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261.
为克服传统遗传算法退化和早熟等缺点,同时降低优化算法的复杂度,提出基于人工免疫系统(Artificial Immune System, AIS)实现无约束多目标函数的优化。使用随机权重法和自适应权重法计算种群个体的适应值,使Pareto最优解均匀分布的同时,加快算法的收敛;通过引入人工免疫系统的三个基本算子:克隆、超变异和消亡,保持种群的多样性;在进化种群外设立Pareto 解集,保存历代的近似最优解。使用了两个典型的多目标检测函数验证了该算法的有效性。优化结果表明,基于AIS的多目标优化算法可使进化种群迅速收敛到Pareto前沿,并能均匀分布,是实现多目标函数优化的有效方法。 相似文献
262.
Over the past decade much progress has been made in the development of adaptive, model-following flight control systems. These
systems are being designed to account for the degradation and even the failure of the actuators used to implement the control
laws within aircraft. Typically, these adaptive, model-following flight control systems require software components capable
of (1) monitoring system performance, (2) quantifying changes occurring in the performance characteristics of actuators, and
(3) adapting control laws based on changes in actuator performance. Interestingly enough, the challenges facing natural immune
systems also require the successful completion of three similar tasks: (1) monitoring organism performance, (2) identification
of antigens, and (3) distribution of targeted antibodies. Thus, the characteristics inherent in natural immune systems have
been captured and employed in computational systems called artificial immune systems (AISs). This paper describes an adaptive, model-following flight control system based on an artificial immune system. The
effectiveness of the approach is demonstrated in a system designed to maintain cruise conditions in the simulation of a Boeing
747 aircraft in the presence of atmospheric turbulence and degradations in the performance characteristics of actuators used
to manipulate various control surfaces. 相似文献
263.
目的 针对宁波舟山港区的复杂航道水域与密集物流交通流,研究更加有效的调度方案,达成调度时间和等待时间最小化,即效率最大化。方法 分析宁波舟山港区航道的航行情况,提出交会处复杂航道水域存在的问题,以调度时间和等待时间最小为目标的多目标函数,建立复杂航道水域船舶调度模型。针对大量的船舶AIS数据,构建基于神经网络的航道水域调度模型,对不同类型、不同大小的船舶建立速度变化和船舶预测模型,实现对船舶调度状态的预测。设计以传统粒子群算法为基础的改良版船舶调度算法。结果 算法对模型求解表明,根据不同船长与间距可判别交通流拥挤程度进而对船舶进行调度。通过模型预测到可能产生拥挤,则应当选择小型船只走条帚门航道,大型船只走虾峙门航道,并且尽量避免产生拥堵。结论 使用该模型与算法可以有效地提升船舶调度效率,为复杂航运物流港口调度优化研究提供了一定理论基础。 相似文献
264.
Kapoor T Altenhof W Snowdon A Howard A Rasico J Zhu F Baggio D 《Accident; analysis and prevention》2011,43(4):1438-1450
This research focuses on an investigation into the head and neck injuries sustained by toddlers due to CRS misuse under frontal and side impact crashes. A fully deformable FE model incorporating a Hybrid III 3-year-old dummy was developed which has been previously validated for frontal impacts under CMVSS 208 and FMVSS 213 testing conditions. Furthermore, this model has also been validated under near-side impact conditions in accordance to crash tests carried out by NHTSA. In addition, numerical models incorporating a Q3/Q3s prototype child crash test dummies were developed. The objective of this research was to study the effect of seatbelt slack and the absence of the top tether strap on the head and neck injuries sustained by toddlers in a vehicle crash. Numerical simulations were conducted under full frontal and near side impact crash testing conditions in accordance with FMVSS 213 for the Hybrid III 3-year-old dummy and Q3/Q3s dummies in the absence and presence of slack in the seatbelt webbing, and in the absence and presence of the top tether strap. In addition, the effect of using a cross-shaped rigid ISOFIX system was also investigated. An analysis of the head and chest accelerations, neck loads and moments was completed to investigate the potential of injury due to CRS misuse. An increase in HIC15 by approximately 30–40% for the frontal impact and 10–20% for the near-side impact respectively was observed for the Q3 child dummy due to both forms of CRS misuse. In the absence of the top tether strap the forward head excursions were observed to be increased by approximately 70% for the Hybrid III 3-year-old dummy and 40% for the Q3 dummy, respectively. Use of the cross-shaped rigid ISOFIX system illustrated a reduction in head and neck injury parameters, for both frontal and side impact conditions, in the absence and presence of CRS misuse. CRS misuse results in a significant increase in injury parameters and potential for contact related head injuries. Use of a rigid ISOFIX system to restrain a CRS provides better CRS and dummy confinement and reduced injury potential than a flexible ISOFIX system. 相似文献
265.
266.
星载AIS接收系统设计及关键技术 总被引:1,自引:0,他引:1
针对星载AIS(船舶自动识别系统)接收系统覆盖范围广、运动速度快等特点,提出了三种实现信号有效接收的总体方案.采用盲分离阵列信号处理方法、非线性测频和非相干解调方法解决了星载AIS接收系统中面临的信号碰撞、多普勒频移信号解调等关键技术问题,仿真和外场实验验证了方案的有效性和可行性. 相似文献
267.
该文介绍了AIS系统中的NRZI编码及GMSK的调制解调原理和特点,在详细分析了NRZI编码过程和GMSK调制解调算法的基础上,在Matlab平台上对AIS信号进行NRZI编码,并根据正交调制和1bit差分检测算法进行了GMSK的仿真实现。程序运行结果表明,程序设计方案能正确实现NRZI编码和GMSK的调制,较好地完成... 相似文献
268.
269.
270.
Marco Marabelli Sam Zaza Silvia Masiero Jingyao Li Kathy Chudoba 《Information Systems Journal》2023,33(6):1370-1395
With this research opinion article, we aim to contribute to the ongoing conversation concerning diversity, equity and inclusion (DEI) within the IS community. Following Windeler et al.'s (2020) research on perceptions of DEI among members of the Association for Information Systems (AIS), we focus on how conferences should be convened in the post-COVID-19 era to maximise inclusivity. What are the benefits, challenges and implications of holding online and hybrid conferences? Informed by feedback from a survey involving IS scholars in the Global South and from a wide array of AIS senior scholars and conference leaders, we identify several challenges and opportunities of online and hybrid conferences (or, more generally, conferences allowing remote access) for the IS community. We weigh these tradeoffs and implications for DEI and provide reflections to generate constructive discussion on the future of AIS conferences. 相似文献