مهندسی عمران-راه و ترابری
Elias Zafarani; Reza Amin; Ali Khodaii
Abstract
Over the past four thousand years, the history of transportation began with pack animals and sailing boats and evolved with the invention of the wheel and steam engine. Air transport, with the ability to quickly cover long distances, has its own advantages and challenges. The volume of air freight transportation ...
Read More
Over the past four thousand years, the history of transportation began with pack animals and sailing boats and evolved with the invention of the wheel and steam engine. Air transport, with the ability to quickly cover long distances, has its own advantages and challenges. The volume of air freight transportation in Iran is relatively low compared to overall transportation, and there is a need to reduce costs and increase innovation. Air transport plays a crucial role in transporting valuable or time-sensitive goods in global trade. The status of air freight transportation in Iran has been examined in three main sections. First, the trend of transported volume, both domestically and internationally, has been recounted over the past decade, and consequently, information regarding the performance and market share of airlines in this sector has been discussed. Additionally, the role of airports (cities) in air freight transportation has been scrutinized, and data related to the volume of incoming and outgoing cargo from airports have been highlighted. Finally, a comparison between domestic and international air freight transportation has been conducted, providing an analysis of the performance of airlines in these two domains. To develop air freight transportation in Iran and enhance the efficiency of this industry, suggested solutions include attracting domestic and foreign investors, developing open skies agreements with other countries, leveraging Iran's unique geographical position to establish north-south and east-west corridors in the region, and reducing cargo transportation costs by outsourcing the airport transportation sector to airline companies.
مهندسی عمران-راه و ترابری
Mahdi Rahbar; Reza Amin; Ali Khodaii
Abstract
The main objective of this article is to examine the impact of the average age of intercity bus fleets on the number of passengers and road fatalities. To this end, data from the Road Maintenance and Transportation Organization of Iran and the Forensic Medicine Organization of Iran between the years ...
Read More
The main objective of this article is to examine the impact of the average age of intercity bus fleets on the number of passengers and road fatalities. To this end, data from the Road Maintenance and Transportation Organization of Iran and the Forensic Medicine Organization of Iran between the years 2018-2022 have been used. Transportation is one of the most important sectors in every country, and a considerable volume of transportation in our country takes place through roads. More than 80% of intercity travelers in the country are transported by intercity buses. Therefore, studying the factors affecting the quantity and quality of bus fleets is of particular importance.Unfortunately, in our country, due to various reasons such as sanctions, inflation, economic difficulties, lack of attracting investors, lack of attention by officials to planning and development, etc., the number of active buses has decreased and the average age of fleets has increased. In this research, data definition, study, and comparison have been used considering the subject of the research. The results show that with the increase in the average age of fleets, the average number of passengers has even decreased after the lifting of the COVID-19 restrictions and had a downward trend. Moreover, the risks and accidents of intercity travel and the increase in fatalities have increased with the aging of the fleets, and the shortage of bus tickets has become one of the problems, especially on special occasions. Proposed solutions to address this issue and reduce the average age of fleets, in the current conditions of the country, require more investment and attention, liberalization and assistance in importing new buses, and long-term support to domestic bus manufacturers to increase the quality and quantity of buses.
مهندسی عمران-راه و ترابری
Ahamad Jawad Ramaki; Reza Amin; Ali Khodaii
Abstract
Recognizing traffic signs is very important in the field of intelligent transportation systems, because it effectively increases the safety of our roads. By equipping drivers with vital information about potential hazards, this technology significantly reduces response time and helps making quick decisions ...
Read More
Recognizing traffic signs is very important in the field of intelligent transportation systems, because it effectively increases the safety of our roads. By equipping drivers with vital information about potential hazards, this technology significantly reduces response time and helps making quick decisions while operating the vehicle. Due to the exponential growth of our population, unfortunately the increase in the number of vehicles has led to a painful increase in traffic fatalities and injuries. Although the expansion of the transportation network helps the traffic issue, this expansion may be inapplicable due to the High financial costs, geographic and environmental limitations, as well as a long period of time to improve transportation infrastructure. Quality control of traffic colors, shabrangs, glass beads and other traffic signs in accordance with national and international standards will significantly reduce the number of dead and injured. Managing a smart city with emphasis on waste reduction and efficient use of resources is the main responsibility of traffic and transportation activities. The use of complex processing techniques in cars to increase safety without interfering with driving has been proposed as part of the concept of a smart city. This study looks at a new approach that can help create a framework for placing street signs using Google images into a traffic management program. The findings show a reduction in travel time, an increase in the use of the fleet, better maintenance of vehicles, and a reduction in carbon dioxide emissions from passenger cars.
