This dissertation formulates and develops models and solution approaches for plug-in electric vehicle (PEV) charging station installation. The models are formulated in the form of bilevel programming and stochastic programming problems, while a meta-heuristic method, genetic algorithm, and Monte Carlo bounding techniques are used to solve the problems. Demand for PEVs is increasing with the growing concerns about environment pollution, energy resources, and the economy. However, battery capacity in PEVs is still limited and represents one of the key barriers to a more widespread adoption of PEVs. It is expected that drivers who have long-distance commutes hesitate to replace their internal combustion engine vehicles with PEVs due to range anxiety. To address this concern, PEV infrastructure can be developed to provide re-fully status when they are needed. This dissertation is primarily focused on the development of mathematical models that can be used to support decisions regarding a charging station location and installation problem. The major parts of developing the models included identification of the problem, development of mathematical models in the form of bilevel and stochastic programming problems, and development of a solution approach using a meta-heuristic method. PEV parking building problem was formulated as a bilevel programming problem in order to consider interaction between transportation flow and a manager decisions, while the charging station installation problem was formulated as a stochastic programming problem in order to consider uncertainty in parameters. In order to find the best-quality solution, a genetic algorithm method was used because the formulation problems are NP-hard. In addition, the Monte Carlo bounding method was used to solve the stochastic program with continuous distributions. Managerial implications and recommendations for PEV parking building developers and managers were suggested in terms of sensitivity analysis. First, in the planning stage, the developer of the PEV parking building should consider long-term changes in future traffic flow and locate a PEV parking building closer to the node with the highest destination trip rate. Second, to attract more parking users, the operator needs to consider the walkability of walking links.

The study intended to investigate whether Zimbabwe possesses realistic potential export opportunities that can lead to the sustainable reconstruction of its economy. The study was initiated on the premise that Zimbabwe is a fragile state and a post-conflict country going through reconstruction. The study also premised itself on the foundation that the current recovery efforts by Zimbabwe – although they have yielded some positive results, have still fallen short of providing sustainable economic growth without meaningful deeper reforms. Hence, this study is an attempt to provide policy makers with an alternative researched export promotion strategy with a focus on realistic potential opportunities. The study employed two techniques, namely survey of literature and empirical investigation. The survey of literature was achieved through theoretical literature on post-conflict reconstruction. Exports were identified in the various experiences of those countries that have gone through post-conflict reconstruction and still managed to use them in their recovery process. This necessitated a thorough investigation of literature to draw a theory upon which exports promotion could rely. The major theory that was surveyed in the literature is exportled growth (ELG). The theory is based on the premise that exports influence economic growth. Empirical evidence through literature was established in the studies carried out in different countries supporting the hypothesis. The theory was seen as superior to the import substitution strategy which led many developing countries to lag behind those which adopted export-led growth policies. The other aspect of empirical investigation was carried out through the application of the Decision Support Model (DSM). This is a scientific model that is used as a method of market selection. The model’s 4 filters were modified to include a 5th filter to specifically take into account the special circumstances of Zimbabwe. The 5th filter extension of the model provided a substantial contribution by this study to the model. A proxy of Zimbabwe’s neighbours – namely Botswana, Mozambique, Namibia, South Africa and Zambia was used to reinforce Zimbabwe’s competitiveness. This was based on the assumption that if Zimbabwe’s neighbours under similar conditions can successfully penetrate certain markets, then Zimbabwe should not find it difficult to penetrate the same markets. This empirical investigation showed that Zimbabwe does possess realistic potential export opportunities. The results identified 344 realistic export opportunities (REOs) for Zimbabwe in 17 regions, 50 countries, 13 sectors and 112 product lines. The study observed that Zimbabwe is in fact not utilising much of the REOs. In order to enable Zimbabwe to utilise the REOs, the study developed an appropriate export promotion strategy. The export promotion strategy is based on the results obtained from empirical investigation. The export promotion strategy has sub-strategies which respond to the specific needs of individual sectors and individual markets. The study established that instead of spending resources in an unfocused manner, the meagre resources can be applied to a more focused export promotion strategy. Based on the experiences of other countries that have gone through a similar post-conflict reconstruction process and have also used the theoretical conceptual framework of the export-led growth theory, the DSM results show there are realistic export opportunities (REOs) and these may contribute towards economic growth and recovery. The study further provided recommendations on how Zimbabwe could realise realistic potential export opportunities. This study has made a three-fold contribution. Firstly, a contribution has been made to the literature on post-conflict reconstruction and export promotion. Secondly, a significant contribution has been made by extending the Decision Support Model with a 5thfilter that also considers the supply side in the model. Finally, it has formulated an export promotion strategy, which can be applied by policy makers in Zimbabwe. / Thesis (PhD (Economics))--North-West University, Potchefstroom Campus, 2013.

