scholarly journals A Rapid Search Method for Scheduling Delivery of Multiple Automated Guided Vehicles

2022 ◽  
Author(s):  
Koki Meno ◽  
Ayanori Yorozu ◽  
Akihisa Ohya
Keyword(s):  
Numerical Simulations ◽  
Search Method ◽  
Automated Guided Vehicles ◽  
Automated Guided Vehicle ◽  
Scheduling Problem ◽  
Two Dimensional ◽  
Dimensional Array ◽  
End Point ◽  
Transportation Scheduling ◽  
Transportation Schedule

Abstract In this study, a method was developed to address the automated guided vehicle (AGV) transportation scheduling problem. For deliveries in factories and warehouses, it is necessary to quickly plan a feasible transportation schedule without delay within a specified time. This study focused on obtaining a transport schedule without delay from the specified time while maintaining the search for a better solution during the execution of the transport task. Accordingly, a method was developed for constructing a solution with a two-dimensional array of delivery tasks for each AGV, arranged in the order in which they are executed, as well as for searching for a schedule by performing exchange and insertion operations. For the exchange and insertion, a method that considers the connectivity between the end point of a task and the start point of the next task was adopted. To verify the effectiveness of the proposed method, numerical simulations were performed assuming an actual transportation task.

scholarly journals An Integrated Production and Transportation Scheduling Method in Hybrid Flow Shop

2021 ◽  
Author(s):  
Wangming Li ◽  
Dong Han ◽  
Liang Gao ◽  
Xinyu LI ◽  
Yang Li
Keyword(s):  
Production Scheduling ◽  
Flow Shop ◽  
Automated Guided Vehicles ◽  
Flow Shop Scheduling ◽  
Smart Manufacturing ◽  
Hybrid Flow Shop ◽  
Scheduling Problem ◽  
Integrated Production ◽  
Hybrid Flow Shop Scheduling ◽  
Transportation Scheduling

Abstract The connection between production scheduling and transportation scheduling is getting closer in smart manufacturing system, both of which are summarized as NP-hard problems. However, only a few studies have considered them simultaneously. This paper studies the integrated production and transportation scheduling problem (IPTSP) in hybrid flow shop, which is an extension of the hybrid flow shop scheduling problem (HFSP). In this problem, the transfer tasks of jobs are performed by a certain number of automated guided vehicles (AGV). In addition to the production scheduling on machines, we consider the transportation scheduling on AGVs as the part of the optimization process. To solve it, we make some preparation (including the establishment of task pool, the new solution representation and the new solution evaluation), which can help algorithm efficiently find satisfactory solutions while appropriately limiting the search space. Then, an effective genetic tabu search algorithm is used to minimize the makespan. Finally, two groups of instances are designed and three types of experiments are conducted to evaluate the performance of proposed method. The results show that the proposed method can achieve good results, showing the effectiveness of the presented approach.

Introductory paper

1966 ◽  
Vol 24 ◽  
pp. 3-5
Author(s):  
W. W. Morgan
Keyword(s):  
Line Intensity ◽  
Classification Scheme ◽  
Two Dimensional ◽  
Spectral Classification ◽  
Dimensional Array ◽  
Rr Lyrae ◽  
Metallic Line ◽  
Introductory Paper ◽  
Parameter Varying ◽  
Definition Of

1. The definition of “normal” stars in spectral classification changes with time; at the time of the publication of theYerkes Spectral Atlasthe term “normal” was applied to stars whose spectra could be fitted smoothly into a two-dimensional array. Thus, at that time, weak-lined spectra (RR Lyrae and HD 140283) would have been considered peculiar. At the present time we would tend to classify such spectra as “normal”—in a more complicated classification scheme which would have a parameter varying with metallic-line intensity within a specific spectral subdivision.

Localized Defect Modes in a Two-Dimensional Array of Magnetic Nanodots

2013 ◽  
Author(s):  
Roman Verba ◽  
Vasil Tiberkevich ◽  
Elena Bankowski ◽  
Thomas Meitzler ◽  
Gennadiy Melkov ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Defect Modes ◽  
Dimensional Array ◽  
Magnetic Nanodots

scholarly journals Two dimensional array of MPPC and CsI(Tl) for radiation monitoring prototype

2021 ◽  
Vol 1106 (1) ◽  
pp. 012028
Author(s):  
A A Jasni ◽  
YS Yap ◽  
I H. Hashim ◽  
N E Ahmad ◽  
N Ramlee
Keyword(s):  
Radiation Monitoring ◽  
Two Dimensional ◽  
Dimensional Array

scholarly journals Towards explicit regulating-ion-transport: nanochannels with only function-elements at outer-surface

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Qun Ma ◽  
Yu Li ◽  
Rongsheng Wang ◽  
Hongquan Xu ◽  
Qiujiao Du ◽  
...  
Keyword(s):  
Ion Transport ◽  
Numerical Simulations ◽  
Power Density ◽  
Outer Surface ◽  
Internal Resistance ◽  
Porous Membranes ◽  
Two Dimensional ◽  
Ionic Selectivity ◽  
Key Features ◽  
Energy Conversion Devices

AbstractFunction elements (FE) are vital components of nanochannel-systems for artificially regulating ion transport. Conventionally, the FE at inner wall (FEIW) of nanochannel−systems are of concern owing to their recognized effect on the compression of ionic passageways. However, their properties are inexplicit or generally presumed from the properties of the FE at outer surface (FEOS), which will bring potential errors. Here, we show that the FEOS independently regulate ion transport in a nanochannel−system without FEIW. The numerical simulations, assigned the measured parameters of FEOS to the Poisson and Nernst-Planck (PNP) equations, are well fitted with the experiments, indicating the generally explicit regulating-ion-transport accomplished by FEOS without FEIW. Meanwhile, the FEOS fulfill the key features of the pervious nanochannel systems on regulating-ion-transport in osmotic energy conversion devices and biosensors, and show advantages to (1) promote power density through concentrating FE at outer surface, bringing increase of ionic selectivity but no obvious change in internal resistance; (2) accommodate probes or targets with size beyond the diameter of nanochannels. Nanochannel-systems with only FEOS of explicit properties provide a quantitative platform for studying substrate transport phenomena through nanoconfined space, including nanopores, nanochannels, nanopipettes, porous membranes and two-dimensional channels.

scholarly journals A two-dimensional array of single-hole quantum dots

2021 ◽  
Vol 118 (4) ◽  
pp. 044002
Author(s):  
F. van Riggelen ◽  
N. W. Hendrickx ◽  
W. I. L. Lawrie ◽  
M. Russ ◽  
A. Sammak ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Two Dimensional ◽  
Dimensional Array ◽  
Single Hole

ENCRYPTION-DECRYPTION TECHNIQUES FOR PICTURES

1989 ◽  
Vol 03 (03n04) ◽  
pp. 497-503
Author(s):  
RANI SIROMONEY ◽  
K. G. SUBRAMANIAN ◽  
P. J. ABISHA
Keyword(s):  
Public Key ◽  
Two Dimensional ◽  
Chain Code ◽  
Dimensional Array ◽  
Public Key Cryptosystems ◽  
Encryption Decryption ◽  
A Chain

Language theoretic public key cryptosystems for strings and pictures are discussed. Two methods of constructing public key cryptosystems for the safe transmission or storage of chain code pictures are presented; the first one encrypts a chain code picture as a string and the second one as a two-dimensional array.

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