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Publicações

2014

Dashboard services for pragmatics-based interoperability in cloud and ubiquitous manufacturing

Autores
Ferreira, L; Putnik, G; Cruz Cunha, MM; Putnik, Z; Castro, H; Alves, C; Shah, V;

Publicação
Cloud Technology: Concepts, Methodologies, Tools, and Applications

Abstract
The real Cloud and Ubiquitous Manufacturing systems require effectiveness and permanent availability of resources, their capacity and scalability. One of the most important problems for applications management over cloud based platforms, which are expected to support efficient scalability and resources coordination following SaaS implementation model, is their interoperability. Even application dashboards need to easily incorporate those new applications, their interoperability still remains a big problem to override. So, the possibility to expand these dashboards with efficiently integrated communicational cloud based services (cloudlets) represents a relevant added value as well as contributes to solving the interoperability problem. Following the architecture for integration of enriched existing cloud services, as instances of manufacturing resources, this paper: a) proposes a cloud based web platform to support dashboard integrating communicational services, and b) describe an experimentation to sustain the theory that the effective and efficient interoperability, especially in dynamic environments, could be achieved only with human intervention.

2014

ON THE POSSIBILITY OF SPEAKER DISCRIMINATION USING A GLOTTAL PULSE PHASE-RELATED FEATURE

Autores
Ferreira, A;

Publicação
2014 IEEE INTERNATIONAL SYMPOSIUM ON SIGNAL PROCESSING AND INFORMATION TECHNOLOGY (ISSPIT)

Abstract
Normalized Relative Delay (NRD) is a phase-related feature that can be extracted from the harmonic structure of a periodic sound, using accurate frequency and phase estimation. We present research results showing that NRD coefficients reflect the phase structure of glottal pulses and possess a speaker discrimination capability. We use both synthetic and natural voiced vowels uttered by children, adult males and females, to illustrate both the shift-invariance property of NRDs, as well as their speaker discrimination potential, using a Fisher related criterion of data scattering.

2014

Evaluating changes in the operational planning of public transportation

Autores
Mendes Moreira, J; De Freire Sousa, J;

Publicação
Advances in Intelligent Systems and Computing

Abstract
Operational planning at public transport companies is a complex process that usually comprises several phases. In the planning phase, schedules are constructed considering that buses arrive and depart as scheduled. Obviously, several disruptions frequently occur, but their impact on the operating conditions is not easy to estimate. This difficulty arises mostly due to the impossibility of testing different solutions under the same conditions. Indeed, typically, the available data are a result of the current plan, while new proposed solutions have not produced real data yet. Along this chapter we discuss the assessment of the impact of changes in the operational planning on the real operating conditions, before their occurrence. We present a framework for such assessment, which includes two components: the impact on costs, and the impact on revenues. We believe that this framework will be useful in future works on operational planning of public transport companies. © Springer International Publishing Switzerland 2014.

2014

CRUDi Framework Application - Insurance Company Case Study

Autores
Pereira, J; Martins, J; Goncalves, R; Santos, V;

Publicação
PROCEEDINGS OF THE 2014 9TH IBERIAN CONFERENCE ON INFORMATION SYSTEMS AND TECHNOLOGIES (CISTI 2014)

Abstract
In general, managers have different opinions from those advocated by CIOs in relation to Information Systems, especially with regard to their importance and value to the business as well as in terms of investment needs. Here, we discuss and study new approaches to methods and tools for assessing the relative importance of each information system for business, focusing on the insurance companies. We applied the CRUDi Framework that introduces new key indicators for better decision support and to identify investment priorities, presenting results regarding the relative importance of each process to support the business strategy. The main contributions of this work are the CRUDi Framework Case Study of application in an insurance company, as a tool to improve alignment between business and IS strategies and the discussion of the achieved results.

2014

Regulating international gas transport: Welfare effects of postage stamp and entry-exit systems

Autores
Brandao, A; Soares, I; Sarmento, P; Resende, J; Pinho, J;

Publicação
ENERGY

Abstract
There is no consensus on the method to set transmission tariffs for natural gas. The entry-exit system is widely used in European markets because it is cost reflective, it allows the network users to separately book capacity for entry and exit points, beyond its pro-competitiveness characteristics. Some authors, however, defend the adoption of the postage stamp (where a single tariff is charged regardless of the origin of the gas), due to its simplicity. Our goal is to compare these two mechanisms of transmission tariff with respect to the impacts on welfare. We find that the welfare effects crucially depend on the size of the internal market and the fixed costs supported by the incumbent firm. If the domestic market is sufficiently large and there are imports from abroad, consumer surplus is higher under the postage stamp system.

2014

HOPS - Hamming-Oriented Partition Search production planning in the spinning industry

Autores
Camargo, VCB; Toledo, FMB; Almada Lobo, B;

Publicação
EUROPEAN JOURNAL OF OPERATIONAL RESEARCH

Abstract
In this paper, we investigate a two-stage lot-sizing and scheduling problem in a spinning industry. A new hybrid method called HOPS (Hamming-Oriented Partition Search), which is a branch-and-bound based procedure that incorporates a fix-and-optimize improvement method is proposed to solve the problem. An innovative partition choice for the fix-and-optimize is developed. The computational tests with generated instances based on real data show that HOPS is a good alternative for solving mixed integer problems with recognized partitions such as the lot-sizing and scheduling problem.

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