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Minimizing fuel emissions by optimizing vessel schedules in liner shipping with uncertain port times
Qi, Xiangtong; Song, Dong-Ping - In: Transportation Research Part E: Logistics and … 48 (2012) 4, pp. 863-880
We consider the problem of designing an optimal vessel schedule in the liner shipping route to minimize the total … expected fuel consumption (and emissions) considering uncertain port times and frequency requirements on the liner schedule … insights regarding the impact of port uncertainties. Case studies are given to illustrate the results. …
Persistent link: https://www.econbiz.de/10010755040
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The ship routing and freight assignment problem for daily frequency operation of maritime liner shipping
Lin, Dung-Ying; Tsai, Yu-Yun - In: Transportation Research Part E: Logistics and … 67 (2014) C, pp. 52-70
frequency operation of liner shipping. A solution procedure that incorporates a Lagrangian relaxation technique and local search …
Persistent link: https://www.econbiz.de/10010785142
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An integrated approach for port selection, ship scheduling and financial analysis
Lam, Jasmine - In: Netnomics 11 (2010) 1, pp. 33-46
Persistent link: https://www.econbiz.de/10008526663
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Column generation bounds for numerical microaggregation
Aloise, Daniel; Hansen, Pierre; Rocha, Caroline; Santi, … - In: Journal of Global Optimization 60 (2014) 2, pp. 165-182
The biggest challenge when disclosing private data is to share information contained in databases while protecting people from being individually identified. Microaggregation is a family of methods for statistical disclosure control. The principle of microaggregation is that confidentiality...
Persistent link: https://www.econbiz.de/10010993998
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Computational bounds for elevator control policies by large scale linear programming
Heinz, Stefan; Rambau, Jörg; Tuchscherer, Andreas - In: Computational Statistics 79 (2014) 1, pp. 87-117
We computationally assess policies for the elevator control problem by a new column-generation approach for the linear programming method for discounted infinite-horizon Markov decision problems. By analyzing the optimality of given actions in given states, we were able to provably improve the...
Persistent link: https://www.econbiz.de/10010848012
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Computational bounds for elevator control policies by large scale linear programming
Heinz, Stefan; Rambau, Jörg; Tuchscherer, Andreas - In: Mathematical Methods of Operations Research 79 (2014) 1, pp. 87-117
We computationally assess policies for the elevator control problem by a new column-generation approach for the linear programming method for discounted infinite-horizon Markov decision problems. By analyzing the optimality of given actions in given states, we were able to provably improve the...
Persistent link: https://www.econbiz.de/10011000010
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COLUMN GENERATION APPROACH TO LINE PLANNING WITH VARIOUS HALTING PATTERNS — APPLICATION TO THE KOREAN HIGH-SPEED RAILWAY
PARK, BUM HWAN; SEO, YONG-IL; HONG, SUNG-PIL; RHO, HAG-LAE - In: Asia-Pacific Journal of Operational Research (APJOR) 30 (2013) 04, pp. 1350006-1
This study investigated railway line planning optimization models that determine the frequency of trains on each line to satisfy passenger origin–destination demands while minimizing related costs. Most line planning models assume that all trains on the same route run with the same halting...
Persistent link: https://www.econbiz.de/10011010810
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A branch and price algorithm for the minimum power multicasting problem in wireless sensor networks
Montemanni, R.; Leggieri, V. - In: Mathematical Methods of Operations Research 74 (2011) 3, pp. 327-342
The Minimum Power Multicast Problem arises in wireless sensor networks and consists in assigning a transmission power to each node of a network in such a way that the total power consumption over the network is minimized, while a source node is connected to a set of destination nodes, toward...
Persistent link: https://www.econbiz.de/10010949917
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Selective Gram–Schmidt orthonormalization for conic cutting surface algorithms
Mitchell, John; Basescu, Vasile - In: Mathematical Methods of Operations Research 67 (2008) 1, pp. 91-115
It is not straightforward to find a new feasible solution when several conic constraints are added to a conic optimization problem. Examples of conic constraints include semidefinite constraints and second order cone constraints. In this paper, a method to slightly modify the constraints is...
Persistent link: https://www.econbiz.de/10010949922
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Long-term staffing based on qualification profiles
Drexl, Andreas; Mundschenk, Martin - In: Mathematical Methods of Operations Research 68 (2008) 1, pp. 21-47
Manpower still is one of the most expensive resources, in spite of increasing automation. While employee scheduling and rostering has been the topic of extensive research over the past decades, usually it is assumed that the demand for staff is either given or can be obtained without difficulty....
Persistent link: https://www.econbiz.de/10010950267