Search results for: Marc Petit

Items from 1 to 20 out of 85 results

article

Cobalt‐Catalyzed Bis‐Borylation of Quinolines: The Importance of the Cobalt Triplet State

Cassandre Cassiopée Bories, Geoffrey Gontard, Marion Barbazanges, Gilles Lemière, more

Chemistry – A European Journal > 29 > 69 > n/a - n/a

We report herein a mild stereo‐ and regioselective dearomatization of quinolines using the simple low valent HCo(N₂)(PPh₃)₃ complex that exhibits labile ligands. Conditions to form selectively, at room temperature, high‐valued 1,4‐bis‐borylated tetrahydroquinolines from simple starting heteroaromatic compounds have been developed. The efficient and selective functionalization of a large scope of quinolines...

article

A HELIXOL‐Derived Bisphosphinite Ligand: Synthesis and Application in Gold‐Catalyzed Enynes Cycloisomerization

Caleb Medena, Francesco Calogero, Quentin Lemoine, Corinne Aubert, more

European Journal of Organic Chemistry > 2019 > 11 > 2129 - 2137

The synthesis, optical resolution through derivatization, characterization, and utilization of a new helical bis(phosphinite gold) complex derived from HELIXOL are described. By using an efficient cobalt catalyst, neither irradiation nor high catalytic loading was required to access the helicene of interest. The latter was phosphorylated to afford a new chiral ligand that was studied. Especially,...

article

Phosphonate‐Mediated Immobilization of Rhodium/Bipyridine Hydrogenation Catalysts

Florian Forato, Anouar Belhboub, Julien Monot, Marc Petit, more

Chemistry – A European Journal > 24 > 10 > 2457 - 2465

RhL₂ complexes of phosphonate‐derivatized 2,2′‐bipyridine (bpy) ligands L were immobilized on titanium oxide particles generated in situ. Depending on the structure of the bipy ligand—number of tethers (1 or 2) to which the phosphonate end groups are attached and their location on the 2,2′‐bipyridine backbone (4,4′‐, 5,5′‐, or 6,6′‐positions)—the resulting supported catalysts showed comparable chemoselectivity...

article

Barriers to entry in frequency-regulation services markets: Review of the status quo and options for improvements

Olivier Borne, Klaas Korte, Yannick Perez, Marc Petit, more

Renewable and Sustainable Energy Reviews > 2018 > 81 > P1 > 605-614

As the share of intermittent renewable energy sources increases, it will be necessary to increase the volume of frequency-regulation reserves. New sources of reserves can be found in distributed energy resources: controllable loads, Electric Vehicles (EVs), distributed generation units. However, it is necessary to adapt the frequency-regulation reserve market design to allow these new resources to...

chapter

Electrical energy and mobility issues in Africa: Which complementarities?

Marc Petit, Mohamedou Macire, Paul Codani, Francis Roy, more

2017 IEEE PES PowerAfrica > 544 - 549

2017 IEEE PES/IAS PowerAfrica

Africa is on the way of a long term development to give access to energy to all citizens wherever they live, either in urban or rural areas. The energy access is mandatory to accelerate the economic growth. Besides, African citizens also require a better access to mobility, both individual or collective. African countries also encourage initiatives for clean electricity generation and clean mobility...

chapter

Market integration VS temporal granularity: How to provide needed flexibility resources?

Olivier Borne, Marc Petit, Yannic Perez

2017 14th International Conference on the European Energy Market (EEM) > 1 - 7

2017 14th International Conference on the European Energy Market (EEM)

The aim of this paper is to study the implications of the decision of the French regulator to join the FCR Cooperation, a common platform for cross-border procurement of primary reserve. Two aspects will be analyzed: 1) cost of procurement and increase of social welfare by cross-border procurement and 2) implications for entry of new entrants like aggregators of Electric Vehicles. Our results are...

article

RQL: A Query Language for Rule Discovery in Databases

Brice Chardin, Emmanuel Coquery, Marie Pailloux, Jean-Marc Petit

Theoretical Computer Science > 2017 > 658 > PB > 357-374

Promoting declarative approaches in data mining is a long standing theme, the main idea being to simplify as much as possible the way data analysts interact with their data. This paper goes into this direction by proposing a well-founded logical query language, SafeRL, allowing the expression of a wide variety of rules to be discovered against a database. By rules, we mean statements of the form “if...

