196,198 research outputs found
M. Addad et M. Benezech, L'irresponsabilité pénale des handicapés mentaux en droits français et anglo-saxons
No full textM. Addad et M. Benezech, L'irresponsabilité pénale des handicapés mentaux en droits français et anglo-saxons. In: Revue internationale de droit comparé. Vol. 31 N°2, Avril-juin 1979. pp. 447-448
M. Addad et M. Benezech, L'irresponsabilité pénale des handicapés mentaux en droits français et anglo-saxons
No full textM. Addad et M. Benezech, L'irresponsabilité pénale des handicapés mentaux en droits français et anglo-saxons. In: Revue internationale de droit comparé. Vol. 31 N°2, Avril-juin 1979. pp. 447-448
Diameter and k-Center in Sliding Windows
No full textIn this paper we develop streaming algorithms for the diameter problem and the k-center clustering problem in the sliding window model. In this model we are interested in maintaining a solution for the N most recent points of the stream. In the diameter problem we would like to maintain two points whose distance approximates the diameter of the point set in the window. Our algorithm computes a (3 + epsilon)-approximation and uses O(1/epsilon*ln(alpha)) memory cells, where alpha is the ratio of the largest and smallest distance and is assumed to be known in advance. We also prove that under reasonable assumptions obtaining a (3 - epsilon)-approximation requires Omega(N1/3) space.
For the k-center problem, where the goal is to find k centers that minimize the maximum distance of a point to its nearest center, we obtain a (6 + epsilon)-approximation using O(k/epsilon*ln(alpha)) memory cells and a (4 + epsilon)-approximation for the special case k = 2. We also prove that any algorithm for the 2-center problem that achieves an approximation ratio of less than 4 requires Omega(N^{1/3}) space
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States" By M. Carey.
No full text"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States: containing bried sketches of the moral and political character of those states.
By M. Carey, member of the American philosophical, and of the American Antiquarian Society, and author of The Olive Branch, Cindiciae Hibernicae, essays on banking, on political economy, and on internal improvement.
To which are now added the English editor's comments on the subject; together with Important Advice to Emigrants, and Cautions Against Impositions Practiced in the Outports
Improved Approximation Algorithms and Lower Bounds for Search-Diversification Problems
No full textWe study several questions related to diversifying search results. We give improved approximation algorithms in each of the following problems, together with some lower bounds.
1) We give a polynomial-time approximation scheme (PTAS) for a diversified search ranking problem [Nikhil Bansal et al., 2010] whose objective is to minimizes the discounted cumulative gain. Our PTAS runs in time n^{2^O(log(1/ε)/ε)} ⋅ m^O(1) where n denotes the number of elements in the databases and m denotes the number of constraints. Complementing this result, we show that no PTAS can run in time f(ε) ⋅ (nm)^{2^o(1/ε)} assuming Gap-ETH and therefore our running time is nearly tight. Both our upper and lower bounds answer open questions from [Nikhil Bansal et al., 2010].
2) We next consider the Max-Sum Dispersion problem, whose objective is to select k out of n elements from a database that maximizes the dispersion, which is defined as the sum of the pairwise distances under a given metric. We give a quasipolynomial-time approximation scheme (QPTAS) for the problem which runs in time n^{O_ε(log n)}. This improves upon previously known polynomial-time algorithms with approximate ratios 0.5 [Refael Hassin et al., 1997; Allan Borodin et al., 2017]. Furthermore, we observe that reductions from previous work rule out approximation schemes that run in n^õ_ε(log n) time assuming ETH.
