Research on the attack strategy to reduce network effectiveness based on weighted topological separation ratio

2021 ◽  
Author(s):  
Xing Li ◽  
Yalin Fang ◽  
Mengbo Zhang ◽  
Yingke Lei
Keyword(s):  
Network Effectiveness ◽  
Separation Ratio ◽  
Attack Strategy

scholarly journals Secure multiparty quantum key agreement against collusive attacks

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hussein Abulkasim ◽  
Atefeh Mashatan ◽  
Shohini Ghose
Keyword(s):  
Key Agreement ◽  
Sensitive Information ◽  
Quantum Key Agreement ◽  
Key Agreement Protocol ◽  
Proposed Model ◽  
Shared Key ◽  
Agreement Protocols ◽  
Collusive Attacks ◽  
Attack Strategy ◽  
Collusive Attack

AbstractQuantum key agreement enables remote participants to fairly establish a secure shared key based on their private inputs. In the circular-type multiparty quantum key agreement mode, two or more malicious participants can collude together to steal private inputs of honest participants or to generate the final key alone. In this work, we focus on a powerful collusive attack strategy in which two or more malicious participants in particular positions, can learn sensitive information or generate the final key alone without revealing their malicious behaviour. Many of the current circular-type multiparty quantum key agreement protocols are not secure against this collusive attack strategy. As an example, we analyze the security of a recently proposed multiparty key agreement protocol to show the vulnerability of existing circular-type multiparty quantum key agreement protocols against this collusive attack. Moreover, we design a general secure multiparty key agreement model that would remove this vulnerability from such circular-type key agreement protocols and describe the necessary steps to implement this model. The proposed model is general and does not depend on the specific physical implementation of the quantum key agreement.

Coalition loyalty-programme adoption and urban commercial-network effectiveness evaluation

2014 ◽  
Vol 42 (9) ◽  
pp. 818-838 ◽  
Author(s):  
Ivan De Noni ◽  
Luigi Orsi ◽  
Luca Zanderighi
Keyword(s):  
Urban Areas ◽  
Dynamic Network ◽  
Theory And Practice ◽  
Evaluation Methodology ◽  
Marketing Theory ◽  
Urban Network ◽  
Content Type ◽  
Network Effectiveness ◽  
Commercial Network ◽  
Loyalty Programme

Purpose – To counter the proliferation of out-of-town shopping centres, a spontaneous or planned coalition loyalty programme (CLP), one involving most retailers in an urban network, may positively affect a town centre's capacity to entice customers and may enhance its competitiveness. The purpose of this paper is to assess the effectiveness of CLP implementation in town-centre management (TCM) as a tool for enhancing urban commercial-system attractiveness. Design/methodology/approach – The theoretical framework used in this study is supported by the evaluation methodologies of an empirical case study: the Savigliano Card project. CLP performance analysis uses a dynamic network-competitiveness index, an approach based on Laspeyres-type decomposition. The effects on each retailer's profitability are then tested by matching network and regression analyses. Findings – The results suggest that CLPs implementation in a TCM scheme can produce benefits and positive externalities for customers, retailers and urban areas. CLPs can influence a town centre's revitalisation process, improve the attractiveness of the urban commercial network and increase the profitability of private retailers by enhancing cross-selling dynamics. Practical implications – The paper provides a CLP performance-evaluation methodology and presents the benefits concerning CLP implementation in TCM strategies. Originality/value – This type of CLP is weakly exploited in marketing theory and practice; therefore, the paper provides theoretical and empirical explanations for the measurement of CLP effectiveness in TCM. In addition, it has significant implications for both practitioners and academics.

Minimizing the cost of wildland fire suppression: a model with uncertainty in predicted flame length and fire-line width produced

1994 ◽  
Vol 24 (6) ◽  
pp. 1253-1259 ◽  
Author(s):  
Romain Mees ◽  
David Strauss ◽  
Richard Chase
Keyword(s):  
Line Width ◽  
Wildland Fire ◽  
Fire Suppression ◽  
Flame Length ◽  
Burned Area ◽  
Expected Cost ◽  
Control Time ◽  
The Cost ◽  
Attack Strategy

We describe a model that estimates the optimal total expected cost of a wildland fire, given uncertainty in both flame length and fire-line width produced. In the model, a sequence of possible fire-line perimeters is specified, each with a forecasted control time. For a given control time and fire line, the probability of containment of the fire is determined as a function of the fire-fighting resources available. Our procedure assigns the resources to the fire line so as to minimize the total expected cost. A key feature of the model is that the probabilities reflect the degree of uncertainty in (i) the width of fire line that can be built with a given resource allocation, and (ii) the flame length of the fire. The total expected cost associated with a given choice of fire line is the sum of: the loss or gain of value of the area already burned; the cost of the resources used in the attack; and the expected loss or gain of value beyond the fire line. The latter is the product of the probability that the chosen attack strategy fails to contain the fire and the value of the additional burned area that would result from such a failure. The model allows comparison of the costs of the different choices of fire line, and thus identification of the optimal strategy. A small case study is used to illustrate the procedure.

Numerical Analysis of Thermal-Solutal Convection in Heterogeneous Porous Media

2005 ◽  
Vol 73 (1) ◽  
pp. 21-25 ◽  
Author(s):  
Charles-Guobing Jiang ◽  
M. Ziad Saghir ◽  
M. Kawaji
Keyword(s):  
Porous Media ◽  
Thermal Diffusion ◽  
Soret Effect ◽  
Heterogeneous Porous Media ◽  
Soret Coefficient ◽  
Solutal Convection ◽  
Coefficient Distribution ◽  
Separation Ratio ◽  
Diffusion In Porous Media ◽  
Vertical Cavity

Thermal diffusion, or Soret effect, in porous media is mathematically modeled with the Firoozabadi model based on non-equilibrium thermodynamics. The Soret effect in a binary mixture is investigated in a vertical cavity with heterogeneous permeability, where natural convection can occur. The thermo solutal convection with heterogeneous permeability was studied in terms of flow pattern, concentration distribution, component separation ratio, and Soret coefficient distribution. A consistent analysis was conducted and it is concluded that the Soret coefficient of thermal diffusion in porous media strongly depends on the heterogeneity of permeability.

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