scholarly journals A Geometrical Structure-Based New Approach for City Logistics System Planning with Cargo Bikes and Its Application for the Shopping Malls of Budapest

2021 ◽  
Vol 11 (8) ◽  
pp. 3300
Author(s):  
Dávid Lajos Sárdi ◽  
Krisztián Bóna
Keyword(s):  
Graph Theory ◽  
Geometrical Structure ◽  
Smart Cities ◽  
Geometric Model ◽  
Geometrical Model ◽  
City Logistics ◽  
Shopping Malls ◽  
Logistics System ◽  
New Approach ◽  
Logistics Network

Nowadays, cargo bikes are seeing an ever-greater role in city logistics with an increasing number of deliveries, and it is essential to examine their future role in green and smart cities. In our work, we examine the application of cargo bikes in the city logistics system of the urban concentrated sets of delivery locations, focusing first on shopping malls, with the investigation of the geometrical structure of the logistics network. In the examined concept, the use of cargo bikes will be combined with electric trucks to make possible green deliveries of urban concentrated sets of delivery locations. In this paper, we present the experiences of the existing systems and the related research, the simulation model of the examined new concept with cargo bikes and its results, the graph theory-based geometric model of the examined city logistics system with graph theory-based notation, and the application of the new approach for Budapest. The main output of this research is the geometrical model of the urban concentrated sets of delivery locations and its application. Based on this geometrical model, it will be possible to decide about the suitability of the examined cargo bike-based city logistics concepts for given cities.

scholarly journals Mathematical Modelling of the Cost Structure of the Logistics System of Shopping Malls in Budapest

2018 ◽  
Vol 46 (3) ◽  
pp. 142-150
Author(s):  
Krisztián Bóna ◽  
Ádám Róka ◽  
Dávid Lajos Sárdi
Keyword(s):  
Mathematical Modelling ◽  
Point Of View ◽  
Cost Structure ◽  
City Logistics ◽  
Shopping Malls ◽  
Physical Processes ◽  
Logistics System ◽  
The Cost ◽  
The Mathematical Model ◽  
The City

In this paper, we will present the examination of the city logistics system of shopping malls in Budapest. We will introduce the mathematical model of its cost structure which can help us to evaluate this complex system from a financial point of view. The data, we collected earlier, made it possible to simulate the physical processes of the current logistics system and to compare them with innovative new systems as well. However, in case of any new systems it is essential to compare the costs too. The mathematical modelling was based on the observed processes of three shopping malls in Budapest. We added this cost structure to the simulation model to make the simulation of costs possible, so now we have a tool which can help us comprehensively examine the current logistic system of the shopping malls in Budapest as well as a consolidation based proposed solution.

scholarly journals Controllability and Observability of a Large Scale Thermodynamical System via Connectability Approach

2010 ◽  
Author(s):  
Virdiansyah Permana ◽  
Rahmat Shoureshi
Keyword(s):  
Graph Theory ◽  
Lie Algebra ◽  
Large Scale ◽  
Point Of View ◽  
Rank Condition ◽  
Computational Point ◽  
New Approach ◽  
Class System ◽  
Necessary And Sufficient ◽  
Controllability And Observability

This study presents a new approach to determine the controllability and observability of a large scale nonlinear dynamic thermal system using graph-theory. The novelty of this method is in adapting graph theory for nonlinear class and establishing a graphic condition that describes the necessary and sufficient terms for a nonlinear class system to be controllable and observable, which equivalents to the analytical method of Lie algebra rank condition. The directed graph (digraph) is utilized to model the system, and the rule of its adaptation in nonlinear class is defined. Subsequently, necessary and sufficient terms to achieve controllability and observability condition are investigated through the structural property of a digraph called connectability. It will be shown that the connectability condition between input and states, as well as output and states of a nonlinear system are equivalent to Lie-algebra rank condition (LARC). This approach has been proven to be easier from a computational point of view and is thus found to be useful when dealing with a large system.

