scholarly journals Building Robust Closed-Loop Supply Networks against Malicious Attacks

Processes ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 39
Author(s):  
Ding-Shan Deng ◽  
Wei Long ◽  
Yan-Yan Li ◽  
Xiao-Qiu Shi
Keyword(s):  
Evolutionary Algorithm ◽  
Reverse Logistics ◽  
Closed Loop ◽  
Reverse Flow ◽  
Frame Of Reference ◽  
Malicious Attacks ◽  
Supply Networks ◽  
Forward Logistics ◽  
Simulation Results ◽  
Structural Perspective

With recent industrial upgrades, it is essential to transform the current forward supply networks (FSNs) into closed-loop supply networks (CLSNs), which are formed by the integration of forward and reverse logistics. The method chosen in this paper for building reverse logistics is to add additional functions to the existing forward logistics. This process can be regarded as adding reverse edges to the original directed edges in an FSN. Due to the limitation of funds and the demand for reverse flow, we suppose that a limited number of reverse edges can be built in a CLSN. To determine the transformation schemes with excellent robustness against malicious attacks, this paper proposes a multi-population evolutionary algorithm with novel operators to optimize the robustness of the CLSN, and this algorithm is abbreviated as MPEA-RSN. Then, both the generated and realistic SNs are taken as examples to validate the effectiveness of MPEA-RSN. The simulation results show that the index R, introduced to evaluate the robustness of CLSNs, can be improved by more than 95%, and this indicates that (1) the different schemes for adding reverse routes to an FSN can lead to different robustness values, and (2) the robustness of the transformed CLSN to malicious attacks can be significantly improved after optimization by MPEA-RSN. When an FSN is to be transformed into a CLSN, this paper can provide a frame of reference for building a CLSN that is robust to malicious attacks from a network structural perspective.

Reverse Logistics

2020 ◽  
Author(s):  
Haozhe Chen ◽  
Lisa Cotter
Keyword(s):  
Best Practices ◽  
Reverse Logistics ◽  
Closed Loop ◽  
Economic Value ◽  
Future Research ◽  
Research Topics ◽  
Value Recovery ◽  
Forward Logistics ◽  
The Status ◽  
Definition Of

As more companies are engaging in reverse logistics activities, it is imperative to develop a better understanding of this important concept. This chapter covers fundamental issues related to reverse logistics. After introducing a definition of reverse logistics, a discussion is provided on its importance and contrasts with forward logistics. Returns reduction, closed-loop supply chain, and circular economy are identified as important topics related to reverse logistics. Examples are then used to explain the economic value recovery as well as the strategic and operational value of reverse logistics. After delineating the key processes in reverse logistics, this chapter identifies reverse logistics challenges and best practices. Last, the status of reverse logistics research is discussed along with a list of future research topics.

Research on the Double Source Stock Control for a Manufacturer Based on EPR

2014 ◽  
Vol 962-965 ◽  
pp. 3071-3075
Author(s):  
Li Wei Xu ◽  
Fu Cai Wan ◽  
Yu E Fan
Keyword(s):  
Supply Chain ◽  
Reverse Logistics ◽  
Closed Loop ◽  
Closed Loop Supply Chain ◽  
Business Decisions ◽  
Economic Production Quantity ◽  
Economic Production ◽  
Forward Logistics ◽  
Production Quantity ◽  
Production Period

With the widely acception of extended producer responsibility system, reverse logistics has attracted more and more attention. For manufacturers, reverse logistics activities is not inseparable to the general forward logistics, and they constitute the closed-loop supply chain. Decision makers of enterprises need to control the new products inventory and the recovered materials inventory to make the enterprises get the maximum profit.In this paper,the inventory characteristics under the closed-loop supply chain be analyzed and a inventory model for a single repair period, many production period is proposed .On condition that the number of recovery is controlled by the recycling price and is equal in different cycles,the recovered products can be sold as new.A economic production quantity and recycling price can be solved to make the total cost of a single cycle lowest ,which provides a basis for business decisions.

scholarly journals Robustness of Cyber-Physical Supply Networks in Cascading Failures

Entropy ◽  
2021 ◽  
Vol 23 (6) ◽  
pp. 769
Author(s):  
Dong Mu ◽  
Xiongping Yue ◽  
Huanyu Ren
Keyword(s):  
Load Distribution ◽  
Cascading Failure ◽  
Cascading Failures ◽  
Supply Network ◽  
Supply Networks ◽  
Defense Strategies ◽  
Critical Thresholds ◽  
Network Load ◽  
Physical Node ◽  
Simulation Results

