Yazar "Arslan, Turan" seçeneğine göre listele

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    Collision behaviour of double W-beam transition
    (Inderscience Enterprises Ltd, 2012) Atahan, Ali Osman; Arslan, Turan
    Vehicle collisions result in many injuries and fatalities every year all around the world. A significant number of those incidents occur outside the roadway, partly owing to the incompatibility between the roadside safety hardware and impacting vehicles. Although the purpose of using roadside safety hardware is safely to contain impacting vehicles and reduce impact severity, use of inadequate safety hardware can have serious consequences. In this study, the crash behaviour of a currently used double W-beam transition barrier was analysed and its adequacy is evaluated using a series of five vehicular impacts. Finite element simulations were used to perform the analysis, and a full-scale crash test result was used to validate the finite element models used in the study. Results of the analysis predict that double W-beam transition can safely contain and redirect vehicles ranging from compact automobiles to high centre of gravity heavy trucks up to 10,000 kg in mass. Occupant injury risk values obtained from all five cases are also calculated and presented. Further use of computational tools in safety evaluation of the existing roadside safety hardware is strongly recommended.
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    Evaluation of Organizational Problems in Urban Transportation: Antakya Example
    (Pamukkale Univ, 2011) Arslan, Turan; Murat, Yetis Sazi
    Due to overlapping jurisdictional boundaries between the city municipality and township municipalities, Antakya resembles metropolises, however its administrative and regulatory framework are not similar; this particular situation creates a serious difficulty in solving especially transportation related problems. It results in conflicts within jurisdictions between the city and township municipalities particularly on taking actions against those problems. This, moreover, creates problems and hurdles in achieving sustainable development for the city. Especially the increasing use of private cars has, recently, put burdens on non-adequate transport infrastructure and aggravated the existing problems. The increasing congestion, accidents, and environmental and social problems call for necessary decisive actions and policies. However, in order to achieve success in the actions and policies, re-organization of the administrative structure of the transport policymaking is evident. In this paper, the attention is drawn to possible changes in the organization structure considering the objectives set out clearly in 5-year development programs of Turkey as well as experiences observed in developing and developed countries.
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    A hybrid model of fuzzy and AHP for handling public assessments on transportation projects
    (Springer, 2009) Arslan, Turan
    Having an effective public participation in transportation planning and project development processes has been a major concern for developed countries. In the United States, for instance, all state Departments of Transportation are subject to the Transportation Equity Act (TEA-21) that formally requires public involvement in transportation planning. Since transportation planning involves public resources and values, judgments by the public should play a key role in determining final decisions. Therefore, all these agencies are required not only to disseminate information to the public, but also to solicit and consider public opinion in forming transportation policy. This work presents a decision support model, with public involvement and public oversight, to help policy makers select appropriate transportation projects for implementation. Since focus groups will face multiple objectives and inexact information in the process, a hybrid model of fuzzy logic and analytical hierarchy process (AHP) is proposed. A set of 'if-then' rules based on Weber's psycho-physical law of 1834 is presented to reason from fuzzy numbers to capture essential subjective preferences, pairwise, among the alternatives. The AHP is then incorporated to estimate preference allotments among alternatives. An example application of the suggested method is provided seeking public approval of an appropriate public bus transportation system choosing between one run by municipal authorities and one run by private agencies to show how this procedure works.