Alone Together: a Socio-Technical Theory of Motivation, Coordination and Collaboration Technologies in Organizing for Free and Open Source Software Development

Total Page:16

File Type:pdf, Size:1020Kb

Alone Together: a Socio-Technical Theory of Motivation, Coordination and Collaboration Technologies in Organizing for Free and Open Source Software Development Alone Together: A socio-technical theory of motivation, coordination and collaboration technologies in organizing for free and open source software development James Howison Abstract This dissertation presents evidence that the production of Free and Open Source Software (FLOSS) is far more alone than together; it is far more often individual work done \in company" than it is teamwork. When tasks appear too large for an individual they are more likely to be deferred until they are easier rather than be undertaken through teamwork. This way of organizing is successful because it fits with the motivations of the participants, the na- ture of software development as a task, and the key technologies of FLOSS collaboration. The empirical findings are important because they ground and motivate a theory that enables a systematic approach to understanding the implications of FLOSS development as a model for adaptation and the future of work. The dissertation presents a process of discovery (participant observa- tion), replication (a systematic study of project archives), and generalization to theory (a model of the rational choices of developers and an analysis of the flexibility of software as a task). The dissertation concludes by enumerating the conditions under which this theory of organizing is likely to be successful, such as non-revokable and rewindable work with incremental incentives. These are used as a framework to analyze efforts to adapt the FLOSS model of or- ganizing for self-organizing, virtual teams in other domains of work. Future developments of this dissertation, errata and discussion will be available at http://james.howison.name/pubs/dissertation.html. ALONE TOGETHER:A SOCIO-TECHNICAL THEORY OF MOTIVATION, COORDINATION AND COLLABORATION TECHNOLOGIES IN ORGANIZING FOR FREE AND OPEN SOURCE SOFTWARE DEVELOPMENT By James Howison B. Economics (Social Sciences) (Hons) University of Sydney 1998 DISSERTATION Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Information Science and Technology in the Graduate School of Syracuse University May 2009 Approved Professor Kevin Crowston Date Copyright c 2009 James Howison, Some Rights Reserved. Released under Creative Commons Attribution, Non-commercial, Share-Alike license, v3.0: http://creativecommons.org/licenses/by-nc-sa/3.0/us/ Attribution can be accomplished through regular academic citation or linking to http:// james.howison.name/publications/dissertation.html REPLACE WITH COMMITTEE APPROVAL PAGE Contents Contentsv I Introduction1 1 Background and Research Questions2 2 Literature Review I 15 II Research 29 3 Discovery: BibDesk Participant Observation 30 4 Literature Review II 63 5 Replication: Fire & Gaim Archive Study 81 6 Literature Review III 142 7 Formalization: An Explanatory Model 151 III Conclusions 195 8 Discussion 196 9 Conclusion 221 Bibliography And Appendices 229 Details of Illustrative Tasks 230 Bibliography 236 Biographical Data 248 v Part I Introduction 1 Chapter 1 Background and Research Questions What if you had to organize to not only do something great, but also to attract the very people you need to do those great things, without any money at all? How might that organizing|that way of working|look? A great deal of literature has studied the more common case of organization in which the future availability of resources is assumed. Teams are studied working, but only after their members are assigned; partnerships between businesses are studied after their members are engaged. Typically this assumption rests on the knowledge that participants are paid for their involvement and, quid pro quo, they offer their working time as a resource to be shaped by an active management seeking to improve the overall goal of organizational efficiency. Increasingly, however, the future of work seems unlikely to look like this. Simply offering money and then telling people what to do isn't always enough to attract the best and brightest, and even if they are attracted it might not be enough to hold onto them or to ensure that they do their best work. Skilled workers, especially in-demand knowledge workers, might be better understood and managed if they were perceived 2 CHAPTER 1. BACKGROUND AND RESEARCH QUESTIONS 3 as acting like volunteers (e.g. Handy, 1988; Malone, 2004; Cook, 2008; Barnard et al., 