@article{Abdalla2004,
  author    = {Abdalla, Jamal},
  title     = {Elements of an Agent-based Mediative Communication Protocol for Design Objects},
  doi       = {10.25643/bauhaus-universitaet.220},
  url       = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-2207},
  year      = {2004},
  abstract  = {Integrated structural engineering system usually consists of large number of design objects that may be distributed across different platforms. These design objects need to communicate data and information among each other. For efficient communication among design objects a common communication protocol need to be defined. This paper presents the elements of a communication protocol that uses a mediator agent to facilitate communication among design objects. This protocol is termed the Mediative Communication Protocol (MCP). The protocol uses certain design communication performatives and the semantics of an Agent Communication language (ACL) mainly the Knowledge and Query Manipulation Language (KQML) to implement its steps. Details of a Mediator Agent, that will facilitate the communication among design objects, is presented. The Unified Modeling Language (UML) is used to present the Meditative protocol and show how the mediator agent can be use to execute the steps of the meditative communication protocol. An example from structural engineering application is presented to demonstrate and validate the protocol. It is concluded that the meditative protocol is a viable protocol to facilitate object-to-object communication and also has potential to facilitate communication among the different project participants at the higher level of integrated structural engineering systems.},
  subject      = {Mehragentensystem},
  language  = {en}
}
@article{AlbertFreischladPullmann2004,
  author    = {Albert, Andrej and Freischlad, Mark and Pullmann, Torben},
  title     = {Acquisition of Conceptual Design Knowledge in Structural Engineering},
  doi       = {10.25643/bauhaus-universitaet.215},
  url       = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-2154},
  year      = {2004},
  abstract  = {Expert systems integrating fuzzy reasoning techniques represent a powerful tool to support practicing engineers during the early stages of structural design. In this context fuzzy models have proved themselves to be very suitable for the representation of complex design knowledge. However their definition is a laborious task. This paper introduces an approach for the design and the optimization of fuzzy systems based upon Genetic Programming. To keep the emerging fuzzy systems transparent a new framework for the definition of linguistic variables is also introduced.},
  subject      = {Mehragentensystem},
  language  = {en}
}
@inproceedings{AldaCremersBilek2004,
  author    = {Alda, Sascha and Cremers, Armin B. and Bilek, Jochen},
  title     = {Support of Collaborative Structural Design Processes through the Integration of Peer-to-Peer and Multiagent Architectures},
  doi       = {10.25643/bauhaus-universitaet.148},
  url       = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-1481},
  year      = {2004},
  abstract  = {Structural engineering projects are increasingly organized in networked cooperations due to a permanently enlarged competition pressure and a high degree of complexity while performing the concurrent design activities. Software that intends to support such collaborative structural design processes implicates enormous requirements. In the course of our common research work, we analyzed the pros and cons of the application of both the peer-to-peer (University of Bonn) and multiagent architecture style (University of Bochum) within the field of collaborative structural design. In this paper, we join the benefits of both architecture styles in an integrated conceptual approach. We demonstrate the surplus value of the integrated multiagent-peer-to-peer approach by means of an example scenario in which several structural engineers are co-operatively designing the basic structural elements of an arched bridge, applying heterogeneous CAD systems.},
  subject      = {Ingenieurbau},
  language  = {en}
}
@article{AzizAnumbaMiles2004,
  author    = {Aziz, Zeeshan and Anumba, Chimay and Miles, John},
  title     = {Towards a Semantic Grid Computing Platform for Disaster Management in Built Environment},
  doi       = {10.25643/bauhaus-universitaet.208},
  url       = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-2084},
  year      = {2004},
  abstract  = {Current disaster management procedures rely primarily on heuristics which result in their strategies being very cautious and sub-optimum in terms of saving life, minimising damage and returning the building to its normal function. Also effective disaster management demands decentralized, dynamic, flexible, short term and across domain resource sharing, which is not well supported by existing distributing computing infrastructres. The paper proposes a conceptual framework for emergency management in the built environment, using Semantic Grid as an integrating platform for different technologies. The framework supports a distributed network of specialists in built environment, including structural engineers, building technologists, decision analysts etc. It brings together the necessary technology threads, including the Semantic Web (to provide a framework for shared