In this thesis, we address the route selection problem for Unmanned Air Vehicles (UAV) under multiple objectives. We consider a general case for this problem where the UAV has to visit several targets and return to the base. For this case, there are multiple combinatorial problems to be considered. First, the paths to be followed between any pairs of targets should be determined. This part can be considered as a multi-objective shortest path problem. Additionally, we need to determine the order of the targets to be visited. This in turn, is a multi-objective traveling salesperson problem. The overall problem is a combination of these two combinatorial problems. The route selection for UAVs has been studied by several researchers, mainly in the military context. They considered a linear combination of the two objectives / minimizing distance traveled and minimizing radar detection threat / and proposed heuristics for the minimization of the composite single objective problem. We treat these two objectives separately. We develop an evolutionary algorithm to determine the efficient tours. We also consider an exact interactive approach to identify the best paths and tours of a decision maker. We tested the two solution approaches on both small-sized and large-sized problem instances.

The interval programming model (IvP) is a mathematical programmingmodel for representing and solving multi-objective optimizationproblems. The central characteristic of the model is the use ofpiecewise linearly defined objective functions and a solution methodthat searches through the combination space of pieces rather thanthrough the actual decision space. The piecewise functions typicallyrepresent an approximation of some underlying function, but thisconcession is balanced on the positive side by relative freedom fromfunction form assumptions as well as the assurance of global optimality.In this paper the model and solution algorithms are described, and theapplicability of IvP to certain applications arediscussed.

Within the past two decades, the planning arena has changed considerably and increasing awareness of the impacts of utility generation, intensifying pressure from the public and regulators, and growing competition from other energy and electricity suppliers have made the utility planning process rather complex. The variety of players in utility planning has introduced new priorities and a new set of competing objectives. Increased resource scarcity, the requirement for economic efficiency and the need to view the electricity production and utilization process in its entirety also necessitate an integrated resource planning approach, resulting in a wider array of expansion alternatives that must be evaluated. Another characteristic that makes planning so complicated is the uncertainty in the factors that influence the cost of the power system plan. Public concern for the environment has resulted in a series of legislations for controlling emissions of acid rain precursors (SO₂ and NO_x) and other pollutants. More and more regulators are also requiring electric utilities to internalize environmental externalities in their planning processes. The potential for new legislation on currently uncontrolled effluents like CO₂ likewise remains. There is thus a need to examine the modeling of emissions that would reflect not only the cost of control but the environmental impacts of these emissions as well. This thesis combines the features of the trade-off and decision analysis techniques to address the multiplicity of objectives and the uncertainties of planning. It draws on Saaty's analytic hierarchy process (AHP) and the interdependent data analysis (IDA) technique developed at Virginia Tech to develop priority weights among objectives and probability distributions of uncertainties. It elucidates the relationship between the competing techniques of trade-off analysis and the method of weights in terms of the economic theory of the firm. The confidence intervals determined with the IDA technique are then used to obtain a range of alternatives that satisfy the requirements of both approaches for evaluation by the decision maker (DM). Special attention is given to the environmental impacts of the generation plan and the model accounts for these issues as attributes in the planning process as well as being legislation uncertainties. / Ph. D.

