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This paper analyses how the high-speed rail construction in Northeast Japan (Tohoku) has affected total demand and interregional travel patterns. We use annual interregional passenger data from 1989 to 2012 and apply regression analysis with the demand between Tokyo and the Tohoku prefectures as the dependent variable. We distinguish particularly between the ‘Full-’ and the ‘Mini-’ Shinkansen, where the latter are branch services running with reduced speed. We find that the ‘Full-Shinkansen’ quickly increases rail and total public transport trips and generates additional rail demand year on year. The ‘Mini-Shinkansen’ impacts are less pronounced. Furthermore, our analysis shows that the Shinkansen has shifted some demand from air to rail once it started operation and increased rail share gradually. We therefore suggest that predictions of demand impacts should carefully distinguish immediate from gradual impacts. We also discuss differences in regional demand in that not all prefectures have gained equally from Shinkansen construction. 相似文献
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Tomohiro Nakamura Susumu Ota Yoshiyuki Nakajima 《Journal of Marine Science and Technology》2001,6(1):3-12
The appearance of a number of large container ships in the 8000 TEU range raises the importance of a plan for container lashing
arrangements on deck in relation to the design of the ship. Therefore, it is expected that a new method for evaluating the
lashing arrangements on deck will be introduced which is applicable regardless of the ship's size and the lashing pattern,
instead of using the standards of several different societies, as happens at present. To evaluate the lashing arrangements
on deck, the expected maximum values of the forces acting on the containers and lashing rods should be evaluated. This paper
presents a new method of evaluating the container lashing arrangements on a container ship using an "acceleration ellipsoid."
The applicability of the acceleration ellipsoid to an evaluation of the expected maximum values of the forces was examined
by comparing the expected maximum values of the forces calculated by the long-term distribution calculation known as the "Fukuda
method," to those calculated using the acceleration ellipsoid. By comparing these results, it was confirmed that the expected
maximum values of the forces calculated using the acceleration ellipsoid were not less than those calculated through by the
long-term distribution calculation. It is concluded that the acceleration ellipsoid can be used to evaluate the expected maximum
values of the forces acting on containers and lashing rods.
Received: December 14, 2000 / Accepted: March 22, 2001 相似文献
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Improving pedestrian safety at intersections remains a critical issue. Although several types of safety countermeasures, such as reforming intersection layouts, have been implemented, methods have not yet been established to quantitatively evaluate the effects of these countermeasures before installation. One of the main issues in pedestrian safety is conflicts with turning vehicles. This study aims to develop an integrated model to represent the variations in the maneuvers of left-turners (left-hand traffic) at signalized intersections that dynamically considers the vehicle reaction to intersection geometry and crossing pedestrians. The proposed method consists of four empirically developed stochastic sub-models, including a path model, free-flow speed profile model, lag/gap acceptance model, and stopping/clearing speed profile model. Since safety assessment is the main objective driving the development of the proposed model, this study uses post-encroachment time (PET) and vehicle speed at the crosswalk as validation parameters. Preliminary validation results obtained by Monte Carlo simulation show that the proposed integrated model can realistically represent the variations in vehicle maneuvers as well as the distribution of PET and vehicle speeds at the crosswalk. 相似文献
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John Jowhell Villegas Wael K.M. Alhajyaseen Hideki Nakamura Azusa Goto 《国际交通安全学会研究报告》2018,42(4):230-239
Signalized intersections are one of the key elements that play a vital role at road networks. The efficiency and safety levels of intersections can affect the operational performance of the whole system. In general, turning traffic, especially median-turning, has always been considered as the most problematic movement in the operation of intersections. This becomes more critical with high turning demand where exclusive turning lanes (single or double) can be assigned to provide larger capacities for these movements and to reduce conflicts with through traffic. However, improper treatment of median-turn lanes could create cross-maneuvering behavior which may limit the expected increase in capacity and create safety issues. Median-turning lane markings are commonly provided at intersections in Japan to guide drivers while turning which is expected to reduce the conflicts among turning traffic. Meanwhile, in the Philippines, exclusive median-turn