舰载火箭弹及其制导技术

本文从提高舰载火箭弹的命中精度出发，介绍了其简易制导系统的基本原理物和现有技术，提出了一种基于GPS（全球定位系统）／INS（惯性）组合制导和火药脉冲助推器控制的简易制导方案，分析了其工作过程和关键问题。     

A dynamic analysis of person and household activity and travel patterns using data from the first two waves in the Puget Sound Transportation Panel

Daily activity participation and travel patterns are examined using data from the Puget Sound Transportation Panel (PSTP), which contains two-pairs of daily travel diary information (wave 1 in 1989 and wave 2 in 1990). Summary data of the travel diaries at the person and household levels are obtained using cluster analysis. At the person level, four clusters are found reasonable for both activity and travel. The four-cluster solutions indicate substantial day-to-day variation in activity participation and similarity in travel behavior over time. Temporal changes are analyzed using contingency table methods and log-linear models. The analysis reveals that activity participation and mobility present many regularities over time. Transitions within each wave show strong dependence between two days for both activity and travel, with higher dependency for the travel patterns than for the activity patterns. These are consistent when the analysis focuses on a longer period such as a year. Temporal dependencies appear to be stronger in the household-based than the person-based analysis. A hierarchical structure is also found in the relationship between activity and travel clusters. The link between activity and travel is much stronger within a day, weaker from one day to another, and the least strong from one year to the next. Important irregularities, however, are found and may be due to scheduling time-frames adopted by the respondents that are only partially captured in the data used.     

智能停车诱导系统的设计

由信息采集、信息传输、信息处理和信息发布四个模块构成,以Spce061a单片机作为中央处理器设计的智能停车诱导系统,实现了停车场及其泊车车位信息的及时发布,能引导驾驶员可靠高效地找到合适的停车场.     

基于.Net的工厂方法模式研究与应用

设计模式简单方便地复用成功的模式和体系结构,使新系统开发者更加容易理解其设计思路。设计模式中的工厂方法模式为系统结构提供了非常灵活强大的动态扩展机制,本文阐述了工厂方法模式的体系结构以及工厂方法模式在软件开发中的具体应用。     

铁路综合客运枢纽静态导向标志版面设计方法

由于铁路综合客运枢纽静态导向标志系统设计缺乏相关规范、标准和指导方法,其标志版面设计存在不统一、系统性差等问题。首先对枢纽内旅客行为特性进行分析,总结旅客的视觉和认知特性,采用视频调查法调查分析旅客在公共换乘区和站台区域自由流状态下的步行速度分布特征。基于标志颜色理论、现有标志规范、文字字高计算模型以及国内外标志应用情况和研究成果,从标志版面的颜色、图形、文字、形状及布局5个方面展开探讨,提出铁路综合客运枢纽静态导向标志版面设计方法。     

Optimal assignment for check-in counters based on passenger arrival behaviour at an airport

Establishing how to utilize check-in counters at airport passenger terminals efficiently is a major concern facing airport operators and airlines. Inadequate terminal capacity and the inefficient utilization of facilities such as check-in counters are major factors causing congestion and delays at airport passenger terminals. However, such delays and congestion can be reduced by increasing the efficiency of check-in counter operations, based on an understanding of passengers' airport access behaviour. This paper presents an assignment model for check-in counter operations, based on passengers' airport arrival patterns. In setting up the model, passenger surveys are used to determine when passengers arrive at the airport terminals relative to their flight departure times. The model then uses passenger arrival distribution patterns to calculate the most appropriate number of check-in counters and the duration of time that each counter should be operated. This assignment model has been applied at the Seoul Gimpo International Airport in Korea. The model provides not only a practical system for the efficient operations of time-to-time check-in counter assignments, but also a valuable means of developing effective longer-term solutions to the problem of passenger terminal congestion and delays. It also offers airlines a means of operating check-in counters with greater cost effectiveness, thus leading to enhanced customer service.     

基于出行特征的用地类型推断方法研究

提出一种基于卷积神经网络推测城市交通小区内用地特征的算法，同时对交通小区内多种用地类型进行预测.选用公共交通出行数据集和网约车出行数据集，融合多种出行方式的出行特征对交通小区内用地特征刻画.提取交通小区内发生强度，吸引强度和产吸差强度3个指标作为模型输入，训练得到基于区域内出行特征双通道的卷积神经网络模型，采用网格寻优方法确定最优网络结构.选取北京市六环内交通小区作为研究对象，结果表明，本文算法能够同时推断交通小区内居住、工作和休闲用地特征，并获得各用地类型在小区内占比分布.     

Cooperative path following control of UAV and USV cluster for maritime search and rescue北大核心CSCD

［Objectives ］ This paper studies a three-dimensional (3D) cooperative path-following control problem in the process of maritime search and rescue for a heterogeneous unmanned cluster system composed of unmanned aerial vehicles (UAVs) and unmanned surface vehicles (USVs).［Methods ］ First, kinematic models of the UAVs and USVs are established under a fixed coordinate system and body coordinate system. In order to design a 3D path-following controller suitable for motion control, an air coordinate system is established, and the path tracking error models of the UAVs and USVs are established in the Serret-Frenet coordinate system. Next, a 3D line-of-sight (LOS) guidance law is designed at the kinematic level, and a cooperative path-following control method suitable for heterogeneous clusters of marine vehicles is proposed, allowing the UAVs and USVs to track the preset parameterized path. Finally, the stability of the control system is analyzed based on the Lyapunov stability theory.［Results］The simulation results verify the effectiveness of the proposed cooperative path-following control method for heterogeneous clusters of marine vehicles.［Conclusions］The results of this study can provide references for maritime search and rescue by using the proposed cooperative path-following control method. © 2022 Journal of Clinical Hepatology. All rights reserved.     

UML在油压减震器计算机测试系统中的应用

应用UML对油压减震器计算机测试系统进行面向对象的描述和建模,从问题域出发,定义问题和解决问题.通过使用UML的图形,先从系统的软硬件边界、系统服务、操作者与系统交互的角度去发现对象,根据对象定义类,然后使用VC++完成程序设计.UML对油压减震器计算机测试系统的描述应用于从需求分析到程序实现、程序测试的整个软件过程.     

模拟导弹制导的交通系统路径诱导算法

模拟导弹制导的单车诱导算法利于交通系统优化目标（车流量平衡目标）.为避 免多车诱导导致的交通拥堵,以模拟导弹制导的单车诱导算法为基础,提出了模拟导弹 制导的交通系统路径诱导算法.按照出行需求,对模拟导弹制导的时间最短路径算法进行 改进,使算法满足各类单车路径规划目标,以提高单车诱导接受率.系统路径诱导算法以 交通系统优化为最终目标,对超出路网通行能力的诱导进行修正,使交通流运行趋势符 合驾驶员出行需求.建立系统优化评价指标和系统诱导接受率指标,并以北京部分地区为 例进行仿真.仿真结果表明,算法能够达到系统优化目标,同时保证了较高的系统诱导接 受率.