检索结果-南通市图书馆

Statistical Analysis of a Class of Secure Relay Assisted Cognitive Radio Networks

China Communications 2018年第12期15卷 174-189页

作者： Mona Shokair Waleed Saad Shady M.Ibraheem Electronic and Electrical Comm.Dep. Faculty of Electronic EngineeringMeno.a UniversityEgypt Telecom Egypt Egypt Electrical Engineering Department College of EngineeringShaqra UniversityDawadmiAr RiyadhKingdom of Saudi Arabia

In this paper, the problem of communication security in an underlay wiretap cognitive radio network is addressed and statistically investigated. We rely on a simple dual-hop communication model of decode and forward relay assisted network. Regarding the interference from primary users, interference power and maximum transmit power constraints. this network is subjected to multiple eavesdropping attacks which employ a specific interception strategy. To confound this eavesdropping, proposed selection schemes are exploited that aim at maximizing the minimum of the dual secrecy rates in order to strengthen the physical layer security. Moreover, exact and asymptotic closed form expressions are derived for specific performance metrics over independent and identically distributed Rayleigh fading channels. At high signal to interference noise ratio(SINR), tangential system bounds are also derived and discussed. Monte Carlo simulation results emphasize our assumption. It is found out that at the full diversity of the system, any additional node that enters the cooperative eavesdropping system becomes significantly of no effect.

关键词： relay selection non-colluding or colluding eavesdroppers outage probability secrecy rate power constraints.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A trust region algorithm for optimization with nonlinear equality and linear inequality constraints

引用

Science China Mathematics 1996年第8期39卷 799-806页

作者：陈中文韩继业 Institute of Applied Mathematics Chinese Academy of Sciences Beijing 100080 China

A new algorithm of trust region type is presented to minimize a differentiable function ofmany variables with nonlinear equality and linear inequality constraints. Under the milder conditions, theglobal convergence of the main algorithm is proved. Moreover, since any nonlinear inequality constraint can beconverted into an equation by introducing a slack variable, the trust region method can be used in solving general nonlinear programming problems.

关键词： trust regions global convergence nonlinear equality constraints linear inequality constraints.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Software Tools for Some Natural Language Texts Computer Processing

引用

Computer Technology and Application 2012年第3期3卷 219-225页

作者： Jemal Antidze Nana Gulua Vekua Scientific Institute of Applied Mathematics Tbilisi State University Tbilisi 0186 Georgia Faculty of Mathematics and Computer Science Sukhumi State University Tbilisi 0186 Georgia

Software tools are developed for computer realization of syntactic, semantic, and morphological models of natural language texts, using rule based programming. The tools are efficient for a language, which has free order of words and developed morphological structure like Georgian. For instance, a Georgian verb has several thousand verb-forms. It is very difficult to express rules of morphological analysis by finite automaton and it will be inefficient as well. Resolution of some problems of full morphological analysis of Georgian words is impossible by finite automaton. Splitting of some Georgian verb-forms into morphemes requires non-deterministic search algorithm, which needs many backtrackings. To minimize backtrackings, it is necessary to put constraints. which exist among morphemes and verify them as soon as possible to avoid false directions of search. Software tool for syntactic analysis has means to reduce rules, which have the same members in different order. The authors used the tool for semantic analysis as well. Thus, proposed software tools have many means to construct efficient parser, test and correct it. The authors realized morphological and syntactic analysis of Georgian texts by these tools. In the presented paper, the authors describe the software tools and its application for Georgian language.

关键词： Software tools parsing algorithm backtracking syntactic analyzer constraints.

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Marine Fishermen’s Perception about Consequences of Climate Change on Fisheries in Tamil Nadu State,India

引用

Journal of Agricultural Science and Technology(B) 2020年第3期10卷 186-193页

作者： Kapparapu Sai Susmitha Bhargavi Nambali Valsalan Sujathkumar Rajagopal Santhakumar Paulraj Jawahar Fisheries Polytechnic and Vocational Degree College Pydah Educational InstitutionKakinadaEast Godavari 533461India Department of Fisheries Extension Economics and StatisticsFisheries College and Research InstituteTamil Nadu Dr.J.Jayalalithaa Fisheries UniversityThoothukudi 628008India Tamil Nadu Dr.J.Jayalalithaa Fisheries University Nagapattinam 611002India

Global climate change has become a critical barrier in the twenty-first century and it alarms the marine fishermen to respond and react until conditions become more *** with climate by humans occurs at all levels,but recent research has focused on industries,technological and demographic *** far,less attention has been paid to investigate the factors which affect perception and decision-making at the individual *** uncertain condition of climate on marine fisheries from the last two decades had created drastic change in ecosystems as well as in the fishers’*** are the group who first experiences the bitter conditions of climate change on marine fisheries because their livelihood depends highly on the marine ***,the fishers’perception about the consequences of climate change on fisheries may help to emerge the fisheries by implicating certain productive management *** research has been carried out in the two southern coastal districts of Ramanathapuram and Kanyakumari,Tamil Nadu state to find out the fishers’perception of the consequences of climate change on fisheries.A sample size consisting of 120 marine fishermen were randomly selected and *** results inferred that increase in cost of fishing,increase in fishing investments,decline in fishing days,reduction in fish diversity and fish catches were the major consequences faced by fishers due to the climate change.

关键词： Marine fishermen perception climate change consequences constraints.

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：