Control Theory and Informatics最新文献

Control Theory and Informatics Pub Date : 2022-10-01 DOI: 10.7176/cti/11-02

I. Martinovic

引用次数: 7

SECURITY AND PRIVACY METHODS IN DISTRIBUTED SYSTEMS. 分布式系统中的安全和隐私方法。

Control Theory and Informatics Pub Date : 2021-12-01 DOI: 10.7176/cti/10-07

Irida Gjermeni, Dudina Hoxha

{"title":"SECURITY AND PRIVACY METHODS IN DISTRIBUTED SYSTEMS.","authors":"Irida Gjermeni, Dudina Hoxha","doi":"10.7176/cti/10-07","DOIUrl":"https://doi.org/10.7176/cti/10-07","url":null,"abstract":"Rapid technological developments and distributed systems have found their most significant expression in the field of communication and dissemination of information. This mass spread of communications through distributed systems such as: internet, intranet, web services, etc., has been influenced by a number of advantages that they present, which have to do with the ease, speed of communication, the ability to communicate in real time between two or more subjects that are located at great distances from each other, etc. Increasing use of computers, computer systems, and distributed systems has increased the potential risk of damage or misuse of data and computer systems. The dangers that exist are many where some are with minor consequences and some with major consequences, such as: viruses that delete or modify data in systems, gain access to personal computers and use them to attack others, theft of credentials or credit card data, etc. Unfortunately 100% security in a distributed system does not exist despite the measures that can be taken, but taking some security measures minimizes the risk. While in institutions and private companies the protection measures are greater due to the organization, technical structures or investments made for security systems, etc. and thus ensuring a certain level of security, ordinary citizens or users are the ones who are most exposed and must show personal care in their protection. Therefore, they should have basic knowledge about the methods of its preservation. In this paper, we first study the features and types of distributed systems, security methods through CAPTCHA systems, cryptography, firewalls, etc; DS access channels. As a conclusion, it is intended to build a program in Java, with NetBeans IDE environment that enables the encryption (encoding) of a file with the help of the symmetric encryption algorithm TEA, in this case the encryption of an image, its decryption and display after decryption.","PeriodicalId":437485,"journal":{"name":"Control Theory and Informatics","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122977528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study and Solution of Current Differential Protection Disability for High Series Compensation Transmission Line 高串联补偿输电线路电流差动保护失能的研究与解决

Control Theory and Informatics Pub Date : 2020-08-01 DOI: 10.7176/cti/10-06

Saleem Abbas, L. Fang

{"title":"Study and Solution of Current Differential Protection Disability for High Series Compensation Transmission Line","authors":"Saleem Abbas, L. Fang","doi":"10.7176/cti/10-06","DOIUrl":"https://doi.org/10.7176/cti/10-06","url":null,"abstract":"With the increasing day by day integration of large-size generators and tighter among the power systems, in internal fault, the fault current of Series Compensated (SC) lines could also be upturned. Therefore, the differential protection of SC transmission lines may stop working to operate because of less sensitivity. In this research article the causes for the current overturning in SC lines and its effects differential protection. The working characteristics of differential protection are analyzed by focusing on multiple-factors, for example, different series compensation degrees, types of fault, system operation mode, the difference of power angle, points of the fault, and transition resistance. An enhanced standard based on the current amplitudes and phases on both sides of the series compensated lines is proposed. Furthermore, to make stronger the operation characteristics of differential protection, the triple-fold line is chosen to get better sensitivity for internal faults in the article. The results are efficient to improve the protection sensitivity of SC lines during the internal fault. The PSCAD/EMTDC simulation and the power system dynamic physics simulation demonstrate that protection sensitivity is increased in the improved scheme. Keywords : Differential Protection, Series compensation, EHV/ UHV, Current reverse, sensitivity analysis. DOI: 10.7176/CTI/10-06 Publication date: August 31 st 2020","PeriodicalId":437485,"journal":{"name":"Control Theory and Informatics","volume":"41 12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131116895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

COMPARATIVE ANALYSIS OF NEURO- FUZZY AND SIMPLEX OPTIMIZATION MODEL FOR CONGESTION CONTROL IN ATM NETWORK. 神经模糊与单纯形优化模型在ATM网络拥塞控制中的比较分析。