The two-echelon city logistics system with on-street satellites

2020 ◽  
Vol 139 ◽  
pp. 105577 ◽  
Author(s):  
Hongqi Li ◽  
Yinying Liu ◽  
Kaihang Chen ◽  
Qingfeng Lin
Keyword(s):  
City Logistics ◽  
Logistics System

scholarly journals A Novel Hybrid Algorithm for Multiobjective Location-Allocation Problem in Emergency Logistics

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Hongrui Chu ◽  
Yahong Chen
Keyword(s):  
Optimization Model ◽  
Complex Model ◽  
Theory And Practice ◽  
Logistics System ◽  
Logistics Network ◽  
Location Allocation ◽  
Emergency Logistics ◽  
Ga Algorithm ◽  
Relief Distribution ◽  
Deprivation Costs

Increased frequency of disasters keeps reminding us of the importance of effective resource distribution in postdisaster. To reduce the suffering of victims, this paper focuses on how to establish an effective emergency logistics system. We first propose a multiobjective optimization model in which the location and allocation decisions are made for a three-level logistics network. Three objectives, deprivation costs, unsatisfied demand costs, and logistics cost, are adopted in the proposed optimization model. Several cardinality and flow balance constraints are considered simultaneously. Then, we design a novel effective IFA-GA algorithm by combining the firefly algorithm and genetic algorithm to solve this complex model effectively. Furthermore, three schemes are proposed to improve the effectiveness of the IFA-GA algorithm. Finally, the numerical results provide several insights on the theory and practice of relief distribution, which also illustrate the validity of the proposed solution algorithm.

scholarly journals A geometrical model for the evolution of spherical planetary nebulae based on thin-shell formalism

2021 ◽  
pp. 2150191
Author(s):  
Ibrahim Gullu ◽  
S. Habib Mazharimousavi ◽  
S. Danial Forghani
Keyword(s):  
Energy Density ◽  
Planetary Nebula ◽  
Thin Shell ◽  
Energy Momentum Tensor ◽  
Geometric Model ◽  
Geometrical Model ◽  
Momentum Tensor ◽  
Evolution Pattern ◽  
Simple Power Function ◽  
Curvature Tensors

A spherical planetary nebula is described as a geometric model. The nebula itself is considered as a thin-shell, which is visualized as a boundary of two spacetimes. The inner and outer curvature tensors of the thin-shell are found in order to get an expression of the energy-momentum tensor on the thin-shell. The energy density and pressure expressions are derived using the energy-momentum tensor. The time evolution of the radius of the thin-shell is obtained in terms of the energy density. The model is tested by using a simple power function for decreasing energy density and the evolution pattern of the planetary nebula is attained.

scholarly journals A New Technique to Solve the Instant Insanity Problem

2016 ◽  
Vol 11 (10) ◽  
pp. 5766-5773
Author(s):  
Salar Y Alsardary ◽  
Hwee Jung Kim ◽  
Julie George
Keyword(s):  
Graph Theory ◽  
Programming Language ◽  
New Technique ◽  
New Approach ◽  
A New Technique

Instant Insanity [1] consists of four cubes, each of whose six faces are colored with one of the four colors: red, blue, white, and green. The object is to stack the cubes in such a way that each of the four colors appears on each side of the resulting column. See figure 1 below[2]. Traditionally, this could be solved using graph theory.However, in this article, we introduce a new technique to solve the problem without using graph theory. We also used a Perl programming language to implement the new approach for the Instant Insanity.

