The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Heterogeneous systems composed of CPUs and accelerators sharing communication channels of different performance are getting mainstream in HPC but, at the same time, they show a complexity that makes it difficult to optimize the deployment of a data parallel application. Recent analytical tools such as Functional Performance Models, combined with advanced partitioning algorithms, manage to achieve...
The use of cognitive maps in support of solving practical problems of analysis of ill-structured situations and large-scale systems in economics, medicine, ecology, education and military-political sphere is growing. The problem of visual perception and understanding of cognitive maps is proven to be extremely urgent and practically important. The set of visualization methods that provide better perception...
The Spring Loaded Inverted Pendulum (SLIP) model has been extensively investigated and used as an inspiration to the study of legged locomotion. Biological data suggest that legs regulate energy production and removal via adjusting muscle stiffness, therefore the classical SLIP is energetically conservative model, and cannot fully explain the robustness and flexibility of many legged animals during...
This paper analyzes the structural properties (defined by traps and siphons) of biological system called Endoplasmic Reticulum Exit Site (ER-ES) by using Petri nets to define liveness of the system. The Snoopy tool has been used to model ER-ES in terms of Petri nets which confirms liveness of the system guarantying absence of the deadlocks by visual display of traps and siphons. As Petri nets have...
Residential solar Photovoltaic (PV) installations are increasing at a very high pace in the United States. In 2017 there are approximately one million residential solar PV installations in the US. A significant share of these installations are downstream of distribution transformers and thus connected to the secondary. To precisely analyze voltage variations induced by PV systems into distribution...
The energy turnaround in Europe's and especially Germany's energy system raises various questions concerning the European energy market as well as the electrical power grids in Germany and all over Europe. An enabler to cope with these questions is the possibility to simulate the respective structure of market mechanisms and electrical power transmission. Because of the complexity of both systems...
The occurrence of wide-area cascading events suggests that the power system is operating at reduced safety margins. The generation dispatches provided by current energy markets may influence the risk of cascading outages. This paper aims at estimating the risk of cascading outages associated with diverse dispatch solutions by integrating market-based power dispatch models and a cascading failure analysis...
This paper proposes a methodology for modeling mothballing decisions in order to better study the different strategies adopted by power plants owners and their impact on power systems (in particular generation adequacy). A system dynamic approach is adopted to build a model which represents investment, mothballing and shutdown decisions in an energy-only market. The results obtained with the proposed...
The electrification of relatively large groups of households in distant areas is often dominated by uncertainties that affect the accuracy of the network designs. Distribution network designers and planners should design and plan cost effective networks amid these uncertainties. The consumption of energy in distribution networks varies due to factors such as demographic variations, economic factors,...
We introduce a novel dynamic model for discrete time-series data, in which the temporal sampling may be nonuniform. The model is specified by constructing a hierarchy of Poisson factor analysis blocks, one for the transitions between latent states and the other for the emissions between latent states and observations. Latent variables are binary and linked to Poisson factor analysis via Bernoulli-Poisson...
This paper aims to ascertain the optimal number of consultation rooms to operate so that patients with high severity medical conditions are attended to promptly, yet with capacity to spare for low severity patients but without fully providing for this latter group to be seen within a very short duration of time upon arrival. The research methodology is based on the concepts from simulation-based lean...
In recent years, the capacity of installed distributed energy resources (DERs) using renewable energy such as photovoltaic systems (PVs) has been increasing. In the near future, battery energy storage systems (BESs) may also be installed. Then, smart communities using DERs and BESs are expected to realize the efficient use of energy in demand area. However, if the smart communities are operated to...
We present in this paper a method and tool for the verification of causal and temporal properties of embedded systems, by analyzing the trace streams resulting from virtual prototypes that combines simulated hardware and embedded software. The proposed method makes it possible to analyze different kinds of properties without rebuilding the simulation models. Logical clocks are used to identify relevant...
Xiangtan Stream basin, a typical hilly country in the Sichuan Basin, is adversely affected by overuse of chemical fertilizer on the slope farmland and pig manure produced by intensive pig breeding farm located in the upper watershed. The nitrogen and phosphorus compounds in the runoff, sediment and manure contaminate the soil and water bodies. SWAT (Soil Water and Assessment Tool) was applied to characterize...
An effective knowledge representation has always proved its importance for mankind intelligence. Among various kinds of knowledge, declarative knowledge has a vital role in medical domain and is critical for health-care safety and quality. A large volume of declarative knowledge is hidden in multiple knowledge resources such as clinical notes, standard guidelines etc. that can play an important role...
Due to the high variability of energy consumption over time and the impossibility of its long-term storage, an important issue is the selection of appropriate precise tools for forecasting. The article describes the dynamic modelling and the results of predictive dynamic models developed for a group of individual customers. The results were evaluated on the basis of real data about consumption of...
Transmission Expansion Planning (TEP) is an optimization problem that has a non-convex and combinatorial search space so that several solution algorithms may converge to local optima. Therefore, many works have been proposed to solve the TEP problem considering its relaxation or reducing its search space. In any case, relaxation and reduction approaches should not compromise the quality of the final...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.