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1.
2.
Quantum-mechanical reaction rate constants were calculated from centroid molecular dynamics (CMD) simulations, for the case of barrier crossing in an asymmetrical double-well potential bilinearly coupled to a harmonic bath. The calculation is based on a recently proposed formulation of the reaction rate constant in terms of the position—flux correlation function, which can be approximated via CMD in a well-defined manner. The predictions of CMD and various simplified versions of it are compared to exact results, which were obtained via the quasi-adiabatic propagator path integral (QUAPI) method, and/or path integral quantum transition state theory (PI-QTST). The predictions based on CMD are found to be in good agreement with both. 相似文献
3.
Lerer Barbara; Warner John; Friedman Eitan; Vincent George; Gamzu Elkan 《Canadian Metallurgical Quarterly》1985,99(4):661
The rat magnocellular basal forebrain (MNBF) is homologous to the human nucleus basalis of Meynert, a structure implicated in the cholinergic hypothesis of cognitive impairment in Alzheimer's disease (AD). In the present study, 18 male Sprague-Dawley rats with kainic acid lesions in the MNBF were compared with 6 unoperated controls, 10 sham-operated controls, and 6 controls injected with kainic acid in the cortical area directly above the MNBF. MNBF lesions depleted choline acetyltransferase in cortex but not in striatum or hippocampus. Cortical dopamine levels were unchanged; serotonin levels were unchanged in hippocampus and parietal cortex but decreased in frontal cortex. Compared with controls, MNBF-lesioned Ss were impaired in 24-hr retention, but not acquisition, of a passive avoidance task with escapable footshock. The groups did not differ in mean number of daily avoidances on a barpress active avoidance task, although learning was slower in MNBF-lesioned Ss. In a serial spatial discrimination reversal test, MNBF-lesioned Ss performed significantly worse than controls. This model may be useful for studying the role of the cholinergic system in memory and possibly for developing treatment strategies to alleviate the cognitive dysfunction of AD. (63 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
4.
Eitan Frachtenberg 《World Wide Web》2009,12(4):441-460
Semantic Web search is a new application of recent advances in information retrieval (IR), natural language processing, artificial
intelligence, and other fields. The Powerset group in Microsoft develops a semantic search engine that aims to answer queries
not only by matching keywords, but by actually matching meaning in queries to meaning in Web documents. Compared to typical
keyword search, semantic search can pose additional engineering challenges for the back-end and infrastructure designs. Of
these, the main challenge addressed in this paper is how to lower query latencies to acceptable, interactive levels. Index-based
semantic search requires more data processing, such as numerous synonyms, hypernyms, multiple linguistic readings, and other
semantic information, both on queries and in the index. In addition, some of the algorithms can be super-linear, such as matching
co-references across a document. Consequently, many semantic queries can run significantly slower than the same keyword query.
Users, however, have grown to expect Web search engines to provide near-instantaneous results, and a slow search engine could
be deemed unusable even if it provides highly relevant results. It is therefore imperative for any search engine to meet its
users’ interactivity expectations, or risk losing them. Our approach to tackle this challenge is to exploit data parallelism
in slow search queries to reduce their latency in multi-core systems. Although all search engines are designed to exploit
parallelism, at the single-node level this usually translates to throughput-oriented task parallelism. This paper focuses
on the engineering of two latency-oriented approaches (coarse- and fine-grained) and compares them to the task-parallel approach.
We use Powerset’s deployed search engine to evaluate the various factors that affect parallel performance: workload, overhead,
load balancing, and resource contention. We also discuss heuristics to selectively control the degree of parallelism and consequent
overhead on a query-by-query level. Our experimental results show that using fine-grained parallelism with these dynamic heuristics
can significantly reduce query latencies compared to fixed, coarse-granularity parallelization schemes. Although these results
were obtained on, and optimized for, Powerset’s semantic search, they can be readily generalized to a wide class of inverted-index
search engines. 相似文献
5.
Iris Binyamin Eitan Grossman Matanel Gorodnitsky Doron Kam Shlomo Magdassi 《Advanced functional materials》2023,33(24):2214368
High-performance polymers are an important class of materials that are used in challenging conditions, such as in aerospace applications. Until now, 3D printing based on stereolithography processes can not be performed due to a lack of suitable materials. There is report on new materials and printing compositions that enable 3D printing of objects having extremely high thermal resistance, with Tg of 283 °C and excellent mechanical properties. The printing is performed by a low-cost Digital Light Processing printer, and the formulation is based on a dual-cure mechanism, photo, and thermal process. The main components are a molecule that has both epoxy and acrylate groups, alkylated melamine that enables a high degree of crosslinking, and a soluble precursor of silica. The resulting objects are made of hybrid materials, in which the silicon is present in the polymeric backbone and partly as silica enforcement particles. 相似文献
6.