The overall goals of this dissertation are to investigate the sustainability of the built environment, holistically, by assessing its Triple Bottom Line (TBL): environmental, economic, and social impacts, as well as propose cost-effective, socially acceptable, and environmentally benign policies using several decision support models. This research is anticipated to transform life cycle assessment (LCA) of the built environment by using a TBL framework, integrated with economic input-output analysis, simulation, and multicriteria optimization tools. The major objectives of the outlined research are to (1) build a system-based TBL sustainability assessment framework for the sustainable built environment, by (a) advancing a national TBL-LCA model which is not available for the United States of America; (b) extending the integrated sustainability framework through environmental, economic, and social sustainability indicators; and (2) develop a systembased analysis toolbox for sustainable decisions including Monte Carlo simulation and multi-criteria compromise programming. When analyzing the total sustainability impacts by each U.S. construction sector, “Residential Permanent Single and Multi-Family Structures" and "Other Non-residential Structures" are found to have the highest environmental, economic, and social impacts compared to other construction sectors. The analysis results also show that indirect suppliers of construction sectors have the largest sustainability impacts compared to onsite activities. For example, for all U.S. construction sectors, on-site construction processes are found to be responsible for less than 5 % of total water consumption, whereas about 95 iv % of total water use can be attributed to indirect suppliers. In addition, Scope 3 emissions are responsible for the highest carbon emissions compared to Scope 1 and 2. Therefore, using narrowly defined system boundaries by ignoring supply chain-related impacts can result in underestimation of TBL sustainability impacts of the U.S. construction industry. Residential buildings have higher shares in the most of the sustainability impact categories compared to other construction sectors. Analysis results revealed that construction phase, electricity use, and commuting played important role in much of the sustainability impact categories. Natural gas and electricity consumption accounted for 72% and 78% of the total energy consumed in the U.S. residential buildings. Also, the electricity use was the most dominant component of the environmental impacts with more than 50% of greenhouse gases emitted and energy used through all life stages. Furthermore, electricity generation was responsible for 60% of the total water withdrawal of residential buildings, which was even greater than the direct water consumption in residential buildings. In addition, construction phase had the largest share in income category with 60% of the total income generated through residential building’s life cycle. Residential construction sector and its supply chain were responsible for 36% of the import, 40% of the gross operating surplus, and 50% of the gross domestic product. The most sensitive parameters were construction activities and its multiplier in most the sustainability impact categories. v In addition, several emerging pavement types are analyzed using a hybrid TBL-LCA framework. Warm-mix Asphalts (WMAs) did not perform better in terms of environmental impacts compared to Hot-mix Asphalt (HMA). Asphamin® WMA was found to have the highest environmental and socio-economic impacts compared to other pavement types. Material extractions and processing phase had the highest contribution to all environmental impact indicators that shows the importance of cleaner production strategies for pavement materials. Based on stochastic compromise programming results, in a balanced weighting situation, Sasobit® WMA had the highest percentage of allocation (61%), while only socio-economic aspects matter, Asphamin® WMA had the largest share (57%) among the WMA and HMA mixtures. The optimization results also supported the significance of an increased WMA use in the United States for sustainable pavement construction. Consequently, the outcomes of this dissertation will advance the state of the art in built environment sustainability research by investigating novel efficient methodologies capable of offering optimized policy recommendations by taking the TBL impacts of supply chain into account. It is expected that the results of this research would facilitate better sustainability decisions in the adoption of system-based TBL thinking in the construction field.

<p>Post-disaster temporary housing has been a significant challenge for the emergency management group and industries for many years. According to reports by the Department of Homeland Security (DHS), housing in states and territories is ranked as the second to last proficient in 32 core capabilities for preparedness.The number of temporary housing required in a geographic area is influenced by a variety of factors, including social issues, financial concerns, labor workforce availability, and climate conditions. Acknowledging and creating a balance between these interconnected needs is considered as one of the main challenges that need to be addressed. Post-disaster temporary housing is a multi-objective process, thus reaching the optimized model relies on how different elements and objectives interact, sometimes even conflicting, with each other. This makes decision making in post-disaster construction more restricted and challenging, which has caused ineffective management in post-disaster housing reconstruction.</p> <p>Few researches have studied the use of Artificial Intelligence modeling to reduce the time and cost of post-disaster sheltering. However, there is a lack of research and knowledge gap regarding the selection and the magnitude of effect of different factors of the most optimized type of Temporary Housing Units (THU) in a post-disaster event.</p> The proposed framework in this research uses supervised machine learing to maximize certain design aspects of and minimize some of the difficulties to better support creating temporary houses in post-disaster situations. The outcome in this study is the classification type of the THU, more particularly, classifying THUs based on whether they are built on-site or off-site. In order to collect primary data for creating the model and evaluating the magnitude of effect for each factor in the process, a set of surveys were distributed between the key players and policymakers who play a role in providing temporary housing to people affected by natural disasters in the United States. The outcome of this framework benefits from tacit knowledge of the experts in the field to show the challenges and issues in the subject. The result of this study is a data-based multi-objective decision-making tool for selecting the THU type. Using this tool, policymakers who are in charge of selecting and allocating post-disaster accommodations can select the THU type most responsive to the local needs and characteristics of the affected people in each natural disaster.

