Takanori Sakai

Takanori Sakai
Tokyo University of Marine Science and Technology · Department of Logistics and Information Engineering

Associate Professor

About

34
Publications
9,869
Reads
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334
Citations
Citations since 2016
30 Research Items
334 Citations
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2016201720182019202020212022020406080
Introduction
Dr. Taknori Sakai is an Associate Professor in the Department of Logistics and Information Engineering, at the Faculty of Marine Technology, Tokyo University of Marine Science and Technology (TUMSAT). Takanori's research interest lies in urban freight transportation and logistics. http://www2.kaiyodai.ac.jp/~tsakai2/people.html

Publications

Publications (34)
Article
The maturation of digital(ized) consumption, together with the amplification of cities’ initiatives in response to local and global environmental challenges, has placed goods transport, an essential but impactful activity, at the forefront of urban stakeholders’ scrutiny. High-performance and low-impact supply chains benefit from the presence of lo...
Article
Full-text available
The e-commerce market has grown rapidly in the past two decades. The need for predicting e-commerce demand and evaluating relevant policies and solutions is increasing. However, the existing simulation models for e-commerce demand are still limited and do not consider the impacts of delivery options and their attributes that shoppers face on multip...
Article
With rapid ongoing urbanization, cities across the world face a multitude of challenges in urban logistics. Delivery of goods to retail districts is particularly challenging as these places are typically located in congested urban centers. In response, policy makers have explored various freight management initiatives, including urban consolidation...
Article
Calibration is an essential process in making an agent-based simulator operational. In particular, the calibration for freight demand is challenging because of the model complexity and the shortage of available freight demand data compared with passenger data. This paper proposes a novel calibration method that relies solely on screenline counts, n...
Article
With increased internet connectivity, there are more opportunities to substitute physical, or “in-person”, activities with online activities. With this, changes to household and individual travel/activity patterns are to be expected. For example, the increased adoption of e-commerce can affect individual travel destinations and frequency. To study...
Article
A growing body of research looks specifically at freight vehicle parking choices for purposes of deliveries to street retail, and choice impacts on travel time/uncertainty, congestion, and emissions. However, little attention was given to large urban freight traffic generators, e.g., shopping malls and commercial buildings with offices and retail....
Article
The use of on-demand ride services has continued to grow rapidly in recent years. At some point, given current technologies of automation, it is plausible that these rides will be driverless, termed automated mobility-on-demand (AMoD). This research examines how eager people are to adopt AMoD ride services and whether they will change their travel...
Article
Full-text available
Time-sensitive parcel deliveries—shipments requested for delivery in a day or less—are an increasingly important aspect of urban logistics. It is challenging to deal with these deliveries from a carrier perspective. These require additional planning constraints, preventing the efficient consolidation of deliveries that is possible when demand is we...
Preprint
Full-text available
Calibration is an essential process to make an agent-based simulator operational. Especially, the calibration for freight demand is challenging due to the model complexity and the shortage of available freight demand data compared with passenger data. This paper proposes a novel calibration method that relies solely on screenline counts, named Scre...
Article
Full-text available
The rapid growth in online shopping and associated parcel deliveries prompts investigation of the factors that contribute to parcel delivery demand. In this study, we evaluated the influence of locational and household characteristics on e-commerce home delivery demand. While past research has largely focused on the impacts of the adoption of onlin...
Chapter
Full-text available
Advancements in information and communication technologies (ICT) and the advent of novel mobility solutions have brought about drastic changes in the urban mobility environment. Pervasive ICT devices acquire new sources of data that can inform detailed transportation simulation models, and are useful in analyzing new policies and technologies. In t...
Article
Advances in urban freight modeling and the availability of freight vehicle operations data have enabled the use of disaggregate models to evaluate urban delivery policies and solutions. This research assesses different model specifications for urban freight simulation and their influence on flow reproducibility, with a focus on trip- and tour-based...
Preprint
Full-text available
The e-commerce delivery demand has grown rapidly in the past two decades and such trend has accelerated tremendously due to the ongoing coronavirus pandemic. Given the situation, the need for predicting e-commerce delivery demand and evaluating relevant logistics solutions is increasing. However, the existing simulation models for e-commerce delive...
Preprint
Time-sensitive parcel deliveries, shipments requested for delivery in a day or less, are an increasingly important research subject. It is challenging to deal with these deliveries from a carrier perspective since it entails additional planning constraints, preventing an efficient consolidation of deliveries which is possible when demand is well kn...
Article
Full-text available
Despite significant advances in freight transport modeling in recent years, there is still lack of available tools for evaluating novel logistics solutions. We introduce the framework of SimMobility Freight, which is part of SimMobility, a multi-scale agent-based urban transportation simulation platform. SimMobility Freight is capable of simulating...
Article
Full-text available
Existing studies of urban logistics facility locations and their impacts on negative externality tend to focus on the movements of freight that start and end within a metropolitan area and overlook the role of the shipments with origin or destination outside of the urban area – external shipments – in characterizing logistics facilities. This resea...
Article
