نشریه فناوری حمل و نقل
پیاپی 17 (پاییز و زمستان 1390)

Nowadays, transportation is considered as one of the most important fields of public services in any country. The more developed a country is, the more equipped is with an advanced and efficient vehicles transportation system. Accordingly, this leads to fuel-efficient use in general. Therefore, there is a strong relationship between the economic growth and the development of transportation system. The suitability of rail transport for the substantial transport market for high valued goods is limited by, among other things, the extension of the railway network and the high costs of shunting wagons into private sidings. The high fixed terminal costs and the low variable haulage costs make railways particularly suitable for large-scale transport of heavy goods over long distances. Railroads are more energy efficient than motor carriers, even when measured in terms of consumption per Ton-Km. In addition to being more energy-efficient, railroads cause less damage to the environment than trucks do. Railroads are therefore able to move large amounts of freight with less energy and less harm to the environment, compared to road vehicles. In this study, the significance of the estimate value of gasoline's demand function in the railways of our country from 1355 to 1386 is investigated to promote the utilization, the sensible exploitation of resources in the best way possible, the lifestyle of people, and reservation and protection of the energy resources for prospective use. The data are analyzed through the econometric (OLS) procedure, with reliance on the regression analysis, Excel and Eviews softwares. Based on the obtained results, the real price variable of the gasoline is not statistically significant (level of significant 0/27), also one percent increase in transported passengers leads to 0/13 growth in gasoline usage in railway sector at the same period of time.

Safety improvement in urban road networks plays an important role in transportation network efficiency. One of the most effective parameters in increasing safety is vehicle speed control that causes the improvement of safety for pedestrians and cyclists as well as decreasing the number of severe accidents. Urban planners and traffic engineers benefit from different strategies for traffic calming. In this regard, speed bumps play an important role in reduction of vehicle speed in and around intersections. The present study evaluates the performance of different types of speed bumps (made of plastic and asphalt) used in Tehran and then compares their performance in reducing vehicle speed using the empirical data. Drivers’ reaction facing speed bumps considering their ages has been another part of this research study.

All aspect of a transportation infrastructure and dynamic events along this network should be modeled in computer for providing advanced information services for both network users and managers. In this paper an efficient method would be presented which attempts to consider current governmental infrastructure and facilities in Iran. In this paper, the Arc-Node data model is used to model the physical and logical aspects of the roads, then introduce the concept of linear referencing systems and line segmentation methods which are essential for attaching road contexts to the network. In the next step, It proposes a framework for providing lane information in the Arc-Node data model. Finally the implementation details of the proposed method, which utilized Oracle relational database, would be discussed.

Regarding the increasing rate of urban population and ascending number of new vehicles in the transportation systems in mega cities, development of access roads is inevitable. Investigating the present conditions shows the use of sub ways and tunnels are appropriate for solving these kinds of problems in metropolitan areas such as Tehran. Studying the most tunnel projects in our country reveals that, the common aspect in the most of these projects is increasing the conducting time and the total cost in comparison to the premium conditions. Considering the results of this research, the selection of an inappropriate system for conducting the construction projects can be the most significant factor and the main reason of projects’ fail. This paper investigates the criteria of using appropriate conducting system for urban tunnel construction projects in Iran by studying the effective factors, the simple additive weighting (SAW) method, and the field research based on the questionnaire results (distributed between the project managers and engineers of the result tunnel in Tehran). Considering the results extracted from this research and recognizing the most effective factors can improve the managerial aspects of conducting the tunnel construction project systems in metropolitans.

Nowadays, passengers are turned into a lucrative income source for airports and airline companies. Incomes and functions of Arabian airport around the Persian Gulf (Dubai, Doha, …), concerning their weak points in comparison with Imam Khomeini airport according to the sea level, prevailing wind direction and in the most cases air distance reduction by using IKIA, shows that has an abundance potential for proper investment to achieve higher income. This research has been done through semi-organized interviews with experts and air transport managers for determining the effective parameters that led to the edition of a questionnaire in fourteen criterion which distributed among IKIA directors, commercial and aviation managers, leading airlines, air transport experts. The results were applied in the Factor Analysis portion of SPSS software that ultimately five final elements extracted to be able to set up a successful transit mode for those having a stop in this airport.

This paper is a research about optimization of the parking management system using information technology, to find smart solutions in a way drivers achieve adequate parking and the capacity of network being increased. In this regard, a population of drivers randomly selected and then by using interviews, questionnaires and case studies, the parking issues and their problems have been extracted. In the next step, by ranking the parameters, some solutions for optimizing the parking management system are introduced. Finally, the results of these studies and strategies were presented in the design of an intelligent system based on IT and cell phone network for delivering traffic services.

This study diagnoses variables of service quality in airline transportation and then investigate the relationship between these variables and customer satisfaction and customer loyalty. The sample of the study consisted of customers using the ATA Airlines domestic flights departing from Tabriz International Airport. To reach the aim of this study the researcher identified the dimensions of service quality in airline industry by surveying in literature review. Then, a questionnaire consisting of forty questions was submitted to the passengers. The researcher requested 450 respondents, who were selected through simple judgmental sampling technique to give their idea about agreement and disagreement on a likert scale. Finally, by using information extracted from the questionnaires, the effect of airline service quality or AIRQUAL (including: airline tangibles, terminal tangibles, personnel, empathy, and image) on customer satisfaction, repurchase intention, and word-of-mouth communication investigated. The analyses of data were tested through SPSS and LISREL statistical software. Results revealed that, airline tangibles, terminal tangibles, personnel, empathy, and image have significant affect on customer satisfaction. Findings also showed that customer satisfaction is positively related to repurchase and word-of-mouth intentions and repurchase intention can increase word-of-mouth communication.

Every year natural disasters cause a lot of damage to road infrastructure and many problems in disaster relief and rescue operations. Today, in many developed countries where the automatic vehicle location(AVL) can be used for emergency vehicles routing and reduction of the duration of relief. In this study, this system and its operation in disaster management in other countries were reviewed. A model was presented for subsystem in AVL for Disaster Management. The case study in this research is karaj- chaloos road. The research result shows that the important subsystems for using AVL are emergency management, traffic management, emergency vehicle, roadway & maintenance and construction management. The most important factor is communication between these subsystems. In a road, such subsystems are provided by police, road management centers, emergency centers, emergency vehicles and road administrations. This research aims to provide the communication patterns between these subsystems.