There are about 700,000 on-site sewage facilities (OSSFs) in Sweden, almost a quarter of which amount only to septic tanks for sludge collection and removal, with no form of post-treatment. All these OSSFs contribute about 10 % of the total anthropogenic phosphorus (P) load from Swedish coasts to the Baltic Sea. They also leak a considerable, but hard to quantify, amount of micropollutants (MPs). This is a large, diverse group of organic trace contaminants, including e.g., pharmaceuticals and detergents. The interests concerning OSSFs in Sweden have over time shifted from merely disposal issues, to health (removal of pathogens) and then further on to nutrient leakage.   In recent years there has been a growing interest in a more comprehensive sustainability perspective. In that spirit, during this thesis project, environmental (n=5) and socio-economic (n=5) criteria were assessed for three conceptualized, full-scale OSSFs. The evaluation was based on the efficiency of domestic wastewater treatment from a single household. These systems comprised conventional post-treatment, as well as extra capabilities for treating P and MPs. The evaluation was done with a multi-criteria analysis (MCA), the goal of which was to provide a proof-of-concept analysis of these treatment technologies in order to serve as decision-support at a national policy level.   The first of the decision options was a sandbed filter with Polonite® and Granular Activated Carbon (GAC) filters, for the adsorption of P and MPs, respectively. The second option was a reference package treatment system (PTSs), with flocculation chemicals for the precipitation of P, but nothing for the removal of MPs. The third solution was another PTSs, but with Polonite and GAC filters. The stakeholders chosen in this study were the Swedish Agency for Marine and Water Management (SwAM), a municipal regulator and a property owner. A total of 100 weight points were assigned to the 10 sustainability criteria. The minimum and maximum of these created a range for each criterion, which was multiplied with the grades 1-5 and added together.   The most sustainable alternative in this study was found to be the sandbed filter with 102-694 points (mid-range of 398), followed by the PTSs reference with 79-560 points (mid-range of 319.5) and the PTSs with filters with 82-500 points (mid-range of 291). The property owner put the highest weight on the economy, while SwAM put the highest weight on the environmental criteria, and the regulator on the social criteria. The sensitivity analysis indicated possible impact by changing the ranking position between the PTSs. This was deemed likeliest for the weight change of life-cycle costs and the grade change of the ease of compliance (legislative) criterion, but the highest ranking of the sandbed filter seemed hard to budge. / Det finns ungefär 700,000 enskilda avlopp i Sverige, varav ca en fjärdedel endast består av trekammarbrunnar, eller liknande system, utan någon form av post-rening. Alla dessa enskilda avlopp belastar ungefär 10 % av den totala antropogena fosforn (P) från svenska kuster till Östersjön. Det sker också ett läckage av en betydande, men svår-kvantifierbar, mängd mikroföroreningar (MF). Detta är en stor, divers grupp av organiska spårföroreningar som t. ex inkluderar läkemedelsrester och tvättmedel. De övergripande intressena angående enskilda avlopp i Sverige har över tid skiftat från frågor gällande dess bortskaffande, till hälsa (avskiljning av smittämnen) och vidare till näringsläckage.   Under de senaste åren har det blivit ett växande intresse för ett mer omfattande hållbarhetsperspektiv. Under det här examensarbetet bedömdes miljö-kriterier (n=5) och socio-ekonomiska kriterier (n=5) för tre teoretiska, fullskaliga enskilda avlopp. Utvärderingen baserades på avloppsreningens effektivitet från ett enskilt hushåll. Dessa avloppssystem innefattade konventionell post-rening, såväl som ytterligare förmåga att behandla P och MF. Metoden som användes för utvärderingen var en multi-kriterie analys (MKA), vars mål var att förse en konceptuell analys av de här tre avloppssystemen med syfte att tjäna som beslutsstöd på en nationell policy-nivå.   Det första beslutsalternativet var en markbädd med Polonite® och granulärt aktivt kol (GAK) filter, för adsorption av P och MF. Det andra alternativet var ett referens minireningsverk (MRV) med fällningskemikalier för utfällning av P, men ingenting specifikt för avskiljning av MF från avloppsvattnet. Den tredje avloppslösningen var även den ett MRV, men med Polonite och GAK filter, som markbädden. Intressenterna som valdes i den här studien var Havs- och vattenmyndigheten (HaV), ett kommunalt miljökontor och en fastighetsbrukare. De 10 hållbarhetskriterierna fick var och en 100 viktpoäng tilldelade. De lägsta och högsta viktpoängen från de tre intressenterna skapade ett intervall för varje kriterie, vilket multiplicerades med betygen 1-5 och summerades.   Det mest hållbara alternativet i den här studien befanns vara markbädden med 102-694 poäng (mittvärde 398), följt av referens MRV med 79-560 poäng (mittvärde 319.5) och MRV med filter med 82-500 poäng (mittvärde 291). Fastighetsbrukaren tilldelade högst viktpoäng till ekonomin, medan HaV gjorde detsamma till miljökriterierna och miljökontoret till de sociala kriterierna. Känslighetsanalysen indikerade möjlig påverkan av de analyserade ändringarna genom att förändra den ovanstående rankingen mellan de båda MRV. Detta bedömdes vara troligast för viktändringen av livs-cykel kostnader och betygsändringen av kriteriet som avser lättheten att efterleva nutida och framtida (lagliga) krav, men den högsta rankingen av markbädden verkade svår att ändra på.

