Lauren Gardner

The Food Distributed Extendable Complementarity Model (Food-DECO)

Research Blog /

[vc_row type=”in_container” full_screen_row_position=”middle” scene_position=”center” text_color=”dark” text_align=”left” top_padding=”30″ overlay_strength=”0.3″ shape_divider_position=”bottom”][vc_column column_padding=”no-extra-padding” column_padding_position=”all” background_color_opacity=”1″ background_hover_color_opacity=”1″ column_shadow=”none” column_border_radius=”none” width=”1/1″ tablet_text_alignment=”default” phone_text_alignment=”default” column_border_width=”none” column_border_style=”solid”][vc_column_text][nectar_dropcap color=”#3452ff”]S[/nectar_dropcap]carcity of food is perhaps the most heartbreaking condition on our planet. More than one-quarter of the world’s population has an insecure food supply, and those populations are also in parts of the world expected […]

The Food Distributed Extendable Complementarity Model (Food-DECO) Read More »

S An exact solution method for binary equilibrium problems with compensation and the power market uplift problem

Leave a Comment / Energy, Peer-reviewed Journal Articles, Publications /

Huppmann, D., Siddiqui, S., ( 2018 )

An exact solution method for binary equilibrium problems with compensation and the power market uplift problem

European Journal of Operational Research, 266(2): 622-638

Edit PDF link hereIcon

S An exact solution method for binary equilibrium problems with compensation and the power market uplift problem Read More »

S Multimodal Transportation Flows in Energy Networks with an Application to Crude Oil Markets

Leave a Comment / Display on Homepage, Energy, Peer-reviewed Journal Articles, Publications, Transportation /

Oke, O., Huppmann, D., Marshall, M., Poulton, R., Siddiqui, S., ( 2018 )

Multimodal Transportation Flows in Energy Networks with an Application to Crude Oil Markets

Networks & Spatial Economics

Edit PDF link hereIcon

S Multimodal Transportation Flows in Energy Networks with an Application to Crude Oil Markets Read More »

S Evaluating Nurse Staffing Levels in Perianesthesia Care Units Using Discrete Event Simulation

Leave a Comment / Health, Peer-reviewed Journal Articles, Publications /

Siddiqui, S., Morse, E., Levin, S., ( 2017 )

Evaluating Nurse Staffing Levels in Perianesthesia Care Units Using Discrete Event Simulation

IISE Transactions on Healthcare Systems Engineering, 7(4): 215-223.

Edit PDF link hereIcon

S Evaluating Nurse Staffing Levels in Perianesthesia Care Units Using Discrete Event Simulation Read More »

S Evaluating the role of electricity storage by considering short-term operation in long-term planning

Energy, Peer-reviewed Journal Articles, Publications /

Brijs, T., van Stiphout, A., Siddiqui, S., Belmans, R., ( 2017 )

Evaluating the role of electricity storage by considering short-term operation in long-term planning

Sustainable Energy, Grids and Networks, 10: 104-117

Edit PDF link hereIcon

S Evaluating the role of electricity storage by considering short-term operation in long-term planning Read More »

S Analysis of the global wood‐chip trade’s response to renewable energy policies using a spatial price equilibrium model

Leave a Comment / Energy, Peer-reviewed Journal Articles, Publications, Transportation /

Jiang, W., Searle, S., & Siddiqui, S., ( 2017 )

Analysis of the global wood‐chip trade’s response to renewable energy policies using a spatial price equilibrium model

Biofuels, Bioproducts and Biorefining, 11(3): 505-520

Edit PDF link hereIcon

S Analysis of the global wood‐chip trade’s response to renewable energy policies using a spatial price equilibrium model Read More »

In radiation therapy with continuous dose delivery for Gamma Knife® Perfexion™, the dose is delivered while the radiation machine is in movement, as oppose to the conventional step-and-shoot approach which requires the unit to stop before any radiation is delivered. Continuous delivery can increase dose homogeneity and decrease treatment time. To design inverse plans, we first find a path inside the tumor volume, along which the radiation is delivered, and then find the beam durations and shapes using a mixed-integer programming optimization (MIP) model. The MIP model considers various machine-constraints as well as clinical guidelines and constraints.

Radiation therapy is frequently used in diagnosing patients with cancer. Currently, the planning of such treatments is typically done manually which is time-consuming and prone to human error. The new advancements in computational powers and treating units now allow for designing treatment plans automatically.

To design a high-quality treatment, we select the beams sizes, positions, and shapes using optimization models and approximation algorithms. The optimization models are designed to deliver an appropriate amount of dose to the tumor volume while simultaneously avoiding sensitive healthy tissues. In this project, we work on finding the best beam positions for the radiation focal points for Gamma Knife® Perfexion™, using quadratic programming and algorithms such as grassfire and sphere-packing.