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A PLanning Model with One Million Scenarios Solved on an Affordable Parallel Machine

Fragniere, E.; Gondzio, J.; Vial, J.-P. - Geneva School of Economics and Management, Université … - 1998

Stochastic programs inevitably get huge if they are to model real life problems accurately. Nowadays only massive parallel machines can solve them but at a cost few decision makers can afford. We report hereon a deterministic equivalent linear programming model of 1,111,112 constraints and...

Persistent link: https://www.econbiz.de/10005478994

Regularized Symmetric Indefinite Systems in Interior Point Methods for Linear and Quadratic Optimization

Altman, A.; Gondzio, J. - Geneva School of Economics and Management, Université … - 1998

This paper presents linear algebra techniques used in the implementation of an interior point method for solving linear programs and convex quadratic programs with linear constraint. The new regularization techniques for Newton equation system applicable to both symmetric positive definite and...

Persistent link: https://www.econbiz.de/10005478999

Landfilling, Set-Up Costs and Optimal Capacity

André, Francisco J.; Cerdá, Emilio - Centro de Estudios Andaluces, Government of Andalusia - 2002

We study the optimal capacity of landfills taking into account their sequential nature. Such an optimal capacity is characterized by the so-called Optimal Capacity Condition. Particular versions of this condition are obtained for two alternative settings: first, if all the landfills are to have...

Persistent link: https://www.econbiz.de/10005121324

A multicriteria model's survey: state of the art and some necessary capabilities of future models

Pongpeng, Jakrapong; Liston, John - In: Construction Management and Economics 21 (2003) 7, pp. 665-670

To identify a state-of-the-art model and some necessary capabilities for developing future multicriteria models, the literature on multicriteria models in operations research was surveyed. All the models required subjective inputs from decision-makers. A utility function was regarded as the best...

Persistent link: https://www.econbiz.de/10005438526

Selection of funding schemes by a borrowing decision model: a Hong Kong case study

Tang, C. M.; Wong, C. W. Y.; Leung, A. Y. T.; Lam, K. C. - In: Construction Management and Economics 24 (2006) 4, pp. 349-365

optimization problems are key challenges in solving construction finance decisions. The selection of funding schemes by a modified …

Persistent link: https://www.econbiz.de/10005438600

Will implementation of green gas into the gas supply be feasible in the future?

Bekkering, J.; Hengeveld, E.J.; van Gemert, W.J.T.; … - In: Applied Energy 140 (2015) C, pp. 409-417

The energy efficiency, greenhouse gas reduction and cost price of a green gas supply chain were evaluated. The considered supply chain is based on co-digestion of dairy cattle manure and maize, biogas upgrading and injection into a distribution gas grid. A reference scenario was defined which...

Persistent link: https://www.econbiz.de/10011189391

Short-term combined economic and emission hydrothermal optimization by surrogate differential evolution

Glotić, Arnel; Zamuda, Aleš - In: Applied Energy 141 (2015) C, pp. 42-56

This paper present short-term combined economic and emission hydrothermal optimization, addressing total fuel costs and … optimization problem difficulty. The optimal balance between the addressed objectives, that conflict with each other, can be … paper proposes a novel master–slave model optimization algorithm, where the optimal thermal schedules are obtained within …

Persistent link: https://www.econbiz.de/10011189412

Optimization of wastewater microalgae saccharification using dilute acid hydrolysis for acetone, butanol, and ethanol fermentation

Castro, Yessica A.; Ellis, Joshua T.; Miller, Charles D.; … - In: Applied Energy 140 (2015) C, pp. 14-19

consequences associated with fuel shortages and climate change. Optimization of sugar liberation from wastewater algae through acid …

Persistent link: https://www.econbiz.de/10011189419

Channel depth, air mass flow rate and air distribution duct diameter optimization of photovoltaic thermal (PV/T) air collectors linked to residential buildings

Farshchimonfared, M.; Bilbao, J.I.; Sproul, A.B. - In: Renewable Energy 76 (2015) C, pp. 27-35

Photovoltaic thermal (PV/T) air collector design requires an accurate determination of key parameters such as the channel depth and the air mass flow rate. This paper focuses on PV/T air collectors linked to an air distribution system with the aim of optimizing the channel depth, the air mass...

Persistent link: https://www.econbiz.de/10011189883

Achieving California's 80% greenhouse gas reduction target in 2050: Technology, policy and scenario analysis using CA-TIMES energy economic systems model

Yang, Christopher; Yeh, Sonia; Zakerinia, Saleh; Ramea, … - In: Energy Policy 77 (2015) C, pp. 118-130

The CA-TIMES optimization model of the California Energy System (v1.5) is used to understand how California can meet …

Persistent link: https://www.econbiz.de/10011190036