Full-text available
While many past studies analyze the changes in the spatial distribution of logistics facilities and provide insights on the factors that drive the migration of logistics facilities, only a few studies analyze the factors of location choice at the individual facility level. Furthermore, the differences among various facility types, with respect to t...
Article
Full-text available
Modeling shipment size for intra-city shipments is a subject that has not been sufficiently addressed in past research, despite its growing importance in disaggregate freight modeling. While past research on shipment size estimation mainly focuses on inter-city shipments, intra-city shipments differ from them in various aspects. In filling this res...
Article
Full-text available
Freight forecasting models have been significantly improved in recent years, especially in the field of goods vehicle behavior modeling. On the other hand, the improvements to commodity flow modeling, which provide inputs for goods vehicle simulations, were limited. Contributing to this component in urban freight modeling systems, we propose an err...
Article
Full-text available
Urban freight transport is primarily fulfilled by commercial road vehicles. Within cities, overnight parking is a critical element influencing commercial vehicle operations, particularly for heavy vehicles with limited parking options. Providing adequate overnight parking spaces for commercial vehicles tends to be a challenge for urban planners. In...
Conference Paper
Full-text available
Shipment size modeling for intra-city shipments is one of the subjects which have not been sufficiently addressed in past research, despite its growing importance on disaggregate freight modeling. While the past research on shipment size estimation mainly focuses on inter-city shipments, intra-city shipments are different from the inter-city shipme...
Article
Full-text available
Freight vehicle tours and tour-chains are essential elements of state-the-art agent-based urban freight simulations as well as key units to analyse freight vehicle demand. GPS traces are typically used to extract vehicle tours and tour-chains and became available in a large scale to, for example, fleet management firms. While methods to process thi...
Preprint
Full-text available
Despite the growing research interests on the spatial restructuring of logistics facilities that occurred in many cities around the world, the relationship between the spatial pattern of logistics land use and the level of externalities is far from being elucidated. We use the Urban Logistics Land-use and Traffic Simulator (ULLTRA-SIM), developed f...
Article
Full-text available
We analyze the relationship between the location of logistics facilities and the goods vehicle travel distances for the shipments associated with the facilities, using data from a large urban freight survey conducted in the Tokyo Metropolitan Area in 2013. Our analysis categorizes the logistics facilities into groups based on the type of commodity...
Article
Full-text available
The concept of “freight landscape,” the basis for a modeling approach for urban freight traffic estimation using commonly available datasets, was proposed in 2017 with a case study applying it to the Los Angeles metropolitan area. To extend the scope of that research, we conduct another case study using data from the Paris region, France. We estima...
Conference Paper
Full-text available
The concept of “Freight Landscape” the basis for a modeling approach for urban freight traffic estimation using commonly available datasets, was proposed by Giuliano et al., 2015, applying it to the Los Angeles metropolitan area. To extend the scope of their research, we conduct another case study, using data from the Paris region, France. We estim...
Article
Full-text available
We use the comprehensive freight survey data from 2003 and 2013 to analyze how the restructuring of logistics industry that occurred amid the broad trend of decentralization in the Tokyo Metropolitan Area has affected the efficiency of truck shipments. The analysis reveals that the negative effects of the outward migration of logistics facilities w...
Article
Full-text available
In existing freight models, the choice of locations for logistics facilities and the choice of logistics facilities for routing the shipments are often treated without distinction, although these two decisions are separate and affected by different factors. In this paper, models for choosing a logistics facility are developed that match truck trip...
Article
Full-text available
We use the large-scale freight survey data to examine the historical transition of the logistics facility distribution in the Tokyo Metropolitan Area (TMA) and investigate the possible causal factors for the changes. The analysis revealed the decentralization of logistics facilities during the period 1980-2003 and suggested that the asset price bub...
Conference Paper
Full-text available
In this paper, we develop location choice models for logistics facilities, applying the framework of the discrete choice model. We use the models to test land-use policies that are designed to decrease overall truck travel. The data from the 5th Tokyo Metropolitan Freight Survey, a large comprehensive urban freight survey conducted during 2013-2014...
Article
Full-text available
There has been a noticeable development of logistics facilities along the newly constructed circumferential expressway in the Tokyo Metropolitan Area, suggesting a strong association between the access provided by the roadway system and the locations of logistics facilities. As such, the development of analytical tools that can capture the complex...
Article
Full-text available
This study uses data from a large-scale freight survey conducted in the Tokyo Metropolitan Area to jointly analyze the spatial distribution of logistics facilities and their proximities to the locations of shipment origins and destinations. The aim of the study is to examine in detail the argument that logistics sprawls increase truck trip distance...
Conference Paper
Full-text available
In this paper, we analyze data from a large-scale survey, the 2003 Tokyo Metropolitan Freight Survey (TMFS), to examine some of the sampling issues associated with urban freight surveys. The TMFS data indicate that the variables commonly obtained from freight surveys, such as tons shipped and truck trips generated at a facility level, have highly s...

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Projects

Projects (2)
Project
The trend, characteristics, and impacts of logistics facilities in metropolitan regions.
Project
An agent-based urban simulation platform