Seungjae Lee

University of Seoul · Department of Transportation Engineering

In this study, we aim to clarify the differences in the factors influencing subway traffic behaviour of senior and non-senior passengers during the COVID-19 pandemic based on big data in Seoul, South Korea. A one-way analysis of variance is performed to analyse the influencing factors of subway use of senior and non-senior passengers during the COV...

To achieve endemic phases, repeated vaccinations are necessary. However, individuals may grapple with whether to get vaccinated due to potential side effects. When an individual is already immune due to previous infections or vaccinations, the perceived risk from vaccination is often less than the risk of infection. Yet, repeated rounds of vaccinat...

The popularity of cycling has increased because it is conceived to be a much safer and environmentally friendly travel mode than automobiles and mass transit. As a result, shared-bike programs have gained attention among academics and policymakers. While inefficacies and other deficits in shared-bike programs have been described in the literature,...

In many cities worldwide, various urban problems such as traffic congestion and environmental pollution are becoming increasingly serious due to traffic. As global warming intensifies due to various causes, the Science Based Targets initiative has proposed a “Net-Zero” standard for net-zero greenhouse gas emissions. Many cities are adopting more su...

The spread of COVID-19 has resulted in several changes worldwide. In particular, border closures and economic stagnation have significantly affected societies. Although the implementation of preventive measures has improved the pandemic scenario in several countries, the effectiveness of vaccines has decreased with the emergence of mutant viruses....

Coronavirus disease (COVID-19) has significantly affected daily lives since its declaration as a Pandemic in March 2020 by the WHO. Studies in Korea to interpret the relationship between COVID-19 and transportation show that there has been a decrease in public transportation use, and a significant decrease when a widespread infection occurs. In add...

Recently, as the types of leisure activities have diversified and the leisure traffic has increased, individual travel patterns have become more complex. It is impossible to precisely track non-daily travel with the existing survey method. Therefore, this study attempted to estimate leisure travel behavior by collecting social media platform inform...

In the study of pedestrian dynamics, the consideration of group behaviours is essential, as group interaction within crowds is a common phenomenon and significantly influences pedestrian behaviours. This special issue highlights the importance of pedestrian group behaviours and examines the subject using a wide range of methods, such as experiments...

Carbon neutrality is essential to limit global warming. The promotion of hydrogen cars in the transportation sector may be consistent with this policy. Hydrogen cars, because of their shorter charging time and longer operating distance per charge than electric vehicles, are suitable replacement for vehicles that emit air pollutants, such as large t...

In recent years, the number of people embarking on leisure-travel trips has increased rapidly. Consequently, travel patterns have changed depending on the type of leisure trip. However, accurately establishing non-daily travel data using conventional travel diary surveys with the existing self-survey method is impossible. A possible solution is the...

The Net-Zero standard was proposed by Science Based Target (SBTi) to bring the net greenhouse gas emissions to zero as global warming intensifies, and this policy is spreading worldwide. Public transportation plays an important role in eco-friendly transportation and establishing a railway-oriented public transportation system is important. Among m...

The Republic of Korea was ranked 11th globally, in 2018, in terms of greenhouse gas emissions, of which the transportation sector contribution was estimated to be 14 % in 2017. Many policies have been drawn to enhance transport sustainability and reduce its emissions. According to the Climate Action Tracker (CAT), the policies and actions of South...

Recent studies have applied the percolation theory to analyze the connectivity of networks in the transportation field. However, research was conducted in a manner that completely removed the function of nodes or links. There was a limit in that applying public transportation was difficult to guarantee the right to move the captive rider. In this s...

Personal Mobility (PM) has attracted considerable attentions as an eco-friendly mode of transportation. In Seoul, the PM penetration rate has grown by 30% annually, and the number of PM companies has been increasing. However, there is a high risk of collision against a pedestrian while riding PM vehicles on sidewalks. To create a safer operation en...

In a situation that repeated vaccinations are required as the epidemic spreads, individuals are concerned about whether they are vaccinated or not. If an individual has immunity from an infection or vaccine, they recognise that the very small risk associated with vaccination is relatively greater than the risk of infection. When repeated vaccinatio...

Many countries, including Korea, are striving towards carbon-neutrality by 2050. Accordingly, this study proposes a method for cutting carbon emissions by reducing the use of passenger cars through a travel demand management scheme called mobility hub. The effectiveness of this approach has been estimated by designing a mobility hub for Seoul using...

Recently, the necessity to redefine the mode selection model (modal split model) has emerged owing to the diversification of transportation systems. In addition to socio-economic factors, preference factors and user characteristics significantly affect the selection of transportation mode. Therefore, user preferences are reflected in the modal spli...

This study aims to analyze the changes in urban railway network centrality by introducing metropolitan express railways and analyzing the environmental benefits owing to the activation of public transportation. Interest in climate crises is emerging and interest in the environment and carbon emissions is increasing. Countries around the world, incl...

