Iljoon Chang

• Gachon University

Automated vehicles minimize driver errors and can help reduce traffic accidents. If the automated driving system encounters an unexpected problem, control is transferred to the driver and driving safety is significantly impacted. 63.3% of disengagements caused by road structures are due to recognition errors on curves. However, the criteria for cur...

The safety of electric scooters (e-scooters) are issued frequently. Because of the structure of the e-scooter, it is highly affected by the road environment owing to its small wheels; therefore, most e-scooters fall down alone. Therefore, we aim to identify the factors that affect driving characteristics of e-scooter according to the road type. Add...

Understanding locally heterogeneous physical contexts in built environment is of great importance in developing preemptive countermeasures to mitigate pedestrian fatality risks. In this study, we aim to investigate the non-linear relationship between physical factors and pedestrian fatality at a location-specific level using a machine learning appr...

CO2 emissions from fossil fuel combustion and industrialization contribute nearly 78% to the total greenhouse gas emissions. To reduce CO2 emissions in the transportation sector, the South Korean government is attempting to introduce a battery-swapping electric bus system. Some government-level economic analysis studies have been conducted to analy...

The Autonomous Emergency Braking (AEB) systems have been actively studied for the safety enhancement and commercialized for the past few years. Because the driver tends to overly rely upon active safety systems, AEB needs to be designed to reflect the real road situations such as various road slope and friction coefficient. In this study, an AEB co...

The development of vertical/horizontal moving-assistant systems is at an initial stage. However, it is expected to enhance the efficiency of mobility-disabled individuals when it is used in the field of public transportation systems. Hence, this study involved analyzing the benefits and whether users would be willing to pay more as a type of tax to...

Delay and congestion has always been the problem in the signalized intersection. Studies proved that converting signalized intersection to modern roundabout had been done in several countries and have better improvement in performance. This study analyzes the effect of converting signalized intersection to modern roundabout in Pelem Gurih Intersect...

Modern roundabout installation is expanding nationwide in Korea recently. However, modern roundabouts are not installed extensively because of lack of effects analysis and the broad criteria for selection of the intersection. This study analyzes delay reduction effects based on the entry traffic volume in order to refine the selection criteria of t...

In order to analyze the trip generation behavior of metropolitan commuters, a two-stage structure is proposed in which an activity demand generation model is constructed and the generated activity demand is connected with the other trips. As for the activity generation model, the frequency of activities generated was constructed into an ordered log...

At present, Seoul City is putting the bus exclusive lane system into practice according to mass transit revitalization policy. Starting with the installation of roadside bus exclusive lane in the past, at present, even the road sections for central- lane bus exclusive lane system are on the increase. The purpose of this research is to analyze the f...

Many approaches have been performed to reduce traffic accidents at signalized urban intersections in Korea. Among them installing red-light running cameras have been the most popular and simplest approach. Recently, on the other hand, engineering approaches have been tried and as a result, some provinces in Korea have started to install “near-site”...

In traditional identification of hot spots, often known as the sites with black spots or accident-prone locations, methodologies are developed based on the total number of accidents. These criteria provide no consideration of whether the accidents were caused or could be averted by road improvements. These traditional methods result in misidentific...

Traffic demand is continuously increasing due to the development of urban areas in Korea. To cope with this, many efforts have been done including constructions of new roadways and increasing the number of lanes of the existing roadways. Those efforts, however, have been performed for only a short segment of target links having similar traffic char...

The unsignalized intersections in a community road in the city of Seoul have 3,753 traffic accidents(9%) of total 41,702 cases in 2008, not high in the occurrence rate of traffic accidents, but seem to have a quite high potential of accidents due to the unreasonable and insufficient operation of systems and facilities in the part of traffic foundat...

This paper presents a novel application of static traffic assignment methods, but with a variable time value, for estimating the market share of high‐speed rail (HSR) in the northwest–southeast (NW–SE) corridor of Korea currently served by air, conventional rail and highway modes. The proposed model employs a time–space network structure to capture...

Thesis research directed by Dept. of Civil and Environmental Engineering. Thesis (Ph. D.)--University of Maryland, College Park, 2001. Includes bibliographical references (leaves 194-201).