This dissertation focuses on developing algorithms and systems to improve the efficiency of operating mega datacenters with hundreds of thousands of servers. In particular, it seeks to address two challenges: First, how to distribute the workload among the set of datacenters geographically deployed across the wide area? Second, how to manage the server resources of datacenters using virtualization technology? In the first part, we consider the workload management problem in geo-distributed datacenters. We first present a novel distributed workload management algorithm that jointly considers request mapping, which determines how to direct user requests to an appropriate datacenter for processing, and response routing, which decides how to select a path among the set of ISP links of a datacenter to route the response packets back to a user. In the next chapter, we study some key aspects of cost and workload in geo-distributed datacenters that have not been fully understood before. Through extensive empirical studies of climate data and cooling systems, we make a case for temperature aware workload management, where the geographical diversity of temperature and its impact on cooling energy efficiency can be used to reduce the overall cooling energy. Moreover, we advocate for holistic workload management for both interactive and batch jobs, where the delay-tolerant elastic nature of batch jobs can be exploited to further reduce the energy cost. A consistent 15% to 20% cooling energy reduction, and a 5% to 20% overall cost reduction are observed from extensive trace-driven simulations. In the second part of the thesis, we consider the resource management problem in virtualized datacenters. We design Anchor, a scalable and flexible architecture that efficiently supports a variety of resource management policies. We implement a prototype of Anchor on a small-scale in-house datacenter with 20 servers. Experimental results and trace-driven simulations show that Anchor is effective in realizing various resource management policies, and its simple algorithms are practical to solve virtual machine allocation with thousands of VMs and servers in just ten seconds.

The present study investigates pragmatic transfer by Chinese learners of English as a foreign language (EFL) at low and high proficiency levels in email requests. Data was elicited using an email production questionnaire consisting of four email situations, which vary along two social dimensions: relative power, either equal or higher, and size of imposition, either big or small. Four groups of participants, who were all university students, took part in the study. Thirty-seven Chinese native speakers of Mandarin and 35 Australian native speakers of English provided the baseline data. Thirty-five Chinese EFL learners at low proficiency level and 38 Chinese EFL learners at high proficiency level provided the target data. Altogether 580 emails were collected. Data was classified according to an adapted version of the coding scheme developed by Blum-Kulka et al. (1989). Email requests were analyzed at both the utterance and discourse levels. At the utterance level, directness level, strategy types and internal modifiers were examined. At the discourse level, external modifiers, including all the supportive moves in the opening, body, and closing of an email request were analyzed. Following Beebe et al. (1990), data was looked at in terms of the frequency, content and average number of pragmatic features. Both qualitative and quantitative analysis methods were adopted. To determine evidence of pragmatic transfer, first, the Chinese baseline data and the English baseline data were compared. The EFL data was then compared with that of the two baseline groups. Pragmatic transfer was confirmed if the EFL data resembled the Chinese baseline data but differed from the English baseline data. In addition, the instances of pragmatic transfer displayed by the EFL groups at low and high proficiency levels were compared to examine the correlation between pragmatic transfer and language proficiency, that is, whether pragmatic transfer increases or decreases as learners’ language proficiency increases. Pragmatic transfer was investigated on both pragmalinguistic and sociopragmatic levels. Findings of the present study show that pragmalinguistic and sociopragmatic transfer occurred at the utterance and the discourse levels in all three areas: the frequency, content and average number of pragmatic features, by both the low and high proficiency EFL learners. Moreover, a comparison of the performance of requests by the two learner groups indicates that the high proficiency learners had a greater amount of pragmatic transfer than the low proficiency learners. The findings of this study lend strong support to the positive correlation hypothesis proposed by T. Takahashi and Beebe (1987). The findings of the present study highlight the importance of the inclusion of pragmatic components in foreign language teaching. Pedagogical implications of the findings are discussed. Possible suggestions regarding how to improve the EFL learners’ pragmatic competence are provided.