The study intended to investigate whether Zimbabwe possesses realistic potential export opportunities that can lead to the sustainable reconstruction of its economy. The study was initiated on the premise that Zimbabwe is a fragile state and a post-conflict country going through reconstruction. The study also premised itself on the foundation that the current recovery efforts by Zimbabwe – although they have yielded some positive results, have still fallen short of providing sustainable economic growth without meaningful deeper reforms. Hence, this study is an attempt to provide policy makers with an alternative researched export promotion strategy with a focus on realistic potential opportunities. The study employed two techniques, namely survey of literature and empirical investigation. The survey of literature was achieved through theoretical literature on post-conflict reconstruction. Exports were identified in the various experiences of those countries that have gone through post-conflict reconstruction and still managed to use them in their recovery process. This necessitated a thorough investigation of literature to draw a theory upon which exports promotion could rely. The major theory that was surveyed in the literature is exportled growth (ELG). The theory is based on the premise that exports influence economic growth. Empirical evidence through literature was established in the studies carried out in different countries supporting the hypothesis. The theory was seen as superior to the import substitution strategy which led many developing countries to lag behind those which adopted export-led growth policies. The other aspect of empirical investigation was carried out through the application of the Decision Support Model (DSM). This is a scientific model that is used as a method of market selection. The model’s 4 filters were modified to include a 5th filter to specifically take into account the special circumstances of Zimbabwe. The 5th filter extension of the model provided a substantial contribution by this study to the model. A proxy of Zimbabwe’s neighbours – namely Botswana, Mozambique, Namibia, South Africa and Zambia was used to reinforce Zimbabwe’s competitiveness. This was based on the assumption that if Zimbabwe’s neighbours under similar conditions can successfully penetrate certain markets, then Zimbabwe should not find it difficult to penetrate the same markets. This empirical investigation showed that Zimbabwe does possess realistic potential export opportunities. The results identified 344 realistic export opportunities (REOs) for Zimbabwe in 17 regions, 50 countries, 13 sectors and 112 product lines. The study observed that Zimbabwe is in fact not utilising much of the REOs. In order to enable Zimbabwe to utilise the REOs, the study developed an appropriate export promotion strategy. The export promotion strategy is based on the results obtained from empirical investigation. The export promotion strategy has sub-strategies which respond to the specific needs of individual sectors and individual markets. The study established that instead of spending resources in an unfocused manner, the meagre resources can be applied to a more focused export promotion strategy. Based on the experiences of other countries that have gone through a similar post-conflict reconstruction process and have also used the theoretical conceptual framework of the export-led growth theory, the DSM results show there are realistic export opportunities (REOs) and these may contribute towards economic growth and recovery. The study further provided recommendations on how Zimbabwe could realise realistic potential export opportunities. This study has made a three-fold contribution. Firstly, a contribution has been made to the literature on post-conflict reconstruction and export promotion. Secondly, a significant contribution has been made by extending the Decision Support Model with a 5thfilter that also considers the supply side in the model. Finally, it has formulated an export promotion strategy, which can be applied by policy makers in Zimbabwe. / Thesis (PhD (Economics))--North-West University, Potchefstroom Campus, 2013.

