Oriental Consultants Company Ltd

Tokyo, Japan

Oriental Consultants Company Ltd

Tokyo, Japan
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Izumi C.,Oriental Consultants Ltd | Akutagawa S.,Kobe University | Tyagi J.,Delhi Metro Rail Corporation. | Abe R.,Oriental Consultants Ltd | Ravi Sekhar C.,CSIR - Central Electrochemical Research Institute
Tunnelling and Underground Space Technology | Year: 2014

Despite of the advancement of monitoring devices at construction sites and the rapid progress of data management and IT, accidents in construction are still threatening not only site workers but also the public. It is difficult to cover all the dangerous areas on a construction site with expensive devices. To overcome these problems, a new monitoring method, called On Site Visualization (OSV, for short), has been developed. Unlike a conventional method of data acquisition, the use of light emitting sensors to execute monitoring by OSV enables real-time data processing and visualization on-site, so that the state of deformation, strain, inclination and etc. of concern is grasped with no delay in time and is shown visually to anyone nearby. Rational use of the new scheme based on the OSV offers a new stage whereby visually shared real-time information about the structures of concern could lead to a new paradigm of field measurement and a safer working environment. This paper describes the application example of the OSV monitoring system in the open cut excavation site of Delhi Metro in New Delhi, India. In the evaluation of the project, the role and effectiveness of OSV as a part of safety management were confirmed through a questionnaire survey given to the workers and public citizens. © 2014 Elsevier Ltd.

Lorentzen T.,FORUM8 Co.Ltd | Ito Y.,FORUM8 Co.Ltd | Tazawa S.,Metropolitan Expressway Co. | Goto H.,Oriental Consultants Company Ltd
Advances in Transportation Studies | Year: 2011

This paper describes the components of a virtual reality (VR) driving simulation system and its application to the design of a tunneled highway junction in Tokyo, Japan. The simulator allows for road and transport plans to be experienced from a driver's perspective in a real-time 3D environment. User behavior information extracted from the virtual driving scenarios is used to assist design. Here we will consider the effectiveness of the VR tool for the safety assessment and design of signage and road markings for the Ohashi Junction project.

Awaji D.,Public Work Research Institute | Awaji D.,Shimizu Corporation | Isago N.,Public Work Research Institute | Kusaka A.,Public Work Research Institute | And 2 more authors.
ITA-AITES World Tunnel Congress 2016, WTC 2016 | Year: 2016

The immediate ring closure method, in which the entire periphery of the excavation area is closed immediately with an initial support within a short distance from the excavation face, has been increasingly used in Japan, especially, as one of the most effective countermeasures against difficult ground conditions in conventional tunneling. For reasonable design of this method, the performance requirements for the initial support should be clearly stated. The analysis of construction data of 30 road tunnels and the three-dimensional numerical modeling based on real data suggest that the immediate ring closure stabilizes the tunnel structure and the ground around it because of the inner pressure effect of the initial support, especially, for low ground competence factor and small internal friction angle. Finally, the bending compressive strength and the cross-sectional geometry of the initial support have to be considered in the tunnel design while considering the earth pressure and ground properties. Copyright © (2016) by the Society for Mining, Metallurgy and Exploration. All rights reserved.

Shimamoto H.,Kyoto University | Murayama N.,Oriental Consultants Company Ltd | Fujiwara A.,Hiroshima University | Zhang J.,Hiroshima University
Transportation | Year: 2010

This study evaluates an existing bus network from the perspectives of passengers, operators, and overall system efficiency using the output of a previously developed transportation network optimisation model. This model is formulated as a bi-level optimisation problem with a transit assignment model as the lower problem. The upper problem is also formulated as bi-level optimisation problem to minimise costs for both passengers and operators, making it possible to evaluate the effects of reducing operator cost against passenger cost. A case study based on demand data for Hiroshima City confirms that the current bus network is close to the Pareto front, if the total costs to both passengers and operators are adopted as objective functions. However, the sensitivity analysis with regard to the OD pattern fluctuation indicates that passenger and operator costs in the current network are not always close to the Pareto front. Finally, the results suggests that, regardless of OD pattern fluctuation, reducing operator costs will increase passenger cost and increase inequity in service levels among passengers. © 2010 Springer Science+Business Media, LLC.