Problem: Engineering design decisions require the integration of information from multiple and disparate sources. However, this information is often independently created, limited to a single perspective, and not formally represented, thus making it difficult to formulate decisions. Hence, the primary challenge is the development of computational representations that facilitate the exchange of information for decision support. Approach: First, the scope of this research is limited to representing design decisions as compromise decision support problems (cDSP). To address this challenge, the primary hypothesis is that a formal language will enable the semantics of cDSP to be captured, thus providing a digital interface through which design information can be exchanged. The primary hypothesis is answered through the development of a description logic (DL) based formal language. The primary research question is addressed in four sub-questions. The first two research questions relate to the development of a vocabulary for representing the semantics of the cDSP. The first hypothesis used to answer this question is that formal information modeling techniques can be used to explicitly capture the semantics and structure of the cDSP. The second research question is focused on the realization of a computer-processible representation. The hypothesis used to answer this question is that DL can be used for developing computational-based representations. The third research question is related to the organization and retrieval of decision information. The hypothesis used to answer this question is DL reasoning algorithms can be used to support organization and retrieval. Validation: The formal language developed in this dissertation is theoretically and empirically validated using the validation square approach. Validation of the hypotheses is achieved by systematically building confidence through example problems. Examples include the cDSP construct, analysis support models, the design of a cantilever beam, and design of a structural fin array heat sink. Contributions: The primary contribution from this dissertation is a formal language for capturing the semantics of cDSPs and analysis support models comprised of: (1) a systematic methodology for decision formulation, (2) a cDSP vocabulary, (3) a graphical information model, and (4) a DL-based representation. The components, collectively, provide a means for exchanging cDSP information.

[ES] La colaboración empresarial evidenciada en pequeñas y medianas empresas (Pymes) está contribuyendo a ampliar su competitividad, impulsar diversos procesos de innovación y mejorar su rendimiento; siendo, por tanto, fundamental la medición eficaz del rendimiento como una práctica estratégica para impulsar su desarrollo y eficiencia colectiva. La medición del rendimiento (MR) es un elemento esencial para la planificación efectiva y el control empresarial; así como para la toma de decisiones, a fin de desplegar diferentes acciones de mejora. La MR en Pymes incluye las siguientes tres categorías: las medidas de rendimiento o indicadores, el diseño del sistema de medición del rendimiento (SMR) y su desarrollo. El diseño del SMR para redes de Pymes es un proceso importante para asegurar que el marco de medición integre tanto, los factores y elementos del rendimiento propios del contexto colaborativo abordado, así como los métodos y técnicas para un proceso de medición del rendimiento balanceado y con alineamiento estratégico. Sin embargo, en la literatura fueron pocos los estudios que abordaban a la MR en contextos colaborativos. Entre aquellos que lo hacían, la mayoría se relacionaba con el direccionamiento hacia las mejores prácticas; lo que señaló dificultades en cuanto a la consideración de diversos factores entorno a este grupo de Pymes y con ello su implicación en el desarrollo de SMRs específicos. Otro aspecto importante en el diseño del SMR es la presencia de múltiples tomadores de decisión, espacio que tampoco evidenció mayor aporte entre la literatura revisada. Al considerar estos aspectos en el marco del diseño de SMRs para redes de Pymes en colaboración, ninguna investigación presentó un abordaje que contemple todas las características de forma simultánea. Considerando estas brechas, este trabajo de investigación tiene por objetivo proponer un sistema de medición del rendimiento para redes colaborativas de pymes (SMR - RECOP) en un escenario de toma de decisiones en grupo, considerando un enfoque de alineamiento estratégico. La propuesta tiene como finalidad integrar los principales factores de