TRUE LAB @ ​KAIST [BLOG]

Transportation Research and Urban Engineering Laboratory
Department of Civil and Environment Engineering, KAIST

TRUE’s research objective is to offer solutions to problems in complexly connected transportation and social infrastructure systems by data-driven analysis including statistical methods and simulation techniques. The solutions encompassing economical and operational engineering aspects aim to build a foundation for a sustainable and intelligent urban environment in future.

POST AI & Mobility

2021 ~ present

​모빌리티 분야에서의 인공지능은 교통안전 증진 및 교통흐름 최적화 등 다양한 목적으로 활용이 가능합니다. 하지만, 인공지능 기반 모빌리티는 데이터 오너쉽의 모호함, 개개인의 모빌리티 사용 패턴의 불균형, 사회 비용 추산의 투명성 미확보, 특정 기업의 기술 및 데이터 내재화 가속 등 기존 모빌리티 시스템에서 경험하지 못한 다양한 문제가 발생할 것으로 예상됩니다.

​TRUE 연구실에서는 인공지능 기반 모빌리티 기술의 영향을 사회 및 개인 관점에서 탐색하고 이를 해결하기 위한 연구방향을 제시하고자 합니다. 특히, 기존 모빌리티 분야의 접근성(accessibility)의 개념을 단순한 근접성 (physical accessibility)을 넘어서, 인공지능 기반 미래 모빌리티의 기술 혜택의 접근성 (technology accessibility), 정보 및 지능 접근성(intelligence accessibility), 안전 및 보안 접근성 (security accessibility) 로 확장하여 더 다각적이고 심화된 고려 및 대응을 준비하고자 합니다.

​모빌리티 비롯한 다양한 분야에서 신뢰가능한 인공지능 개발 및 사용을 위해, 전 세계적으로 인공지능 법안, 육성 계획, AI 백서 등을 발간하고 있습니다. 본 웹페이지에서 유럽연합의 인공지능 법안 및 육성 계획을 소개합니다.

EU 인공지능 법안 (Artificial Intelligence Act)

​유럽연합 집행위원회는 사람들의 건강을 위험하게 하거나 기본권을 해칠 수 있는 고위험 인공지능(AI)의 사용을 규제하는 내용의 인공지능 규제 법안을 2021년 4월에 발표하였습니다. 이 법안에 따르면, 고위험 인공지능시스템은 위험성 평가를 거치는 등 출시 전 엄격한 요구 사항을 충족해야 합니다. 교통 관리 및 운영, 생체 인식, 신용 평가 등에 사용되는 인공지능시스템이 이에 포함됩니다.

다음 웹페이지 [link] 에 해당 법안에 대한 내용이 자세히 설명되어 있습니다.

EU 인공지능 육성 계획 (Coordinated Plan on Artificial Intelligence)

유럽연합 집행위원회는 2021년 4월 발표한 인공지능 육성 계획에서 더 안전하고, 지속가능한 AI 기반 모빌리티를 핵심 정책목표 중 하나로 제시하였습니다. AI 기반 모빌리티는 더 안전하고, 더 공평하며, 더 효율적인, 지속가능한 승객 및 화물 운송 서비스 촉진에 목적을 두고 있습니다.

다음 웹페이지 [link] 에 해당 계획안에 대한 내용이 자세히 설명되어 있습니다.

AI와 교통약자 (AI for Vulnerable User)

인공지능 기반 모빌리티 기술이 실생활에 접목됨에 따라 이동이 필요한 모든 사용자들의 모빌리티 경험은 적지않은 변화를 맞이하게 될 것입니다. 기존 교통약자로 분류되는 사용자들에게 AI 모빌리티 기술은 더 나은 생활을 제공할 수 있을까요?

AI 모빌리티 시대의 기술적 접근성(technology accessibility) 관점에서, 새로운 모빌리티 시스템의 활성화로 발생할 수 있는 교통약자들의 위험과 소외현상을 고령자와 어린이, 장애인, 시골 지역(rural area)으로 나누어 살펴보았습니다.

해당 교통약자에 대한 내용은 다음 웹페이지 [link] 에 자세히 설명되어 있습니다.

​​Urban Air Mobility

UAM Concept of Operations

​도심항공 모빌리티 UAM (Urban Air Mobility)는 기존 육상 교통수단의 한계를 극복하고 3차원 도심 상공에서 사람이나 화물을 운송할 수 있는 수직이착륙 교통수단 및 이를 지원하기 위한 이·착륙 인프라 등을 포함하는 항공교통 체계를 의미합니다. UAM은 급성장이 예상되는 미래 모빌리티의 신 첨단산업으로서 향후 20년간 700조원 이상의 규모로 성장할 것으로 예상됩니다. 이에 주요 모빌리티 기업과 각국 정부가 앞다퉈 기술개발 대열에 합류하고 있습니다.

​이러한 상황에서 2020년 상반기 미국 연방항공청 FAA와 미국 항공우주국 NASA는 UAM의 운용 개념을 구체적으로 제안하는 UAM ConOps과 UAM OpsCon Passenger-Carrying Operations를 각각 발표하였습니다. 세계적인 추세에 발맞춰 우리나라 또한 국내에 맞는 실질적 운용 개념을 포함한 ’한국형 도심항공교통 (K-UAM) 로드맵‘과 기술개발 로드맵을 2020년 상반기에, 그리고 최근 6월 UAM 운용 개념서를 발표하였습니다. 자세한 설명은 다음 웹페이지 [link] 에 설명되어 있습니다.

