A Systems’ Approach to the Design of a Methodology and Mathematical Model for Determining the Most Critical Links of a Highway Network Gerard Ibarra PhD Candidate Committee Update: April 5, 2006

Systems Engineering Process Define the Problem and Identify the Needs Critical Infrastructure Protection is an important topic to every major city in the US Homeland Security funding being more scrutinize For the transportation sector, need help with identifying the k-critical links of a highway network

Systems Engineering Process Define the Problem

Systems Engineering Process Initial Requirements To develop a process and mathematical model to help determine the k-critical links of a highway network Feasibility Analysis No current simulation model capable of feasibly performing k-critical links of a highway network Models that look at CIP do not include geographical interdependencies – a systems view of the links

Systems Engineering Process Operational Requirements Mission Definition Performance and Physical Parameters Operational Deployment Operational Life Cycle Utilization Requirements Effectiveness Factor Environment

Systems Engineering Process Maintenance and Support Specific to the process and mathematical model Technical Performance Parameters Accuracy of k-critical links Model’s information processing time Maintainability and Supportability of system Functional Analysis Details of the Process and Model

Systems Engineering Process Design Synthesis Trade-off Analysis Selection of Preferred Candidate

Systems Engineering Process The bottom line:

A System’s Prospective View K-critical Links Rail Lines Power Lines Population Hazardous Cargo System’s View Model

A System’s Prospective View Houston

A System’s Prospective View K-Critical Links The link with the most flow under normal conditions is the most critical The link with the most cuts is the most critical The link with maximum sensitivity is the most critical

A System’s Prospective View Geographical Interdependencies (GI) Rail and Power Lines (Heuristic: Transportation) Proximity Parallel Transverse Population (Bureau of Statistics: Public Health) Proximity Hazardous Cargo (DOT: Chem. & HazMat) Developed a methodology

A System’s Prospective View Transportation Public Health Chem. & HazMat Critical Infrastructures

Rail Lines Intersecting Highways – I610 and Inside 1 – 24 Intersections I610 and Inside, 25 – 35 outside I610 up to Beltway A

A System’s Prospective View Mathematical Model Utility Theory: Additive Function Simulation: Monte Carlo Statistics: Weighted Averages and Variances Decision Maker’s Input Professional/Expert’s Input

A System’s Prospective View Mathematical Model

A System’s Prospective View Mathematical Model (Continued)

A System’s Prospective View Mathematical Model

Conclusion Applied the SE process for the design of a system solution for the most critical links of a highway network Developed a methodology for determining those most critical links Constructed a mathematical model for evaluating those links based on the network’s GI Provided maintainability and supportability design criteria in the methodology and model