执行功能是个体认知能力的核心,决定高级心理功能的实现。并且执行功能训练已被广泛运用到情绪障碍个体的治疗康复、脑损伤个体的认知恢复、中小学儿童的认知能力训练等方面。理解执行功能的内部结构和运作机制对于研究个体认知过程具...执行功能是个体认知能力的核心,决定高级心理功能的实现。并且执行功能训练已被广泛运用到情绪障碍个体的治疗康复、脑损伤个体的认知恢复、中小学儿童的认知能力训练等方面。理解执行功能的内部结构和运作机制对于研究个体认知过程具有重大意义。2000年,Miyake等提出了执行功能的分离联系模型,自此以后关于执行功能的研究均建立在这一模型的基础上。但此模型并不能完全解释执行功能子功能之间的内部结构和运行机制,使得我们难以解释执行功能训练产生迁移效果以及部分执行功能训练改善效果不显著的原因。为此,文章通过对执行功能的子功能(抑制、刷新、转换)在信息相关电位、脑成像研究的基础上进行梳理,对抑制、刷新、转换的关系进行探索,根据认知加工的信息处理理论提出了执行功能的序列并行加工模型假说,补充和完善Miyake的分离联系模型,以便更好地理解执行功能子功能之间的内部关系以及作用机制。未来可以从收集fMRI、执行功能发展的年龄变化、子功能伴随比例的角度去进一步完善这一理论模型。Executive function is the core of individual cognitive ability and determines the realization of advanced mental functions. Executive function training has been widely used in the treatment and rehabilitation of individuals with emotional disorders, the cognitive recovery of individuals with brain injuries, and the cognitive training of primary and secondary school children, etc. Comprehending the internal structure and operational mechanism of executive functions holds great significance for researching individual cognitive processes. In 2000, Miyake et al. put forward the dissociated and associated model of executive functions, and since then, studies on executive functions have all been based on this model. However, this model fails to fully elucidate the internal structure and operational mechanisms among the subfunctions of executive functions, making it challenging to explain the reasons for the transfer effects of executive function training and the insignificant improvement in some executive function training. For this reason, this paper, based on the studies of the subfunctions of executive functions (inhibition, updating, and shifting) in information-related potentials and brain imaging, explores the relationships between inhibition, updating, and shifting. According to the information processing theory of cognitive processing, a hypothesis of the sequential parallel processing model of executive functions is proposed to supplement and perfect Miyake’s dissociated and associated model in order to better understand the internal relationships and functional mechanisms among the subfunctions of executive functions. In the future, this theoretical model can be further refined from the perspectives of collecting fMRI, age change in executive function development, and the proportion of subfunctions.展开更多
为解决Hadoop云平台无法动态控制用户访问请求的问题,提出一种基于用户行为评估的Hadoop云平台动态访问控制(DACUBA,dynamic access control based on user behavior assessment)模型。该模型首先实时收集用户指令序列,通过并行指令序...为解决Hadoop云平台无法动态控制用户访问请求的问题,提出一种基于用户行为评估的Hadoop云平台动态访问控制(DACUBA,dynamic access control based on user behavior assessment)模型。该模型首先实时收集用户指令序列,通过并行指令序列学习(PCSL,parallel command sequence learning)获取用户行为轮廓。然后利用前向轮廓建立全局K模型,对后续行为序列进行分类并对分类结果进行评估。随后将评估结果与改进Hadoop访问控制机制结合,使云平台用户的访问权限随自身行为动态改变。最后通过实验验证了模型算法的有效性和动态访问控制机制的可行性。展开更多
Most DNA shuffling methods currently used require PCR process. A novel method of DNA shuffling without PCR process is described, taking advantage of the feature of some restriction enzymes whose recognition sites diff...Most DNA shuffling methods currently used require PCR process. A novel method of DNA shuffling without PCR process is described, taking advantage of the feature of some restriction enzymes whose recognition sites differ from their cleavage sites, thus giving rise to different cohesive ends.These cohesive ends can be rejoined at their native sites from different parental sequences, generating new sequences with various combinations of mutations.展开更多
文摘执行功能是个体认知能力的核心,决定高级心理功能的实现。并且执行功能训练已被广泛运用到情绪障碍个体的治疗康复、脑损伤个体的认知恢复、中小学儿童的认知能力训练等方面。理解执行功能的内部结构和运作机制对于研究个体认知过程具有重大意义。2000年,Miyake等提出了执行功能的分离联系模型,自此以后关于执行功能的研究均建立在这一模型的基础上。但此模型并不能完全解释执行功能子功能之间的内部结构和运行机制,使得我们难以解释执行功能训练产生迁移效果以及部分执行功能训练改善效果不显著的原因。为此,文章通过对执行功能的子功能(抑制、刷新、转换)在信息相关电位、脑成像研究的基础上进行梳理,对抑制、刷新、转换的关系进行探索,根据认知加工的信息处理理论提出了执行功能的序列并行加工模型假说,补充和完善Miyake的分离联系模型,以便更好地理解执行功能子功能之间的内部关系以及作用机制。未来可以从收集fMRI、执行功能发展的年龄变化、子功能伴随比例的角度去进一步完善这一理论模型。Executive function is the core of individual cognitive ability and determines the realization of advanced mental functions. Executive function training has been widely used in the treatment and rehabilitation of individuals with emotional disorders, the cognitive recovery of individuals with brain injuries, and the cognitive training of primary and secondary school children, etc. Comprehending the internal structure and operational mechanism of executive functions holds great significance for researching individual cognitive processes. In 2000, Miyake et al. put forward the dissociated and associated model of executive functions, and since then, studies on executive functions have all been based on this model. However, this model fails to fully elucidate the internal structure and operational mechanisms among the subfunctions of executive functions, making it challenging to explain the reasons for the transfer effects of executive function training and the insignificant improvement in some executive function training. For this reason, this paper, based on the studies of the subfunctions of executive functions (inhibition, updating, and shifting) in information-related potentials and brain imaging, explores the relationships between inhibition, updating, and shifting. According to the information processing theory of cognitive processing, a hypothesis of the sequential parallel processing model of executive functions is proposed to supplement and perfect Miyake’s dissociated and associated model in order to better understand the internal relationships and functional mechanisms among the subfunctions of executive functions. In the future, this theoretical model can be further refined from the perspectives of collecting fMRI, age change in executive function development, and the proportion of subfunctions.
文摘为解决Hadoop云平台无法动态控制用户访问请求的问题,提出一种基于用户行为评估的Hadoop云平台动态访问控制(DACUBA,dynamic access control based on user behavior assessment)模型。该模型首先实时收集用户指令序列,通过并行指令序列学习(PCSL,parallel command sequence learning)获取用户行为轮廓。然后利用前向轮廓建立全局K模型,对后续行为序列进行分类并对分类结果进行评估。随后将评估结果与改进Hadoop访问控制机制结合,使云平台用户的访问权限随自身行为动态改变。最后通过实验验证了模型算法的有效性和动态访问控制机制的可行性。
文摘Most DNA shuffling methods currently used require PCR process. A novel method of DNA shuffling without PCR process is described, taking advantage of the feature of some restriction enzymes whose recognition sites differ from their cleavage sites, thus giving rise to different cohesive ends.These cohesive ends can be rejoined at their native sites from different parental sequences, generating new sequences with various combinations of mutations.
