This thesis is focused on extension of MPKT 2008 communication protocol. It has been made analysis of this protocol version and proposals to improve and extend this version with other options have been raised. It has been created a new version of the protocol on the basis of the proposals. Then the .NET platform has been presented and its architecture has been described. The C# language available on the .NET platform has been chosen to implement the new protocol version and its facilities for network communication and threading have been described. It has been said an assessment of the application of this programming language in practical lessons. A proposal to update tutorial texts has been made.

This thesis aims to explore the role of social network in the international market for the companies that plan to test their capabilities of social network for enhancement of business. In order to explore such capabilities, LinkedIn, Facebook, twitter and other social networks have been considered as examples, using companies from three different countries France, China and India. The findings highlight the social network contributing the acceleration of internationalization process and cost reduction. The methodology is used for assessing its relevance of moving internationally by the firms and assessment in the initial phase of implementation. However, its relevance is bigger in advanced stage of the implementation process. LinkedIn, Facebook, twitter can be obtained by new firms to obtain several benefits such as brand awareness and exploring new opportunities, customer retention and few other factors. This study results in providing complete knowledge to those companies or new startups that plan to move into international market after being into the business for few years locally.

As novas dinâmicas de interação possiblitadas pela Web 2.0 reformulam a aprendizagem como atividade que se estende a diversas áreas ligadas ao saber. Aprender à luz das novas tecnologias exige estratégias que se adequem às possibilidades de interação com a informação, conforme particularidades das mídias em que elas se fazem disponíveis, as particularidades de aprendizagem de cada indivíduo e o contexto que determina necessidades de acesso. Educadores, designers instrucionais / educacionais e estrategistas de conteúdo revisam, invariavelmente, processos para melhor compreender os mecanismos pelos quais informação é transformada em conhecimento. Esses estão aptos a interpretar os métodos pelos quais indivíduos processam informação e apropriam conteúdos de origens variadas em uma prática que podemos chamar aprendizagem ou meaning making. Nesse contexto, surge o conceito de narrativas transmidiáticas, capaz de abarcar as práticas de aprendizagem que, multifacetadas, são possibilitadas pelos recursos midiáticos que compõem nosso cotidiano. A construção de significado se dá na medida em que construímos narrativas, linhas mestras coerentes que nos permitem interagir de forma eficiente com os diferentes conteúdos aos quais temos acessos. Esse trabalho investigou o conceito de narrativa e o impacto da utilização de mídias na forma de interagir com os outros e, também, com o conhecimento; a aprendizagem no contexto das narrativas transmidiáticas; dois exemplos concretos e distintos em que aprende-se através de narrativas construídas a partir do uso combinado de mídias. Por fim, buscou-se apontar novos caminhos a serem explorados por pesquisadores interessados na forma como aprendizagem e comunicação se dão em um contexto caracterizado pelas mídias digitais. / The new dynamics empowered by web 2.0 reframes learning as an activity that permeates different areas of knowledge. In the light of new technologies, the goal of reaching a certain knowledge demands adequate strategies. These must be appropriate to the various possibilities of interaction with information, according to media\'s affordances, individual\'s learning particularities and the context that determined individual necessities of access. Educators, educational / instructional designers and content strategists invariably revise procedures to better understand the mechanics through which information is turned into knowledge. These professionals are able to understand the methods through which individuals process information and appropriate content from different resources in a practice that we can call learning or meaning making. In this context, appears the term transmedia narratives: a concept that encompasses plural learning practices enabled by media resources that compose our reality. Meaning making happens as we build narratives, coherent guidelines that empower ourselves to interact efficiently with the different types of content we have access to. This study investigated the concept of narrative and the impact of media in our ways to interact with others and with knowledge; learning in the context of transmedia narratives; two concrete and distinct examples in which one learn through narratives built with the use of various combined media. Finally, this study aimed to indicate new research pathways to be explored by researchers interested in the way learning and communication happen in a context determined by the digital media.

