Wilfredo Yushimito | Universidad Adolfo Ibáñez (original) (raw)
Address: Viña del Mar, Chile
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Papers by Wilfredo Yushimito
International Journal of Critical Infrastructures
Critical infrastructure refers to the type of facilities, services, and installations (e.g., tran... more Critical infrastructure refers to the type of facilities, services, and installations (e.g., transportation, communication, energy systems) that are essential for the functioning of a community, city or country. This paper describes the findings of the research conducted to identify the transportation network critical facilities (road links) and its impacts on urban mobility for the city of Medellin, the second largest city in Colombia. The paper analyses the negative effects on travel time when a facility is disrupted or the capacity is suddenly reduced (e.g., accident, natural or manmade disaster, dedicated bike-route, maintenance, construction). Criticality is identified following two methodologies: 1) comparing the travel time of the network users solving the User Equilibrium (UE) Traffic Assignment problem between the base case and the disrupted network; and 2) assessing the impact of the disrupted facility on the path travel times between affected origin-destinations zones.
Transportation Research Record, 2008
Journal of Transportation Security, 2009
Assessing the importance of transportation facilities is an increasingly growing topic of interes... more Assessing the importance of transportation facilities is an increasingly growing topic of interest to federal and state transportation agencies. In the wake of recent terrorist attacks and recurring manmade and natural disasters, significant steps are needed to improve security at both state and metropolitan level. This paper proposes a heuristic procedure using concepts of complex networks science to assess the importance of highway transportation networks using travel time as the performance measure to assess criticality. We demonstrate the proposed technique both in a theoretical network (Sioux Falls network) and in a built-up network to assess the criticality of the major infrastructures that are used to access Manhattan in an AM peak hour. The results demonstrate the efficacy of the procedure to determine critical links in a transportation network.
Transportation Research Part C-emerging Technologies, 2009
Networks & Spatial Economics, 2012
This paper provides insights to locate a finite number of distribution centers to provide a quick... more This paper provides insights to locate a finite number of distribution centers to provide a quick response time for disaster relief incorporating social costs within the modeling framework. We explore theoretical aspects of the problem formulation and propose a model that maximizes coverage of affected regions while minimizing human suffering through the use of a social cost function. Our results show that the social cost function is minimized within the area enclosed by the Voronoi region for a chosen facility. We also propose a heuristic algorithm to solve the problem of locating these facilities in a reasonable amount of time. Since the quality of the solution and the running time depends largely on the initial starting points for the heuristic, we provide recommendations to choose the initial starting points. The proposed approach has the potential to significantly improve the efficiency of distributing critical supplies in disasters by optimizing the response time.
International Journal of Critical Infrastructures
Critical infrastructure refers to the type of facilities, services, and installations (e.g., tran... more Critical infrastructure refers to the type of facilities, services, and installations (e.g., transportation, communication, energy systems) that are essential for the functioning of a community, city or country. This paper describes the findings of the research conducted to identify the transportation network critical facilities (road links) and its impacts on urban mobility for the city of Medellin, the second largest city in Colombia. The paper analyses the negative effects on travel time when a facility is disrupted or the capacity is suddenly reduced (e.g., accident, natural or manmade disaster, dedicated bike-route, maintenance, construction). Criticality is identified following two methodologies: 1) comparing the travel time of the network users solving the User Equilibrium (UE) Traffic Assignment problem between the base case and the disrupted network; and 2) assessing the impact of the disrupted facility on the path travel times between affected origin-destinations zones.
Transportation Research Record, 2008
Journal of Transportation Security, 2009
Assessing the importance of transportation facilities is an increasingly growing topic of interes... more Assessing the importance of transportation facilities is an increasingly growing topic of interest to federal and state transportation agencies. In the wake of recent terrorist attacks and recurring manmade and natural disasters, significant steps are needed to improve security at both state and metropolitan level. This paper proposes a heuristic procedure using concepts of complex networks science to assess the importance of highway transportation networks using travel time as the performance measure to assess criticality. We demonstrate the proposed technique both in a theoretical network (Sioux Falls network) and in a built-up network to assess the criticality of the major infrastructures that are used to access Manhattan in an AM peak hour. The results demonstrate the efficacy of the procedure to determine critical links in a transportation network.
Transportation Research Part C-emerging Technologies, 2009
Networks & Spatial Economics, 2012
This paper provides insights to locate a finite number of distribution centers to provide a quick... more This paper provides insights to locate a finite number of distribution centers to provide a quick response time for disaster relief incorporating social costs within the modeling framework. We explore theoretical aspects of the problem formulation and propose a model that maximizes coverage of affected regions while minimizing human suffering through the use of a social cost function. Our results show that the social cost function is minimized within the area enclosed by the Voronoi region for a chosen facility. We also propose a heuristic algorithm to solve the problem of locating these facilities in a reasonable amount of time. Since the quality of the solution and the running time depends largely on the initial starting points for the heuristic, we provide recommendations to choose the initial starting points. The proposed approach has the potential to significantly improve the efficiency of distributing critical supplies in disasters by optimizing the response time.