Data-driven future demand forecasting for UAM

​As the public interest of UAM* is getting higher and the underlying technology for UAM becomes sophisticated, the need to forecast the future demand of UAM increases. As the data-driven demand forecasting method has become more accurate than the traditional modeling-based forecasting method, TRUE lab utilized Seoul taxi GPS data to forecast the potential demand for UAM. Our assumption is based on the idea that part of the long-range taxi trip will be replaced by the emerging mobility service - UAM. As our first step toward UAM demand forecasting, we considered the case of using existing helipads. We plan to expand our scope in future work to UAM routing, fleet rebalancing and scheduling. For details, please visit our blog.

#deep learning #graph convolutional networks #short-term traffic forecasting #transportation network

​Short-Term Traffic Forecasting Using Graph Convolutional Networks [link]

​​Traffic forecasting problem is a research area in transportation engineering that has flourished over the last couple of decades, and started to garner broader research interest as a key technical enabler of the adaptive traffic management. The recent surge of Graph Convolutional Networks has led to acute improvement on the performance of traffic forecasting tasks. However, many studies overlook the features that can represent the transportation networks such as speed limit, distance, and flow direction. In our research, we propose Multi-Weight Traffic Graph Convolutional Networks (MW-TGC) to incorporate aforementioned features in a single model and to reflect more spatial dynamicity in traffic forecasting problem. Experiment on two real-world datasets show that the proposed model outperforms the state-of-the-art models.

SELECTED REFERENCES

  • Y. Shin and Y. Yoon, "Incorporating Dynamicity of Transportation Network With Multi-Weight Traffic Graph Convolutional Network for Traffic Forecasting," in IEEE Transactions on Intelligent Transportation Systems, doi: 10.1109/TITS.2020.3031331.
  • ​​UTM(UAS Traffic Management) and Spatial Analysis

    2017 ~ present

    #path planning #UAS traffic congestion #operation volume

    Density-aware flight planning for multiple agents in urban airspace

    ​The aim of this on-going study is to present a flight planning framework that can be applied in a large-scale map environment, such as city-wide airspace. Two key components of this framework are hierarchical spatial data representation and multi-agent pathfinding algorithm. Choosing an appropriate spatial data structure is crucial for monitoring and planning high-density urban operations in a large-scale map, and we propose octree- and medial axis- based approaches to represent urban airspace. Based on proposed spatial data structures, we adopt and apply a variant of conflict-based search (CBS), proposed by Sharon et al (2015), to assign each agent to a sequence of airspace volumes while taking into account projected traffic density within each volume. Detailed methods and analysis results will be made available in our working paper.

    #UAV #Satisficing theory #Cooperative collision avoidance

    ​Cooperative sUAV Collision Avoidance

    ​The aim of this study is to present a cooperative collision avoidance approach for sUAV in the low-altitude uncontrolled airspace based on satisficing game theory. By incorporating both the self and cooperative preferences in making individual heading decision, satisficing framework provides a collision avoidance strategy that increases throughput while decreasing unnecessary collisions. Simulation-based sensitivity analysis is conducted with varying satisficing parameters, including number of sUAV agents, minimum separation, action angle, and dual utility parameters of raw preference and negotiation index.

    SELECTED REFERENCES

  • Namwoo Kim, Yoonjin Yoon, "Cooperative sUAV Collision Avoidance Based on Satisficing Theory", International Journal of Aeronautical and Space Sciences, 2019
  • ​#UAV #Risk #Regionalization #Spatial analysis

    Geodemographical Risk Analysis of 3D Urban Space

    ​​​For application of UAS and UAM in urban area, people and man-mad structures that consisting urban environment should be considered. We analyzed urban space by using census tract based population data and 3d building model data. Highly urbanized areas – Manhattan Island and San Francisco were analyzed for their urban space characteristics.

    ​#UAS #airspace availability #geofence

    Urban Airspace Availability Assessment

    One of the key challenges in enabling large-scale UAS operations at low altitude lies in the limited airspace of densely built-up urban environment. Unlike the high-altitude controlled airspace, the geospatial complexity arising from existing static obstacles such as buildings and terrain poses a new challenge in the UAS traffic flow management. Hence, a more adaptive and intelligent approach is necessary to identify airspace that is not only free of obstacles but also usable or operable within an acceptable level of risk.

    As a first step to airspace capacity management, we propose an airspace availability assessment framework that incorporates the underlying geospatial complexity as well as vehicle operational requirements. Specifically, we utilize two types of geofence - keep-out and keep-in.

    This interactive tool enables you to explore the airspace availability in three case study areas - Gangnam, Manhattan, and San Francisco. Using this tool, one can identify and compare usable airspace at given altitude with various geofence parameter combinations.