influencia del entorno de la red de Pymes, los requerimientos de medición básicos y la visión de un crecimiento sostenible enmarcado en la eficiencia colectiva. La propuesta de medición del rendimiento utiliza el Balanced Scorecard (BSC) como herramienta para direccionar la estrategia de la red al interior del sistema de medición, donde los indicadores se encuentran en alineación directa con los objetivos estratégicos; además, la técnica Fuzzy TOPSIS para apoyar el proceso de toma de decisiones en grupo que permite la determinación de los objetivos estratégicos y; por último, mesas de diálogo como los espacios para la discusión de ideas y formulación de indicadores de medición. Estas técnicas, juntamente con los elementos citados anteriormente son integrados en una metodología de tres fases. El sistema de medición propuesto se aplica en un caso de investigación para fines de validación; la red de Pymes evaluada pertenece al sector agroindustrial productor de cacao en Ecuador, donde los contextos empresariales tanto de red y cadena se evidencian como las estratégicas colaborativas con importante presencia. La aplicación empírica del SMR - RECOP mostró como resultados necesarios de su desarrollo a los siguientes productos: un conjunto de objetivos estratégicos; un procedimiento establecido para la definición y selección de estos objetivos en el marco de la toma de decisiones en grupo; un mapa estratégico consolidado y por último un conjunto de indicadores de rendimiento. Estos resultados muestran consistencia con los estamentos pretendidos por la red y su contexto de desarrollo; así como con los requerimientos que enmarcan un SMR para Pymes. / [CA] La col·laboració empresarial evidenciada en petites i mitjanes empreses (Pimes) està contribuint a ampliar la seva competitivitat, impulsar diversos processos d'innovació i millorar el seu rendiment; sent, per tant, fonamental el mesurament eficaç de l'rendiment com una pràctica estratègica per impulsar el seu desenvolupament i eficiència col·lectiva. El mesurament de l'rendiment (MR) és un element essencial per a la planificació efectiva i el control empresarial; així com per a la presa de decisions, per tal de desplegar diferents accions de millora. La MR a Pimes inclou les següents tres categories: les mesures de rendiment o indicadors, el disseny de sistema de mesurament de l'rendiment (SMR) i el seu desenvolupament. El disseny de l'SMR per a xarxes de Pimes és un procés important per assegurar que el marc de mesurament integri tant, els factors i elements de l'rendiment propis de l'context col·laboratiu abordat, així com els mètodes i tècniques per a un procés de mesurament de l'rendiment balancejat i amb alineament estratègic. No obstant això, en la literatura van ser pocs els estudis que abordaven a la MR en contextos col·laboratius. Entre aquells que ho feien, la majoria es relacionava amb l'adreçament cap a les millors pràctiques; el que va assenyalar dificultats pel que fa a la consideració de diversos factors entorn a aquest grup de Pimes i amb això la seva implicació en el desenvolupament de SMRs específics. Un altre aspecte important en el disseny de l'SMR és la presència de múltiples prenedors de decisió, espai que tampoc va evidenciar major aportació entre la literatura revisada. A l'considerar aquests aspectes en el marc de el disseny de SMRs per a xarxes de pimes en col·laboració, cap investigació va presentar un abordatge que contempli totes les característiques de forma simultània. Considerant aquestes bretxes, aquest treball de recerca té per objectiu proposar un sistema de mesurament de l'rendiment per a xarxes col·laboratives de pimes (SMR - Recull) en un escenari de presa de decisions en grup, considerant un enfocament d'alineament estratègic. La proposta té com a finalitat integrar els principals factors d'influència de l'entorn de la xarxa de pimes, els requeriments de mesurament bàsics i la visió d'un creixement sostenible emmarcat en l'eficiència col·lectiva. La proposta de mesurament de l'rendiment utilitza el Balanced Scorecard (BSC) com a eina per adreçar l'estratègia de la xarxa a l'interior de el sistema de mesurament, on els indicadors es troben en alineació directa amb els objectius estratègics; a més, la tècnica Fuzzy TOPSIS per donar suport al procés de presa de decisions en grup que permet la determinació dels objectius estratègics i; finalment, taules de diàleg com els espais per a la discussió d'idees i formulació d'indicadors de mesurament. Aquestes tècniques, conjuntament amb els elements esmentats anteriorment són integrats en una metodologia de tres