Results 11 to 20 of about 3,036 (205)

Multiple quay cranes scheduling for double cycling in container terminals. [PDF]

open access: yesPLoS ONE, 2017
Double cycling is an efficient tool to increase the efficiency of quay crane (QC) in container terminals. In this paper, an optimization model for double cycling is developed to optimize the operation sequence of multiple QCs.
Yanling Chu   +2 more
doaj   +1 more source

Gate Sizing by Lagrangian Relaxation Revisited [PDF]

open access: yesIEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems, 2007
In this paper, we formulate the generalized convex sizing (GCS) problem that unifies the sizing problems and applies to sequential circuits with clock-skew optimization. We revisit the approach to solve the sizing problem by Lagrangian relaxation, point out several misunderstandings in the previous paper, and extend the approach to handle general ...
Jia Wang 0003   +2 more
openaire   +1 more source

On Lagrangian Relaxation of Quadratic Matrix Constraints [PDF]

open access: yesSIAM Journal on Matrix Analysis and Applications, 2000
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Kurt M. Anstreicher, Henry Wolkowicz
openaire   +2 more sources

A Lagrangian Relaxation for Golomb Rulers [PDF]

open access: yes, 2013
The Golomb Ruler Problem asks to position n integer marks on a ruler such that all pairwise distances between the marks are distinct and the ruler has minimum total length. It is a very challenging combinatorial problem, and provably optimal rulers are only known for n up to 26.
Marla R. Slusky, Willem Jan van Hoeve
openaire   +1 more source

Two lagrangian relaxation based heuristics for vertex coloring problem

open access: yesCumhuriyet Science Journal, 2020
Vertex coloring problem is a well-known NP-Hard problem where the objective is to minimize the number of colors used to color vertices of a graph ensuring that adjacent vertices cannot have same color.
Ali İrfan Mahmutoğulları
doaj   +1 more source

Deep Reinforcement Learning Under Signal Temporal Logic Constraints Using Lagrangian Relaxation

open access: yesIEEE Access, 2022
Deep reinforcement learning (DRL) has attracted much attention as an approach to solve optimal control problems without mathematical models of systems. On the other hand, in general, constraints may be imposed on optimal control problems.
Junya Ikemoto, Toshimitsu Ushio
doaj   +1 more source

A revisit to floorplan optimization by Lagrangian relaxation [PDF]

open access: yesProceedings of the 2006 IEEE/ACM international conference on Computer-aided design - ICCAD '06, 2006
With the advent of deep sub-micron (DSM) era, floorplanning has become increasingly important in physical design process. In this paper we clarify a misunderstanding in using Lagrangian relaxation for the minimum area floorplanning problem. We show that the problem is not convex and its optimal solution cannot be obtained by solving its Lagrangian dual
Chuan Lin, Hai Zhou, Chris Chu
openaire   +1 more source

An integrated model for aircraft routing and crew scheduling: Lagrangian Relaxation and metaheuristic algorithm

open access: yesWPOM : Working Papers on Operations Management, 2020
Airline optimization is a significant problem in recent researches and airline industrial as it can determine the level of service, profit and competition status of the airline.
Masoumeh Mirjafari   +2 more
doaj   +1 more source

Incremental Lagrangian Relaxation Based Discrete Gate Sizing and Threshold Voltage Assignment

open access: yesTechnologies, 2021
Timing closure remains one of the most critical challenges of a physical synthesis flow, especially when the design operates under multiple operating conditions.
Dimitrios Mangiras   +1 more
doaj   +1 more source

An Optimization-Based Orchestrator for Resource Access and Operation Management in Sliced 5G Core Networks

open access: yesSensors, 2021
Network slicing is a promising technology that network operators can deploy the services by slices with heterogeneous quality of service (QoS) requirements.
Chiu-Han Hsiao   +6 more
doaj   +1 more source

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