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Efeitos de diferentes tipos e frequências de feedbacks visuais aumentados na aprendizagem dos seis fundamentos básicos do voleibol

Holderbaum, Guilherme Garcia
Fonte: Universidade Federal do Rio Grande do Sul Publicador: Universidade Federal do Rio Grande do Sul
Tipo: Tese de Doutorado Formato: application/pdf
POR
Relevância na Pesquisa
35.66%
HOLDERBAUM, G. G. Efeitos de diferentes tipos e freqüências de feedbacks visuais aumentados na aprendizagem dos seis fundamentos básicos do voleibol. Tese de Doutorado. Programa de Pós-Graduação em Ciências do Movimento Humano. Escola de Educação Física. Universidade Federal do Rio Grande do Sul, 2005. O voleibol é um dos esportes mais difundidos e praticados no mundo. No entanto, estudos que buscam o ampliar o conhecimento acerca do processo de ensino-aprendizagem dos fundamentos desta modalidade ainda são escassos. Talvez esta lacuna esteja relacionada com as dificuldades encontradas na construção de metodologias para o ensino do voleibol. Dessa forma, a utilização de feedback visual aumentado (FVA) parece ser adequada para o desenvolvimento deste esporte, uma vez que este recurso vem sendo apontado, já há algum tempo, na literatura como uma estratégia que pode influenciar o processo de ensino-aprendizagem de um gesto técnico esportivo. Tendo em vista a necessidade de novas estratégias bem como metodologias de ensino para o voleibol, o objetivo deste estudo foi verificar a influência de diferentes tipos e freqüências de FVAs no processo de ensino-aprendizagem dos seis fundamentos básicos do voleibol. Foram testados seis tipos diferentes de FVAs: (1) FVA-D (demonstrativo); (2) FVA-C (comparativo); (3) FVA-DI (demonstrativo com informações); (4) FVA-CI (comparativo com informações); (5) FVA-DIC (demonstrativo com informações e confirmação) e FVA-CIC (comparativo com informações e confirmação) combinados com quatro freqüências de fornecimento destes feedbacks: F50% (feedback a cada duas tentativas); F33% (feedback a cada três tentativas); F20% (feedback a cada cinco tentativas) e Fredu (feedback a F50% no 1º e 2º dias; a F33% no 3º e 4º dias e a F20% no quinto dia de prática). Participaram deste estudo 300 sujeitos de ambos os sexos...

Strategies of plasmid DNA production and their influence on therapeutic applications

Silva, Filomena Augusta Almeida e
Fonte: Universidade da Beira Interior Publicador: Universidade da Beira Interior
Tipo: Tese de Doutorado
Publicado em //2011 ENG
Relevância na Pesquisa
35.55%
Current developments in gene therapy and DNA vaccination, plasmid DNA vectors are becoming increasingly appealing as therapeutics towards a large number of diseases such as cancer, infectious and cardiovascular diseases. This popularity is creating the demand for high quantities of highly purified plasmid DNA which in turn requires the design of high pDNA yield bioprocesses. However, opposed to recombinant protein production, research on pDNA production is still needed, in order to have a clear comprehension of all the challenges and bottlenecks faced during the production of plasmid DNA (pDNA). The design of a plasmid DNA production process usually begins with the choice of a suitable culture medium to cultivate the expression system containing the therapeutic plasmid. After defining all medium components, the influence of culture conditions, such as pH, temperature and dissolved oxygen, on biomass and plasmid yields is generally studied. Since the appropriate conditions for maximizing biomass production and plasmid replication are not usually the same, a compromise solution is usually considered in these cases. When designing a large scale plasmid DNA production process, the employment of a correct fermentation strategy is also necessary in order to improve yields while reducing production costs. So far...

