On Grandmother Neurons and Grandfather Clocks     

David Perkins 《Mind, Brain, and Education》2009,3(3):170-175

What does contemporary neuroscience offer educational practice? The promise seems immense, as we come to understand better how the brain learns. However, critics caution that only a few concrete implications for practice have emerged, nowhere near a rewrite of the craft of teaching and learning. How then can we understand better the relationship between neuroscience and educational practice? It is argued here that to speak to the classroom neuroscience has to shout across two gaps. The first and most familiar are different levels of explanation. The second concerns the epistemological contrast between explanation theories and action theories, roughly the contrast between basic science on the one hand and engineering science and craft on the other. Just as we do not expect Newton's laws in their fundamental generality to deliver specific designs for pocket watches and grandfather clocks, neither should we expect fundamental neuroscience to radically redesign particular practices of teaching and learning grounded in educational research and experience.  相似文献   

Eigentaste: A Constant Time Collaborative Filtering Algorithm   总被引：32，自引：2，他引：30  

Ken Goldberg  Theresa Roeder  Dhruv Gupta  Chris Perkins 《Information Retrieval》2001,4(2):133-151

Eigentaste is a collaborative filtering algorithm that uses universal queries to elicit real-valued user ratings on a common set of items and applies principal component analysis (PCA) to the resulting dense subset of the ratings matrix. PCA facilitates dimensionality reduction for offline clustering of users and rapid computation of recommendations. For a database of n users, standard nearest-neighbor techniques require O(n) processing time to compute recommendations, whereas Eigentaste requires O(1) (constant) time. We compare Eigentaste to alternative algorithms using data from Jester, an online joke recommending system.Jester has collected approximately 2,500,000 ratings from 57,000 users. We use the Normalized Mean Absolute Error (NMAE) measure to compare performance of different algorithms. In the Appendix we use Uniform and Normal distribution models to derive analytic estimates of NMAE when predictions are random. On the Jester dataset, Eigentaste computes recommendations two orders of magnitude faster with no loss of accuracy. Jester is online at: http://eigentaste.berkeley.edu  相似文献   

关于德性与德行的一种思考   总被引：1，自引：0，他引：1  

萨·巴特尔 《北京师范大学学报(社会科学版)》2007,(5):96-101

在中西方伦理思想中,德性与德行是一对既有联系又有区别的重要概念。然而,自古以来中西方伦理学界对德性与德行的具体使用及其相互关系的理解却始终存在着很大的差异。西方传统伦理学家们一般用"德性"这个概念,到了亚里士多德那里才出现了"理智德性"和"道德德性"等说法。而中国传统伦理学家们一般则用"德"这个概念,但也出现了"德性"和"德行"等说法并存的现象。名词术语上的这种差别不是没有原因的,它集中体现着中西方伦理思维方式的根本性问题。在西方传统伦理学家的逻辑里面,"德性"(理智德性)是人及其实现活动的终极目的本身,"德行"(道德德性)则只是完成这种人及其实现活动的一种过程和手段而已。在中国传统伦理学家的逻辑里面,"德"或"德性"(理智德性)只是人及其实现活动的一种过程或手段;而"德行"(道德德性)才是人及其实现活动的目的本身。一个人只知道"德性"不等于他有道德;同样,一个人也不是先成为道德的人然后再去做有"德行"的活动。"德性"是人的内在品质;而"德行"则是人的外在品行。内在品质要通过外在品行来表现;外在品行是内在品质的影像。因此,人们获得德性与德行的具体途径是不同的。我们只有在理论上弄清楚德性与德行的联系及区别,才能够充分认识和找到获得德性与德行的具体途径。  相似文献   

Strange Necklace     

Mekkin S. Perkins 《The Educational forum》2013,77(4)

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Eminent chemists of our time: By Benjamin Harrow,Ph.D. Second edition,enlarged. xx-471 pages,illustrated, 8vo. New York,D. Van Nostrand Company,Inc., 1927. Price, $3     

George Wesley Perkins 《Journal of The Franklin Institute》1927,204(2):279

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Career Development Strategies and Experiences of “Outsiders Within” in Academe     

Kecia M. Thomas  Dan A. Mack  Kimberly L. Williams  Lesley A. Perkins 《Journal of Career Development》1999,26(1):51-67

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Quantitative understanding of the fly casting stroke through measurements and robotic casting   总被引：1，自引：1，他引：0  

D. Anderson  N. C. Perkins  B. Richards 《Sports Engineering》2006,9(2):97-106

A stumbling point for many learning to fly fish is being able to fly cast well enough to ‘present’ a fly to a feeding fish. Even among more skilled fly fishers, learning to fly cast better is often a bottleneck towards advancement in the sport. Fly casting instruction today relies on the visual inspection of the fly casting stroke and the resulting ‘loop’ of fly line. These qualitative visual cues help fly casting instructors spot the strengths and weakness in a student’s casting stroke. We introduce two novel technologies for fly casting instruction that result in aquantitative understanding of the fly casting stroke. In particular, we describe a novel robot that is able to replicate standard overhead casts. This achievement is made possible by measuring the casting stroke using a small (MEMS) rate gyro to record the angular velocity of the fly rod in the casting plane. The robot is then programmed to replicate this angular velocity history. Potential uses of this robot include an objective means to assess fly rod, fly line and leader designs, as well as new methods for fly casting instruction.  相似文献   

Educational Journals: Should They Be More Practical?     

Richard W. Perkins 《Clearing house (Menasha, Wis.)》2013,86(4)

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Winter's Last Fling     

Mekkin S. Perkins 《The Educational forum》2013,77(3)

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Collections heritage commitee     

John Perkins 《Archives and Museum Informatics》1995,9(1):54-58

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