Konstantinos Kepaptsoglou

Konstantinos Kepaptsoglou
National Technical University of Athens | NTUA · School of Rural and Surveying Engineering

Ph.D.

About

130
Publications
28,485
Reads
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1,672
Citations
Additional affiliations
July 2016 - present
National Technical University of Athens
Position
  • Professor (Assistant)
July 2014 - June 2016
National Technical University of Athens
Position
  • Lecturer
July 2014 - June 2016
National Technical University of Athens
Position
  • Lecturer
Education
June 2006 - November 2009
National Technical University of Athens
Field of study
  • Transportation Engineering
August 1999 - July 2000
Purdue University
Field of study
  • Civil Engineering (Transportation and Infrastructure Systems)
September 1994 - June 1999
National Technical University of Athens
Field of study
  • Civil Engineering

Publications

Publications (130)
Article
Efficient timetable and speed profile determination are critical in improving the energy performance of railway systems. Relevant speed profile optimization models for railway systems typically aim at the minimization of energy consumption and passenger waiting times. Still, passenger comfort during the accelerations and decelerations of the train...
Article
Full-text available
Technological changes in the automobile industry accelerate the development of alternative fuel vehicles and automated driving. These changes affect the vehicle fleet mix in urban areas, and affect the total cost of ownership (TCO) per vehicle technology. The goal of this paper is to expand the traditional TCO model to enable the comparison of vehi...
Article
Full-text available
E-scooter sharing services have grown exponentially in many cities of the world within the last 10 years, mainly with the goal to serve first/last mile trips. Compared to other shared mobility modes (e.g., autonomous buses and electric taxis), for which Agent-based Models (ABMs) have been applied in many cases, just a few studies attempted to simul...
Article
The transition to new forms of urban transport, which are environment friendly, efficient, and cost-effective has become a pressing issue of modern times. Battery electric buses are being deployed worldwide, marking a change in public transport planning and operations. The emergence of fast and ultra-fast wireless charging for electric buses has br...
Article
Urban communities should now build in specific measures, addressing multimodality and fair distribution of public space. The transformation of arterials into multimodal corridors can be a key strategy that will shape new futures. The social acceptance of “push” measure that aim to modify road space allocation have never been examined following quan...
Article
Metro systems are critical public transport elements in several metropolitan areas around the world. Unexpected disruptions may undermine service provision of metro systems, and thus addressing their negative impacts is of primary importance. A first step towards developing mitigation measures involves the identification of those critical metro sta...
Conference Paper
Full-text available
This study focuses on the concept of shared space, which encourage road users to share the same road space with little physical or visual separation. It contributes to defining traffic parameters in shared space network links by testing three hypotheses, a) high volume of bicycles and pedestrians (vulnerable road users VRUs) leads to higher traffic...
Conference Paper
Full-text available
New transportation strategies, which aspire to create sustainable and resilient cities, prioritise active and public transport modes. Because these interventions have multiple effects, an integrated approach in planning became necessary. The aim of this paper is to determine transportation and land use impacts from active travel schemes using a Lan...
Conference Paper
Full-text available
CERN, καθώς επίσης αξιολογεί ενδεχόμενες λύσεις για τη δημιουργία ενός βιώσιμου συστήματος μεταφορών για την κοινότητα του CERN. Για να αναλυθούν οι συνήθειες μετακίνησης και η ικανοποίηση των μελών της κοινότητας του CERN, αναπτύχθηκαν μοντέλα δηλωμένων και αποκαλυπτόμενων προτιμήσεων. Στη συνέχεια, δομήθηκαν και αξιολογήθηκαν διαφορετικές πολιτικ...
Article
In an era of complexity, rapid technological advance and need for climate change action, urban roads may need to transform. The aim of this research is to identify the concepts underpinning the fundamental dimensions of the future urban road and open up an interdisciplinary dialogue about its delivery. We used a combinatorial approach incorporating...
Article
E-scooters have emerged in recent years as an innovative and user-friendly transportation mode in urban areas worldwide. However, their incorporation in urban road networks is complex, since legal, social, and technical considerations often arise with respect to their usage. As official regulatory frameworks are often lacking, micromobility operato...
Article
The taxi industry has changed dramatically during the last decade, as ride-sourcing applications, ride-sharing and alternative pricing schemes have emerged, either as complementing or competitive services and strategies. After some years of familiarity with such trends, it is interesting to explore where the taxi industry stands with respect to pos...
Conference Paper
Over the last 10 years, transport policy experts are getting skeptical in regards to using each of traditional policy assessment methods, like Cost-Benefit Analysis (CBA), as the sole tool to evaluate transportation policies/projects. They argue that they do not provide any information regarding the distribution of policy effects across different p...
