1,721,191 research outputs found
Modeling and tools for power supply variations analysis in networks-on-chip
No full textPower supply integrity has become a critical concern with the rapid shrinking feature size and the ever increasing power consumption in nanometre scale integration. In particular, on-chip communication in platforms such as networks-on-chip (NoC) dictates the power dissipation and overall system performance in multicore systems and embedded computing architectures. These architectures require a dedicated tool for analyzing the power supply noise which must embed distinctive communication characteristics and spatial parameters. In this paper, we present a tool dedicated to determining the on-chip VDD drops due to communication workload in NoCs. This tool integrates a fast power grid model, an NoC simulator, an on-chip link model, and a microarchitectural power model for router. The model has been rigorously verified using SPICE simulations. The proposed model and tools are further exemplified through analyzing the impact of power supply noise for NoC links. Statistical timing analysis of NoC links in the presence of power supply noise was performed to evaluate the bit error rates (BERs). This work would enable better understanding of the tradeoffs existing in the design of NoCs, and the induced power supply noise due to on-chip communication. This understanding is crucial for the analysis of the quality of service (QoS) of communication fabrics in NoCs at the early design stages
Sohini Dasgupta, Alex Yakovlev: Modeling and Performance Analysis of GALS Architectures Modeling and Performance Analysis of GALS Architectures
No full textDue to the increase in complexity of distributing a global clock over a single die globally asyn-chronous and locally synchronous systems are becoming an efficient alternative technique to design distributed SoCs. Number of independently clocked synchronous domains can be integrated by clock pausing, clock stretching or data driven clock techniques. Such techniques are applied on point-to-point inter-domain communication schemes. We present here a comparison of these schemes and how it can be applied to an exisiting partitioned synchronous architecture to obtain a reliable, low latency and efficient clock control architectures. The comparison highlights the advantages and disadvantages of one scheme over the other in terms of logical correctness, circuit implementation, performance and relative power consumption. We also present here circuit solutions for stretchable and data driven clocking schemes. These circuit solutions can be easily plugged into existing partitioned synchronous islands. To enable early evaluation of functional correct-ness, this paper proposes the use of Petri net modeling technique to model the asynchronous control blocks that constitute the interface between the synchronous islands.
Markov Decision Petri Net and Markov Decision Well-Formed Net Formalisms
No full textIn this work, we propose two high-level formalisms, Markov Decision Petri Nets (MDPNs) and Markov Decision Well-formed Nets (MDWNs), useful for the modeling and analysis of distributed systems with probabilistic and non deterministic features: these formalisms allow a high level representation of Markov Decision Processes. The main advantages of both formalisms are: a macroscopic point of view of the alternation between the probabilistic and the non deterministic behaviour of the system and a syntactical way to define the switch between the two behaviours. Furthermore, MDWNs enable the modeller to specify in a concise way similar components. We have also adapted the technique of the symbolic reachability graph, originally designed for Well-formed Nets, producing a reduced Markov decision process w.r.t. the original one, on which the analysis may be performed more efficiently. Our new formalisms and analysis methods are already implemented and partially integrated in the GreatSPN tool, so we also describe some experimental results
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe 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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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