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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
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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
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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.
相似文献
Jean A. PattersonEmail: |
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In a randomized controlled trial, the effectiveness of Parent-Child Interaction Therapy (PCIT) and correlates of maltreatment outcomes were examined. Mothers (N = 150) had a history or were at high risk of maltreating their children. After 12 weeks and compared to waitlist, PCIT mothers were observed to have improved parent-child interactions and reported better child behavior and decreased stress. At PCIT completion, improvements continued and mothers reported less child abuse potential and had improved maternal sensitivity. Also, PCIT completers were less likely to be notified to child welfare than noncompleters. Finally, those families not notified post-PCIT showed greater reductions in child abuse potential and improvements in observed sensitivity during treatment. Implications for theory and practice are discussed. 相似文献
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Pamella Rae Stoeckel 《Community College Journal of Research & Practice》2013,37(11):895-912
Code Blue addresses the capacity challenges in healthcare training. This pilot, grant funded project, focuses on a holistic approach to selecting and educating career ready and capable students and training them to be confident and competent healthcare workers. Lessons learned from this project will be assessed and reviewed for replication. 相似文献
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Linda Rae Bennett 《Sex education》2013,13(4):371-386
Sexuality and sex education cannot be divorced from the moral values of the societies within which we must negotiate our sexual identities and relationships. Rather than pandering to the moral panic that is too often associated with the provision of sex education in non‐secular societies where religion is more visibly active in shaping sexual ideals and norms, this article takes up the challenge of investigating a relationship that is often represented as being innately contradictory. It explores the Islamic notion of zina (illicit sex) in relation to the provision of comprehensive sex education for Muslim youth in contemporary Indonesia. The article initially establishes the demand for sex education among Indonesian youth from the overlapping perspectives of health, human rights and Islam. It then explores the notion of zina in detail and exposes how Islamic stipulations against premarital sex are not necessarily in conflict with the provision of sex education. The final section of the article refines the argument in favour of utilizing Islam as a framework for developing religiously appropriate sex education and describes a suitable approach and content for Islamic sex education curricula for Indonesian youth. 相似文献
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Tina Rae 《Emotional and Behavioural Difficulties》2013,18(2):213-216
Research has identified a significant relationship between social, emotional and behavioural difficulties (SEBD) and speech, language and communication difficulties (SLCD). However, little has been published regarding the levels of knowledge and skill that practitioners working with pupils experiencing SEBD have in this important area, nor how they might more effectively detect and support SLCD in the children and young people with whom they work. This paper outlines a small-scale project intended to evaluate said knowledge and skills within an SEBD support team in central England, and to increase this team's effectiveness in detecting and supporting children experiencing SLCD. 相似文献