As part of the Accelerated Shared Growth Initiative of South Africa (AsgiSA), the South African government is focusing on improving the country's export performance (Department of Trade and Industry, 2006a). One of the objectives of the Department of Trade and Industry (DTI) is to increase the level of South African exports through the development and implementation of strategies for targeted markets. The DTI commissioned a study to scientifically identify priority products and markets in order to justify its export promotion activities and to ensure that government resources are effectively allocated. Tills led to the development of the Decision Support Model (DSM) by Viviers and Pearson (2007) as an instrument to identify realistic export opportunities for South Africa. The Viviers and Pearson (2007) study adapted and refined the methodology of Cuyvers et al. (1995) to the South African circumstances and used a sequential filtering process to identify realistic product/market export combinations for South Africa. The outcome of the DSM for South Africa was 9690 SITC product/market opportunities in seventy-four countries, clustered in twelve geographic regions. One of these regions was the Middle East. The DTI indicated the need for a study on South Africa's export opportunities to the Middle East as a result of their prioritisation of regions for export promotion. This need is therefore the rationale of this study. The research objectives were to analyse the identified Middle East countries and determine the product with the most realistic export opportunities to two of the Middle East countries and lastly, to develop a market profile to assist the DTI in promoting the exports of this product to these countries. In this study, several methods of product and market selection were investigated in order to determine the most suitable method to identify the product/market opportunities from the DSM to the Middle East. The product selection method selected involved a three-phase filtering process to determine the product with the highest export potential to the Middle East. The analysis was based on a cluster-selection process. It was determined that fruit juice was the product with the highest export potential to the region. The market selection process used a composite market potential index to determine which country in the Middle East had the highest potential for exports of fruit juice from South Africa. The two countries in the Middle East with the highest potential to import fruit juice from South Africa were Oman and Qatar. A market profile for the export of fruit juice to Oman and Qatar was developed. The market profile provided an economic overview of the two markets, analysed the market potential of fruit juice and provided technical information regarding the requirements for the export of fruit juice by South Africa to Oman and Qatar. The results of this study firstly indicate to the DTI and exporters that South Africa should export fruit juice to Oman and Qatar and secondly presents a market profile with detailed information of the process to follow in exporting fruit juice to these countries. / Thesis (M.Com. (International Commerce))--North-West University, Potchefstroom Campus, 2010.

As part of the Accelerated Shared Growth Initiative of South Africa (AsgiSA), the South African government is focusing on improving the country's export performance (Department of Trade and Industry, 2006a). One of the objectives of the Department of Trade and Industry (DTI) is to increase the level of South African exports through the development and implementation of strategies for targeted markets. The DTI commissioned a study to scientifically identify priority products and markets in order to justify its export promotion activities and to ensure that government resources are effectively allocated. Tills led to the development of the Decision Support Model (DSM) by Viviers and Pearson (2007) as an instrument to identify realistic export opportunities for South Africa. The Viviers and Pearson (2007) study adapted and refined the methodology of Cuyvers et al. (1995) to the South African circumstances and used a sequential filtering process to identify realistic product/market export combinations for South Africa. The outcome of the DSM for South Africa was 9690 SITC product/market opportunities in seventy-four countries, clustered in twelve geographic regions. One of these regions was the Middle East. The DTI indicated the need for a study on South Africa's export opportunities to the Middle East as a result of their prioritisation of regions for export promotion. This need is therefore the rationale of this study. The research objectives were to analyse the identified Middle East countries and determine the product with the most realistic export opportunities to two of the Middle East countries and lastly, to develop a market profile to assist the DTI in promoting the exports of this product to these countries. In this study, several methods of product and market selection were investigated in order to determine the most suitable method to identify the product/market opportunities from the DSM to the Middle East. The product selection method selected involved a three-phase filtering process to determine the product with the highest export potential to the Middle East. The analysis was based on a cluster-selection process. It was determined that fruit juice was the product with the highest export potential to the region. The market selection process used a composite market potential index to determine which country in the Middle East had the highest potential for exports of fruit juice from South Africa. The two countries in the Middle East with the highest potential to import fruit juice from South Africa were Oman and Qatar. A market profile for the export of fruit juice to Oman and Qatar was developed. The market profile provided an economic overview of the two markets, analysed the market potential of fruit juice and provided technical information regarding the requirements for the export of fruit juice by South Africa to Oman and Qatar. The results of this study firstly indicate to the DTI and exporters that South Africa should export fruit juice to Oman and Qatar and secondly presents a market profile with detailed information of the process to follow in exporting fruit juice to these countries. / Thesis (M.Com. (International Commerce))--North-West University, Potchefstroom Campus, 2010.