L’évolution de l’aménagement urbain s’oriente actuellement vers la démarche du développement durable. C’est à travers les projets à l’échelle locale – les quartiers durables –que sont initiées et appliquées les politiques des collectivités en la matière. Le nombre croissant et la diversité de ces opérations reflètent toutefois un manque d’études sur l’approche et le processus d’élaboration propre à cette échelle du quartier ainsi que la question de l’adaptation de la démarche dans chaque contexte urbain. A partir de ce constat, nous avons défini le sujet central de notre recherche comme le croisement et l’intégration de la notion de la durabilité dans la complexité des contextes locaux.Notre approche s’appuie sur un regard transversal et croisé des thématiques interdisciplinaires du développement durable en insérant les questionnements propres à la conduite des projets architecturaux et urbains. Notre principal objectif est de contribuer à une base de réflexion synthétique pour l’aide à la décision et la programmation des projets de quartiers, avec le cas d’étude de la ville d’Hanoï. Nous mettons en place une approche systémique sous forme de grilles d’analyse multicritères génériques pour l’évaluation des projets de quartiers durables. Nous proposons des recommandations et des préconisations par une analyse croisée des expériences européennes du domaine, en vue d’une démarche opérationnelle de l’élaboration des quartiers durables. Il s’agit d’un travail de référence permettant d’actualiser et d’enrichir les connaissances sur les dispositifs architecturaux et urbains durables adaptés aux contextes des villes des pays émergents comme le Vietnam. / The evolution of urban development is moving towards the sustainable development approach. It is through projects at the local scale - sustainable neighborhoods - that community policies on this matter are initiated and implemented. The increasing number and diversity of these operations reflect however a lack of studies on the approach and the development process specific to the scale of neighborhood, as well as the question of adaptation of the approach to each urban context. Based on this observation, we defined the central subject of our research as the crossing and integration of the concept of sustainability in the complexity of local contexts.Our approach is based on a transverse and crossed look on interdisciplinary themes of sustainable development, by crossing questions specific to architectural and urban projects management. Our main objective is to contribute to a synthetic base of reflection for decision-support for district planning, based on the case study of Hanoi City.We implement a systemic approach in the form of generic multi-criteria analysis grids for the evaluation of sustainable neighborhoods projects. We propose recommendations by a crossed analysis of European experiences in the field, in view of an operational approach to the development of sustainable neighborhoods. This is a reference work allowing updating and deepening knowledge on architectural and urban sustainable features, adapted to the contexts of cities in emerging countries like Vietnam.