chapter

Adaptive Strategies for Mining the Positive Border of Interesting Patterns: Application to Inclusion Dependencies in Databases

Fabien Marchi, Frédéric Flouvat, Jean-Marc Petit

Lecture Notes in Computer Science > Constraint-Based Mining and Inductive Databases > 81-101

Given the theoretical framework of Mannila and Toivonen [26], we are interested in the discovery of the positive border of interesting patterns, also called the most specific interesting patterns. Many approaches have been proposed among which we quote the levelwise algorithm and the Dualize and Advance algorithm. In this paper, we propose an adaptive strategy – complementary to these two algorithms...

article

Financial shortfall for electric vehicles: Economic impacts of Transmission System Operators market designs

Paul Codani, Yannick Perez, Marc Petit

Energy > 2016 > 113 > C > 422-431

Using electric vehicles as transmission system operator reserve providing units has been demonstrated as being both a feasible and a profitable solution. However, the surveys leading to these conclusions are always conducted either without considering the transmission system operator market rules, or using the existing ones from the local system operator. Nevertheless, such rules have potentially...

chapter

Provision of frequency-regulation reserves by distributed energy resources: Best practices and barriers to entry

Olivier Borne, Marc Petit, Yannick Perez

2016 13th International Conference on the European Energy Market (EEM) > 1 - 7

2016 13th International Conference on the European Energy Market (EEM)

As the share of intermittent renewable energy sources increases, it will be necessary to increase the volume of frequency regulation reserves. New sources of reserves can be found in the distributed energy resources (controllable loads, Electrical Vehicles (EVs), distributed generation units). However, it is necessary to adapt the frequency-regulation market-design in order to allow the participation...

article

Interaction between the voltage-droop and the frequency-droop control for multi-terminal HVDC systems

Samy Akkari, Jing Dai, Marc Petit, Xavier Guillaud

IET Generation, Transmission & Distribution > 2016 > 10 > 6 > 1345 - 1352

Multi-terminal DC systems must provide a high level of reliability and may have to support the interconnected AC grids. This can be achieved by providing AC/DC converters with a dual controller combining both the voltage-droop and the frequency-droop control techniques. In this article, the coupling between those droops is theoretically investigated and quantified, and a proposed corrected value of...

chapter

iZi: A New Toolkit for Pattern Mining Problems

Frédéric Flouvat, Fabien Marchi, Jean-Marc Petit

Lecture Notes in Computer Science > Foundations of Intelligent Systems > Knowledge Discovery and Data Mining - Advances > 131-136

Pattern mining problems are useful in many applications. Due to a common theoretical background for such problems, generic concepts can be re-used to easier the development of algorithms. As a consequence, these problems can be implemented with only minimal effort, i.e. programmers do not have to be aware of low-level code, customized data structures and algorithms being available for free. A toolkit,...

chapter

Efficient Discovery of Functional Dependencies and Armstrong Relations

Stéphane Lopes, Jean-Marc Petit, Lotfi Lakhal

Lecture Notes in Computer Science > Advances in Database Technology — EDBT 2000 > Data Mining > 350-364

In this paper, we propose a new efficient algorithm called Dep-Miner for discovering minimal non-trivial functional dependencies from large databases. Based on theoretical foundations, our approach combines the discovery of functional dependencies along with the construction of real-world Armstrong relations (without additional execution time). These relations are small Armstrong relations taking...

chapter

Approximating a Set of Approximate Inclusion Dependencies

Fabien Marchi, Jean-Marc Petit

Advances in Intelligent and Soft Computing > Intelligent Information Processing and Web Mining > Invited Session: KDD and Facial Recognition > 633-640

Approximating a collection of patterns is a new and active area of research in data mining. The main motivation lies in two observations : the number of mined patterns is often too large to be useful for any end-users and user-defined input parameters of many data mining algorithms are most of the time almost arbitrary defined (e.g. the frequency threshold). In this setting, we apply the results...

chapter

Managing Pervasive Environments through Database Principles: A Survey

Yann Gripay, Frédérique Laforest, Jean-Marc Petit

Studies in Computational Intelligence > Advances in Data Management > Intelligent Agents > 277-298

As initially envisioned by Mark Weiser, pervasive environments are the trend for the future of information systems. Heterogeneous devices, from small sensors to framework computers, are all linked though ubiquitous networks ranging from local peer-to-peer wireless connections to the world-wide Internet. Managing such environments, so as to benefit from its full potential of available resources providing...

