In this thesis, we address the problem of service function chaining in a network. Currently, problems of chaining services in a network (i.e. service function chaining) can be broadly categorised into middlebox placement in a network and packet steering through middleboxes. In this work, we present a packet steering approach - One Pass Packet Steering (OPPS) - for use in multi-subscriber environments, with the aim that subscribers having similar policy chain composition should experience the same network performance. We develop and show algorithms with a proof of concept implementation using emulations performed with Mininet. We identify challenges and examine how OPPS could benefit from the Software Defined Data Center architecture to overcome these challenges. Our results show that, given a fixed topology and different sets of policy chains containing the same middleboxes, the end-to-end delay and throughput performance of subscribers using similar policy chains remains approximately the same. Also, we show how OPPS can use a smaller number of middleboxes and yet, achieve the same hop count as that of a reference model described in a previous work as ideal, without violating the subscribers' policy chains.

Examensarbetet är bland annat ett förslag med hållbara riktlinjer för hur planering av en pendlarnod kan gå till samt identifikation av generella servicefunktioner som bör finnas hos en pendlarnod. Arbetet grundas i den ökande användningen av bilen gentemot val av hållbara färdmedel i form av gång-, cykel- och kollektivtrafik. En viktig aspekt i planeringen av pendlarnoder är stadskärnornas attraktivitet samt sammankopplingen mellan landsbygd och tätort. Om bilens framkomlighet begränsas kan hållbart resande gynnas och på så sätt sammankoppla Sveriges vägnät med bättre förbindelser. Förslaget är till för att underlätta för framtida stads- och trafikplanering i Sveriges tätorter. Studien grundas på vad andra städer har gjort för att öka det hållbara resandet. Resultaten visar att genom att placera pendlarnoder i utkanten av Växjö minskas bilanvändningen i centrum och främjar istället människans hälsa och välbefinnande. Pendlarnoderna är även en förutsättning för att alla människor ska ha möjlighet att kunna ta sig till fritidsaktiviteter, arbete och studier oavsett vart de bor. Samtidigt frigörs stora ytor i centrum som kan utformas till gröna områden som uppmuntrar till en mer levande stad och fysisk aktivitet för människorna som bor i den. En pendlarnods attraktion ökar i takt med vad den kan erbjuda. Genom att erbjuda ett utbud av funktioner, tjänster och upplevelser under samma tak kan attraktionen av det hållbara resandet öka i Sveriges tätorter. / This work including a proposal with sustainable guidelines on how to plan a commuter node, as well as identification of general service functions that should be available. The work is based on the increasing use of cars against choice of sustainable transport in the form of pedestrian, bicycle and public transport. An important part of the planning of the commuter hubs is the attractiveness of the city center as well as the interconnection between countryside and urban areas. If the cars accessibility is limited, sustainable travel can benefit and thus better link Sweden’s road network with better connections. This proposal will make urban and traffic planning easier. The study is based on what other cities have done in the past to encourage sustainable travel, use of proven analytical methods and interviews with expert and potential users. The result shows that by placing commuter nodes on the edge of Växjö, car use is reduced in the center and instead promotes human health and well-being. The commuter nodes are also a prerequisite for all people to have the opportunity to access leisure activities, work and studies wherever they live. At the same time, large areas in the center are released, which can be designed into green areas that encourage a more vibrant city and physical activity for people living in it. A commuter node's attraction increases as it can offer. Being able to offer a range of functions, services and experiences is a connection between public transport and land value.

