The Experts below are selected from a list of 216 Experts worldwide ranked by ideXlab platform

Ayaho Miyamoto - One of the best experts on this subject based on the ideXlab platform.

  • development and practical application of a Bridge Management System j bms in japan
    Civil engineering infrastructures journal, 2015
    Co-Authors: Ayaho Miyamoto, Minoru Motoshita
    Abstract:

    This paper presents a new Bridge Management System (J-BMS). It is integrated with a concrete Bridge rating expert System that can be used to evaluate the serviceability of existing concrete Bridges. The proposed J-BMS not only evaluates the performance of Bridges, but also offers a rehabilitation strategy based on a combination of maintenance cost minimization and quality maximization. In this System, the genetic algorithm (GA) technique was used to search for an approximation of the optimal maintenance plan. This was constructed using Visual Basic and the C language. Furthermore, this paper examines the results of applying this System to some in-service Bridges and the results of questionnaire surveys of experts. A comparison of these results shows that this System can accurately predict optimal maintenance planning, as well as Bridge rating.

  • fuzzy concrete Bridge deck condition rating method for practical Bridge Management System
    Expert Systems With Applications, 2009
    Co-Authors: Amir Tarighat, Ayaho Miyamoto
    Abstract:

    Bridge Management System (BMS) is a tool for structured decision making and planning/scheduling for Bridge infrastructure inspection, maintenance and repair or retrofit. Any BMS is basically constructed based on data stored in inventory and inspection databases. One of the important and crucial efforts in managing Bridges is to have some criteria to show the current condition of the elements of Bridges based on the results from inspection data. As the results are not precise and are related to the depth and extent of the inspectors' expertise, there are some uncertainties in any evaluation. On the other side condition of Bridges are rated linguistically in many cases with some kinds of vagueness in description of the Bridge element conditions. Based on these facts in this paper a new fuzzy method is introduced to deal with these shortcomings from the uncertain and vague data. The fuzzy Bridge deck condition rating method is practically based on both subjective and objective results of existing inspection methods and tools. The parameters of the model are selected as fuzzy inputs with membership functions found from some statistical data and then the fuzziness of the condition rating is calculated by the fuzzy arithmetic rules inherent in the fuzzy expert System. Since one of the most proven and experienced advantages of fuzzy inference Systems is the tolerability for noisy (uncertain and vague) data it is believed that this proposed System can be an alternative method for current rating indices amongst many others which are almost used deterministically.

  • Development of a Bridge Management System for existing Bridges
    Advances in Engineering Software, 2001
    Co-Authors: Ayaho Miyamoto, Kei Kawamura, Hideaki Nakamura
    Abstract:

    Abstract Recently, the rehabilitation of Bridges has become a major social concern because the number of damaged Bridges has increased in Japan. Thus, there is a need to develop a practical Bridge Management System. The present study is an attempt to develop a new Bridge Management System (J-BMS) for damaged concrete Bridges. The J-BMS not only evaluates the performance of Bridges, but also offers a rehabilitation strategy based on a combination of maintenance cost minimization and quality maximization. Furthermore, application to existing concrete Bridges is presented so as to demonstrate the validity of the System.

  • development of a Bridge Management System j bms in japan
    First US Japan Workshop on Life-Cycle Cost Analysis and Design of Civil Infrastructure SystemsAmerican Society of Civil Engineers, 2001
    Co-Authors: Ayaho Miyamoto
    Abstract:

    This paper attempts to develop a new Bridge Management System (J-BMS), which is integrated with the Concrete Bridge Rating Expert System that can be used to evaluate the serviceability of existing concrete Bridges. The proposed J-BMS not only evaluates the performance of Bridges but also offers the rehabilitation strategy that is based on a combination of maintenance cost minimization and quality maximization. In this System, the Genetic Algorithms (GAs) technique was used to search for an approximation of the optimal maintenance plan and it was constructed by using Visual Basic and C language. Furthermore, a comparison of the results of applying this System to some actual in-service Bridges with the results of questionnaire surveys to experts shows that optimal maintenance planning as well as Bridge rating can be predicted accurately using this System.

  • Bridge Management System and maintenance optimization for existing Bridges
    Computer-aided Civil and Infrastructure Engineering, 2000
    Co-Authors: Ayaho Miyamoto, Kei Kawamura, Hideaki Nakamura
    Abstract:

    Of late, the maintenance of Bridges has become a major social concern, and thus the development of a practical Bridge Management System (BMS) is required. This paper describes a study that attempts to develop a new BMS for deteriorated concrete Bridges by evaluating the output results from a Bridge rating expert System currently under development. The proposed BMS offers various cost minimization and quality maximization. Genetic algorithms (GAs) are adopted for solving the optimization problem. These algorithms, which are based on the theory of evolution, create a suitable individual (optimal) solution through the repetition of 3 operators: selection, crossover, and mutation. Furthermore, applications to several existing concrete Bridges are presented so as to demonstrate the validity of the proposed BMS.