The focus of policymaking in Korea has changed from vehicle-centric road environments to people-centric environments. As the importance of walking has increased, the construction of pedestrian paths and interest in pedestrian environments have also increased. However, problem recognition and resolution require considerable time in the event of a pr...

Currently, the evaluation of pedestrian paths is very time consuming. Additionally, disabled pedestrians do not tend to change their routes, even if pedestrian conditions are poor, resulting in reduced convenience and safety. Therefore, it is important to identify and act on the statuses of pedestrian paths quickly. Therefore, this study aimed to i...

This study aims to analyze the transition in transportation caused by COVID-19. The study focuses on a shared bicycle ‘Ttareungyi’ in Seoul and its spatial characteristics. Data on shared bicycles in Seoul from 2019 to 2020 are used to analyze the change in use of shared bicycles. We collect the number of daily rentals by each rental station, and t...

Recently, interest in the first/last mile has increased with the development of personal mobility vehicles (PMVs), a new eco-friendly and easy-to-use transportation mode. As shared transportation has become more active, existing pedestrians have begun using shared PMVs (e.g., e-scooters and bicycles). The main purpose of this work is to compare and...

Transportation demand management has been implemented in Seoul to realize the transit-oriented development for its evolution into an eco-friendly city. The policies include reorganizing road space, restricting the operation of fifth-grade vehicles, increasing parking fees, and expanding shared bicycles. The Seoul Metropolitan Government monitors tr...

The Seoul Metropolitan Government is promoting and implementing eco-friendly transportation policies covering the revitalization of public transportation, establishment of green transportation promotion areas, and the expansion of shared-bicycle use. With the prevalence of the COVID-19 pandemic, cities worldwide have been paralyzed by lockdowns, th...

Recently, the interest and operation of personal mobility (PM) have been actively conducted in Seoul. The PM penetration rate in Seoul is increasing by more than 30 % every year, and the number of PM-shared lenders is increasing every year. PM enables faster and greener movement in complex downtown Seoul. The survey showed that PM is 1.8 times fast...

Korea had a big ambition to be one of the most sustainable cities, so the government is paying more attention to environmental impacts as a key element in evaluating any transportation project, such as subway construction and extension. Compared to other transportation modes, the railway system provides significant environmental, economic, and soci...

In recent years, with the emergence of personal mobility (PM) and the importance of eco-friendly modes, the role of pedestrian has increased. However, studies on pedestrian, especially methods for determining pedestrian volume, are very limited. Therefore, in this research, we study algorithms for detecting pedestrians based on mobile data and GPS...

Several intensive policies, such as mandatorily wearing masks and practicing social distancing, have been implemented in South Korea to prevent the spread of the novel coronavirus disease (COVID-19). We analyzed and measured the impact of the aforementioned policies by calculating the degree of infection exposure in public transport. Specifically,...

The COVID-19 outbreak in 2020 has changed the way people travel due to its highly contagious nature. In this study, changes in the travel behavior of passengers due to COVID-19 in the first half of 2020 were examined. To determine whether COVID-19 has affected the use of transportation by passengers, paired t-tests were conducted between the passen...

The automobile industry is showing increasing interest in eco-friendly electric vehicles (EVs) with the aim of replacing vehicles that rely on traditional fossil fuels for energy. This study investigates the routing of an EV with maximum efficiency relative to the terrain. As EVs have poor climbing ability due to limitations associated with battery...

At present, the automobile industry's interest in eco-friendly electric vehicles is increasing and those vehicles are replacing vehicles using traditional fossil fuels. This study considers how to drive an electric vehicle with maximum efficiency depending on the terrain. Since electric vehicles have poor climbing ability, they have a limitation in...

Recently, Seoul has been pushing for eco-friendly transportation policies to reduce emission and improve environment, including restrictions on the use of cars and the introduction of shared bicycles. The government introduced the shared bicycles, of which the demand has been steadily increasing. The government is planning to introduce Cycling Rapi...

Smart card technology has revealed its potential as a reliable and rich data source for transportation analysis and planning over the past years. This study exploits smart card data to analyse the skip-and-stop planning of line number 9, from Gaehwa and Nonhyeon in Seoul, South Korea, and to propose a new optimised schedule. The research uses two m...

The study aims to predict the location of taxi users, based on an algorithm that was built using a map learning method, which is one of the techniques of deep learning. As the location data of taxi riders showed sequential characteristics over time, learning was performed using a recurrent neural network, which is suitable for predicting dynamic ch...

Cities areconstituted of several objects related within an urban form, which is a conceptthat is used to describe the physical and non-physical characteristics of acity. Cities provide different services to fulfill citizens’ needs, in whichtransport demand. The urban form is strongly related to transport design,particularly to public transport desi...

The Seoul Metropolitan Government has implemented a public transportation priority policy with the introduction of a 121.1 km long of the Median Bus Lane (MBL). Therefore, to analyze the impacts of the introduction of Jongro-gu MBL in January 2018, an effect analysis using the speed and volume of passenger cars and buses in Seoul is conducted in th...