As novas dinâmicas de interação possiblitadas pela Web 2.0 reformulam a aprendizagem como atividade que se estende a diversas áreas ligadas ao saber. Aprender à luz das novas tecnologias exige estratégias que se adequem às possibilidades de interação com a informação, conforme particularidades das mídias em que elas se fazem disponíveis, as particularidades de aprendizagem de cada indivíduo e o contexto que determina necessidades de acesso. Educadores, designers instrucionais / educacionais e estrategistas de conteúdo revisam, invariavelmente, processos para melhor compreender os mecanismos pelos quais informação é transformada em conhecimento. Esses estão aptos a interpretar os métodos pelos quais indivíduos processam informação e apropriam conteúdos de origens variadas em uma prática que podemos chamar aprendizagem ou meaning making. Nesse contexto, surge o conceito de narrativas transmidiáticas, capaz de abarcar as práticas de aprendizagem que, multifacetadas, são possibilitadas pelos recursos midiáticos que compõem nosso cotidiano. A construção de significado se dá na medida em que construímos narrativas, linhas mestras coerentes que nos permitem interagir de forma eficiente com os diferentes conteúdos aos quais temos acessos. Esse trabalho investigou o conceito de narrativa e o impacto da utilização de mídias na forma de interagir com os outros e, também, com o conhecimento; a aprendizagem no contexto das narrativas transmidiáticas; dois exemplos concretos e distintos em que aprende-se através de narrativas construídas a partir do uso combinado de mídias. Por fim, buscou-se apontar novos caminhos a serem explorados por pesquisadores interessados na forma como aprendizagem e comunicação se dão em um contexto caracterizado pelas mídias digitais. / The new dynamics empowered by web 2.0 reframes learning as an activity that permeates different areas of knowledge. In the light of new technologies, the goal of reaching a certain knowledge demands adequate strategies. These must be appropriate to the various possibilities of interaction with information, according to media\'s affordances, individual\'s learning particularities and the context that determined individual necessities of access. Educators, educational / instructional designers and content strategists invariably revise procedures to better understand the mechanics through which information is turned into knowledge. These professionals are able to understand the methods through which individuals process information and appropriate content from different resources in a practice that we can call learning or meaning making. In this context, appears the term transmedia narratives: a concept that encompasses plural learning practices enabled by media resources that compose our reality. Meaning making happens as we build narratives, coherent guidelines that empower ourselves to interact efficiently with the different types of content we have access to. This study investigated the concept of narrative and the impact of media in our ways to interact with others and with knowledge; learning in the context of transmedia narratives; two concrete and distinct examples in which one learn through narratives built with the use of various combined media. Finally, this study aimed to indicate new research pathways to be explored by researchers interested in the way learning and communication happen in a context determined by the digital media.

Establishing secured communication among the different entities in an industrial environment is a major concern. Especially with the introduction of the Industrial Internet of Things (IIoT), industries have been susceptible to cyber threats, which makes security a critical requirement for the industries. Prevailing industrial communication standards were proven to meet the security needs to some extent, but the major issue which was yet to be addressed was interoperability. To achieve interoperability, Open Platform Communication Unified Architecture (OPC UA) was introduced as a communication protocol. OPC UA helped bridge the gap between Information Technology (IT) and Operational Technology (OT) security needs, but this also gives rise to new attack opportunities for the intruder. In this thesis, we have analysed the security challenges in OPC UA and the impact of two different cyberattacks on the OPC UA. First, we have implemented an OPC UA Network with the help of Raspberry Pis and open62541, an open-source implementation of the OPC UA client and server. Following this, to evaluate the performance of the network, we performed three cybersecurity attacks, Packet Sniffing, Man in the Middle Attack (MITM) and Denial of Service attack. We assessed the impact these attacks have on the OPC UA network. We have also discussed the detection mechanism for the same attacks. This analysis has helped us recognize the threats faced by OPC UA in an IIoT environment with respect to message flooding, packet sniffing and man in the middle attack and the countermeasures to this attack have been discussed / Att etablera en säker kommunikation mellan de olika enheterna i en industriell miljö är en stor utmaning. Speciellt efter introduktionen av Industrial Internet of Things (IIoT) har industrier varit mottagliga för cyberhot vilket gör cybersäkerhet en prioritet. Rådande industriella kommunikationsstandarder har visats att till viss del uppfylla säkerhets- behoven, men en av de största problemen var bristen på interoperabilitet. För att uppnå interoperabiliteten skapades Open Platform Communication Unified Architecture (OPC UA) som kommun- ikationsprotokoll. OPC UA hjälper till att överbrygga gapet mellan säkerhetsbehoven av information- steknologi (IT) och Operational Technology (OT), men detta ger också upphov till nya attackmöjligheter för inkräktare. I detta examensarbete har vi analyserat säkerhetsutmaningarna i OPC UA och effekten av två olika cyberattacker på OPC UA. Först har vi implementerat ett OPC UA Network med hjälp av Raspberry Pis och open62541 som är en öppen källkodsimplementering av OPC UA klient och server. Efter detta utförde vi tre cybersäkerhetsattacker för att utvärdera nätverkets prestanda, packet sniffing, Man in the Middle Attack (MITM) och Denial of Service attack. Vi bedömde vilken effekt dessa attacker har på OPC UA-nätverket. Vi har också diskuterat detektionsmekanismen för samma attacker. Denna analys har hjälpt oss att känna igen de hot som OPC UA står inför i en IIoT-miljö med avseende på dataflöde, packet sniffing och Man in the Middle attack och även försvar mot dessa attacker har diskuterats.

