Results 41 to 50 of about 8,135 (227)

Daily Planning for Three Echelon Logistics Considering Inventory Conditions

open access: yesJournal of Advanced Mechanical Design, Systems, and Manufacturing, 2013
Under recent global competition and short product life cycle, we need to undertake agile decision making in every manufacturing process. With this point of view, this study provides a practical hybrid meta-heuristic method for a three echelon logistic ...
Yoshiaki SHIMIZU, Dicky FATRIAS
doaj   +1 more source

Exploiting sets of independent moves in VRP

open access: yesEURO Journal on Transportation and Logistics, 2018
Most heuristic methods for VRP and its variants are based on the partial exploration of large neighborhoods, typically by means of single, simple moves applied to the current solution. In this paper we define an extended concept of independent moves and show how even a very standard heuristic method can significantly improve when considering the ...
Tommaso Bianconcini   +4 more
openaire   +2 more sources

An improved model for estimating optimal VRP solution values

open access: yes, 2023
Since it is computationally expensive to solve the vehicle routing problem (VRP) optimally, as this problem is NP-hard, in this technical note we study how to accurately approximate the optimal VRP tour length.
Bertazzi L., Kou S., Golden B.
core   +1 more source

Instances for the VRP with Occasional Drivers and Time Windows

open access: yes, 2022
Instances for the VRP with Occasional Drivers and Time ...
Mancini, S
core   +2 more sources

Fundamental Challenges, Physical Implementations, and Integration Strategies for Ising Machines in Large‐Scale Optimization Tasks

open access: yesAdvanced Electronic Materials, EarlyView.
Ising machines are emerging as specialized hardware solvers for computationally hard optimization problems. This review examines five major platforms—digital CMOS, analog CMOS, emerging devices, coherent optics, and quantum systems—highlighting physics‐rooted advantages and shared bottlenecks in scalability and connectivity.
Hyunjun Lee, Joon Pyo Kim, Sanghyeon Kim
wiley   +1 more source

VRP Expression of SARS S and N and VRP-S Induction of Anti-SARS S Antibody

open access: yes, 2013
(A) Western blot of cell lysates infected with VRP-S or VRP-N and probed with human serum collected from a convalescent SARS patient, 1128. (B–D) Western blot of lysates from cells infected with the SARS-CoV strains
Ralph Baric (29228)   +14 more
core   +1 more source

Multiscale Perspectives on Perovskite Instability: From Atomistic Deformation to Device Degradation in Perovskite Solar Cells

open access: yesAdvanced Energy Materials, EarlyView.
Multiscale perspectives on how excess charges in soft lead halide perovskites induce operational instability in photovoltaic devices are presented. Localized carriers formed under thermodynamic non‐equilibrium states modify atomistic interactions and drive lattice distortions, accelerating device degradation.
Joo‐Hong Lee   +6 more
wiley   +1 more source

Operations Research‐Based Formalisation and Design of Sustainable Reverse Logistics for E‐Waste Supply Chains

open access: yesBusiness Strategy and the Environment, EarlyView.
ABSTRACT This study demonstrates how a profitable, lean, and environmentally responsible e‐waste reverse logistics system can be designed using integrated Operations Research (OR) techniques. Addressing the growing urgency of responsible consumption (UN SDG 12) and the projected rise of the e‐waste sector to USD 137.60 billion by 2029, the research ...
Sheeba Pathak, Hajar Fatorachian
wiley   +1 more source

Numerical and experimental study on P‐wave propagation across a rock joint with different orientations

open access: yesDeep Underground Science and Engineering, EarlyView.
Joint orientation significantly affects P‐wave velocity, with the highest velocity at zero‐degree angles, decreasing to 30° as the angle increases. The velocity increases slightly from 30 to 45 degrees but sharply decreases from 45 to 90 degrees. Abstract Determination of the required parameters in different science contexts using the ultrasonic wave ...
Yaghoob Zarei   +4 more
wiley   +1 more source

Kinetics of VRP-N–Associated Inflammation

open access: yes, 2013
Light photomicrographs of lung sections taken from VRP-HA– and VRP-N–vaccinated mice harvested at days 2, 4, 7, and 14 post–icSARS-CoV challenge (Table 1, experiment 5).
Ralph Baric (29228)   +14 more
core   +1 more source

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