Control Theory and Informatics Pub Date : 2020-07-01 DOI: 10.7176/cti/10-05

S. Egoigwe, Stephen Sunday Okika, T. O. Araoye, Chukwudozie Chukwudi Michael, Nwobi Chukwudumebi Gibson

{"title":"COMPARATIVE ANALYSIS OF NEURO- FUZZY AND SIMPLEX OPTIMIZATION MODEL FOR CONGESTION CONTROL IN ATM NETWORK.","authors":"S. Egoigwe, Stephen Sunday Okika, T. O. Araoye, Chukwudozie Chukwudi Michael, Nwobi Chukwudumebi Gibson","doi":"10.7176/cti/10-05","DOIUrl":"https://doi.org/10.7176/cti/10-05","url":null,"abstract":"Congestion always occurred when the transmission rate increased the data handling capacity of the network. Congestion normally arises when the network resources are not managed efficiently. Therefore if the source delivers at a speed higher then service rate queue, the queue size will be higher. Also if the queue size is finite, then the packet will observed delay . MATLAB Software was used to carry out simulations to develop Congestion control optimization Scheme for ATM Network with the aims to reducing the congestion of Enugu ATM Network. The results of the research reveal the minimization of congestion application model for Enugu ATM using optimization and Neuro-fuzzy. The result shows that congestion control model with Optimization and Neuro-fuzzy were 0.00003153 and 0.00002098 respectively. The ATM Congestion was reduced by 0.0000105, which is 18.2% decrease after Neuro-fuzzy controller was used. The results show the application of Neuro-fuzzy model which can use to control and minimized the ATM Congestion of Enugu ATM Network. The result shows that when Neuro-fuzzy is applied the congestion and the packet queue length in the buffer will be minimized. Key words: Congestion, MATLAB, Optimization, Neuro-fuzzy, ATM DOI: 10.7176/CTI/10-05 Publication date: July 31 st 2020","PeriodicalId":437485,"journal":{"name":"Control Theory and Informatics","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121724526","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nonholonomic System Modelling and Control with Single Degree of Freedom 单自由度非完整系统建模与控制

Control Theory and Informatics Pub Date : 2020-07-01 DOI: 10.7176/cti/10-04

E. K. Mensah

引用次数: 0

H2 Optimal and μ -synthesis Design of Quarter Car Active Suspension System 四分之一轿车主动悬架系统H2优化与μ综合设计

Control Theory and Informatics Pub Date : 2020-07-01 DOI: 10.7176/cti/10-03

引用次数: 0

Robust Control Theory Based Performance Investigation of an Inverted Pendulum System using Simulink 基于鲁棒控制理论的倒立摆系统Simulink性能研究

Control Theory and Informatics Pub Date : 2020-04-01 DOI: 10.7176/cti/9-04

Mustefa Jibril

引用次数: 6

Performance Investigation of H∞ Controller for Quarter Car Semi-active Suspension System Using Simulink 基于Simulink的四分之一轿车半主动悬架H∞控制器性能研究

Control Theory and Informatics Pub Date : 2020-03-01 DOI: 10.7176/jiea/10-2-02

Mustefa Jibril

{"title":"Performance Investigation of H∞ Controller for Quarter Car Semi-active Suspension System Using Simulink","authors":"Mustefa Jibril","doi":"10.7176/jiea/10-2-02","DOIUrl":"https://doi.org/10.7176/jiea/10-2-02","url":null,"abstract":"This paper affords the design and improvement of a semi-active suspension system for an automobile. The main idea is to increase the semi-active suspension system damping vibration of the automobile body even as crossing the bump and sine pavement on the road. This system is modelled for 1 / 4 car system after which the entire system has been simulated using Mat lab/Simulink. It is used to physically simulate the quarter vehicle system of the automobile and have a look at the time domain response to the road disturbances. H infinity controllers is used to govern the damping properties of the semi-active suspension system mechanically. The system is designed in contrast to the most of the available suspension systems using a third order hydraulic actuator. The proposed system is compared with H2 optimal controller to test the performance of the system for the control targets suspension deflection, body acceleration and body travel for the bump and sine road disturbances. The simulation result of this studies reveal the efficiency of the advanced H∞ controller for the quarter car semi-active suspension system. Keywords — Quarter Car Semi-active Suspension System, H∞ Controller, H2 optimal Controller DOI: 10.7176/JIEA/10-2-02 Publication date: March 31 st 2020","PeriodicalId":437485,"journal":{"name":"Control Theory and Informatics","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132895790","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Quarter Car Active Suspension System Design Using Optimal and Robust Control Method 基于最优鲁棒控制的四分之一汽车主动悬架系统设计

Control Theory and Informatics Pub Date : 2020-03-01 DOI: 10.7176/iel/10-2-04

Mustefa Jibril, P. Alluvada

引用次数: 5

Improved QPR Power Controller With Harmonic Compensator For Wind Grid-Connected Inverter 风电并网逆变器谐波补偿改进QPR功率控制器

Control Theory and Informatics Pub Date : 2019-03-01 DOI: 10.7176/cti/8-05

Sun Jian, Eid A. Amin, Zhang Yunning

引用次数: 0