数字生态系统中创业机会的形成与发展：基于社会资本理论的探究

数字创业浪潮方兴未艾, 机会属性变化引起的数字创业机会形成与变化规律尚未被揭示。本研究以数字生态系统作为研究情境, 分析创业者利用数字生态系统可供性积累的社会资本, 如何影响创业机会形成与发展。从机会的合意性维度和内容维度两方面解释创业机会的变化规律, 考察创业者认知监控与新创企业数字化程度对这一路径的调节作用。本研究拓展社会资本理论在数字创业背景下的应用, 深化数字生态系统中的创业机会研究, 有助于指导创业者利用数字平台开展“破坏性创造”, 提升机会识别质量和效率, 促进创业生态系统建设。     

An Analysis of Fundamental Issues in the Research of Artificial Intelligence Ethical Risk Prevention

While receiving widespread attention, the fundamental issues in the research of artificial intelligence (AI) ethical risk prevention need to be probed and articulated. Although the relevant research is still at an initial stage with long-term tasks, it has a very important social significance. The strategic goals of AI ethical risk prevention research are clarifying ethical risks, taking flexible and effective measures, and providing ethical support for the development of AI technology. This paper argues that key tasks must be of the top priority, such as broadening the theoretical foundation, evaluating ethical risks, realizing ethical design and solving core ethical risks. Therefore, the research of AI ethical risk prevention can be substantially promoted.     

语义预设的合理性辩护

弗雷格是第一个注意到命题的预设为假会影响到命题真值判定的哲学家。对这种因预设为假而形成的真值空隙,弗雷格、罗素和斯特劳森提出了不同的处理方式,由此奠定了预设的语义解释的基础。但预设的语义解释一直面临着种种质疑。这些质疑有说服力吗?应该放弃预设的语义解释吗?本文将对此进行分析,揭示这些质疑中所存在的问题,从而对预设的语义解释的合理性进行辩护。一、预设为假与真值空隙第一个把预设作为逻辑概念加以讨论的哲学家是弗雷格,其预设思想可以归纳为四点:第一,预     

临床胜任能力及其评价

临床胜任能力既包括与医疗实践相关的专业知识和技能,又包括人际交往能力、终身学习能力、人格特征等。运用知识和技能处理实际工作中遇到的问题,并最终使患者获得好的健康状态才是评价临床胜任能力的金标准。因此,医学教育应以培养医学生的临床胜任能力为目标,医学生考评也应与此目标相一致。     

农民工职业自我效能感的结构

职业自我效能感是影响个体职业发展的重要心理因素。在开放式问卷调查和文献研究的基础上,初步建构了农民工职业自我效能感的结构。对155人样本数据的探索性因素分析和对146人样本数据的验证性因素分析的结果支持了农民工的职业自我效能感包括职业胜任自我效能感、职业关系自我效能感、职业学习与发展自我效能感、职业问题解决自我效能感四个因素的建构。对农民工职业自我效能感问卷的信度与效度的检验显示,问卷的信度与效度能够达到心理测量的基本要求,可以作为农民工职业自我效能感的测量工具。     

Standing in the glory or shadow of the past self: Cultures differ in how much the past self affects current subjective well-being

Research in the past 2 decades has made great strides in understanding cross-cultural differences in the correlates and causes of subjective well-being. On the basis of past findings on the cross-cultural differences in temporal perspectives of the self, the present research examined a cross-cultural difference in individuals' subjective well-being as a function of how positively they viewed their present and past selves. Study 1 showed that both European and Asian Americans had higher subjective well-being when they viewed their present selves more positively. However, positive evaluations of the past self were accompanied by higher subjective well-being only among Asian Americans. Study 2 showed that when induced to think positively (vs. negatively) of the present self, both European and Asian Americans judged their current lives more favorably. However, when led to view the past self positively (vs. negatively), only Asian Americans made more favorable judgments about their current lives. (PsycINFO Database Record (c) 2012 APA, all rights reserved).     

Effects of Si addition on the microstructure evolution of Al–Cu–Mg alloys in the α + S + T phase field

The precipitation behaviour and age-hardening response of Al–1.5Cu–4.0Mg (wt.%) alloys microalloyed with Si have been investigated by means of hardness measurement, TEM and HRTEM. Compared to the ternary alloy, the quaternary alloys exhibit a higher hardness. It is found that the underaged microstructure in the Al–1.5Cu–4.0?Mg alloy contains some fine precipitates, which are identified as the T phase by FFT spectra. The peak-aged microstructures of the ternary alloy is dominated by the T phase, while the peak-aged microstructures of the Si-containing alloys are dominated by the S phase. The volume fraction of the S phase is found to increase as more Si is added.     

二参数逻辑斯蒂模型项目参数的估计精度

项目参数的估计精度对于测验的编制尤其是题库的建立十分重要。目前,国内外对项目参数估计精度的研究,大部分是基于在已知项目参数真值的情况下,运用各种参数估计方法产生新的估计值,再和真值进行偏度(BIAS)和均方根差(RMSE)的比较,从而说明该种估计方法的有效性。但是这种方法不能提供不同的参数真值之间的估计误差的变化规律。为了弥补这一缺陷,本文尝试从项目参数估计信息函数的角度出发研究项目参数的估计精度问题。本研究以二参数Logistic模型作为研究对象,首先定义了项目参数的估计信息函数,然后基于完全随机实验设计,通过模拟研究的方法探索影响项目参数的估计精度的因素,实验共设计了(2×3×2)种情形。研究结果表明：(1)项目参数(a,b)的估计精度均随着被试样本量的增大而提高;(2)被试的能力分布对难度参数的估计精度影响较大,对区分度参数的估计精度影响相对较小;(3)难度参数和区分度参数的估计精度都分别受到参数a和参数b的共同作用。     

叙事治疗在创伤领域的应用及其与EMDR的异同

叙事治疗是以后现代哲学为基础,并整合人类学、叙事文学和发展心理学而发展出的家庭治疗方法.在创伤领域,叙事治疗通过识别来访者对创伤的回应,发展替代人生故事和身份认同,使来访者获得心理和情感的安全感,并促使创伤记忆被整合进替代故事中,从而消除创伤影响.在儿童创伤领域,生命树技术通过生命树、生命森林、当暴风雨来临以及证书和歌曲四个部分,帮助患儿发展替代人生故事.本文还比较了创伤叙事治疗同眼动脱敏与再加工治疗的异同及创伤叙事治疗国内外应用进展.作为一种创伤治疗方法,叙事治疗在创伤领域应用具有很好的疗效.     

医学人文与医疗实践结合:人性化的医疗

医学人文与医学科学的结合是当代科学与人文关系的特点和本性,也是医学现实的迫切需求,其目标是实现人性化的医疗;医学人文存在不同水平的三个层次;医疗人性化是一个广阔的领域;营造平台是促进两者结合的重要条件.医学人文具有理论和实践两个向度,医学人文的实践向度是整个医学人文或人文医学的基础,没有实践向度,理论向度就失去了基础,整个医学人文就会成为不着边际的空话.医学人文的理论向度和实践向度,其基础都在临床实践.