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Educational Psychology Review - In his 1973 article The Structure of ill structured problems, Herbert Simon proposed that solving ill-structured problems could be modeled within the same...  相似文献   
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The cadence that maximises power output developed at the crank by an individual cyclist is conventionally determined using a laboratory test. The purpose of this study was two-fold: (i) to show that such a cadence, which we call the optimal cadence, can be determined using power output, heart-rate, and cadence measured in the field and (ii) to describe methodology to do so. For an individual cyclist's sessions, power output is related to cadence and the elicited heart-rate using a non-linear regression model. Optimal cadences are found for two riders (83 and 70 revolutions per minute, respectively); these cadences are similar to the riders’ preferred cadences (82–92?rpm and 65–75?rpm). Power output reduces by approximately 6% for cadences 20?rpm above or below optimum. Our methodology can be used by a rider to determine an optimal cadence without laboratory testing intervention: the rider will need to collect power output, heart-rate, and cadence measurements from training and racing sessions over an extended period (>6 months); ride at a range of cadences within those sessions; and calculate his/her optimal cadence using the methodology described or a software tool that implements it.  相似文献   
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To better understand dimensions of text complexity and their effect on the comprehension of adolescents, 103 high school seniors were randomly assigned to 4 groups. Each group read versions of the same 2 informational passages and answered comprehension test items targeting factual recall and inferences of causal content. Group A passages had a challenging readability level and high cohesion; Group B passages had an easier readability and low cohesion; Group C passages had a challenging readability level and low cohesion; and Group D passages had an easier readability and high cohesion. Students in Group D significantly outperformed students in Group C (g = 0.78). Although the effect sizes of comparisons among all groups ranged from g = 0.13 to 0.73, no other comparisons were statistically significant. Results indicate that adolescents’ reading comprehension is dually influenced by a text's readability and cohesion. Implications for matching readers to instructional text are discussed.  相似文献   
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School results for children of poverty ‐ those forced by that poverty to live in inner‐city neighbourhoods ‐generally indicate educational failure at a much higher rate than is seen for students nurtured by wealthier school districts. This failure in school severely limits chances of social and economic upward mobility, which translates into a waste of human capital for the nation's business‐industrial‐political complex, and dashed hopes, dreams and self‐esteem for the individual. Parents and concerned citizens from across socio‐economic strata, long aware of the general inadequacy of schools in poor communities, have demanded improvement, often seeking it through legal and political means. Important strategies among the various federal, state and local school reform efforts to make schooling a meaningful process for all students, and particularly the minority poor, are decentralization and citizen/parent empowerment, the focus of this chapter. The movement to decentralize school governance ‐ an effort to place control into the hands of the people being served ‐ has gained momentum and exists in some form in most large‐city school districts today. An extension of administrative decentralization, citizen/parent empowerment is seen as one of several factors, including teacher and administrator preparation, curriculum renewal, school financing, and school restructuring, vital in the improvement of schools. A look at the meaning and scope of decentralization, operationalized through citizen/parent empowerment, and its probable effectiveness in improving school outcomes indicates that, alone, it is insufficient to ensure positive academic and social performance in school.  相似文献   
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This column reports the results of a survey conducted of medical librarian participants in medical informatics training at the University of Pittsburgh. This small study was undertaken in order to identify issues in training different kinds of library and information science practitioners in medical informatics.  相似文献   
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