Papers by Dorinela Costescu
Challenges in the Development of Urban Intermodal Mobility Systems
Practice, progress, and proficiency in sustainability, Feb 10, 2023
Journal of Engineering Sciences and Innovation
The paper aims to demonstrate the inseparable interconnections between "social mobility", "intell... more The paper aims to demonstrate the inseparable interconnections between "social mobility", "intellectual mobility" and "spatial mobility" (residential and traffic/trips). The broad themes of mobility reveal the unity that emerges from the ontological, sociological, and epistemic connections among various disciplines belonging to the human, natural and applied sciences. This unity of the disciplines involved in the study of mobility leads to interdisciplinarity. Three types of interdisciplinarity are identified and exemplified. The functions of interdisciplinarity result from the multiple structures involved in mobility research. To meet these functions, the contributions of the disciplines from several fields are decisive. But, disciplinary analysis, as a straightforward technique, monotonous and strictly specialized research tends to isolate experts in groups. Therefore, a further interdisciplinary approach is required to reach the finality of theoretical and applied research. Consequently, the path that research has been taken and will repeatedly continue starts from disciplinary research towards interdisciplinary research, and returns to disciplines, for improvement.
Performance of Urban Public Transportation Networks
IGI Global eBooks, Feb 10, 2023
AppliedMath
Queue systems are essential in the modelling of transport systems. Increasing requirements from t... more Queue systems are essential in the modelling of transport systems. Increasing requirements from the beneficiaries of logistic services have led to a broadening of offerings. Consequently, models need to consider transport entities with priorities being assigned in relation to the costs corresponding to different classes of customers and/or processes. Waiting lines and queue disciplines substantially affect queue system performance. This paper aims to identify a solution for decreasing the waiting time, the total time in the system, and, overall, the cost linked to queueing delays. The influence of queue discipline on the waiting time and the total time in the system is analysed for several cases: (i) service for priority classes at the same rate of service with and without interruptions, and (ii) service for several priority classes with different service rates. The presented analysis is appropriate for increasing the performance of services dedicated to freight for two priority cla...
This paper presents some aspects related to the capacity assessment of design elements for metro ... more This paper presents some aspects related to the capacity assessment of design elements for metro stations, and focuses on the evaluation of escalator capacity, as long as it is considered both a restrictive element of total transfer capacity, and a qualitative element of the provided transport service. The paper takes into consideration a practical method for the estimation of the escalator capacity, which is mainly based on the user behaviour in occupancy of the escalator space. We use then this method to verify the provided capacity escalators in two main stations of the Bucharest metro and we reveal some needed actions in metro station design.
Logistic collaboration through mutualization of individual resources in multi-actor supply chains... more Logistic collaboration through mutualization of individual resources in multi-actor supply chains represents a method applied in order to reduce overall transport cost and CO 2 emissions. With the aim of highlighting the advantages of this method, the paper presents a collaborative centres location-allocation model that allows quantifying the effects of the resources mutualization. The developed model is exemplified for the national distribution of general palletized goods supplied by several companies. The overall transport cost and CO 2 emission are used as measures in comparative analysis of the current situation and different proposed scenarios for resources mutualisation in logistic schemes with flow consolidation in collaborative centres.
Due to social costs of road accidents, traffic safety has to represent a main concern in urban pl... more Due to social costs of road accidents, traffic safety has to represent a main concern in urban planning policies. The need of tools to assess proposed measure to traffic risk reducing has been emphasized in delineating of European road safety strategy in the last decade. In this frame, the paper presents a study on Accident Prediction Functions (APFs) for road intersections in urban areas. APFs are used to identify factors that are associated to the risk of road accident occurrence and, afterward, as tool in traffic risk assessment for different urban planning scenarios. In this paper, the APFs for intersections are defined and calibrated based on available data on severe road accident recorded in Bucharest for the years 2008 to 2012.
