Modular model predictive control upon an existing controller

The availability of predictions of future system inputs has motivated research into preview control to improve set-point tracking and disturbance rejection beyond that achievable via conventional feedback control. The design of preview controllers, typically based upon model predictive control (MPC) for its constraint handling properties, is often performed in a monolithic nature, coupling the feedback and feed-forward problems. This can create problems, such as: (i) an additional feedback loop is introduced by MPC, which alters the closed-loop dynamics of the existing feedback compensator, potentially resulting in a deterioration of the nominal sensitivities and robustness properties of an existing closed-loop and (ii) the default preview action from MPC can be poor, degrading the original feedback control performance. In our previous work, the former problem is addressed by presenting a modular MPC design on top of a given output-feedback controller, which retains the nominal closed-loop robustness and frequency-domain properties of the latter, despite the addition of the preview design. In this paper, we address the second problem; the preview compensator design in the modular MPC formulation. Specifically, we derive the key conditions that ensure, under a given closed-loop tuning, the preview compensator within the modular MPC formulation is systematic and well-designed in a sense that the preview control actions complement the existing feedback control law rather than opposing it. In addition, we also derive some important results, showing that the modular MPC can be implemented in a cascade over any given linear controllers and the proposed conditions hold, regardless of the observer design for the modular MPC. The key benefit of the modular MPC is that the preview control with constraint handling can be implemented without replacing the existing feedback controller. This is illustrated through some numerical examples

A gest?o da Informa??o e do conhecimento em bibliotecas universit?rias: estudo de caso da Biblioteca UFJF/GV da Universidade Federal de Juiz de Fora ? campus avan?ado Governador Valadares

Esta pesquisa pretende trazer ? luz e cooperar com o desenvolvimento da tem?tica Gest?o da Informa??o e do Conhecimento em Bibliotecas Universit?rias P?blicas. O estudo tem como l?cus de pesquisa a Biblioteca UFJF/GV da Universidade Federal de Juiz de Fora ? campus avan?ado Governador Valadares (UFJF/GV). Em face disto, o problema de pesquisa indaga quais os limites e possibilidades da aplicabilidade da Gest?o da Informa??o e do Conhecimento pela Biblioteca UFJF/GV e de seu ?rg?o coordenador, o Centro de Difus?o do Conhecimento (CDC) no desenvolvimento de produtos e servi?os ofertados ? comunidade acad?mica. Tem como objetivo analisar os limites e possibilidades da aplicabilidade da GIC pela Biblioteca UFJF/GV e de seu ?rg?o coordenador, o Centro de Difus?o do Conhecimento (CDC) na conjuntura da administra??o de bibliotecas. Os aspectos investigados referem-se ? an?lise das concep??es, estrat?gias e efeitos do uso de instrumentos de GIC como subs?dio ? gest?o de produtos e servi?os bibliotecon?micos. A orienta??o metodol?gica apoia-se na obra de Gil (2017) e classifica-se como emp?rica e social. O problema de pesquisa delineia-se sob o modelo de estudo de caso do tipo ?nico, com enfoque incorporado, nos moldes de Yin (2001). O trabalho apresenta-se, quanto aos objetivos, do tipo explorat?rio-descritivo e com abordagem qualitativa. A natureza das fontes examinadas ? bibliogr?fica e documental. Quanto ? interpreta??o dos dados obtidos, as categorias anal?ticas estabelecem-se em face do Ciclo do Conhecimento Organizacional modelado por Choo (2011). Como m?todos de aprecia??o dos dados s?o aplicados as t?cnicas de an?lise de conte?do, formulado por Bardin (2016), e triangula??o de dados, de Miles e Huberman (1984). A relev?ncia da pesquisa e do problema investigado vincula-se ao aperfei?oamento das pr?ticas da Administra??o p?blica, em especial, daquelas orientadas para o ensino superior. Quanto aos aspectos contribuintes ? teoria, relacionam-se nesta pesquisa, a generaliza??o natural?stica, a gera??o de sentido e o incremento te?rico. No tocante aos resultados da investiga??o, reconhece-se que a GIC n?o se consolidou por completo na UFJF e em seu campus avan?ado. N?o obstante a isto, percebe-se que as ideias e a??es propostas pelas teorias de aprendizagem organizacional foram traduzidas em diversos momentos nas pr?ticas organizacionais da UFJF/GV, em especial, na Biblioteca UFJF/GV. Apreende-se que as cria??es de significados para os agentes organizacionais da Biblioteca UFJF/GV demandaram maior flexibilidade nos processos representativos da informa??o gerencial , assim como ? oportuna a continuidade de implementa??o de TIC?s nos demais ?rg?os da UFJF e do CDC. Como perspectivas futuras, entende-se que a incorpora??o de uma postura administrativa e indutiva, voltada aos princ?pios de propaga??o do conhecimento registrado devem ser cada vez mais conduzidos pelos bibliotec?rios e gestores do sistema CDC. Depreende-se tamb?m sobre a indispensabilidade da cria??o de um estudo de usu?rios institucionalizado que possibilite a prospec??o das necessidades dos utentes da Biblioteca UFJF/GV e dos indicadores concernentes aos produtos e servi?os ofertados pela UFJF/GV.Disserta??o (Mestrado Profissional) ? Programa de P?s-Gradua??o em Educa??o, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2018.This research aims to bring to light and cooperate with the development of the Information and Knowledge Management in Public University Libraries. The study has as a research locus the UFJF / GV Library of the Federal University of Juiz de Fora - Governador Valadares Advanced Campus (UFJF / GV). In the face of this, the research problem investigates the limits and possibilities of the applicability of Information and Knowledge Management by the UFJF / GV Library and its coordinating body, the Knowledge Diffusion Center (CDC) in the development of products and services offered to the academic community. It aims to analyze the limits and possibilities of the applicability of GIC by the UFJF / GV Library and its coordinating body, the Knowledge Diffusion Center (CDC) in the context of library administration. The aspects investigated refer to the analysis of conceptions, strategies and effects of the use of GIC instruments as a subsidy to the management of library products and services. The methodological orientation is based on the work of Gil (2017) and is classified as empirical and social. The research problem is outlined under the single-case study model with a built-in approach, following the model of Yin (2001). The work presents, as far as the objectives, the exploratory-descriptive type and with qualitative approach. The nature of the sources examined is bibliographical and documentary. As for the interpretation of the data obtained, the analytical categories are established in the face of the Organizational Knowledge Cycle modeled by Choo (2011). As methods of data appreciation are applied the techniques of content analysis, formulated by Bardin (2016), and triangulation of data, Miles and Huberman (1984). The relevance of the research and of the investigated problem is related to the improvement of public administration practices, especially those oriented toward higher education. As for the contributing aspects to the theory, naturalistic generalization, the generation of meaning and the theoretical increase are related in this research. Regarding the results of the investigation, it is recognized that GIC has not fully consolidated in the UFJF and in its advanced campus. In spite of this, we can see that the ideas and actions proposed by organizational learning theories were translated into several moments in the UFJF/GV organizational practices, especially in the UFJF/GV Library. It is understood that the creations of meanings for the organizational agents of the UFJF/GV Library demanded greater flexibility in the representative processes of managerial information, as well as the continuity of the implementation of ICTs in the other organs of the UFJF and the CDC. As future perspectives, it is understood that the incorporation of an administrative and inductive posture, oriented to the principles of propagation of registered knowledge should be increasingly conducted by the librarians and managers of the CDC system. It is also evident that the creation of an institutionalized user study that enables the prospection of users of the UFJF/GV Library and of the indicators concerning the products and services offered by UFJF/GV is indispensable