1968; Drucker, 2002). In some ways it has always been understood that people working together| seemingly without coercion|can do interesting, productive things, but these have been the exception rather than the rule, and have tended to be small-scale and small impact (like managing a local sporting league). Truly hard and important achieve- ments have been accomplished through organizational models with up-front financial investment, strategic planning and just the right amount of incentivized coercion, to ensure both effective and efficient collaboration. Recently, however, new forms of collaboration have emerged to great acclaim. Phenomena such as free and open source software development and Wikipedia suggest that new technologies are associated with new forms of organizing. Whether these are called \massive virtual collaboration" (Crowston and Fagnot, 2008), \private- collective innovation" (von Hippel and von Krogh, 2003), \wikinomics" (Tapscott and Williams, 2006) or even \crowd-sourcing" (Surowiecki, 2005; Howe, 2006), they suggest that there is something strikingly and importantly novel occurring. Yet the expectation that truly important things are not done by volunteers in their spare time is so persistent and pervasive, research ought to remain skeptical. This is perhaps doubly-true when claims are made that revolutionary technology lies at the bottom of such transcendence. The rhetorical record is rife with overblown claims about the revolutionary potential of new technologies and attendant claims of its universal and easy application (e.g. Marvin, 1988). Detailed studies reveal the relationship between technologies, organization and effective collaboration to be always much more complex, contingent and suspect (Orlikowski and Barley, 2002; Barley, 1986; Trist and Bamforth, 1951; Orlikowski, 1992). Nonetheless it is clear that something very interesting is happening around tech- nology supported open collaboration. Artifacts like the Linux operating system and CHAPTER 1. BACKGROUND AND RESEARCH QUESTIONS 4 Wikipedia are threatening long established ways of doing great things in the domains of software and documentation of knowledge. They have emerged from voluntary, non-coerced creative activity and have developed distinctive technologies to support their creation and dissemination. They are worthy of research both for their own sake and for the sake of lessons that might be learnt from them, both for organizational theory and practical application elsewhere. This dissertation explores these questions and this opportunity and builds an empirically grounded theory of organization in Free (Libre) and Open Source Software (FLOSS∗) projectsy. 1.1 Research Questions The purpose of this dissertation is to understand why the FLOSS model of organizing is successful and thereby provide a framework to discuss what can be adapted for ∗The software produced by these projects are generally available without charge (\free as in beer"). Some (though not all) open source software is also \free software", meaning that derivative works must be made available under the same license terms and therefore can never be made proprietary so they are \free as in speech" thus libre.. There are therefore two similar but distinct communities, the \open source" and the \free software" community. We have chosen to use the acronym FLOSS rather than OSS or even FOSS, to accommodate this range of meanings and respect the freedom (libre) connotation of free. Nevertheless, we have joined the two approaches for this research because their development practices are indistinguishable for the purposes of this dissertation. yThe organizational status of, or appropriate analogy for, FLOSS development projects is an interesting research question in its own right. Are they (or are they more like) teams, communities, organizations or groups? Some scholars use team to refer only to the core developers, and community to also include less active participants. Terminology is especially problematic because the notion and extent of the \teamness" of FLOSS production is central to this dissertation. Therefore we have chosen to use the term \project" because it is the term used by participants themselves and leaves the question for empirical data. CHAPTER 1. BACKGROUND AND RESEARCH QUESTIONS 5 other organizational environments. To structure this inquiry, there are three specific research questions, known throughout this dissertation as RQ1, RQ2 and RQ3. 1. How is successful FLOSS production organized? 2. How does this organization interact with the motivations of developers? 3. What are the implications for the adaptation of the FLOSS model of organiza- tion in other environments? This introductory chapter now turns to a more detailed introduction of the theo- retical and empirical justification for the proposed research, developing the research problem and describing the intended audiences for the work. The chapter then briefly examines ways to approach research on FLOSS development, making a practical and ethical argument for the methods used throughout this dissertation. The chapter ends with a short summary of the structure of the remainder of the dissertation. 1.2 Research Justification
