浅谈FPGA设计中的属性标志

本文主要介绍ＦＰＧＡ设计中属性标志的加注方法，ＬＣＡ的命名规则，常用的几种属性标志，及其含义、特点和用法。     

A Rich Vein for “Reality Mining”北大核心CSSCISSCI

Arik Hesseldahl In the aftermath of the September 11 attacks, U.S. officials quickly turned their attention to other potential targets, including California's Golden Gate Bridge. What would happen if terrorists took down the bridge between San Francisco and Marin County? How much of the region would be affected and for how long?     

A heuristic approach for solving an integrated gate reassignment and taxi scheduling problem

Capacity limitation of airport ground operation is one of the major limiting factors in air traffic operation. The congestion on the gate and taxiway causes severe delay and propagate effect on the flight schedule. This paper considers the problem of integrated gate reassignment and taxiway scheduling, in which complex constraints related to runway restriction, gate allocation and taxiway conflict are all incorporated when determining the schedule. To solve this problem, we propose a novel heuristic approach. First, all possible aircraft schedules are enumerated by disretizing the waiting time along the path. Then, the cost is evaluated for each schedule and the conflict detection is conducted to generate constraint sets. Finally, we propose a set partition model, in which each decision variable denotes a candidate schedule that takes into account the possible constraints when generated. This method is compared with a sequential method that solves gate reassignment and taxiway scheduling problem separately. Computational results highlight the strength of our method.     

从艳照门看新闻自由与社会责任的冲撞

艳照门事件中，明星们私生活的不检点影响了他们自己的公众形象，但艳照门被传媒的放大，却更让人有必要探究媒体传播的价值取向。在强调新闻自由的时候更不能忘记媒体的社会责任。传媒的自由和责任，在本质上是一致的，是不可分割的。如果两者不能统一，首先必须考虑的是：新闻自由是否已经超出了应负社会责任的范围及界限。大众传播机构同样也是一种教育工具，它产生的力量或许是最大的，因此它们更必须在陈述和阐明本共同体为之奋斗的理想中，承担起教育者的责任。     

渠南灌区钢制闸门的控制改造及其腐蚀防护

从灌区节制闸安全运行需要出发，将PLC技术，计算机技术应用于闸门监控系统中，以改善闸门控制中存在的各种问题，并成为今后节制闸门监控系统发展的新方向，同时对钢闸门腐蚀问题进行研究，采取有效的防护措施，可延长闸门使用寿命。     

谈掘苴新闸工程建设的安全生产与文明工地建设

文章主要介绍了在江苏省如东县掘苴新闸工程建设中开展安全生产管理和创建文明工地活动的一些具体做法，给类似工程以借鉴。     

IS-95CDMA系统信道编码的FPGA实现

信道编码是扩频通信系统的关健技术之一，本文针对IS-95码分多址峰窝通信系统标准，介绍了一种适合于反向业务信道的信道编码的FPGA实现方案，并给出了具体的设计方法。     

Optimizing flight equencing and gate assignment considering terminal configuration and walking time

Operating airline hub-and-spoke networks (HSN) rather than direct flights among city pairs may significantly reduce supplier cost; however, passengers' travel time may significantly increase due to increased transfer and in-flight time. The costs considered in this study are hub-related and incurred by passengers and aircraft (i.e., passenger transfer, flight dwelling, and gate occupancy). The objective is to minimize the total cost by optimizing flight sequence (i.e., arrivals and departures) and gate assignment, while considering transfer speed, transfer demand, flight size, gate size and terminal configuration. A real-world HSN whose hub airport (HA) is located at Xianyang International Airport (XIY) in Xi'an, China is analyzed. The optimized solutions and their relations to various model parameters are explored.     

用户可编程门阵列

第一代的可编程逻辑器件(PLD)以1片器件代替5至10片TTL器件,最新一代可编程器件FPGA可以代替40至400片小规模集成电路。本文介绍四种可编程门阵列的基本结构和主要性能,并给出采用该类器件设计电路的编程技术。     

Stochastic optimization models for the airport gate assignment problem

Uncertainties inherent in the airport traffic may lead to the unavailability of gates for accommodating scheduled flights. Incorporating random disruptions is crucial in constructing effective flight-gate assignments. We consider the gate assignment problem under uncertainty in flight arrival and departure times and develop stochastic programming models incorporating robustness measures based on the number of conflicting flights, idle and buffer times. The proposed models are formulated as large-scale mixed-integer programming problems and tabu search algorithms are implemented to obtain assignments of reasonable quality. We conduct a computational study to analyze the proposed alternate models and show the effectiveness of the solution methods.