    SELECTED REFERENCES

  • Jungwoo Cho, Yoonjin Yoon, "How to Assess the Capacity of Urban Airspace: A Topological Approach Using Keep-in and Keep-out Geofence", 92, 137-149, Transportation Research, Part C, 2018
  • Method for identifying available airspace for unmanned aerial vehicle operations, Patent filed, Dec 17, 2017, KR 10-2018-0033978
  • #airspace skeletonization #reeb graph #airspace topography

    Horizontal and Vertical Connectivity of Airspace

    Low-level airspace contains existing environment of people and surrounding structures that are sensitive to risks posed by UAS operations. In such environment, not all free airspace is available for operational use. In many literatures, however, UTM airspace is often regarded nearly free of obstacles, and geospatial complexity of airspace arising from obstacles is not fully addressed.

    In this study, we present topography map and skeletal graph to interpret underlying geometrical and topological properties of urban airspace. Specifically, we present topographic map to provide a quantitative representation of vertical and horizontal dimension of usable airspace. Also, a skeletal graph is extracted to uncover horizontal and vertical connectivity of airspace. Both methods not only provide a compact and informative abstraction of airspace but also can be used to partition the entire airspace into different levels.

    SELECTED REFERENCES

  • Jungwoo Cho, Yoonjin Yoon. "Extraction and Interpretation of Geometrical and Topological Properties of Urban Airspace for UAS Operations". 13th ATM R&D Seminar, 2019
  • ​#UTM #Routing

    UTM: Urban Drone Routing

    ​- UAV path extraction & visualization in the case study area of Manhattan, NY

    ​- keep-out geofence of 30 meter is applied to mid-town area​

    Transportation Network & Data Representation

    2017 ~ present

    #road network #traffic data #spatial network

    Traffic Data Representation: ​Resolutions and Structures

    #air transport network #network robustness #complex network #weighted network

    Air Route Network as Complex Network

    ​​​​Air traffic carried by three major countries in Northeast Asia have significantly increased in the past decade. In contrast to the growing importance, there exist few regional studies on the characteristics of the Air Transport Network (ATN). ATNs have been researched over a couple of recent decades by modeling them as airport networks. Airport networks as virtual networks of directly connected airport pairs essentially model airline service network to exclude the airspace, where most of the operational resources are consumed. In this study, air route network robustness of the rapidly growing Northeast Asian region is assessed based on the node criticality.

    SELECTED REFERENCES

  • Seyun Kim, Yoonjin Yoon, "On Node Criticality of the Northeast Asian Air Route Network", Journal of Air Transport Management, 80, 101693, 2019
  • Autonomous Vehicle & Cybernetics

    2015 ~ present

    #Real-world experiment #Individual difference #Physiological signals #EEG #ECG

    Inferring Driver Workload with Individualization Using Physiological Data

    The ability to measure and detect driver’s workload has been an important research topic in automotive research domain, and started to attract greater interest in recent years in relation to the emerging vehicle technology such as autonomous driving. Our study incorporates the individual difference to characterize the workload response on personal basis. Extensive pre-processing of electroencephalogram (EEG) and electrocardiogram (ECG) signals were carried out to generate features for personalization. The results showed that human workload response is far from homogeneity, nor the driving environment is a sole determinant.

    SELECTED REFERENCES

  • Yuna Noh, "Modeling Individual Differences in Driver Workload Estimation using Physiological Data", Ph.D Thesis, 2018
  • Yuna Noh, Yoonjin Yoon, "Personalized stress assessment during real-world electric vehicle driving based on fuzzy c-means clustering using physiological and operational data", under review
  • #driver stress #electric vehicle #Information theory #EEG

    Characterizing Driver Stress Using Physiological and Operational Data

    From 53 km Electric vehicle driving experiment of 40 subjects, physiological data including electroencephalogram (EEG) and eye-gazing were obtained along with vehicle operational data such as state of charge, altitude, and speed. The dataset was rich in information, but individual difference and nonlinear patterns made it extremely difficult to draw meaningful insights. As a solution, an information-theoretic framework is proposed to evaluate mutual information between physiological and operational data as well as the entropy of physiological data itself.

    The result shows two groups of subjects, one not showing much evidence of stress and the other exhibiting sufficient stress. Among the subjects who showed sufficient driving, 9 out of the top 10 high EEG-entropy drivers were female, one driver showed a strong pattern of range anxiety, and several showed patterns of uphill climbing anxiety.

    SELECTED REFERENCES

  • Seyun Kim, W. Rhee, D. Choi, Y.J. Jang, Yoonjin Yoon, "Characterizing Driver Stress Using Physiological and Operational Data from Real-world Electric Vehicle Driving Experiment", 19(5), 895-906, International Journal of Automotive Technology, 2018
  • Transportation Data Analytics - Traffic Safety

    2017 ~ present

    #elderly pedestrian #traffic safety #binary logit model #risk factor

    Elderly Pedestrian Safety

    ​Changes in the physical and mental abilities of elderly road users have led to an important question of how to define elderly. With an 8-year collision data set in Seoul, this study investigated the commonality and diversity of pedestrian injuries among the elderly by introducing an additional cutoff age of 75. By employing single and interaction binary logit models, common risk factors were identified for both elderly groups, as well as those that are particularly hazardous to the older-old. With nearly every country experiencing growth in the elderly population, our study strongly suggests that the conventional definition of a single elderly group is no longer relevant and the variety among elderly pedestrians needs to be considered in traffic safety policy.