Recommended publications
  • Secure Group Communication Responsible Beneficiary: UMU Contributing Beneficiaries: Estimated Indicative Person
    Ref. Ares(2016)35755 - 05/01/2016 Specific Targeted Research Projects (STReP) SOCIOTAL Creating a socially aware citizen-centric Internet of Things FP7 Contract Number: 609112 WP3 Privacy-aware communication Deliverable report Contractual date of delivery: 31/05/15 Actual submission date: Deliverable ID: D3.3 Deliverable Title: Secure Group Communication Responsible beneficiary: UMU Contributing beneficiaries: Estimated Indicative Person Months: Start Date of the Project: 1 September 2013 Duration: 36 Months Revision: Dissemination Level: Public PROPRIETARY RIGHTS STATEMENT This document contains information, which is proprietary to the SOCIOTAL Consortium. Neither this document nor the information contained herein shall be used, duplicated or communicated by any means to any third party, in whole or in parts, except with prior written consent of the SOCIOTAL consortium. FP7 Contract Number: 609112 Deliverable report – WP3 / D3.3 Document ID: D3.3 Document Information Document ID: D3.3 Version: 0.6 Version Date: 05/06/2015 Authors: José Luis Hernández Ramos, Jorge Bernal Bernabé, Antonio Skarmeta Gómez (UMU), Ignacio Elicegui Maestro (UC), Carmen López (UC), Michele Nati (UNIS), Christine Hennebert, Benoît Denis, Iulia Tunaru (CEA) Security: Confidential Approvals Name Organization Date Visa Project Management Klaus Moessner UNIS Team Document history Revision Date Modification Authors 0.1 03/03/2015 First ToC UMU 0.2 13/03/2015 Updated ToC, first responsibilities assignments UMU, UC, UNIS, CEA Contributions and improvements added to different 0.3 08/05/2015 UMU, UC, UNIS, CEA sections Contributions and improvements added to different 0.4 14/05/2015 UMU, UC, UNIS, CEA sections Contributions and improvements added to different 0.5 25/05/2015 UMU, UC, UNIS, CEA sections.
    [Show full text]
  • On OSCAR File Transfers
    On Sending Files via OSCAR Google Summer of Code 2005 Gaim Project By Jonathan Clark On Sending Files via OSCAR Table of Contents Introduction................................................................................................................................................3 Contact Information.............................................................................................................................. 3 Acknowledgments.................................................................................................................................3 Who Should Read This..........................................................................................................................3 Background........................................................................................................................................... 3 Overview............................................................................................................................................... 4 Recommended Tools.............................................................................................................................4 Example Implementations.....................................................................................................................4 Conventions...........................................................................................................................................4 Data Structures...........................................................................................................................................5
    [Show full text]
  • Teacher Manual
