The diploma thesis focuses on the water distribution system functioning without chlorine-based disinfectant. This thesis contains research of documented cases of examples of drinking water distribution systems both abroad and in the Czech Republic, which do not use disinfectants. Moreover, the thesis pay attention to chlorine and its effects on bacteria. The thesis deals with the first assessment of water supply structure, which determines whether the water supply structure is suitable for operating without disinfectant. The thesis describes the process of transition to the disinfectant-free operation and determines the undesired events, which may occur with the ending of the use of disinfectant. As a part of the research, the thesis examines the water supply system in village Kateřinice, to determine if it is suitable for operation without disinfectant.

Submitted by Milena Rubi (milenarubi@ufscar.br) on 2017-10-03T19:06:58Z No. of bitstreams: 1 ALBERTO_Tulio_2017.pdf: 2422402 bytes, checksum: 127bff2089f3d274b1abaa58c3d32578 (MD5) / Approved for entry into archive by Milena Rubi (milenarubi@ufscar.br) on 2017-10-03T19:07:11Z (GMT) No. of bitstreams: 1 ALBERTO_Tulio_2017.pdf: 2422402 bytes, checksum: 127bff2089f3d274b1abaa58c3d32578 (MD5) / Approved for entry into archive by Milena Rubi (milenarubi@ufscar.br) on 2017-10-03T19:07:27Z (GMT) No. of bitstreams: 1 ALBERTO_Tulio_2017.pdf: 2422402 bytes, checksum: 127bff2089f3d274b1abaa58c3d32578 (MD5) / Made available in DSpace on 2017-10-03T19:07:37Z (GMT). No. of bitstreams: 1 ALBERTO_Tulio_2017.pdf: 2422402 bytes, checksum: 127bff2089f3d274b1abaa58c3d32578 (MD5) Previous issue date: 2017-02-03 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / YouTube has become an important video sharing platform. Several users regularly produce video content and make this task their main livelihood. However, such success is also drawing the attention of malicious users propagating undesired comments and videos, looking for self-promotion or disseminating malicious links which may have malwares and viruses. Since YouTube offers limited tools for blocking spam, the volume of such messages is shockingly increasing and harming users and channels owners. In addition to the problem being naturally online, comment spam filtering on YouTube is different than the traditional email spam filtering, since the messages are very short and often rife with spelling errors, slangs, symbols and abbreviations. This manuscript presents a performance evaluation of traditional online classification methods, aided by lexical normalization and semantic indexing techniques when applied to automatic filter YouTube comment spam. It was also evaluated the performance of MDLText, a promising text classification method based on the minimum description length principle. The statistical analysis of the results indicates that MDLText, Passive-Aggressive, Naïve Bayes, MDL and Online Gradient Descent obtained statistically equivalent performances. The results also indicate that the lexical normalization and semantic indexing techniques are effective to be applied to the problem. Based on the results, it is proposed and designed TubeSpam, an online tool to automatic filter undesired comments posted on YouTube. / O YouTube tem se tornado uma importante plataforma de compartilhamento de vídeos. Muitos usuários produzem regularmente conteúdo em vídeo e fazem desta tarefa seu principal meio de vida. Contudo, esse sucesso também vem despertando a atenção de usuários mal-intencionados, que propagam comentários e vídeos indesejados para se autopromoverem ou para disseminar links maliciosos que podem conter vírus e malwares. Visto que o YouTube atualmente oferece recursos limitados para bloquear spam, o volume dessas mensagens está impactando muitos usuários e proprietários de canais. Além da característica inerentemente online do problema, filtrar spam nos comentários do YouTube é uma tarefa que difere-se da tradicional filtragem de spam em emails, pois as mensagens costumam ser muito mais curtas e repletas de erros de digitação, gírias, símbolos e abreviações que podem dificultar a tarefa de classificação. Assim, nesta dissertação é apresentada a avaliação de desempenho obtido por métodos tradicionais de classificação online auxiliados por técnicas de normalização léxica e indexação semântica, quando aplicados na filtragem automática de comentários indesejados postados no YouTube. Foi avaliado também o desempenho do MDLText, um promissor método de classificação de texto baseado no princípio da descrição mais simples. A análise estatística dos resultados indica que os métodos MDLText, Passivo-Agressivo, Naïve Bayes, MDL e Gradiente Descendente Online obtiveram desempenhos equivalentes. Além disso, os resultados também indicam que o uso de técnicas de normalização léxica e indexação semântica são eficazes para atenuar os problemas de representação de texto e, consequentemente, aumentar o poder de predição dos métodos de classificação. Baseado nos resultados dos experimentos, foi proposto e desenvolvido o TubeSpam, uma ferramenta online para filtrar automaticamente comentários indesejados postados no YouTube.

