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Masanori Yamada Satoshi Kitamura Hideya Matsukawa Tadashi Misono Noriko Kitani Yuhei Yamauchi 《Educational technology research and development : ETR & D》2014,62(5):529-553
In recent years, collaborative filtering, a recommendation algorithm that incorporates a user’s data such as interest, has received worldwide attention as an advanced learning support system. However, accurate recommendations along with a user’s interest cannot be ideal as an effective learning environment. This study aims to develop and evaluate an online English vocabulary learning system using collaborative filtering that allows learners to learn English vocabulary while expanding their interests. The online learning environment recommends English news articles using information obtained from other users with similar interests. The learner then studies these recommended articles as a method of learning English. The results of a two-month experiment that compared this system to an earlier collaborative filtering system called “GroupLens” reveal that learners who used the collaborative filtering system developed in this study read various news articles and had significantly higher scores on topic-specific vocabulary tests than did those who used the previous system. 相似文献
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Seitaro Kumamoto Kenshiro Nakatake Souichiro Fukuyama Keiichiro Yasuda Yusuke Kitamura Masaaki Iwatsuki Hideo Baba Toshihiro Ihara Yoshitaka Nakanishi Yuta Nakashima 《Biomicrofluidics》2020,14(6)
To study an environmental or biological solution, it is essential to separate its constituents. In this study, a 3D-deformable dynamic microfilter was developed to selectively separate the target substance from a solution. This microfilter is a fine metallic nickel structure fabricated using photolithography and electroplating techniques. It is gold-coated across its entire surface with multiple slits of 10–20 μm in width. Its two-dimensional shape is deformed into a three-dimensional shape when used for fluid separation due to hydrodynamic forces. By adjusting the pressure applied to the microfilter, the size of the gap created by deformation can be changed. To effectively isolate the target substance, the relationship between the solution flow rate and the extent of microfilter deformation was investigated. The filtration experiments demonstrated the microfilter’s ability to isolate the target substance with elastic deformation without undergoing plastic deformation. Additionally, modification of the microfilter surface with nucleic acid aptamers resulted in the selective isolation of the target cell, which further demonstrates the potential application of microfilters in the isolation of specific components of heterogeneous solutions. 相似文献
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D. Brent Edwards Jr. Thomas Zimmermann Chhinh Sitha James H. Williams Yuto Kitamura 《Prospects》2014,44(3):367-380
This article has three purposes. First, it presents findings from a study of student retention and dropout in Cambodia, as pupils transition from primary to lower secondary school. Second, it aims to understand from an in-depth, emic perspective the dynamics of this process and the challenges that individual families and their students face around this transition. Third, it offers policy-relevant suggestions for addressing obstacles to students continuing in school. It meets these goals by combining complexity theory with the use of narrative research methods in interviews with student-parent pairs in urban, rural, and remote communities in Cambodia. 相似文献
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Karen E. Mulak Catherine T. Best Michael D. Tyler Christine Kitamura Julia R. Irwin 《Child development》2013,84(6):2064-2078
By 12 months, children grasp that a phonetic change to a word can change its identity (phonological distinctiveness). However, they must also grasp that some phonetic changes do not (phonological constancy). To test development of phonological constancy, sixteen 15‐month‐olds and sixteen 19‐month‐olds completed an eye‐tracking task that tracked their gaze to named versus unnamed images for familiar words spoken in their native (Australian) and an unfamiliar non‐native (Jamaican) regional accent of English. Both groups looked longer at named than unnamed images for Australian pronunciations, but only 19‐month‐olds did so for Jamaican pronunciations, indicating that phonological constancy emerges by 19 months. Vocabulary size predicted 15‐month‐olds' identifications for the Jamaican pronunciations, suggesting vocabulary growth is a viable predictor for phonological constancy development. 相似文献
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Cognitive performance and academic achievement of Japanese, Chinese, and American children 总被引：3，自引：0，他引：3
H W Stevenson J W Stigler S Y Lee G W Lucker S Kitamura C C Hsu 《Child development》1985,56(3):718-734
Chinese, Japanese, and American children at grades 1 and 5 were given a battery of 10 cognitive tasks and tests of achievement in reading and mathematics. Samples consisted of 240 children in each grade in each culture. 2 major purposes of the study were to determine possible differences in cognitive abilities of Japanese, Chinese, and American children and to investigate the possible differential relation of scores on cognitive tasks to reading by children of the 3 cultures. Similarity was found among children of the 3 cultures in level, variability, and structure of cognitive abilities. Chinese children surpassed Japanese and American children in reading scores; both Chinese and Japanese children obtained higher scores in mathematics than the American children. Prediction of achievement scores from the cognitive tasks showed few differential effects among children of the 3 cultures. The results suggest that the high achievement of Chinese and Japanese children cannot be attributed to higher intellectual abilities, but must be related to their experiences at home and at school. 相似文献
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The time frame for infants' acquisition of language constancy was probed, using the phonetic variation in a rarely heard accent (South African English) or a frequently heard accent (American English). A total of 156 Australian infants were tested. Six‐month‐olds looked longer to Australian English than less commonly heard South African accent, but at 9 months, showed similar looking times. With the more frequently heard American accent, 3‐month‐olds looked longer to Australian and American English, whereas 6‐month‐olds looked equally. Together these results imply that in the 1st year, differential attention to native versus nonnative accents decreases as infants develop a sense of language constancy for the common native language. However, experience with the nonnative accent can expedite this process. 相似文献
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David S. Crystal Chuansheng Chen rew J. Fuligni Harold W. Stevenson Chen-Chin Hsu Huei-Jen Ko Seiro Kitamura Susumu Kimura 《Child development》1994,65(3):738-753
American, 1,633 Chinese, and 1,247 Japanese eleventh-grade students, 5 indices of maladjustment included measures of stress, depressed mood, academic anxiety, aggression, and somatic complaints. Asian students reported higher levels of parental expectation and lower levels of parental satisfaction concerning academic achievement than their American peers. Nevertheless, Japanese students reported less stress, depressed mood, aggression, academic anxiety, and fewer somatic complaints than did American students. Chinese students reported less stress, academic anxiety, and aggressive feelings than their American counterparts, but did report higher frequencies of depressed mood and somatic complaints. High academic achievement as assessed by a test of mathematics was generally not associated with psychological maladjustment. The only exception was in the United States, where high achievers indicated more frequent feelings of stress than did low achievers. 相似文献
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