Relacionamento e coordenação da cadeia produtiva da mandioca no Noroeste do Paraná

The production of starch and cassava starch (Manihot esculenta) if has shown to an important business for the region the northwest of the Paraná, generating income and job for a significant agricultural producers. The production of the region is processed for industries at private capital and cooperatives of producers. The study involving agricultural producers and one of the most important cooperatives of the region (C-Vale) objectified to evaluate the relationships between cooperative and producers, and the mechanisms of coordination of the productive chain. The results had disclosed that the relationships are not harmonious, generating opportunism situations, high costs of transaction and diffidence in the operations between producers and cooperative. Also if it perceived a difficulty of coordination of the productive chain, due to lack of integration between the partners, what it affects the competitiveness and the efficiency of the sector.

Análise comparativa de redes interfirmas de instituições de ensino superior

Organizations have been facing several challenges to survive in a world in constant transformation. In light of that, new management models need to be incorporated to the organizational dynamics in order to achieve competitive advantages. The inter-firm networks establish a particular form means of cooperation as a fundamental element, as there can be ties of diverse nature to justify the relationships. These are interorganizations or inter-firms, formed by people who maintain the relationships to improve the overall performance of the network and of the participants. Thus, the Education Institutions, considered as organizations, which have the objective to disseminate knowledge and form professionals who contribute to the growth of a nation, also make use of this type of arrangement. Considering the raised questions, this article aims to demonstrate the applicability of a business network mapping technique at Higher Education Institutions. It also presents the possibility to perform the comparative analysis of the intensity of the relationship observed in a private and in a public institution, in the State of São Paulo. By applying the comparative analysis, this study also presents the relationship among the people involved at strategic and tactical levels of each institution, taking into account each one s peculiarities.

Avaliação da competitividade e da inserção em redes sociais dos piscicultores da UHE Canoas I

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Avaliação da competitividade e da inserção em redes sociais dos piscicultores da uhe canoas I

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Avaliação da competitividade e da inserção em redes sociais dos piscicultores da UHE Canoas I

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

A social network approach to trust management in VANETs

In the past few years, vehicular ad hoc networks(VANETs) was studied extensively by researchers. VANETs is a type of P2P network, though it has some distinct characters (fast moving, short lived connection etc.). In this paper, we present several limitations of current trust management schemes in VANETs and propose ways to counter them. We first review several trust management techniques in VANETs and argue that the ephemeral nature of VANETs render them useless in practical situations. We identify that the problem of information cascading and oversampling, which commonly arise in social networks, also adversely affects trust management schemes in VANETs. To the best of our knowledge, we are the first to introduce information cascading and oversampling to VANETs. We show that simple voting for decision making leads to oversampling and gives incorrect results in VANETs. To overcome this problem, we propose a novel voting scheme. In our scheme, each vehicle has different voting weight according to its distance from the event. The vehicle which is more closer to the event possesses higher weight. Simulations show that our proposed algorithm performs better than simple voting, increasing the correctness of voting. © 2012 Springer Science + Business Media, LLC.

An emergy-based evaluation of a reverse logistics network for steel recycling

Efficient implementation of recycling networks requires appropriate logistical structures for managing the reverse flow of materials from users to producers. The steel sheet distributor studied had established a protocol for scrap recovery with the steel plant and its customers. The company invested in producing containers, hiring a specialized labor force and in purchasing trucks for container transportation to implement the logistics network for recycling. That network interconnected the company with two kinds of customers: the ones returning scrap and the ones who preferred to continue business-as-usual. The logistical network was analyzed using emergy synthesis, and the data obtained were used to evaluate and compare the system's environmental costs and benefits from the perspective of the distributor and the steel plant operator. The use of emergy ternary diagrams provided a way to assess recycle strategies to compare the relative economic and environmental benefits of the logistical network implemented. The minimum quantity of scrap that the distributor must recover to improve environmental benefits was determined allowing decision on whether it is worth keeping the system running. The new assessment method proposed also may help policy-makers to create strategies to reward or incentive users of reverse logistics, and help to establish regulations, by decreasing taxes or stimulating innovation, for effectively implement the National Policy on Solid Waste. (C) 2013 Elsevier Ltd. All rights reserved.