The present study investigates pragmatic transfer by Chinese learners of English as a foreign language (EFL) at low and high proficiency levels in email requests. Data was elicited using an email production questionnaire consisting of four email situations, which vary along two social dimensions: relative power, either equal or higher, and size of imposition, either big or small. Four groups of participants, who were all university students, took part in the study. Thirty-seven Chinese native speakers of Mandarin and 35 Australian native speakers of English provided the baseline data. Thirty-five Chinese EFL learners at low proficiency level and 38 Chinese EFL learners at high proficiency level provided the target data. Altogether 580 emails were collected. Data was classified according to an adapted version of the coding scheme developed by Blum-Kulka et al. (1989). Email requests were analyzed at both the utterance and discourse levels. At the utterance level, directness level, strategy types and internal modifiers were examined. At the discourse level, external modifiers, including all the supportive moves in the opening, body, and closing of an email request were analyzed. Following Beebe et al. (1990), data was looked at in terms of the frequency, content and average number of pragmatic features. Both qualitative and quantitative analysis methods were adopted. To determine evidence of pragmatic transfer, first, the Chinese baseline data and the English baseline data were compared. The EFL data was then compared with that of the two baseline groups. Pragmatic transfer was confirmed if the EFL data resembled the Chinese baseline data but differed from the English baseline data. In addition, the instances of pragmatic transfer displayed by the EFL groups at low and high proficiency levels were compared to examine the correlation between pragmatic transfer and language proficiency, that is, whether pragmatic transfer increases or decreases as learners’ language proficiency increases. Pragmatic transfer was investigated on both pragmalinguistic and sociopragmatic levels. Findings of the present study show that pragmalinguistic and sociopragmatic transfer occurred at the utterance and the discourse levels in all three areas: the frequency, content and average number of pragmatic features, by both the low and high proficiency EFL learners. Moreover, a comparison of the performance of requests by the two learner groups indicates that the high proficiency learners had a greater amount of pragmatic transfer than the low proficiency learners. The findings of this study lend strong support to the positive correlation hypothesis proposed by T. Takahashi and Beebe (1987). The findings of the present study highlight the importance of the inclusion of pragmatic components in foreign language teaching. Pedagogical implications of the findings are discussed. Possible suggestions regarding how to improve the EFL learners’ pragmatic competence are provided.

The present study investigates pragmatic transfer by Chinese learners of English as a foreign language (EFL) at low and high proficiency levels in email requests. Data was elicited using an email production questionnaire consisting of four email situations, which vary along two social dimensions: relative power, either equal or higher, and size of imposition, either big or small. Four groups of participants, who were all university students, took part in the study. Thirty-seven Chinese native speakers of Mandarin and 35 Australian native speakers of English provided the baseline data. Thirty-five Chinese EFL learners at low proficiency level and 38 Chinese EFL learners at high proficiency level provided the target data. Altogether 580 emails were collected. Data was classified according to an adapted version of the coding scheme developed by Blum-Kulka et al. (1989). Email requests were analyzed at both the utterance and discourse levels. At the utterance level, directness level, strategy types and internal modifiers were examined. At the discourse level, external modifiers, including all the supportive moves in the opening, body, and closing of an email request were analyzed. Following Beebe et al. (1990), data was looked at in terms of the frequency, content and average number of pragmatic features. Both qualitative and quantitative analysis methods were adopted. To determine evidence of pragmatic transfer, first, the Chinese baseline data and the English baseline data were compared. The EFL data was then compared with that of the two baseline groups. Pragmatic transfer was confirmed if the EFL data resembled the Chinese baseline data but differed from the English baseline data. In addition, the instances of pragmatic transfer displayed by the EFL groups at low and high proficiency levels were compared to examine the correlation between pragmatic transfer and language proficiency, that is, whether pragmatic transfer increases or decreases as learners’ language proficiency increases. Pragmatic transfer was investigated on both pragmalinguistic and sociopragmatic levels. Findings of the present study show that pragmalinguistic and sociopragmatic transfer occurred at the utterance and the discourse levels in all three areas: the frequency, content and average number of pragmatic features, by both the low and high proficiency EFL learners. Moreover, a comparison of the performance of requests by the two learner groups indicates that the high proficiency learners had a greater amount of pragmatic transfer than the low proficiency learners. The findings of this study lend strong support to the positive correlation hypothesis proposed by T. Takahashi and Beebe (1987). The findings of the present study highlight the importance of the inclusion of pragmatic components in foreign language teaching. Pedagogical implications of the findings are discussed. Possible suggestions regarding how to improve the EFL learners’ pragmatic competence are provided.

