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Desing and Real-Time Analysis of a Direct Current Motor Controller Dise o y análisis de tiempo real de un controlador para motor de corriente directa
Reinier Torres Labrada,Mailén Sarmiento Fong
Revista Cubana de Ingeniería , 2011, DOI: 10.1234/rci.v2i3.55
Abstract: The real time analysis of a DC motor controller is addressed. During the functional analysis, deadline and period of tasks were extracted to be used as parameters for Response Time Analysis (RTA). To get the Worst Case Execution Time (WCET) each task is stimulated with a random input vector. A great number of computation time samples were recorded and the WCET computed using the Gumbel statistical distribution. With the WCET, deadlines and periods of the task set under analysis a RTA model is evaluated and its results discussed. By modeling the WCET using the Extreme Values Theory (EVT) the need of low level analysis for software and an accurate model for hardware is avoided. The method used here is useful for soft real-time systems and could be applied to other hw/sw platforms easily. Se presenta el análisis de tiempo real para un controlador de motores de corriente directa (CD). Durante el análisis funcional se obtuvieron los plazos y períodos de las tareas, cuyos valores son utilizados posteriormente como parámetros en el análisis de tiempo de respuesta (ATR). Para obtener el caso peor de tiempo de ejecución (CPTE) el sistema es estimulado con un vector aleatorio de entrada para las tareas analizadas, se mide el tiempo de computación para un número grande de iteraciones y se realiza el modelado con el uso de la distribución de probabilidad de Gumbel. Con los resultados obtenidos para el CPTE y los parámetros del conjunto de tareas que se obtuvieron durante el análisis funcional, se evalúa un modelo de ATR y sus resultados son discutidos. Al modelar el CPTE mediante la teoría de valores extremos (TVE) se evita el análisis del software a bajo nivel y la necesidad de un modelo preciso para el hardware. Este método es útil para el análisis de sistemas de tiempo real blandos y puede ser fácilmente aplicado a otras plataformas de desarrollo hardware/software.
Conservación de cepas vacunales de Leptospira en nitrógeno líquido
Borrero Maura,Reinier; Batista Santiesteban,Niurka; Blain Torres,Kirenia; Valdés Abreu,Yolanda;
Revista Cubana de Medicina Tropical , 2010,
Abstract: introduction: leptospira interrogans strains of cuban vaccine vax-spiral?are preserved in fletcher's semi-solid medium, which guarantees the preservation of the cell viability for a few months. objective: to evaluate the cryopreservation at liquid nitrogen of 6 different cryoprotectors as a long-term preservation method for leptospira interrogans strains used as antigens in vaccine vax-spiral? against leptospirosis. methods: viability was systematically evaluated according to the cell yield of the recently thawed strains in emjh medium. virulence stability was estimated in hamsters and antigenicity was evaluated by microscopic agglutination test using reference antisera from vaccinal serogroups. results: the use of 2.5% and 5% dimethyl sulfoxide, and 2.5% glycerol allowed quick recovery of the three strains without virulence or antigenicity depletion after 19 months of cryopreservation. conclusions: the results showed the feasibility of the cryopreservation at liquid nitrogen using suitable cryoprotectant as a preservation method for vaccinal strains of leptospira.
