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Introduction
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July 2002 - October 2006
November 2010 - present
October 2006 - September 2010
Publications
Publications (55)
Purpose
Businesses produce corporate sustainability information in support of the decision-making of their stakeholders through sustainability reporting. However, the use of such information has been limited because of the broadness of sustainability indicators used in sustainability reports. This study aims to identify sector-specific sustainabili...
It is important to evaluate the quality of service (QoS) of bus rapid transit (BRT) station platform operation. Passenger-specific area (PSA) is used as a QoS measure which is determined by considering passenger activities separately. As passengers perform various activities on the same platform space, there is a need to evaluate BRT platform QoS b...
Purpose – Hot and humid climates (HHCs) are potential environmental hazards that directly affect construction workers’ health and safety (HS) and negatively impact workers’ productivity. Extensive research efforts have addressed the effects of HHCs. However, these efforts have been inconsistent in their approach to selecting factors influencing wor...
Railway level crossing closures can disrupt traffic flow significantly, especially in peak hours. The current increases in road and rail traffic worsen the situation and can result in congestion known to significantly increase road users’ travel times. In this study, seven of the most problematic level crossings around Brisbane, Australia, were sur...
This chapter sought to answer the questions: Why is there a reluctance to share a common data environment and to collaborate in bringing together data that can be analysed and used for the efficient operation of the facility? What are the inhibitors to the wide-ranging collection of data and its use as information in the construction industry? What...
The passenger specific area (PSA) on a Bus Rapid Transit (BRT) station platform is a key measure of operational performance. In the current literature, transit station platform operation is generally evaluated using PSA by considering passenger activities separately. The aim of this study is to combine platform characteristics and various passenger...
The real-time video detection model is yet a challenging, especially in detecting construction site workers and their PPE (helmet and safety gear) and postures, since the construction site environment consists multiple complications such as different illumination levels, shadows, complex activities, a wide range of personal protective equipment (PP...
Purpose
The purpose of this paper shows the effect of hot and humid weather conditions (HHWCs) on workers that has resulted in considerable loss in the construction industry, especially during the hottest periods due to decline in worker productivity (WP). Until the last few decades, there is very limited research on construction WP in HHWCs. Never...
Harsh Weather Conditions (HWC) are environmental hazards that directly affect construction worker's health and safety, with a corresponding negative impact on their productivity. Climate predictions predict worsening scenarios of hot and humid weather conditions extending into regions not previously subject to HWC. The predictions pose a significan...
Harsh Weather Conditions (HWC) are environmental hazards that directly affect construction worker’s health and safety, with a corresponding negative impact on their productivity. Climate predictions predict worsening scenarios of hot and humid weather conditions extending into regions not previously subject to HWC. The predictions pose a significan...
Harsh Weather Conditions (HWC) are environmental hazards that directly affect construction worker’s health and safety, with a corresponding negative impact on their productivity. Climate predictions predict worsening scenarios of hot and humid weather conditions extending into regions not previously subject to HWC. The predictions pose a significan...
Efficient and reliable tools that help us to manage and plan our daily activities are an essential part of our busy life. Trip planner is one of the tools that not only helps to plan an unfamiliar journey but also is important for reliable planning of the dynamic daily travel. Numerous trip planners from bike apps to sophisticated airline based int...
Monitoring pedestrian and cyclists movement is an important area of research in transport, crowd safety, urban design and human behaviour assessment areas. Media Access Control (MAC) address data has been recently used as potential information for extracting features from people's movement. MAC addresses are unique identifiers of WiFi and Bluetooth...
Travel time has been identified as an important variable to evaluate the performance of transportation systems. The knowledge of travel time reduces the uncertainty in decision-making about departure time and route to be taken. In order to utilise adequately the advanced travel time data collection methods in use today, this paper introduces a nove...
In recent years rapid advances in information technology have led to various data collection systems which are enriching the sources of empirical data for use in transport systems. Currently, traffic data are collected through various sensors including loop detectors, probe vehicles, cell-phones, Bluetooth, video cameras, remote sensing and public...
In recent years rapid advances in information technology have led to various data collection systems which are enriching the sources of empirical data for use in transport systems. Currently, traffic data are collected through various sensors including loop detectors, probe vehicles, cell-phones, Bluetooth, video cameras, remote sensing and public...
One of the concerns about the use of Bluetooth MAC Scanner (BMS) data, especially from urban arterial, is the bias in the travel time estimates from multiple Bluetooth devices being transported by a vehicle. For instance, if a bus is transporting 20 passengers with Bluetooth equipped mobile phones, then the discovery of these mobile phones by BMS w...
Traffic state estimation in an urban road network remains a challenge for traffic models and the question of how such a network performs remains a difficult one to answer for traffic operators. Lack of detailed traffic information has long restricted research in this area. The introduction of Bluetooth into the automotive world presented an alterna...
