THE STRUCTURE OF A MODEL / 305 CLASSIFICATIONS OF MODELS / 306 COMMON MODELING TECHNIQUES I 307 Flow (harts / 307 Graph or Network Models / 309 PERT Planning Method / 312 Linear Programming Models / 313 Queueing Models / 314 Arrival Process / 314 Queue Structure / 315 Service System / 315 Measures of Performance / 315 Simulation Models / 316 Case Study 1 : Emergency Service Simulation Model / 3...

Diversas ferramentas do gerenciamento de projetos podem ser aplicadas nos serviços da indústria petróleo e gás. A ferramenta PERT, também conhecida como estimativa três pontos, utiliza-se informação especialistas para calcular a duração das atividades cronograma projeto, levando em consideração cenários otimistas, mais prováveis pessimistas, todos relacionados às incertezas riscos projeto. Simu...

We develop a multi-objective model for resource allocation problem in PERT networks with exponentially or Erlang distributed activity durations, where the mean duration of each activity is a non-increasing function and the direct cost of each activity is a non-decreasing function of the amount of resource allocated to it. The decision variables of the model are the allocated resource quantities...

Conclusions  A model for building statistical dependence between marginal distribution with bounded support is discussed. The model is geared towards elicitation of dependence parameters through expert judgment. The resulting joint distribution may be useful in uncertainty analyses where dependence between random variables with a bounded support is present due to common risk factors, such as e...

We evaluate in perturbative QCD, up to order αs , the mass of the Bc. We use the so-called 1S-mass in order to improve the convergence of the perturbative series. Our result is E(Bc)pert = 6323 +3 +7 −1−6 MeV. Non-perturbative effects are discussed. An estimate in terms of local condensates and a comparison with potential models seem to be consistent with non-perturbative contributions of the o...

Images represent an important and abundant source of data. Understanding their statistical structure has important applications such as image compression and restoration. In this paper we propose a particular kind of probabilistic model, dubbed the “products of edge-perts model” to describe the structure of wavelet transformed images. We develop a practical denoising algorithm based on a single...

Received September 15, 1997; revised May 14, 1998; accepted August 20, 1998. Communicated by Jieh Hsiang. 1 A CPM/PERT can be either an AOV or an equivalent AOA (Activity On Arc) network. Here, AOV is adapted for comparison with SPREM. 2 Here, deterministic means that when a process on vertex V is complete, then all of V’s successors will enact the process individually. JOURNAL OF INFORMATION S...

In this paper we present a powerful technique for analysing production networks in the presence of decision-making variables and cost exibility. Processes are modelled as a network , similar to PERT/CPM schemes, but with built-in decision and cost variables. For minimal increased complexity in the development of the network, we show that powerful analysis and optimisation techniques are enabled...