Generating multiple solutions for a problem: A comparison of the responses of U.S. and Japanese students

A task involving simple mathematics, yet complex in its call for the generation of multiple solution methods, was administered to about 150 U.S. students, most of whom were in fourth grade. Written responses were examined for correctness, evidence of strategy use and mode of explanation. Results for the U.S. sample were also compared to those obtained from about 200 Japanese fourth-grade students. Students in both countries (a) produced multiple solutions and explanations of their solutions, (b) exhibited almost identical patterns and frequency of strategy use across response occasions, and (c) used the same kinds of explanations, with a majority of the responses involving solution explanations that combined both visual and verbal/symbolic features. Nevertheless, Japanese students tended to produce explanations involving more sophisticated mathematical ideas (multiplication rather than addition) and formalisms (mathematical expressions rather than verbal explanations) than did U.S. students.     

An integrative and holistic engineering education

The several reports and papers of the past decade suggesting paradigm shifts in engineering education are shown to reveal a common theme, to wit: engineering is an integrative process, and thus engineering education, particularly at the baccalaureate level, should be designed toward that end. Suggesting a change in intellectual culture, the roots of contemporary collegiate education in the United States are traced to their origin and attention is given to discussing the current emphasis on reductionism vis-à-vis integration or, said another way, a course-focused education compared to a more holistic approach in which process and knowledge are woven throughout the curriculum. A new construct for systemic change in baccalaureate engineering education is suggested in terms of a taxonomy of intellectual components connected holistically with a core focus on developing human potential, as opposed to the present system in which students are passed serially through course filters.An early version of this work appeared as Engineering education: Innovation through integration,Journal of Engineering Education 82(1): 3–8, 1993.     

Criminal justice outcomes of prosecution of child sexual abuse: A case flow analysis

This study examined the progress and disposition of child sexual abuse cases referred for prosecution in four urban jurisdictions. Most cases were accepted for prosecution. The vast majority of cases carried forward for prosecution resulted in guilty pleas. Only 9% of the total sample went to trial. A majority of the small number that went to trial were convicted. Over 3/4 of those convicted were incarcerated. The rate at which cases were carried forward for prosecution and convicted was comparable to that of a national sample of felony arrests overall, but child sexual abuse cases were more likely to go to trial (p < .005) and received more severe sentences (p < .005). Our results are strikingly consistent with those from previous studies of prosecution of child sexual abuse. A new understanding of prosecution of child sexual abuse is recommended that takes into account the large proportion of cases that do not go to trial.     

A dynamic decision model for portfolio investment and assets management

This paper addresses a dynamic portfolio investment problem. It discusses how we can dynamically choose candidate assets, achieve the possible maximum revenue and reduce the risk to the minimum level. The paper generalizes Markowitz's portfolio selection theory and Sharpe's rule for investment decision. An analytical solution is presented to show how an institutional or individual investor can combine Markowitz's portfolio selection theory, generalized Sharpe's rule and Value-at-Risk(VaR) to find candidate assets and optimal level of position sizes for investment (dis-investment). The result shows that the generalized Markowitz's portfolio selection theory and generalized Sharpe's rule improve decision making for investment.     

Response rate is not an effective mediator of learned stimulus equivalence in pigeons

We explored response rate as a possible mediator of learned stimulus equivalence. Five pigeons were trained to discriminate four clip art pictures presented during a 10-sec discrete-trial fixed interval (FI) schedule: two paired with a one-pellet reinforcer, which supported a low rate of responding, and two paired with a nine-pellet reinforcer, which supported a high rate of responding. After subjects associated one stimulus from each of these pairs with a discriminative choice response, researchers presented two new clip art stimuli during a 10-sec FI: one trained with a differential reinforcement of low rate schedule (DRL) after the FI and the other trained with a differential reinforcement of high rate schedule (DRH) after the FI. Each of the stimuli that were withheld during choice training was later shown to see if the choice responses would transfer to these stimuli. The results suggest that response rate alone does not mediate learned stimulus equivalence.     

Clinical features of chronic hepatitis B patients with YMDD mutation after lamivudine therapy

INTRODUCTION Chronic hepatitis B(CHB)remains a major public health problem,affecting more than350mil-lion people worldwide.Cirrhosis,liver failure,or hepatocellular carcinoma will develop in approxi-mately15to40percent of infected patients(Ganem and Prince,2004).Lamivudine,an oral nucleoside analogue,inhibits HBV replication(de Clercq,2001;2004;Lai et al.,1997;1998;Marcellin et al.,2004).It can markedly reduce serum HBV DNA levels and normalize alanine aminotransferase(ALT)levels …     

Mental Health in Head Start: New Directions for the Twenty-First Century

This article has two aims: to explore the historical reasons why mental health has been a contested issue in Head Start, and to describe areas of challenge and innovation which might further the program's goal of improving the well-being of parents and children in poverty. The historical sources of silence in the program concerning mental health issues are noted, and recent efforts to bring mental health closer to the center of the Head Start agenda described. Four areas of challenge which are crucial in improving mental health in Head Start, are then reviewed: definitional issues at the individual and family levels, program-level consultation and services, system-level coordination, and macro-level policy changes. In each section, the nature of the challenge, current innovative practices in response to the challenge, and recommendations for further action are discussed. A concluding section presents a summary of recommendations for both program practice and research.     

A critical meta-analysis of all evaluations of state-funded preschool from 1977 to 1998: implications for policy, service delivery and program evaluation

The number of state-funded preschool programs for low-income children has increased dramatically over the past few decades, and recent research has indicated that these programs vary considerably along a variety of dimensions. By 1998 only 13 of the current 33 state preschool programs (which serve children 3 to 5, provide some form of classroom-based educational service, and are primarily funded and administered at the state level) had completed a formal evaluation of the program’s impact on child outcomes. This paper presents a critical meta-analytic review of these evaluations, providing measures of standardized effects for all significant impacts to facilitate comparisons across differing domains of outcome and evaluative methods. Although several methodological flaws in these studies are identified, the pattern of overall findings may offer modest support for positive impacts in improving children’s developmental competence in a variety of domains, improving later school attendance and performance, and reducing subsequent grade retention. Significant impacts were mostly limited to kindergarten and first grade; however, some impacts were sustained several years beyond preschool. The results of these studies were similar to evaluations of other large-scale preschool programs for low-income children, such as Head Start. Modest outcome goals are warranted for preschool programs serving low-income children, for example, the promotion of school readiness. Suggestions are presented for improved preschool and early intervention program evaluation.     

A study assessing the potential of negative effects in interdisciplinary math-biology instruction

There is increasing enthusiasm for teaching approaches that combine mathematics and biology. The call for integrating more quantitative work in biology education has led to new teaching tools that improve quantitative skills. Little is known, however, about whether increasing interdisciplinary work can lead to adverse effects, such as the development of broader but shallower skills or the possibility that math anxiety causes some students to disengage in the classroom, or, paradoxically, to focus so much on the mathematics that they lose sight of its application for the biological concepts in the center of the unit at hand. We have developed and assessed an integrative learning module and found disciplinary learning gains to be equally strong in first-year students who actively engaged in embedded quantitative calculations as in those students who were merely presented with quantitative data in the context of interpreting biological and biostatistical results. When presented to advanced biology students, our quantitative learning tool increased test performance significantly. We conclude from our study that the addition of mathematical calculations to the first year and advanced biology curricula did not hinder overall student learning, and may increase disciplinary learning and data interpretation skills in advanced students.