Urban Transit and Routing

Transit and routing services play a vital role in promoting sustainable and equitable living. Social mobility is a key indicator of quality of life, and these services enhance mobility security by expanding access and choice. Modern transit systems, often integrated with multimodal networks, help ensure first- and last-mile connectivity and support access to essential needs such as grocery shopping and healthcare. Routing services, in turn, bolster the supply of services that sustain daily life by enabling more efficient and sophisticated business and operational systems. Together, optimized transit and routing systems bolster individual well-being, enhance social welfare, and help prevent marginalization, creating a virtuous cycle of mutual benefit for society and its members.

Multi-Commodity Service Provisions and Dispatching

I develop an integer programming model to represent operational requirements of various businesses that rely on resources from multiple sources delivered sequentially or at specific times (e.g., for restocking or for perishable goods).

The Serviceman Problem (SP)
Multi-commodity service and routing
Combinatorial optimization
Greedy heuristic

The Serviceman Problem: Planning Multi-period Service Provision and Dispatching Operations, Jisoon Lim, Iason Liagkas, and Neda Masoud (in preparation)

Equitable Transit Design

I explore challenges from small, rural cities in the U.S. that are often overlooked in transit planning due to their expansive geography and low demand, which make traditional transit unscalable and cost-inefficient.

Transit equity
Shuttles and Buses
Aggregation-Disaggregation method
Cost analysis

An Aggregation-Disaggregation Algorithm for Transit Planning, Golbarg Dokhani, Jisoon Lim, Neda Masoud, Amirmahdi Tafreshian, and Yiyang Wang (in preparation)

Incentive Program for Urban Air Mobility

I design a pricing mechanism that encourages new groups of customers to participate in multimodal journeys that include a UAM segment, thereby allowing the fleet operators to realize increased demand.

UAM commercialization
Ground-Air integrated multimodal transportation
Incentive program
Value-of-time (VoT)

Urban Air Mobility Incentive Pricing for Ground-Air Integrated Multimodal Transportation, Jisoon Lim, Max Z. Li, and Neda Masoud (in preparation)

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