Eitan Altman 《Discrete Event Dynamic Systems》2009,19(1):115-136
We consider in this paper a class of vector valued processes that have the form Y
n + 1 = A
n
( Y
n
) + B
n
. B
n
is assumed to be stationary ergodic and A
n
is assumed to have a divisibility property. This class includes linear stochastic difference equations as well as multi-type
branching processes (with a discrete or with a continuous state space). We derive explicit expressions for the probability
distribution as well as for the two first moments of state vectors at the stationary regime. We then apply this approach to
derive two formalisms to describe the infinite server queue. The first is based on a branching process approach adapted to
phase type service time distributions. The second is based on a linear stochastic difference equation and is adapted to independent
and generally distributed service times with bounded support. In both cases we allow for generally distributed arrival process
(not necessarily i.i.d. nor Markovian).
Eitan Altman Since 1990, Dr. Altman has been a researcher at INRIA (National research institute in informatics and control) in Sophia-Antipolis, France. He has served on the editorial boards of several scientific journals: WINET, COMNET, JDEDS, SIAM (SICON), Stochastic Models, and Journal of Economy Dynamic and Control (JEDC). Has been plenary speaker, (co)chairman of the program committee and general chair of various international conferences. Has received the best paper award in several conferences. His main interests are application of control, game theory and bio-inspired paradigms to networking. 相似文献
Eitan AltmanEmail: |
Eitan Altman Since 1990, Dr. Altman has been a researcher at INRIA (National research institute in informatics and control) in Sophia-Antipolis, France. He has served on the editorial boards of several scientific journals: WINET, COMNET, JDEDS, SIAM (SICON), Stochastic Models, and Journal of Economy Dynamic and Control (JEDC). Has been plenary speaker, (co)chairman of the program committee and general chair of various international conferences. Has received the best paper award in several conferences. His main interests are application of control, game theory and bio-inspired paradigms to networking. 相似文献
7.
As the size of High Performance Computing clusters grows, so does the probability of interconnect hot spots that degrade the latency and effective bandwidth the network provides. This paper presents a solution to this scalability problem for real life constant bisectional-bandwidth fat-tree topologies. It is shown that maximal bandwidth and cut-through latency can be achieved for MPI global collective traffic. To form such a congestion-free configuration, MPI programs should utilize collective communication, MPI-node-order should be topology aware, and the packet routing should match the MPI communication patterns. First, we show that MPI collectives can be classified into unidirectional and bidirectional shifts. Using this property, we propose a scheme for congestion-free routing of the global collectives in fully and partially populated fat trees running a single job. The no-contention result is then obtained for multiple jobs running on the same fat-tree by applying some job size and placement restrictions. Simulation results of the proposed routing, MPI-node-order and communication patterns show no contention which provides a 40% throughput improvement over previously published results for all-to-all collectives. 相似文献
8.
We present a user‐guided, semi‐automatic approach to completing large holes in a mesh. The reconstruction of the missing features in such holes is usually ambiguous. Thus, unsupervised methods may produce unsatisfactory results. To overcome this problem, we let the user indicate constraints by providing merely four points per important feature curve on the mesh. Our algorithm regards this input as an indication of an important broken feature curve. Our completion is formulated as a global energy minimization problem, with user‐defined spatial‐coherence constraints, allows for completion that adheres to the existing features. We demonstrate the method on example problems that are not handled satisfactorily by fully automatic methods. 相似文献
9.
10.
Hamidou Tembine Eitan Altman Rachid El-Azouzi Yezekael Hayel 《Telecommunication Systems》2011,47(1-2):137-152
We study in this paper some evolutionary games where competition between individuals from a large population occurs through many local interactions between randomly selected individuals. We focus on games that have the property of possessing a single interior evolutionarily stable strategy (ESS). We study in particular the effect of the time delays on the convergence of evolutionary dynamics to the ESS in an evolutionary game in which each pure strategy is associated with its own delay. In particular, we study a multiple access game as well as a Hawk and Dove game. We study the properties of the ESS in these games and also the effect of time delays on the convergence of various bio-inspired evolutionary game dynamics to the ESS. 相似文献