Text in Afrikaans / Die doel van die studie was om 'n model te ontwikkel vir openbare bibiioteekdiensiewering in 'n ontwikkelende land met 'n multikulturele samelewing. Die kernprobleem was om die teoretiese fundering van dienslewering en die toepassing daarvan in die praktyk te ondersoek. Die eerste subprobleem was om die eienskappe van 'n professie en professionele dienslewering te ondersoek. Die eienskappe van die professionalis/bibiiotekaris wat leiding aan die gebruiker moet gee, is geidentifiseer. Sleutelelemente is: outonomie (gekoppel aan deskundigheid en opieiding), 'n altruistiese diensorientasie en funksionele diens (volgens professionele riglyne en standaarde) aan alle groepe in die gemeenskap, ongeag sosiale kias. Die tweede subprobleem was om die doelstellings en funksies van die openbare biblioteek en die roi van gebruikersleiding daarin te ontleed. Daar is gevind dat diensleweringsfunksies in die teorie swak gefundeer is. 'n Kategorisering is voorgestel wat onderskei tussen ondersteuningsfunksies, diensleweringsfunksies en bestuursfunksies. Gebruikersleiding is geidentifiseer as oorkoepelende begrip en kernelement van alle diensleweringsfunksies wat gerig is op die optimalisering van die waarde van inligting tot beswil van die samelewing. Die derde subprobleem was om die ontstaan van 'n diensbegrip in die openbare biblioteek te beskryf en paradigmaverskuiwings uit te wys. Professionele riglyne, beginsels en standaarde, is ontleed. Afleidings is gemaak oor 'n heersende diensbegrip en rol van die openbare biblioteek. Daar is bevind dat die riglyne vir die identifisering van gebruikersgroepe en hulle behoeftes asook diensleweringsfunksies ontoereikend is. 'n Kategorisering van potensiele gebruikersgroepe en hul behoeftes is gedoen en 'n model vir openbare biblioteekdiensiewering ontwikkel om die leemte in teoretisering te vul. Die model onderskei 'n diensparadigma van dienslewering aan alie individue en groepe in die gemeenskap en missie van ontwikkeling; die primere doeiltelling opvoeding; beginsels van gemeenskapskontak; behoeftebepaling en toegang lot inligting; diensfunksies en uitreikaktiwiteite; die professionalis-klientverhouding; wetgewing, organisatoriese strukture en omgewingsfaktore. Die model is in 'n vraelysopname in die Suid-Afrikaanse openbare biblioteekpraktyk getoets. Daar is bevind dat die doelsteliings nagestreef en diensfunksies toegepas word. Die grootste probleme word in organisatoriese strukture en finansiering ondervind. Hierdie sake moet dringend aandag kry om die gestelde missie, naamlik om 'n wesenlike rol te speel in die ontwikkeling van die hele Suid-Afrikaanse samelewing, te verwesenlik. / The purpose of the study was to develop a model for public library service rendering in a developing and multicultural society. The core problem was to investigate the theoretical foundation of service rendering and the application thereof in practice. The first subproblem was to examine the characteristics of a profession and professional service rendering. The characteristics of the professional/ librarian who has to provide guidance to the user were identified. Key elements are: autonomy (linked to expertise and training), an altruistic service orientation and functional service (according to professional guidelines and standards) to all groups in the community irrespective of social class. The second subproblem was to analyse the aims and functions of the public library and the role of user guidance in it It was found that service rendering functions are not theoretically well grounded. A categorisation is proposed which distinguishes between supporting, service rendering and management functions. User guidance is identified as an umbrella concept and core element of all service rendering functions which is directed at optima/isirtg the value of information to the benefit of society. The third subproblem was to describe the origins of a service concept in the public library and to expose paradigm shifts. Professional guidelines, principles and standards were analysed. Conclusions were drawn about a predominant service concept and the role of the public library. It was found that guidelines for the identification of user groups and their needs as well as service rendering functions are inadequate. A categorisation of potential user groups and their needs was compiled and a model for public library service rendering was developed to bridge the gap in XXtheorisation. The model distinguishes a paradigm of service to all Individuals and groups in the community and a developmental mission; the primary aim of education; service principles of community networking, needs assessment and information access; service functions and outreach activities; the professionalclient- relationship; legislation, organisational structures and environmental factors. The model was tested in South African public library practice by means of a questionnaire survey. It was found that aims are pursued and service functions are applied. The greatest problems are experienced In organisational structures and financing. These issues must be urgently addressed to realise the public library's declared mission, namely to play a substantial role in the development of the South African society as a whole. / Information Science / D. Litt. et Phil. (Information Science)

