What are the Problem Makers: Discovering the Most Frequently Changed Activities in Adaptive Processes

Recently, a new generation of adaptive Process-Aware Information System (PAIS) has emerged, which enables dynamic service changes (i.e., changes of instances derived from a composite service and process respectively). This, in turn, results in a large number of process variants derived from the same process model, but differing in their structure due to the applied changes. Since such process variants are expensive to maintain, the process model should evolve accordingly. It is therefore our goal to discover those activities that have been more often involved in process (instance) adaptations than others, such that we can focus on them when re-designing the process model. This paper provides two approaches to rank activities based on their involvement in process adaptations and process configurations respectively. The first approach allows to precisely rank the activities, but it is very expensive to perform since the algorithm is at $\mathcal{NP}$ level. We therefore provide as alternative approach an approximation ranking algorithm which computes in polynomial time. The performance of the approximation algorithm is evaluated and compared through a comprehensive simulation of 3600 process models. By applying statistical significance tests, we can also identify several factors which influence the performance of the approximation ranking algorithm

Reflector antennas with low sidelobes, low cross polarization, and high aperture efficiency

Techniques are presented for computing the horn near field patterns on the subreflectors and for correcting the phase center errors of the horn pattern by shaping the subreflector surface. The diffraction pattern computations for scanned beams are described. The effects of dish aperture diffraction on pattern bandwidth are investigated. A model antenna consisting of a reflector, shaped subreflector, and corrugated feed horn is described

Sistemas de producción de patata y otras hortalizas: procesos de producción, organización y consumo de productos ecológicos en Andalucía/España.

bitstream/item/43963/1/documento-329.pd

The Transformational Leadership Program (TLP): An Evaluation of Impact in a Capacity-Building Leadership Program for Africa's Social Sector (Abridged Version)

The role of leadership in rapidly developing African countries is fundamentally important and the need for leadership development across the African continent is critical for social and economic progress. Since 1953, the Africa-America Institute (AAI) has advocated for educational and human capacity building on the African continent by offering a wide range of scholarship, training and exchange programs that have benefited over 23,000 people from 54 African countries. In 2007, AAI launched its Transformational Leadership Program (TLP) with a grant from The Coca-Cola Africa Foundation (TCCAF) to offer business training and broader leadership development for managers of African NGOs and small to medium-sized enterprises (SMEs). The program has reached 351 participants from 14 countries through certificate and degree programs at United States International University (USIU) in Nairobi, Kenya; Pan-African University (EDC) in Lagos, Nigeria; and University of Stellenbosch (USB) in Cape Town, South Africa.In 2013, an evaluation of the TLP was conducted using surveys, questionnaires, individual interviews and focus groups with strategically selected stakeholder groups, site visits, participant reflective writing, Town Hall meetings, and a comprehensive review of program and university documents

Measurement of Electric Conductivity of Hot Gas in a SF6-circuit Breaker Interrupting Fault Currents

The realization of a new measurement method to determine electric conductivity of hot SF6-gas during interruption fault currents in an original self-blast circuit breaker is presented. The method is based on evaluation of phase shift between sinusoidal kHz-high voltage and current, applied on a sensor. This needs a kHz-resonance voltage generator and adapted sensors as a part of an electromagnetic shielded measurement system to determine time dependent electric conductivity with high resolution

Análise da rentabilidade dos sistemas empresarial e familiar de produção de pêssego no sul do Rio Grande do Sul.

bitstream/item/31658/1/documento-86.pd