Adaptive learning is a new approach for e-learning systems. In comparison to traditional e-learning systems, which present same things for all learners, these systems automatically adapt with learner characteristics. ...Adaptive learning is a new approach for e-learning systems. In comparison to traditional e-learning systems, which present same things for all learners, these systems automatically adapt with learner characteristics. In this paper, we are going to propose a new method for Adaptive learning, and consider adaptation from three viewpoints: 1) learner learning style, 2) learner’s knowledge level, 3) learner’s score. Due to similarity between learning objects graph and petri net, and In order to provide adaptive learning, we use an approach based on a high level petri net (HLPN).Also we propose a method to evaluate performance in this system. We compare our system with a non adaptive system, through our performance evaluating method. The results show response time for our system is less than non adaptive system and learners finish course in a relatively shorter period of time. Since our proposed system considers individual features of learner, we can be sure that learner would not be confused in learning materials.展开更多
A fine grained distributed multimedia synchronization model——Enhanced Fuzzy timing Petri Net was proposed which is good at modeling indeterminacy and fuzzy. To satisfy the need of maximum tolerable jitter, the suffi...A fine grained distributed multimedia synchronization model——Enhanced Fuzzy timing Petri Net was proposed which is good at modeling indeterminacy and fuzzy. To satisfy the need of maximum tolerable jitter, the sufficient conditions are given in intra object synchronization. Method to find a proper granularity in inter object synchronization is also given to satisfy skew. Exceptions are detected and corrected as early as possible using restricted blocking method.展开更多
指出在高速铁路牵引供电系统故障诊断中应计及所获取的保护和开关动作信息的不确信性和模糊性,基于此,将模糊Petri网(fuzzy Petri net,FPN)应用于牵引供电系统的故障诊断。考虑到牵引供电系统保护的特殊性,进行了第2次推理;针对越区供...指出在高速铁路牵引供电系统故障诊断中应计及所获取的保护和开关动作信息的不确信性和模糊性,基于此,将模糊Petri网(fuzzy Petri net,FPN)应用于牵引供电系统的故障诊断。考虑到牵引供电系统保护的特殊性,进行了第2次推理;针对越区供电时馈线远后备保护覆盖元件多的特点,增加了推理条件以保证推理的正确性;根据供电臂故障特征,给出了供电臂故障区间判别规则。算例分析结果表明,牵引供电系统的模糊Petri网故障诊断方法简洁、推理直观,能够在不确定或信息缺失的情况下,提高故障区域判断的确信性。展开更多
文摘Adaptive learning is a new approach for e-learning systems. In comparison to traditional e-learning systems, which present same things for all learners, these systems automatically adapt with learner characteristics. In this paper, we are going to propose a new method for Adaptive learning, and consider adaptation from three viewpoints: 1) learner learning style, 2) learner’s knowledge level, 3) learner’s score. Due to similarity between learning objects graph and petri net, and In order to provide adaptive learning, we use an approach based on a high level petri net (HLPN).Also we propose a method to evaluate performance in this system. We compare our system with a non adaptive system, through our performance evaluating method. The results show response time for our system is less than non adaptive system and learners finish course in a relatively shorter period of time. Since our proposed system considers individual features of learner, we can be sure that learner would not be confused in learning materials.
文摘A fine grained distributed multimedia synchronization model——Enhanced Fuzzy timing Petri Net was proposed which is good at modeling indeterminacy and fuzzy. To satisfy the need of maximum tolerable jitter, the sufficient conditions are given in intra object synchronization. Method to find a proper granularity in inter object synchronization is also given to satisfy skew. Exceptions are detected and corrected as early as possible using restricted blocking method.
文摘指出在高速铁路牵引供电系统故障诊断中应计及所获取的保护和开关动作信息的不确信性和模糊性,基于此,将模糊Petri网(fuzzy Petri net,FPN)应用于牵引供电系统的故障诊断。考虑到牵引供电系统保护的特殊性,进行了第2次推理;针对越区供电时馈线远后备保护覆盖元件多的特点,增加了推理条件以保证推理的正确性;根据供电臂故障特征,给出了供电臂故障区间判别规则。算例分析结果表明,牵引供电系统的模糊Petri网故障诊断方法简洁、推理直观,能够在不确定或信息缺失的情况下,提高故障区域判断的确信性。