ADHD and EEG-neurofeedback: a double-blind randomized placebo-controlled feasibility study

Lansbergen, M. M.; van Dongen-Boomsma, M.; Buitelaar, J. K.; Slaats-Willemse, D.
Fonte: Springer Vienna Publicador: Springer Vienna
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
35.55%
Electroencephalography (EEG)-neurofeedback has been shown to offer therapeutic benefits to patients with attention-deficit/hyperactivity disorder (ADHD) in several, mostly uncontrolled studies. This pilot study is designed to test the feasibility and safety of using a double-blind placebo feedback-controlled design and to explore the initial efficacy of individualized EEG-neurofeedback training in children with ADHD. Fourteen children (8–15 years) with ADHD defined according to the DSM-IV-TR criteria were randomly allocated to 30 sessions of EEG-neurofeedback (n = 8) or placebo feedback (n = 6). Safety measures (adverse events and sleep problems), ADHD symptoms and global improvement were monitored. With respect to feasibility, all children completed the study and attended all study visits and training sessions. No significant adverse effects or sleep problems were reported. Regarding the expectancy, 75% of children and their parent(s) in the active neurofeedback group and 50% of children and their parent(s) in the placebo feedback group thought they received placebo feedback training. Analyses revealed significant improvements of ADHD symptoms over time, but changes were similar for both groups. This pilot study shows that it is feasible to conduct a rigorous placebo-controlled trial to investigate the efficacy of neurofeedback training in children with ADHD. However...

Neuronal activity during a cued strategy task: Comparison of dorsolateral, orbital and polar prefrontal cortex

Tsujimoto, Satoshi; Genovesio, Aldo; Wise, Steven P.
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em 08/08/2012 EN
Relevância na Pesquisa
35.67%
We compared neuronal activity in the dorsolateral (PFdl), orbital (PFo) and polar (PFp) prefrontal cortex as monkeys performed three tasks. In two tasks, a cue instructed one of two strategies: stay with the previous response or shift to the alternative. Visual stimuli served as cues in one of these tasks; in the other, fluid rewards did so. In the third task, visuospatial cues instructed each response. A delay period followed each cue. As reported previously, PFdl encoded strategies (stay or shift) and responses (left or right) during the cue and delay periods, while PFo encoded strategies and PFp encoded neither strategies nor responses; during the feedback period, all three areas encoded responses, not strategies. Four novel findings emerged from the present analysis. (1) The strategy encoded by PFdl and PFo cells during the cue and delay periods was modality specific. (2) The response encoded by PFdl cells was task- and modality specific during the cue period, but during the delay and feedback periods it became task- and modality general. (3) Although some PFdl and PFo cells responded to or anticipated rewards, we could rule out reward effects for most strategy-and response-related activity. (4) Immediately before feedback, only PFp signaled responses that were correct according to the cued strategy; after feedback...

Systems Pharmacological Analysis of Paclitaxel-Mediated Tumor Priming That Enhances Nanocarrier Deposition and Efficacy

Ait-Oudhia, Sihem; Straubinger, Robert M.; Mager, Donald E.
Fonte: The American Society for Pharmacology and Experimental Therapeutics Publicador: The American Society for Pharmacology and Experimental Therapeutics
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
45.49%
Paclitaxel (PAC)-mediated apoptosis decompresses and primes tumors for enhanced deposition of nanoparticulate agents such as pegylated liposomal doxorubicin (DXR). A quantitative pharmacokinetic/pharmacodynamic (PK/PD) approach was developed to analyze efficacy and identify optima for PAC combined with sterically stabilized liposome (SSL)-DXR. Using data extracted from diverse literature sources, Cremophor-paclitaxel (Taxol®) PK was described by a carrier-mediated dispositional model and SSL-DXR PK was described by a two-compartment model with first-order drug release. A hybrid-physiologic, well-stirred model with partition coefficients (Kp) captured intratumor concentrations. Apoptotic responses driving tumor priming were modeled using nonlinear, time-dependent transduction functions. The tumor growth model used net first-order growth and death rate constants, and two transit compartments that captured the temporal displacement of tumor exposure versus effect, and apoptotic signals from each agent were used to drive cytotoxic effects of the combination. The final model captured plasma and intratumor PK data, apoptosis induction profiles, and tumor growth for all treatments/sequences. A feedback loop representing PAC-induced apoptosis effects on Kp_DXR enabled the model to capture tumor-priming effects. Simulations to explore time- and sequence-dependent effects of priming indicated that PAC priming increased Kp_DXR 3-fold. The intratumor concentrations producing maximal and half-maximal effects were 18 and 7.2 μg/ml for PAC...