    Language Learning with Certified Live Online Language Teachers Swertz, Christian; Motteram, Gary; Philp, Heike; Sanhil Gonöl, Serpil (Hrsg.) Teacher Manual This project has been funded with support from the European Commission. This publication reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein. Content Page 2 1 Content 1 Content 2 2 LANCELOT General Introduction 5 2.1 General Introduction ........................................................................................................................................................ 5 2.2 Development Portfolio .................................................................................................................................................... 6 3 Learning Block 1 8 3.1 Introduction to Learning Block 1 .................................................................................................................................... 8 3.2 Lesson Observation 1 ...................................................................................................................................................... 9 3.3 Becoming a Live Online Language Teacher ................................................................................................................. 10 3.4 Icebreakers in Language Learning ................................................................................................................................ 11 3.5 Intercultural Communicative Competence
    [Show full text]
  • PGP® Desktop 9.9 for Windows User's Guide
    PGP® Desktop 9.9 for Windows User's Guide Version Information PGP Desktop for Windows User's Guide. PGP Desktop Version 9.9.1. Released November 2008. Copyright Information Copyright © 1991–2008 by PGP Corporation. All Rights Reserved. No part of this document can be reproduced or transmitted in any form or by any means, electronic or mechanical, for any purpose, without the express written permission of PGP Corporation. Trademark Information PGP, Pretty Good Privacy, and the PGP logo are registered trademarks of PGP Corporation in the US and other countries. IDEA is a trademark of Ascom Tech AG. Windows and ActiveX are registered trademarks of Microsoft Corporation. AOL is a registered trademark, and AOL Instant Messenger is a trademark, of America Online, Inc. Red Hat and Red Hat Linux are trademarks or registered trademarks of Red Hat, Inc. Linux is a registered trademark of Linus Torvalds. Solaris is a trademark or registered trademark of Sun Microsystems, Inc. AIX is a trademark or registered trademark of International Business Machines Corporation. HP-UX is a trademark or registered trademark of Hewlett-Packard Company. SSH and Secure Shell are trademarks of SSH Communications Security, Inc. Rendezvous and Mac OS X are trademarks or registered trademarks of Apple Computer, Inc. All other registered and unregistered trademarks in this document are the sole property of their respective owners. Licensing and Patent Information The IDEA cryptographic cipher described in U.S. patent number 5,214,703 is licensed from Ascom Tech AG. The CAST-128 encryption algorithm, implemented from RFC 2144, is available worldwide on a royalty-free basis for commercial and non-commercial uses.
    [Show full text]
  • Instant Messaging Security
    www.dbebooks.com - Free Books & magazines Instant Messaging Security Computer Security and Computer Forensic Related Book Titles: Casey, Handbook of Computer Crime Investigation, ISBN 0-12-163103-6, 448pp, 2002. Kovacich, The Information Systems Security Officer’s Guide, ISBN 0-7506-7656-6, 361pp, 2003. Boyce & Jennings, Information Assurance, ISBN 0-7506-7327-3, 261pp, 2002. Stefanek, Information Security Best Practices: 205 Basic Rules, ISBN 0-878707-96-5, 194pp, 2002. De Clercq, Windows Server 2003 Security Infrastructures: Core Security Features, ISBN 1-55558-283-4, 752pp, 2004. Rittinghouse, Wireless Operational Security, ISBN 1-55558-317-2, 496pp, 2004. Rittinghouse & Hancock, Cybersecurity Operations Handbook, ISBN 1-55558-306-7, 1336pp, 2003. Ransome & Rittinghouse, VoIP Security, ISBN 1-55558-332-6, 450pp, 2005. Speed & Ellis, Internet Security, ISBN 1-55558-298-2, 398pp, 2003. Erbschloe, Implementing Homeland Security for Enterprise IT, ISBN 1-55558-312-1, 320pp, 2003. Erbschloe, Physical Security for IT, ISBN 1-55558-327-X, 320pp, 2005. XYPRO, HP NonStop Server Security, ISBN 1-55558-314-8, 618pp, 2003. For more information, visit us on the Web at http://books.elseiver.com/. Computer Security and Computer Forensic Related Products: Newsletters and Journals from Elsevier: Digital Investigation – New in 2004 Edited by Eoghan Casey, this new peer reviewed journal focuses on best practice, new developments and proven methodologies in the field of digital forensic science. For further information, please visit: http://www.compseconline.com/digitalinvestigation/ • Biometric Technology Today • Card Technology Today • Computer Fraud & Security • Computer Law and Security Report • Computers & Security • Information Security Technical Report • Network Security • Infosecurity Today For more information, visit us on the Web at http://www.compseconline.com/.
