Evaluation of retirement planning programs: A qualitative analysis of methodologies and efficacy     

Cristineide Leandro-França  Sheila Giardini Murta  Douglas A. Hershey  Leonardo Barbosa Martins 《Educational gerontology》2013,39(7):497-512

ABSTRACT

The objective of this integrative literature review was to evaluate the quality of retirement planning programs described in the extant literature. This was accomplished through a qualitative analysis of methodological and efficacy criteria as described by Flay et al. (2005), Kazdin (2010, 2011 and Murta (2005). Several databases were consulted in searching for retirement program articles including: Academic Search Premier, Medline, PsycInfo, and Web of Science, among others. Retirement planning intervention articles published in English, Portuguese, and Spanish were considered, with a focus on their evaluation methods and results. Eleven studies were identified that described the procedures for both program implementation and intervention evaluation. Results revealed methodological shortcomings in the papers reviewed, with concerns being related to a lack of experimental or quasiexperimental approaches, a failure to use previously validated measurement instruments and longitudinal assessments, and insufficiently robust data analysis procedures. That said, however, there was evidence from multiple investigations that the intervention programs examined led to increases in knowledge, positive changes in attitudes linked to retirement, and an increase in retirement-linked planning and preparation behaviors. Identification of strengths and weaknesses in the methods used and efficacy of these interventions could facilitate the construction of a research agenda aimed at promoting more favorable research designs. Use of more rigorous designs would stand to improve the internal validity of these retirement programs and, consequently, progress in this field.  相似文献   

Cognitive Processes,ICT, and Education: A Critical Analysis     

Manuel Ferraz Lorenzo  Cristian Machado Trujillo 《学校用计算机》2013,30(3):186-203

Information and communication technologies (ICT) have brought about renewed spaces for the societies of today, full of possibility and transformation. Bordering on the infinite, these spaces have generated new activities and behaviors. This technological scenario is now commonplace, an everyday reality that has taken root in our lives with remarkable speed. Now would therefore be an appropriate time to open up a line of inquiry into how this is shaping educational practice and how it is affecting our cognitive structures. We have chosen to conduct a review of relevant literature that will enable us to adopt a critical analysis to our subject: education and, above all, the learner, seen from the perspective of neuroscience and social analysis. However, the principal aim of this paper is to lay bare the disparities between research findings and current educational practices that use ICT.  相似文献   

Coherence estimate between a random and a periodic signal: Bias, variance, analytical critical values, and normalizing transforms     

Antonio Mauricio F.L. Miranda de S  Danton D. Ferreira  Edson W. Dias  Eduardo M.A.M. Mendes  Leonardo B. Felix 《Journal of The Franklin Institute》2009,346(9):841-853

The present work deals with recent results on the sampling distribution of the magnitude-squared coherence (also called just coherence) estimate between a random (Gaussian) and a periodic signal, in order to obtain analytical critical values, alternative expressions for the probability density function (PDF) as well as the variance and bias of the estimate. A comparison with the more general case of coherence estimation when both signals are Gaussian was also provided. The results indicate that the smaller the true coherence (TC) values the closer both distributions become. The behaviour of variance and bias as a function of the number of data segments and the TC is similar for both coherence estimates. Additionally, the effect of a normalizing function (Fisher's z transform) in the coherence estimated between a random and a periodic signal was also evaluated and normality has been nearly achieved. However, the variance was less equalized in comparison with coherence estimate between two Gaussian signals.  相似文献   

Using genetic algorithms to evolve a population of topical queries   总被引：1，自引：1，他引：0  

Rocío L. Cecchini  Carlos M. Lorenzetti  Ana G. Maguitman  Nlida Beatríz Brignole 《Information processing & management》2008,44(6):1863

Systems for searching the Web based on thematic contexts can be built on top of a conventional search engine and benefit from the huge amount of content as well as from the functionality available through the search engine interface. The quality of the material collected by such systems is highly dependant on the vocabulary used to generate the search queries. In this scenario, selecting good query terms can be seen as an optimization problem where the objective function to be optimized is based on the effectiveness of a query to retrieve relevant material. Some characteristics of this optimization problem are: (1) the high-dimensionality of the search space, where candidate solutions are queries and each term corresponds to a different dimension, (2) the existence of acceptable suboptimal solutions, (3) the possibility of finding multiple solutions, and in many cases (4) the quest for novelty. This article describes optimization techniques based on Genetic Algorithms to evolve “good query terms” in the context of a given topic. The proposed techniques place emphasis on searching for novel material that is related to the search context. We discuss the use of a mutation pool to allow the generation of queries with new terms, study the effect of different mutation rates on the exploration of query-space, and discuss the use of a especially developed fitness function that favors the construction of queries containing novel but related terms.  相似文献   

Biomechanical analyses of synchronised swimming standard and contra-standard sculling     

Lara Elena Gomes  Vera Diogo  Flávio Antônio de Souza Castro  João Paulo Vilas-Boas  Ricardo J. Fernandes  Pedro Figueiredo 《Sports biomechanics / International Society of Biomechanics in Sports》2019,18(4):354-365

