scholarly journals Modelling and Control of Trojan Propagation via Online Game Accelerators

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Qing Yan ◽  
Lipeng Song
Keyword(s):  
Control Strategies ◽  
Computer Game ◽  
Compartment Model ◽  
Numerical Results ◽  
Online Game ◽  
Optimal Control Strategy ◽  
Game Player ◽  
Game Players ◽  
The Stability ◽  
And Control

The widespread use of online game accelerators also induces them to become a medium for hackers to spread Trojan horses. In this paper, we propose a novel compartment model which considered the heterogeneity of online computer game players aiming to characterize the Trojan propagation. Specifically, we distinguish rational game players from impulsive game players in our model. The spreading threshold is obtained, and the global stability of equilibrium is also verified. Moreover, Trojan’s control problem is studied by using Pontryagin’s maximum principle. Numerical results confirm the stability of the system and the effectiveness of the optimal control strategy. Besides, more numerical results also show that some control strategies such as warning and caution should be taken at the very beginning of game player downloading the malicious accelerator.

Modeling the System and Component Performance Interactions of a SOFC Based APU for Changes in Application Load: Transient Response and Control Strategy

2004 ◽  
Author(s):  
D. F. Rancruel ◽  
M. R. von Spakovsky
Keyword(s):  
Transient Response ◽  
Control Strategy ◽  
Control Strategies ◽  
Control Variable ◽  
System Level ◽  
System Component ◽  
System Response ◽  
Optimal Control Strategy ◽  
Synthesis Design ◽  
And Control

Solid-Oxide-Fuel-Cell (SOFC) stacks respond in seconds to changes in load while the balance of plant subsystem (BOPS) responds in times several orders of magnitude higher. This dichotomy diminishes the reliability and performance of SOFC electrodes with changes in load. In the same manner current and voltage ripples which result from particular power electronic subsystem (PES) topologies and operation produce a negative effect on the SOFC stack subsystem (SS) performance. The difference in transient response among the sub-systems must be approached in a way which makes operation of the entire system not only feasible but ensures that efficiency and power density, fuel utilization, fuel conversion, and system response are optimal at all load conditions. Thus, a need exists for the development of transient component- and system-level models of SOFC based auxiliary power units (APUs), i.e. coupled BOPS, SS, and PES, and the development of methodologies for optimizing subsystem responses and for investigating system-interaction issues. In fact the transient process occurring in a SOFC based APU should be systematically treated during the entire creative process of synthesis, design, and operational control, leading in its most general sense to a dynamic optimization problem. This entails finding an optimal system/component synthesis/design, taking into account on- and off-design operation, which in turn entails finding an optimal control strategy and control profile for each sub-system/component and control variable. Such an optimization minimizes an appropriate objective function while satisfying all system constraints. A preliminary set of chemical, thermal, electrochemical, electrical, and mechanical models based on first principles and validated with experimental data have been developed and implemented using a number of different platforms. These models have been integrated in order to be able to perform component, subsystem, and system analyses as well as develop optimal syntheses/designs and control strategies for transportation and stationary SOFC based APUs. Some pertinent results of these efforts are presented here.

scholarly journals Investigations on Vehicle Rollover Prevention Using LQG Regulator

2014 ◽  
Vol 2014 ◽  
pp. 1-11
Author(s):  
Binda Mridula Balakrishnan ◽  
Marimuthu Rajaram
Keyword(s):  
Control Strategies ◽  
Stability Margin ◽  
Initial Investigation ◽  
Rollover Prevention ◽  
Contact Information ◽  
Vehicle Rollover ◽  
The Stability ◽  
And Control

This paper presents results of an initial investigation into vehicle roll model and control strategies suitable for preventing vehicle untripped rollovers. For vehicles that are deemed to be susceptible to wheel-liftoff, various control strategies are implemented in simulation. In this study, the authors propose a method for rollover prevention that does not require such accurate contact information. The validity of the stability margin is shown, and it is used to realize rollover prevention in the direction of the roll. The primary assumption in their implementation is that the vehicle in question is equipped with a conventional controller system.

scholarly journals A Small Membrane Stabilizing Protein Critical to the Pathogenicity of Staphylococcus aureus

2020 ◽  
Vol 88 (9) ◽  
Author(s):  
Seána Duggan ◽  
Maisem Laabei ◽  
Alaa Abdulaziz Alnahari ◽  
Eóin C. O’Brien ◽  
Keenan A. Lacey ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Iron Homeostasis ◽  
Control Strategies ◽  
Antibiotic Resistant ◽  
Content Type ◽  
Promising Target ◽  
Significant Impairment ◽  
The Stability ◽  
Conventional Antibiotics ◽  
And Control

