基于API函数的模拟终端串行通信设计

通过对模拟终端串口通信设计的介绍,阐述在Windows 9X/NT操作系统中,API函数和多线程技术在串行通信中的应用.该方法能更加灵活、高效地控制串口操作.     

Analysis of solution findings in the conceptual design of function structures

In the conceptual stage the function design process is realized by the computer aided application. After surveying on the function specification methods and the function modeling, a computer aided function design environment is analyzed. Subsequently based on a module library and principle catalogue, a solution finding process as a part of conceptual design is proposed for a creative design. In addition, a search algorithm to find the solution of adaptable function structure is also discussed. The concepts proposed in this paper can support the subsequent design stages, especially simulation for checking the function structure defects.     

十年磨一剑——铁路运输管理信息系统(TMIS)建设纪实

回顾运输管理信息系统(TMIS)建设的10年奋斗历程,简明扼要地介绍TMIS实现的功能,并畅想了铁路运输管理信息系统的发展方向.     

铁路信息服务管理系统的功能与特点

提高信息服务质量,离不开必要的工具.市场上的工具功能不全面,系统开销大,不够适用.铁路信息部门从信息系统运营实际需要出发,开发了自己的信息服务管理系统.功能全面,简约适用,系统开销小,克服了通用系统的弊病,具有突出的优点.     

Institutions Shaping Coastal Ecosystems: The Algarve Case

Water and land use have changed dramatically over the last thirty years in Southern European coastal zones. For climatic and economic reasons coastal tourism development is often accompanied by simultaneous intensification of agricultural activity. The literature highlights a number of emerging resource pressures. The intensity of land use, excessive infrastructure development, and overexploitation of water resources pose the primary problems. Unsustainable development is often ascribed to mal-performing institutions (e.g., environmental management and land use planning), but there is a lack of studies analyzing the way in which institutions contribute to the problem. We address this gap by devising an analytical strategy that combines function analysis with the analysis of governance structures, property rights, and actors. This strategy is applied to the analysis of changes in ecosystem functions of the Portuguese coastal zone of the Algarve between the mid-eighties and today. Based on the analysis we call for an improvement of the performance of formal institutions in the Algarve. Actors in charge of implementing reformed institutions have to be given the financial and human means to implement formal property rights. Furthermore, entitlements for resource exploitation and interconnected transactions should not anymore be taken for granted. Specifically, institutions to control land use should be made more effective and incentives, that exclusively promote development, such as the construction tax, need to be questioned.     

Measuring crowding-related comfort in public transport

ABSTRACT

In this paper we focus on the estimation of crowding in public transport – specifically urban rail systems – and its effect on perceived comfort. It is different from similar studies in the method it employs for estimating crowding levels in vehicles. Specifically, we formulate a function of time and location, which uses only passenger embarking data to estimate the number of passengers in vehicles. Then we convert the estimated crowding values into perceived discomfort levels by trip section. Our method depends on hourly seasonality assumptions but provides good estimates of crowding in urban rail systems even when passenger alighting data is not available. We illustrate the implementation of our model with the example of the Istanbul Metro system.     

水下单层圆柱壳振动声辐射预报的测点布置改进方法

为解决水下单层圆柱壳结构振动声辐射预报中的测点布置问题,本文提出一种测点布置改进方法——均匀子集随机选取测点方法。该方法将所有待选测点分成相互独立的均匀子集,然后从各个子集中随机选取一个测点,再通过目标函数对每组测点进行评价,从而选择出好的测点组合。通过与均匀布置方法得到的振动声辐射预报结果对比表明,本文提出的均匀子集随机选取测点方法不仅保证较高的振动声辐射预报精度,且避免均匀布置方法中测点选择的主观性和盲目性,是一种优秀的测点布置方法。     

两栖车辆非线性横摇阻尼系数估计

为了估计两栖车辆非线性横摇阻尼系数,根据能量法提出了能量损耗函数概念,并根据两栖车辆自由横摇衰减曲线确定实验的能量损耗函数,再采用最小二乘法来确定非线性阻尼系数.为了考察该方法的有效性,通过数值仿真的方法生成模拟自由横摇衰减曲线,采用提出的方法预报了不同初始条件下的阻尼系数,最后根据两栖车辆的自由横摇衰减曲线,估计了平方型的阻尼系数.结果表明该方法精度高、操作简单,不但适用于小角度横摇,而且适用于大角度横摇.     

一种基于核函数法的步行需求预测方法

步行需求预测对于步行系统的发展及规划非常重要，在概略规划方法的基础上，通过分析步行出行的相关特征，引入核密度函数法表达步行出行特征，形成基于核密度函数的步行需求预测方法，通过对中山市主城区的实际应用，方法具有较好的可操作性。