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作者： Eliáš, Luboš Brno University of Technology

Hlavním cílem této diplomové práce je implementace obecného zabezpečeného peer-to-peer komunikačního systému. Systém má schopnost zcela automatizovaně naváz... 详细信息

Hlavním cílem této diplomové práce je implementace obecného zabezpečeného peer-to-peer komunikačního systému. Systém má schopnost zcela automatizovaně navázat a provozovat zabezpečené spojení mezi koncovými uzly komunikace. Tuto schopnost má i v případě, kdy se v cestě k cílovému systému nachází překladače síťových adres, bez nutnosti explicitně tyto překladače konfigurovat. Zabezpečovací procedury tohoto systému jsou transparentně skryty před jednotlivými síťovými aplikacemi, které tento problém musely řešit každá samostatně. Odpovědnost za bezpečnost je přenesena na aplikačně nezávislý subsystém pracující v rámci jádra operačního systému. Bezpečnost tohoto subsystému je založena na zachytávání odchozích a příchozích IP paketů a jejich autentizaci a šifrování. Systém se podařilo implementovat na operačním systému Microsoft Windows XP, v programovacím jazyku C++. Byla změřena přenosová rychlost komunikačního tunelu systému na různých šířkách pásma sítě. Výsledky ukazují, že při použití systému na běžných dnešních počítačích nedochází k prakticky žádnému zpomalení přenosové rychlosti oproti nešifrovanému kanálu.

关键词： komunikace kryptografie peer to peer NAT UDP hole punching síťové programování C++ MS Windows IPsec SSL/TLS communication cryptography peer-to-peer NAT UDP hole punching network programming C++ MS Windows IPsec SSL/TLS Text

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Design and Implementation of the FINS Framework: Flexible Internetwork Stack

Design and Implementation of the FINS Framework: Flexible In...

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作者： Reed, Jonathan Michael Virginia Tech | University

This thesis describes the Flexible Internetwork Stack (FINS) Framework, an open-source tool to facilitate experimental research in wireless networks on multiple platforms. The FINS Framework uses a module-based architecture that allows cross-layer behavior and runtime reconfiguration of the protocol stack. Version 1.0 of the framework makes use of existing physical and data link layer functionality, while enabling modifications to the stack at the network layer and above, or even the implementation of a clean-slate, non-layered protocol architecture. Protocols, stubs for communicating with intact layers, and management and supervisory functions are implemented as FINS Framework modules, interconnected by a central switch. This thesis describes the FINS Framework architecture, presents an initial assessment along with experiments on Android and Ubuntu enabled by the tool, and documents an intuitive mechanism for transparently intercepting socket calls that maintains efficiency and flexibility.

关键词： network programming network Protocols Mobile Ad hoc networks Mobile Computing Thesis

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Reducing processor usage on heavily-loaded network servers with POSIX real-time scheduling control

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IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS 2005年第6期E88D卷 1168-1177页

作者： Kawai, E Kadobayashi, Y Yamaguchi, S Nara Inst Sci & Technol Ikoma 6300101 Japan

Polling I/O mechanisms on the Unix platform such as select() and poll() cause high processing overhead when they are used in a heavily-loaded network server with many concurrent open sockets. Large waste of processing power incurs not only service degradation but also various troubles such as high electronic power consumption and worsened MTBF of server hosts. It is thus a serious issue especially in large-scale service providers such as an Internet data center (iDC) where a great number of heavily-loaded network servers are operated. As a solution of this problem, we propose a technique of fine-grained control on the invocation intervals of the polling I/O function. The uniqueness of this study is the utilization of POSIX real-time scheduling to enable the fine-grained execution control. Although earlier solutions such as an explicit event delivery mechanism also addressed the problem, they require major modification in the OS kernel and transition from the traditional polling I/O model to the new explicit event-notification model. On the other hand, our technique can be implemented with low cost because it just inserts a few small blocks of codes into the server program and does not require any modification in the OS kernel.