The article introduces a novel platform for conducting controlled and risk-free driving and traveling behavior studies, called Cyber-Physical System Simulator (CPSS). The key features of CPSS are: (1) simulation of multiuser immersive driving in a three-dimensional (3D) virtual environment; (2) integration of traffic and communication simulators wi...
Crashes that occur on motorways contribute to a significant proportion (40-50%) of non-recurrent motorway congestions. Hence, reducing the frequency of crashes assist in addressing congestion issues. Analysing traffic conditions and discovering risky traffic trends and patterns are essential basics in crash likelihood estimations studies and still...
The application of the Bluetooth (BT) technology to transportation has been enabling researchers to make accurate travel time observations, in freeway and arterial roads. The Bluetooth traffic data are generally incomplete, for they only relate to those vehicles that are equipped with Bluetooth devices, and that are detected by the Bluetooth sensor...
We present a new framework for conducting controlled driving behavior studies based on multiuser networked 3-D virtual environments. The framework supports: 1) the simulation of multiuser immersive driving; 2) the visualization of surrounding traffic; 3) the specification and creation of reproducible traffic scenarios; and 4) the collection of mean...
The study of macroscopic traffic features, such as flow, speed and travel time is essential to the understanding of the freeway and arterial road traffic. However, modeling the temporal evolution of these features and the relationship between them is difficult, especially for arterial roads, where the process of traffic change is driven by a variet...
KEEP CLEAR pavement markings are widely used at urban signalised intersections to indicate to drivers to avoid entering blocked intersections. For example, 'Box junctions' are most widely used in the United Kingdom and other European countries. However, in Australia, KEEP CLEAR markings are mostly used to improve access from side roads onto a main...
Crashes that occur on motorways contribute to a significant proportion (40-50%) of non-recurrent motorway congestions. Hence, reducing the frequency of crashes assists in addressing congestion issues (Meyer, 2008). Crash likelihood estimation studies commonly focus on traffic conditions in a short time window around the time of a crash while longer...
Cooperative ITS is enabling vehicles to communicate with the infrastructure and each other, to provide improvements in traffic safety, traffic control, and traffic management. Researchers from fields of information technology, communication, and traffic engineering are involved in the development of applications to achieve these goals. One challeng...
For the evaluation, design, and planning of traffic facilities and
measures, traffic simulation packages are the de facto tools for
consultants, policy makers, and researchers. However, the available
commercial simulation packages do not always offer the desired work
flow and flexibility for academic research. In many cases, researchers
resort to d...
Accurate, detailed and up-to-date road information is of special importance in geo-spatial databases as it is used in a variety of applications such as vehicle navigation, traffic management and advanced driver assistance systems (ADAS). The commercial road maps utilized for road navigation or the geographical information system (GIS) today are bas...
In microscopic traffic simulators, the interaction between vehicles is considered. The dynamics of the system then becomes an emergent property of the interaction between its components. Such interactions include lane- changing, car-following behaviours and intersection management. Although, in some cases, such simulators produce realistic predicti...
This paper presents a new methodology for optimiz- ing the signal timing controls of oversaturated networks based on the cell transmission model and a goal programming tech- nique with multiple objectives. The proposed model accounts for intersection spillovers, equity in delays, and system throughputs. This new formulation is solved by genetic alg...
Though urban transport data collection is not a new initiative in China, China Urban Transport Database (CUTD) is an integrated database, which supports central and local governments to make appropriate policies of sustainable transport development and to efficiently monitor effects of these policies. In this paper, we propose a CUTD framework whic...
Serious games became an important device for increasing the awareness of issues that are important to society. One such issue is the environmental impact of driving. To support the training and wide promotion of eco-friendly driving, an appropriate platform and tools are needed. In this paper, we present the Scenario Markup Language (SML), a simple...
we present the Scenario Markup Language (SML), a powerful language for authoring realistic traffic situations. This effort is part of a novel framework for automatically generating complex scenarios with static and dynamic elements. SML facilitates the scripting of behavioral driver studies in networked multi-user online three-dimensional (3D) virt...
We present the Scenario Framework that includes (1) the Scenario Markup Language (SML), a simple yet expressive language for authoring realistic traffic situations, and (2) capabilities for driver behavioral data collection. The framework facilitates large scale driver behavioral studies for data collection in multi-user online three-dimensional (3...
Intelligent Transport System (ITS) strategies can significantly reduce CO<sub>2</sub> emissions of vehicles. Since the impact of ITS measures is highly dependent on driver acceptance and compliance rates, it is important to study the response of human drivers to new ITS strategies (the “human factor”). However, there is currently no low-cost yet ef...
In recent years, the use of computer-based simulations in the transportation domain has become increasingly important to analyze and test measures for Intelligent Transport System (ITS) policies. Simulators were built to address several aspects of transport, including traffic, driving experience, and pedestrian behavior. However, as the majority of...