Introduction We aimed to determine whether maximal exercise capacity, left ventricular function, and quality of life (QoL) scores are sustained in patients with atrial fibrillation (AF) after termination of training following exercise-based cardiac rehabilitation (ECR). Methods In a prospective study, 58 patients with AF (age, 62 ± 7 years) were r...

Introduction Exercise training (ET) improves endothelial function and arterial stiffness in patients with cardiovascular disease. However, whether ET improves endothelial function and arterial stiffness in patients with atrial fibrillation (AF) is unclear. If it does, for how long the effects are sustained remains to be determined. Methods In a pr...

Low Emission Zone policy (LEZ) is considered one of the most reliable and efficient Travel Demand Management (TDM) measures. LEZ concept first appeared in Europe in the form of Access Restriction (AR) measure (e.g. Rome ZTL). This article discusses the European LEZ scheme’s advantages and flaws. The goal is, first analysing the policy’s perception,...

Rapid evaluation processes are required especially for government funded eco-friendly projects, which aim to create eco-friendly transport facilities for cyclists and pedestrians. These projects should be constructed massively and timely to increase the use of bicycle and pedestrian facilities. Because the global warming issues are increasingly thr...

There are three fundamental issues about a transport system or geographic space in general: How it looks, how it works, and what it ought to be. In terms of how it looks and works, there are two laws governing geographic forms and processes or urban structure and dynamics in particular: scaling law and Tobler’s law. Scaling law is available across...

Parking policies become one of the prominent measures of ‘Travel Demand Management’ strategy, as they immensely influence private car usage, and as they represent a crucial link between transportation and land use disciplines. The parking policies have noticeable impacts on mode choice, travel route, and many other urban mobility characteristics, e...

Call for papers of the themed issue.

The ‘Congestion Pricing’ policy is one of the best and reliable ‘Travel Demand Management’ measures. The scheme is widely popular, and it was implemented in many cities around the world. This article discusses the congestion pricing scheme while considering European cities as case study to analyze the policy’s effects and instruments. For the study...

In disaster situations, the evacuation of pedestrians is very important. In particular, handicapped pedestrians experience difficulties in evacuation situations because they cannot move quickly. Therefore, the evacuation of handicapped pedestrians is considered to be an important factor in disaster situations. In this study, we use a walking model...

Recent advances in CV environment made technologies much higher level. We just thought about that high-level technologies made CV environment better. This paper studies the CV environment considering various traffic congestion level and optimal speed control using the microscopic simulation (Vissim) based on proper parameters and algorithm. To eval...

Research on connected vehicle environment has been growing rapidly to investigate the effects of real-time exchange of kinetic information between vehicles and road condition information from the infrastructure through radio communication technologies. A fully connected vehicle environment can substantially reduce the latency in response caused by...

Research on connected vehicle environment has been growing rapidly to investigate the effects of real-time exchange of kinetic information between vehicles and road condition information from the infrastructure through radio communication technologies. A fully connected vehicle environment can substantially reduce the latency in response caused by...

In a destination choice model, it is important to introduce alternatives that have been adequately aggregated into traffic analysis zone levels based on spatial similarities and feasibility of analysis, because considering every spatial location possible for the traveler as an elemental alternative is intractable in terms of data management and ana...

Public-Private-Partnerships tend to be committed high project development cost and recover the cost through future revenue during the operation period. In general, long-term concession can bring on more revenue to private investors, but short-term concession less revenue due to the short recovering opportunities. The concession period is usually de...

Due to global warming, the reducing air pollution is an important policy issue in the metropolitan area. Since the road mobile pollutant is the probable reason for the air quality pollution, the electric vehicle expansion is one of the main strategies for sustainable transportation systems. The expanded distribution of electric taxis depends on the...

As the economies grow, a number of high-rise buildings and large complex shopping canters have been built in Korea. However, these buildings are huge and complex in their size and structure. Therefore, agents will face evacuation problems under the fire situation. Unless agents evacuate rapidly, they will suffer from the suffocation and poisoning t...

As the guest editors of this issue, we are glad to see variety of papers that focus on major topics in Complex Disasters and Disaster Risk Management. The main focus therefore is to identify, understand and respond complex disasters and recover the built environment. Furthermore, the journal is getting more international each year, which is an indi...

Minimising the damage caused by natural disasters such as tsunamis in vulnerable coastal areas requires the development of an emergency action plan. An evacuation plan can reduce the damaging impact of an unexpected tsunami. One of the most important factors in developing an action plan is a guideline for choosing proper evacuation routes in order...

For the development of agent based traffic simulation model, population synthesis is critical to the accuracy of simulation outcomes. This paper attempts to develop the synthetic population generation based on the Simulated Annealing (SA) algorithm for the activity-based travel demand model. This algorithm leads to estimate the activity schedules a...