    [Show full text]
  • Moderne Instant-Messaging-Systeme Als Plattform Für Sicherheitskritische Kollaborative Anwendungen
    Fachbereich 4: Informatik Moderne Instant-Messaging-Systeme als Plattform für sicherheitskritische kollaborative Anwendungen Dissertation zur Erlangung des akademischen Grades eines Doktors der Naturwissenschaften (Doctor rerum naturalium) vorgelegt von Dipl.-Informatikerin Anastasia Meletiadou Gutachter: Prof. Dr. Rüdiger Grimm und Prof. Dr. J. Felix Hampe Inhaltsverzeichnis 3 Inhaltsverzeichnis Abbildungsverzeichnis ...................................................................................................... 8 Teil I Einleitung und Problemdefinition ....................................................................... 14 1 Einleitung ............................................................................................. 14 2 Motivation ............................................................................................ 15 3 Herausforderungen und Ziele ............................................................ 16 3.1 Problemstellung ................................................................................................ 16 3.2 Fragestellung ..................................................................................................... 17 3.3 Methode ............................................................................................................ 17 4 Eigener Beitrag und Struktur der Arbeit ......................................... 19 Teil II Stand der Forschung und Related Work .......................................................... 22 5 Begriffsklärung ...................................................................................
    [Show full text]
  • An Analysis of Instant Messaging and E- Mail Access Protocol Behavior in Wireless Environment
    An Analysis of Instant Messaging and E- mail Access Protocol Behavior in Wireless Environment IIP Mixture Project Simone Leggio Tuomas Kulve Oriana Riva Jarno Saarto Markku Kojo March 26, 2004 University of Helsinki - Department of Computer Science i TABLE OF CONTENTS 1 Introduction ..................................................................................................................................... 1 PART I: BACKGROUND AND PROTOCOL ANALYSIS ............................................................. 1 2 Instant Messaging............................................................................................................................ 1 3 ICQ.................................................................................................................................................. 3 3.1 Overview ................................................................................................................................. 3 3.2 Protocol Operation .................................................................................................................. 4 3.2.1 Client to Server................................................................................................................4 3.2.2 Client to Client ................................................................................................................5 3.2.3 Normal Operation............................................................................................................ 5 3.2.4 Abnormal Operation.......................................................................................................
    [Show full text]
  • Scriptie: Collaboration Met Instant Messaging Afstudeerproject 2009 Afstudeerder: Menno Van Wieringen (1520398) Eerste Examinator: Jan Mooij 1‐9‐2009 Tot 15‐12‐2009
    SOGETI NEDERLAND B.V. & HOGESCHOOL UTRECHT Scriptie: Collaboration met Instant Messaging Afstudeerproject 2009 Afstudeerder: Menno van Wieringen (1520398) Eerste Examinator: Jan Mooij 1‐9‐2009 tot 15‐12‐2009 Collaboration met behulp van Instant Messaging. Hoe kan dit mogelijk gemaakt worden? 1 Voorwoord Dit document is een resultaat van het afstudeerproject van de heer M. van Wieringen. In dit project is een onderzoek uitgevoerd naar de mogelijkheden om verschillende Instant Messaging omgevingen aan elkaar te koppelen, dit om Collaboration via Instant Messaging mogelijk te maken. Graag bedank ik hierbij de volgende mensen voor hun ondersteuning tijdens het project: • Jan Mooij, Docent Hogeschool Utrecht; • Jeroen Pruissen, Unitmanager Sogeti; • Ron Moerman, Technology Officer Sogeti; 2 Managementsamenvatting 2.1 Probleemomschrijving De probleemstelling van het project is: Instant Messaging wordt een steeds belangrijker communicatiemiddel. Door de vele verschillende platformen en protocollen is het maken van een koppeling tussen verschillende Instant Messaging omgevingen niet mogelijk of slechts in beperkte mate. 2.2 Opdrachtomschrijving De opdracht voor het afstudeerproject is: het onderzoeken van de mogelijkheden om verschillende Instant Messaging omgevingen aan elkaar te koppelen. Bij het koppelen van Instant Messaging omgevingen moet er rekening gehouden worden met verschillende platformen, protocollen en locaties. Het onderzoek moet een goed beeld geven van Instant Messaging en van de manieren om koppelingen te maken tussen Instant Messaging omgevingen. 2.3 Doelstelling project De doelstellingen van het project zijn: een goed beeld te geven van Instant Messaging en de mogelijkheden om verschillende Instant Messaging omgevingen aan elkaar te koppelen. Het verhaal moet een goed beeld geven van de verschillende mogelijkheden en goede voorbeelden geven over hoe koppelingen gerealiseerd kunnen worden.