مهندسی عمران-راه و ترابری
Hadi Shahsavari; Reza Amin; Ali Khodaii
Abstract
Providing road safety is an important social need. Ensuring road safety is one of the most rooted foundations in traffic engineering and transportation planning. Safety guards are one of the most common safety systems on the road. One of the most common road safety methods is using guardrails in the ...
Read More
Providing road safety is an important social need. Ensuring road safety is one of the most rooted foundations in traffic engineering and transportation planning. Safety guards are one of the most common safety systems on the road. One of the most common road safety methods is using guardrails in the middle of intercity routes. In recent years, intermediate concrete separators (New Jerseys) gradually replaced guardrails. In recent years, intermediate concrete separators (New Jerseys) gradually replaced guardrails. This research aims to investigate the safety performance of two types of guards (Dividers) guardrail and New Jersey on the freeway of Qazvin-Zanjan. The replacement of guardrails with concrete barriers (New Jersey) in the toll section of Tehran Qazvin to Ziaabad range has been ongoing for a length of 68 km since the end of 2018 and the end of 2020. The study found that New Jersey's installation reduced head-on crashes by more than 96 percent. It has also had a significant impact on reducing the number of accidents. However, the study of accident statistics will accurately explain the effectiveness of New Jersey in reducing accidents. However, the decrease in the frequency of accidents in axles with concrete protection may be due to the sense of security that drivers experience while driving on axles equipped with New Jersey. This issue was raised in several previous studies
مهندسی عمران-راه و ترابری
Fateme Farahani; Reza Amin; Ali Khodaii
Abstract
This article examines the pervasive issue of flight delays in Iranian airports and the factors affecting it. As air travel continues to play an important role in global connectivity and economic growth, understanding the causes and consequences of flight delays becomes critical. The importance of speed ...
Read More
This article examines the pervasive issue of flight delays in Iranian airports and the factors affecting it. As air travel continues to play an important role in global connectivity and economic growth, understanding the causes and consequences of flight delays becomes critical. The importance of speed as the main indicator in the aviation industry compared to other means of transportation caused the issue of flight delays to be looked at more sensitively. Also, one of the influential factors for the performance of airline companies and the level of passenger satisfaction is the issue of flight delays and cancellations by the company. Using a comprehensive data set and statistical analyses, we examine the percentage of delayed flights in Iran's main airports and clarify the underlying factors affecting these delays. Then, using the defined index, we compare the performance of the most important Iranian airlines in terms of flight delays and cancellations in recent years using available data. As a result of these calculations, all domestic airlines in Iran, like other countries in the world, experience the most delays in the winter season. According to the evidence, this issue is predictable to a good extent and more efforts should be made in this field so that there is less impact on the economy of the country and the comfort of passengers during the trip
مهندسی عمران-راه و ترابری
Hadis Ramezannezhad Koutenaei; Reza Amin; Ali Khodaii
Abstract
The transportation system stands as a pivotal factor in a nation's development. It is imperative to underscore that transportation activities form the bedrock of infrastructure, fostering economic growth within a country. Rail transportation, as an age-old method for conveying passengers and goods, remains ...
Read More
The transportation system stands as a pivotal factor in a nation's development. It is imperative to underscore that transportation activities form the bedrock of infrastructure, fostering economic growth within a country. Rail transportation, as an age-old method for conveying passengers and goods, remains widely embraced. Its popularity is rooted in various factors, encompassing the abatement of air pollution, contributions to sustainable development, cost-effectiveness, and heightened security measures, among others. This research endeavors to scrutinize the environmental influences contributing to the upsurge in passenger numbers within the rail transportation system. The study encompasses a thorough investigation of diverse factors influencing the increment in passenger numbers. Key variables integral to this research comprise the quantity of passenger cars in active service and storage, the consumption of various types of oil, the aggregate count of passenger cars, and the average journey distance. Upon analyzing the findings, it is evident that the variable denoting the number of passenger cars in service and reserve exerts a noteworthy impact on the escalation of passenger numbers over recent years. Consequently, a strategic focus on these variables during long-term planning and policymaking holds the potential to augment passenger figures in the rail transportation system.
مهندسی عمران-راه و ترابری
Golnaz Nasr Esfahani; Reza Amin; Ali Khodaii
Abstract
With the start of the corona virus from the city of Wuhan in China and its spread among other nations, a gray era began in the world. This crisis permeated all businesses and industries, including the airline industry. After the announcement of the World Health Organization (WHO) on March 21, 2020 regarding ...