Text in Afrikaans / Die doel van die studie was om 'n model te ontwikkel vir openbare bibiioteekdiensiewering in 'n ontwikkelende land met 'n multikulturele samelewing. Die kernprobleem was om die teoretiese fundering van dienslewering en die toepassing daarvan in die praktyk te ondersoek. Die eerste subprobleem was om die eienskappe van 'n professie en professionele dienslewering te ondersoek. Die eienskappe van die professionalis/bibiiotekaris wat leiding aan die gebruiker moet gee, is geidentifiseer. Sleutelelemente is: outonomie (gekoppel aan deskundigheid en opieiding), 'n altruistiese diensorientasie en funksionele diens (volgens professionele riglyne en standaarde) aan alle groepe in die gemeenskap, ongeag sosiale kias. Die tweede subprobleem was om die doelstellings en funksies van die openbare biblioteek en die roi van gebruikersleiding daarin te ontleed. Daar is gevind dat diensleweringsfunksies in die teorie swak gefundeer is. 'n Kategorisering is voorgestel wat onderskei tussen ondersteuningsfunksies, diensleweringsfunksies en bestuursfunksies. Gebruikersleiding is geidentifiseer as oorkoepelende begrip en kernelement van alle diensleweringsfunksies wat gerig is op die optimalisering van die waarde van inligting tot beswil van die samelewing. Die derde subprobleem was om die ontstaan van 'n diensbegrip in die openbare biblioteek te beskryf en paradigmaverskuiwings uit te wys. Professionele riglyne, beginsels en standaarde, is ontleed. Afleidings is gemaak oor 'n heersende diensbegrip en rol van die openbare biblioteek. Daar is bevind dat die riglyne vir die identifisering van gebruikersgroepe en hulle behoeftes asook diensleweringsfunksies ontoereikend is. 'n Kategorisering van potensiele gebruikersgroepe en hul behoeftes is gedoen en 'n model vir openbare biblioteekdiensiewering ontwikkel om die leemte in teoretisering te vul. Die model onderskei 'n diensparadigma van dienslewering aan alie individue en groepe in die gemeenskap en missie van ontwikkeling; die primere doeiltelling opvoeding; beginsels van gemeenskapskontak; behoeftebepaling en toegang lot inligting; diensfunksies en uitreikaktiwiteite; die professionalis-klientverhouding; wetgewing, organisatoriese strukture en omgewingsfaktore. Die model is in 'n vraelysopname in die Suid-Afrikaanse openbare biblioteekpraktyk getoets. Daar is bevind dat die doelsteliings nagestreef en diensfunksies toegepas word. Die grootste probleme word in organisatoriese strukture en finansiering ondervind. Hierdie sake moet dringend aandag kry om die gestelde missie, naamlik om 'n wesenlike rol te speel in die ontwikkeling van die hele Suid-Afrikaanse samelewing, te verwesenlik. / The purpose of the study was to develop a model for public library service rendering in a developing and multicultural society. The core problem was to investigate the theoretical foundation of service rendering and the application thereof in practice. The first subproblem was to examine the characteristics of a profession and professional service rendering. The characteristics of the professional/ librarian who has to provide guidance to the user were identified. Key elements are: autonomy (linked to expertise and training), an altruistic service orientation and functional service (according to professional guidelines and standards) to all groups in the community irrespective of social class. The second subproblem was to analyse the aims and functions of the public library and the role of user guidance in it It was found that service rendering functions are not theoretically well grounded. A categorisation is proposed which distinguishes between supporting, service rendering and management functions. User guidance is identified as an umbrella concept and core element of all service rendering functions which is directed at optima/isirtg the value of information to the benefit of society. The third subproblem was to describe the origins of a service concept in the public library and to expose paradigm shifts. Professional guidelines, principles and standards were analysed. Conclusions were drawn about a predominant service concept and the role of the public library. It was found that guidelines for the identification of user groups and their needs as well as service rendering functions are inadequate. A categorisation of potential user groups and their needs was compiled and a model for public library service rendering was developed to bridge the gap in XXtheorisation. The model distinguishes a paradigm of service to all Individuals and groups in the community and a developmental mission; the primary aim of education; service principles of community networking, needs assessment and information access; service functions and outreach activities; the professionalclient- relationship; legislation, organisational structures and environmental factors. The model was tested in South African public library practice by means of a questionnaire survey. It was found that aims are pursued and service functions are applied. The greatest problems are experienced In organisational structures and financing. These issues must be urgently addressed to realise the public library's declared mission, namely to play a substantial role in the development of the South African society as a whole. / Information Science / D. Litt. et Phil. (Information Science)