Robust flight-to-gate assignment using flight presence probabilities

In this paper we present a novel method to improve the robustness of solutions to the Flight-to-Gate Assignment Problem (FGAP), with the aim to reduce the need for gate re-planning due to unpredicted flight schedule disturbances in the daily operations at an airport. We propose an approach in which the deterministic gate constraints are replaced by stochastic gate constraints that incorporate the inherent stochastic flight delays in such a way so as to ensure that the expected gate conflict probability of two flights assigned to the same gate at the same time does not exceed a user-specified value. The novel approach is integrated into an existing multiple time slot FGAP model that relies on a binary integer programming formulation and is tested using real-life data pertaining to Amsterdam Airport Schiphol. The results confirm that the proposed approach holds out great promise to improve the robustness of the FGAP solutions.     

Predictability impacts of airport surface automation

Past evaluations of airport surface operations automation technologies have focused on capacity utilization, delay mitigation and fuel efficiency impacts. Predictability, while recognized as an important operational performance goal, has received little attention. One reason could be that applicable predictability metrics have not been developed in the context of airport surface operations management. This research fills the gap by proposing metrics for predictability performance evaluation. Using results from a SARDA human-in-the-loop simulation conducted at NASA Ames’ Future Flight Central, we present a comprehensive assessment of the predictability impacts of airport surface automation. A wide range of the impacts is considered, which includes variability in taxi-out time, predictability of take-off time and take-off sequence, entropy of the airfield state, and perceived predictability from users.     

大型钢坝闸在宁波象山大目湾闸桥工程中的应用

宁波大目湾新城位于象山中部沿海,山水资源丰富,景色优美。该文介绍了在大目湾闸桥工程中成功采用了大跨度钢坝闸的总体设计与金属结构设计。该闸桥既满足了水体隔断的功能要求,又营造了良好的工程景观,拓展了钢坝闸在景观水系中的应用范围,可供同行参考。     

基于PCI Express接口的高速数据传输系统设计

论文中提出一种高速数据传输系统的设计方案,用于提高数据采集卡中数据的传输性能.本方案基于PCI Express接口标准,利用现场可编程逻辑器件(FPGA),采用硬件描述语言Verilog HDL、模块化设计思想以及存储器直接访问(DMA)传输方式实现FPGA中的逻辑功能,最终实现数据的高速传输.经仿真与验证,本方案可行并能够满足高速数据采集卡中对数据传输部分的性能要求.     

核心路由路百兆线路接口板的设计

本文提出了一种新型的百兆以太网线路接口板。该接口板用于大型高速网络设备——核心路由器。通过设计新型的内部交换报文结构 ,用可编程逻辑硬件实现和相应的组件 ,该接口板可以满足核心路由器对百兆以太网口全双工、高速、工作稳定的要求 ,经测试丢包率很低 ,有很高的应用价值。