    SELECTED REFERENCES

  • Yuna Noh, Minjae Kim, Yoonjin Yoon, "Elderly pedestrian safety in a rapidly aging society—Commonality and diversity between the younger-old and older-old." Traffic Injury Prevention, 19(8), 874-879, 2018
  • #elderly driver #traffic safety #road traffic collisions

    Elderly Driver Injury Severity by Seat Positions and Seat-belt Use

    Aging has long been regarded as one of the most critical factors affecting crash injury outcomes. In this study, the confounding effect of occupant age in a vehicle in terms of seat position and seatbelt use was investigated. A multinomial logit framework was adopted to predict two-level injury severity using collision data between 2008 and 2015. The degree of injury severity of elderly occupants was reduced the most with the use of a seatbelt, demonstrating the importance of using seat restraints. The sharp increase in the risk of injury of the older-old group suggests that the age standard of 65 years as the elderly group with regard to traffic safety may require reconsideration due to the growing number of elderly vehicle users on the road.

    SELECTED REFERENCES

  • Yuna Noh, Yoonjin Yoon. "Elderly road collision injury outcomes associated with seat positions and seatbelt use in a rapidly aging society – a case study in South Korea", PLoS ONE, 12(8), e0183043, 2017
  • More Researches

    Aviation System

    Air Traffic Management
    Master Plan - NARAE

    Aviation System Safety
    Management and Reliability
    Centered Maintenance Program Development

    Autonomous Logistics

    Development of Autonomous Mobile
    Agent System in Complex Warehouse

    Risk Management & Evaluation

    Impacts of Volcanic Eruption
    on Aviation System

    Study on EMS Response Time
    Coverage Using Historic Traffic Data
    Publications
    Journal Publications

    Cho, J., & Yoon, Y. (2021). Extracting the topology of urban airspace through graph abstraction. Transportation Research Part C: Emerging Technologies.127, 103116 [Link]

    Y. Shin, Y. Yoon. "Incorporating Dynamicity of Transportation Network With Multi-Weight Traffic Graph Convolutional Network for Traffic Forecasting." IEEE Transactions on Intelligent Transportation Systems, 2020. doi:10.1109/TITS.2020.3031331. [Link]

    Soohwan Oh, Seyun Kim, Yoonjin Yoon, "An Analysis of Runway Accident Precursors Based on Latent Class Model", KSCE Journal of Civil Engineering, 24(9), 2784-2793, 2020 [Link]

    Yuna Noh, Oh Hoon Kwon, Yoonjin Yoon, "Comparative risk factor analyses on bi-level injury severity of taxi and prviate car crashes in Seoul, South Korea", Traffic injury prevention, 21(3), 188-194, 2020 [Link]

    S.E. Lee, J. Jung, Y. Choi, Yoonjin Yoon, J. Hong, "Unmanned Aerial Vehicle Impacts on Heat-Strengthened Glass", IEEE Access, 7, 104269-104278, 2019 [Link]

    Namwoo Kim, Yoonjin Yoon, "Cooperative sUAV Collision Avoidance Based on Satisficing Theory", International Journal of Aeronautical and Space Sciences, 20(4), 978-986, 2019 [Link]

    Seyun Kim, Yoonjin Yoon, "On Node Criticality of the Northeast Asian Air Route Network", Journal of Air Transport Management, 80, 101693, 2019 [Link]

    Seyun Kim, Jiseon Lee, Soohwan Oh, Yoonjin Yoon, "Assessment of the Volcanic Hazard of Mt. Paektu Explosion to International Air Traffic Using South Korean Airspace", Natural Hazards, 96(2), 647-667, 2019 [Link]

    Yuna Noh, Minjae Kim, Yoonjin Yoon, "Elderly pedestrian safety in a rapidly aging society—Commonality and diversity between the younger-old and older-old" Traffic Injury Prevention, 19(8), 874-879, 2018 [Link]

    K. Lee, H. Lee, H. Lee, Yoonjin Yoon, E. Lee, W. Rhee, "Assuring explainability on demand response targeting via credit scoring", Energy, 161, 670-679, 2018 [Link]

    Seyun Kim, W. Rhee, D. Choi, Y.J. Jang, Yoonjin Yoon, "Characterizing Driver Stress Using Physiological and Operational Data from Real-world Electric Vehicle Driving Experiment", 19(5), 895-906, International Journal of Automotive Technology, 2018 [Link]

    J. Han, E. Lee, H. Cho, Yoonjin Yoon, H. Lee, W. Rhee, "Improving the Energy Saving Process with High-Resolution Data: A Case Study in a University Building", Sensors, 18(5), 1606, 2018 [Link]

    ​Jungwoo Cho, Yoonjin Yoon, "How to Assess the Capacity of Urban Airspace: A Topological Approach Using Keep-in and Keep-out Geofence", Transportation Research: Part C, 92, 137-149, 2018 [Link]

    Sameer Ud-din, Yoonjin Yoon, "Analysis of Loss of Control Parameters for Aircraft Maneuvering in General Aviation", Journal of Advanced Transportation, 7865362, 2018 [Link]