Article
Battery Electric Vehicles (BEVs) have been in the market for over 10 years; however, their market diffusion has been slow despite their environmental and social advantages. Their high purchase cost is one of the most significant barriers towards their wider adoption. Policy makers have used the Total Cost of Ownership (TCO) estimate to expose the l...
Article
Electric bus networks are steadily gaining ground as the prominent option for urban public transport. However, in contrast to conventional transit systems operated by diesel buses, electric bus networks are particularly vulnerable with respect to energy supply, both in terms of power level availability and the unobstructed access to charging points...
Article
This paper models and investigates risk and security perception of metro travelers, in cases of malevolent, man-made incidents. Data is collected through an extensive survey in Athens, Greece; the survey includes an image-based stated-preference experiment, depicting different risk and security conditions. Econometric models are developed for estim...
Conference Paper
The introduction of electric motor vehicles and the continuous research on automated vehicles introduces new features when evaluating and comparing their lifecycle costs to existing hybrid technologies. This study expands the traditional TCO value and integrates time costs to compare the performance of three different vehicle technologies: Hybrid E...
Article
Full-text available
Either a result of inadequate supply or perceived high costs, illegal parking is an often-encountered phenomenon in urban areas worldwide and affects the performance and safety conditions of streets. In Greek cities in particular, illegal parking seems to be mostly observed when legal parking supply is limited, while at the same time, there is avai...
Conference Paper
Advances in technology and alternative fuels change the on-road vehicle fleet mix, which traditionally depends on internal combustion vehicles. These changes affect also the total cost of ownership (TCO) per vehicle technology and their market penetration rates. The goal of this paper is to identify indicators for a TCO based analysis for three veh...
Article
Full-text available
The purpose of this paper is to provide a methodological framework to identify traffic conditions based on non-calibrated video recordings captured from unmanned aerial vehicles (UAV) using deep learning. To this end, we propose two complementary to each other approaches: (i) identify in real time, with minimal computational cost, traffic condition...
Article
Electrification of surface transportation networks has the potential to reduce oil consumption and transport-related emissions, with many relevant projects currently underway worldwide. Typically, transition to electric public transport services is gradual, as operators select specific lines to electrify during initial stages of electric vehicle de...
Article
The COVID-19 outbreak led to significant changes in daily commuting. As lockdowns were imposed to metropolitan areas throughout the globe, travelers refrained heavily from using public transport, to maintain social distancing. Based on data from Athens, Greece, this paper investigates the anticipated, post-pandemic behavior of travelers with respec...
Article
Continuous Approximation (CA) models have been used to solve transportation problems due to their ability to efficiently model complex transportation systems and offer flexibility in testing alternative policies. The current study develops a CA model for optimizing transportation planning for ferry services. The model is tested in a case study for...
Article
The transformation of urban roadways into pedestrian streets is a popular measure for reshaping city parts and enhancing their livability. Nevertheless, pedestrianization schemes are expected to have some impact on the performance of the neighboring road network, especially if these are established ad-hoc or solely based on non-transport criteria....
Article
Fare evasion is often encountered in public transport and results in severe revenue loss for operators. Using data from the Athens Metro system, this paper attempts to capture the extent of fare evasion, analyze its causes and identify attributes of passengers who practice fare evasion. Perceived effectiveness of measures that can restrict its prac...
Article
Full-text available
Efficient operation of bus networks is vital for urban centers. Unfortunately, factors such as uneven passenger loads and congestion hinder the adherence to posted schedules, leading to reliability issues. Most notably, bus bunching has been identified as a significant reliability problem, impacting both users and operators. Bus bunching is treated...
Article
Full-text available
Rapid transit (RT) systems are becoming increasingly attractive in the developing world as they improve transportation and mobility conditions in urban areas, reduce motorization impacts and offer high quality, yet cost effective services to travelers. Light rail transit (LRT) and bus rapid transit (BRT) are RT systems that combine high capacity wi...
Article
The objective of this paper is to identify hot spots of bus bunching events at the network level, both in time and space, using Automatic Vehicle Location (AVL) data from the Athens (Greece) Public Transportation System. A two-step spatio-temporal clustering analysis is employed for identifying localized hot spots in space and time and for refining...
Article
Emission screening and control for motorized traffic is mandatory in most countries worldwide. However, there may be cases that periodic inspections in permanent establishments may be inefficient and fail to enforce emission regulations among moving vehicles. In such cases, authorities deploy mobile inspection units, which perform random vehicle em...
Article
Full-text available
We investigate the application of a solar-powered bus route to a small-scale transportation system, as such of a university campus. In particular, we explore the prospect of replacing conventional fossil fuel buses by electric buses powered by solar energy and electricity provided by the central grid. To this end, we employ GIS mapping technology t...