Outsourcing and Offshoring represent modern management tools used to increase the competitive advantage of the enterprise by a better focus on its core business, lower costs, higher flexibility or better quality of its processes. These benefits are basically achieved either by transferring some of company's non-core processes on an external provider or on a Daughter Company based abroad. The basic objective of this work is to provide management or scholars with a comprehensive view on above mentioned tools from the phase of adopting decisions about their application up to their final evaluation. To be highly objective and complete there are presented also the tax optimization models within Offshoring by using so called "Tax heavens". For better understanding what procedures and tools are available to managers to comply with current legislation when using these methods, there is added the transfer price issue as one of the possible tools for a tax optimization. Within the practical part of the thesis I tried to create a country evaluation model for international outsourcing based on multi-criteria analysis of localization factors. Doing so the biggest emphasis was laid on minimization of risk of failure from the side of process provider. The model was also enriched by commonly not often used ethic factors. The result of carried out analysis of chosen countries shows that even significantly lower labor costs can not weight on other localization factors in case they are of considerably worse levels. The last part of my work demonstrates the application of both examined methods in the Czech textile industry with a view to bring evidence that they are capable to lead to an improvement of its competitive position on foreign markets. Due to my vocational interests there was chosen Russian market as a sample. Objectives of this doctoral thesis have been achieved by extensive research of various information sources, incl. statistical data and available surveys carried out by reputable institutions and accompanied by personal expert experience from real practice.

Made available in DSpace on 2015-03-05T17:04:34Z (GMT). No. of bitstreams: 0 Previous issue date: 30 / Nenhuma / No contexto de organizações humanas, o processo de avaliação de desempenho tem merecido a atenção de praticantes e pesquisadores, pois, pela avaliação de desempenho, a empresa pode identificar diferenciais que as ajudem a serem mais competitivas. Para tanto, o rápido desenvolvimento de produtos, integração de informações, tecnologias de comunicação avançadas, customização de produtos e coordenação de redes de suprimentos, vêm forçando as empresas à tomada de decisões mais rápidas. O uso de métodos qualitativos de apoio à decisão pode contribuir para reduzir riscos e gerenciar incertezas nesta tomada de decisão mais rápida. O objetivo deste trabalho foi apresentar um estudo de caso no qual foi desenvolvido e testado um método de análise das preferências dos gestores de operações logísticas empresariais internas. O resultado da aplicação do método foi comparado com o resultado de algumas decisões tomadas na empresa. A metodologia de pesquisa contou com um grupo focado, formado pelos gestores da logística in / The context of human organizations, researchers and professionals has considered a lot the process of performance evaluation, once it provides to the company to identify differentials which can help them to be more competitive. Therefore, the fast development of products, information integration, advanced communication technologies, customization of products and coordination of supply nets, is forcing the companies to take faster decisions. The use of qualitative method of support to the decision, may contribute to reduce risks and manage uncertainties in this faster decision taking. The objective of the present work was to present a case study in which was developed and tested an analysis method of the preferences of the internal entrepreneurial logistic operations managers. The result of the method’s application was compared to the result of some decisions taken in the company. The research methodology reckoned with a focus group formed by the company’s internal logistic managers, involving the supply, prod