The present study investigates pragmatic transfer by Chinese learners of English as a foreign language (EFL) at low and high proficiency levels in email requests. Data was elicited using an email production questionnaire consisting of four email situations, which vary along two social dimensions: relative power, either equal or higher, and size of imposition, either big or small. Four groups of participants, who were all university students, took part in the study. Thirty-seven Chinese native speakers of Mandarin and 35 Australian native speakers of English provided the baseline data. Thirty-five Chinese EFL learners at low proficiency level and 38 Chinese EFL learners at high proficiency level provided the target data. Altogether 580 emails were collected. Data was classified according to an adapted version of the coding scheme developed by Blum-Kulka et al. (1989). Email requests were analyzed at both the utterance and discourse levels. At the utterance level, directness level, strategy types and internal modifiers were examined. At the discourse level, external modifiers, including all the supportive moves in the opening, body, and closing of an email request were analyzed. Following Beebe et al. (1990), data was looked at in terms of the frequency, content and average number of pragmatic features. Both qualitative and quantitative analysis methods were adopted. To determine evidence of pragmatic transfer, first, the Chinese baseline data and the English baseline data were compared. The EFL data was then compared with that of the two baseline groups. Pragmatic transfer was confirmed if the EFL data resembled the Chinese baseline data but differed from the English baseline data. In addition, the instances of pragmatic transfer displayed by the EFL groups at low and high proficiency levels were compared to examine the correlation between pragmatic transfer and language proficiency, that is, whether pragmatic transfer increases or decreases as learners’ language proficiency increases. Pragmatic transfer was investigated on both pragmalinguistic and sociopragmatic levels. Findings of the present study show that pragmalinguistic and sociopragmatic transfer occurred at the utterance and the discourse levels in all three areas: the frequency, content and average number of pragmatic features, by both the low and high proficiency EFL learners. Moreover, a comparison of the performance of requests by the two learner groups indicates that the high proficiency learners had a greater amount of pragmatic transfer than the low proficiency learners. The findings of this study lend strong support to the positive correlation hypothesis proposed by T. Takahashi and Beebe (1987). The findings of the present study highlight the importance of the inclusion of pragmatic components in foreign language teaching. Pedagogical implications of the findings are discussed. Possible suggestions regarding how to improve the EFL learners’ pragmatic competence are provided.

A Proposta Técnica é uma documentação cuja elaboração é uma atividade frequente nas empresas prestadoras de serviço e fornecedoras de produtos, que envolve um time multidisciplinar de profissionais e consome quantidade significativa de recursos financeiros e tempo, tanto das empresas proponentes quanto das empresas contratantes, que analisarão seu conteúdo e por fim selecionarão a proposta a ser aceita. A proposta desempenha vários papeis, funcionando como um material de comunicação da empresa que representa, ao explicitar sua capacidade para realização do trabalho proposto, e também como anexo contratual da transação comercial, passando por servir de fonte de informações para a orçamentação do Projeto e sugerir novas soluções às problemáticas apresentadas pelo cliente. O presente trabalho explorará a importância da Proposta Técnica nas negociações comerciais, assim como seu processo de elaboração em empresas construtoras de edifícios comerciais para iniciativa privada no Brasil, utilizando-se a metodologia de estudo de caso. Por meio de análise da documentação e de entrevistas com os profissionais envolvidos tanto na elaboração quanto na classificação das propostas, são discutidos os pontos essenciais no processo de produção de uma Proposta Técnica. / The Technical Proposal is a document whose preparation is a frequent action in companies which offer services or products. Besides it involves a multidisciplinary team, it also spends a significant amount of resources and time of all companies involved (the bidders and the contractor who will analyze it and decide which one will be accept). The Technical Proposal has some roles to play: be a promotional material of the proponent company, compose the contract, supply the cost estimation with time and quantity information and, finally, suggest new or complementary solutions to client´s questions. The aim of this research is, by doing case studies, to discuss the Technical Proposal business importance and to describe its preparation process in Brazilian commercial buildings construction companies. Interviews and documental analyses are the chosen tools to identify the main points of proposal development and the trends of this area.

