1,721,227 research outputs found
NAQPMS-PDAF v2.0
No full text<p>NAQPMS-PDAF v2.0 is an online-coupled hybrid nonlinear chemical data assimilation system that can accurately interpret aerosols and their chemical components (such as sulfate, nitrite, ammonium, organic carbon, and elemental carbon). NAQPMS-PDAF v2.0 mainly consists of a chemistry transport model (NAQPMS) and an open-access parallel data assimilation framework (PDAF, https://pdaf.awi.de/trac/wiki). Source code provides the core routines in NAQPMS-PDAF v2.0.</p><p>File description</p>
<p>a. naqpms-pdaf v2.0.rar contains the core routines in NAQPMS-PDAF v2.0.</p>
<p>b. naqpms-pdaf v2.0 output.zip provides the chemical component assimilation output by NAQPMS-PDAF v2.0.</p>
<p>c. reanalysis data.zip provides the global reanalysis data (CAMSRA and MERRA-2) and NAQPMS-PDAF v1.0 output.</p>
<p>d. observations.zip provides chemical component observations at 33 sites.</p>
<p>e. samples.zip provides the statistical results of assimilation experiments.</p>
Output-feedback-based H∞ control for vehicle suspension systems with control delay
No full textThis paper deals with the problem of output-feedback H∞ control for a class of active quarter-car suspension systems with control delay. The dynamic system of the suspension systems is first formed in terms of the control objectives, i.e., ride comfort, road holding, suspension deflection, and maximum actuator control force. Then, the objective is to the design of the dynamic output-feedback H∞ controller in order to ensure asymptotic stability of the closed-loop system with H∞ disturbance attenuation level and the output constraints. Furthermore, using Lyapnov theory and linear matrix inequality (LMI) approach, the existence of admissible controllers is formulated in terms of LMIs. With these satisfied conditions, a desired dynamic output-feedback controller can be readily constructed. Finally, a quarter-vehicle model is exploited to demonstrate the effectiveness of the proposed method. © 1982-2012 IEEE
Optimal control of discrete-time interval type-2 fuzzy-model-based systems with D-stability constraint and control saturation
Full text linkThis paper investigates the optimal control problem for discrete-time interval type-2 (IT2) fuzzy systems with pole constraints. An IT2 fuzzy controller is characterized by two predefined functions, and the membership functions and the premise rules of the IT2 fuzzy controller can be chosen freely. The pole assignment is considered, which is constrained in a presented disk region. Based on Lyapunov stability theory, sufficient conditions of asymptotic stability with an H∞ performance are obtained for the discrete-time IT2 fuzzy model based (FMB) system. Based on the criterion, the desired IT2 state-feedback controller is designed to guarantee that the closed-loop system is asymptotically stable with a prescribed H∞ performance condition and all the poles rest in the disk region. Finally, two numerical examples are shown to illustrate the effectiveness of the presented design scheme
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
Can the world cut poverty in half ? how policy reform and effective aid can meet international development goals
Full text linkMore effective development aid could greatly improve poverty reduction in the areas where poverty reduction is expected to lag: Sub-Saharan Africa, Eastern Europe, and Central Asia. Even more potent would be significant policy reform in the countries themselves. The authors develop a model of efficient aid in which the total volume of aid is endogenous. In particular, aid flows respond to policy improvements that create a better environment for poverty reduction and effective use of aid. They use the model to investigate scenarios-of policy reform, of more efficient aid, and of greater volumes of aid-that point the way to how the world could cut poverty in half in every major region. The fact that aid increases the benefits of reform suggests that a high level of aid to strong reformers may increase the likelihood of sustained good policy (an idea ratified in several recent case studies of low-income reformers). The authors find that the world is not operating on the efficiency frontier. With the same level of concern, much more poverty reduction could be achieved by allocating aid on the basis of how poor countries are as well as on the basis of the quality of their policies. Global poverty reduction requires a partnership in which"third world"countries and governments improve economic policy while"first world"citizens and governments show concern about poverty and translate that concern into effective assistance.Poverty Monitoring&Analysis,Services&Transfers to Poor,Poverty Reduction Strategies,Environmental Economics&Policies,Health Economics&Finance,Achieving Shared Growth,Environmental Economics&Policies,Poverty Monitoring&Analysis,Services&Transfers to Poor,Poverty Assessment
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
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