ABSTRACT Staphylococcus aureus is a major human pathogen, and the emergence of antibiotic-resistant strains is making all types of S. aureus infections more challenging to treat. With a pressing need to develop alternative control strategies to use alongside or in place of conventional antibiotics, one approach is the targeting of established virulence factors. However, attempts at this have had little success to date, suggesting that we need to better understand how this pathogen causes disease if effective targets are to be identified. To address this, using a functional genomics approach, we have identified a small membrane-bound protein that we have called MspA. Inactivation of this protein results in the loss of the ability of S. aureus to secrete cytolytic toxins, protect itself from several aspects of the human innate immune system, and control its iron homeostasis. These changes appear to be mediated through a change in the stability of the bacterial membrane as a consequence of iron toxicity. These pleiotropic effects on the ability of the pathogen to interact with its host result in significant impairment in the ability of S. aureus to cause infection in both a subcutaneous and sepsis model of infection. Given the scale of the effect the inactivation of MspA causes, it represents a unique and promising target for the development of a novel therapeutic approach.

I am you, you are me: game character congruence with the ideal self

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Dong Woo Ko ◽  
Jihye Park
Keyword(s):  
Structural Equation ◽  
Online Survey ◽  
Positive Impact ◽  
Online Game ◽  
Ideal Self ◽  
Content Type ◽  
Self Image ◽  
Game Player ◽  
Game Players ◽  
The Ideal

PurposeThe purpose of this research is to examine the effects of congruence between the ideal self-image of a game player and the game character on identification and interaction with the game character, perceived game power and performance, character attachment and willingness to spend money on the game character.Design/methodology/approachA total of 347 online game players participated in an online survey posted via the nationwide crowdsourcing web service Mechanical Turk in the US. A structural equation modelling was conducted using a maximum-likelihood estimation procedure to test the relationships among the variables.FindingsThe results revealed a significant positive impact of congruence between a game character and the ideal self-image of a game player on identification and interaction with the game character, perceived game power, game performance, attachment to the game character and willingness to spend money on the game character.Originality/valueAlthough significant research has been conducted in the area of online gaming, limited attention has been given to the strategic game content that stimulates a player's intention to purchase game items. Due to the challenges in sales growth in the game industry caused by business model shifts from a subscription-based model to a free-to-play one, it is important for marketing practitioners to motivate game players to continue playing the game and purchase game items. The results of this study provide valuable strategic insights to overcome the limitations of existing marketing strategies in the online game business.

scholarly journals Professional Gamer: The Meaning on ‘Point Blank Online’ Play

2019 ◽  
Vol 11 (1) ◽  
pp. 18
Author(s):  
Muhd Ar. Imam Riauan ◽  
Abdul Aziz
Keyword(s):  
Growth Rate ◽  
Online Games ◽  
The Other ◽  
Research Use ◽  
Online Game ◽  
Game Player ◽  
Descriptive Approach ◽  
Game Players ◽  
Clear Goal ◽  
Research Show

<p class="Abstract"><em><span lang="IN">The growth rate of online game players in Indonesia is 33% average per year on 2010 and 35% on 2013. Majority of game players are not able to control game play activities and only waste time. On the other hand there is a group of online game players who are capable of achieving and succeeding in the online gaming world especially in playing Point Blank. </span><span>This research use qualitative analysis</span><span lang="IN"> with descriptive approach</span><span> to investigate the professional online game player on ‘Team Fun’ Group that consist of 6 player with different ability in Point Blank. This research show that the </span><span>meaning on Point Blank </span><span lang="IN">give a chance for </span><span>the </span><span lang="IN">player</span><span>to become professional gamers</span><span lang="IN"> as long as</span><span lang="IN">t</span><span>he players able to determine their goals and dreams in playing online games</span><span lang="IN">. Professional game player</span><span>also must join a solid team </span><span lang="IN">to</span><span> clear goal in play.</span></em></p>

Modeling and Control of a Spherical Inverted Pendulum With Actuator Saturation

2019 ◽  
Author(s):  
Geovani Bondo ◽  
Chengzhi Yuan ◽  
Chang Duan
Keyword(s):  
Degrees Of Freedom ◽  
Inverted Pendulum ◽  
Actuator Saturation ◽  
Control Strategies ◽  
Mathematic Model ◽  
Disturbance Attenuation ◽  
Modeling And Control ◽  
Advanced Control ◽  
The Stability ◽  
And Control

Abstract This paper studies the modeling and control of a spherical inverted pendulum (SIP). The SIP is deemed to be a reasonable model for rocket-propelled body and is often used to test advanced control strategies. The mathematic model is derived based on a Quanser two degrees-of-freedom inverted pendulum commercial product. The pendulum is mounted on a five-bar mechanism that is actuated by two rotary servo base units. Unlike conventional assumption that the two motors are allowed to rotate simultaneously, we assume a more challenging scenario that at one time only one motor is working. The system is hence modeled as a switched system as two motors have to be switched in order to balance the pendulum at its unstable equilibrium. Switched controllers, together with a switching strategy are developed to ensure the stability of the system and satisfy a disturbance attenuation performance index. Simulation results are presented to show the effectiveness of the proposed method.