Selfishness, altruism and message spreading in mobile social networks

Many kinds of communication networks, in particular social and opportunistic networks, rely at least partly on on humans to help move data across the network. Human altruistic behavior is an important factor determining the feasibility of such a system. In this paper, we study the impact of different distributions of altruism on the throughput and delay of mobile social communication system. We evaluate the system performance using four experimental human mobility traces with uniform and community-biased traffic patterns. We found that mobile social networks are very robust to the distributions of altruism due to the nature of multiple paths. We further confirm the results by simulations on two popular social network models. To the best of our knowledge, this is the first complete study of the impact of altruism on mobile social networks, including the impact of topologies and traffic patterns.published_or_final_versio

Quadratic BSDEs with convex generators and unbounded terminal conditions

In a previous work, we proved an existence result for BSDEs with quadratic generators with respect to the variable z and with unbounded terminal conditions. However, no uniqueness result was stated in that work. The main goal of this paper is to fill this gap. In order to obtain a comparison theorem for this kind of BSDEs, we assume that the generator is convex with respect to the variable z. Under this assumption of convexity, we are also able to prove a stability result in the spirit of the a priori estimates stated in the article of N. El Karoui, S. Peng and M.-C. Quenez. With these tools in hands, we can derive the nonlinear Feynman--Kac formula in this context

Back-translation for discovering distant protein homologies

Frameshift mutations in protein-coding DNA sequences produce a drastic change in the resulting protein sequence, which prevents classic protein alignment methods from revealing the proteins' common origin. Moreover, when a large number of substitutions are additionally involved in the divergence, the homology detection becomes difficult even at the DNA level. To cope with this situation, we propose a novel method to infer distant homology relations of two proteins, that accounts for frameshift and point mutations that may have affected the coding sequences. We design a dynamic programming alignment algorithm over memory-efficient graph representations of the complete set of putative DNA sequences of each protein, with the goal of determining the two putative DNA sequences which have the best scoring alignment under a powerful scoring system designed to reflect the most probable evolutionary process. This allows us to uncover evolutionary information that is not captured by traditional alignment methods, which is confirmed by biologically significant examples.Comment: The 9th International Workshop in Algorithms in Bioinformatics (WABI), Philadelphia : \'Etats-Unis d'Am\'erique (2009