    [Show full text]
  • Unsecured Sessions with ICQ - Applying Forensic Computing
    Master Thesis Computer Science Thesis no: MCS-2003-04 June 2003 Unsecured sessions with ICQ - applying forensic computing Martin Kling Department of Software Engineering and Computer Science Blekinge Institute of Technology Box 520 SE – 372 25 Ronneby Sweden This thesis is submitted to the Department of Software Engineering and Computer Science at Blekinge Institute of Technology in partial fulfillment of the requirements for the degree of Master of Science in Computer Science. The thesis is equivalent to 20 weeks of full time studies. Contact Information: Author: Martin Kling Address: Fältv 17 SE-291 39 Kristianstad E-mail: [email protected] Phone: +46733691999 External advisor: Tony Möörk Swedish National Criminal Investigation Department Information Technology Crime Squad P.O Box 12256 SE-102 26 Stockholm Sweden Phone: +46 8 401 48 41 University advisor: Ph.D. Bengt Carlsson Department of Software Engineering and Computer Science Department of Software Engineering and Computer Science Internet: www.bth.se/ipd Blekinge Institute of Technology Phone: +46 457 38 50 00 Box 520 Fax: + 46 457 271 25 SE – 372 25 Ronneby Sw eden ii Abstract Digital evidence is becoming more and more frequent and important in investigations carried out by the police. To make the correct judgements, the police force needs to know what one can do with ICQ and in what ways it can be exploited. This thesis aims to point out weaknesses in ICQ that can aid the police in their work. But these weaknesses can not only be used by the police, also crackers can perform malicious acts with them. Therefore, I investigated if the use of ICQ resulted in non-secure sessions.
    [Show full text]
  • PULSAR: Stateful Black-Box Fuzzing of Proprietary Network Protocols
    PULSAR: Stateful Black-Box Fuzzing of Proprietary Network Protocols Hugo Gascon, Christian Wressnegger, Fabian Yamaguchi, Daniel Arp, and Konrad Rieck Computer Security Group University of Gottingen¨ {hgascon,christian.wressnegger,fabian.yamaguchi, darp,konrad.rieck}@uni-goettingen.de Abstract. The security of network services and their protocols critically depends on minimizing their attack surface. A single flaw in an implementation can suffice to compromise a service and expose sensitive data to an attacker. The discovery of vulnerabilities in protocol implementations, however, is a challenging task: While for standard protocols this process can be conducted with regular techniques for auditing, the situation becomes difficult for proprietary protocols if neither the program code nor the specification of the protocol are easily accessible. As a result, vulnerabilities in closed-source implementations can often remain undiscovered for a longer period of time. In this paper, we present PULSAR, a method for stateful black-box fuzzing of proprietary network protocols. Our method combines con- cepts from fuzz testing with techniques for automatic protocol reverse engineering and simulation. It proceeds by observing the traffic of a proprietary protocol and inferring a generative model for message formats and protocol states that can not only analyze but also simulate communication. During fuzzing this simulation can effectively explore the protocol state space and thereby enables uncovering vul- nerabilities deep inside the protocol implementation. We demonstrate the efficacy of PULSAR in two case studies, where it identifies known as well as unknown vulnerabilities. Key words: Model-based Fuzzing, Vulnerability Discovery, Protocol Reverse Engineering 1 Introduction A myriad of network services and protocols is employed in today’s computer networks, ranging from classic protocols of the Internet suite to proprietary binary protocols implemented only by particular vendors.
