Gao Tiegang

One-way hash function based on hyper-chaotic cellular neural network

The design of an efficient one-way hash function with good performance is a hot spot in modern cryptography researches. In this paper, a hash function construction method based on cell neural network with hyper-chaos characteristics is proposed. First, the chaos sequence is gotten by iterating cellular neural network with Runge?Kutta algorithm, and then the chaos sequence is iterated with the message. The hash code is obtained through the corresponding transform of the latter chaos sequence. Simulation and analysis demonstrate that the new method has the merit of convenience, high sensitivity to initial values, good hash performance, especially the strong stability.

System dynamics analysis of RFID-EPC's impact on reverse supply chain

RFID-EPC plays an important role in Internet of Things which will be the new environment of application of the reverse supply chain. By using RFID-EPC, the reverse supply chain under Internet of Things will have some characteristics. In order to analyze the impacts of RFID-EPC on reverse supply chain, on the assumption that RFID-EPC can reduce the collection uncertainty of the used-products, we present a system dynamics model and show the changing of the inventories, the service levels, and the profits. By analyzing the simulation results of the reverse supply chain with and without RFID-EPC, we can obtain that the service levels and the profits of the collector, the disassembly center, and the remanufacturer will increase even though their inventories increase when RFID-EPC is used in reverse supply chain.

Pricing decisions for reverse supply chains

Purpose – The purpose of this paper is to present the collecting price decisions of used products in reverse supply chains based on the following cases: manufacturer for collecting and processing, third party for collecting and manufacturer for processing, retailer for collecting and manufacture for processing, and third party for collecting and processing.Design/methodology/approach – The paper considers a recycling channel whereby a manufacturer collects and processes the used products or delegates collecting (or processing) to the retailer or a third party; characterizes the steps of processing a returned used product; gives a collection function of used products which is an increasing function of the collecting price, since the quantity of returned used products is affected by the end customers willingness and the end customers willingness is affected by the collecting price. The optimal results were obtained by game theory.Findings – By investigating the pricing decisions for different cases, the m...

Finite-time control of chaotic systems with nonlinear inputs

A finite-time controller is designed for a class of nonlinear systems subject to sector nonlinear inputs. A novel and simple approach is suggested based on the finite-time control principle. The designed sliding-mode controller can drive a chaotic system to track a smooth target signal in a finite time. The chaotic Duffing–Holmes oscillator is used for verification and demonstration.

A Verifiable Copyright-Proving Scheme Based on Lifting Wavelet Transformation

In this paper, a verifiable copyright-proving scheme based on lifting wavelet transformation is proposed. Our scheme uses lifting wavelet transform (LWT) and chaotic system on the protected image in order to generate a verification map. Using the verification map, anyone can publicly verify the copyright of the protected image without needing the original image. Experiments show that the scheme can resistant geometric distortions and some intentional attacks. Without modifying the original image, the scheme is not only a robust method but also a lossless one.

System Dynamics Analysis of Policy-Choosing in Reverse Supply Chain

According to the relationship of the members in reverse supply chain and the members in forward supply chain, R/M integrated supply chain can be divided into two kinds: the strongly integrated R/M supply chain and the weakly integrated R/M supply chain. In the reverse supply chain of weakly integrated R/M supply chain, the manager of disassembly center wonder about the trend of future situation, including the collection amount, the inventory of the used-product, the collection price and the total profit. In this paper, we present the simulation of the latter reverse supply chain with different policies by system dynamics methodology, and give the analysis of the simulation results. By our simulation and analysis, the fluctuations of the used-product inventory, the collection amount and the collection price in policy II are smaller than that in policy I; the total profit of the reverse supply chain by policy II is better than that of policy I. As a result, the disassembly center should choose the policy II.

Simulation Analysis for Impacts of Supply Disruption on Reverse Supply Chain

The supply disruption of used-products between end-consumers and collector is one supply disruption of the reverse supply chain under our study. In order to analyze the impacts of this supply disruption on the reverse supply chain, we give an expanded stock-flow diagram with supply disruption of the reverse supply chain by using system dynamics methodology, show the simulation results of the collectors profit, the disassembly centers profit and the remanufacturers profit, and analyze the simulation results and the mean of their profits. This simulation model and the results can help the members of the reverse supply chain make appropriate decisions to ensure positive profits under different supply disruption periods.

Analysis of Penalty-Sharing of Reverse Supply Chain with Risk-Averse Collector

In practice, there are two kinds of reverse supply chain. One is that the members of the reverse supply chain are dependent and strongly integrated with the forward supply chain. Another is that the members of the reverse supply chain are independent and weakly integrated with the forward supply chain, and the members make their own management decisions and take full responsibility for their own profits and losses. In the later case, especially with a risk-averse collector, the disassembly center must make some decisions to ensure enough used-products to disassemble. In this paper, we analyze the penalty-sharing of the reverse supply chain with risk-averse collector. By our study, we give the optimal penalty-sharing ratio which the disassembly center should share and the optimal quantity of the used-product which the collector should collect. Furthermore, we analyze the optimal results by a numerical example. According the analysis, we find: the penalty-sharing ratio of the disassembly center is related to the risk aversion level of the collector; the penalty-sharing ratio is an important factor which will impact the profit of the collector and the disassembly center. The disassembly center should adjust the sharing ratio of the penalty in terms of the collectors risk-averse level.

Optimal control for IERs in reverse supply chain

The reverse supply chain with inspection-error-rates (IERs) under our study consists of two members: remanufacturer and collector. The collector is responsible for collecting the used-products from the end consumers, and inspecting the collected used-products. Owing to technical or non-technical factors, the collector may make inspection errors. In order to decrease the IERs, the collector will add more investment, namely, the unit inspecting cost will increase. In this paper, we focus on the dynamic analysis for reverse supply chain with IERs. The causal loop diagram for the reverse supply chain with IERs is developed using system dynamics methodology. We simulate the impacts of IERs and cost-share-ratio on profits of remanufacturer and collector. Based on the simulation results, the analyses of cost-sharing in the reverse supply chain with IERs are presented: under which conditions the remanufacturer should share the inspection cost with the collector so as to control the IERs.

New Operational Mode of R/M Integrated Supply Chain Based on IoT

Internet of Things (IoT) will be the new environment for the application of R/M integrated supply chain that includes the forward supply chain and the reverse supply chain. Under this new environment, the R/M integrated supply chain based on IoT will have some new characteristics. In order to investigate these new characteristics, we present the structure of R/M integrated supply chain based on IoT, introduce three stages (without RFID/EPC, with RFID and with RFID/EPC) of R/M integrated supply chain, and compare the third stage with the other two stages. The study results can help the managers to carry out the R/M integrated supply chain under IoT environment successfully.