Este trabalho analisa a viabilidade de aplicação de uma sistemática de gestão de estoques que permite escolher e parametrizar modelos de decisão de reposição de itens para apoiar os coordenadores de abastecimento de supermercados, através da utilização de dados reais. O principal objetivo desta sistemática é contribuir para o aumento da disponibilidade de produtos na loja do supermercado, através do seguinte equacionamento: minimizar os custos operacionais e de estoque do varejo, tendo como restrição um nível mínimo de serviço ao cliente. Esta pesquisa experimental aplicada possibilitou identificar que o modelo CALNEC apresentou o melhor desempenho em 80% da amostra. A melhor configuração (configuração dos melhores desempenhos de todos os modelos) ofereceu uma economia de até 42% frente ao custo atual. O modelo de gestão de estoque atualmente utilizado apresentou desempenho pior mesmo comparado aos modelos não vencedores. / This work analyses the viability of an application of the inventory management systematic, which allows to choose and to parameterize replenishment decision models to support supermarket replenishment coordinators in their tasks, using real data. The main objective of this systematic is to contribute to the product availability improvement in the supermarket store considering the following equation: minimize the operational and inventory costs from retail having as a restriction the minimum customer service level in items available at the retail store. This experimental applied research identified CALNEC as the inventory model that presented the best performance in 80% of the sample. The best configuration (configuration of the best performance from all models) showed a saving of 42% compared to the current costs. The current inventory management model presented the worst performance even compared to the non-winners models.

Resumo: O reservatório da Usina Hidrelétrica Ilha Solteira localiza-se entre os estados de São Paulo, Mato Grosso do Sul, Minas Gerais e Goiás inserindo-se na Bacia Hidrográfica do Rio Paraná. Este reservatório foi construído com o objetivo de geração de energia, porém, como geralmente ocorre com a maioria dos reservatórios, passou a ser utilizado para múltiplas finalidades. Dentre os usos se destacam o transporte hidroviário, a irrigação, a aquicultura e o lazer. Devido à boa qualidade de suas águas, apresenta uma forte tendência ao aumento das utilizações deste recurso. Considerando que alguns aproveitamentos resultam em impactos e consequentes conflitos relacionados aos interesses de usos do recurso, é de suma importância o desenvolvimento de medidas disciplinadoras que visem à manutenção da qualidade da água. Nesse sentido, a presente proposta objetivou estabelecer uma hierarquia dos principais usos do reservatório considerando critérios econômicos, sociais, operacionais e a qualidade da água. Para tanto, adotou-se um Modelo Multicritério de Apoio à Decisão, onde, com a utilização do método Analytic Hierarchy Process (AHP), as modalidades de uso do reservatório foram priorizadas. De acordo com o constatado no presente estudo, o segmento de recreação e turismo apresentou o melhor desempenho nos critérios avaliados, sendo considerado como prioridade global para a utilização da água do reservatório de Ilha Solteira e de seus afluentes. O uso dos recursos hídricos para irrigação se mostrou interessante, sendo que foi apontado como prioridade em alguns municípios. A aquicultura aparece em terceiro lugar na ordem de prioridade, se destacando tanto em projetos da iniciativa privada como em projetos com investimentos públicos. A região apresentou um baixo uso dos recursos hídricos para o transporte hidroviário, sendo este segmento quase uma exclusividade... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: The Ilha Solteira reservoir is located between the States of São Paulo, Mato Grosso do Sul, Minas Gerais and Goias, inserted in Paraná's river basin. This reservoir was built with the purpose of power generation, but as it usually happens with most reservoirs, it began to be used for multiple purposes. Among the various uses of the reservoir can be highlighted the navigation, the irrigation, the aquaculture and the recreation. Due to the high quality of its waters, there's a strong intent on increasing the use of this resource, being that some uses result in significant impact and therefore, conflicts of interest arise. It is then of utmost importance the creation of disciplinary measures targeted on maintaining water quality. In that sense, this proposal aims to establish a hierarchy of the main uses of the reservoir, considering the criteria economical, social, operational and the quality of the water. To that end, was adapted a Multi-Criteria Decision Support model, where, using the method of Analytic Hierarchy Process (AHP), the uses of the reservoir were prioritized. According to the results of this study, the segment of recreation and tourism showed the best performance on the evaluated criteria and was defined as the global priority concerning the water usage of the reservoir of Ilha Solteira and of their tributaries. The use of water resources for irrigation proved to be interesting, and it was appointed as a priority in some cities. The aquaculture appears in third place in the priority order, standing out so much in projects of the private initiative such as in projects with public investments. The region presented low use of water resources for waterborne transport, being that segment almost exclusiveness of the São Simão-GO city. The usage of the water to supply showed little expression on the cities in the region, however deserves attention for the volume of sewage... (Complete abstract click electronic access below) / Orientador: Milton Dall'Aglio Sobrinho / Coorientador: Maurício Augusto Leite / Banca: José Augusto de Lollo / Banca: Evaldo Luiz Gaeta Espíndola / Mestre

