Results 21 to 30 of about 71,717 (241)
A method for generating realistic correlation matrices [PDF]
, 2013 Simulating sample correlation matrices is important in many areas of statistics. Approaches such as generating Gaussian data and finding their sample correlation matrix or generating random uniform $[-1,1]$ deviates as pairwise correlations both have ...
Garcia, Stephan Ramon +2 more
core +5 more sources
Model Hub Median Problem Dengan Batasan Travel Time
Jurnal Teknik Industri, 2017 This article describes the development of an uncapacitated p-hub median problem model. The established model will be applied in determining the location of the hub.
Faisal Ibrahim, Ahmad Rusdiansyah
doaj +1 more source
A Hybrid Metaheuristic Algorithm for the Efficient Placement of UAVs
Algorithms, 2020 This work addresses the problem of using Unmanned Aerial Vehicles (UAV) to deploy a wireless aerial relay communications infrastructure for stations scattered on the ground.
Stephanie Alvarez Fernandez +2 more
doaj +1 more source
An empirical comparison of alternate regime-switching models for electricity spot prices [PDF]
, 2010 One of the most profound features of electricity spot prices are the price spikes. Markov regime-switching (MRS) models seem to be a natural candidate for modeling this spiky behavior.
Janczura, Joanna, Weron, Rafal
core +3 more sources
Designing Hub-and-Spoke School Bus Transportation Network: A Case Study of Wonkwang University
Promet (Zagreb), 2012 This paper provides a case study of hub-and-spoke school bus transportation network design. The case study here utilizes a mathematical model that is the P-median optimization model to determine optimal hub locations.
Jun-Hyuk Kim, Soonhu Soh
doaj +1 more source
A Multimodal Passenger-and-Package Sharing Network for Urban Logistics
Journal of Advanced Transportation, 2020 This paper envisions a multimodal passenger-and-package sharing (PPS) network for urban logistics integrating metro, taxi, and truck. A hub-and-spoke structure is designed including hubs located at metro stations and service stores connected to the hubs.
Yuxiong Ji +4 more
doaj +1 more source
An Approximation Algorithm for the p-Hub Median Problem
Electronic Notes in Discrete Mathematics, 2017 Abstract In the p-hub median problem we are given a set of clients V, a set of demands D ⊆ V × V , a cost function ρ : V × V → R + , and an integer p > 0 . The objective is to select terminals T ⊆ V , where | T | ≤ p , and assign each demand to a terminal, in order to minimize the total cost between ...
Camile Frazão Bordini +1 more
openaire +1 more source
Journal of Industrial Engineering International, 2018 A new multi-objective intermodal hub-location-allocation problem is modeled in this paper in which both the origin and the destination hub facilities are modeled as an M/M/m queuing system.
Mahdi Rashidi Kahag +3 more
doaj +1 more source
Can Cascades be Predicted? [PDF]
, 2014 On many social networking web sites such as Facebook and Twitter, resharing or reposting functionality allows users to share others' content with their own friends or followers.
Adamic, Lada A. +4 more
core +2 more sources
Rapid Circumstellar Disk Evolution and an Accelerating Star Formation Rate in the Infrared Dark Cloud M17 SWex [PDF]
, 2016 We present a catalog of 840 X-ray sources and first results from a 100 ks Chandra X-ray Observatory imaging study of the filamentary infrared dark cloud G014.225$-$00.506, which forms the central regions of a larger cloud complex known as the M17 ...
Broos, Patrick S. +7 more
core +2 more sources