Circle graphs and monadic second-order logic

This article is part of a project consisting in expressing, whenever possible, graph properties and graph transformations in monadic second-order logic or in its extensions using modulo p cardinality set predicates or auxiliary linear orders. A circle graph is the intersection graph of a set of chords of a circle. Such a set is called a chord diagram. It can also be described by a word with two occurrences of each letter, called a double occurrence word. If a circle graph is prime for the split (or join) decomposition defined by Cunnigham, it has a unique representation by a chord diagram, and this diagram can be defined by monadic second-order formulas with the even cardinality set predicate. By using the (canonical) split decomposition of a circle graph, we define in monadic second-order logic with auxiliary linear orders all its chord diagrams. This construction uses the fact that the canonical split decomposition of a graph can be constructed in monadic second-order logic with help of an arbitrary linear order. We prove that the order of first occurrences of the letters in a double occurrence word w that represents a connected circle graph determines this word in a unique way. The word w can be defined by a monadic second-order formula from the word of first occurrences of letters. We also prove that a set of circle graphs has bounded clique-width if and only if all the associated chord diagrams have bounded tree-width.     

2.5至7.5岁儿童关于图画作者能力特点的认知发展

借助2岁儿童图画作品,考察25至75岁儿童对于图画作者能力特点的认知发展状况。结果表明：2．5岁到55岁的儿童,在本实验情境的图画判断过程中尚不能考虑小年龄图画作者的能力特点,65岁以后儿童的这种能力得到了,发展。研究对儿童理解图画作者能力的心智基础进行了分析。     

道德的法律强制探析

由于存在着道德仅靠自身力量所无法解决的问题 ,而这些问题因其对社会秩序和社会生活的重要性又必须获得解决 ,使得道德的法律强制成为必要。多元背景下道德共识的存在 ,道德与法律共同的问题域以及现代社会的立法民主化机制 ,为道德的法律强制提供了可能。道德法律强制的合理性 ,只有通过对于应当予以法律强制的道德的性质、可强制的道德的范围以及道德法律强制的立法和司法程序的学理分析 ,方可予以证成。     

Children Apply Principles of Physical Ownership to Ideas

Adults apply ownership not only to objects but also to ideas. But do people come to apply principles of ownership to ideas because of being taught about intellectual property and copyrights? Here, we investigate whether children apply rules from physical property ownership to ideas. Studies 1a and 1b show that children (6–8 years old) determine ownership of both objects and ideas based on who first establishes possession of the object or idea. Study 2 shows that children use another principle of object ownership, control of permission—an ability to restrict others’ access to the entity in question—to determine idea ownership. In Study 3 , we replicate these findings with different idea types. In Study 4 , we determine that children will not apply ownership to every entity, demonstrating that they do not apply ownership to a common word. Taken together, these results suggest that, like adults, children as young as 6 years old apply rules from ownership not only to objects but to ideas as well.     

肿瘤干细胞分离方法研究现状

肿瘤干细胞理论能够解释肿瘤的发生、发展和转移等生物学行为,使人们对恶性肿瘤有一个全新的认识,为临床治疗展现全新视角,使肿瘤靶向治疗找到了新靶点,改变目前药物针对全部癌细胞的治疗策略。本文就肿瘤干细胞分离方法做一简要综述。     

大脑两半球与整体和局部性质的选择性加工

研究大脑两半球在加工整体和局部性质中的优势以及两半球能否同时分别选择两个复合刺激的整体和局部性质。实验中把一个复合字母随机呈现在左视野或右视野,或者把两个复合字母同时分别呈现在左视野和右视野。实验一发现,在单侧呈现条件下,被试检测左右视野的整体或局部靶目标的反应时没有显著差别,但在双侧同时呈现条件下,检测右视野局部靶目标比检测左视野局部靶目标时的反应时短。实验二要求被试检测同时呈现在左右视野的整体或局部靶目标,发现当两个视野的靶目标处于同一水平时(整体或局部)反应时较短,两个视野的靶目标处于不同水平时(一侧处于整体水平而另一侧处于局部水平)反应时较长。这些结果提示,当两个复合刺激同时呈现在左右视野时,大脑左半球在选择性加工局部性质时具有优势;左右两半球更容易选择两个复合刺激同一个水平的性质,分别选择两个复合刺激不同水平的性质比较困难。     

公立医院体制改革的思考

公立医院体制改革给一些难以为继的中小医院带来一线生机,但是医院体制改革过程中存在的一些问题一直未得到妥善解决。通过对公立医院体制改革的益处及弊端的剖析,提出公立医院体制改革的建议,以保证改革的步伐健康有序地发展。     

短时距估计中的标量特性

使用单任务研究程序,采用预期式研究范式和再现时距的研究方法,从心理物理学的视角,通过三个实验系统地考查了人类短时距估计的标量特性、变异源、时距估计中的转换点和韦伯函数的形态等问题。结果表明,刺激物的运动、变化、速度和物理时距是被试进行短时距估计的重要变异源;被试在实验中表现出高估较短时距和低估较长时距的倾向,时距估计的转换点为11.1s;计时过程中得到的韦伯函数是个分段连续函数, 韦伯函数的拐点有两个12s和21s,这两点与本研究得到的时距估计转换点具有部分一致性     

意图信息在物权判断和道德判断中的作用

意图会影响人们的道德判断,但尚不清楚意图在物权判断中的作用。本研究以266名非法学专业的大学生为被试,通过包含不同意图（恶意/善意/无意）的故事情境,考察了在损失求偿和获益分享情境中人们的物权判断和道德判断。结果发现,在损失求偿情境中,不管是出于善意、恶意还是无意,被试均判断行为者应当赔偿他人损失,但不认为无意的行为者应受谴责。在获益分享情境中,被试认为善意的行为者应分享给他人带来的收益且应受赞扬,但恶意的行为者不应分享收益和受赞扬。综合来看,物权判断比道德判断较少受意图信息的影响,反映人们的物权判断具有领域特异性。