Hideaki Nakamura - One of the best experts on this subject based on the ideXlab platform.

  • Development of a Bridge Management System for existing Bridges
    Advances in Engineering Software, 2001
    Co-Authors: Ayaho Miyamoto, Kei Kawamura, Hideaki Nakamura
    Abstract:

    Abstract Recently, the rehabilitation of Bridges has become a major social concern because the number of damaged Bridges has increased in Japan. Thus, there is a need to develop a practical Bridge Management System. The present study is an attempt to develop a new Bridge Management System (J-BMS) for damaged concrete Bridges. The J-BMS not only evaluates the performance of Bridges, but also offers a rehabilitation strategy based on a combination of maintenance cost minimization and quality maximization. Furthermore, application to existing concrete Bridges is presented so as to demonstrate the validity of the System.

  • Bridge Management System and maintenance optimization for existing Bridges
    Computer-aided Civil and Infrastructure Engineering, 2000
    Co-Authors: Ayaho Miyamoto, Kei Kawamura, Hideaki Nakamura
    Abstract:

    Of late, the maintenance of Bridges has become a major social concern, and thus the development of a practical Bridge Management System (BMS) is required. This paper describes a study that attempts to develop a new BMS for deteriorated concrete Bridges by evaluating the output results from a Bridge rating expert System currently under development. The proposed BMS offers various cost minimization and quality maximization. Genetic algorithms (GAs) are adopted for solving the optimization problem. These algorithms, which are based on the theory of evolution, create a suitable individual (optimal) solution through the repetition of 3 operators: selection, crossover, and mutation. Furthermore, applications to several existing concrete Bridges are presented so as to demonstrate the validity of the proposed BMS.

  • practical applications of a Bridge Management System in japan
    Transportation Research Record, 2000
    Co-Authors: Ayaho Miyamoto, Kei Kawamura, Hideaki Nakamura
    Abstract:

    Recently, the necessity of developing a practical Bridge Management System (BMS) has been pointed out in Japan, because the maintenance of existing Bridges has become a major social concern. The aim of this study was to develop a practical BMS for deteriorated concrete Bridges. The proposed System (J-BMS) uses multilayered neural networks to predict deterioration processes in existing Bridges, to construct an optimal maintenance plan for repair or strengthening measures based on minimizing life-cycle cost, and to estimate the maintenance cost. A comparison of the results of applying this System to some actual in-service Bridges with the results of questionnaire surveys of experts indicates that optimal maintenance planning as well as Bridge rating can be predicted accurately by this System.

  • multiobjective optimization of maintenance planning for existing Bridges by using Bridge Management System bms
    Doboku Gakkai Ronbunshu, 1998
    Co-Authors: Ayaho Miyamoto, Kei Kawamura, Hideaki Nakamura
    Abstract:

    本研究は, 従来より著者らが開発してきた「橋梁維持管理支援システム (Bridge Management System)」の核となる1機能として, 対象とする各橋梁ごとに経済性および橋梁部材の品質の両方を考慮した最適維持管理 (補修・補強) 計画が作成できる機能の追加を行ったものである. なお, 多目的問題に対してはe-制限法を適用し, 最適解の探索には並列的な解探索が可能である遺伝的アルゴリズム (GA) を適用した. また, 構築したシステムの有用性を検討するため, 実橋への適用を試み, 出力結果の妥当性を考察した.

Dan M. Frangopol - One of the best experts on this subject based on the ideXlab platform.

  • optimal Bridge maintenance planning using improved multi objective genetic algorithm
    Structure and Infrastructure Engineering, 2006
    Co-Authors: Hitoshi Furuta, Takahiro Kameda, Koichiro Nakahara, Yuji Takahashi, Dan M. Frangopol
    Abstract:

    In order to establish a rational Bridge Management program, it is necessary to develop a cost-effective decision-support System for the maintenance of Bridges. In this paper, an attempt is made to develop a Bridge Management System that can provide practical maintenance plans by using an improved multi-objective genetic algorithm. A group of Bridges is analyzed to demonstrate the applicability and efficiency of the proposed method.

  • multiobjective maintenance planning optimization for deteriorating Bridges considering condition safety and life cycle cost
    Journal of Structural Engineering-asce, 2005
    Co-Authors: Min Liu, Dan M. Frangopol
    Abstract:

    Many of the currently available Bridge Management System tools focus on minimizing life-cycle maintenance cost of deteriorating Bridges while imposing constraints on structural performance. The computed single optimal maintenance planning solution, however, may not necessarily meet a Bridge manager's specific requirements on lifetime Bridge performance. In this paper the life-cycle maintenance planning of deteriorating Bridges is formulated as a multiobjective optimization problem that treats the lifetime condition and safety levels as well as life-cycle maintenance cost as separate objective functions. A multiobjective genetic algorithm is used as the search engine to automatically locate a large pool of different maintenance scenarios that exhibits an optimized tradeoff among conflicting objectives. This tradeoff provides improved opportunity for Bridge managers to actively select the final maintenance scenario that most desirably balances life-cycle maintenance cost, condition, and safety levels of deteriorating Bridges.