关键词： polling I/O POSIX real-time scheduling interval control processor utilization network programming

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A Mathematical Model for a Multi-Commodity, Two-Stage Transportation and Inventory Problem

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INTERNATIONAL JOURNAL OF INDUSTRIAL ENGINEERING-THEORY APPLICATIONS AND PRACTICE 2008年第3期15卷 278-285页

作者： Ji, P. Chen, K. J. Yan, Q. P. Hong Kong Polytech Univ Dept Ind & Syst Engn Hong Kong Hong Kong Peoples R China SW Jiaotong Univ Inst Traff & Transportat Sichuan Peoples R China

This paper presents a mathematical model for two-stage planning of transportation and inventory for many sorts of products (multi-commodity). The situation considered in this paper, which happens in a local furniture manufacturing firm, is that the total supply in origins exceeds the current-stage's total demand from all destinations (markets). Therefore, the problem is how to arrange the current-stage's shipping in consideration of next-stage's (that is, future's) inventory in both origins and destinations. A mathematical model is proposed for the problem with the objective of minimizing the total cost of both shipping and inventory for all products within two stages. Meanwhile, since the next-stage's shipping costs usually are unknown, this paper presents a new concept of rational unit shipping cost: a forecasted average cost with weight of next-stage's shipping amount. Finally, a numerical example extracted from the furniture manufacturing company with 4 origins, 4 destinations and 4 commodities is illustrated in the paper. Significance: This paper presents a mathematical model for multi-commodity, two-stage transportation and inventory problem. The developed model is flexible for adjusting of the next-stage's shipping plan in accordance with the practical conditions at that time. It is also proved that many variables can be reduced by use of the rational unit shipping cost.

关键词： Transportation inventory network programming multi-commodity rational unit shipping cost

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Open Source Tool for networks Management Communication

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Journal of Electrical Engineering 2017年第1期5卷 35-46页

作者： Nuno Tiago Louro Simoes Carlos Manuel da Silva Rabadao School of Technology and Management Polytechnic Institute of Leiria Leiria Portugal Research Center for Informatics and Communications Polytechnic Institute of Leiria Leiria Portugal

Considering the complexity of the networks and the need for telecommunication operators （Telco） to present innovations to their clients, the quickest possible, one of the solutions for this complexity could be to centralize its configuration. Thus the SDN （software-defmed networking） concept may be an important solution. This paper suggests the implementation of a tool to support the development and testing of networks and services before they are put into production. The use of a tool that simplifies the configuration of a network service makes the networks and services to be less susceptible to errors and failures by those who set them up, thus allowing telecom operators, among others, to be able to create new services, improve the monitorization of their human resources and, above all, improve their fmancial results. In the end, success will be achieved because with a simple interaction and basic knowledge we are able to manage network services.

关键词： SDN network services network programming NSO.

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An Application of a Heuristic network Algorithm to Cable Logging Layout Design

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Journal of Forest Engineering 2004年第1期15卷 11-24页

This paper describes a method for optimizing cable logging layouts using a heuristic network algorithm. A timber harvest unit layout is formulated as a network problem. Each grid cell containing timber volume to be harvested is identified as an individual entry node of the network. Mill locations or proposed timber exit locations are identified as destinations. Each origin will then be connected to one of the destinations through alternative links representing alternative cable corridors, harvesting equipment, landing locations, and truck road segments. A heuristic algorithm for network programming is used to solve the cost minimization network problem. A computerized model has been developed to implement the method. Logging feasibility and cost analysis modules are included in the model in order to evaluate the logging feasibility of alternative cable corridors and estimate yarding and transportation costs. The model was successfully applied to a harvest planning area to generate harvesting plans. This case study indicates that the planning method is best used for pre-planning since modeling assumptions with respect to tail spar availability and unconstrained road alignments may require modification of the plan before implementation.

关键词： Forest operation planning cable logging forest road modeling optimization network programming

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LDAP programming with Java 1

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2000年

作者： Rob Weltman Tony Dahbura

ISBN: (纸本)9780201657586;0201657589

Lightweight Directory Access Protocol (LDAP) is now a staple of enterprise and Internet software environments. Anyone involved with Internet development, where Java(TM) technology is prominent, or in enterprise information systems must understand how to use Java technology--especially the Directory SDK for Java--in order to unlock the power of *** by the designer of the Directory SDK for Java and by a leading implementor of directory-based solutions,LDAP programming with Java(TM) is the first accurate, concise, and complete guide on accessing LDAP from Java applications. Assuming familiarity with Java programming, the book provides a comprehensive discussion of LDAP, from basic directory concepts to the most advanced techniques. It collects in one convenient resource the many innovative and experience-based techniques and approaches programmers have discovered for using the Directory SDK to solve LDAP access *** you are new to LDAP, you will find helpful background information about the role of directories in today's software systems; LDAP methods of storing, accessing, searching, and updating data; and how the Directory SDK for Java helps applications gain access to an LDAP server. Once you have become proficient with the essential concepts and techniques, you can move on to detailed material about authentication, LDAP and JavaScript(TM), working with JavaBeans(TM) for reusable LDAP components, expressing data relationships in a directory, and other advanced LDAP *** topics covered include: The LDAP naming and information models The command-line tools of the SDK Authentication with a password, SSL, and SASL Configuring access control Writing LDAP applets for a browser Accessing the SDK from JavaScript Storing configuration and preferences in a directory Encapsulating LDAP functionality in a JavaBean Using LDAP in Java servlets LDAP URLs Multiple threads and multiple connections Referrals and replicated systems LDAP controls Synchron

