scholarly journals The Evolutionary Equilibrium of Block Withholding Attack

2021 ◽  
Vol 9 (3) ◽  
pp. 266-279
Author(s):  
Yukun Cheng ◽  
Zhiqi Xu ◽  
Shuangliang Yao
Keyword(s):  
Evolutionary Game ◽  
Dynamic Equations ◽  
Game Model ◽  
Replicator Dynamic ◽  
The World ◽  
Stable Solutions ◽  
Simulation Results ◽  
The Impact ◽  
Theoretical Results ◽  
Selection Of

Abstract Bitcoin is the most famous and the most used cryptocurrency in the world, such that it has received extreme popularity in recent years. However the Bitcoin system is accompanied by different attacks, including the block withholding (BWH) attack. When a miner plays the BWH attack, it will withhold all the blocks newly discovered in the attack pool, damaging the honest miners’ right to obtain the fair reward. In this paper, we consider a setting in which two miners may honestly mine or perform the BWH attack in a mining pool. Different strategy profiles will bring different payoffs, in addition influence the selection of the strategies. Therefore, we establish an evolutionary game model to study the behavior tendency of the miners and the evolutionary stable strategies under different conditions, by formulating the replicator dynamic equations. Through numerical simulations, we further verify the theoretical results on evolutionary stable solutions and discuss the impact of the factors on miners’ strategic choice. Based on these simulation results, we also make some recommendations for the manager and the miners to mitigate the BWH attack and to promote the cooperation between miners in a mining pool.

scholarly journals A Study of Taxi Service Mode Choice Based on Evolutionary Game Theory

2019 ◽  
Vol 2019 ◽  
pp. 1-17
Author(s):  
Zhu Bai ◽  
Mingxia Huang ◽  
Shuai Bian ◽  
Huandong Wu
Keyword(s):  
Game Theory ◽  
Evolutionary Game Theory ◽  
Mode Choice ◽  
Evolutionary Game ◽  
Payoff Matrix ◽  
Game Model ◽  
Stable States ◽  
Taxi Service ◽  
Service Mode ◽  
The Impact

The emergence of online car-hailing service provides an innovative approach to vehicle booking but has negatively influenced the taxi industry in China. This paper modeled taxi service mode choice based on evolutionary game theory (EGT). The modes included the dispatching and online car-hailing modes. We constructed an EGT framework, including determining the strategies and the payoff matrix. We introduced different behaviors, including taxi company management, driver operation, and passenger choice. This allowed us to model the impact of these behaviors on the evolving process of service mode choice. The results show that adjustments in taxi company, driver, and passenger behaviors impact the evolutionary path and convergence speed of our evolutionary game model. However, it also reveals that, regardless of adjustments, the stable states in the game model remain unchanged. The conclusion provides a basis for studying taxi system operation and management.

scholarly journals Research on Cooperative Innovation Behavior of Industrial Cluster Based on Subject Adaptability

2016 ◽  
Vol 2016 ◽  
pp. 1-19 ◽  
Author(s):  
Xiaohui Jia ◽  
Minghui Jiang ◽  
Lei Shi
Keyword(s):  
Steady State ◽  
Evolutionary Game ◽  
Industrial Cluster ◽  
Industrial Clusters ◽  
Government Support ◽  
Correlated Equilibrium ◽  
Game Model ◽  
Cooperative Innovation ◽  
The Cost ◽  
The Impact

From the perspective of the interactive cooperation among subjects, this paper portrays the process of cooperative innovation in industrial cluster, in order to capture the correlated equilibrium relationship among them. Through the utilization of two key tools, evolutionary stable strategy and replicator dynamics equations, this paper considers the cost and gains of cooperative innovation and the amount of government support as well as other factors to build and analyze a classic evolutionary game model. On this basis, the subject’s own adaptability is introduced, which is regarded as the system noise in the stochastic evolutionary game model so as to analyze the impact of adaptability on the game strategy selection. The results show that, in the first place, without considering subjects’ adaptability, their cooperation in industrial clusters depends on the cost and gains of innovative cooperation, the amount of government support, and some conditions that can promote cooperation, namely, game steady state. In the second place after the introduction of subjects’ adaptability, it will affect both game theory selection process and time, which means that the process becomes more complex, presents the nonlinear characteristics, and helps them to make faster decisions in their favor, but the final steady state remains unchanged.