Context. Fault correction process is one of the two main activities in software evolution model. As it is very important for software maintainability, software industry especially large-scaled global companies, aim to have mature fault correction processes that detect faults and correct them in a continuous and efficient way. Considerable amount of effort is needed and some measures should be taken in order to be successful. This master thesis is mainly related with fault correction and finding possible solutions for better process. Objectives. The main aim of this study is to investigate and identify influential factors having affects over undesired fault correction outcomes. This study has three main stages: 1) to identify factors from company data that have affects over target factors, 2) to elicit influential factors from interviews and literature review, 3) to prioritize influential factors based on their significance. Based on the outcomes, giving recommendations to company and software industry is the other aim of this master thesis. Methods. This study mainly reflects the empirical research of software fault correction process and undesired outcomes of it. In this master thesis, both quantitative and qualitative data analysis were performed. Case study was conducted with Ericsson AB that data analysis was made with the archival data by using several methods including Machine Learning and Apriori. Also, surveys and semi-structured interviews were used for data collection instruments. Apart from this, literature review was performed in order to collect influential factors for fault correction process. Prioritization of the influential factors was made by using hierarchical cumulative voting. Results. Throughout the case study, quantitative data analysis, interviews and literature review was conducted and totally 45 influential factors were identified. By using these factors prioritization was performed with 26 practitioners (4 internal and 22 external) in order to find which factors are most a) significant and b) relevant in undesired fault correction outcomes. Based on the outcomes of prioritization, cause-effect diagram was drawn which includes all the important factors. Conclusions. This research showed that there are lots of factors influencing fault correction process. The practitioners mostly complained about the lack of analysis of deeply including correction of faults are not resulted the new requirements and they are not used for process improvement. Also, limited resources (such as work force, vacations and sickness), unbalanced fault correction task assignment and too much fault reports at the same time cause problems. Moreover, priorities of faults and customers affect the lead time of fault correction process as the critical faults are fixed at first. / +90 533 7698780

The diploma thesis is focused on risk analysis of water supply system in a small community. The WaterRisk project was solved by using tools of risk management including risk identification and quantification in the field of public water supply systems. Methodology and software for the risk management of water supply were evolved by using this project. In this thesis there is applied the methodology to the water supply system of Hradek village. The hydraulic analysis was performed for a thorough knowledge of water supply and its characteristic behavior. Risk analysis could be performed thanks to the knowledge of the entire system, its working and the most common faults. Analysis results are evaluated and compared for the water supply system which is consider like a system simple and complex. The corrective actions eliminate number of risks. These actions were proposed like a part of complex methodology. Further, there were determined optimal costs which corresponds with these corrective actions.

This research was based on ‘Catholic secondary education and identity reformation in Zambia’s Southern Province. Its main purpose was to explore the nature and scope of the undesired identity reformation experienced in Catholic secondary schools in Zambia’s Southern Province as well as suggest possible ways of how the problem can be resolved. The study was guided by the following main research question ‘How has a conflict of values between the evolving Catholic education policies and Zambian national education policies affected the identity of Catholic secondary schools in Zambia’s Southern Province?’ This question formed the main basis for the achievement of the study’s overarching purpose highlighted earlier. A qualitative methodology was utilized to gather data for this research. Data was gathered using semi-structured interviews, focus group interviews/discussions and documentary/content analysis. Research participants included: the Secretary of Catholic education, the PEO, school headteachers, teachers of RE, parents and grade twelve learners. Key documents analyzed using document analysis were Catholic education policies and Zambian national educational policies. The following findings resulted from the study: a conflict of values is non-existent between Catholic education policies and Zambian national education policies; there are four real/major causes of undesired identity reformation in Catholic secondary schools in Zambia’s Southern Province; the various contemporary challenges experienced by Catholic secondary schools in Zambia’s Southern Province are responsible for the undesired weakening of the school’s ‘academic’ and ‘religious’ mission; RE has experienced undesired changes at the levels of its nature, role and place in the Catholic secondary school curriculum over the years; Catholic secondary schools in Zambia’s Southern Province can be characterized as ‘partially Catholic’; realigning Catholic secondary schools with Catholic education policy involves returning such schools back to Catholic educational practice as recommended in Catholic education policies. The main conclusion of the study was that undesired identity reformation is present in Catholic secondary schools in Zambia’s Southern Province but it is not linked to a conflict of values in Catholic education policies and Zambian national education policies. To resolve the problem of undesired identity reformation in Catholic secondary schools, all study recommendations emphasized an urgent return by the schools to educational practice as recommended in Catholic education policy if they are to regain their lost desired total-Catholic character or identity. / Educational Foundations / D. Ed. (Philosophy of Education)