Satellite System (GNSS) stations enable the measurement of integrated water vapor along slant pathways, providing three-dimensional (3D) water vapor distributions at low-cost and in real-time. This makes these data a valuable complementary source of information for tracking storm events and predicting their paths. However, it is well established that residual modelling errors and multipath (MP) effects at GNSS stations do impact incoming signals, especially at low elevations and during storms when the atmospheric conditions change rapidly. Until now, the bulk of GNSS products for meteorology are estimates of the more conventional zenith total delays and horizontal gradients, but these products may not be most appropriate for determining 3D distributions of water vapor during convective storm events. In this study we investigate the impact of residual-phase-corrected and multipath-corrected slant wet delay (SWD) estimates on tracking extreme weather events using two events in Europe that led to flooding, damage to property and loss of life. We employed Precise Point Positioning (PPP) with integer ambiguity resolution to generate station-specific MP correction maps. The spatial stacking was carried out in congruent cells with an optimal resolution in elevation and azimuth at the local horizon but with decreasing azimuth resolution as the elevation angle increases. This permits an approximately equal number of observations allocated to each cell. In our analysis we recovered the one-way SWD by adding GNSS post-fit phase residuals, representing the non-isotropic component of the SWD, i.e., the higher-order inhomogeneity. Using the derived MP maps in a final step, the one-way SWD were improved to employ them for the analysis of the weather event. Moreover, we validated the SWD between ground-based water-vapor radiometry and GNSS-derived SWD for different elevation angles. Furthermore, the spatio-temporal fluctuations in the SWD as measured by GNSS closely mirrored the moisture field from the ERA5 re-analysis associated with this severe weather event [less ▲] On indefinite sums weighted by periodic sequencesMarichal, Jean-Luc in Results in Mathematics (2019), 74(3), 95For 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 ▲]Detailed reference viewed: 148 (15 UL) On Input Market Frictions and Estimation of Factors DemandDupuy, Arnaud ; Sorensen, Toddin Southern Economic Journal (2014)Detailed reference viewed: 91 (4 UL) On Input/Output Argumentation FrameworksBaroni, Pietro ; Boella, Guido ; Cerutti, Federico et alin 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 ▲]Detailed reference viewed: 54 (3 UL) On Intersection Codes and Iterative DecodingFranck, Christian Doctoral thesis (2013)Detailed reference viewed: 173 (28 UL) On Invertible Three Neighborhood Null-Boundary Uniform Cellular AutomataGhosh, Soumyabrata ; Maiti, Nirmalya S.; Chaudhuri, P. Pal et alin Complex Systems (2011), 20(1), 4Detailed reference viewed: 74 (4 UL) On Judgment Aggregation in Abstract ArgumentationCaminada, Martin ; Pigozzi, Gabriella in Autonomous Agents & Multi-Agent Systems (2011), 22(1), 64102Judgment aggregation is a field in which individuals are required to vote for or against a certain decision (the conclusion) while providing reasons for their choice. The reasons and the conclusion are ... [more ▼]Judgment aggregation is a field in which individuals are required to vote for or against a certain decision (the conclusion) while providing reasons for their choice. The reasons and the conclusion are logically connected propositions. The problem is how a collective judgment on logically interconnected propositions can be defined from individual judgments on the same propositions. It turns out that, despite the fact that the individuals are logically consistent, the aggregation of their judgments may lead to an inconsistent group outcome, where the reasons do not support the conclusion. However, in this paper we claim that collective irrationality should not be the only worry of judgment aggregation. For example, judgment aggregation would not reject a consistent combination of reasons and conclusion that no member voted for. In our view this may not be a desirable solution. This motivates our research about when a social outcome is ‘compatible’ with the individuals’ judgments. The key notion that we want to capture is that any individual member has to be able to defend the collective decision. This is guaranteed when the group outcome is compatible with its members views. Judgment aggregation problems are usually studied using classical propositional logic. However, for our analysis we use an argumentation approach to judgment aggregation problems. Indeed the question of how individual evaluations can be combined into a collective one can also be addressed in abstract argumentation. We introduce three aggregation operators that satisfy the condition above, and we offer two definitions of compatibility. Not only does our proposal satisfy a good number of standard judgment aggregation postulates, but it also avoids the problem of individual members of a group having to become committed to a group judgment that is in conflict with their own individual positions. [less ▲]Detailed reference viewed: 112 (1 UL) On Key Recovery Attacks against Existing Somewhat Homomorphic Encryption SchemesChenal, Massimo ; Tang, Qiang 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 ▲]Detailed reference viewed: 221 (30 UL) On Kilian's Randomization of Multilinear Map EncodingsCoron, Jean-Sébastien ; Pereira, Vitor in Coron, Jean-Sébastien; Pereira, Vitor (Eds.) On Kilian's Randomization of Multilinear Map Encodings (2019)Detailed reference viewed: 88 (14 UL) On Koszul-Tate resolutions and Sullivan modelsPistalo, Damjan ; Poncin, Norbert in Dissertationes Mathematicae (2018), 531Detailed reference viewed: 274 (36 UL) On L2 error bounds between systemsSalinas, A.; Papachristodoulou, A.; Goncalves, Jorge Scientific Conference (2006)Detailed reference viewed: 42 (1 UL) On Lambda and Time Operators: the Inverse Intertwining Problem RevisitedGómez-Cubillo, Fernando; Suchanecki, Zdzislaw ; Villullas, S.in International Journal of Theoretical Physics (2011), 50An 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 ▲]Detailed reference viewed: 99 (0 UL) On Lambda transformation approach to the theory of irreversibilityGómez-Cubillo, Fernando; Suchanecki, Zdzislaw in Bussei Kenkyu (2012), 97(3), 398-413Detailed reference viewed: 45 (2 UL) On Learning a Language in Transformation: Two final year students’ experiences in Chinese complementary educationLi, Jinling; Juffermans, Kasper 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 ▲]Detailed reference viewed: 79 (0 UL) On Learning Navigation Behaviors for Small Mobile Robots With Reservoir Computing ArchitecturesAntonelo, Eric Aislan ; Schrauwen, B.in IEEE Transactions on Neural Networks and Learning Systems (2015), 26(4), 763-780Detailed reference viewed: 111 (5 UL) On Legality in Criminal Matters between Primacy of EU Law and National Constitutional Traditions. A Study of the Taricco SagaAllegrezza, Silvia 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 ▲]Detailed reference viewed: 143 (6 UL)