Solving Hitchcock''s transportation problem by a genetic algorithm     

CHEN Hai-feng  CHO Joong Rae  LEE Jeong.Tae 《重庆大学学报(英文版)》2004,3(2)

Genetic algorithms (GAs) employ the evolutionary process of Darwin's nature selection theory to find the solutions of optimization problems. In this paper, an implementation of genetic algorithm is put forward to solve a classical transportation problem, namely the Hitchcock's Transportation Problem (HTP), and the GA is improved to search for all optimal solutions and identify them automatically. The algorithm is coded with C and validated by numerical examples. The computational results show that the algorithm is efficient for solving the Hitchcock's transportation problem.  相似文献   

The gene craze     

Goodell R 《哥伦比亚新闻学评论》1980,19(4):41-45

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Communing with Nature: The Collective Journey of Yatoo Artists and its Pedagogical Potentials     

Kyong‐Mi Paek 《The International Journal of Art & Design Education》2019,38(1):240-255

Increasing concern over environmental sustainability and socioecological well‐being has motivated people to consider ways to reconnect humans with the natural world through lifestyle changes that integrate well with natural systems. Educators who share environmental concerns have explored diverse aspects of ecological art practices to envision an extended and socially relevant role of art. Accordingly, the present study aims to bring educators’ attention to a collective journey of artists who have immersed themselves in making an affective relationships with nature. Regarding the journey as an invaluable cultural resource that holds the potential to extend the horizon of how we may live with nature, it examines the collective journey of the artists in Yatoo, an artist association based in Gongju, a greenery city in the southwest region of South Korea. The guiding questions set for the contextual analysis are: ‘how do Yatoo artists become native to their place?’ and ‘what can be learned from their collective journey?’. First, the collective journey of the artists is examined based on four major factors: regionality, positioning, methodology and networking. This is followed by discussions focusing on the value of the collective identity shaped by bioregionally conscious art practices and the pedagogical potentials arising from the collective journey. This paper suggests that the collective journey of Yatoo's life‐sustaining practice, operating in an era of environmental crisis, contributes to the recently developing alternative pedagogical discussions by opening up dialogues that navigate ways to encourage more sustainable practices for the future.  相似文献   

Opportunities and Challenges in Collaborative Reform Practice: School–Community Partnerships through Art in Korean Schools     

Kyong‐Mi Paek 《The International Journal of Art & Design Education》2020,39(3):509-522

The Korean government’s policy toward art in schools and educational autonomy has recently undergone major directional changes, with the Ministry of Education (MOE) encouraging individual schools to find their own ways to become more self‐regenerating, especially by developing community partnerships through art. This recently published policy direction has the potential to challenge traditional school practice as it demands an initiative role of schools and the active involvement of teachers in building partnerships with local communities. Concerned about the impact of the new school art policy on practice, this article attempts to clarify the opportunities and challenges involved in the expected collaborative reform practice by examining the outcomes reported by pilot schools based on their first year of implementing the new school art policy. To this end, this article first identifies the distinctive aspects of the new policy from previous studies on school–community partnerships developed in Korea over the past decade. This is followed by an identification of practical issues and needs by reviewing the outcomes of recent survey results on the perceptions of teachers who participated in conventional school–community partnership programmes. These results will be compared to the problems found in the outcomes reported by pilot schools. Findings will be discussed to assess implications and provide suggestions. This contextual analysis of practitioners’ responses to new art‐based collaborative reform practices developing in Korea may contribute to an expansion of international discussions about educational reform through art.  相似文献   

Quiet times: Poetry in motion     

Rae Pica 《Early Childhood Education Journal》1987,14(4):32-35

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Practice,learning and change: practice-theory perspectives on professional learning     

Bill Green  John Rae 《Studies in Continuing Education》2016,38(2):259-263

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“Can I do well in mathematics reasoning?” Comparing US and Finnish students’ attitude and reasoning via TIMSS 2011     

Jihyun Hwang  Cristina Runnalls  Sneha Bhansali  Khajidsuren Navaandamba  Kyong Mi Choi 《Educational Research and Evaluation》2017,23(7-8):328-348

This study investigated differences between the US and Finland in terms of how students’ attitude is related to mathematical reasoning skills through the Trends in International Mathematics and Science Study (TIMSS) 2011. Attitude towards mathematics was observed via 3 TIMSS contextual variables: liking mathematics, valuing mathematics, and confidence in mathematics. Scores for mathematical reasoning were collected from the TIMSS 2011 database. We used hierarchical linear modelling to construct multilevel models with interactions of the attitude variables. Findings showed that confidence in mathematics had the strongest positive relationships with mathematical reasoning in both countries. Finnish students generally reported stronger positive relationships between confidence in mathematics and reasoning than US students. Strong relationships between confidence and reasoning remained visible when examining valuing and liking mathematics. Findings provide important implications regarding the complex interactions between attitude towards mathematics and reasoning, critical for mathematics educators and policymakers to consider in an increasingly competitive international environment.  相似文献   

Environmental control of morphine tolerance in the hamster     

Paul Schnur  Rae Ann Martinez 《Learning & behavior》1989,17(3):322-327

Tolerance to morphine-induced hypoactivity in hamsters was investigated under conditions designed to test a Pavlovian conditioning model of morphine tolerance. One group of animals received i.p. injections of morphine (50 mg/kg) in the test environment and saline in the home cage; a second group received saline in the test environment and morphine in the home cage; a third group received saline in both environments. A subsequent morphine challenge in the test environment gave evidence of both associative and nonassociative tolerance. Associative tolerance was detectable 1 week later during a second morphine challenge. Compensatory hyperactivity, however, was not observed during a saline challenge in the presence of morphine-associated cues. Following the acquisition of tolerance, nonreinforced exposure to morphine-associated cues produced an attenuation of morphine tolerance (i.e., extinction of tolerance). The results are interpreted as providing partial support for the Pavlovian model and are discussed in terms of alternative associative models of tolerance.  相似文献   

The Consequences of School Desegregation in a Kansas Town 50?Years After Brown     

Jean A. Patterson  Rae Niles  Cameron Carlson  William L. Kelley 《The Urban Review》2008,40(1):76-95

This article examines the legacy of segregation and desegregation in the town of Parsons, Kansas. We argue that school desegregation, the goal of which was to increase access and equalize educational opportunities for African Americans, did not have that desired affect. Fifty years after the closing of the all-Black Douglass School, Parsons’ citizens had not openly acknowledged the effects this event had on the African American community. Three generations later, African American student achievement still lags behind that of White students. These unresolved issues have contributed to a number of losses in the Black community, including loss of Black teachers and loss of talented Black young people. We use theories of social capital and cultural capital as a framework to illustrate how White, middle class students had greater access to school resources, and to identify the social and cultural resources within the Black community that the school district could build upon, such as strong leadership and a sense of resolve and resiliency.

Jean A. PattersonEmail:

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A meaningful meaninglessness: Canadian university culture as gendered and class-based privilege     

Melissa Rae Horsman 《Gender and education》2018,30(1):119-133

Recent Canadian university student misbehaviour (rape chants, harassment, sexual assault, and anti-social media posts) has garnered much attention in the media and from university administrations. Most research concerned to address these issues focuses on sexual attitudes, gender, and party culture. In this study, we analyse student interviews from a narrative perspective and find that students use storytelling devices to construct a gendered, but also class-based, division of self into two parts: university life that ‘does not count’ and post-university life that ‘counts’ in terms of choices and actions. We called this construction a ‘meaningful meaninglessness’. We conclude with a consideration of the meaning of the university in general and how current trends in education may contribute to student alienation.  相似文献