Modeling the cost of bird strikes to US civil aircraft

The objective of our analysis is to develop a model of damage costs that arise from collisions between aircraft and birds, based on data drawn from the Federal Aviation Administration National Wildlife Strike Database (NWSD). We develop a two-part model, composed of two separate statistical models, that accounts for the effects of aircraft mass category, engine type, component of the aircraft struck, and the size and number of birds struck. Our results indicate the size of bird, number of birds, and engine ingestions are the largest determinants of strike-related costs. More generally, our result is a model that provides a better understanding of the determinants of damage costs and that can be used to interpolate the substantial amount of missing data on damage costs that currently exists within the NWSD. A more complete accounting of damage costs will allow a better understanding of how damage costs vary geographically and temporally and, thus, enable more efficient allocation of management resources across airports and seasons.     

浅谈高速公路收费员管理的误区及改进措施

文章分析了目前大多数高速公路公司在收费员管理上存在的误区,并结合收费员的工作特点,提出了针对性的改进措施,同时介绍了广西坛百高速公路有限公司收费员管理的经验做法。     

出租车合乘

车辆合乘是交通需求管理中的一项措施。交通需求管理,即引导人们采取科学的交通行为,理智地使用（不滥用）道路设施的有限资源。交通需求管理的主要措施遍布在交通行为的各个阶段,其中,组织汽车合乘作为出行方式阶段的措施已经被许多专家、学者提了出来。     

浅谈高速公路桥梁管理系统外业数据的采集

介绍了桥梁管理系统外业数据采集的过程、方法与步骤。     

浅谈公路桥梁的安全管理

阐述了公路桥梁的安全管理的关键环节,从领导重视、规范桥梁管理、加大巡查、搞好养护、维修、管护等对沧州桥梁的安全管理进行了介绍。     

The use of GIS and relational database management systems to improve the scheduling operations of paratransit

The scheduling operations of many paratransit agencies in the United States are undertaken manually. Those customers who are eligible to travel call in their requests the day before the trip is needed. As the trip requests are received, they are entered into a list of unscheduled trips. In order to schedule these trips, the scheduler must first determine the number of drivers and shuttle buses that are available as well as the time of availability of each. The scheduler must then try to match the rides that are in “similar” areas around the “same” time to place together on the driver's schedule. As new trip requests are made, the schedulers must adjust the trips that are already scheduled to try and schedule as many trips as possible in the most efficient way.

By developing a system that would improve the scheduling system operations of, in this case, DART (Delaware Administration for Regional Transit) First State Paratransit, customers can expect to receive better service that will improve their ability to travel throughout the community. Some devices that could also improve the operations of paratransit agencies are described in this paper, such as satellite‐based Global Positioning System (GPS), radio communication systems, mobile computers, radio frequency‐based data communication systems, internet web pages, automated paratransit information systems, and card‐based data storage and transfer media. However, because paratransit systems are difficult to operate cost‐efficiently, the optimum and most cost‐efficient device must be selected. The system chosen for DART First State Paratransit includes the use of a relational database management system (RDMS) and a transportation Geographic Information System (GIS). RDMS keeps track of the database information as well as the scheduled trips and the GIS is ideal for analyzing both geographic and temporal data. This system is shown to be superior to the manual system.     

基于项目管理模式的EAP研究

EAP作为企业提供给员工的一项精神福利,已逐步纳入中国企业的人力资源体系,但在本土化的过程中举步维艰。文章通过对EAP如何进行项目化管理进行探讨,分析EAP项目在各环节的实施内容、控制要点,希望能够对EAP服务机构有所借鉴,促进行业可持续健康发展。     

Time to burn: Flight delay,terminal efficiency,and fuel consumption in the National Airspace System

Improved Air Traffic Management (ATM) leading to reduced en route and gate delay, greater predictability in flight planning, and reduced terminal inefficiencies has a role to play in reducing aviation fuel consumption. Air navigation service providers are working to quantify this role to help prioritize and justify ATM modernization efforts. In the following study we analyze actual flight-level fuel consumption data reported by a major U.S. based airline to study the possible fuel savings from ATM improvements that allow flights to better adhere to their planned trajectories both en route and in the terminal area. To do so we isolate the contribution of airborne delay, departure delay, excess planned flight time, and terminal area inefficiencies on fuel consumption using econometric techniques. The model results indicate that, for two commonly operated aircraft types, the system-wide averages of flight fuel consumption attributed to ATM delay and terminal inefficiencies are 1.0–1.5% and 1.5–4.5%, respectively. We quantify the fuel impact of predicted delay to be 10–20% that of unanticipated delay, reinforcing the role of flight plan predictability in reducing fuel consumption. We rank terminal areas by quantifying a Terminal Inefficiency metric based on the variation in terminal area fuel consumed across flights. Our results help prioritize ATM modernization investments by quantifying the trade-offs in planned and unplanned delays and identifying terminal areas with high potential for improvement.     

TBZKⅡ型驼峰作业管理机的设计

驼峰作业管理机是编组站自动控制系统的重要组成部分,本文对驼峰作业管理机的系统结构、功能、设计原则和实现方法进行了介绍.     

铁道列车制动限速

阐明并确立铁道列车紧急制动限速与常用制动限速的涵义、影响因素、核定依据以及不同的确定方式。通过铁道列车紧急制动距离限值与紧急制动限速的数学关系,可以求解不同条件下的列车紧急制动限速值。建立铁道列车紧急制动限速的简化经验公式,并给出各种既有列车特定的相关经验系数。基于常用制动时列车总减速力等于零的极限约束条件,计算并绘制普通货物列车的常用制动限速图。利用图解方法得到我国普通货物列车总制动限速图以及其中的紧急制动限速与常用制动限速的分界转换线。利用相关的简化经验公式及制动限速图可以方便、准确地求出列车具体制动限速值或制订列车制动限速表。