definitions of terms, resources and relationships), Web Services (to provide dynamic discovery and integration) and Grid Computing (for enhanced computational power, high speed access, collaboration and security control) to support rapid formation of virtual teams for disaster management. The proposed framework also make an extensive use of modelling and simulation (both numerical and using visualisations), data mining (to find resources in legacy data sets) and visualisation. It also include a variety of hardware instruments with access to real time data. Furthermore the whole framework is centred on collaborative working by the virtual team. Although focus of this paper is on disaster management, many aspects of the discussed Grid and Visualisation technologies will be useful for any other forms of collaboration. Conclusions are drawn about the possible future impact on the built environment.},
  subject      = {Mehragentensystem},
  language  = {en}
}
@article{ChangChangHuang2004,
  author    = {Chang, Chihyuan and Chang, Yuanchu and Huang, Shyhmeng},
  title     = {Application of a Agent Mechanism to the Small-scale Maintenance of School Buildings},
  doi       = {10.25643/bauhaus-universitaet.216},
  url       = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-2165},
  year      = {2004},
  abstract  = {This paper presents an agent-based software, Virtual Administrator System (VAS) for the smallscale maintenance of school buildings. VAS is capable of handling a heavy load of routine, lowtech maintenance jobs. It assigns a different priority to each job application according to its significance and urgency, and automatically adjusts schedules for maintenance engineers when on-site supervision is needed. The system can help ease off the burden of routine small-scale maintenance work, making it more cost-effective and efficient in the overall management of school building maintenance. VAS posts jobs on the Web in a multi-media format and classified all applications into four categories: the on-call maintenance contract, the term maintenance contract, the guaranty maintenance contract, and the regular maintenance contract. It then estimates their urgency level and passes the information to maintenance engineers who will decide whether on-site inspection is needed. Based on the engineers' feedback, VAS automatically implements the scheduling for inspection as well as sends out real-time or batch notifications to contractors. All these activities are recorded in a database to allow continuous research and data mining and the analysis and diagnosis of specific jobs for followup maintenance plans.},
  subject      = {Mehragentensystem},
  language  = {en}
}
@article{ElRayesHyari2004,
  author    = {El-Rayes, Khaled and Hyari, Khalied},
  title     = {A Multi-objective Model for Optimizing Construction Planning of Repetitive Infrastructure Projects},
  doi       = {10.25643/bauhaus-universitaet.213},
  url       = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-2135},
  year      = {2004},
  abstract  = {This paper presents the development of a model for optimizing resource utilization in repetitive infrastructure projects. The model provides the capability of simultaneous minimization of both project duration and work interruptions for construction crews. The model provides in a single run, a set of nondominated solutions that represent the tradeoff between these two objectives. The model incorporates a multiobjective genetic algorithm and scheduling algorithm. The model initially generates a randomly selected set of solutions that evolves to a near optimal set of tradeoff solutions in subsequent generations. Each solution represents a unique scheduling solution that is associated with certain project duration and a number of interruption days for utilized construction crews. As such, the model provides project planners with alternative schedules along with their expected duration and resource utilization efficiency.},
  subject      = {Mehragentensystem},
  language  = {en}
}
@article{GeibigSchnellenbachHeld2004,
  author    = {Geibig, Oliver and Schnellenbach-Held, Martina},
  title     = {Implementation of an Agent-based Bidding Consortium in the Architecture of an Agent-based Virtual Marketplace},
  doi       = {10.25643/bauhaus-universitaet.221},
  url       = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-2214},
  year      = {2004},
  abstract  = {In this research project we intend to transfer the whole AEC-Bidding process to an agent-based virtual marketplace. Hereby, the existing legal regulations have to be considered. Important aspects in developing the virtual marketplace are to provide the possibility to realize an agentbased bidding consortium as well as to integrate subcontractors.},
  subject      = {Mehragentensystem},
  language  = {en}
}
@inproceedings{HartmannMeissnerRueppel2004,
  author    = {Hartmann, Dietrich and Meißner, Udo F. and Rueppel, Uwe},
  title     = {Integration of Productmodel Databases into Multi-Agent Systems},
  doi       = {10.25643/bauhaus-universitaet.141},
  url       = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-1410},
  year      = {2004},