    [Show full text]
  • Pidgin Security and Bug Fix Update (RHSA-2009-1139)
    pidgin security and bug fix update (RHSA-2009-1139) Original Release Date: July 2, 2009 Last Revised: July 2, 2009 Number: ASA-2009-261 Risk Level: Low Advisory Version: 1.0 Advisory Status: Final 1. Overview: Pidgin is an instant messaging program which can log in to multiple accounts on multiple instant messaging networks simultaneously. The AOL Open System for Communication in Realtime (OSCAR) protocol is used by the AOL ICQ and AIM instant messaging systems. A denial of service flaw was found in the Pidgin OSCAR protocol implementation. If a remote ICQ user sent a web message to a local Pidgin user using this protocol, it would cause excessive memory usage, leading to a denial of service (Pidgin crash). The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2009-1889 to this issue. More information about these vulnerabilities can be found in the security advisory issued by RedHat Linux: · https://rhn.redhat.com/errata/RHSA-2009-1139.html 2. Avaya System Products using RHEL4 or RHEL5 with pidgin installed: Affected Risk Product: Actions: Version(s): Level: Avaya Intuity 2.0, 2.0 SP1, 2.0 This advisory will not be addressed Low AUDIX LX SP2 by Intuity AUDIX LX. 3. Avaya Software-Only Products: Avaya software-only products operate on general-purpose operating systems. Occasionally vulnerabilities may be discovered in the underlying operating system or applications that come with the operating system. These vulnerabilities often do not impact the software-only product directly but may threaten the integrity of the underlying platform. In the case of this advisory Avaya software-only products are not affected by the vulnerability directly but the underlying Linux platform may be.
    [Show full text]
  • Image and Medical Data Communication Protocols for Telemedicine and Teleradiology
    Image and Medical Data Communication Protocols for Telemedicine and Teleradiology Dissertation vom Fachbereich Informatik der Technischen Universität Darmstadt zur Erlangung des akademischen Grades eines Doktor der Ingenieurwissenschaften (Dr.-Ing.) genehmigte Dissertation von Dipl.-Phys. Ilias Sachpazidis aus Mesolongi, Griechenland Referenten der Arbeit: Prof. Dr.-Ing. Dr. h.c. Dr. Eh J. L. Encarnação Prof. Dr.-Ing. Georgios Sakas Tag der Einreichung: 10 July 2008 Tag der mündlichen Prüfung: 24 September 2008 Darmstadt 2008 - D17 Image and Medical Data Communication Protocols for Telemedicine and Teleradiology For further information about this publication, please contact Department of Cognitive Computing and Medical Imaging Fraunhofer Institute for Computer Graphics Fraunhoferstr. 5 D-64283, DARMSTADT GERMNAY phone: +49-6151-155 507 fax: +49-6151-155-480 e-mail: [email protected] homepage: http://www.igd.fhg.de/˜isachpaz to my dad and mom. iii Contents Acknowledgments xv Abstract xvii 1 Introduction 1 1.1 Motivation . 1 1.2 Current Problems . 2 1.3 Topic and structure . 3 1.4 Main results . 5 2 State-of-the-art 7 2.1 Telemedicine taxonomy . 7 2.2 Telemedicine protocols . 8 2.3 Telemedicine devices . 9 2.4 Telemedicine applications . 14 2.5 Data types and volumes . 25 2.5.1 Communication pathways . 26 2.5.2 Size of medical data . 28 2.5.3 Bandwidth requirements . 28 2.6 Conclusions . 28 3 Integrated protocols for data and imaging exchange 33 3.1 Introduction . 33 3.2 Binary transmission . 36 3.2.1 Out-Of-Band data transmission . 36 3.2.2 In-Band-Data Transmission . 36 3.3 In-Band-Data protocol extension .
    [Show full text]