Marjan Sarshar - One of the best experts on this subject based on the ideXlab platform.

  • a geographic information System gis based Bridge Management System
    Computer-aided Civil and Infrastructure Engineering, 1999
    Co-Authors: T H She, Marjan Sarshar
    Abstract:

    Many Bridge authorities responsible for the Management and maintenance of Bridges in their road networks use computer-based databases or Bridge Management Systems (BMSs) as data Management and analysis tools to aid them in performing many important Bridge Management functions and decisions. Due to superior spatial data handling capabilities, geographic information System (GIS) technology is increasingly being considered for implementation in many infrastructure planning and Management Systems, including Bridge Management Systems. This article describes the use of a hybrid business and information modeling approach to develop a model to support the development of a geographic information System (GIS)–based Bridge Management System. It presents the architecture for implementing such a System for the Bridge Unit of the Public Works Department (JKR) in Malaysia. Most GIS Systems are technology-based. The methodology used here captures organizational processes as well as information Systems requirements. This facilitates business decision making and business process change. Using this hybrid modeling approach, first the organization's business objectives, functions, and processes are modeled. These business requirements form the basis of detailed information requirement analysis. Object-oriented methods are then employed to define object models and show the relationships between objects and the operations performed on them. Finally, the software architecture and interface for developing such a prototype GIS-based BMS is described and some sample screen outputs of the System to analyze and visualize over 2500 actual Malaysian Bridge structures in the road network are presented. Future developments of the infrastructure set out here are capable of providing a BMS that supports business processes and facilitates business process change.

Kei Kawamura - One of the best experts on this subject based on the ideXlab platform.

  • Development of a Bridge Management System for existing Bridges
    Advances in Engineering Software, 2001
    Co-Authors: Ayaho Miyamoto, Kei Kawamura, Hideaki Nakamura
    Abstract:

    Abstract Recently, the rehabilitation of Bridges has become a major social concern because the number of damaged Bridges has increased in Japan. Thus, there is a need to develop a practical Bridge Management System. The present study is an attempt to develop a new Bridge Management System (J-BMS) for damaged concrete Bridges. The J-BMS not only evaluates the performance of Bridges, but also offers a rehabilitation strategy based on a combination of maintenance cost minimization and quality maximization. Furthermore, application to existing concrete Bridges is presented so as to demonstrate the validity of the System.

  • Bridge Management System and maintenance optimization for existing Bridges
    Computer-aided Civil and Infrastructure Engineering, 2000
    Co-Authors: Ayaho Miyamoto, Kei Kawamura, Hideaki Nakamura
    Abstract:

    Of late, the maintenance of Bridges has become a major social concern, and thus the development of a practical Bridge Management System (BMS) is required. This paper describes a study that attempts to develop a new BMS for deteriorated concrete Bridges by evaluating the output results from a Bridge rating expert System currently under development. The proposed BMS offers various cost minimization and quality maximization. Genetic algorithms (GAs) are adopted for solving the optimization problem. These algorithms, which are based on the theory of evolution, create a suitable individual (optimal) solution through the repetition of 3 operators: selection, crossover, and mutation. Furthermore, applications to several existing concrete Bridges are presented so as to demonstrate the validity of the proposed BMS.

  • practical applications of a Bridge Management System in japan
    Transportation Research Record, 2000
    Co-Authors: Ayaho Miyamoto, Kei Kawamura, Hideaki Nakamura
    Abstract:

    Recently, the necessity of developing a practical Bridge Management System (BMS) has been pointed out in Japan, because the maintenance of existing Bridges has become a major social concern. The aim of this study was to develop a practical BMS for deteriorated concrete Bridges. The proposed System (J-BMS) uses multilayered neural networks to predict deterioration processes in existing Bridges, to construct an optimal maintenance plan for repair or strengthening measures based on minimizing life-cycle cost, and to estimate the maintenance cost. A comparison of the results of applying this System to some actual in-service Bridges with the results of questionnaire surveys of experts indicates that optimal maintenance planning as well as Bridge rating can be predicted accurately by this System.

  • multiobjective optimization of maintenance planning for existing Bridges by using Bridge Management System bms
    Doboku Gakkai Ronbunshu, 1998
    Co-Authors: Ayaho Miyamoto, Kei Kawamura, Hideaki Nakamura
    Abstract:

    本研究は, 従来より著者らが開発してきた「橋梁維持管理支援システム (Bridge Management System)」の核となる1機能として, 対象とする各橋梁ごとに経済性および橋梁部材の品質の両方を考慮した最適維持管理 (補修・補強) 計画が作成できる機能の追加を行ったものである. なお, 多目的問題に対してはe-制限法を適用し, 最適解の探索には並列的な解探索が可能である遺伝的アルゴリズム (GA) を適用した. また, 構築したシステムの有用性を検討するため, 実橋への適用を試み, 出力結果の妥当性を考察した.