    Yuna Noh, Yoonjin Yoon. "Elderly road collision injury outcomes associated with seat positions and seatbelt use in a rapidly aging society – a case study in South Korea", PLoS ONE, 12(8), e0183043, 2017 [Link]

    Jungwoo Cho, M. You, Yoonjin Yoon, "Characterizing the influence of transportation infrastructure on Emergency Medical Services (EMS) in urban area – a case study of Seoul, South Korea", PLoS ONE, 12(8), e0183241, 2017 [Link]

    Oh Hoon Kwon, W. Rhee, Yoonjin Yoon, "Application of classification algorithms for analysis of road safety risk factor dependencies", Accident Analysis & Prevention, 75, 1-15, 2015 [Link]

    Oh Hoon Kwon, K. Jang, Yoonjin Yoon, "Evaluating the effectiveness of the law banning handheld cellphone use while driving", Safety Science, 70, 50-57, 2014 [Link]

    S. Jung, K. Jang, Yoonjin Yoon, S. Kang, "Contributing factors to vehicle to vehicle crash frequency and severity under rainfall", Journal of Safety Research, 50, 1-10, 2014 [Link]

    J.W. Lee, J.Y. park, H.J. Jung, J.B. Lee, Yoonjin Yoon, "Optimization of building window system in Asian regions by analyzing solar heat gain and daylighting elements", Renewable Energy, 50, 522-531, 2013 [Link]

    H. Yeo, Yoonjin Yoon, S. Madanat, "Algorithms for bottom-up maintenance optimization for heterogeneous infrastructure systems", Structure and Infrastructure Engineering, 9(4), 317-328, 2013 [Link]

    S. Jung, X. Qin, Yoonjin Yoon, "Evaluation of motorcycle safety strategies using the severity of injuries", Accident Analysis & Prevention, 59, 357-364, 2013 [Link]

    Yoonjin Yoon, M. Hansen, M. O. Ball, "Optimal route decision with a geometric ground-airborne hybrid model under weather uncertainty", Transportation Research: Part E, 48(1), 34-49, 2012 [Link]

    Conference Proceedings

    J. Cho, Y. Yoon. "Segmentation of Low-altitude Airspace in Highly Constrained Environments", ICRAT(International Conference on Research in Air Transportation), 2020

    N. Kim, Y. Yoon. "How to assess the feasibility of sUAS applications in urban environment: geodemographic analysis of 3D urban space", ICRAT(International Conference on Research in Air Transportation) Doctoral Symposium, 2020

    S. Kim, Y. Shin, Y. Yoon. "Topological Data Analysis on the Northeast Asian Air Route Network", ICRAT(International Conference on Research in Air Transportation) Doctoral Symposium, 2020

    S. Oh, J. Cho, N. Kim, Y. Yoon. "Preliminary Impact Assessment of Restricting Airspace Over Populated Areas for sUAS Operation". Transportation Research Board 99th Annual Meeting, 2020

    S. Oh, Y. Yoon. "Assessing the impact of restricting airspace in populated areas on airspace availability for UAV Operation". The 32nd KKHTCNN Symposium, 2019

    N. Kim, Y. Yoon. "A study on the urban airspace for sUAV operation". The 32nd KKHTCNN Symposium, 2019

    Y. Shin, Y. Yoon. "Reflecting Structural Dynamicity of Traffic Networks to Graph Convolution Modules: A Deep Learning Approach to Traffic Forecasting". The 32nd KKHTCNN Symposium, 2019

    S. Kim, Y. Yoon. "Weighted Complex Network Analysis of the Northeast Asian Air Route Network". The 32nd KKHTCNN Symposium, 2019

    Y. Noh, S. Kim, Y. Yoon. "Evaluation on Diversity of Drivers' Cognitive Stress Response using EEG and ECG Signals during Real-Traffic Experiment with an Electric Vehicle". 2019 IEEE INTELLIGENT TRANSPORTATION SYSTEMS CONFERENCE (ITSC), 2019

    NW. Kim, Y. Yoon, "A Study on Airspace Availability of Urban Areas". The 23rd ATRS(Aviation Transport Research Society) World Conference, 2019

    S. Kim, Y. Yoon, "Robustness Analysis of the Northeast Asian Air Transport Network as a Complex Network". The 23rd ATRS(Aviation Transport Research Society) World Conference, 2019

    J. Cho, Y. Yoon. "Extraction and Interpretation of Geometrical and Topological Properties of Urban Airspace for UAS Operations". 13th ATM R&D Seminar, 2019

    N. Kim, Y. Yoon. "sUAV Collision Avoidance Strategies Based On Satisficing Game Theory". The 31st KKHTCNN Symposium, 2018

    S. Kim, Y. Yoon. "Topological Properties of the Northeast Asian Air Transport Network as a Complex Network". The 31st KKHTCNN Symposium, 2018

    J. Cho, Y. Yoon. "Preliminary Study on Routing Strategies for sUAS Operations in Urban Environments". The 31st KKHTCNN Symposium, 2018

    Y. Shin, Y. Yoon. "Data-Driven Approach to Urban Transportation Road Network Analysis Using Topological Data Analysis – Case Study on Gangnam District, Seoul". The 31st KKHTCNN Symposium, 2018