Submitted by Silvana Teresinha Dornelles Studzinski (sstudzinski) on 2016-06-13T13:42:00Z No. of bitstreams: 1 Elionai de Souza Magalhães_.pdf: 2039789 bytes, checksum: 5d3f44b9164f4c68bcb09e63c3a2dda0 (MD5) / Made available in DSpace on 2016-06-13T13:42:00Z (GMT). No. of bitstreams: 1 Elionai de Souza Magalhães_.pdf: 2039789 bytes, checksum: 5d3f44b9164f4c68bcb09e63c3a2dda0 (MD5) Previous issue date: 2016-03-04 / IFAM - Instituto Federal de Educação, Ciência e Tecnologia do Amazonas / A responsabilidade de tomar decisões em si não é fácil, e quando está relacionada à gestão de recursos na área pública é uma tarefa ainda mais difícil, pois está ligada a um alto nível de complexidade. Neste trabalho, é apresentado um modelo computacional baseado em análise de decisão multicritério para a priorização da alocação de recursos financeiros para as comunidades ribeirinhas da região de Coari, Amazonas. Com o surgimento da Pesquisa Operacional, foi possível o desenvolvimento de métodos que auxiliam os tomadores de decisão no que se refere à avaliação e escolha em ambientes que envolvem multicritérios. É o caso da gestão pública, cuja decisão sobre a alocação de recursos passa pela análise de diversos critérios. As técnicas de decisão multicritério, aliadas às novas tecnologias de informação e comunicação, possibilitam novas formas de conhecimento e maior qualidade em diversos serviços. O emprego destas tecnologias no desenvolvimento de ferramentas de auxílio à decisão para a alocação de recursos é de grande utilidade, tendo em vista a automação no processo de análise e rapidez na obtenção dos resultados, possibilitando agilidade na tomada de decisão. Neste trabalho, é desenvolvido um modelo computacional baseado na técnica de Auxílio à Decisão Multicritério para ajudar na alocação de recursos públicos em comunidades ribeirinhas do Amazonas. O modelo emprega a técnica TOPSIS de análise multicritério com o intuito de obter um ranking das comunidades, para assim indicar aquela com maior grau de prioridade para receber a alocação de recursos públicos. Os experimentos foram realizados assumindo um conjunto de seis critérios empregados na ordenação de oito regiões de comunidades ribeirinhas. No estudo realizado, a lista de priorização indicou a região de comunidades do Baixo Solimões como a prioritária para a alocação de recursos públicos e a robustez da priorização obtida na aplicação efetuada foi avaliada através da realização de uma análise de sensibilidade. / The responsibility of making decisions itself is not easy, and when it is related to the management of resources in the public sector is an even more difficult task, because it is linked to a high level of complexity. In this paper, we present a computational model based on multi-criteria decision analysis to prioritize the allocation of financial resources to the coastal communities of Coari region of Amazonas. With the emergence of Operational Research, development methods was possible that assist decision makers with regard to the evaluation and choice in environments that involve advanced. This is the case of public administration, whose decision on the allocation of resources involves the analysis of various criteria. The techniques of multi-criteria decision, combined with the new technologies of information and communication, enable new forms of knowledge and higher quality in different services. The use of these technologies in the development of the decision support tools for the allocation of resources is useful in view of automation in the process of analysis and speed in obtaining results, enabling agility in decision making. In this work, we developed a computational model based on the technique of Aid to Decision Multicriteria to assist in the allocation of public resources in riverine communities of Amazonas. The model uses the TOPSIS technique of multi-criteria analysis in order to obtain a ranking of the communities, so as to indicate that more priority to receive the allocation of public resources. The experiments were performed assuming a set of six criteria used in the ordination of eight regions of riverside communities. In the study, the list of priority indicated the region of the Lower Solimões communities as a priority for the allocation of public resources and the robustness of the obtained priority in the application made was assessed by performing a sensitivity analysis.

La qualité des boues est directement liée à la qualité des étapes de traitement présentes au sein d’une station d’épuration. En termes de traitement et d’élimination des boues, nous observons de la part des acteurs locaux, une volonté d’abandon définitif et durable de la filière « dépôt en centre de stockage », étant donnée une règlementation et des plans régionaux (notamment le PREDIS de Corse), toujours plus exigeant en termes de valorisations des déchets industriels et spéciaux. Nous observons également un abandon progressif et programmé des pratiques relatives à l’épandage. En effet, l’épandage des boues d’épuration fait l’objet d’une vaste controverse qui met en avant les risques sanitaires et environnementaux qu’elle engendrerait sur les sols agricoles. Au sein de notre région, cette pratique est réalisée de manière non règlementaire. En Corse, les acteurs locaux semblent avoir optés pour la solution du compostage en vue de valoriser la production de boues d’épuration. En effet, près des 