the aim of a multi-mode resource-constrained project scheduling problem (mrcpsp) is to assign resource(s) with the restricted capacity to an execution mode of activities by considering relationship constraints, to achieve pre-determined objective(s). these goals vary with managers or decision makers of any organization who should determine suitable objective(s) considering organization strategi...

Large sports centers are characterized by special energy demand profiles compared to other facilities. The aim of this work is assess the economic investment photovoltaics (PVs) on a sport center microgrid using different charging methods and efficiently exploiting PV generation. overall performed in following three steps. first step requirement analysis, second focuses PEV strategy proposition...

Bengkel Permesinan dan Las “ Sumber Rejeki ” merupakan salah satu bengkel di Kota Pekalongan yang bergerak dibidang permesinan pengelasan, produk dihasilkan seperti pagar rumah, kanopi, jendela, pintu sebagainya. Pembuatan pada usaha ini sudah menggunakan mesin-mesin perkakas diantaranya mesin gerinda, potong, bor, inverter las. Masa produktif dari tersebut kurang lebih sekitar 5 tahun. Penelit...

This article seeks to develop a richer understanding of the suitability of IP telephony in the Public Switched Telephony Network (PSTN) with an actual local exchange carrier (LEC)’s case and network simulation. We also performed a simple real options analysis to evaluate a telecommunications network. The underlying network and associated data were derived from our studies of an actual LEC. The ...

Smart field technology is an attractive research field, as it can find an optimal well control strategy to maximize the oil recovery or the net present value (NPV). As the subsurface geology is highly uncertain, the reservoir model is usually described by a set of reservoir models. In well control optimization for a reservoir described by a set of geological models, the expectation of NPV is op...

one of the mostly used enhanced oil recovery methods is the injection of water or gas under pressure to maintain or reverse the declining pressure in a reservoir. several parameters should be optimized in a fluid injection process. the usual optimizing methods evaluate several scenarios to find the best solution. since it is required to run the reservoir simulator hundreds of times, the process...

Production strategy from a hydrocarbon reservoir plays an important role in optimal field development in the sense of maximizing oil recovery and economic profits. To this end, self-adapting optimization algorithms are necessary due to the great number of variables and the excessive time required for exhaustive simulation runs. Thus, this paper utilizes genetic algorithm (GA), and the objective...

Production scheduling in underground mines is still a manual process, and achieving a truly optimal result through manual scheduling is impossible due to the complexity of the scheduling problems. Among the underground mining methods, sub-level caving is a common mining method with a high production rate for hard rock mining. There are limited studies about long-term production scheduling...

Projects in the mining industry are undertaken with the objective of maximizing economic value, which is near-universally measured by the Net Present Value (NPV), considering all capital expenditure and operating cash flow. This industry is usually considered high risk because of historically volatile commodity prices (directly impacting revenues) and the fact that very large capital expenditur...