Holistic face perception in young and older adults: effects of feedback and attentional demand

Meinhardt-Injac, Bozana; Persike, Malte; Meinhardt, Günter
Fonte: Frontiers Media S.A. Publicador: Frontiers Media S.A.
Tipo: Artigo de Revista Científica
Publicado em 22/10/2014 EN
Relevância na Pesquisa
35.75%
Evidence exists for age-related decline in face cognition ability. However, the extents to which attentional demand and flexibility to adapt viewing strategies contribute to age-related decline in face cognition tests is poorly understood. Here, we studied holistic face perception in older (age range 65–78 years, mean age 69.9) and young adults (age range 20–32 years, mean age 23.1) using the complete design for a sequential study-test composite face task (Richler et al., 2008b). Attentional demand was varied using trials that required participants to attend to both face halves and to redirect attention to one face half during the test (high attentional demand), and trials that allowed participants to keep a pre-adjusted focus (low attentional demand). We also varied viewing time and provided trial-by-trial feedback or no feedback. We observed strong composite effects, which were larger for the elderly in all conditions, independent of viewing time. Composite effects were smaller for low attentional demand, and larger for high attentional demand. No age-related differences were found in this respect. Feedback also reduced the composite effects in both age groups. Young adults could benefit from feedback in conditions with low and high attentional demands. Older adults performed better with feedback only in trials with low attentional demand. When attentional demand was high...

Behavioral Economics: “Nudging” Underserved Populations to Be Screened for Cancer

Purnell, Jason Q.; Thompson, Tess; Kreuter, Matthew W.; McBride, Timothy D.
Fonte: Centers for Disease Control and Prevention Publicador: Centers for Disease Control and Prevention
Tipo: Artigo de Revista Científica
Publicado em 15/01/2015 EN
Relevância na Pesquisa
45.41%
Persistent disparities in cancer screening by race/ethnicity and socioeconomic status require innovative prevention tools and techniques. Behavioral economics provides tools to potentially reduce disparities by informing strategies and systems to increase prevention of breast, cervical, and colorectal cancers. With an emphasis on the predictable, but sometimes flawed, mental shortcuts (heuristics) people use to make decisions, behavioral economics offers insights that practitioners can use to enhance evidence-based cancer screening interventions that rely on judgments about the probability of developing and detecting cancer, decisions about competing screening options, and the optimal presentation of complex choices (choice architecture). In the area of judgment, we describe ways practitioners can use the availability and representativeness of heuristics and the tendency toward unrealistic optimism to increase perceptions of risk and highlight benefits of screening. We describe how several behavioral economic principles involved in decision-making can influence screening attitudes, including how framing and context effects can be manipulated to highlight personally salient features of cancer screening tests. Finally, we offer suggestions about ways practitioners can apply principles related to choice architecture to health care systems in which cancer screening takes place. These recommendations include the use of incentives to increase screening...

Interventions designed to improve the quality and efficiency of medication use in managed care: A critical review of the literature – 2001–2007

Pearson, Sallie-Anne; Lu, Christine Y.; Ross-Degnan, Dennis; Soumerai, Stephen Bertram
Fonte: BioMed Central Publicador: BioMed Central
Tipo: Artigo de Revista Científica
EN_US
Relevância na Pesquisa
35.63%
Background: Managed care organizations use a variety of strategies to reduce the cost and improve the quality of medication use. The effectiveness of such policies is not well understood. The objective of this research was to update a previous systematic review of interventions, published between 1966 and 2001, to improve the quality and efficiency of medication use in the US managed care setting. Methods: We searched MEDLINE and EMBASE for publications from July 2001 to January 2007 describing interventions targeting drug use conducted in the US managed care setting. We categorized studies by intervention type and adequacy of research design using commonly accepted criteria. We summarized the outcomes of well-controlled strategies and documented the significance and magnitude of effects for key study outcomes. Results: We identified 164 papers published during the six-year period. Predominant strategies were: educational interventions (n = 20, including dissemination of educational materials, and group or one-to-one educational outreach); monitoring and feedback (n = 22, including audit/feedback and computerized monitoring); formulary interventions (n = 66, including tiered formulary and patient copayment); collaborative care involving pharmacists (n = 15); and disease management with pharmacotherapy as a primary focus (n = 41...

