对我国肝移植现状的系统化思考

阐述了我国肝移植的现状及新时期肝移植的新特点,用系统的观点分析了我国肝移植实施中存在的问题,提出了今后如何系统化发展我国肝移植事业的几点设想。     

小学生表征数学应用题策略的实验研究

通过一个2(成功与否)×2(提示与否)×2(题型)的混合实验设计,对小学五年级学生解决和差应用题的表征策略进行了研究.结果表明:(1)与比较应用题的表征相类似,小学生对和差应用题的表征也存在着直译策略和问题模型策略;(2)不成功组解题者在表征和差应用题时倾向于运用直译策略,而成功组的解题者更倾向于运用问题模型策略,这导致了成功者与不成功者在列式上的差异,特别是在不一致题型上表现得更明显;(3)在读题前给以“请注意理解这道题的意思”这样简单的提示,对不成功的解题者对和差问题的正确表征并不能起到作用;(4)成功的和差应用题解题者和不成功的解题者在列式正确性的自我评价上存在显著差异.     

JUST WAR THEORY,HUMANITARIAN INTERVENTION,AND THE NEED FOR A DEMOCRATIC FEDERATION

The primary purpose of government is to secure public goods that cannot be achieved by free markets. The Coordination Principle tells us to consolidate sovereign power in a single institution to overcome collective action problems that otherwise prevent secure provision of the relevant public goods. There are several public goods that require such coordination at the global level, chief among them being basic human rights. The claim that human rights require global coordination is supported in three main steps. First, I consider Pogge's and Habermas's analyses as alternatives to Hobbesian conceptions of justice. Second, I consider the core conventions of international law, which are in tension with the primacy of state sovereignty in the UN system. Third, I argue that the just war tradition does not limit just causes for war to self‐defense; it supports saving innocent third parties from crimes against humanity as a just reason for war. While classical authors focused less on this issue, the point is especially clear in twentieth‐century just war theories, such as those offered by the American Catholic bishops, Jean Elshtain, Brian Orend, and Michael Walzer. Against Walzer, I argue that we add intractable military tyranny to the list of horrors meriting intervention if other ad bellum conditions are met. But these results require us to reexamine the “just authority” of first resort to govern such interventions. The Coordination Principle implies that we should create a transnational federation with consolidated powers in place of a treaty organization requiring near‐unanimity. But to be legitimate, such a global institution must also be directly answerable to the citizens of its member states. While the UN Security Council is inadequate on both counts, a federation of democracies with a directly elected executive and legislature could meet both conditions.     

Critical thinking in North America: A new theory of knowledge,learning, and literacy

The pace of change in the world is accelerating, yet educational institutions have not kept pace. Indeed, schools have historically been the most static of social institutions, uncritically passing down from generation to generation outmoded didactic, lecture-and-drill-based, models of instruction. Predictable results follow. Students, on the whole, do not learn how to work by, or think for, themselves. They do not learn how to gather, analyze, synthesize and assess information. They do not learn how to analyze the diverse logic of the questions and problems they face and hence how to adjust their thinking to those problems. They do not learn how to enter sympathetically into the thinking of others, nor how to deal rationally with conflicting points of view. They do not learn to become critical readers, writers, speakers and listeners. They do not learn how to use their native languages clearly, precisely, or persuasively. They do not, therefore, become literate, in the proper sense of the word. Neither do they gain much in the way of genuine knowledge since, for the most part, they could not explain the basis for what they believe. They would be hard pressed to explain, for example, which of their beliefs were based on rational assent and which on simple conformity to what they have been told. They have little sense as to how they might critically analyze their own experience, or identify national or group bias in their own thinking. They are much more apt to learn on the basis of irrational than rational modes of thought. They lack the traits of mind of a genuinely educated person: intellectual humility, courage, integrity, perseverance, and faith in reason.Happily, there is a movement in education today striving to address these problems in a global way, with strategies and materials for the modification of instruction at all levels of education. At its foundation is an emerging new theory of knowledge, learning, and literacy, one which recognizes the centrality of independent critical thinking to all substantial learning, one which recognizes that higher-order, multilogical thinking is as important to childhood as to adult learning, and as important to foundational learning in monological as in multilogical disciplines. This educational reform movement is not proposing an educational miracle cure, for its leading proponents recognize that many social and historical forces must come together before the ideals of the critical thinking movement will become a full academic reality. Schools do not exist in a social vacuum. To the extent that the broader society is uncritical so, on the whole, will be society's schools. Nevertheless, the social conditions necessary for fundamental changes in schooling are increasingly apparent. The pressure for fundamental change is growing. Whether and to what extent these needed basic changes will be delayed or side-tracked, thus requiring new periodic resurgences of this movement, with new, more elaborate articulations of its ideals, goals, and methods — only time will tell.     