Context. Nowadays, mobile applications and services have occupied an essential part in our daily life. We use them to fulfill our needs for communication, news, or entertainment. Within a fierce competitive market, mobile applications need continually improvement through collections of user feedback to satisfy users’ needs. However, in mobile applications, lack of a comprehensive consideration in designing feedback mechanism makes it difficult to efficiently collect user feedback. It shows only approximate one third online user reviews that contain helpful information for improvement. In addition, users may be disturbed by feedback request, result in rejecting to provide feedback. Objectives. This study aims to provide a comprehensive consideration for elicitation of user feedback in mobile applications. Methods. This study followed a mixed qualitative-quantitative research approach. Firstly, we conducted an experiment and a semi-structured interview to investigate how do users provide feedback when they are using a mobile application. Then a content analysis and a statistical analysis were conducted for analyzing collected data.    Results. Users’ preference of feedback approaches and the encouraging/discouraging factors for users to provide feedback were identified. We also assessed user-perceived suitable timings for interruption of feedback request. Conclusions. The result shows, generally, users prefer to provide feedback when asked by feedback request. Three encouraging factors and Three discouraging factors are identified. The beginning of mobile application execution is perceived as best moment for interruption of feedback request. In addition, this study also provides a three-time-dimensions approach for researching disturbances caused by interruption of feedback request as well as other peripheral information.

With the standardization of IP Multimedia Subsystem (IMS), the telecommunications scene becomes more and more converged and in the future we will most likely access our services from all kinds of devices and link them together. One important future access method that has so far been left out of the standardization is television. There is a need for Internet Protocol Television (IPTV) to work together with IMS and this thesis focuses on one aspect of that convergence, namely charging. The problem explored in this thesis is if there is an efficient way of charging for IPTV services while taking advantage of the IMS charging functionality and this is done for two aspects of the problem. First, the possiblilty of an efficient Session Initiation Protocol (SIP) signaling schema is investigated and then a good charging Application Programming Interface (API) to be used when developing applications is investigated. The findings of these two investigations are then tested and improved during the implementation of a demo application. This thesis delivers specifications for a signaling schema that enables a Set-Top Box (STB) to pass charging information to an IMS network via INFO requests inside a special charging session. The schema is small and extendable to ensure that it can be modified further on if necessary. The thesis also delivers an encapsulating and intuitive charging API to be used by developers who want to charge for their services.

This study focuses on virtual services and more particularly on the usage of chat services to provide a formal evidence of the status of one particular chat reference service. It explores the efficiency of the chat service model at Umeå University Library for the period August 2015 to February 2016 and covers a total of 221 virtual chat transactions. It uses content analysis and a process model of chat-based reference to bring comprehension of the content for both inquiries and replies to understand the usage of this service and discern trends and discrepancies. The results show that September and February have the highest amount of questions due to the distribution of the academic year. Furthermore, the requests appeared to be spread evenly over the distinguished categories with a slightly lower number of research related questions which reflect the difficulty to perform a reference interview in the virtual context. The study uncovered that the types of inquiries affect the level of completeness and consequently questions requiring general knowledge of the library are more successfully answered than more specific questions. The referrals are connected to the knowledge area of the librarian answering the chat and remain internal. Those results can be easily improved through skill development programs but librarian evaporation remains a predominant issue that should be addressed. Despite the circumstantial attendance of the chat, the chat service appears to be a valid alternative to the information desk and the library management should improve the chat efficacy by involving more competences.

The aim of my Master's degree thesis is to unify the total view of the question of euthanasia and assisted suicide with an emphasis on the criminal law. I am not trying to concluded if legalise euthanasia by the Czech law or not, I just would like to outline the possibility of the legislation in the Czech law for the future, after providing the analysis of the countries where euthanasia has happened legal in the last few years. This thesis consists of the six chapters. At the beginning I am trying to give a detailed description of the substance of euthanasia and other related terms as assisted suicide, do not resuscitate and then I state usual forms and divisions of euthanasia. Then I deal with the history term in the world because for understanding and clarification this is necessary. The next chapter is already about euthanasia in Czech Republic, where this question has never been legalised but there were some efforts in some forms to do that. In this chapter I am concened with a legal qualification of killing on request and assisted suicide de lege lata and de lege ferenda. I also mention the opinions of the opponents and the protagonists of the question of euthanasia. The next chapter deals with a quality paliative care as one the arguments against euthanasia. It is impossible to omit the...