3) Finally, we consider a generalization of Max-Sum Dispersion called Max-Sum Diversification. In addition to the sum of pairwise distance, the objective also includes another function f. For monotone submodular function f, we give a quasipolynomial-time algorithm with approximation ratio arbitrarily close to (1-1/e). This improves upon the best polynomial-time algorithm which has approximation ratio 0.5 [Allan Borodin et al., 2017]. Furthermore, the (1-1/e) factor is also tight as achieving better-than-(1-1/e) approximation is NP-hard [Uriel Feige, 1998]
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Dr. Glendon Swarthout
No full textHosted by Roger M. Busfield, MSU Assistant Professor of Speech and Theater, Meet the Author is designed to introduce a general audience to a contemporary author and their work through in-depth interviews. This episode features a conversation between Dr. Glendon Swarthout, prolific author and English professor at MSU, and assistant professors Sam S. Baskett and Theodore B. Strandness
Étude structurale des hydroxystannates CaSn(OH)6 et ZnSn(OH)6 par diffraction neutronique, absorption infrarouge et résonance magnétique nucléaire
No full textThe complete structure of cubic hydroxystannates, CaSn (OH)₆ and ZnSn(OH)₆, of space group Pn₃, has been determined by neutron diffraction at 4° K (powder techniques), and with the study of the spectrum of CaSn (OD)₅,₄₅ (OH)₀,₅₅. The 24 hydrogen atoms of the unit cell form two sorts of hydrogen bonds with double well-distributions and are on two sites 24 h statistically half occupied with some probability of movement from one position to another at 300° K. The hydrogen bonds, with lengths of 2,75-2,9 Å link different octahedra MO₆ — M = Ca, Zn or Sn — and form distorted squares around empty sites, near planes perpendicular to the three crystallographic axes. The double maxima of the infrared absorption spectrum are attributed to these two different hydrogen bonds. Any supplementary resolution is not observed at low tempera tures. The nuclear magnetic resonance of protons, observed in CaSn (OH)₆ and ZnSn (OH)₆, shows a line width in agreement with this model. Moreover, a narrow line shows the existence of inclusions of some supplementary water molecules in the crystals.La structure complète des hydroxystannates cubiques, CaSn (OH)₆ et ZnSn (OH)₆, de groupe d'espace Pn₃, a été déterminée par diffraction neutronique à 4° K (méthode des poudres), et à l'aide du composé deutéré CaSn (OD)₅,₄₅ (OH)₀,₅₅. Les 24 atomes d'hydrogène de la maille forment des liaisons hydrogène à double minima et sont répartis sur deux sites 24 h statistiquement occupés avec la même probabilité 1/2, et à 300° K une probabilité non nulle de saut de l'une à l'autre. Les liaisons hydrogène, de longueur 2,75 à 2,9 Å, joignent les différents octaèdres MO₆ — M = Ca, Zn ou Sn — et forment des quadrilatères presque réguliers centrés sur le site vide 6 d, au voisinage de plans perpendiculaires aux trois axes cristallographiques. Les doubles maxima du spectre d'absorption infrarouge sont attribués aux deux liaisons hydrogène différentes. Aucune résolution supplémentaire n'est observée à basse température. Le spectre de résonance magnétique nucléaire des protons observé dans CaSn (OH)₆ et ZnSn (OH)₆ présente une largeur de raie cohérente avec ce modèle ; de plus, une raie fine montre l'existence d'inclusions de molécules d'eau supplémentaires dans le cristal.Cohen-Addad Claudine. Étude structurale des hydroxystannates CaSn(OH)6 et ZnSn(OH)6 par diffraction neutronique, absorption infrarouge et résonance magnétique nucléaire. In: Bulletin de la Société française de Minéralogie et de Cristallographie, volume 91, 4, 1968. pp. 315-324
Simulation of thermal plant optimization and hydraulic aspects of thermal distribution loops for large campuses
No full textFollowing an introduction, the author describes Texas A&M University and its utilities system. After that, the author presents how to construct simulation models for chilled water and heating hot water distribution systems. The simulation model was used in a $2.3 million Ross Street chilled water pipe replacement project at Texas A&M University. A second project conducted at the University of Texas at San Antonio was used as an example to demonstrate how to identify and design an optimal distribution system by using a simulation model. The author found that the minor losses of these closed loop thermal distribution systems are significantly higher than potable water distribution systems. In the second part of the report, the author presents the latest development of software called the Plant Optimization Program, which can simulate cogeneration plant operation, estimate its operation cost and provide optimized operation suggestions. The author also developed detailed simulation models for a gas turbine and heat recovery steam generator and identified significant potential savings. Finally, the author also used a steam turbine as an example to present a multi-regression method on constructing simulation models by using basic statistics and optimization algorithms. This report presents a survey of the author??s working experience at the Energy Systems Laboratory (ESL) at Texas A&M University during the period of January 2002 through March 2004. The purpose of the above work was to allow the author to become familiar with the practice of engineering. The result is that the author knows how to complete a project from start to finish and understands how both technical and nontechnical aspects of a project need to be considered in order to ensure a quality deliverable and bring a project to successful completion. This report concludes that the objectives of the internship were successfully accomplished and that the requirements for the degree of Degree of Engineering have been satisfied
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