Students' ability to visualize set expressions: An initial investigation     

Ted Hodgson 《Educational Studies in Mathematics》1996,30(2):159-178

Visualization is a powerful tool for understanding and solving mathematical problems. The use of Venn diagrams to visualize set expressions, however, is problematic for many students and may actually hinder their problem-solving efforts. In this study, 92 university students construct visual representations of eight set expressions. Through the use of a production system model and detailed analyses of students' work and verbal protocols, it is discovered that (1) competent and error-prone students construct and use procedures to complete set translation tasks, and (2) two-thirds of the observed errors arise from the consistent implementation of ill-formed procedures. The procedural origins of students' errors are identified and conjectures are offered regarding the perceptions and experiences that lead to the development of erroneous translation procedures.NotesThis article is based on the author's doctoral dissertation completed in 1992 at Indiana University under the direction of Frank K. Lester.  相似文献   

The impact of relational markers on expository text comprehension in L1 and L2     

Degand  Liesbeth  Sanders  Ted 《Reading and writing》2002,15(7-8):739-757

This article reports on an experimentinvestigating the impact of causal discoursemarkers (connectives and signaling phrases) onthe comprehension of expository texts in L1 andL2. Although several psycholinguistic studieshave investigated the impact of connectives andlexical markers of text structure oncomprehension (i.e. off-line), there is noconsensus on the exact effect of explicitdiscourse markers on text understanding; threedifferent findings are reported in theliterature: markers would have a facilitatingeffect, an interfering effect or no effect atall. The first goal of this article is toclarify this problem of contradicting resultsby limiting the scope of the study to causalrelations, and to one specific text type:expository texts. Furthermore, the naturalnessof the experimental texts was controlled,readers did not need specific backgroundknowledge to understand the texts and theexperimental method consisted of open answerquestioning. Our second goal is to investigateto what extent a supposed effect of linguisticmarking depends on readers proficiency in afirst or second language.The experiment consisted in the reading of short expository texts in two languages, Dutchand French, which both functioned as L1 and L2.The results indicate that readers benefit fromthe presence of causal relational markers bothin L1 and in L2. Implications for (theoriesof) text processing are discussed, as well asfor the further insights in readingcomprehension in L1 and L2.  相似文献   

Second order change: Impact of a college renewal program over time     

Joyce Povlacs Lunde  Daniel W. Wheeler  Ted E. Hartung  B. J. Wheeler 《Innovative Higher Education》1991,16(2):125-138

A structured faculty professional development program which deliberately seeks to bring about change can yield lasting benefits for both the individual and the institution. Ten individuals who entered a program for the professional renewal of faculty between 1983 and 1987 were interviewed to discover what impact the program had on their professional development and on their contributions to the institution. Their experiences exhibit external and internal changes, with individuals being able to reflect upon their gains, contributions, and future directions. A basic model for support needed to bring about lasting change includes the elements ofpower, vision, structure, andresources.Joyce P. Lunde received her Ph.D. in English from the University of Minnesota. She is an educational development specialist and associate professor of agricultural education at the University of Nebraska, Lincoln. She is currently co-director of New Partnerships in Agriculture and Education (NUPAGE), a curriculum project funded by the W.K. Kellogg Foundation.  相似文献   

In the Midst of Doubled Imaginaries: The Pacific Community as Diversity and as Difference   总被引：1，自引：0，他引：1  

Ted T. Aoki 《Interchange》1999,30(1):27-38

How shall we understand the signified "community" as in a Pacific Community? Conventional understanding of "community" privileges community understood as diversity, a collective of multiple identifiers of cultures and nations (as in multiculturalism or multinationalism). Postcolonialists, like Stuart Hall and Homi Bhabha, claim that such imaginary is inscribed in "democractic liberalism," suppressing, concealing, and containing the imaginary of "community as difference." In this article, the author calls upon readers to move boldly into the interspace midst these two imaginaries, and claims that though it is a site of ambiguity, ambivalence, and uncertainty, it may be a site of generative possibilities and hope for newness, a site of becoming in struggle.  相似文献   

Genetic etiology of spelling deficits in the Colorado and London twin studies of reading disability     

J. C. Defries  Jim Stevenson  Jacquelyn J. Gillis  Sally J. Wadsworth 《Reading and writing》1991,3(3-4):271-283

The basic multiple regression model for the analysis of selected twin data (DeFries and Fulker 1985, 1988) was fitted to spelling data from 100 pairs of MZ twins and 71 pairs of same-sex DZ twins tested in the Colorado Reading Project (DeFries, Olson, Pennington and Smith 1991), and to data from 12 pairs of MZ twins and 15 pairs of same-sex DZ twins tested in the London twin study of reading disability (Stevenson, Graham, Fredman and McLoughlin 1984, 1987). Estimates of h _g ² obtained from analyses of these data suggest that about 60% of the deficit of probands is due to heritable influences in both samples. When a regression model was fitted separately to data from males and females in the combined Colorado and London samples, resulting estimates of h _g ² were 0.66±0.18 and 0.56±0.19, respectively, a nonsignificant difference. Collaborative analyses of data from additional twin studies of reading disability would facilitate more rigorous tests of hypotheses of differential genetic etiology as a function of group membership.  相似文献   

Effect of a randomised 12-week resistance training programme on muscular strength,cross-sectional area and muscle quality in women having undergone Roux-en-Y gastric bypass     

Paul Daniels  Timothy A. Brusseau  Morgan S. Hall  Lance Davidson  Ted D. Adams 《Journal of sports sciences》2018,36(5):529-535