Este trabalho analisa a viabilidade de aplicação de uma sistemática de gestão de estoques que permite escolher e parametrizar modelos de decisão de reposição de itens para apoiar os coordenadores de abastecimento de supermercados, através da utilização de dados reais. O principal objetivo desta sistemática é contribuir para o aumento da disponibilidade de produtos na loja do supermercado, através do seguinte equacionamento: minimizar os custos operacionais e de estoque do varejo, tendo como restrição um nível mínimo de serviço ao cliente. Esta pesquisa experimental aplicada possibilitou identificar que o modelo CALNEC apresentou o melhor desempenho em 80% da amostra. A melhor configuração (configuração dos melhores desempenhos de todos os modelos) ofereceu uma economia de até 42% frente ao custo atual. O modelo de gestão de estoque atualmente utilizado apresentou desempenho pior mesmo comparado aos modelos não vencedores. / This work analyses the viability of an application of the inventory management systematic, which allows to choose and to parameterize replenishment decision models to support supermarket replenishment coordinators in their tasks, using real data. The main objective of this systematic is to contribute to the product availability improvement in the supermarket store considering the following equation: minimize the operational and inventory costs from retail having as a restriction the minimum customer service level in items available at the retail store. This experimental applied research identified CALNEC as the inventory model that presented the best performance in 80% of the sample. The best configuration (configuration of the best performance from all models) showed a saving of 42% compared to the current costs. The current inventory management model presented the worst performance even compared to the non-winners models.

Firm competitiveness is no longer an industry-specific or regional phenomenon, but it has evolved to have global impacts. The increase in intensity of regional and international competition, ineffectiveness of regional development policies and models has led to the focus on regional economic development. In particular, a focus on industrial cluster promotion, both in developed and developing countries has proliferated owing to their increased success as a sustainable source of economic growth and development. Industrial clusters are a geographically proximate group of inter-connected companies and associated institutions in a particular field, linked by commonalities and complementarities. In addition to industrial cluster formation, firms can also maintain competitiveness through internationalisation. Internationalisation ensures that firms are able to serve many markets from existing manufacturing bases without having to establish production plants in other markets. It reduces the over dependence on domestic markets and business risks associated with dependence on one market. This study identified industrial clusters for the North West Province (NWP) of South Africa using the Structural Path Analysis (SPA) method, as a strategy to enhance firm competitiveness. It contributes to the methods to identify industrial clusters by applying the Power of Pull (PoP) method to prioritise the number of clusters for the NWP. The ten identified industrial clusters and their respective PoP rankings were (i) communication; (ii) real estate; (iii) grain mill, bakery and animal feed products; (iv) building and other construction; (v) basic metal products; (vi) other food products; (vii) agriculture; (viii) non-metallic mineral products; (ix) trade; and (x) dairy products. This study identified the most important centres, in terms of the most contributions to output, employment and profit at the local municipal level across all the ten identified clusters. These centres were Madibeng, Rustenburg, City of Matlosana, Mafikeng and Ditsobotla. This indicates that efforts to stimulate cluster formation in this sector should be focused in these regions. This study also determined whether any association exists between the identified industrial clusters‟ products and services and the realistic export opportunities according to the DSM for products and the DSM for services. Four of the six product clusters were found to have REOs according to the DSM for products, namely grain mill, bakery and animal feeds products, agriculture, non-metallic mineral products and the basic metal products clusters. In terms of services, only two service clusters, namely communication and building and other construction services clusters, were found to have with REOs according to the DSM for services. This study further demonstrated the effects of industrial cluster formation on the regional economy, using social accounting