IOP Conference Series: Materials Science and Engineering, 2018
The storage areas from maritime container terminals have the role to allow the transfer of contai... more The storage areas from maritime container terminals have the role to allow the transfer of containers from maritime ships to inland transport and vice versa or from a maritime ship to another. The number of slots in storage area must be higher enough to not restrict the activity in terminal. In the case of containers loaded with dangerous goods, specifically rules must be applied in accordance with international maritime laws. Applying the security policies will enforce special conditions for storage of containers along with other containers or in a dedicated area for containers loaded with dangerous goods. All these measures lead to a limitation of the storage capacity inside the terminal. In the paper, the authors studying the influence of storage area design, in accordance with handling and storage restrictions of containers loaded with dangerous goods, on container terminal capacity. Taking into consideration the multi-flows interaction and the non-uniform arrivals of vessels and inland vehicles, discrete event simulation stands as a feasible technique for investigate terminal capacity for different organizational schemes of the storage area. The activities conducted inside of container terminal are represented using a logical model and implemented in ARENA software. A simulation model is developed and used to evaluate the variation of terminal activity's parameters. A set of input scenarios are developed to analyse and identify how to organize the activity in the terminal, namely how to segregate the containers within the storage area. The estimation of the general parameters of activity performance obtained through computer simulation helps the container terminal administration to choose an optimal use of storage area.
IOP Conference Series: Materials Science and Engineering, 2018
International sea-freight container transportation has grown dramatically over the last years and... more International sea-freight container transportation has grown dramatically over the last years and container terminals represent nowadays a key actor in the global shipping network. The management of a container terminal is a complex process that involves many decisions. Among the problems to be solved, there are the spatial allocation of containers on the terminal yard, allocation of ships to berths and cranes, scheduling priorities and operations in order to minimize ship's turnaround time, one of the main indicators of the terminal performance for the shipping companies. An efficient use of quay cranes is crucial, since quay cranes are highly expensive and represent one of the most scarce resources in the terminal. The quay crane allocation problem aims to efficiently assign quay cranes to vessels that must be operated over a given time horizon. The allocated cranes must be sufficient to complete the workload within the given time window, although many configurations are possible. In this paper, we will mainly focus on the quay crane scheduling problem, considering other logistic activities as given. This problem can be split into two sub-problems. First, specific quay cranes must be assigned to specific tasks. Second, a detailed schedule of the loading and unloading moves for each quay crane should be constructed. In this case, the number of quay cranes assigned to the vessel is assumed to be known in advance. The paper presents a solution for solving the quay crane scheduling and allocation problem that is based on working with modern optimization techniques such as genetic algorithms. The genetic algorithms are soft computing techniques that are used for optimization and search. Thus, the solution is obtained through a C++ built on simulation model that, over the analytical modelling of container`s terminals activity, has the main advantage of providing a greater level of detail and avoids too many simplifications. Also, three different scenarios that describe operational situations have been taken into account.
A practical approach to solving the „just in time” periodic transportation problem
Acknowledgement of reviewers
Natural Hazards, 2017
Francesca Abastante Azhar Abbas Husain Abbas Sattar Ahmed Abdel Maysam Abedi Aminuddin Ab Ghani M... more Francesca Abastante Azhar Abbas Husain Abbas Sattar Ahmed Abdel Maysam Abedi Aminuddin Ab Ghani Muhammad Abid Mark Ablowitz Ahmad Abo-El-Ezz David Adamson Jane Addison Salah El Adlouni Philip Kofi Adom Ernest Agee Amir AghaKouchak Raed Ahmad Sajjad Ahmad Bayes Ahmed Ferdous Ahmed M.A. Ahmed Nesar Ahmed Z.Y. Ai Brett Aimers Abolghasem Akbari Mitsuyoshi Akiyama Amir H. Alavi Raffaele Albano Jean Albergel José Albuquerque Filho Dimitris Alexakis David Alexander Gavris Alexandru Emad Al-Heety Carolina Aliano Reza Alipoor Morad Alizadeh Penny Allan George Allen Simon Allen Luis Pedro Almeida Corrado Altomare Ahmet Can Altunisik Seraphim Alvanides Fátima Alves Burul Alymkulova Giuseppina Amato Clifford Amoako Matias Ana Pablo Iribarren Anacona R. Anbalagan P. Anbazhagan Milena Andrade Emmanouil Andreadakis Edward J. Anthony Muhuddin Rajin Anwar George Arampatzis Moacyr Araujo Diego Arcas Ali Ardalan Luminita Ardeleanu Christina Argyrou Sotiris Argyroudis Edier Aristizabal Iuliana Armas Jorge Arnedo Arne Arns Diego Arosio Felipe Aros-Vera Jagannath Aryal
Romanian Journal of Transport Infrastructure
The public transport system has an essential role in the sustainability of the urban environment.... more The public transport system has an essential role in the sustainability of the urban environment. The accessibility is one of the critical functions for the increase of public transport efficiency. In this framework, the paper presents a methodology to enhance the accessibility of the public transport network. The methodology aims to design a network of dedicated bus lanes to operate in areas with low accessibility and improve the connections to metro and tram lines that provide rapid and high-capacity services.