Conservación de cepas vacunales de Leptospira en nitrógeno líquido Preservation for vaccinal strains of Leptospira at liquid nitrogen
Reinier Borrero Maura,Niurka Batista Santiesteban,Kirenia Blain Torres,Yolanda Valdés Abreu
Revista Cubana de Medicina Tropical , 2010,
Abstract: INTRODUCCIóN: las cepas de Leptospira interrogans que integran la vacuna cubana vax-SPIRAL son conservadas en medio semisólido de Fletcher, el cual garantiza el mantenimiento de la viabilidad de las células por pocos meses. OBJETIVO: en este estudio, se evaluó la crioconservación en nitrógeno líquido de 6 variantes de crioprotectores como método de conservación a largo plazo de las cepas de Leptospira interrogans, utilizadas como antígenos en la vacuna antileptospirósica vax-SPIRAL . MéTODOS: la viabilidad se evaluó periódicamente según el rendimiento celular alcanzado por las cepas recién descongeladas en medio EMJH. La estabilidad de la virulencia fue estimada en hámster. La antigenicidad antes y después de la crioconservación fue comparada mediante microaglutinación, frente a una batería de antisueros de referencia correspondientes a los serogrupos vacunales. RESULTADOS: solo el empleo de dimetilsulfóxido a 2,5 y 5 %, y glicerol 2,5 % como agentes crioprotectores permitió una rápida recuperación de las 3 cepas, tras 19 meses de crioconservación sin afectación de su virulencia y antigenicidad. CONCLUSIONES: los resultados obtenidos demuestran la factibilidad de la crioconservación en nitrógeno líquido con un apropiado agente crioprotector, como método de conservación de cepas vacunales de Leptospira. INTRODUCTION: Leptospira interrogans strains of Cuban vaccine vax-SPIRAL are preserved in Fletcher's semi-solid medium, which guarantees the preservation of the cell viability for a few months. OBJECTIVE: to evaluate the cryopreservation at liquid nitrogen of 6 different cryoprotectors as a long-term preservation method for Leptospira interrogans strains used as antigens in vaccine vax-SPIRAL against leptospirosis. METHODS: viability was systematically evaluated according to the cell yield of the recently thawed strains in EMJH medium. Virulence stability was estimated in hamsters and antigenicity was evaluated by microscopic agglutination test using reference antisera from vaccinal serogroups. RESULTS: the use of 2.5% and 5% dimethyl sulfoxide, and 2.5% glycerol allowed quick recovery of the three strains without virulence or antigenicity depletion after 19 months of cryopreservation. CONCLUSIONS: the results showed the feasibility of the cryopreservation at liquid nitrogen using suitable cryoprotectant as a preservation method for vaccinal strains of Leptospira.
As tentativas dos cognitivistas pioneiros
Rozestraten, Reinier Johannes Antonius;
Estudos de Psicologia (Natal) , 2004, DOI: 10.1590/S1413-294X2004000100002
Abstract: this paper intends to offer more exact information about oswald külpe and his application of the experimental method on cognitive processes. how do we think? are perceptive images always necessary to create our thinking? what is the speed of our thinking and how do we solve problems? with the support of his students - several of them were to be eminent psychologists - he improved the methods of observation and the analysis of the results. before joining definitively psychology, for a long time he was divided between history and psychology and even using experimental methods considered psychology as belonging to the area of philosophy. in his conference of 1912, he presented as a synthesis the existence of imageless thinking, the central role of the ego in thinking activity and the dominant tendency of the thinking task in problem solving. after würzburg the schools of colonia, mannheim and amsterdam continued the studies with new approaches for deaf-mute children education, discovering levels of conscience and the application of the new concepts about thinking and problem solving in primary school teaching. it was mainly this last point that was further developed by kohnstamm emphasizing the practices of silent reading as a method to reach the full development of intellectual capacities of children.
Evolu??o inicial dos estudos da inteligência do idoso: mitos e fatos
Rozestraten, Reinier Johannes Antonius;
Paidéia (Ribeir?o Preto) , 2002, DOI: 10.1590/S0103-863X2002000200011
Abstract: this paper presents the beginning and the first development of studies about the intelligence of the aged within the frame of the five phases of behavior psychogenesis: information intake, information processing, decision making, response-behavior and feedback. in the course of this evolution that starts at the end of world war i, three myths emerged that successively were refuted: a) the myth that intelligence is a unique massive capacity instead of a joint of several capacities which may combine in multiple forms; b) the myth that this unique intelligence in its totality deteriorates during old age, but later was verified that only some capacities named "fluid intelligence" are affected meanwhile others characterized as "crystallized intelligence" are constant or even improved; e c) the old age factor is the unique factor that influences the development or deterioration of intellectual capacities. to this last myth lehr asserts that there are at least more nine influencing factors: decline of the g factor , speed, innate aptitude, educational level, training, stimulating environment, health, successful life and motivation.