The Impact of Macroeconomic Policies on Poverty and Income Distribution : Macro-Micro Evaluation Techniques and Tools

Bourguignon, François; Bussolo, Maurizio; Pereira da Silva, Luiz A.
Fonte: Washington, DC : World Bank and Palgrave Macmillan Publicador: Washington, DC : World Bank and Palgrave Macmillan
EN_US
Relevância na Pesquisa
45.47%
This book assembles methodologies and techniques to evaluate the poverty impact of macroeconomic policies. It takes as a departure point a companion volume, the impact of economic policies on poverty and income distribution: evaluation techniques and tools. This volume was primarily a review of microeconomic techniques aimed at assessing policies that are directly concerned with the welfare of poor households or individuals such as changing the level of cash transfers to the poorest households, increasing price subsidies for basic consumer goods, and the like. In addition, the second part of that earlier publication introduced basic techniques to deal with the poverty impact of macroeconomic policies that by definition are not targeted and affect the whole population. This volume presents a comprehensive array of macro-micro modeling frameworks. It begins by highlighting the limitation of macroeconomic models that use representative household groups to link macroeconomic policies and microeconomic data. It then moves to more complexes...

The effects of a General Instructional Strategies course on the utilization of effective instructional strategies by teachers

Orihuela, Lawrence R
Fonte: FIU Digital Commons Publicador: FIU Digital Commons
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
35.57%
The focus of this study was to explain the extent to which theoretically effective teaching strategies taught in a course on generic instructional strategies are being implemented by teachers in their actual teaching practice. ^ A multivariate causal-comparative (ex-post-facto) design was used to answer the research question. A teacher observation protocol, the General Instructional Strategies Analysis (GISA) was constructed and used to assess the utilization of instructional strategies in the classroom. The data of this study also included open-ended field notes taken during observations. ^ Multivariate Analyses of Variance (MANOVA) was used to compare the teaching strategies (set, effective explanation, hands-on activity, cooperative learning activity, higher order questioning, closure) of the group who had taken a general instructional strategies course (N=36) and the group who had not (N=36). Results showed a statistically significant difference between the two groups. The group who had taken the course implemented these strategies more effectively in almost all categories of effective teaching. Follow-up univariate tests of the dependent variables showed significant differences between the two groups in five of the six areas (hands-on activity being an exception). A second MANOVA compared the two groups on the effective use of attending behaviors (teacher movement/eye contact/body language/physical space...

Comparative efficacies of decision strategies and the effects of learning in dynamic environments: a computer simulation approach

Rutledge, Spencer, III
Fonte: Monterey, California. Naval Postgraduate School Publicador: Monterey, California. Naval Postgraduate School
Tipo: Tese de Doutorado
EN_US
Relevância na Pesquisa
45.72%
Approved for public release; distribution is unlimited.; Models of aggregation in management science and economics are not consistent with micro-empirical knowledge of individual decision making. This has occurred as a result of using heuristics that are derived from behavioral studies which focused on discrete incidents. This approach fails to recognize decision making as a continuous process and overlooks the importance of feedback. This study examines the performance of various decision strategies (heuristics) in dynamic environments through computer simulation. Within dynamic task environments, three classes of strategies are examined: (a) feedback oriented strategies, (b) non-feedback oriented strategies and; (c) a strategy that incorporates learning. The relative efficacies of these strategies are compared. The results show that feedback oriented strategies achieved a higher level of performance than non-feedback oriented strategies. And the strategy that incorporated learning outperformed all other strategies. A few anomalies exist and may require additional sampling. The implications of these findings for command decision making indicate that, feedback from prior military actions can play an important role in adapting existing systems to meets new military roles in changing environments.