Wachi T.,Oriental Consultants Company Ltd | Kawaguchi H.,Oriental Consultants Company Ltd | Kennedy T.,Glencairn Heights | Yagi S.,Chiyoda Corporation | Hagiwara T.,Oriental Consultants Company Ltd
Transportation Research Record | Year: 2011

Although the current business environment for railway transportation in the Central Java region of Indonesia is not promising, it is essential to revitalize the railway transport sector to support and sustain the social and economic needs and activities of the region. In the recent past, the wholly state-owned company, PT Kereta Api, was the only organization authorized for the operation and administration of railway services in Indonesia. To some extent because of this monopoly, the railway system currently confronts a variety of facility and operational problems caused by regulatory issues (or lack of regulation), such as an insufficient and unreliable subsidy system from the central government, poorly defined terms of shared responsibility between the government and the railway operator, and the absence of regulations for a new railway law. The new railway law allows for local government and private-sector participation in the railway industry. The regional railway regulatory scheme, which is composed of an infrastructure manager, a rail regulator, and a new railway operator, was formulated to take advantage of the opportunity provided under the new law. This regulatory scheme may encourage the private sector to participate in the railway business and stimulate the existing state-owned company through competition. From a case study of the Semarang-Solo-Yogyakarta freight railway, this paper presents an overall picture of how the regional railway system may materialize and how efficient railway operation could be achieved.

Yagi S.,Chiyoda Corporation | Nobel D.,Bandung Institute of Technology | Kawaguchi H.,Oriental Consultants Company Ltd
Transportation Research Record | Year: 2013

Following the analysis of household auto and motorcycle ownership and mode choice models presented in 2012, results are presented on joint mode and destination choice models developed on the basis of two large-scale travel surveys conducted 8 years apart. The models are compared, and implications of changes in the Jakarta, Indonesia, metropolitan area in the past decade are discussed. Interpretation of the effects of different types of variables, including basic travel, household and individual characteristics, and zonal attributes in the models estimated for 2002 and 2010, led to insights relative to changes in the transportation environment and an increase in the complexity of travel behavior in Jakarta. As long as the context of the society does not change, both models should remain unchanged with fixed parameters over a period of time. However, the models that were estimated on the basis of the surveys conducted nearly a decade apart indicated quite different parameters with different degrees of significance. As found in the comparison made in 2012, transferability of those disaggregate choice models may not always apply in urban areas of the developing world such as Jakarta, even though the model structure may remain the same. Such implications may also be worth studying for other urban areas of the developing world, although similarities may be restricted to regions that share modal and cultural norms.

Wakita Y.,Kinki University | Shiraishi H.,Oriental Consultants Company Ltd
Journal of Asian Architecture and Building Engineering | Year: 2010

This study had the aim of explaining the mechanisms of autonomous spatial recomposition of shophouses in Phnom Penh (Cambodia), along with understanding the current status of spatial recomposition of these dwellings based on a field survey. Four detailed case studies were chosen for analysis and it was discovered that three points can be raised as causes for spatial recomposition: (1) securing living space, (2) securing independence and (3) changes in access method and four locations can be raised as spacial recomposition locations: (a) dwelling unit interior, (b) residential block interior, (c) city block space and (d) space between residential blocks. In addition, the results of analysis of 60 buildings and 74 dwellings showed 289 spatial recomposition locations. In particular, it is characteristic that there are a high number of extensions to residential block interiors and many instances of privatization of corridors, addition of kitchens/bathrooms, interiorization of terraces and construction of small rooms on roofs can be seen. By organizing the spatial recomposition methods, it was discovered that eight ways exist: (1) stacked layer, (2) installation of interior floors, (3) addition of kitchens/bathrooms, (4) appropriation of space outside the dwelling, (5) fencing in space, (6) closing of stairways, (7) installation of stairways, and (8) removal of walls.

Yagi S.,Chiyoda Corporation | Nobel D.,Bandung Institute of Technology | Kawaguchi H.,Oriental Consultants Company Ltd
Transportation Research Record | Year: 2014

Following the analyses of household auto-motorcycle ownership and joint mode and destination choice models presented at previous TRB annual meetings, this paper offers the results of reverification of an activity-based microsimulation of travel demand for the Jakarta, Indonesia, metropolitan area that was developed from 2002 surveys. Comprehensive household and household member data from a large-scale commuter travel survey in 2010 were used as inputs to the micro-simulation. This paper first presents the overall microsimulation processes and model validation, along with several activity scheduling decision rules and intrahousehold interaction rides, including joint tour-activity generation and household maintenance lour allocation. For model reverilication, the microsimulation outcomes of the new base year of 2010 were investigated both internally and externally. The internal investigation involved Comparison with the detailed activity-related data from a person-tracking survey that was able to catch all the trips made by the respondents carrying a GPS logger. The external investigation involved the comparison with the observed traffic counts on two major screen lines in the region. The paper also discusses the results and secondary or emerging effects and trends caused by the changing transportation environment. Overall, the activity-based microsimulation model developed from the 2002 surveys provides only travel estimates of limited accuracy. Thus, the authors' further effort includes reestablishment of comprehensive activity-based models resulting from the latest abundant and accurate travel data source so as to make a powerful, practical decision-making tool useful for policy applications not only in Jakarta but also in other metropolitan regions.

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