Synchronised swimming involves a variety of sculling movements essential for body support and propulsion but its study is scarce. We aimed to biomechanically compare standard and contra-standard sculling techniques, and to observe the relationship between measures. Six synchronised swimmers performed two, 30 s maximal intensity, fully tethered standard and contra-standard sculling motions. Kinetic and kinematic data were obtained using a load-cell and underwater cameras, respectively. Force decreased along both techniques’ bouts, but no differences in-between techniques were noted for any kinetic variables. Standard sculling presented a higher cycle rate and a lower elbow mean angle than the contra-standard sculling (2.4 ± 0.3 vs. 2.0 ± 0.2 cycles/s and 134.1 ± 5.8 and 141.5 ± 4.7°, p < 0.05). In the standard sculling, by removing and maintaining the variation between participants (r _w and r, respectively), the absolute mean force was directly related with cycle rate (r _w  = 0.60) and wrist angular velocity during flexion (r = 0.82), while in the contra-standard condition the force was inversely associated with wrist mean angle (r = ?0.95) and directly with hand speed (r _w  = 0.76), and elbow angular velocity (r _w  ≈ 0.60). Therefore, technique learning and training require different attention by coaches and swimmers.  相似文献   

Player migration in Portuguese football: a game of exits and entrances     

Carlos Nolasco 《Soccer & Society》2019,20(6):795-809

In a context of intense competition, emphasized by globalization processes, the football industry seeks to maximize performances through an incessant search for high quality skilled players. In a market logic, these players become a scarce asset. They are intensely sought out by teams, which results in an intense migration flow of footballers. Portuguese football is also imbedded in these migrations dynamics. Although it is not a new phenomenon in recent years, Portugal has become a crossroads of migratory flows players, with a large number of foreign players to reach national clubs, and many Portuguese players to go to foreign clubs. The aim of this paper is to observe the migratory trends of football players in Portugal, and identify the migratory routes not only of the foreign players who arrived in Portugal, but also of the Portuguese players who go abroad.  相似文献   

Acute effects of aerobic exercise performed with different volumes on strength performance and neuromuscular parameters     

Natalia Ribeiro  Carlos Ugrinowitsch  Valéria Leme Gonçalves Panissa  Valmor Tricoli 《European Journal of Sport Science》2019,19(3):287-294

The aim of the present study was to investigate the acute effect of the aerobic exercise volume on maximum strength and strength-endurance performance; and possible causes of strength decrements (i.e. central and peripheral fatigue). Twenty-one moderately trained men were submitted to a maximal incremental test to determine anaerobic threshold (AnT) and maximum dynamic strength (1RM) and strength-endurance (i.e. total volume load [TV]) tests to determine their baseline strength performance. Following, subjects performed six experimental sessions: aerobic exercise sessions (continuous running at 90% AnT) with different volumes (3?km, 5?km or 7?km) followed by 1RM or strength-endurance test in the 45° leg press exercise. Maximum voluntary isometric contraction (MVIC), voluntary activation (VA) level, contractile properties, and electromyographic activity (root mean square [RMS]) of the knee extensor muscles were assessed before and after aerobic exercises and after strength tests. TV was lower after 5?km and 7?km runs than in the control condition (12% and 22%, respectively). Additionally, TV was lower after 7?km than 3?km (14%) and 5?km (12%) runs. MVIC, VA, RMS, and contractile properties were reduced after all aerobic exercise volumes (～8%, ～5%, ～11% and ～6–14%, respectively). Additionally, MVIC, VA, and contractile properties were lower after strength tests (～15%, ～6%, ～9–26%, respectively). In conclusion, strength-endurance performance is impaired when performed after aerobic exercise and the magnitude of this interference is dependent on the aerobic exercise volume; and peripheral and central fatigue indices could not explain the different TV observed.  相似文献   

Towards a new cosmopolitan social contract: social trends and political challenges     

Sousa  João Carlos 《Metascience》2020,29(3):493-496

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Editorial     

Juan Carlos Tedesco 《Prospects》1996,26(4):625-628

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Ranking dynamics and volatility     

Carlos Garcia-Zorita  Ronald Rousseau  Sergio Marugan-Lazaro  Elias Sanz-Casado 《Journal of Informetrics》2018,12(3):567-578

Scientific journals are ordered by their impact factor while countries, institutions or researchers can be ranked by their scientific production, impact or by other simple or composite indicators as in the case of university rankings. In this paper, the theoretical framework proposed in Criado, R., Garcia, E., Pedroche, F. & Romance, M. (2013). A new method for comparing rankings through complex networks: Model and analysis of competitiveness of major European soccer leagues. Chaos, 23, 043114 for football competitions is used as a starting point to define a general index describing the dynamics or its opposite, stability, of rankings. Some characteristics to study rankings, ranking dynamics measures and axioms for such indices are presented. Furthermore, the notion of volatility of elements in rankings is introduced. Our study includes rankings with ties, entrants and leavers. Finally, some worked out examples are shown.  相似文献