    S. Oh, Y. Noh, Y. Yoon. "Characterizing the influence of elderly taxi drivers to road safety in ageing society – a case study of Seoul, South Korea". The 31st KKHTCNN Symposium, 2018

    Y. Yoon, "Data-Driven Approach to Aviation Safety Management - a Case Study on Association between Runway Incidents and Turnaround Time in South Korean Airports", Transportation Research Board, 2018

    J. Lee, Y. Noh, S. Kim, S. Oh, Y. Yoon. "Assessing the impact of introducing high-speed rail on demand of railway in Korea". The 2nd Asian Conference on Railway Engineering and Transportation, 2018

    Y. Shin, J. Cho, NW. Kim, Y. Yoon. "Predicting Seoul Subway Hourly Passenger Demand Using Neural Network Models". The 2nd Asian Conference on Railway Engineering and Transportation, 2018

    NW. Kim, Y. Yoon, "Conflict Resolution Policy for Small UAV Based on Satisficing Theory". The 22nd ATRS(Aviation Transport Research Society) World Conference, 2018

    J. Cho, Y. Shin, Y. Yoon. "Investigating the effect of alternative geofencing on the availability of low-altitude urban airspace". The 22nd ATRS(Aviation Transport Research Society) World Conference, 2018

    J. Cho, Y. Yoon. "Assessing the airspace availability for sUAV operations in urban environments: A topological approach using keep-in and keep-out geofence", ICRAT(International Conference on Research in Air Transportation) Doctoral Symposium, 2018 

    MJ. KIm. J. Cho. Y. Yoon. "Investigation of Patient Concentration Phenomenon in Emergency Departments Considering Transportation Costs", International Federation of Operational Research Societies(IFORS), 2017

    S. Kim. J. Cho. Y. Yoon. "Simulation-based Assessment of Unmanned Aerial Vehicles Traffic Congestion in Metropolitan Area", International Federation of Operational Research Societies(IFORS), 2017

    J. Lee. Y. Yoon. "A study on the Railway Demand for Seoul to Major City of Gyeongbu Line in the Past 12 Years Using Outlier Detection", The 29th KKHTCNN Symposium, 2016

    S. Oh. Y. Yoon. "A study on the Mitigation of Airspace Delay in Hong Kong International Airport", The 29th KKHTCNN Symposium, 2016

    MJ. Kim, Y. Yoon. "Effectiveness of school zone improvement program in Dongdaemun-gu", The 29th KKHTCNN Symposium, 2016

    S. Kim. Y. Yoon. "A study on Electric Vehicle Drivers' Battery Anxiety with EEG Signal Analysis", The 29th KKHTCNN Symposium, 2016

    J. Cho, Y. Yoon. “UAV traffic in urban airspace: A simple measure of conflict”, The 29th KKHTCNN Symposium, 2016

    Y. Noh, Y. Yoon, "Tactical Traffic Control for Multiple AGV Systems based on Three Dimensional Space", AIP Conference Proceedings. 2016

    D. Jin, S. Kim, Y. Yoon, "Identifying Range Anxiety of Electric Vehicle Drivers using Psychophysiological Measures"  INFORMS 2016

    Y. Noh, Y. Yoon, "Tactical Traffic Control for Multiple AGV Systems Based on Three Dimensional Space" INFORMS 2016

    Y. Woo, Y. Yoon, "Comparative Analysis of Various Population Groups in Car Collision Based on Collision Risk Factors Using Data Mining Technique" INFORMS 2016

    J. Lee, Y. Yoon, "A Quantitative Approach to Assessing the Impact of the Mt. Baekdu Explosion on South Korea’s Air Traffic Flow in a Volcanic Ash Dispersal Scenario", International Conference on Research in Air Transportation, 2016

    J. Cho, Y. Yoon, "GIS-based Analysis on Vulnerability of Ambulance Response Coverage to Traffic Condition", IEEE ITSC (Intelligent Transportation Systems Conference), 2015

    J. Lee, Y. Yoon. "Impact of the Mt. Baegdu explosion to South Korea’s air traffic flow" Transport Research Board, 2015

    O. Kwon. Y. Yoon. W. Rhee. “Analysis of Risk Factor Dependency Applying Data Mining Techniques to Traffic Accident Data” International Conference on Computational & Experimental Engineering and Sciences 2014

    Y. Yoon. “Adaptive Risk Modeling Method using Hazard Matrix for Proactive Transportation Safety Management” International Conference on Computational & Experimental Engineering and Sciences 2014

    O. Kwon, Y. Yoon. "Analysis of risk factor dependency using traffic accident data". The 8th AOTULE meeting and conference. 2013

    Y. Yoon, S. Jung, K. Jang, S. Kang, “Impacts of influential factors on vehicle to vehicle crash frequency and severity in rainy weather”, Transport Research Board, 2013

    S. Jung, X. Qin, Y. Yoon, “Evaluation of motorcycle safety strategies using the severity of injuries”, Transportation Research Board, 2013

    K. Kim, Y. Yoon, “Link criticality based on most probable network states for predisaster investment”, ASCE workshop on computing in civil engineering, 2013

    Y. Noh, Y. Yoon, “A perspective on occurrence in aviation safety management of South Korea through survey on various occurrence categories”, Air Transport Research Society, 2013