Novos caminhos para a psicologia do transito
Reinier Johannes Antonius Rozestraten
Psicologia: Ciência e Profiss?o , 2000, DOI: 10.1590/s1414-98932000000400009
Abstract: Pretendemos nestertigo fornecer algumas informa es a respeito do 37o Congresso de Psicologia de Transito em Braunschweig (Alemanha) em setembro de 1998. Alguns pontos importantes foram: a presen a maci a de psicólogos de sexo masculino, mais ou menos 4/5, o caráter interdisciplinar, a extens o para todas as modalidades de transito , o elevado número de professores universitários apresentando trabalhos, a apresenta o de um bom número de novos testes, especialmente o modelo multiteste por computador acoplado a simulador pelo VerkehrsKuratorium de Viena, a ênfase sobre a terapia comportamental para condutores com follow-up de vários anos, a apresenta o de psicologia de transito por Internet e a insistência nos meios para conseguir uso mais intensivo do transporte coletivo bem como a educa o para condutores agressivos e estressados. Além disto, chamou a aten o o excelente material didático do Centro Educacional de Transito da próprias cidade de Braunschweig. Merece men o que também Alemanha ganhou seu novo Código de Transito em dezembro de 1997. This paper pretends to provide some informations about the 37th Congress of Traffic Psychology at Braunschweig - Germany - September 1998. Some important points were: the massive presence of male psychologists, about 4/5, the interdisciplinar trend, the treatment of all modalities of traffic and transport, the high number of university professors presenting papers, the presentation of various new driver-tests particularly a multitest computer aided model with simulation by the Wiener VerkehrsKuratorium, emphasis on behavior psychotherapy for drivers, with a follow-up of several years, the presentation of traffic psychology on Internet, insistence on strategies to extend the use of public transport, and education for agressive and stressed drivers. Besides these Congress subjects the fine educational editions of the Traffic Education Center for the city of Braunschweig merits full attention. It was mentioned also that Germany received its new Traffic Code December 1997.
A Psicologia Social e o transito
Reinier J. A. Rozestraten
Psicologia: Ciência e Profiss?o , 1986, DOI: 10.1590/s1414-98931986000200007
Abstract:
Population-specific limited sampling strategies for therapeutic drug monitoring of mycophenolic acid
van Hest Reinier
Journal of Postgraduate Medicine , 2006,
Abstract:
Constructing elliptic curves in almost polynomial time
Reinier Broker,Peter Stevenhagen
Mathematics , 2005,
Abstract: We present an algorithm that, on input of a positive integer N together with its prime factorization, constructs a finite field F and an elliptic curve E over F for which E(F) has order N. Although it is unproved that this can be done for all N, a heuristic analysis shows that the algorithm has an expected run time that is polynomial in 2^omega(N) log N, where omega(N) is the number of distinct prime factors of N. In the cryptographically relevant case where N is prime, an expected run time O((log N)^{4+epsilon}) can be achieved. We illustrate the efficiency of the algorithm by constructing elliptic curves with point groups of order N=10^2004 and N=nextprime(10^{2004})=10^{2004}+4863.
Constructing elliptic curves of prime order
Reinier Broker,Peter Stevenhagen
Mathematics , 2007,
Abstract: We present a very efficient algorithm to construct an elliptic curve E and a finite field F such that the order of the point group E(F) is a given prime number N. Heuristically, this algorithm only takes polynomial time Otilde((\log N)^3), and it is so fast that it may profitably be used to tackle the related problem of finding elliptic curves with point groups of prime order of prescribed size. We also discuss the impact of the use of high level modular functions to reduce the run time by large constant factors and show that recent gonality bounds for modular curves imply limits on the time reduction that can be obtained.
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