O feedback dos professores e o envolvimento dos alunos na escola : um estudo com alunos do 9º ano

Avões, Patrícia Marques
Fonte: Universidade de Lisboa Publicador: Universidade de Lisboa
Tipo: Dissertação de Mestrado
Publicado em //2015 POR
Relevância na Pesquisa
35.61%
Dissertação de Mestrado, Educação (Área de especialização em Formação Pessoal e Social), Universidade de Lisboa, Instituto de Educação, 2015; O feedback dado pelos professores às produções dos alunos é conside-rado por diversos autores como uma influência poderosa no modo como os alu-nos aprendem. Atendendo a que se tem verificado um interesse crescente na temática do envolvimento dos alunos nas escolas, uma vez que este é tido como uma solução para os baixos desempenhos académicos e para o abandono esco-lar que afetam muitas escolas, delineou-se o presente estudo para estudar os efeitos de um programa de intervenção, na área do feedback do professor, no envolvimento dos alunos. Deste modo, o presente estudo tem como objetivo averiguar se o uso de feedback escrito e eficaz promove o envolvimento dos alunos na escola e com-preender os progressos gerados quando os alunos estão sujeitos a um feedback intencional e sistemático do professor. A amostra era constituída por 91 sujeitos do nono ano de escolaridade, em contexto de sala de aula, na disciplina de Geografia, numa escola de Ensino Privado de Lisboa. A metodologia adotada foi um desenho quasi-experimental, com um gru-po de controlo e um grupo experimental...

An examination of the effects of locus of control on perceptions of core job dimensions and job satisfaction

Tieche, Lois E.
Fonte: Brock University Publicador: Brock University
Tipo: Electronic Thesis or Dissertation
ENG
Relevância na Pesquisa
35.57%
This study examined the moderating effects of locus of control on core job dimensions (skill variety, task identity, task significance, autonomy, feedback) and job satisfaction. Survey data were collected from 1995 educators in Southern Ontario. When core job dimensions were perceived to be high, job satisfaction scores were high. The converse relationship was also true; when core job dimensions were perceived to be low, job satisfaction scores were also low. As well, the investigation explored the effect of educators' locus of control of reinforcement on the relationship between core job dimensions and job satisfaction. Internals (N = 483-486) perceived more skill variety, more task identity, more task significance, more autonomy, more feedback and greater job satisfaction than externals (N = 626-629). However, contrary to expectation, the correlations between specific core job dimensions namely autonomy and feedback, were not systematically greater for internals compared to externals. In addition the findings reported here suggest some appropriate directions and strategies for measuring and increasing job satisfaction among teachers.

Feedback in Teaching Practice: A Workshop for Teachers; Feedback en la Práctica Docente: Un Curso de Formación para el Profesorado; Feedback na prática letiva: Uma oficina de formação de professores

Fonseca, Jesuína; Universidade de Lisboa; Carvalho, Carolina; Universidade de Lisboa; Conboy, Joseph; Universidade de Lisboa; Salema, Helena; Universidade de Lisboa; Valente, Maria Odete; Universidade de Lisboa; Gama, Ana Paula; Instituto Superior D. Afo
Fonte: Instituto de Educação da Universidade do Minho Publicador: Instituto de Educação da Universidade do Minho
Tipo: info:eu-repo/semantics/article; article; info:eu-repo/semantics/publishedVersion Formato: application/pdf
Publicado em 30/06/2015 POR
Relevância na Pesquisa
95.8%
The use of feedback in the classroom can promote the quality of teacher student relationships, student academic involvement and achievement, eventhough teachers may not always use it in the best way. In this article we describe the development and evaluation of a workshop designed to enhance teacher knowledge and skills in the use of feedback strategies. Twelve teachers participated in the workshop. Reports and reflections of teachers reveal that participation in the workshop potentiated greater awareness and more appropriate use of feedback strategies. A long-term workshop, that integrates specific objectives related to feedback strategies and reflection sessions interspersed with application work in the classroom, can promote participants’ involvement, knowledge and skills in the use of these strategies.It can also result in greater involvement and learning by these teachers’students. Keywords: Teacher education; Teacher feedback; Feedback strategies and effects;Workshop; El uso del feedback en el aula puede promover la calidad de las relaciones profesor-alumno, la participación académica y el rendimiento del alumnado,aunque los docentes no siempre lo usan de la mejor manera. En este artículo se describe el desarrollo y la evaluación de un curso diseñado para mejorarlos conocimientos y capacidades de los docentes en el uso de estrategias de feedback...