    S. Tak, D. Lee, Y. Yoon, “Study on occurrence categories and accident-related events based on the accident reports of the Republic of Korea”, Air Transport Research Society, 2013

    ​K. Kim, J. Lee, Y. Yoon, “A framework to determine critical links of an intercity rail network for pre-disaster infrastructure”, INFORMS 2013

    E. Kim, Y. Yoon, “Hazard risk assessment in aviation: methodology and case study based on NTSB accident/incident data”, INFORMS 2013

    O. Kwon, Y. Yoon, “Application of Bayesian network for hazard-based risk modeling in aviation safety management system”, INFORMS 2013

    Y. Noh, Y. Yoon, “Occurrence in aviation safety management of South Korea: survey on various occurrence categories”, INFORMS 2013

    J. Lee, Y. Yoon, “Aviation system reliability during natural disaster”, INFORMS 2013

    Y. Yoon, M. Hansen, “Value of perfect weather information in the probabilistic air traffic flow management: an application of the geometric recourse model”, International Conference on Research in Air Transportation, 2012

    Y. Yoon, M. Hansen, M. O. Ball, “Optimal route decision with a geometric ground-airborne hybrid model under weather uncertainty”, International Symposium on Transportation and Traffic Theory, 2012

    Y. Yoon, M. Hansen, M. O. Ball, “Optimal route generation with geometric recourse model under weather uncertainty”, International Conference on Research in Air Transportation, 2010

    S. Tak, Y. Yoon, “A framework to evaluate system-wide vulnerability of a transportation network under disaster events”, INFORMS 2012

    O. Kwon, Y. Yoon, “Understanding the human behavior in the traffic accident using data mining framework”, INFORMS 2012

    Y. Yoon, M. Hansen, “Value of perfect weather information in the probabilistic air traffic management”, INFORMS 2012

    Y. Yoon, M. Hansen, M. O. Ball, “Geometric recourse model for optimal route generation”, INFORMS 2009

    Y. Yoon, M. Hansen, “Optimal reroute strategy under weather uncertainty”, INFORMS 2008

    Y. Yoon, M. Hansen, “Modeling stochastic evolution of runway capacity using data mining concepts”, International Conference on Research in Air Transportation, 2008

    Y. Yoon, M. Hansen, “Modeling stochastic evolution of runway capacity using data mining concepts”, INFORMS 2007

    Y. Yoon, M. Hansen, "The impact of advanced technology on Next Generation Air Transportation: A  case study of Required Navigation Performance (RNP)", AIAA Modeling and Simulations Technology Conference, 2007​​

    Conference Presentation (National)

    신유열, 윤윤진, "Traffic speed prediction in urban mobility system using taxi GPS tracking data." 2020 한국추계경영과학회, 2020

    조정우, 윤윤진, "Overview of current UAM concept of operation and researches." 2020 한국추계경영과학회, 2020

    김남우, 윤윤진, "Graph-based clustering of urban airspace with spatial constraints for UAM applications in NY and SF." 2020 한국추계경영과학회, 2020

    김남우, 윤윤진. "Satisficing Theory based Cooperative Conflict Resolution Strategy for Multiple Small Unmanned Aerial Vehicles",  한국경영과학회 추계학술대회, 2017

    김민재, 노유나, 윤윤진. "서울시 노인 보행자 교통사고의 부상 심각도 영향 평가", 한국경영과학회 추계학술대회, 2017

    노유나, 윤윤진. "Personalized Driving Stress Recognition of Electric Vehicle in Physiological Signals", 한국경영과학회 추계학술대회, 2017

    조정우, 윤윤진. "Identification of Risk-Resilient Air Space for sUAV Operations in a highly urbanized area", 한국경영과학회 추계학술대회, 2017

    노유나, 윤윤진. "서울시 교통사고 노인 탑승자의 좌석 위치 및 안전벨트 사용에 따른 부상심각도 영향 평가", 춘계공동학술대회(대한산업공학회, 한국경영과학회, 한국시뮬레이션학회) , 2017

    김세윤, 장영재, 윤윤진. "생체신호를 활용한 주행 데이터 기반 운전자의 스트레스 추정 기법 연구", 춘계공동학술대회(대한산업공학회, 한국경영과학회, 한국시뮬레이션학회) , 2017

    조정우, 윤윤진. "교통 네트워크 및 데이터 기반 응급의료서비스 접근성 분석", 춘계공동학술대회(대한산업공학회, 한국경영과학회, 한국시뮬레이션학회) , 2017

    김남우, 신유열, 윤윤진. "이타적 충돌회피 이론 기반 무인비행장치 충돌회피 성능 요건 분석", 춘계공동학술대회(대한산업공학회, 한국경영과학회, 한국시뮬레이션학회) , 2017

    김민재, 조정우, 윤윤진.  "GIS 네트워크 분석을 통한 서울시 응급의료서비스 이송시간 분석", 춘계공동학술대회(대한산업공학회, 한국경영과학회, 한국시뮬레이션학회) , 2017