Read More
With the start of the corona virus from the city of Wuhan in China and its spread among other nations, a gray era began in the world. This crisis permeated all businesses and industries, including the airline industry. After the announcement of the World Health Organization (WHO) on March 21, 2020 regarding the epidemic of this virus, physical distancing was recognized as the best way to deal with the spread of this disease. Hereupon, the demand for transportation decreased to a significant amount and the airline companies all over the world entered an economic recession. An analysis published by the International Air Transport Association (IATA) states that the crisis has reduced revenue generated from passengers for the world's airlines by 55% (equivalent to $314 billion) in the year of the outbreak. Similar surveys in other countries have also shown a decrease in travel demand and by examining various companies, researchers have recognized methods such as using technologies to reduce the need for physical contact in airports, the policy of removing the middle seat, etc., to be effective. They have also encouraged the governments to support the airline industries. In this article, the performance of Iranian airlines in domestic flights in the years 2016 to 2021 is examined and using the extracted results, a comparison between the years including covid-19 and other years is made. Due to the homogenization of the passenger, cargo and mail variables for comparison, indicators have been defined by dividing each variable by the number of flights. The result of this comparison shows a decrease of more than 20% in the passenger index from 2019 to 2020 and an increasing trend in cargo and mail indexes in these years, which can be due to people's eagerness for online shopping in this era compared to in-person shopping.
مهندسی عمران-راه و ترابری
Ali KhanMohammadi; Reza Amin; Ali Khodaii
Abstract
The Road Administration is one of the most important organizations in Iran, which is responsible for monitoring the safety and health of roads. One of the main issues that this organization faces is road accidents, which are one of the main causes of casualties and physical and financial damage in communities. ...
Read More
The Road Administration is one of the most important organizations in Iran, which is responsible for monitoring the safety and health of roads. One of the main issues that this organization faces is road accidents, which are one of the main causes of casualties and physical and financial damage in communities. In order to reduce accidents, the Road Administration has annual responsibilities. These functions, according to global standards, include increased monitoring of drivers, improved traffic systems, driving safety training and improved road infrastructure. This study first defined performance indicators and traffic safety and then analyzed its results. The analysis of the results of this study shows that despite the positive performance of the road organization and the decrease in the number of passengers, an upward trend is still observed in the number of accidents and fatalities in traffic accidents on suburban roads.
مهندسی عمران-راه و ترابری
Mehran Moradi; Reza Amin; Ali Khodaii
Abstract
The coronavirus outbreak has changed all over the world, and various industries have suffered severe damage. On the other hand, its impact on transportation as an important infrastructure has been significant. Reducing air pollution and traffic volume are also outputs of corona-related changes. This ...
Read More
The coronavirus outbreak has changed all over the world, and various industries have suffered severe damage. On the other hand, its impact on transportation as an important infrastructure has been significant. Reducing air pollution and traffic volume are also outputs of corona-related changes. This article examines the statistics and performance of Snapp and Uber companies. Using the Performance Report published by the companies, analysis and comparisons have been made between the two companies, as well as their various departments. In the end, the performance of Snapp and Uber companies has been compared to public transport. The results show that Corona has generally had a negative impact on transportation performance, especially public transport. Online taxi service provider companies، After the Corona era, they have been able to compensate for their losses and surpass the pre-Corona conditions, but public transport continues to face problems caused by Corona. In some parts of transportation, the effects of corona have been positive. This is due to quarantine and social distancing. Carrying methods that reduce passenger movement, such as couriers and cargoes, were welcomed. Corona has also made a visible impact on people's lifestyles. The results show that after the coronavirus epidemic, users have not returned to their past methods of transportation.
مهندسی عمران-راه و ترابری
Milad Honarjoo; Reza Amin; Ali Khodaii
Abstract
Transportation in the field of postal delivery is of great importance, and various types of vehicles and methods are used to send postal items to different destinations. Among these, air transportation is one of the fastest and most efficient methods for sending postal items globally. Airplanes, with ...
Read More
Transportation in the field of postal delivery is of great importance, and various types of vehicles and methods are used to send postal items to different destinations. Among these, air transportation is one of the fastest and most efficient methods for sending postal items globally. Airplanes, with their high speed and access to remote locations, make it possible to send postal items to distant destinations. In this study, the performance of the country's airline organization in the transportation of postal items on domestic flights, flights from within the country to abroad, and flights from abroad to the country over a decade has been examined and analyzed. This analysis was conducted using data extracted from the statistical yearbooks of the national airline organization, which allowed for the creation of charts and trendlines based on them. The results of this analysis show that the transportation of postal items on domestic flights in Iran has had a decreasing trend over the past decade. On the other hand, the transportation of postal items on flights from abroad to Iran has shown an increasing trend. Additionally, the transportation of postal items on flights from within Iran to abroad has had a relatively constant trend. Finally, the discussion will conclude with an assessment of the issues and a summary of the findings from this decade-long performance.
