277 research outputs found
E(s^2)-optimal and minimax-optimal cyclic supersaturated designs via multi-objective simulated annealing
No full textIn this paper, we are interested in finding E(s2)E(s2)-optimal and minimax-optimal, two level cyclic structured supersaturated designs through a metaheuristic approach guided via multi-objective simulated annealing (SA). Our construction method is based on cyclic generators. This class of metaheuristics enabled us to build supersaturated designs for q=2,4,…,14q=2,4,…,14 generators. Comparisons are made with previous works and it is shown that SA gives promising results for supersaturated designs that satisfy more than one optimality property. Furthermore, we provide some lower bounds and explicit formulas for the frequency of the elements with maximum absolute values that appear in the information matrix, when these values are 2, 4 or 6
A hybrid SAGA algorithm for the construction of E(s^2)-optimal cyclic supersaturated designs
No full textConstructing Orthogonal Designs in Powers of Two: Gröbner Bases Meet Equational Unification
No full textIn the past few decades, design theory has grown to encompass a wide variety of research directions. It comes as no surprise that applications in coding theory and communications continue to arise,
and also that designs have found applications in new areas. Computer science has provided a new source of applications of designs, and simultaneously a field of new and challenging problems in design theory. In this paper, we revisit a construction for orthogonal designs using the multiplication tables of Cayley-Dickson algebras of dimension . The desired orthogonal designs can be described by a system of equations with the aid of a Groebner basis computation. For orders greater than 16 the combinatorial explosion of the problem gives rise to equations that are unfeasible to be handled by traditional search algorithms. However, the structural properties of the designs make this problem possible to be tackled in terms of rewriting techniques, by equational unification. We establish connections between central concepts of design theory and equational unification where equivalence operations of designs point to the computation of a minimal complete set of unifiers. These connections make viable the computation of some types of orthogonal designs that have not been found before with the aforementioned algebraic modelling
Recent experiences of urban ritual performances, inspired by Dimitris Pikionis's walkways in Athens.
No full textDimitris Pikionis (1887-1968), architect and teacher, started his career by proposing new architecture based on ‘trans Hellenic forms’ or transcendent continuing forms from antiquity to modern times. Pikionis’s acquaintance with Giorgio de Chirico led to his new approach of ‘Hellenism’ (or Greekness) through vernacular art in conjunction with Modernism. For several decades after Greece liberation from Turks, several architects proposed bizarre plans for the area around and on the top of the Acropolis, such as the proposal of a palace of the first king, in which the Parthenon was reduced to a mere decorative feature of the palace gardens. Several other proposals until early 1950s proposed archaeological park areas. However the search of Greekness had remained elusive and ambiguous in all these proposals. Only Dimitris Pikionis captured what many authors, suggested as the close relationship between nature and culture; the temples adored the gods of the earth and the plants, such as the olive tree. Dimitris Pikionis names as ‘homorhythmia’ the rhythm that governs collective forms of life, of the topography of the earth and of art and architecture. His masterplan of re-landscaping the area surrounding the Sacred Rock of Acropolis lets nature envelope the ancient ruins by obeying nature principles. Pikionis was inspired by the painters of his time such as Cezanne, Paul Klee and Giorgio de Chirico, but attends forms rather than colours. Athens has now re-discovered the work of Dimitris Pikionis and his teaching to his students in strong rooted Classicism and culture in relation to nature. He directed and supervised his students and workers building new urban pathways by using marble and stone fragments spread around the hill of the Acropolis from ruined temples and houses from Classic to Byzantine eras. His paths are still followed by locals and visitors. Recently these paths were tested by the author, her colleagues and students of arts and architecture, participating in Dance Architecture Spatiality, an Erasmus research project. Students were inspired by the paths and surrounding areas and created an urban ritual performance with the guidance of a well-known choreographer; people present in that area during rehearsals and the main performance became spontaneous participants and enjoyed a different urban and cultural walk to the top of a hill opposite to the Acropolis, a celebration of Classicism through modern human behaviours. In his Inhabiting Time, Juhani Pallasmaa also refers to the “device of time in architecture” by affirming that Pikionis’s pathways of natural and found man-made ancient stones “evoke a dense architectural narrative with a feeling of deep time; … the layering of styles and the juxtaposition of different uses and activities – commonplace and ceremonial, utilitarian and symbolic – place us comfortably in the continuum of lives through centuries”
NÃO-STILL LIFE: UM RETRATO-MOSAICO DE DIMITRIS PAPAIOANNOU
No full textThe original review essay “Non-Still Life: a Mosaic Portrait of Dimitris Papaioannou” offers a panoramic view of the work of the greek painter and choreographer Dimitris Papaoannou, from his artistic initiation to the international tour of Still Life, and it was written based on the analysis of materios form the press recording made available by the artist and texts developed by the author herself. The preceding presentation, “The Mosaic-Dimitris by Aikaterini Delikonstantinidou” giver support to the translation by pointing out relevant aspects of its process and organization in six items. In the “Preliminary Notes”, the figures of speech presented in the title are developed, which reiterate the author's objectives. The "Introduction" draw connections between art and life that will be further explored by the following item, “The Body at the Center of the Narrative". In “Large-scale work at sports events”, the artist's expectations and contradictions are discussed. In “Choreographies of Existence”, highlights the conceptual choreographic synthesis that develops from how the artist deals with the reception of his pieces, and finally the author reaffirms in the “Concluding Notes” the multiplicity and breadth of the