    Y. Kang, J, Lee. Y, Yoon. "서울시 어린이 보행자 사고 위험요인 분석에 관한 연구"  The 75th Conference of Korean Society of Transportation 2016

    ​S. Kim., Y. Noh., Y. Yoon. “격자기반 물류창고에서의 복수 운송로봇 교통제어 알고리즘 연구” The 72th Conference of Korean Society of Transportation 2015

    S. Kim. Y. Yoon. “의사결정나무를 이용한 고속도로 교통사고 시설 피해액 분석” The 72th Conference of Korean Society of Transportation 2015

    J. Cho. Y. Yoon. “교통정보 및 지리정보체계를 반영한 구급차 출동범위 분석” The 72th Conference of Korean Society of Transportation 2015

    J. Lee, Y. Yoon, "항공서비스제공자의 안전성과지표에 대한 사례연구" The 72th Conference of Korean Society of Transportation 2015

    Theses

    Ph.D

    J. Cho. "Urban Airspace Availability Assessment Framework and Its Applications Using Geometric and Topological Algorithms" 2020

    Y. Noh. "Modeling Individual Differences in Driver Workload Estimation using Physiological Data" 2018

    S. Ud-din. "Analysis of Loss of Control-Inflight Parameters for Aircraft Maneuvering in General Aviation" 2018

    O, Kwon. "Study on safety risk factors in traffic accidents using data mining techniques" 2014

    Masters

    MJ. Kim. "Model of Elderly Pedestrian Crash Injury Outcomes Associated with Crash Characteristics in Seoul" 2018

    NW. Kim. "Game Theoretic Collision Avoidance Algorithms for Small UAV" 2017

    Y. Kang. "A Study of Traffic Accident Factor Analysis and Prediction Modeling for Children Pedestrian in Urban Area" 2016

    S. Kim. "Identifying Range Anxiety of Electric Vehicle Drivers Using Psychophysiological Measures" 2016

    Y. Woo. "Evaluation of Collision Risk Factors Affecting Injury Severity for Various Collision Groups Using Data Mining Technique" 2016

    J. Cho. "Evaluation of traffic effect to emergency medical services response time in urban area" 2015

    Q. Hussain. "Traffic crash severity analysis of old age drivers using data mining approach" 2015

    E.S. Kim. "A study of urban roadway and non-commercial aviation safety based on the risk factor analysis" 2014

    D. Lee. "A study on variation of geometric recourse model by considering route change under weather uncertainty" 2014

    E.H. Kim. "A single hazard-based matrix method for data-driven risk assessment in aviation" 2014

    Y. Zhao. "Two vehicle truck-involved crash severity model using ordered logit regression" 2012

    K. Song. "A study on the development and implementation of korean next generation air transportation system" 2012

    Yoonjin Yoon

    Professor


    ​​B.S. Mathematics, SNU
    M.S. Computer Science, Stanford
    M.S. Management Science and Engineering, Stanford
    Ph.D. Civil and Environmental Engineering, UC Berkeley


    Stochastic Modeling & Optimization, System Safety
    Air Traffic Management
    Aviation Safety
    Urban and Transportation Data Analytics
    Urban Disaster Response and Evacuation Modeling


    CE351 - Civil and Environmental Engineering Data Analysis
    CE452 - Advanced Transportation System Engineering
    CE545 - Applications of Artificial Intelligence to Transportation System Analyses
    People

    Jungwoo Cho

    2020.03~

    jjw9171@kaist.ac.kr

    Research Staff

    Seyun Kim

    2021.03~

    whataud@kaist.ac.kr

    Research Staff

    Jiseon Lee

    2013.09~

    easysun@kaist.ac.kr

    Ph.D. Candidate

    Namwoo Kim

    2017.09~

    ih736x@kaist.ac.kr

    Ph.D. Candidate

    Soohwan Oh

    2017.09~

    suhwan@kaist.ac.kr

    Ph.D. Candidate

    Yuyol Shin

    2017.09~

    yuyol.shin@kaist.ac.kr

    Ph.D. Candidate

    Haechan Cho

    2020.09~

    gkqkemwh@kaist.ac.kr

    MS Candidate

    Hyeyeong Lee

    2021.03~

    leehy305@kaist.ac.kr

    MS Candidate

    Gwanghwan Seong

    2021.03~

    skhshk@kaist.ac.kr

    MS Candidate

    Alumni

    Ohhoon Kwon

    ~2015.02 (Ph.D)

    Sammer Ud Din

    ~2018.02 (Ph.D)

    Yuna Noh

    ~2018.02 (Ph.D)

    Minjae Kim

    ~2018.02 (M.S.)

    Yoonjung Kang

    ~2016.08 (M.S.)

    Yeonghwa Woo

    ~2016.02 (M.S.)

    Qundeel Hussain

    ~2015.02 (M.S.)

    Eunseok Kim

    ~2014.08 (M.S.)

    Donghun Lee

    ~2014.02 (M.S.)

    Eunhye Kim

    ~2014.02 (M.S.)

    Yingping Zhao

    ~2012.08 (M.S.)

    Kyowon Song

    ~2012.08 (M.S.)
    Contact


    TEL +82-42-350-5655
    Address W16 #407, KAIST, 291 Daehak-ro, ​Yuseong-gu, Daejeon, Republic of Korea
    E-mail true@kaist.ac.kr