2/3 du tonnage annuel en MS de boues sont actuellement valorisés via cette filière. Le processus de compostage équivaut à une fermentation aérobie, faisant intervenir une multitude de micro-organismes. Cette filière de compostage, au même titre que l’épandage, a connu une forte expansion de son activité mais semble avoir des failles et des limites : problèmes de mauvaises odeurs ; règlementation de plus en plus exigeante ; et enfin surproduction de compost invendable aux vues de la demande. Une autre solution pourrait présenter des atouts supérieurs : la méthanisation avec production d’électricité et de chaleur par cogénération. Cette production d’énergies passe obligatoirement par la valorisation du biogaz produit par ce système. En effet, le biogaz est un mélange contenant principalement du méthane (50 à 70%) et du dioxyde de carbone Du fait d’une forte concentration en méthane, le biogaz est un bon fournisseur d’énergie (1m3 de biogaz a un pouvoir calorifique de 6 kWh soit l’équivalent de 0,6 l de fuel). Pour produire de l’électricité, le processus de méthanisation doit être couplé à un moteur à cogénération ou à plusieurs microturbines. EDF a alors l’obligation de racheter l’électricité produite à un prix se situant entre 11 et 14 centimes d’euros/kwh., Après 15 ans, le rachat du kwh produit se fait aux taux proposés par EDF. En Corse, seulement une station d’épuration est équipée d’un digesteur couplé en série à cinq microturbines, produisant de la chaleur et de l’électricité par cogénération : La station de traitement des eaux usées de Campo Dell’Oro à Ajaccio. Ce procédé de valorisation énergétique pourrait être amélioré via le remplacement à terme, des microtubines par un moteur à cogénération. Une AMCDP a notamment permis de surclasser cette technologie vis-à-vis des microturbines, beaucoup moins efficaces en termes de rendement mais aussi de fonctionnement. L’équipement des stations d’épuration de plus fortes capacités en Corse, de digesteurs associés à un moteur à cogénération pourrait être une solution durable à la problématique de la valorisation énergétique des boues. / Sludge quality is directly related to the quality of of these processing steps present in a water treatment plant. In terms of treatment and disposal of sludge, we observe on the part of local actors, a willingness to permanent and lasting abandonment of the sector 'deposit in storage centre'', given a regional plans and regulations (including the PREDIS Corsica), increasingly demanding in terms of valuations of industrial and special waste. We also observe a gradual and planned abandonment of practices for spreading. Indeed, the spreading of sewage sludge is the subject of widespread controversy which highlights the health and environmental risks it would lead to agricultural soils. In our region, this practice is not carried out regulatory manner. In Corsica, the local actors seem to have opted for the solution of compost to enhance the production of sewage sludge. Nearly 2/3 of the annual tonnage MS sludge is currently valued via this pathway. The composting process is equivalent to an aerobic fermentation involving a multitude of microorganisms. This composting stream, as well as spreading, experienced strong expansion of its business but seems to have flaws and limitations: problems with odors; regulatory increasingly demanding; and finally overproduction unsaleable compost to the views of the application.Another solution could present higher advantages: anaerobic digestion with production of electricity and heat from cogeneration. . This energy production go through the biogas produced by this system. Indeed, the biogas is a mixture containing mostly methane (50 – 70 %) and carbon dioxide. Due to a high concentration of methane, biogas is a good energy supplier (1m3 biogas has a calorific value 6 kWh equivalent to 0.6 liters of fuel). To generate electricity, the anaerobic digestion process must be coupled to an engine cogeneration or several microturbines. EDF has the obligation to purchase electricity at a price ranging between 11 and 14 euro cents/kwh. After 15 years, the redemption of the kwh produced is done at the rate offered by EDF.In Corsica, only a treatment plant is equipped with a digester coupled in series to five microturbines, producing heat and electricity cogeneration: The wastewater treatment plant at Campo Dell'Oro /Ajaccio. This energy recovery process could be improved with an eventual replacement of the microtubines by a cogeneration engine. An AMCDP allowed to outperform this technology towards microturbines, much less efficient in terms of performance.The equipment of the highest capacity treatment plants in Corsica, digesters associated with a cogeneration engine could be a lasting solution to the problem of energy recovery of sewage sludge.