Transnational Protest and The Public Sphere

2005 ◽  
Vol 10 (1) ◽  
pp. 95-109 ◽  
Author(s):  
Michelle Beyeler ◽  
Hanspeter Kriesi
Keyword(s):  
Public Sphere ◽  
Media Coverage ◽  
Public Support ◽  
Economic Globalization ◽  
The Public ◽  
The World ◽  
World Economic ◽  
The Public Sphere ◽  
The Impact ◽  
Selection Of

This article explores the impact of protests against economic globalization in the public sphere. The focus is on two periodical events targeted by transnational protests: the ministerial conferences of the World Trade Organization (WTO) and the annual meetings of the World Economic Forum (WEF). Based on a selection of seven quality newspapers published in different parts of the world, we trace media attention, support of the activists, as well as the broader public debate on economic globalization. We find that starting with Seattle, protest events received extensive media coverage. Media support of the street activists, especially in the case of the anti-WEF protests, is however rather low. Nevertheless, despite the low levels of support that street protesters received, many of their issues obtain wide public support.

Interaction Between Camel Farming and Environment

2020 ◽  
pp. 363-378
Author(s):  
Bernard Faye
Keyword(s):  
Production System ◽  
Greenhouse Gas Emission ◽  
Desert Environment ◽  
Active Growth ◽  
Current Trends ◽  
The World ◽  
Animal Metabolism ◽  
Extensive Farming ◽  
The Impact ◽  
Selection Of

The close adaptation of camel to its desert environment could explain its weak expansion out of the arid lands of the world. This adaptation can contribute to the desertification combat, attesting to its small ecological footprint with traditional extensive farming. The camel population in the world, despite its active growth, remains marginal, and its contribution to the greenhouse gas emission is negligible. However, the current trends to the intensification of camel productions could change the impact of the species on the environment and on animal metabolism. The necessity to expect a better productivity face to the growing demand could lead to a “specialization” of the camel farms and a specific selection of the camel. Such trends require care with a possible erosion of the camel biodiversity and the consequences on the interactions between the emerging camel production system and the environment.

scholarly journals Managing new PV plant connection to available grids to stay within standard limits with a case study

2021 ◽  
Vol 4 (2) ◽  
Author(s):  
Ehsan Najafi ◽  
Amin Mirzaei ◽  
Mahdi Mahdi Rezvanyvardom ◽  
Mahdi Zolfaghar
Keyword(s):  
General Algorithm ◽  
Solar Irradiation ◽  
Constant Amount ◽  
Distinct Part ◽  
Electric Grids ◽  
The World ◽  
Simulation Results ◽  
Selection Of

PV plants are increasing all over the world and they are becoming a distinct part of electric grids. Due to abundance of solar irradiation and almost constant amount of it in certain geographical latitudes, selection of proper capacity of PV plants depends mostly on available places for the site. in this paper, important measures for safe connection of a PV plant in terms of voltage requirements are addressed and several guidelines are introduced for this purpose. In addition, simulation results are included to prove some of the mentioned suggestions. a general algorithm is finally proposed to show the directions for safe connection of PV plants.

scholarly journals PUEGM: A Method of User Revenue Selection Based on a Publisher-User Evolutionary Game Model for Mobile Crowdsensing

Sensors ◽  
2019 ◽  
Vol 19 (13) ◽  
pp. 2927
Author(s):  
Zihao Shao ◽  
Huiqiang Wang ◽  
Guangsheng Feng
Keyword(s):  
Data Quality ◽  
Quality Assessment ◽  
Low Cost ◽  
Evolutionary Game ◽  
Real Data ◽  
Quality Data ◽  
Game Model ◽  
Mobile Crowdsensing ◽  
Data Quality Assessment ◽  
Selection Of