fases. El sistema de mesurament proposat s'aplica en un cas d'investigació per a fins de validació; la xarxa de Pimes avaluada pertany a el sector agroindustrial productor de cacau a l'Equador, on els contextos empresarials tant de xarxa i cadena s'evidencien com les estratègiques col·laboratives amb important presència. L'aplicació empírica d'el SMR - RECOP va mostrar com a resultats necessaris del seu desenvolupament als següents productes: un conjunt d'objectius estratègics; un procediment per a la definició i selecció d'aquests objectius en el marc de la presa de decisions en grup; un mapa estratègic consolidat i finalment un conjunt d'indicadors de rendiment. Els resultats obtinguts mostren consistència amb els estaments pretesos per la xarxa i el seu context de desenvolupament; així com amb els requeriments que emmarquen un SMR per a Pimes. / [EN] The business collaboration evidenced in small and medium-sized companies (SMEs) is helping to expand their competitiveness, promote different innovation processes, and improve their performance. Therefore, effective performance measurement is essential as a strategic practice to promote its development and collective efficiency. Performance measurement (PM) is an essential element for effective business planning and control; as well as for decision making, in order to deploy different improvement actions. PM in SMEs includes the following three categories: performance measures or indicators, the design of the performance measurement system (PMS), and its development. The design of the PMS for SME networks is an important process to ensure that the measurement framework integrates both the factors and elements of the performance, which belong to the collaborative context addressed, as well as the methods and techniques for a balanced performance measurement process and with strategic alignment. However, in the literature, few studies addressed PM in collaborative contexts. Among those that did it, the majority was related to directing toward best practices; which pointed to difficulties in considering various factors around this group of SMEs and thus their involvement in the development of specific PMSs. Another important issue in the design of the PMS is the presence of multiple decision-makers, a space that did not show a greater contribution among the literature reviewed. When considering these aspects in the framework of PMSs design for collaborative SME networks, no research presented an approach that considers all the characteristics simultaneously. Considering these gaps, this research work aims to propose a performance measurement system for collaborative networks of SMEs (PMS - RECOP) in a group decision-making scenario, considering a strategic alignment approach. The purpose of the proposal is to integrate the main factors that influence the environment of the SMEs network, the basic measurement requirements, and the vision of sustainable growth framed in collective efficiency The performance measurement proposal uses the Balanced Scorecard (BSC) as a tool to direct the strategy of the network within the measurement system, where the indicators are in direct alignment with the strategic objectives. In addition, the Fuzzy TOPSIS technique supports the group decision-making process that allows the determination of strategic objectives and; finally, dialogue tables as spaces for the discussion of ideas and formulation of measurement indicators. These techniques, together with the elements aforementioned, are integrated into a three-phase methodology. The proposed evaluation system is applied in a research case for validation purposes; the network of SMEs evaluated belongs to the agro-industrial sector that produces cocoa in Ecuador, where the business contexts of both the network and the chain are evidenced as collaborative strategies with an important presence. The empirical application of the PMS - RECOP showed the following products as necessary results of its development: a set of strategic objectives, such as an established procedure for the definition and selection of these objectives within the framework of group decision-making; a consolidated strategic map, and finally a set of performance indicators. The obtained results showed consistency with the states intended by the network and its development context, as well as the requirements that frame a PMS for SMEs. / Rojas Lema, XB. (2021). Sistema de medición del rendimiento para redes colaborativas de Pymes en el sector agroindustrial de Ecuador [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/165779 / TESIS