Les réseaux de chauffage urbain (DHN) sont un moyen efficace de fournir de l'énergie thermique aux consommateurs. L'état actuel de la technique montre que les DHN évoluent vers des réseaux thermiques intelligents dans des systèmes énergétiques intégrés alors que leur conception est basée sur les principes de durabilité. Sur cette base, cette thèse couvre deux domaines de recherche principaux : Fonctionnement et conception des systèmes de chauffage urbain. Dans la partie A de cette thèse, des méthodes avancées pour le fonctionnement de la DHN sont développées à l'aide d'analyses exergétiques et thermoéconomiques. Cela inclut la formulation de bilans de coûts exergétiques pour les modèles de réseau basés sur des graphiques. La partie intrinsèque est le déploiement d'une matrice algébrique, qui détermine les coûts exergétiques pour la modélisation dynamique du système. Une étude de cas d'un réseau réel prouve que la méthodologie proposée offre de nouvelles perspectives sur l'allocation individuelle des coûts, ce qui aide à évaluer la faisabilité de l'intégration par des tiers et l'intégration des sources d'énergie distribuées. Dans la partie B de cette thèse, un nouvel indicateur appelé «load deviation index (LDI)» est proposé pour lier les mesures de la demande (DSM) à la conception durable des systèmes DHN. Pour cela, un cadre de conception axé sur les affaires est proposé, qui prend en compte les influences critiques dans le DHN tout en évitant un trop grand détail. Le comportement du DSM est analysé du point de vue du système et son impact sur la conception du DHN est étudié dans deux études de cas. Alors que l'un se concentre sur les benchmarks pour différentes options de conception en utilisant une métrique de durabilité multicritères, un autre donne des indications détaillées sur l'utilité du cadre proposé pour la conception en évaluant l'impact de DSM sur les améliorations de conception possibles. / District heating networks (DHN) arean efficient way of providing thermal energy to consumers. Current state of the art shows that DHNs are developing towards smart thermal networks in integrated energy systems while their design is based upon the principles of sustainability. Based on that, this thesis covers two main research areas: Operation and design of district heating systems. In part A of this thesis, advanced methods for DHN operation are developed with the help of exergetic and thermoeconomic analysis. This includes the formulation of exergetic cost balances for graph-based network models. Intrinsic part is the deployment of an algebraic matrix, which determines the exergetic costs for dynamic system modeling. A case study of areal-existing network provides evidence that the proposed methodology offers new insights into individual allocation of costs which helps to assess the feasibility of third-party integration and the integration of distributed energy sources. In part B of this thesis, a new indicator called “load deviation index (LDI)” is proposed to link demand side measures (DSM) with the sustainable design of DHN systems. For that, abusiness-focused design frameworks proposed which takes the critical influences of DHN into account while avoiding a too high detail. DSM behavior is analyzed from a system perspective and its impact on DHN design is studied in two case studies. While one focuses on benchmarks for different design options using a multi-criteria sustainability metric, another gives detailed insights into the usefulness of the proposed framework for design purposes through assessing the impact of DSM on possible design improvements using a multi-objective optimization approach.

Submitted by Silvana Teresinha Dornelles Studzinski (sstudzinski) on 2016-10-06T16:09:54Z No. of bitstreams: 1 Renato de Oliveira Bastos_.pdf: 714555 bytes, checksum: 476142dafb33d63a833c92e4fafec40c (MD5) / Made available in DSpace on 2016-10-06T16:09:54Z (GMT). No. of bitstreams: 1 Renato de Oliveira Bastos_.pdf: 714555 bytes, checksum: 476142dafb33d63a833c92e4fafec40c (MD5) Previous issue date: 2016-07-29 / IFTO - Instituto Federal de Educação, Ciência e Tecnologia do Tocantins / O problema de seleção de fornecedores vem sendo abordado com maior relevância e importância pelas organizações, uma vez que por meio da escolha e seleção adequada dos fornecedores os resultados econômicos podem ser bem significativos. A necessidade de instituições públicas ou privadas de reduzir gastos, de buscar produtos e serviços de melhor qualidade, procurando melhorar sua competitividade ou mesmo sua estabilidade no mercado, vem fazendo com que o tema de seleção de fornecedores tenha um papel estratégico nas organizações. Os modelos de seleção atuais praticados pela grande maioria das organizações buscam basicamente minimizar os custos, deixando de lado outros critérios importantes para a escolha dos fornecedores. O presente trabalho propõe uma avaliação do modelo atual de seleção de fornecedores dentro do Instituto Federal do Tocantins (IFTO) bem como a criação de dois modelos