choreographer's production, associating them to philosophical questions related to the the piece named in the title. KeywordsDimitris Papaioannou. Contemporary Greek Theater. Contemporary Theater Direction. Choreography. Physical Theater.O ensaio original "Non-Still Life: a Mosaic Portrait of Dimitris Papaioannou" oferece uma vista panorâmica da obra do pintor e coreógrafo grego Dimitris Papaoannou, desde sua iniciação artística até a turnê internacional de Still Life e foi escrito com base na apreciação e análise dos registros disponibilizados pela imprensa, pelo artista ou desenvolvidos pela própria autora. A apresentação que o precede, "O Mosaico-Dimitris de Aikaterini Delikonstantinidou" vem dar apoio à tradução, pontuando aspectos relevantes acerca do seu processo e organização em seis itens. Nas "Noções Preliminares", desenvolvem-se as figuras de linguagem presentes no título, que reiteram os objetivos da autora. Na "Introdução" são delineadas as conexões entre arte e vida que são aprofundadas no tópico seguinte, "O Corpo no Centro da Narrativa". Em "Trabalhos de larga escala em eventos esportivos", expectativas e contradições do artista são discutidas. Em "Coreografias da Existência", ressalta-se a síntese coreográfica conceitual que vai se desenvolvendo a partir de como o artista encara a recepção das peças e, finalmente, a autora reafirma nas "Notas Conclusivas" a multiplicidade e amplitude da produção do coreógrafo, associando-as a questões filosóficas relativas ao espetáculo do título. Palavras-chaveDimitris Papaioannou. Teatro Grego Contemporâneo. Encenação Contemporânea. Coreografia. Teatro Físico
Mobile movie recommendations with linked data
No full textThe recent spread of the so called Web of Data has made available a vast amount of interconnected data, paving the way to a new generation of ubiquitous applications able to exploit the information encoded in it. In this paper we present Cinemappy, a location-based application that computes contextual movie recommendations. Cinemappy refines the recommendation results of a content-based recommender system by exploiting contextual information related to the current spatial and temporal position of the user. The content-based engine leverages graph information within DBpedia, one of the best-known datasets publicly available in the Linked Open Data (LOD) project
Does Culture Matter? The Relevance of Culture in Politics and Governance in the Euro-Mediterranean Zone. ZEI Discussion Paper: 2002: C 111
No full text[Table of Contents]: Culture and Governance in the Mediterranean – A Rationale and Overview, by Indra de Soysa and Peter Zervakis; The Relevance of Culture in Democratic Governance – Lessons from the Western Hemisphere, by Lawrence E. Harrison; Culture in Politics and Governance – European Experiences, by Klaus von Beyme; Penser L’Espace Mediterranean, by Mohammed Arkoun; Muslim and Western Civilization – Is Co-Prosperity and Peace Possible?, by Erich Weede; Political Culture and Democracy in Turkey, by Ergun Özbudun; The Crisis of Political Culture in the Arab World – A Conflict of Paradigms, by Paul Salem; Euro-Mediterranean Formations – Cultural Imperatives of System Change, by Dimitris K. Xenakis and Dimitris Chryssochoou; Cross-cultural Currents in the Mediterranean – What Prospects, Stephan Calleya; Politics and Governance in the Mediterranean, by Franck Biancheri; The Mediterranean - New Directions of Research and Policy-Making, by Ludger Kühnha
Cyber Threats Monitoring: Experimental Analysis of Malware Behavior in Cyberspace
No full textPart 2: Security EngineeringInternational audienceCyberspace is a borderless new universe in which all actors, including States, share information and communications technologies, now indispensable to the modern lifestyle. Starting from the beginning of the 21st century, the ability to leverage the cyberspace has become the most important source of power. Due to the proliferation of ICT systems into all aspects of life, the importance of information for political matters has increased awfully. State and non-State actors can use this power to achieve objectives into cyberspace and physical world. Low cost and high potential impact make cyber-power attractive to all actors. In fact, cyber threats have grown exponentially with the proliferation of the cyberspace infrastructures. Consequently, cyberspace has become a war-fighting domain with the potential to destroy or make useless logical, physical, technical, and virtual infrastructure, damaging in fact critical National capabilities.This scenario forces all national institutions to a review of their defense strategies, because of the difficulties to identify the actors of a cyber-attack. It then becomes necessary to gain a broader view of the problem to acquire more detailed information, useful to identify such sources of cyber-attacks. This new point of view can be achieved by using the analytical method developed by the authors and applied to data streams flowing across the cyberspace. In this way we can collect, detect, isolate and analyze the behavior of those malware that are acting as cyber weapons, through the implementation of an honeypot-based system such as the one presented in this paper
An algorithmic construction of four-level response surface designs
No full textResponse surface methodology is widely used for developing, improving, and optimizing processes in various fields. In this article, we present a method for constructing four-level design matrices in order to explore and optimize response surfaces where the predictor variables are each at four equally spaced levels, by utilizing a genetic algorithm. The produced designs achieve both properties of near-rotatability and estimation efficiency.<br/
Automated reasoning for knot semigroups and π-orbifold Groups of Knots
No full textThe paper continues the first author’s research which shows that automatic reasoning is an effective tool for establishing properties of algebraic constructions associated with knot diagrams. Previous research considered involutory quandles (also known as keis) and quandles. This paper applies automated reasoning to knot semigroups, recently introduced and studied by the second author, and π -orbifold groups of knots. We test two conjectures concerning knot semigroups (specifically, conjectures aiming to describe knot semigroups of diagrams of the trivial knot and knot semigroups of 4-plat knot diagrams) on a large number of examples. These experiments enable us to formulate one new conjecture. We discuss applications of our results to a classical problem of the knot theory, determining whether a knot diagram represents the trivial knot
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