Article
Full-text available
Abstract Intelligent Transportation Systems (ITS) applications in public transportation have allowed for automated data collection, which is particularly useful for planning and operations. While technological advancement of ITS has so far been extensive, their usage for developing relevant planning and operational tools is rather limited. Research...
Article
Full-text available
Man-man, life-threating incidents such as terrorist attacks, can have a significant impact in travel behavior and public transport ridership. Based on data collected from an extensive personal interview survey undertaken in Athens (Greece), factors affecting post-incident recovery time of metro users (i.e. the time till travelers will start re-usin...
Article
The emergence of electromobility along with recent developments in wireless power transfer (WPT) technology offer potentials to improve the carbon footprint of bus transport, while offering quality services. Indeed, the deployment of fast charging stations and dynamic charging roadway segments (lanes) can ensure fast energy transmission to electric...
Article
Full-text available
This paper critically reviews applications of metaheuristics for solving the Transit Route Network Design Problem (TRNDP). A structured review is offered and prominent metaheuristics for tackling the TRNDP are evaluated, according to a benchmark network. The review findings yield a unified implementation framework, which contains common algorithmic...
Article
Electric buses have long been recognized as a promising direction for offering sustainable public transportation services. While range and battery performance constraints have hindered the widespread adoption of electric buses in the past, technological advances make them a prominent and attractive option for public transportation in the future. St...
Poster
Full-text available
We explore the prospect of replacing conventional university campus buses powered by fossil fuels with ones using solar energy. The proposed research investigates the emerging technology of solar powered road panels within a stochastic framework in order to optimally determine the corresponding infrastructure requirements for a university circulato...
Article
Efficient and safe rail transit (metro) operations require regularly inspected and properly maintained infrastructures. While preventive maintenance is usually undertaken following a predetermined schedule, decisions on repairs and corrective maintenance are usually scheduled ad hoc, following inspections. This paper presents a model for optimally...
Article
Despite their inherent vulnerability to structural and functional degradation, transportation networks play a vital role in the aftermath of disasters by ensuring physical access to the affected communities and providing services according to the generated needs. In this setting of operational conditions and service needs which deviate from normal,...
Chapter
Travel time perception modeling and analysis is required for the planning, design and evaluation of public transportation systems. Often, changes in socioeconomic conditions may have an impact to the perception of public transportation travelers as for their perception of travel time components. Using stated preference data from Athens, Greece, thi...
Poster
Cooperative Intelligent Transportation Systems (c-ITS) has been argued to be beneficial to the economic and environmental sustainability and add to the quality of life in urban cities. As the wide implementation of these systems demands significant investment, it is important to gauge public acceptability, before they come to implementation. To thi...
Article
Full-text available
The first/last mile problem in urban transportation services refers to limited connectivity and accessibility to high capacity commuter lines. This is often encountered in low-density residential areas, where low flexibility and resources of traditional public transportation systems lead to reduced service coverage. Demand-responsive transit (DRT)...
Article
Electric vehicles (EVs) are inevitably environmental friendly and energy efficient alternatives compared to their thermal counterparts. However, dependency on battery capacity and extensive charging duration have hindered the widespread adoption of EVs. Recently, on-line electric vehicles (OLEVs) which exploit inductive charging and are able to cha...
Conference Paper
Service regularity is one of the most significant performance indicators for public transport routes, typically measured through headway adherence. When headway deviations become too large and corresponding headways very small, bus bunching typically occurs. In these cases, passengers experience larger waiting times and overcrowding and an overall...
Article
Curbside parking is associated with various adverse impacts on urban traffic networks and is rarely recommended. However, there are cases where parking demand dictates the establishment of on-street parking lanes. Proper planning of the number and type of curbside parking lanes to be located is essential for maximizing roadway capacity and minimizi...
Article
Decisions on efficient detours are crucial for motorway operations following closures. This paper presents a framework for supporting decision making on detour routing in urban motorways. A Route Efficiency Index (REI) is developed for that purpose; the index is based on three major criteria: safety, user cost and environmental impacts in the vicin...
Article
The transportation decision-making process is complicated in that it often involves conflicting interests and expectations of different stakeholders. To ensure achieving sound decisions, various performance criteria in economic, social, and environmental dimensions are typically utilized to assess and prioritize investment alternatives. This paper...
Article
Full-text available
The deep economic recession in Greece has significant effects on urban lifestyle. Negative economic conditions with serious consequences in everyday life, such as the loss of 25-30% of GDP within five years and an unemployment rate over 25% have impacts on urban mobility. Less expenditure for transportation resulted less cars on the roads, increase...
