Knowledge Flow Modeling and Analysis in Supply Chain Based on Stochastic Petri Net

2012 ◽  
Vol 459 ◽  
pp. 381-385 ◽  
Author(s):  
Xiao Zhong Li ◽  
Yi Jie Ding
Keyword(s):  
Supply Chain ◽  
Time Delay ◽  
Petri Net ◽  
Flow Model ◽  
Knowledge Flow ◽  
Flow Modeling ◽  
Competitive Strategies ◽  
Problem Of Time ◽  
Modeling And Analysis ◽  
Stochastic Petri Net

Knowledge is an important resource providing competitive strategies for the firms. Managing knowledge through supply chain will bring more benefits to the businesses. Various factors during the process of knowledge flowing can cause different time delay. In order to analyze the problem of time delay of knowledge flow in supply chain, the knowledge flow model in supply chain based on stochastic Petri net is proposed and corresponding isomorphic Markov chain is given. The time performance and the efficiency of knowledge flow Petri net model are discussed. The proposed method can help the firm with the knowledge flow management and reorganization

GEOPOLIS software tools – Groundwater flow modeling at deep repository of liquid radioactive waste at Severny test site

2021 ◽  
pp. 91-97
Author(s):  
V. V. Suskin ◽  
A. V. Rastorguev ◽  
I. V. Kapyrin
Keyword(s):  
Groundwater Flow ◽  
Flow Model ◽  
Liquid Radioactive Waste ◽  
Three Dimensional ◽  
Test Site ◽  
Geological Structure ◽  
Groundwater Flow Model ◽  
Flow Modeling ◽  
Three Dimensional Model ◽  
Groundwater Flow Modeling

This article discusses a three-dimensional groundwater flow model of a deep disposal facility at Severny test site. The three-dimensional model is a part of the certified software GEOPOLIS, based on the hydrogeological code GeRa (Geomigration of Radionuclides) serving as the calculation engine. This study describes the hydrogeological patterning of the groundwater flow model, as well as the results of calibration and verification of the model water heads with respect to the data of monitoring for more than 40 years of the deep repository exploitation. The article begins with a brief overview of the previously developed hydrogeological models of this object and continues with a description of the geological structure of the territory, and with a substantiation of the boundaries and parameters of the model. The results of groundwater flow modeling, model calibration, verification and estimation of discrepancy between the model results and monitoring data are shown. The comparison of the modeled and observed water heads in the stationary conditions (before the start of injection) and during operation of the deep repository allows making conclusion on the quality of calibration.

Use of a groundwater flow model to explain strong upward gradients in rock formation underneath the Mercier site

1992 ◽  
Vol 29 (4) ◽  
pp. 696-701
Author(s):  
Denis Isabel ◽  
Pierre Gélinas ◽  
Jacques Locat
Keyword(s):  
Finite Elements ◽  
Groundwater Flow ◽  
Flow Model ◽  
Environmental Problem ◽  
Complex Model ◽  
Groundwater Flow Model ◽  
Flow Modeling ◽  
Hydrogeological Setting ◽  
Modeling Strategy ◽  
Bedrock Aquifer

The groundwater pollution case at Mercier is a very complex one. Groundwater flow modeling has been a valuable tool in the assessment of this large environmental problem. However, due to the complexity of the hydrogeological setting, the modeling has been performed with various simple case models in lieu of a large complex model. Here we report the results of one of these piecewise modeling tasks that proved very useful in the explanation of the strong upward gradients observed in the bedrock aquifer. These results and their interpretation prove the usefulness of the piecewise modeling strategy in this case. Key words : ground water modeling, finite elements.

Multiphase flow modeling of gas hydrates with a simple hydrodynamic slug flow model

2013 ◽  
Vol 99 ◽  
pp. 298-304 ◽  
Author(s):  
Luis E. Zerpa ◽  
Ishan Rao ◽  
Zachary M. Aman ◽  
Thomas J. Danielson ◽  
Carolyn A. Koh ◽  
...  
Keyword(s):  
Multiphase Flow ◽  
Gas Hydrates ◽  
Slug Flow ◽  
Flow Model ◽  
Flow Modeling

Fluid Flow Modeling and Simulation for the Coaxial Cable of the LEASAT Antenna System

1992 ◽  
Vol 114 (3) ◽  
pp. 358-360
Author(s):  
Hsien-Yang Yeh ◽  
Hen-Geul Yeh
Keyword(s):  
Fluid Flow ◽  
Pressure Profile ◽  
Antenna System ◽  
Gas Pressure ◽  
Coaxial Cable ◽  
Flow Modeling ◽  
Modeling And Analysis ◽  
Modeling Analysis ◽  
Analysis Computer ◽  
Fluid Flow Modeling

A preliminary fluid flow modeling, analysis, and simulation of the gas pressure profile within a 259 cm long coaxial cable is presented. This coaxial cable is part of the antenna system of the LEASAT satellite. To eliminate the possibility of any corona or arcing phenomenon inside the coaxial cable during operation of the satellite, it is necessary to not only prove experimentally but also show analytically that the gas pressure inside the cable drops down and stays below 0.01 Ton within 24 hours after the satellite enters into its orbit. In this paper, only the analytical work is discussed. The continuum fluid mechanics and the kinetic theory of gases are applied for modeling and analysis. Computer simulation is done by using an IBM XT and the results are presented.

Single and two-phase flow modeling and analysis of a coaxial vacuum tube solar collector

Solar Energy ◽  
2012 ◽  
Vol 86 (1) ◽  
pp. 175-189 ◽  
Author(s):  
Abdul Waheed Badar ◽  
Reiner Buchholz ◽  
Felix Ziegler
Keyword(s):  
Solar Collector ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Flow Modeling ◽  
Two Phase ◽  
Vacuum Tube ◽  
Modeling And Analysis

Modeling DCS of Nuclear Power Plant With Extended GO-FLOW Methodology

2017 ◽  
Author(s):  
Lu Hongxing ◽  
Yang Ming ◽  
Dai Xinyu ◽  
Li Wei ◽  
Yoshikawa Hidekazu
Keyword(s):  
Control System ◽  
Flow Model ◽  
Modeling Method ◽  
System Structure ◽  
Control Action ◽  
Volume Control ◽  
Flow Modeling ◽  
Control Logic ◽  
And Control ◽  
The Relationship

GO-FLOW model is a success-oriented system modeling method which describes how the system configures its resources to achieve required functions by using basic functional units in terms of substances and demand flows in the system. The GO-FLOW models, which are directly built according to system structure drawings, can be used to analyze the reliability of a system with time and phased mission problems. With the development of Digital Control System (DCS), the reliability analysis of whole DCS has become an important task. However, there are some shortcomings using the traditional GO-FLOW methodology to model DCS: 1. There are not abundant operators in the GO-FLOW model to describe the control logic in DCS; 2. It is hard to model the relationship between the control actions and hardware devices using traditional GO-FLOW methodology; This paper presents an extended GO-FLOW modeling method. In this study, the GO-FLOW model is supplemented and improved, which can accurately describe the relationship and control logic between the hardware and control action (or human control action) in the running process of the DCS. In this paper, taking the Chemical and Volume Control System (CVCS) as an example, using the extended GO-FLOW modeling method established the model of CVCS, and the model of DCS control logic. This improved modeling method can be applied to the reliability modeling and evaluation of DCS.

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