Traffic Simulation models tend to have their own data input and output formats. In an effort to standardise the input for traffic simulations, we introduce in this paper a set of data marts that aim to serve as a common interface between the necessaary data, stored in dedicated databases, and the swoftware packages, that require the input in a cert...
抄録
本研究では,首都高速道路におけるETC-ODデータを用いて短期的な将来のOD交通量を予測する方法の提案を行う.具体的には,蓄積されたETC-ODデータをベイジアンネットワークにより学習し,確率的に短期的な将来OD交通量を予測するものである.構築したモデルを用いて,まず,その予測値の出力方法の違いと予測対象時間の違いによる予測精度の違いを考察した.次に,ODペアが持つOD交通量の変動特性の違いと予測精度の違いについて検証し,OD交通量の変動が大きいODペアでは時間帯別平均OD交通量よりも提案したモデルの方が予測精度を改善できることが分かった.また,ODペア間の交通状況として旅行時間情報をOD予測モデルに加味することで,予測精度が更に改善されることが明らかとなった.
Sustainable management of data driven projects is vital for the efficiency and success of a project, as well as for the task of knowledge management for the institution or consortium that is working on the project. With partners often being located in separate locations, data is kept redundant, exists in different versions and access is sometimes d...
Simulation is a strong tool for traffic engineers to investigate phenomena, to test control strategies and their impacts, but it also has its limitations. The data needed to calibrate the simulation is limited, mostly from low quality, or - when looking into behavior - not available at all. For the latter on, methods ranging from simple surveys to...
Virtual worlds are a good platform to perform driving behavior experiments among a big group of people at low cost and high level of realism. Since driving behavior is highly influenced by the behavior of surrounding vehicles it is crucial to establish a realistic environment for the driving experiment. Thus, the avatars' vehicle needs to be recogn...
Traffic engineers are involved in transport modeling, traffic simulation, operation optimization, and the development of methods
to control and analyze traffic itself. New developments of individual traffic, public transport as well as pedestrian movements
are the hope to ensure mobility and accessibility in urban areas to secure mobility in the le...
Gathering real life data, for whatever type of use, is a time consuming job. A lot of data is measured and stored in several
places and different formats around the world. While a lot of it is not used, other institutions gather similar data on different
locations or, worse, on the same ones. In this way, a lot of money and time is spent unnecessar...
This paper present OD traffic volume variation using ETC-OD data measured on Tokyo Metropolitan Expressway. The independency of OD volume is tested by chi-square test assuming OD volume follows Poisson distribution. From the results of test, independency of OD volume has different tendency by day of week and time of the day. The characteristics of...
In this paper we are introducing a self learning tool for travel time estimation in signalized urban networks based on probe data. The main feature of this tool is, that it can be applied with a basic network description instead of a detailed modeling of the network structure. We show how probe data can be utilized to train a Bayesian network to fo...
For transportation studies and applications, practitioners as like as researchers spend an enormous amount of time to gather suitable data and to convert this data into a format that can be processed by their working tools or developed models. This work slows down their job and leads to tons of unused data in archives that is inaccessible for other...
In this paper we introduce the use of microscopic measurement data to calibrate driving behavior in microscopic simulation models. Based on data gathered from remote sensing and equipped vehicle data, a dynamic decision network has been designed to determine drivers' action to certain situations. Since this kind of pattern matching leads to a deter...
Online microscopic simulation is very sensitive to the driving behavior of the individual vehicle-driver combination. Therefore, a virtual driver module has been developed, which includes a route choice model to assign traffic flows between the origin and destination under real-time conditions. The route choice model presented in this paper assigns...
Travel time is one of the most understandable parameters to describe traffic condition and an important input to many intelligent transportation systems applications. Direct measurement from Electronic Toll Collection (ETC) system is promising but the data arrives too late, only after the vehicles complete their trip. There are several existing mod...
In this paper we are introducing a self learning tool for travel time estimation in signalized urban networks based on probe data. The main feature of this tool is, that it can be applied with a basic network description instead of a detailed modeling of the network structure. We show how probe data can be utilized to train a Bayesian network to fo...
To cope with the demand for mobility, which will further increase in the future, the infrastructure has to be used more efficiently. Therefore network operation control is needed to interfere with the traffic. The basis of operational control should be an accurate online estimation of the actual traffic situation and a prediction of the future. The...
Traffic models are used to support traffic engineers with the optimisation task by predicting the effects of ITS measures before applying them to the real network. Simulation of traffic networks require a whole suite of applications, from data gathering, cleaning and fusion, over origin/destination (OD) estimation and prediction, to the simulation...
The thesis deals with the design and implementation of a distributed framework for real-time traffic management using microscopic online simulation.