Article
Energy security is important for islands not connected to mainland electricity grids. The Aegean archipelago comprises scattered islands, whose electricity supply relies on oil-based thermal power plants. These islands attract large numbers of tourists, while the archipelago is an environmentally sensitive area. Efficient maritime transportation of...
Article
The successful introduction of LRT systems is inevitably related to the realistic estimation of their ridership; this is particularly true for cases of no prior experience in the use of such modes in the part of the traveling public. This paper presents a practical approach for developing a direct demand model, for the case of a planned LRT system...
Article
Light rail transit systems (LRTs) are attractive options for modern communities as they offer high quality, sustainable public transportation services. However, investment costs often may make their application for medium-sized cities prohibitive, particularly if no significant social benefits are achieved. Guided light transit (GLT) has been intro...
Article
The use of intelligent transport systems for the provision of real-time passenger information is an important incentive in efforts to strengthen the role of public transport and improve livability in large cities. Electronic signs installed at bus stops to disseminate information on bus arrivals are an important component of these systems with a si...
Article
Performance evaluation of transit system elements is a required process for decision makers willing to redesign its structure, operations, and services. In this paper, we employ Data Envelopment Analysis and neural network regression to investigate the efficiency of bus depots and lines for the Athens (Greece) bus system. Results reveal differences...
Poster
Full-text available
We offer an ex-ante evaluation of a dynamic pricing policy, a popular remedial measure against traffic congestion, for the case of Athens, using simulation. A tailor made Application Programming Interface to charge drivers willing to access congested areas at certain time, based on real time transportation data, is developed.
Article
Congestion pricing is a popular remedial measure against traffic congestion worldwide. It targets at limiting traffic in downtown city areas by imposing fees to drivers willing to access certain city areas during particular time periods. We offer an ex-ante evaluation of congestion pricing impacts for the case of Athens, Greece. An urban toll struc...
Article
Full-text available
While metro disruptions can have a significant impact to the travel patterns and behavior of users, research on that topic has been limited. Using Athens, Greece, as a study case, this paper combines information on traveler experiences and perceptions and attempts to model mode choice during a long-run metro service disruption. A Nested Logit (NL)...
Article
During and after a disaster, transportation network management is a complex task. In a state of limited serviceability and functionality, surviving transportation infrastructure is expected to act as a vital lifeline and to support different types of operations. This study investigates the joint planning of evacuation operations and emergency traff...
Article
Seaplanes offer a time and cost-efficient service for supporting transportation needs in island chains. This paper investigates the design of a seaplane network connecting the Greek islands with the mainland, a service currently accommodated by ferries. Design of seaplane routes is modeled as a multi-objective capacitated vehicle routing problem wi...
Article
Sustainability is a requirement for modern public transportation networks, as these are expected to play a critical role in environment-friendly transportation systems. This paper focuses on developing an efficient model for solving a sustainable oriented variant of the Transit Route Network Design Problem. The model incorporates sustainable design...
Chapter
Full-text available
Major highway infrastructure elements, in need of post-earthquake maintenance for improved highway life-cycle, motorist’s guidance, and safety, include bridges, pavements, interchanges, and tunnels. In addition, there are numerous, minor infrastructure elements vital to motorist’s guidance and safety, such as overhead and roadside appurtenances, in...
Article
Full-text available
A methodological framework for multiple steps ahead parking availability prediction is presented. Two different types of predictions are provided: i. the probability a free space to continue being free in subsequent time intervals, and ii. the short-term parking occupancy prediction in selected regions of an urban road network. The available data c...
Article
Weather conditions have a strong effect on the operation of vessels and unavoidably influence total time at sea and associated transportation costs. The velocity and direction of the wind in particular may considerably affect travel speed of vessels and therefore the reliability of scheduled maritime services. This paper considers weather effects i...
Article
The role of public transportation is particularly important in periods of economic recession, as transit systems are expected to offer low cost, equitable services, under decreased revenues and the need for expenditure cut-backs. In such an environment, re-structuring of transit system operations is essential for retaining an adequate level of serv...
Article
This is the second part of a two-part survey investigating transportation network post-disaster planning and management. The first part focused on efforts and models for the estimation and assessment of post-disaster network performance (PDNP). This paper addresses the problem of decision-making and planning of post-disaster network operations (Pos...
Article
In recent years, disasters have an increasing impact on modern societies in terms of both economic and human losses. Following disasters, transportation networks act as key lifelines enabling access to the affected communities and supporting evacuation, emergency response, relief and recovery operations. In this context, this two-part survey offers...
Article
Full-text available
Vital lifelines in the event of a disaster, transportation networks support evacuation activities, emergency logistics, and the restoration of daily activities. The rapid recovery of surviving transportation network operations immediately after a disaster is critical for the well-being of communities. The focus here is on planning highway operation...