Establishing secured communication among the different entities in an industrial environment is a major concern. Especially with the introduction of the Industrial Internet of Things (IIoT), industries have been susceptible to cyber threats, which makes security a critical requirement for the industries. Prevailing industrial communication standards were proven to meet the security needs to some extent, but the major issue which was yet to be addressed was interoperability. To achieve interoperability, Open Platform Communication Unified Architecture (OPC UA) was introduced as a communication protocol. OPC UA helped bridge the gap between Information Technology (IT) and Operational Technology (OT) security needs, but this also gives rise to new attack opportunities for the intruder. In this thesis, we have analysed the security challenges in OPC UA and the impact of two different cyberattacks on the OPCUA. First, we have implemented an OPC UA Network with the help of Raspberry Pis and open62541, an open-source implementation of the OPC UA client and server. Following this, to evaluate the performance of the network, we performed three cybersecurity attacks, Packet Sniffing, Man in the Middle Attack (MITM) and Denial of Service attack. We assessed the impact these attacks have on the OPC UA network. We have also discussed the detection mechanism for the same attacks. This analysis has helped us recognize the threats faced by OPC UA in an IIoT environment with respect to message flooding, packet sniffing and man in the middle attack and the countermeasures to this attack have been discussed. / Att etablera en säker kommunikation mellan de olika enheterna i en industriell miljö är en stor utmaning. Speciellt efter introduktionen av Industrial Internet of Things (IIoT) har industrier varit mottagliga för cyberhot vilket gör cybersäkerhet en prioritet. Rådande industriella kommunikationsstandarder har visats att till viss del uppfylla säkerhets- behoven, men en av de största problemen var bristen på interoperabilitet. För att uppnå interoperabiliteten skapades Open Platform Communication Unified Architecture (OPC UA) som kommun- ikationsprotokoll. OPC UA hjälper till att överbrygga gapet mellan säkerhetsbehoven av information- steknologi (IT) och Operational Technology (OT), men detta ger också upphov till nya attackmöjligheter för inkräktare. I detta examensarbete har vi analyserat säkerhetsutmaningarna i OPC UA och effekten av två olika cyberattacker på OPC UA. Först har vi implementerat ett OPC UA Network med hjälp av Raspberry Pis och open62541 som är en öppen källkodsimplementering av OPC UA klient och server. Efter detta utförde vi tre cybersäkerhetsattacker för att utvärdera nätverkets prestanda, packet sniffing, Man in the Middle Attack (MITM) och Denial of Service attack. Vi bedömde vilken effekt dessa attacker har på OPC UA-nätverket. Vi har också diskuterat detektionsmekanismen för samma attacker. Denna analys har hjälpt oss att känna igen de hot som OPC UA står inför i en IIoT-miljö med avseende på dataflöde, packet sniffing och Man in the Middle attack och även försvar mot dessa attacker har diskuterats.