scholarly journals Modeling and Control of Malware Propagation in Wireless IoT Networks

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Qing Yan ◽  
Lipeng Song ◽  
Chenlu Zhang ◽  
Jing Li ◽  
Shanshan Feng
Keyword(s):  
Control Strategies ◽  
Minimum Principle ◽  
Cost Effective ◽  
Threshold Value ◽  
Wireless Internet ◽  
Optimal Control Strategy ◽  
Modeling And Control ◽  
Malware Propagation ◽  
Iot Devices ◽  
And Control

Wireless Internet of Things (IoT) devices densely populate our daily life, but also attract many attackers to attack them. In this paper, we propose a new Heterogeneous Susceptible-Exposed-Infected-Recovered (HSEIR) epidemic model to characterize the effect of heterogeneity of infected wireless IoT devices on malware spreading. Based on the proposed model, we obtain the basic reproduction number, which represents the threshold value of diffusion and governs that the malware is diffusion or not. Also, we derive the malware propagation scale under different cases. These analyses provide theoretical guidance for the application of defense techniques. Numerical simulations validated the correctness and effectiveness of theoretical results. Then, by using Pontryagin’s Minimum Principle, optimal control strategy is proposed to seek time-varying cost-effective solutions against malware outbreaks. More numerical results also showed that some control strategies, such as quarantine and vaccination, should be taken at the beginning of the malware outbreak immediately and become less necessary after a certain period. However, the repairing and fixing strategy, for example applying antivirus patches, would be keep on going constantly.

Processing Quality Dynamic Control Based on Quality State

2010 ◽  
Vol 37-38 ◽  
pp. 905-909 ◽  
Author(s):  
Yi Yong Yao ◽  
Li Ping Zhao ◽  
Yong Tao Qin
Keyword(s):  
Quality Control ◽  
Correlation Analysis ◽  
Control Strategies ◽  
Dynamic Control ◽  
Control Model ◽  
Quality Data ◽  
Formal Description ◽  
Identification Methods ◽  
The Stability ◽  
And Control

Depending on the identification methods of quality state such as correlation analysis, a quality identification and control model based on quality state was established in this paper. This model included formal description methods, identification methods, and quality control strategies. Based on the product quality data correlation analysis, the model’s application procedures were put forward. It provides an effective approach to maintaining ideal quality state, to improving the stability and controllability of quality control system. It constructs an application foundation for quality dynamic control.

scholarly journals MPPT Control for Wind Energy Conversion System Based on a T-S Fuzzy

2018 ◽  
Vol 9 (2) ◽  
pp. 811 ◽  
Author(s):  
Abdennasser Benkada ◽  
H. Chaikhy ◽  
M. Monkade
Keyword(s):  
Control Strategies ◽  
Fuzzy Model ◽  
Synchronous Generator ◽  
Maximum Power ◽  
Linear Matrix ◽  
Modeling And Control ◽  
Point Tracking ◽  
Power Point ◽  
The Stability ◽  
And Control

<span lang="EN-US">In this paper, we focus on the modeling and control of a wind power system based on a Permanent Magnet Synchronous Generator (PMSG). We proposed a technique of control strategies to have the maximum power from wind turbine (WT). This study deals with the problem of Maximum Power Point Tracking (MPPT) based on Takagi Sugeno fuzzy model. The stability analysis is achieved. The gains of the designed controller are calculated by solving Linear Matrix Inequality (LMI). Finally, simulation results are provided to demonstrate the validity and the effectiveness of the proposed method.  </span>

The Research of the Photovoltaic DC Grid-Connected Converter Applied in Flexible DC Grid

2014 ◽  
Vol 556-562 ◽  
pp. 1712-1715 ◽  
Author(s):  
Chang Bin Ju ◽  
Huan Wang ◽  
Wei Feng ◽  
Hong Hua Xu
Keyword(s):  
Control Strategies ◽  
Rapid Development ◽  
Power Level ◽  
Reference Value ◽  
Extension Problem ◽  
High Voltage Direct Current ◽  
Hybrid Microgrid ◽  
New Energy ◽  
The Stability ◽  
And Control

With the rapid development of flexible HVDC technology in China, the demand for the DC grid of new energy generation projects growth. This paper studies the topology of the DC grid photovoltaic converter, a topological scheme is proposed and detailed analysis of the topology of the work mode is presented. For the device extension problem of equipment used in high-voltage direct current power level, a connecting scheme based on modular IPOS program and a control strategy of uniform duty cycle are given. In this paper, the equivalent controlled source method for small-signal dynamic modeling is established, and the stability of the control scheme is analyzed using Bode diagram. Finally, a 10kW prototype platform topology programs is built and control strategies experimentally is verified. This paper has important reference value for the HVDC grid-connected research of new energy power generation and the research of small power scale AC-DC hybrid microgrid network.

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