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- 저자 : Vagelis (검색결과 5 건)
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Mapping of System Specifications on Hardware-Software Architectures
Mariatos,Vagelis,Birbas,Alex,Birbas,Michael,Petrellis,Nikos,Voros,Nikos 대한전자공학회 1997 ICVC : International Conference on VLSI and CAD Vol.5 No.1
In this paper a HW/SW co-design methodology is presented, proposing a solution to the problem of the exploration of the design solution space for an embedded system. This is achieved by modeling and exploring the various architectural alternatives, before committing to a specific implementation, based on an assignment-type mapping algorithm and on an efficient technique of combining alternative architectures for finding the best match. The implementation of an ATM adapter card, using this methodology, is used throughout the paper as a guiding example.
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Service life prediction of a reinforced concrete bridge exposed to chloride induced deterioration
Papadakis, Vagelis G. Techno-Press 2013 Advances in concrete construction Vol.1 No.3
While recognizing the problem of reinforcement corrosion and premature structural deterioration of reinforced concrete (RC) structures as a combined effect of mechanical and environmental actions (carbonation, ingress of chlorides), emphasis is given on the effect of the latter, as most severe and unpredictable action. In this study, a simulation tool, based on proven predictive models utilizing principles of chemical and material engineering, for the estimation of concrete service life is applied on an existing reinforced concrete bridge (${\O}$resund Link) located in a chloride environment. After a brief introduction to the structure of the models used, emphasis is given on the physicochemical processes in concrete leading to chloride induced corrosion of the embedded reinforcement. By taking under consideration the concrete, structural and environmental properties of the bridge investigated, an accurate prediction of its service life is taking place. It was observed that the proposed, and already used, relationship of service lifetime- cover is almost identical with a mean line between the lines derived from the minimum and maximum critical values considered for corrosion initiation. Thus, an excellent agreement with the project specifications is observed despite the different ways used to approach the problem. Furthermore, different scenarios of concrete cover failure, in the case when a coating is utilized, and extreme deicing salts attack are also investigated.
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Harmandaris, Vagelis A. 한국유변학회 2014 Korea-Australia rheology journal Vol.26 No.1
Study of complex macromolecular systems through molecular simulations is a very intense research area. Here we present an overview concerning the development and application of hierarchical particle coarse-graining molecular dynamics simulations on the quantitative prediction of the dynamics and the rheology of polymers. Through a systematic time mapping approach that involves data from detailed atomistic dynamic simulations the coarse-grained polymer model can be used to quantitatively predict the dynamics and the rheology of the polymeric chains in a very broad range of characteristic length and time scales. Data from the application of these approaches on the dynamics of polystyrene melts under equilibrium and under shear flow conditions are presented.
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Sustainable concrete mix design for a target strength and service life
Julia G. Tapali,Sotiris Demis,Vagelis G. Papadakis 사단법인 한국계산역학회 2013 Computers and Concrete, An International Journal Vol.12 No.6
Considering the well known environmental issues of cement manufacturing (direct and indirect levels of CO2 emissions), clinker replacement by supplementary cementing materials (SCM) can be a very promising first step in reducing considerably the associated emissions. However, such a reduction is possible up to a particular level of SCM utilization, influenced by the rate of its pozzolanic reaction. In this study a (4-step) structured methodology is proposed in order to be able to further adjust the concrete mix design of a particular SCM, in achieving additional reduction of the associated levels of CO2 emissions and being at the same time accepted from a derived concrete strength and service life point of view. On this note, the aim of this study is twofold. To evaluate the environmental contribution of each concrete component and to provide the best possible mix design configuration, balanced between the principles of sustainability (low environmental cost) and durability (accepted concrete strength and service life ). It is shown that such a balance can be achieved, by utilising SCM by-products in the concrete mix, reducing in this way the fixed environmental emissions without compromising the long-term safety and durability of the structure.
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Environmental assessment of a BIPV system
Demetrios N. Papadopoulos,Constantinos N. Antonopoulos,Vagelis G. Papadakis Techno-Press 2022 Advances in energy research Vol.8 No.1
The application of Photovoltaic (PV) power in the building sector, is expanding as part of the ongoing energy transition into renewables. The article addresses the question of sustainability of energy generated from PVs through an environmental assessment of a building-integrated PV system (BIPV) connected to the grid through net metering. Employing retrospective life cycle analysis (LCA), with the CCaLC2 software and ecoinvent data, the article shows that the carrying structure and other balance of system (BOS) components are responsible for a three times higher energy payback time than the literature average. However, total environmental impact can be lowered through reuse or reinstallation of PVs on the same building structure after the 30-year interval. Further ways to improve environmental efficiency include identifying the most polluting materials for each LCA parameter. The results of this study are of interest to researchers and producers of PVs and organizations investing and promoting decentralized power production through PVs.
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