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Briano E.,DIP Development of Innovative Projects Consortium Office Tower | Giribone P.,Genova Engineering, LLC. | Revetria R.,Genova Engineering, LLC.
Proceedings of the IASTED International Conference on Modelling, Identification and Control | Year: 2010

This paper regards the study of a supply chain for products characterized by a short life cycle, meaning with that a particular type of good that is produced and sold only for a limited period of time, such as fashion goods, health care services, electronic products or some foodstuffs. The real case study regarding a particular product of an important Italian food company producing snacks, biscuits and bread substitutes has been analyzed. Temporarily data in the model are by now assumed by the authors because of delays on their provision, but in the extended version of this paper the real company data, properly modified for reason of confidentiality, will be utilized. More in particular a simulation model, implemented according to the System Dynamics approach, has been developed and shown. This kind of methodology is particularly useful to study the behavior of complex dynamics systems, such as the case object of this work. Moreover it makes able to consider time delays and feedback loops, which dramatically influence the structure and the relative behavior of the system. Powersim Studio software, thanks to its flexibility and completeness, has been chosen among all the available computer simulation softwares for System Dynamics. By simulating the model it has been possible to highlight the most critical issues along the supply chain to focus on, with the final goal of minimizing costs and maximizing the company profit. Besides, "what-if'' analysis carried out on the model have shown which is the best policy to adopt in terms -for instance - of safety stock to hold or demand planning methodology to adopt. Further studies will be dedicated to make these kind of supply chain more resilient or, in other words, less vulnerable towards unexpected and damaging events.


Briano E.,DIP Development of Innovative Projects Consortium Office Tower | Caballini C.,Genova Engineering, LLC. | Mosca R.,Genova Engineering, LLC. | Revetria R.,Genova Engineering, LLC. | Testa A.,Genova Engineering, LLC.
Proceedings of the IASTED International Conference on Modelling, Identification and Control | Year: 2010

Safety in motorway tunnels has assumed even more importance after some catastrophic accidents like the one in Mont-Blanc tunnel in March, 24 th 1999, where about 39 people died burnt in flames or intoxicated by the smoke and several dozens were seriously injured. In consideration to this, the authors propose the study of an emergency procedure regarding a motorway tunnel evacuation after an accident producing fire and high-density smoke. A simulation model has been developed and shown using Java™ Software, where the behavior of the people escaping from the tunnel is modeled and studied in order to assess the effectiveness of the emergency procedures, signals and infrastructures (emergency exits, SOS columns, etc.). In order to take into account the most significant state variables that could affect human behavior in this particular situation, the model has been built considering the main aspects of the PECS (Physical Emotional Cognitive Social) reference models, in which physical, emotional, cognitive and social factors have to be studied. This case study is similar to Schmidt's "Adam's World" [1] where Adam, a primitive man, has to cope with an environment that presents some danger points to be avoided and other points where to regain energy or, in this case, to escape from. This work is a natural evolution of Adam's world because social aspects - not present in Schmidt's model because Adam lives alone - play a great role. After describing and analyzing the model and its results, a section is dedicated to a graphical 3-D model, developed in Blender™ and animated with Wolverine Software Proof Animation™, which reproduces the effects of the accident, with a particular focus on smoke behavior.


Briano E.,DIP Development of Innovative Projects Consortium Office Tower | Briano E.,Genova Engineering, LLC. | Caballini C.,DIP Development of Innovative Projects Consortium Office Tower | Caballini C.,Genova Engineering, LLC. | And 6 more authors.
WSEAS Transactions on Systems | Year: 2010

Safety in motorway tunnels has become a critical issue in the last years, especially after the accident happened in 1999 inside the Mont Blanc tunnel, causing 39 deaths and several dozens of intoxications and wounded people. After this tragic event, the European Union imposed stricter regulations and procedures for emergency situations inside road tunnels longer than 1000 m. According to this situation, the authors propose the use of M&S (Modeling and Simulation) in order to manage a tunnel evacuation after a fire exploding in consequence to an accident, taking into account a series of significant factors like the road signs position (new criteria have been introduced with new regulation), but also human factors which significantly affect the procedure outcome. First a 2-D simulation model has been developed using JavaTM Software, in which the user can analyze the behavior of the people escaping and the dynamics of the fire exploded and, consequently, assess the effectiveness of all the emergency procedures and infrastructures. In particular, regarding the state variables related to the human behavior, the model takes into account the main aspects of PECS (Physical Emotional Cognitive Social) reference models, in which physical, emotional, cognitive and social factors have to be studied. The model presented in this work is in fact quite similar to the one described by (Schmidt, 2000), called "Adam's World" [1] where Adam, a primitive man, lives in an environment having food sources where he can replenish his energy level, but also traps and danger points to be avoided in order not to consume his energy faster. The aim of the two models is the same: first of all preserve life and health, but the great difference between Schmidt's model and the authors' one is that in Adam's World the social aspect is missing (Adam live alone in his world), while in the evacuation model social aspects can significantly affect the individual's decisions. Upstream of the evacuation model, a weighted analysis needs to be considered, in fact the individual has to operate different choices considering several aspects, like health or goods preservation, familiar aspects, panic and so on. For this reason a suitable methodology has been detected: the Analytic Hierarchic Process (AHP), implemented by the American mathematician Thomas Saaty, which introduced this technique for Multi-Criteria Analysis. After the considerations on the individuals behavior based on the results of the analysis, the evacuation model and its results are described and analyzed in the following sections and, in the final part of the paper, a description of a 3-D tunnel model devoted to study in particular smoke dynamics is provided, thus it is possible to evaluate the impact of the smoke on the flow of the people escaping from the tunnel.

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