Mobile crowdsensing (MCS) is a way to use social resources to solve high-precision environmental awareness problems in real time. Publishers hope to collect as much sensed data as possible at a relatively low cost, while users want to earn more revenue at a low cost. Low-quality data will reduce the efficiency of MCS and lead to a loss of revenue. However, existing work lacks research on the selection of user revenue under the premise of ensuring data quality. In this paper, we propose a Publisher-User Evolutionary Game Model (PUEGM) and a revenue selection method to solve the evolutionary stable equilibrium problem based on non-cooperative evolutionary game theory. Firstly, the choice of user revenue is modeled as a Publisher-User Evolutionary Game Model. Secondly, based on the error-elimination decision theory, we combine a data quality assessment algorithm in the PUEGM, which aims to remove low-quality data and improve the overall quality of user data. Finally, the optimal user revenue strategy under different conditions is obtained from the evolutionary stability strategy (ESS) solution and stability analysis. In order to verify the efficiency of the proposed solutions, extensive experiments using some real data sets are conducted. The experimental results demonstrate that our proposed method has high accuracy of data quality assessment and a reasonable selection of user revenue.

scholarly journals Study on Stochastic Differential Game Model in Network Attack and Defense

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Xiaotong Xu ◽  
Gaocai Wang ◽  
Jintian Hu ◽  
Yuting Lu
Keyword(s):  
Differential Equation ◽  
Stochastic Differential Equation ◽  
Evolutionary Game ◽  
Markov Property ◽  
Game Model ◽  
Strategy Selection ◽  
Network Attack ◽  
Disturbance Factor ◽  
Attack And Defense ◽  
Selection Of

In recent years, evolutionary game theory has been gradually applied to analyze and predict network attack and defense for maintaining cybersecurity. The traditional deterministic game model cannot accurately describe the process of actual network attack and defense due to changing in the set of attack-defense strategies and external factors (such as the operating environment of the system). In this paper, we construct a stochastic evolutionary game model by the stochastic differential equation with Markov property. The evolutionary equilibrium solution of the model is found and the stability of the model is proved according to the knowledge of the stochastic differential equation. And we apply the explicit Euler numerical method to analyze the evolution of the strategy selection of the players for different problem situations. The simulation results show that the stochastic evolutionary game model proposed in this paper can get a steady state and obtain the optimal defense strategy under the action of the stochastic disturbance factor. In addition, compared with other kinds of literature, we can conclude that the return on security investment of this model is better, and the strategy selection of the attackers and defenders in our model is more suitable for actual network attack and defense.

Dynamic Research of Construction Safety with Building Materials

2012 ◽  
Vol 496 ◽  
pp. 339-342
Author(s):  
Lu Jia ◽  
Fei Fei Fu
Keyword(s):  
Policy Making ◽  
Building Materials ◽  
Evolutionary Game ◽  
Construction Safety ◽  
Game Model ◽  
Safety Regulation ◽  
Regulation Policy ◽  
Important Approach ◽  
Simulation Results ◽  
The Stability

Safety regulation is an important approach to secure the constructing process. A three-player regulation evolutionary game model is built, the stability analysis and simulation results show that evolutionary equilibrium (EE) does not exist, providing a convenient way for regulation policy making.

scholarly journals Impact of Social Networks on Diffusion of Products

2014 ◽  
Vol 5 (1) ◽  
pp. 35-50
Author(s):  
Yudai Arai ◽  
Tomoko Kajiyama ◽  
Noritomo Ouchi
Keyword(s):  
Social Networks ◽  
Consumer Behaviour ◽  
Advertising Budget ◽  
The World ◽  
Agent Simulation ◽  
Multi Agent ◽  
Simulation Results ◽  
The Difference ◽  
Using Data ◽  
The Impact

In light of the rapid growth of social networks around the world, this study analyses the impact of social networks on the diffusion of products and demonstrates the effective way to diffuse products in the society where social networks play an important role. We construct a consumer behaviour model by multi-agent simulation taking the movie market as an example. After validating it by using data from 13 US movies, we conduct simulations. Our simulation results show that the impact of social networks on the diffusion differs according to the customers’ expectations and evaluation for a movie. We also demonstrate the effective weekly advertising budget allocations corresponding to the types of movies. We find that the difference of weekly advertising budget allocations gives greater impact on the diffusion with the growth of social networks. This paper provides firm’s managers with important suggestions for diffusion strategy considering the impact of social networks.

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