关键词： Enterprise networks network programming Protocols Standards - Computer networks Protocols Standards - Internet Java

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Pure Java Server Pages illustrated edition

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丛书名： Pure Series

2000年

作者： James Goodwill

ISBN: (纸本)9780672319020;0672319020

From the Publisher: Pure JSP gives a very concise conceptual overview of the JavaServer Pages technology and its related components. Once you have a firm foundation with the JSP technology, related topics such as JavaBeans, JDBC and Servlets are covered at a very high level. The book moves on to explain a large number of JSP techniques, which were determined by studying problems faced by JSP users in the professional world. The final section covers the more technical aspects of the JSP technology. Topics include related API's, server configuration, and charts and diagrams related to developing JSP applications.

关键词： network programming Web Application Development Java Web programming

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How To Do Everything with JavaScript 1

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丛书名： How to do everything with

2003年

作者： Scott Duffy

ISBN: (纸本)9780072228878;0072228873

This friendly, solutions-oriented guide is filled with step-by-step examples that illustrate how to write basic to advanced JavaScript applications, as well as modify existing scripts to suit individual needs. Each chapter begins with the specific how-to topics that will be covered. Within the chapter, each topic is accompanied by a solid, easy-to-follow walkthrough of the process. Table of contents Part I: Learn JavaScript Basics 1: Prepare to Program in JavaScript 2: Learn JavaScript Fundamentals 3: Use Built-in JavaScript Classes 4: Organize Data into Arrays 5: Create Your Own JavaScript Classes Part II: Build JavaScript-Enabled Web Sites 6: Embed JavaScript in a Web Page 7: Create Scripts That Work in Every Browser 8: Manipulate Web Forms 9: Handle Browser Events 10: Communicate Between Browser Frames 11: Interact with the Web Browser 12: Perform Simple Animation Part III: Take JavaScript to the Next Level 13: Debug JavaScript Programs 14: Make Your Program Errorproof 15: Use JavaScript to Manage Browser Plug-Ins A: HTML 4.01 Tags B: JavaScript Quick Reference

关键词： network programming General Web Site Design/Development Web Site Design Scripting Languages Web programming

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jQuery in Action 1

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2008年

作者： Bear Bibeault Yehuda Katz

ISBN: (纸本)9781933988351

A good web development framework anticipates what you need to do and makes those tasks easier and more efficient; jQuery practically reads your mind. Developers of every stripe-hobbyists and professionals alike-fall in love with jQuery the minute they've reduced 20 lines of clunky JavaScript into three lines of elegant, readable code. This new, concise JavaScript library radically simplifies how you traverse HTML documents, handle events, perform animations, and add Ajax interactions to your web pages. jQuery in Action, like jQuery itself, is a concise tool designed to make you a more efficient and effective web developer. In a short 300 pages, this book introduces you to the jQuery programming model and guides you through the major features and techniques you'll need to be productive immediately. The book anchors each new concept in the tasks you'll tackle in day-to-day web development and offers unique lab pages where you immediately put your jQuery knowledge to *** are dozens of JavaScript libraries available now, with major companies like Google, Yahoo and AOL open-sourcing their in-house tools. This book shows you how jQuery stacks up against other libraries and helps you navigate interaction with other tools and *** in Action offers a rich investigation of the up-and-coming jQuery library for client-side JavaScript. This book covers all major features and capabilities in a manner focused on getting the reader up and running with jQuery from the very first sections. Web Developers reading this book will gain a deep understanding of how to use jQuery to simplify their pages and lives, as well as learn the philosophy behind writing jQuery-enhanced pages.

关键词： network programming General Web Site Design/Development Scripting Languages Web programming

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