Political sustainability in the vision for space exploration : articulating the policy-technology feedback cycle

Broniatowski, David André, 1982-
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 154 p.; 10018489 bytes; 10027135 bytes; application/pdf; application/pdf
ENG
Relevância na Pesquisa
45.49%
It is often difficult to forecast the future budgetary environment for today's space systems. Indeed, multiple NASA missions and programs have been put into jeopardy or canceled outright, due to discrepancies between the expected and actual lifecycle costs. This has resulted in the loss of billions of dollars in taxpayer money spent on false starts. It is therefore in the best interests of all stakeholders, including NASA and the U.S. Congress, to arrive at a solution which will allow NASA's space exploration endeavors to be funded at a politically sustainable level. Understanding the mechanisms and processes by which a program may exhibit politically sustainability is of paramount importance to the space exploration enterprise. In particular, budgetary sustainability has proven to be a driver for The President's Vision for Space Exploration, which instructs NASA to "Implement a sustained and affordable" space exploration program. NASA, as a federal agency, is dependent upon the support of many stakeholders within the US political system, especially the President and members of Congress. Thus, a politically sustainable program must address the needs of these stakeholders.; (cont.) Based upon strategies for agency-Congress interaction that are derived from the existing political science literature...

Undesirable side-effects of water hyacinth control in a shallow tropical reservoir

Bicudo, Denise de Campos; Fonseca, Barbara Medeiros; Bini, Luís M.; Crossetti, Luciane O.; Bicudo, Carlos Eduardo de Mattos; Araujo-Jesus, Tatiane
Fonte: Universidade Católica de Brasília Publicador: Universidade Católica de Brasília
Tipo: Artigo de Revista Científica Formato: Texto
EN
Relevância na Pesquisa
35.59%
1. Based on a comprehensive data set collected monthly during 8 years (1997–2004), we evaluated the effects of mechanical removal of Eichhornia crassipes on the limnological characteristics and algal biomass of a polymictic shallow tropical reservoir. 2. Interrupted time series analyses indicated that the limnological responses to macrophyte removal can be classified as an ‘abrupt permanent impact’ implying that the overall mean of the time-series shifted promptly after intervention. These analyses indicated a significant increase for pH, total phosphorus, total phytoplankton and cyanobacterial biomass, and a decrease in water transparency and CO2 concentrations in the surface water; also, the increase in water stability, increase of bottom soluble reactive phosphorus (SRP) and decrease in bottom oxygen levels. 3. Cyclic anoxic periods previously observed during springs and summers were replaced by a persistent period of anoxic conditions in the sediment overlying water. Anoxic conditions were suitable for SRP release from sediments. Heavy cyanobacterial blooms became more persistent, maximum biomass (4229 mm3 L−1) was 30 times larger, the blooms frequently reached 2 m and sometimes the bottom of the reservoir, contrasting to the preremoval period in which it reached at most 1 m deep. 4. The long-term P dynamics in the system...

Prediction feedback in intelligent traffic systems

Chuan-Fei, Dong; Xu, Ma; Guan-Wen, Wang; Xiao-Yan, Sun; Bing-Hong, Wang
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 28/09/2009
Relevância na Pesquisa
45.58%
The optimal information feedback has a significant effect on many socioeconomic systems like stock market and traffic systems aiming to make full use of resources. In this paper, we studied dynamics of traffic flow with real-time information provided and the influence of a feedback strategy named prediction feedback strategy is introduced, based on a two-route scenario in which dynamic information can be generated and displayed on the board to guide road users to make a choice. Our model incorporates the effects of adaptability into the cellular automaton models of traffic flow and simulation results adopting this optimal information feedback strategy have demonstrated high efficiency in controlling spatial distribution of traffic patterns compared with the other three information feedback strategies, i.e., vehicle number and flux.; Comment: 14 pages, 15 figures