City Logistics with Collaborative Centers
City Logistics 1, 2018
Transport activities are among the greatest contributors to greenhouse gas (GHG) emissions and de... more Transport activities are among the greatest contributors to greenhouse gas (GHG) emissions and despite other economic sectors the trend is still positive. Using the latest European Environment Agency guidelines in estimating vehicles emissions, the paper presents a methodology for assessing GHG emissions integrating exhaust emission factors, geographic information system (GIS) data, traffic composition surveys, and road traffic simulation. According to EU recommendation for reporting national gas inventories, the estimation of GHG emission factors based on the average speed is adopted. The computer simulation of road traffic allows for tracing individual car driving cycles and computing emissions based on average speed, mileage, fuel, and engine emission standards. The main advantage when using the computer traffic simulation is to reduce the amount of measurements which have to be performed in the field. Also the computer models have the ability to evaluate the effects of different...
The recent road safety studies demonstrate that the risk associated with urban road traffic must ... more The recent road safety studies demonstrate that the risk associated with urban road traffic must represent an additional criterion in selection of the best planning alternatives. The settled goal is the a-priori minimization of road accidents number for each studied alternative of urban planning. Therefore supplementary research is necessary to develop models and tools to estimate traffic risk for different scenarios of urban areas development and traffic pattern. The paper presents the model developed with geographic information system (GIS) facilities for estimate of risk associated with urban road traffic in Bucharest. The digital model of the Bucharest city area is used to locate and analyze the road accidents and to identify the road infrastructures features and urban areas with traffic risk. Key-Words: road traffic risk, road traffic safety, safety performance functions, geographic information system
Effects of Facility Location on Urban Road Traffic
The aim of the paper is to determine the effects of locating a new commercial/logistic facility o... more The aim of the paper is to determine the effects of locating a new commercial/logistic facility on urban traffic. The location decision together with the one of goods’ supply/distribution support the general framework of taking transport decisions: whether to realise the transport or not, and choosing the destination, mode, time and frequency of the transport to be realised. The necessity of locating and/or relocating different facilities must foresee the transport flows that they would generate and that would eventually become traffic flows on an already congested urban network. The paper also tries to establish a best practices example in the field of intersection design and traffic management for further developments of new logistic activities. Considering the actual O-D matrix with traffic flows measured on the field the authors determine a solution for creating access to a new commercial/logistic centre without creating congestion or important irregularities on a major route of...
АНАЛИЗ НА ГРАДСКИ РЕГИОНИ, ПРИ КОИТО СЕ НАБЛЮДАВАТ НИСКИ НИВА НА ПЪТНА БЕЗОПАСНОСТ
АНАЛИЗ НА ГРАДСКИ РЕГИОНИ, ПРИ КОИТО СЕ НАБЛЮДАВАТ НИСКИ НИВА НА ПЪТНА БЕЗОПАСНОСТ
Summary. In this paper we discuss several consequences of the freight transnational rail liner se... more Summary. In this paper we discuss several consequences of the freight transnational rail liner service on the rail corridor capacity. The Northern part of the IVth TEN-T corridor on Romanian territory has specific feature related to the passenger flows connecting important Romanian demographic and economic clusters, on one side, and on the other side, to its diagonal crossing aspect, from the Western border to the Constanta port, connecting the Central Europe countries to the Black Sea regions, which means that there are a lot of expectation in terms of this corridor rail capacity: this corridor will, be for a long time further, the single and first completed continuous upgraded and modernised rail corridor. Its utilization will necessarily be heterogeneously planned (meaning for passengers rapid trains and freight rapid trains, from domestic/internal market, but especially for external market of Romania). In this paper, we consider a simple mathematical model for the calculus of ca...
The impact of traffic safety is rarely included in urban planning, though the social cost of road... more The impact of traffic safety is rarely included in urban planning, though the social cost of road accident is overall evaluated being very high. The recently road safety research concludes that road safety has to represents an additional criterion in selection of the best urban planning alternative. Therefore a prediction of intrinsic road safety is necessary for each urban road network configuration. An initial phase in achieving this goal consists in identifying typologies of low safety features of urban road network and relationships between functionalities of urban areas and traffic safety. The paper presents a GIS model developed to analyze the urban areas with low safety performances and to obtain the datasets necessary in definition and calibration of safety performances functions.
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Papers by Dorinela Costescu