A cyber-physical supply network is composed of an undirected cyber supply network and a directed physical supply network. Such interdependence among firms increases efficiency but creates more vulnerabilities. The adverse effects of any failure can be amplified and propagated throughout the network. This paper aimed at investigating the robustness of the cyber-physical supply network against cascading failures. Considering that the cascading failure is triggered by overloading in the cyber supply network and is provoked by underload in the physical supply network, a realistic cascading model for cyber-physical supply networks is proposed. We conducted a numerical simulation under cyber node and physical node failure with varying parameters. The simulation results demonstrated that there are critical thresholds for both firm’s capacities, which can determine whether capacity expansion is helpful; there is also a cascade window for network load distribution, which can determine the cascading failures occurrence and scale. Our work may be beneficial for developing cascade control and defense strategies in cyber-physical supply networks.

Femtosecond pulse compression using the Z-scan technique and closed-loop evolutionary algorithm

2005 ◽  
Vol 98 (8) ◽  
pp. 083521 ◽  
Author(s):  
D. L. Silva ◽  
I. Guedes ◽  
S. C. Zilio ◽  
L. Misoguti ◽  
C. R. Mendonça
Keyword(s):  
Evolutionary Algorithm ◽  
Femtosecond Pulse ◽  
Pulse Compression ◽  
Closed Loop

Nonlinear Control of Semi-Active MacPherson Suspension System

2012 ◽  
Author(s):  
Olugbenga M. Anubi ◽  
Carl D. Crane
Keyword(s):  
Closed Loop ◽  
Control Design ◽  
Mr Damper ◽  
Suspension System ◽  
Time Domain Simulation ◽  
Closed Loop System ◽  
Output Feedback Controller ◽  
Space Frequency ◽  
Simulation Results ◽  
Active Damper

This paper presents the control design and analysis of a non-linear model of a MacPherson suspension system equipped with a magnetorheological (MR) damper. The model suspension considered incorporates the kinematics of the suspension linkages. An output feedback controller is developed using an ℒ2-gain analysis based on the concept of energy dissipation. The controller is effectively a smooth saturated PID. The performance of the closed-loop system is compared with a purely passive MacPherson suspension system and a semi-active damper, whose damping coefficient is tunned by a Skyhook-Acceleration Driven Damping (SH-ADD) method. Simulation results show that the developed controller outperforms the passive case at both the rattle space, tire hop frequencies and the SH-ADD at tire hop frequency while showing a close performance to the SH-ADD at the rattle space frequency. Time domain simulation results confirmed that the control strategy satisfies the dissipative constraint.

Product Resynthesis as a Reverse Logistics Strategy for an Optimal Closed-Loop Supply Chain

2013 ◽  
Author(s):  
Chinmay Sane ◽  
Conrad S. Tucker
Keyword(s):  
Supply Chain ◽  
Reverse Logistics ◽  
Closed Loop ◽  
Manufacturing Firms ◽  
Third Party ◽  
High Tech ◽  
Closed Loop Supply Chain ◽  
Supply Chain Strategy ◽  
Logistics Strategy ◽  
Original Product

With continued emphasis on sustainability-driven design, reverse logistics is emerging as a vital competitive supply chain strategy for many of the global high-tech manufacturing firms. Various original equipment manufacturers (OEMs) and multi-product manufacturing firms are enhancing their reverse logistics strategies in order to establish an optimal closed-loop supply chain through which they can introduce refurbished variants of their products back into the market. While a refurbished product strategy helps to mitigate environmental impact challenges as well as provide additional economic benefits, it is limited to an existing product market, possibly a subset of the existing market, and fails to commercialize/target new markets. In addition to refurbishing, the alternatives available for utilizing End-Of-Life (EOL) products are currently restricted to recycling and permanent disposal. In this work, the authors propose employing a new EOL option called “resynthesis” that utilizes existing waste from EOL products in a novel way. This is achieved through the synthesis of assemblies/subassemblies across multiple domains. The “newly” synthesized product can then be incorporated into the dynamics of a closed-loop supply chain. The proposed methodology enables OEMs to not only offer refurbished products as part of their reverse logistics strategy, but also provide them with resynthesized product concepts that can be used to expand to new/emerging markets. The proposed methodology provides a general framework that includes OEMs (manufacturers of the original product), retailers (distributors of the original product and collectors of the EOL products) and third-party firms (managers of the EOL products) as part of a closed-loop supply chain strategy. The proposed methodology is compared with the existing methodologies in the literature wherein a third-party supplies the OEM only with refurbished products and supplies products unsuitable for refurbishing to another firm(s) for recycling/disposal. A case study involving a multi-product electronics manufacturer is presented to demonstrate the feasibility of the proposed methodology.