Civil Engineering
Parsa Hassanzadeh; Reza Amin; Ali Khodaii
Abstract
Urban trains, as one of the most important public vehicles in cities, are related to traffic and environmental issues. To improve the efficiency of these systems, it is necessary to examine and prioritize the factors affecting their efficiency. This article tries to identify and prioritize the important ...
Read More
Urban trains, as one of the most important public vehicles in cities, are related to traffic and environmental issues. To improve the efficiency of these systems, it is necessary to examine and prioritize the factors affecting their efficiency. This article tries to identify and prioritize the important factors affecting the efficiency of urban trains. In this article, the factors affecting the efficiency of urban trains are first examined, which include important aspects such as time interval, time wastage, safety, energy consumption, number of trains, management and planning, and passenger satisfaction; Then, by using case studies and data analysis collected from Tehran, the factors that have the greatest impact on efficiency are prioritized. The results show that in different conditions, different factors can have priority. In the end, recommendations for improving the efficiency of urban trains are presented, which can be effective as practical solutions for urban officials, public transport managers, and policymakers to improve the performance of urban train systems.
مهندسی عمران-راه و ترابری
mohammad zamani; Reza Amin; Ali Khodaii
Abstract
The results of capital stock and labor force coefficients showed that there is a constant return to scale in the road transport fleet sector. Also, in this sector, new investment and renovation has increased with technical progress in such a way that it has reduced the average age of the fleet and has ...
Read More
The results of capital stock and labor force coefficients showed that there is a constant return to scale in the road transport fleet sector. Also, in this sector, new investment and renovation has increased with technical progress in such a way that it has reduced the average age of the fleet and has led to an increase in the growth rate of qualitative capital and productivity. So; The direct relationship between fleet renewal and productivity in Iran's road transport sector is confirmed. Therefore, it is suggested to use equipment with superior technology and replace the road fleet with new and advanced equipment Therefore, all parts of the road transport industry require their own special attention, which is addressed to each of the topics in the discussions related to road safety management; And its special rules, regulations and standards should be taken into consideration. The road transport fleet is considered as one of the most strategic transport systems of any country. High level and technological complexity, quality and strict prerequisite standards have made this system known as one of the most effective transportation systems in the world.
مهندسی عمران-راه و ترابری
Amirmohammad Esmaeilzadeh Azar; Reza Amin; Ali Khodaii
Abstract
Over the past 10 years, the performance of airlines in the passenger domain has been influenced by various factors. Consequently, numerous studies have been conducted worldwide on the factors affecting the performance of airlines in passenger services, and Iran has also seen significant statistical studies ...
Read More
Over the past 10 years, the performance of airlines in the passenger domain has been influenced by various factors. Consequently, numerous studies have been conducted worldwide on the factors affecting the performance of airlines in passenger services, and Iran has also seen significant statistical studies in this regard. In this research, an attempt has been made to conduct a comparative analysis of the years 2012 to 2022 for Iranian airlines in the passenger domain, using defined statistical indices. The defined indices in this study include passenger density on each flight, the percentage of delayed flights, the percentage of canceled flights, and the number of flights passing through the country's airspace. It was observed that Iran had acceptable performance in three indices until the onset of the COVID-19 pandemic. However, after the pandemic, due to lack of planning and readiness for unforeseen events like COVID-19, the airline performance has been severely impacted. Hence, airlines need effective planning and strategies to prevent the adverse effects of unforeseen events such as the COVID-19 pandemic. Overall, the developments of this decade highlight the need for flexibility and the ability to respond to challenges in the aviation and air transportation industry
مهندسی عمران-راه و ترابری
Saeid Ghasemi; Reza Amin; Ali Khodaii
Abstract
This article examines the effect of human error in aviation accidents. Aviation accidents are one of the most important factors that threaten security in air transportation, and various factors can play a role in their occurrence. One of these factors is human error, which can lead to an accident from ...
Read More
This article examines the effect of human error in aviation accidents. Aviation accidents are one of the most important factors that threaten security in air transportation, and various factors can play a role in their occurrence. One of these factors is human error, which can lead to an accident from simple to serious and uncorrectable errors, also human error is one of the important factors in plane accidents that can have serious consequences for the health and safety of passengers and aircraft employees. It may occur at any stage of the flight process from design and manufacturing to flight operations and maintenance. In the flight operations phase, this error can include pilot and air traffic control errors, ground logistics errors (such as lack of proper maintenance and repair of aircraft), and flight crew performance errors. It is clear that the detailed investigation of human errors in aviation accidents plays a significant role in increasing the safety of flights and may lead to effective improvements in the fields of pilot training and aircraft systems design. The purpose of this article is to analyze the human error in aviation accidents and the factors affecting its occurrence, which can help improve the safety and performance of airplanes and thus save people's lives in aviation accidents.
