迭代函数系统(IFS:Iterated Function System)是构造分形图的典型方法,本文论证IFS吸引子与参数间的依赖关系,探讨了通过参数控制算法对IFS分形图进行调整的方法,实现了直观的交互式IFS参数控制系统,有效地解决了IFS分形图构造的无方向...迭代函数系统(IFS:Iterated Function System)是构造分形图的典型方法,本文论证IFS吸引子与参数间的依赖关系,探讨了通过参数控制算法对IFS分形图进行调整的方法,实现了直观的交互式IFS参数控制系统,有效地解决了IFS分形图构造的无方向性问题,使IFS分形图对自然景物的模拟更为简易和生动。展开更多
In order to effectively deal with the conflict temporal evidences without affecting the sequential and dynamic characteristics in the multi-sensor target recognition(MSTR) system at the decision making level, this pap...In order to effectively deal with the conflict temporal evidences without affecting the sequential and dynamic characteristics in the multi-sensor target recognition(MSTR) system at the decision making level, this paper proposes a Dempster-Shafer(DS) theory and intuitionistic fuzzy set(IFS) based temporal evidence combination method(DSIFS-TECM). To realize the method,the relationship between DS theory and IFS is firstly analyzed. And then the intuitionistic fuzzy possibility degree of intuitionistic fuzzy value(IFPD-IFV) is defined, and a novel ranking method with isotonicity for IFV is proposed. Finally, a calculation method for relative reliability factor(RRF) is designed based on the proposed ranking method. As a proof of the method, numerical analysis and experimental simulation are performed. The results indicate DSIFS-TECM is capable of dealing with the conflict temporal evidences and sensitive to the changing of time. Furthermore, compared with the existing methods, DSIFS-TECM has stronger ability of anti-interference.展开更多
阐述了迭代函数系统IFS(Iterated Function System)的基本理论,分析了IFS系统在表达植物形态方面的可行性,探讨了IFS对植物形态模拟的实现方法,并在实现的过程中连续地变换某一参数,有效的实现了对IFS生成植物的动态模拟,使对植物的模...阐述了迭代函数系统IFS(Iterated Function System)的基本理论,分析了IFS系统在表达植物形态方面的可行性,探讨了IFS对植物形态模拟的实现方法,并在实现的过程中连续地变换某一参数,有效的实现了对IFS生成植物的动态模拟,使对植物的模拟过程更加逼真。展开更多
为研究考虑连续刚构桥(rigid-frame bridge,RFB)不同施工阶段内力状态(internal force state,IFS)对地震易损性的影响,以一座大跨高墩连续刚构桥为背景,基于等效荷载法提出了适用于连续刚构桥施工阶段的主梁和主墩的内力等效荷载计算公...为研究考虑连续刚构桥(rigid-frame bridge,RFB)不同施工阶段内力状态(internal force state,IFS)对地震易损性的影响,以一座大跨高墩连续刚构桥为背景,基于等效荷载法提出了适用于连续刚构桥施工阶段的主梁和主墩的内力等效荷载计算公式,通过OpenSees建立了5个典型施工阶段考虑内力状态和不考虑内力状态的动力分析模型;选取40组典型的速度脉冲型近断层地震动记录为输入,采用增量动力分析法开展考虑施工过程与否的各典型施工阶段的动力时程分析,并以曲率延性系数为损伤指标,通过理论易损性方法得到了主墩墩底、墩顶和主梁根部的地震易损性曲线。结果表明:采用提出的内力等效荷载公式能较为准确地计算和模拟各典型施工阶段的等效内力状态;相同地震动强度下主墩墩底、墩顶和主梁根部在不同损伤状态下的损伤概率均随主梁悬臂长度的增加而增大;不考虑内力状态将低估墩底和墩顶的损伤概率,墩底沿纵桥向的损伤低估最为严重,且桥墩损伤概率的低估量随悬臂长度的增大而增大。展开更多
文摘迭代函数系统(IFS:Iterated Function System)是构造分形图的典型方法,本文论证IFS吸引子与参数间的依赖关系,探讨了通过参数控制算法对IFS分形图进行调整的方法,实现了直观的交互式IFS参数控制系统,有效地解决了IFS分形图构造的无方向性问题,使IFS分形图对自然景物的模拟更为简易和生动。
基金supported by the National Natural Science Foundation of China(61272011)
文摘In order to effectively deal with the conflict temporal evidences without affecting the sequential and dynamic characteristics in the multi-sensor target recognition(MSTR) system at the decision making level, this paper proposes a Dempster-Shafer(DS) theory and intuitionistic fuzzy set(IFS) based temporal evidence combination method(DSIFS-TECM). To realize the method,the relationship between DS theory and IFS is firstly analyzed. And then the intuitionistic fuzzy possibility degree of intuitionistic fuzzy value(IFPD-IFV) is defined, and a novel ranking method with isotonicity for IFV is proposed. Finally, a calculation method for relative reliability factor(RRF) is designed based on the proposed ranking method. As a proof of the method, numerical analysis and experimental simulation are performed. The results indicate DSIFS-TECM is capable of dealing with the conflict temporal evidences and sensitive to the changing of time. Furthermore, compared with the existing methods, DSIFS-TECM has stronger ability of anti-interference.
文摘为研究考虑连续刚构桥(rigid-frame bridge,RFB)不同施工阶段内力状态(internal force state,IFS)对地震易损性的影响,以一座大跨高墩连续刚构桥为背景,基于等效荷载法提出了适用于连续刚构桥施工阶段的主梁和主墩的内力等效荷载计算公式,通过OpenSees建立了5个典型施工阶段考虑内力状态和不考虑内力状态的动力分析模型;选取40组典型的速度脉冲型近断层地震动记录为输入,采用增量动力分析法开展考虑施工过程与否的各典型施工阶段的动力时程分析,并以曲率延性系数为损伤指标,通过理论易损性方法得到了主墩墩底、墩顶和主梁根部的地震易损性曲线。结果表明:采用提出的内力等效荷载公式能较为准确地计算和模拟各典型施工阶段的等效内力状态;相同地震动强度下主墩墩底、墩顶和主梁根部在不同损伤状态下的损伤概率均随主梁悬臂长度的增加而增大;不考虑内力状态将低估墩底和墩顶的损伤概率,墩底沿纵桥向的损伤低估最为严重,且桥墩损伤概率的低估量随悬臂长度的增大而增大。