lanes are installed at intersections without proper treatment which may contribute to the low mobility and safety levels. Therefore, this study evaluated the impact of inside intersection lane markings on the operation of median-turn lanes in terms of mobility and safety. The vehicle maneuver, speed and interactions between the turning traffic were utilized as essential components for the assessment. The empirical analysis shows that conflicting trajectories were present on double turn lanes without median-turn lane markings in the Philippines, which resulted to serious conflicts among the turning vehicles and negatively influenced the turning speed and saturation flow rate of the turn lanes. On the other hand, the turn lane markings in Japan, provided a positive impact to mobility and safety of the turning lanes. Moreover, it was also found that the geometric characteristics and traffic signal phasing scheme highly affects the capacity and safety condition of signalized intersections. 相似文献
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This paper analyzes the implementation of Japan's and Indonesia's national frameworks aiming to promote sustainable urban mobility by placing transport policy coordination as pre-requisites under the decentralization regime. It takes two cities, Matsuyama and Yogyakarta, as the case studies. The analytical framework developed here highlights multi-level government coordination, coordination among local stakeholders, and regulator–operator coordination. The analysis is based on policy documents review, field observation, hearing and a questionnaire survey. The study shows some good practices as well as drawbacks of the schemes and produces lessons-learned from Japan's ‘omnibus town scheme’ to improve Indonesia's public transport program and for other cities in developing countries. 相似文献
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Efforts are underway in Japan to promote “Smartway” next-generation roadways, which provide a variety of services through the use of advanced ITS technologies. In recent years, the National Institute for Land and Infrastructure Management (NILIM), part of the Ministry of Land, Infrastructure, Transport and Tourism (MLIT), has conducted public-private joint research on next-generation road services using ITS technologies. Field operational tests (FOTs) of services including forward obstacle information provision and merging assistance using 5.8 GHz dedicated short range communication (DSRC) were conducted on the Tokyo Metropolitan Expressway through FY2007. In FY2008-2009, FOTs were conducted in three major metropolitan areas—Tokyo, Nagoya, and Keihanshin (Kyoto, Osaka, and Kobe)—to promote future deployment nationwide. These included tests of information provision services to alert drivers to forward obstacles hidden beyond the crest of an incline and prevent excessive speed on sharp curves. This paper presents an overview of these FOTs conducted by NILIM in recent years and their results. 相似文献
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Among various pedestrian facilities, signalized crosswalks are the most complex and critical ones. Their geometry and configuration including width, position and angle directly affect the safety, cycle length and resulting delays for all users. Existing manuals do not provide clear and rational specifications for the required crosswalk width under different pedestrian demand combinations and properties. Furthermore, they do not consider the bi-directional flow effects on crossing speed and time when addressing pedestrian flow at signalized crosswalks. However, quantifying the effects of such interactions on the behavior of pedestrian flow is a prerequisite for improving the geometric design and configuration of signalized crosswalks. The objective of this paper is to develop a methodology for estimating the required crosswalk width at different pedestrian demand combinations and a pre-defined LOS. The developed methodology is based on theoretical modeling for total pedestrian platoon crossing time, which consists of discharge and crossing times. The developed models are utilized to generate the fundamental diagrams of pedestrian flow at signalized crosswalks. A comprehensive discussion about the effects of bi-directional flow and various pedestrian age groups on the characteristics of pedestrian flow and the capacity of signalized crosswalks is presented. It is found that the maximum reduction in the capacity of signalized crosswalks occurs at roughly equal pedestrian flows from both sides of the crosswalk. By utilizing existing LOS thresholds for pedestrian flow at signalized crosswalks, the required crosswalk widths for various pedestrian demand combinations are proposed for implementation. 相似文献
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制定桥梁维修管理计划是一项非常繁杂的工程优化难题,使用常用的优化算法很难取得满意的结果。利用耐荷性和耐久性作为桥梁的健康指数,考虑维修方案和维修费用的问题,用费用最小化和品质最大化2种方案建立了桥梁维修管理的优化模型。探讨利用粒子群优化算法(PSO)求最优桥梁维修管理计划的解的可能性,并与作者开发系统中的遗传算法(SGA)和免疫遗传算法(IA)进行了比较,运用多样度的概念说明了粒子群优化算法(PSO)在解决这类问题的先进性。结果表明,粒子群优化算法(PSO)对于桥梁维修管理计划的优化是一种普适高效的算法;而且,考虑维修的管理期间越长,应用粒子群优化算法求解问题收敛性与其他2种方法相比显得更好,得到准最优解的频率也更高。 相似文献
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