STRATEGIC MANAGEMENT OF LOGISTICS ACTIVITY IN POULTRY ENTERPRISES

2018 ◽  
Author(s):  
Viktoriia Zhmudenko ◽  
◽  
Lyudmyla Dlugoborska ◽  
Keyword(s):  
Supply Chain ◽  
Optimal Transport ◽  
Regional Distribution ◽  
Distribution Centers ◽  
Logistics System ◽  
Logistics Network ◽  
Poultry Products ◽  
Distribution Logistics ◽  
Enterprise Logistics ◽  
Logistics Activity

The article considers the strategic guidelines of the logistics activities of poultry enterprises. It is noted that the strategies of minimizing logistics costs and investing in the logistics network, maximizing and improving logistics services, maximizing income and profits, increasing the competitive advantages of the enterprise, logistics outsourcing are the most widely used logistics strategies. It is proved that the purpose of creating a logistics system is to harmonize the interests of producers, suppliers and consumers. It is established that an important factor in improving the strategic activities of the enterprise is the introduction of the principles of distribution logistics. This concept involves the use of a systematic approach and integrated planning, as well as management of the entire flow of feed, materials, breeding and commercial poultry products in various areas from suppliers, through manufacturers of breeding and breeding products, distribution centers, to the final individual and corporate consumers of poultry products. The main stages of the business process of integration of a poultry enterprise in the supply chain are schematically shown. The necessity of introduction of new, more progressive forms of service in the process of goods movement can be achieved. The need to use regional distribution centers of poultry enterprises in the supply chain, which will significantly reduce the cost of delivery of their products through the formation of optimal transport batches of products from different manufacturers, its packaging and labeling.

Framework Proposition Strategy for Collection of Returned Products in Reverse Logistics Environment

2020 ◽  
pp. 462-475
Author(s):  
Hendrik Lamsali
Keyword(s):  
Decision Making ◽  
Sustainable Development ◽  
Reverse Logistics ◽  
Future Research ◽  
Research Development ◽  
Logistics System ◽  
Logistics Network ◽  
Plastics Recycling ◽  
Product Return ◽  
Development Goals

The importance of reverse logistics and product recovery is evident in various industries as well as in current UNESCO sustainable development goals. This includes plastics and recycling with the former “contributed” significantly towards environmental issues and the latter being one of the primary solutions. The motivations of its implementation are generally divided into legal, economic, and socio-environmental factors. One of the crucial components of plastics recycling and a reverse logistics system is product return channels. The success of other components especially the recovery operations depends on the effectiveness of the return channels. Although numerous investigations on product return channels have been carried out, research on some critical aspects remains wanting. This study presents a review that highlights this deficiency, depicts relevant research development on product return channels, decision-making issues, and direction for future research. At the end of the study, the authors propose a new closed-loop logistics network and future research framework propositions.

scholarly journals Risk Propagation Model and Its Simulation of Emergency Logistics Network Based on Material Reliability

2019 ◽  
Vol 16 (23) ◽  
pp. 4677 ◽  
Author(s):  
Tinggui Chen ◽  
Shiwen Wu ◽  
Jianjun Yang ◽  
Guodong Cong
Keyword(s):  
Complex Network ◽  
Network Theory ◽  
Economic Life ◽  
Propagation Model ◽  
Propagation Mechanism ◽  
Scheduling Problems ◽  
Logistics System ◽  
Complex Network Theory ◽  
Logistics Network ◽  
Emergency Logistics

Emergency logistics plays an important role in the rescue process after sudden disasters. However, in the process of emergency logistics activities, risks may arise due to scheduling problems or insufficient supply of warehouse stocks, resulting in an insufficient rescue capacity. In addition, the risk of emergency logistics is random and may exist in a certain link or throughout the whole rescue process of emergency logistics. Consequently, the disaster site may be invaded by sudden disaster risk due to the lack of necessary material supplies. The entire emergency logistics system may be destroyed and cause even greater losses as well. Based on this phenomenon, this paper introduces reliability factors of materials and combines the complex network theory to build an emergency logistics network and analyze the emergency logistics risk propagation mechanism. This paper firstly builds an emergency logistics network based on complex network theory. Then, it combines the improved epidemic model to analyze the influencing factors of risk propagation in the emergency logistics network. Finally, this paper probes into the emergency logistics risk propagation mechanisms and processes in terms of network type, material reliability, rescue speed, etc. Furthermore, this paper identifies key factors for risk control and proposes countermeasures to further spread risks, thereby reducing the risk to loss of economic life.

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