Use of public information for road-capacity reductions: a study of mediating strategies during tunnel rehabilitations in Oslo

Transportation - In this paper, two public information campaigns were analysed. These were related to capacity reductions, caused by maintenance work, in two main road tunnels—at Smestad and...     

Ludwig?s Ratchet and the Collapse of New England Groundfish Stocks

The stocks of principal groundfish species off New England have collapsed, creating economic hardship and dislocation in fishing communities from Rhode Island to Maine. In this article we analyze the causes of this collapse using the ?ratchet effect? described by Ludwig, Hilborn, and Walters (1993) as a framework. According to Ludwig, Hilborn, and Walters, powerful economic and political interests drive fisheries to overcapitalize and overexploit despite scientific evidence that stocks are declining. When the fishery is no longer economically viable, governments provide financial assistance to minimize economic hardship. When stocks increase there is another rush to invest, and the cycle repeats itself. The history of groundfish management in New England conforms well to this model. Optimism among fishers and government over U.S. control of this fishery in 1977 stimulated successive rounds of investment that built up excessive fishing capacity despite warnings from scientists that stocks were becoming weaker. Management regimes designed by the New England Fishery Management Council were ineffective in constraining fishing effort. Collapse of the stocks has led to severe restrictions on fishing and to government assistance. We suggest that the integration of science, management, and harvesting sectors through ecosystem-based management offers the best means of avoiding similar situations in the future.     

China shipbuilding management challenges in the 1980s

Since the economic reforms in the late 1970s, the shipbuilding industry in China has enjoyed rapid growth. Over the past two decades, many new building contracts have been won and successfully completed. However, some shipyards have also suffered great losses. Basing on their experience in Southern China, the authors examine some of the major challenges that Chinese shipbuilders faced during this transitional period, when the industry ventured into the international market. These challenges are broadly categorized into two areas: (i) external factors, such as inflation and infrastructural support that the shipbuilder had no control over, and (ii) shipbuilding management, which the shipbuilder had to master in order to gain competitive advantage. Suggestions on how these problems could be tackled are discussed.     

Port performance in Asia: Does production efficiency imply environmental efficiency?

Atmospheric and water pollution are two main sources of negative environmental externalities generated by shipping. This study recognizes the negative externalities in the production of port services in East Asia by explicitly incorporating environmental impacts of shipping. Programming techniques are used to analyze 156 Origin–Destination pairs between 13 major East Asian ports, to derive the externality-augmented measures of port productivity and efficiency at the waterside. The results suggest that the inclusion of externality mitigation strategies can exert a considerable influence on efficiency performance.     

“互联网+智能交通”市场进入发展黄金期

正1城市智能交通下一个创新风口统计结果显示,我国一线城市私家车保有量年平均增速达到20%。有限的城市土地供应和快速增长的城市交通需求之间的矛盾日益凸显。根据高德地图的研究,相比2015年,2016年调研的45座主要城市中有80%的城市延时拥堵指数加重。其中,北上广深的出行高峰时期平均每小时拥堵时间长达29 min,对于出行居民的个人年拥堵成本达到9 500元,相当于个人年均收入的     

Requirement-based testing of an automotive ECU considering the behavior of the vehicle

HILS (Hardware In the Loop Simulation) and RBT (Requirement-Based Testing) are widely used to evaluate the performance and reliability of automotive ECUs (Electronic Control Units). The HILS method is used to predict the behavior of ECU-installed vehicles and to evaluate the performance of ECU controllers. RBT evaluates whether the embedded system satisfies the pre-defined requirements. In this study, the behavior of a vehicle is regarded as a system requirement, and an embedded system test procedure that evaluates the system requirement is proposed. In particular, a new method is introduced, which integrates HILS with RBT. Using the proposed method, the behavior of an articulated vehicle equipped with an AWS (All Wheel Steering) ECU is evaluated with RBT software.     

道德与海员职业--论海员培训中的伦理学教育以及道德决定的策略

引言在对海员的职业培训中 ,有关如何作出符合伦理道德的决定的培训也应当包括其中。当我们在对他们进行传统的如轮机、航海、人员管理以及通讯等培训时 ,不要忘记 ,教给他们有关道德和道德思维的基础知识同样重要。在这个竞争激烈、全球一体的商业世界中 ,我们必须承认这样一句格言 :成功的商人必为有德者。所以 ,对海员的培训 ,既应当教给他们有关伦理道德的历史 ,还应进行具体的案例学习 ,更重要的是 ,应通过有关范例的讨论和学习 ,使他们掌握进行道德决定的模式和方法 ,并指明解决问题的方向。对此 ,位于缅因州的国际道德研究院的Ｒｕｓ…     

Biases in response over time in a seven-day travel diary

Data from multi-day travel or activity diaries might be biased if recording inaccuracies and tendencies for respondents to skip certain types of trips or activities increases (or decreases) from day-to-day over the diary period. One objective of the research reported here is to test for such temporal biases in a seven-day travel diary. A second objective is to calculate correction factors which can be applied to the data in the case that biases are found. The analyses were conducted using regression and analysis-of-variance techniques. The variables investigated included total trips per day, total travel time per day, and trips per day by various modes (such as walking, car driver and car passenger). Results showed that most biases per capita statistics are due to increases over time in the percentage of respondents reporting no travel at all for an entire day. However, even after accounting for this bias by measuring statistics in terms of per mobile person, there remains a decrease over time of about 3.5 percent per day in the reporting of walking trips. This appears to be the main factor in the overall bias of about one percent per day in total trips per mobile person per day. No significant differences were found among population segments in terms of the levels of their biases.     

轮-轴组件的三维弹性接触分析

本文根据接触问题的参变量最小势能原理,建立了接触问题的有限元参数二次规划解,并以RE_2型车轴为例,按三维接触模型进行了计算分析。