Exposure to community violence and social support as predictors of anxiety and social and emotional behavior among African American children

We examined the effects of exposure to violence and social support on self-reported state and trait anxiety and parental rated problem behaviors among school-aged African-American children in low and high violence areas. Ninety-seven (97) fourth through sixth graders and their parents were interviewed about exposure to community violence, social support, and state and trait anxiety. Results indicate that trait anxiety was correlated positively with exposure to violence and negatively with social support. State anxiety was correlated negatively with family social support. Problem behaviors were correlated negatively with family support and income. Hierarchial multiple regression analyses indicated that children's reports of their exposure to community violence continued to explain significant variability in trait anxiety, and problem behavior after controlling for both income and social support measures. Social support from peers, family and teachers played differential roles in predicting problem behaviors among children from high and lower violence areas. These findings suggest that in planning intervention programs for children exposed to violence, greater attention to empowering parents to support their children, to fostering peer group support, and to bolstering teacher support may be useful, but attention to the underlying socio-political causes of violence exposure is essential.     

Cross-cultural investigations of stress: Conceptual and methodological considerations

Cross-cultural studios on stress are confounded by conceptual, methodological and applied problems. Although several comprehensive definitions of stress have been offered, the conceptual schema from which the definitions emerge reflect a Western perspective and are not always relevant when transposed into other cultures. The word stress itself is not easily translated into other languages which creates a problem for research workers in non-Western cultures. While studies in India of Westernized executives in organizations using Western models have offered valuable insights into problems related to organizational structures, executive stress, etc., they do not tell us a great deal about the nature and experience of stress in the rest of the population. A brief history of stress research is offered with a concentration on stress research in India. Conceptual and methodological issues are discussed leading to an assessment of the difficulties of stress research in India.     

Family characteristics as mediators of the influence of problem drinking and multiple risk status on child mental health

Structural equation modeling was used to test a theoretical model in which family cohesion and family reframing coping were hypothesized as mediators between family drinking problems, multiple risk factors, negative life events, and child mental health (conduct disorder, depression, anxiety) in two-parent families. Family cohesion mediated the relationships of family drinking problems and negative life events to child conduct disorder and depression. Negative life events mediated the relationships of family drinking problems and family multiple risk to child conduct disorder. Family reframing coping did not function as a mediator nor was it related to child mental health when other factors were considered simultaneously. Results indicate that increasing family cohesion and reducing sources of stress within the family (negative life events) represent promising areas for interventions for children with problem-drinking parents. Work on this study was funded in part by the National Institute for Mental Health Grant 2-P50-MH39246-06 to support a Preventive Intervention Research Center. The authors gratefully acknowledge contributions made by Rita Shell, Marcia Michaels, Joanne Gersten, George Knight, and Carolyn Berg.     

Stories we tell each other: A comparison of families' and their therapists' explanations of presenting problems

This study reports the explanations of presenting problems given by 10 mothers of children referred to a department of child and family psychiatry and their therapists. Video-recordings of therapists' pre-session meetings and the initial therapy sessions were searched for explanatory statements. These statements were then coded. It was found that therapists referred to past events, present circumstances, relationships, and possible future events in their explanations of presenting problems significantly more frequently than mothers. It was rare for mothers to speak in terms of past or future events at all. The mothers explained difficulties in terms of character traits significantly more often than did the therapists. The implications of these findings are discussed.Thanks to all of the child and family consultation team at 1 Wolverton Gardens for their participation in this research and particularly to Ruth Kossoff for her great help with organising data collection.     

Dealing with time pressure

A sample of 250 people completed a questionnaire where they rated 30 statements describing their behavior and experiences during a recent time pressure situation. A factor analysis resulted in three factors: Personal Burden, Work Problems and Difficulties, and Challenge Orientation. People high on this last factor liked the excitement of being under pressure, were very absorbed in the task, and showed signs of being effective in dealing with the situation. Such individuals were having what has been identified as a flow experience often observed in sports and the arts. The results of this study suggest that effective coping with time pressure is related to taking a task-oriented attitude, avoiding self-preoccupation, and using time management skills to focus on successful achievement.     

Ecological influences in youth crisis shelters: Effects of social density and length of stay on youth problem behaviors

For 472 consecutive days we monitored the number of youths residing in a crisis shelter for adolescents, the average length of stay for the youths residing in the shelter on each day, and the number of problem behaviors occurring within the shelter on a daily basis. We analyzed these data using a combination of time series and logistic regression techniques to fit a model that would predict the occurrence of a problem behavior on any given day. After controlling for significant time trends in the data, our results indicate that both the number of youths in the shelter and the proportion of youths who have resided in the shelter longer than 14 days are significantly associated with a problem behavior occurring on any given day. The number of youths in the shelter and the probability of a problem behavior occurring correlated significantly. However, as the proportion of youths who resided in the shelter longer than 14 days increased, the probability of a problem behavior occurring decreased.