Effects of Prediction Feedback in Multi-Route Intelligent Traffic Systems

Dong, Chuanfei; Ma, Xu; Wang, Binghong; Sun, Xiaoyan
Fonte: Universidade Cornell Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
45.61%
We first study the influence of an efficient feedback strategy named prediction feedback strategy (PFS) based on a multi-route scenario in which dynamic information can be generated and displayed on the board to guide road users to make a choice. In this scenario, our model incorporates the effects of adaptability into the cellular automaton models of traffic flow. Simulation results adopting this optimal information feedback strategy have demonstrated high efficiency in controlling spatial distribution of traffic patterns compared with the other three information feedback strategies, i.e., vehicle number and flux. At the end of this paper, we also discuss in what situation PFS will become invalid in multi-route systems.; Comment: 15 pages, 15 figures, Physica A (2010), doi:10.1016/j.physa.2010.02.036

The Efficacy of Various Kinds of Error Feedback for Improvement in the Writing Accuracy of Iranian EFL Learners

Ashoori Tootkaboni, Arezoo; Khatib, Mohammad
Fonte: Universidade Autônoma de Barcelona Publicador: Universidade Autônoma de Barcelona
Tipo: Artigo de Revista Científica Formato: application/pdf
Publicado em //2014 ENG
Relevância na Pesquisa
45.74%
The present study was an attempt to delve further into the effects of different corrective feedback strategies on enhancing learners’ writing accuracy both short and long term. To fulfill the purpose of the study, three classes comprising 67 female students in the context of a public high school in Astara, Iran, were randomly assigned to one of the three conditions; direct feedback with teacher-student 5 minute individual conference; indirect coded feedback and no-feedback. A pre-test ensured that learners are homogeneous regarding their previous grammatical knowledge. The study lasted for 5 weeks. There were immediate and delayed posttests to measure the writing accuracy of learners both short and long term. The results of the short-term test showed the significant superiority of direct feedback in the teacher-student individual conference group over the other groups. In contrast, the learners in the indirect coded feedback group were slightly better than the group that received instruction through direct and teacher-student conference feedback. This suggests that it is beneficial to make use of direct corrective feedback strategies when the short period mastery of the linguistic structures is needed and indirect corrective strategies are proposed when long-term mastery of the grammatical knowledge is the purpose of the educational intervention.; La présente étude visait à approfondir les effets de différentes stratégies de rétroaction corrective sur l'amélioration de la précision de l'écriture des apprenants à la fois en court et à long terme. Pour atteindre l'objectif de l'étude...

Pricing and hedging of derivative securities: Some effects of asymmetric information and market power.

Stremme, Alexander
Fonte: London School of Economics and Political Science Thesis Publicador: London School of Economics and Political Science Thesis
Tipo: Thesis; NonPeerReviewed Formato: application/pdf
Publicado em //1999 EN
Relevância na Pesquisa
35.56%
This thesis consists of a collection of studies investigating various aspects of the interplay between the markets for derivative securities and their respective underlying assets in the presence of market imperfections. The classic theory of derivative pricing and hedging hinges on three rather unrealistic assumptions regarding the market for the underlying asset. Markets are assumed to be perfectly elastic, complete and frictionless. This thesis studies some effects of relaxing one or more of these assumptions. Chapter 1 provides an introduction to the thesis, details the structure of what follows, and gives a selective review of the relevant literature. Chapter 2 focuses on the effects that the implementation of hedging strategies has on equilibrium asset prices when markets are imperfectly elastic. The results show that the feedback effect caused by such hedging strategies generates excess volatility of equilibrium asset prices, thus violating the very assumptions from which these strategies are derived. However, it is shown that hedging is nonetheless possible, albeit at a slightly higher price. In Chapter 3, a model is developed which describes equilibrium asset prices when market participants use technical trading rules. The results confirm that technical trading leads to the emergence of speculative price "bubbles". However...