墨西哥医疗保障体系改革及其对我国的借鉴

墨西哥近年的医疗卫生改革取得了巨大的成就.通过简要地描述墨西哥人群健康状况、医疗卫生资源现状、卫生系统绩效以及与中国的比较,分析了墨西哥三轮卫生改革的特点、存在的问题以及面临的挑战,旨在提出墨西哥卫生系统与医疗保障体系改革对我国医疗卫生改革的启示和借鉴.     

人工智能的瓶颈问题与本体论语义学的回应

意向性问题曾经是19~20世纪转折时期最热门的话题之一。无独有偶,在新的世纪转折时期,它再次受到人们的亲睐。所不同的是,它不再只是一个纯学术问题,而同时带有工程学的性质。当今的心灵哲学与其他关心智能问题的具体科学如人工智能、计算机科学、认知科学等,尽管各自走着迥然不同的运思路线,但最终都发现意向性是智能现象的独有特征和必备条件。然而作为现代科技之结晶的计算机所表现出的所谓智能,尽管在许多方面已远胜于人类智能,但它只能按形式规则进行形式转换,而不能像人类智能那样主动、有意识地关联于外部事态,即没有涉及到意义,或没…     

解题反思对数学学业优差生解题过程的影响

考察解题反思对数学学业优生和差生解题结果及所用策略的不同影响。选取初一至初三年级的数学学业优生和差生为被试,以一套连加数问题为实验材料,进行一对一的测试,前后进行两次测试。对反思组优差生(优生12人,差生10人)和无反思组优差生(优生14人,差生14人)解题过程的比较,发现:1)解题后立即进行反思能够提高差生的解题正确率,但是延长解题时间;2)先前的解题反思对优生和差生后续解题时的正确率和解题时间均不产生明显影响;3)解题后立即进行反思能够促进优生和差生使用高效策略,放弃低效策略;4)先前的解题反思在后续解题中仍然促进学生使用高效策略,对优生的促进作用比对差生更明显。     

天台智顗丑学流程解构

天台宗性具善恶说,具有较为明显的泛恶倾向,且处处脱不了审丑思维。自梁、陈入隋,智顗弘法数十载,其中贯穿了对丑类恶物的审度和涵化。不光恶为丑因、恶中见丑、审丑观恶,善和美也以各种通道与丑相融互格,共同呈现出多维流动、浑化自洽的球体架构。这种圆融宽厚的丑学,反映了“末法时期”的悲悯思维,也昭示着一个恢宏多采时代的到来。     

对"网络红人"形成原因的伦理反思

从木子美现身网络并以"迅雷不及掩耳"之势走红开始,"网络红人"已越来越成为人们所关注的对象."网络红人"的出现,既有客观的主体虚拟的原因,也有主体自身的角色变换及相关主体的评价失衡原因,因而"网络红人"的形成实际上是网络社会发展的必然产物,它不仅是技术的产物,也是人与人之间新的伦理关系的产物,是新的利益关系的产物.     

科学幻想小说中的宗教题材

自1818年著名英国诗人雪莱的妻子、二十岁的玛丽·雪莱发表了一部题为《弗兰肯斯坦》的小说以来,科学幻想小说走过了近二百年的历史。其间涌现出无数优秀作品,涉及的题材无所不包。一般认为,西方的科幻小说基本上可以分成以下四类主题:     

Increased brain serotonin turnover in panic disorder patients in the absence of a panic attack: reduction by a selective serotonin reuptake inhibitor

Since the brain neurotransmitter changes characterising panic disorder remain uncertain, we quantified brain noradrenaline and serotonin turnover in patients with panic disorder, in the absence of a panic attack. Thirty-four untreated patients with panic disorder and 24 matched healthy volunteers were studied. A novel method utilising internal jugular venous sampling, with thermodilution measurement of jugular blood flow, was used to directly quantify brain monoamine turnover, by measuring the overflow of noradrenaline and serotonin metabolites from the brain. Radiographic depiction of brain venous sinuses allowed differential venous sampling from cortical and subcortical regions. The relation of brain serotonin turnover to serotonin transporter genotype and panic disorder severity were evaluated, and the influence of an SSRI drug, citalopram, on serotonin turnover investigated. Brain noradrenaline turnover in panic disorder patients was similar to that in healthy subjects. In contrast, brain serotonin turnover, estimated from jugular venous overflow of the metabolite, 5-hydroxyindole acetic acid, was increased approximately 4-fold in subcortical brain regions and in the cerebral cortex (P < 0.01). Serotonin turnover was highest in patients with the most severe disease, was unrelated to serotonin transporter genotype, and was reduced by citalopram (P < 0.01). Normal brain noradrenaline turnover in panic disorder patients argues against primary importance of the locus coeruleus in this condition. The marked increase in serotonin turnover, in the absence of a panic attack, possibly represents an important underlying neurotransmitter substrate for the disorder, although this point remains uncertain. Support for this interpretation comes from the direct relationship which existed between serotonin turnover and illness severity, and the finding that SSRI administration reduced serotonin turnover. Serotonin transporter genotyping suggested that increased whole brain serotonin turnover most likely derived not from impaired serotonin reuptake, but from increased firing in serotonergic midbrain raphe neurons projecting to both subcortical brain regions and the cerebral cortex.     

Alteration of cingulate long-term plasticity and behavioral sensitization to inflammation by environmental enrichment

Exposure to an enriched environment (EE) has been shown to induce cortical plasticity. Considerable amount of research is focused on the effects of EE in the hippocampus; however, effects of EE on other brain regions and the mechanisms involved are not well known. To investigate this, we induced cortical plasticity by placing mice in an EE for one month and measured the effects of EE in the anterior cingulate cortex (ACC). Here, we show that EE enhanced the expression of the plasticity gene, egr-1, in the ACC of EE animals accompanied by enhanced cingulate long-term potentiation (LTP) and decreased cingulate long-term depression (LTD). The increased NMDA receptor NR2B/NR2A subunits current ratio is associated with the plasticity seen in the ACC while total protein levels remain unchanged. Furthermore, behavioral experiments show that these mice exposed to EE demonstrate enhanced responses to acute and long-term inflammation. Our findings suggest that exposure to EE alters physiological properties within the ACC which results in enhanced responses to inflammation.     

普遍价值和必要价值

本文提出几个论点：重要的普遍价值必须是普遍必要价值;以＂关系＂作为分析单位才能够普遍有效地定义什么是普遍价值;验证普遍价值的最佳模式是普遍模仿。     

规则空间方法与属性层次方法的诊断准确性比较

规则空间方法与属性层次方法是两种常见的认知诊断方法.前者通过建立规则空间,用马氏距离进行判别归类;后者主要根据相似概率判别归类.本文采用模拟研究与实测数据相结合对这两种方法进行了比较.研究结果表明,属性层次方法的诊断准确性较规则空间方法要好.