The purpose of this study was to examine the effect of a 12-week resistance training programme on fat-free mass (FFM), muscle cross-sectional area, muscular strength and muscle quality in women who underwent Roux-en-Y gastric bypass surgery. Participants were 16 women (mean age = 44.9 ± 10.2 years) from bariatric surgical groups who were randomly assigned into either a control or an intervention group. Air displacement plethysmography measured FFM and magnetic resonance imaging measured quadriceps muscle cross-sectional area and whole thigh muscle cross-sectional area. Muscular strength and quality was assessed using an estimated 1-Repetition Maximum assessment. All measurements were collected twice, at baseline and at a 12-week follow-up. There were significantly greater improvements in leg press strength (mean differences = 55.4%, P < 0.001, Cohen’s d = 2.4), leg extension strength (mean differences = 18.0%, P = 0.014, Cohen’s d = 0.86) and leg press muscle quality (mean differences = 54.5%, P < 0.001, Cohen’s d = 1.9) in the intervention group compared to the control group following the resistance training programme. The resistance training intervention significantly improved muscular strength and quality; however, it did not illicit changes in FFM or muscle cross-sectional area in women who underwent Roux-en-Y gastric bypass surgery.  相似文献   

The Reliability of Distance Run Tests for Children in Grades K—4     

Roberta E. Rikli  Clayre Petray  Ted A. Baumgartner 《Research quarterly for exercise and sport》2013,84(3):270-276

Abstract

The purpose of this study was to determine test–retest reliability for the 1-mile, 3/4-mile, and 1/2-mile distance run/walk tests for children in Grades K—4. Fifty-one intact physical education classes were randomly assigned to one of the three distance run conditions. A total of 1,229 (621 boys, 608 girls) complied the test–retests in the fall (October), with 1,050 of these students (543 boys, 507 girls) repeating the tests in the spring (May). Results indicated that the 1-mile run/walk distance, as recommended for young children in most national test batteries, has acceptable intraclass reliability (.83 < R < .90) for both boys and girls in Grades 3 and 4, has minimal (fall) to acceptable (spring) reliability for Grade 2 students (.70 < R < .83), but is not reliable for children in Grades K and 1 (.34 < R < .56). The 1/2 mile was the only distance meeting minimal reliability standards for boys and girls in Grades K and 1 (.73 < R < .82). Results also indicated that reliability estimates remained fairly stable across gender and age groups from the fall to spring testing periods, with the exception of the noticeably improved values for Grade 2 students on the 1-mile run/walk test. Criterion-referenced reliability (P, percent agreement) was also estimated relative to Physical Best and Fitnessgram run/walk standards. Reliability coefficients for all age group standards were acceptable to high (.70 < P < .95), except for Fitnessgram standards for 5-year-old girls on the 1-mile test for both fall and spring and for 6-year-old boys and girls on the 1-mile test administered in the spring.  相似文献   

The Impact of an Obstacle Course Sport Education Season on Students' Aerobic Fitness Levels     

Peter A. Hastie  Alice M. Buchanan  Danielle D. Wadsworth  Brandon J. Sluder 《Research quarterly for exercise and sport》2013,84(4):788-791

Abstract

The purpose of this study was to determine if factor patterns of selected sports skills were similar for two samples, a skilled sample and one consisting of a wide range of skills. Comparisons were also made with kinesiological evidence regarding the patterning of basic sports skills. Data consisting of performance scores on various sports skills were available for 166 high school girls. Out of this sample, a smaller sample was drawn consisting of 69 girls who were above average in skill. Two factor models, alpha and incomplete image analysis, were used in the analysis of this data. The factor pattern of selected sports skills performed by subjects above average in skill was similar in many respects to that of a sample which included a wide range of skill. The primary difference lay in the clustering of overarm skills which appeared in the above-average factor pattern. The overarm and push patterns of the above-average sample resembled the patterns of skill obtained through kinesiological analysis. The structure of kicking, underarm, and sidearm skills remained obscure, based on the results of factor analytic techniques.  相似文献   

Measurement Research: Where Have We Been and Where Are We Going?     

Ted A. Baumgartner 《Measurement in physical education and exercise science》2013,17(4):209-216

First, where we have been regarding measurement research will be discussed since the type, quality, and quantity of measurement research conducted in the past influences the type of measurement research which is presently conducted. Second, where we are now regarding measurement research will be discussed since the type of measurement research presently being conducted will influence the type of research which will be conducted in the future. Certainly the present status of, trends in, and needed measurement research should be identified to guide measurement researchers in deciding what measurement research to conduct. Third, where we are going regarding to measurement research will be discussed.  相似文献   

A Self‐Management Strategy for Increasing Implementation of Behavioural Procedures by Residential Staff     

Ted Glynn  Beryl Clark  Wendy Vaigro  Susie Lawless 《International Journal of Disability, Development & Education》1984,31(3):209-222

Two preliminary studies explored the use of a self‐management strategy as a component of a training program for residential Child and Family Workers. The self‐management strategy comprised the Correspondence Training procedures of Risley (1977) and the formulation of specific implementation plans (Sanders & Glynn, 1981). Experiment 1 found that prompting staff to formulate plans of how they would implement target behaviour management skills and providing individual feedback on their performance in accordance with their plans resulted in gains in implementation of target skills; no gains in implementation resulted from Instruction and Group Feedback conditions alone. This experiment examined pooled data from 18 staff collected by regular time sampled observations. Experiment 2 introduced similar procedures in a multiple baseline design to four volunteer staff, each of whom selected two target behavioural skills from the training manual. The self‐management strategy resulted in clear gains in implementation of these self‐selected target skills by all four staff. Results are discussed in terms of the potential of the correspondence training paradigm and the formulation of specific implementation plans as an approach to on‐the‐job training of residential staff.  相似文献