chapter

The iZi Project: Easy Prototyping of Interesting Pattern Mining Algorithms

Frédéric Flouvat, Fabien Marchi, Jean-Marc Petit

Lecture Notes in Computer Science > New Frontiers in Applied Data Mining > 1-15

In the last decade, many data mining tools have been developed. They address most of the classical data mining problems such as classification, clustering or pattern mining. However, providing classical solutions for classical problems is not always sufficient. This is especially true for pattern mining problems known to be “representable as set”, an important class of problems which have many...

chapter

Chaotic Scattering in Planetary Rings

Jean-Marc Petit

Lecture Notes in Physics > Singularities in Gravitational Systems > 114-144

The gravitational interaction of two small satellites, on initially close circular, coplanar orbits leads to a one-parameter family of solutions. When varying the parameter h of the family, the solution changes continuously on an interval and then undergoes a sudden change. The set of discontinuities has a Cantor-like structure. Similar phenomena have been observed in other problems of scattering...

chapter

Samples for Understanding Data-Semantics in Relations

Fabien Marchi, Stéphane Lopes, Jean-Marc Petit

Lecture Notes in Computer Science > Foundations of Intelligent Systems > Intelligent Information Systems > 565-573

From statistics, sampling technics were proposed and some of them were proved to be very useful in many database applications. Rather surprisingly, it seems these works never consider the preservation of data semantics. Since functional dependencies (FDs) are known to convey most of data semantics, an interesting issue would be to construct samples preserving FDs satisfied in existing relations. ...

chapter

Combining Logic and Probabilities for Discovering Mappings between Taxonomies

Rémi Tournaire, Jean-Marc Petit, Marie-Christine Rousset, Alexandre Termier

Lecture Notes in Computer Science > Knowledge Science, Engineering and Management > 530-542

In this paper, we investigate a principled approach for defining and discovering probabilistic mappings between two taxonomies. First, we compare two ways of modeling probabilistic mappings which are compatible with the logical constraints declared in each taxonomy. Then we describe a generate and test algorithm which minimizes the number of calls to the probability estimator for determining those...

chapter

Efficient Algorithms for Mining Inclusion Dependencies

Fabien Marchi, Stéphane Lopes, Jean-Marc Petit

Lecture Notes in Computer Science > Advances in Database Technology — EDBT 2002 > Advanced Querying > 464-476

Foreign keys form one of the most fundamental constraints for relational databases. Since they are not always defined in existing databases, algorithms need to be devised to discover foreign keys. One of the underlying problems is known to be the inclusion dependency (IND) inference problem. In this paper a new data mining algorithm for computing unary INDs is given. From unary INDs, we also propose...

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INFONA - science communication portal

Search results for: Marc Petit

Cobalt‐Catalyzed Bis‐Borylation of Quinolines: The Importance of the Cobalt Triplet State

A HELIXOL‐Derived Bisphosphinite Ligand: Synthesis and Application in Gold‐Catalyzed Enynes Cycloisomerization

Phosphonate‐Mediated Immobilization of Rhodium/Bipyridine Hydrogenation Catalysts

Barriers to entry in frequency-regulation services markets: Review of the status quo and options for improvements

Electrical energy and mobility issues in Africa: Which complementarities?

Market integration VS temporal granularity: How to provide needed flexibility resources?

RQL: A Query Language for Rule Discovery in Databases

Adaptive Strategies for Mining the Positive Border of Interesting Patterns: Application to Inclusion Dependencies in Databases

Financial shortfall for electric vehicles: Economic impacts of Transmission System Operators market designs

Provision of frequency-regulation reserves by distributed energy resources: Best practices and barriers to entry

Interaction between the voltage-droop and the frequency-droop control for multi-terminal HVDC systems

iZi: A New Toolkit for Pattern Mining Problems

Efficient Discovery of Functional Dependencies and Armstrong Relations

Approximating a Set of Approximate Inclusion Dependencies

Managing Pervasive Environments through Database Principles: A Survey

The iZi Project: Easy Prototyping of Interesting Pattern Mining Algorithms

Chaotic Scattering in Planetary Rings

Samples for Understanding Data-Semantics in Relations

Combining Logic and Probabilities for Discovering Mappings between Taxonomies

Efficient Algorithms for Mining Inclusion Dependencies

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