matrix (SAM) multipliers. SAM multiplier analysis was used to demonstrate the output, employment, employment income and gross domestic product (GDP) supported by cluster formation for the NWP. The supported activity for the agriculture and trade clusters was less than the actual activity. The following clusters‟ supported activity was greater than the actual activity; communication; real estate; grain mill, bakery and animal feed products; building and other construction; basic metal products; other food products; non-metallic mineral products; and dairy products. The identified industrial clusters‟ REOs were explored further to provide more details on the products or services identified as having REOs. In addition, the countries to which the identified REOs (products and services) can be exported were discussed. In terms of product clusters identified to have REOs, the export potential values, cell classifications and market accessibility index scores were discussed. In terms of the service clusters identified as having REOs, countries, market access, market openness, import demand and cell classifications were discussed. / PhD (International Trade), North-West University, Potchefstroom Campus, 2014

Firm competitiveness is no longer an industry-specific or regional phenomenon, but it has evolved to have global impacts. The increase in intensity of regional and international competition, ineffectiveness of regional development policies and models has led to the focus on regional economic development. In particular, a focus on industrial cluster promotion, both in developed and developing countries has proliferated owing to their increased success as a sustainable source of economic growth and development. Industrial clusters are a geographically proximate group of inter-connected companies and associated institutions in a particular field, linked by commonalities and complementarities. In addition to industrial cluster formation, firms can also maintain competitiveness through internationalisation. Internationalisation ensures that firms are able to serve many markets from existing manufacturing bases without having to establish production plants in other markets. It reduces the over dependence on domestic markets and business risks associated with dependence on one market. This study identified industrial clusters for the North West Province (NWP) of South Africa using the Structural Path Analysis (SPA) method, as a strategy to enhance firm competitiveness. It contributes to the methods to identify industrial clusters by applying the Power of Pull (PoP) method to prioritise the number of clusters for the NWP. The ten identified industrial clusters and their respective PoP rankings were (i) communication; (ii) real estate; (iii) grain mill, bakery and animal feed products; (iv) building and other construction; (v) basic metal products; (vi) other food products; (vii) agriculture; (viii) non-metallic mineral products; (ix) trade; and (x) dairy products. This study identified the most important centres, in terms of the most contributions to output, employment and profit at the local municipal level across all the ten identified clusters. These centres were Madibeng, Rustenburg, City of Matlosana, Mafikeng and Ditsobotla. This indicates that efforts to stimulate cluster formation in this sector should be focused in these regions. This study also determined whether any association exists between the identified industrial clusters‟ products and services and the realistic export opportunities according to the DSM for products and the DSM for services. Four of the six product clusters were found to have REOs according to the DSM for products, namely grain mill, bakery and animal feeds products, agriculture, non-metallic mineral products and the basic metal products clusters. In terms of services, only two service clusters, namely communication and building and other construction services clusters, were found to have with REOs according to the DSM for services. This study further demonstrated the effects of industrial cluster formation on the regional economy, using social accounting matrix (SAM) multipliers. SAM multiplier analysis was used to demonstrate the output, employment, employment income and gross domestic product (GDP) supported by cluster formation for the NWP. The supported activity for the agriculture and trade clusters was less than the actual activity. The following clusters‟ supported activity was greater than the actual activity; communication; real estate; grain mill, bakery and animal feed products; building and other construction; basic metal products; other food products; non-metallic mineral products; and dairy products. The identified industrial clusters‟ REOs were explored further to provide more details on the products or services identified as having REOs. In addition, the countries to which the identified REOs (products and services) can be exported were discussed. In terms of product clusters identified to have REOs, the export potential values, cell classifications and market accessibility index scores were discussed. In terms of the service clusters identified as having REOs, countries, market access, market openness, import demand and cell classifications were discussed. / PhD (International Trade), North-West University, Potchefstroom Campus, 2014