  abstract  = {This paper deals with two different agent-based approaches aimed at the incorporation of complex design information into multi-agent planning systems. The first system facilitates collaborative structural design processes, the second one supports fire engineering in buildings. Both approaches are part of two different research projects that belong to the DFG1 priority program 1103 entitled "Network-based Co-operative Planning Processes in Structural Engineering" (DFG 2000). The two approaches provide similar database wrapper agents to integrate relevant design information into two multi-agent systems: Database wrapper agents make the relevant product model data usable for further agents in the multi-agent system, independent on their physical location. Thus, database wrapper agents act as an interface between multi-agent system and heterogeneous database systems. The communication between the database wrapper agents and other requesting agents presumes a common vocabulary: a specific database ontology that maps database related message contents into database objects. Hereby, the software-wrapping technology enables the various design experts to plug in existing database systems and data resources into a specific multi-agent system easily. As a consequence, dynamic changes in the design information of large collaborative engineering projects are adequately supported. The flexible architecture of the database wrapper agent concept is demonstrated by the integration of an XML and a relational database system.},
  subject      = {Ingenieurbau},
  language  = {en}
}
@article{KicingerArciszewskiDeJong2004,
  author    = {Kicinger, Rafal and Arciszewski, Tomasz and De Jong, Kenneth},
  title     = {Distributed Evolutionary Design: Island-Model-based Optimization of Steel Skeleton Structures in Tall Buildings},
  doi       = {10.25643/bauhaus-universitaet.219},
  url       = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-2195},
  year      = {2004},
  abstract  = {This paper presents results of a study on distributed, or parallel, evolutionary computation in the topological design of steel structural systems in tall buildings. It describes results of extensive experimental research on various parallel evolutionary architectures applied to a complex structural design problem. The experiments were conducted using Inventor 2003, a networkbased evolutionary design support tool developed at George Mason University. First, a general introduction to evolutionary computation is provided with an emphasis on recent developments in parallel evolutionary architectures. Next, a discussion of conceptual design of steel structural systems in tall buildings is presented. Further, Inventor 2003 is briefly introduced as well as its design representation and evolutionary computation characteristics. Next, the results obtained from systematic design experiments conducted with Inventor 2003 are discussed. The objective of these experiments was to qualitatively and quantitatively investigate evolution of steel structural systems in tall buildings during a distributed evolutionary design process as well as to compare efficiency and effectiveness of various parallel evolutionary architectures with the traditional evolutionary design approaches. Two connectivity topologies (ring topology and fully-connected topology) have been investigated for four populations of structural designs evolving in parallel and using various migration strategies. Also, results of the initial sensitivity studies are reported in which two ways of initializing distributed evolutionary design processes were investigated, using either arbitrarily selected designs as initial parents or randomly generated ones. Finally, initial research conclusions are presented.},
  subject      = {Mehragentensystem},
  language  = {en}
}
@article{LikhitruangsilpIoannou2004,
  author    = {Likhitruangsilp, Veerasak and Ioannou, Photios},
  title     = {Risk-sensitive Markov Decision Process for Underground Construction Planning and Estimating},
  doi       = {10.25643/bauhaus-universitaet.224},
  url       = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-2247},
  year      = {2004},
  abstract  = {This paper presents an application of dynamic decision making under uncertainty in planning and estimating underground construction. The application of the proposed methodology is illustrated by its application to an actual tunneling project—The Hanging Lake Tunnel Project in Colorado, USA. To encompass the typical risks in underground construction, tunneling decisions are structured as a risk-sensitive Markov decision process that reflects the decision process faced by a contractor in each tunneling round. This decision process consists of five basic components: (1) decision stages (locations), (2) system states (ground classes and tunneling methods), (3) alternatives (tunneling methods), (4) ground class transition probabilities, and (5) tunneling cost structure. The paper also presents concepts related to risk preference that are necessary to model the contractor's risk attitude, including the lottery concept, utility theory, and the delta property. The optimality equation is formulated, the model components are defined, and the model is solved by stochastic dynamic programming. The main results are the optimal construction plans and risk-adjusted project costs, both of which reflect the dynamics of subsurface construction, the uncertainty about geologic variability as a function of available information, and the contractor's risk preference.},
  subject      = {Mehragentensystem},
  language  = {en}
}