Robust Steering and Differential Braking Control for Automated Guidance of Tractor-Semitrailer Combination Vehicles

2000 ◽  
Author(s):  
Jeng-Yu Wang ◽  
Masayoshi Tomizuka
Keyword(s):  
Rear Axle ◽  
Closed Loop ◽  
Transient Responses ◽  
Model Uncertainties ◽  
Yaw Stability ◽  
Angular Velocities ◽  
Simulation Results ◽  
Braking Control ◽  
Line Pressure ◽  
Lateral Error

Abstract In this paper, a robust linear steering and differential braking controller is designed for the automated guidance of tractor-semitrailer combination vehicles using the H∞ loop-shaping methodology. Only the articulation angle, the lateral errors at the front and rear axle of the tractor, and the angular velocities of the rear wheels of the trailer or the brake line pressure signals, are assumed to be available for the synthesis of control inputs. The controller is designed to ensure the robustness to model uncertainties due to variations in vehicle longitudinal speed, road adhesion coefficient and trailer cargo load. Closed-loop simulation results show the robustness of the proposed controller and the resulting smaller lateral error at the trailer end when compared to the controller using the steering input only. More damped transient responses of articulation angle when using the steering and braking control also improve the yaw stability of the trailer.

SET STABILIZATION OF A MODIFIED CHUA'S CIRCUIT

2005 ◽  
Vol 15 (02) ◽  
pp. 567-604 ◽  
Author(s):  
SHIHUA LI ◽  
YU-PING TIAN
Keyword(s):  
Equilibrium Point ◽  
Lyapunov Stability ◽  
Closed Loop ◽  
Invariant Set ◽  
Linear Feedback ◽  
Chua’S Circuit ◽  
Chua's Circuit ◽  
Linear Feedback Controller ◽  
Simulation Results ◽  
First Time

In this paper, we develop a simple linear feedback controller, which employs only one of the states of the system, to stabilize the modified Chua's circuit to an invariant set which consists of its nontrivial equilibria. Moreover, we show for the first time that the closed loop modified Chua's circuit satisfies set stability which can be considered as a generalization of common Lyapunov stability of an equilibrium point. Simulation results are presented to verify our method.

scholarly journals Prioritizing the Solutions to Reverse Logistics Barriers for the E-Commerce Industry in Pakistan Based on a Fuzzy AHP-TOPSIS Approach

2021 ◽  
Vol 13 (22) ◽  
pp. 12743
Author(s):  
Muhammad Hamza Naseem ◽  
Jiaqi Yang ◽  
Ziquan Xiang
Keyword(s):  
Supply Chain ◽  
Literature Review ◽  
Reverse Logistics ◽  
Fuzzy Ahp ◽  
Pairwise Comparison ◽  
Fuzzy Topsis ◽  
Extensive Literature ◽  
Forward Logistics ◽  
Reverse Logistics Management ◽  
Topsis Approach

In the past few years, reverse logistics practices have successfully managed to gain more attention in various industries and among supply chain researchers and experts. This is due to globalization, environmental concerns, and customer requirements, which have asserted industries’ concerns for reverse logistics management. In E-commerce, the process of reverse logistics originates with parcel refusal, undelivered goods, and exchanges. In developing countries like Pakistan, the adoption and implications of reverse logistics are still at their early stages. E-commerce companies give more attention to forward logistics and ignore logistics’ upstream flow in the supply chain. This study aims to identify, as well as list, the barriers and obtain the solutions to those identified barriers, and rank the barriers and their solutions so that logisticians and experts can solve them as per their priority. From the extensive literature review and experts’ opinions, we have found 14 barriers in implementing effective reverse logistics. Eight solutions to those barriers were also found from the literature review. This paper proposed the methodology based on fuzzy analytical hierarchy process (fuzzy-AHP), which used to get the weights of each barrier by using pairwise comparison, and fuzzy technique for order performance by similarity to ideal solution (fuzzy-TOPSIS) method, which was adopted for the final ranking of solutions to reverse logistics. The case of the Pakistan E-commerce industry is used in the proposed method.

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