multicritério de apoio a decisão. A pesquisa tem uma abordagem qualitativa na formulação do problema e identificação dos critérios relevantes, e quantitativa para a construção dos modelos multicritério e análises dos resultados. Os dois modelos de apoio a decisão foram construídos utilizando os métodos multicritério AHP e VIKOR. Para o estudo aplicado, foram avaliados seis fornecedores em relação aos critérios qualidade, custo, entrega e localização geográfica. Os modelos foram criados a partir de análises sobre as avaliações de entrevistas com quatro especialistas dos setores de compra do IFTO campus Araguaína. Com os resultados dos dois modelos construídos, foi realizada uma comparação entre eles e também em relação ao modelo de seleção de fornecedores praticado atualmente no IFTO. Após as comparações dos modelos, realizou-se uma análise de sensibilidade, onde observou-se que o modelo VIKOR mostrou-se como o mais adequado e indicado para a seleção de fornecedores no âmbito do IFTO. / The problem of selection of suppliers has been addressed with greater relevance and importance for the organizations, since a proper choice and selection of suppliers can bring significant economic results. The need for public and private institutions to reduce costs, to get better quality products and services, looking to improve their competitiveness or even its stability in the market, is causing the supplier selection issue a strategic role in organizations. The current selection models employed by the vast majority of organizations seek to minimize costs, basically leaving aside other important criteria for the choice of suppliers. The present work proposes the assessment of the current model of selection of suppliers within the Federal Institute of Tocantins (IFTO) as well as the creation of two multicriteria decision support models. The research has a qualitative approach in problem formulation and identification of relevant and quantitative criteria for the construction of the multi-criteria models and analysis of results. The two proposed models to support decision have been built using the multi-criteria methods AHP and VIKOR. For the study applied, six vendors were evaluated in relation to quality, cost, delivery criteria and geographic location. The decision models were created from analysis of the evaluations of interviews with four experts in the purchase sector of the IFTO campus Araguaína. With the results of the two proposed models, a comparison was made between them and also in relation to vendor selection model currently practiced in the IFTO. After comparisons of the models, a sensitivity analysis was conducted, where it was noted that the VIKOR model showed up as the most appropriate and suitable for the selection of suppliers within the IFTO.

The development of an index to compare different sources of energy is presented; the index address the appraisal of the source of energy from its sustainable performance and also using the factors that influence the user's decision making process of adopting an alternative energy. The index is used to compare the fuel cell system and the traditional grid system powered by coal fired power plants, for a typical residential unit located in the rural Appalachian region in Ohio.

Visų Lietuvoje esančių ežerų valymo darbai, sapropelio kuopimas atliekamas mechaniniu bei hidrauliniu būdais. Pastarasis sapropelio gavybos bei ežero išvalymo būdas paplitęs plačiausiai, nes gamybinės organizacijos dažniausiai naudoja technologiją, kai sapropelis pumpuojamas į specialiai tam paruoštus sėsdintuvus. Sapropelio gavyba bei ežero išvalymas atliekamas žemsiurbės pagalba. Tyrimų tikslas - parinkti geriausią žemsiurbę užpelkėjantiems ežerams valyti. Darbe pateikiama metodika, leidžianti tinkamiausią žemsiurbę išsirinkti pagal penkis kriterijus. Vertintos rusiškos, baltarusiškos, vakarietiškos taip pat anksčiau Lietuvoje naudotos žemsiurbės. Žemsiurbės vertintos daugiakriterinės analizės ELECTRE ir MAUT metodais. Daugiakriterinė analizė atlikta panaudojant programines įrangas HYPSE ir DAM. Už konsultacijas, rengiant, magistrantūros studijų baigiamąjį darbą reiškiu padėką: Doc. dr. A. Ciūniui, lekt. E. Laurinavičiui ir prof. habil. dr. L. Katkevičiui. / The cleaning works of all Lithuanian lakes, excavation of sapropel are carried out either by mechanical or hydraulic means. The latter is the common means of sapropel extraction and lake cleaning. Industrial organizations usually apply technologies so that sapropel is pumped to specially prepared sedimentation tanks. The cleaning of a lake and extraction of sapropel is carried out by the means of a dredger. The aim of the research is to choose the best dredger for the cleaning of swampy lakes. The work discusses methods which allow choosing the best dredger according to five criteria. Russian, Byelorussian, western dredgers and dredgers used in Lithuania earlier have been evaluated following the multi-criteria ELECTRE and MAUT methods. Multi-criteria analysis was carried out using HYPSE and DAM software.