Revisiting the issue of the credibility of simulation studies in telecommunication networks: highlighting the results of a comprehensive survey of IEEE publications

2014 ◽  
Vol 52 (5) ◽  
pp. 218-224 ◽  
Author(s):  
Nurul I. Sarkar ◽  
Jairo A. Gutierrez
Keyword(s):  
Telecommunication Networks ◽  
Simulation Studies ◽  
Comprehensive Survey

scholarly journals A Comprehensive Study on LPWANs With a Focus on the Potential of LoRa/LoRaWAN Systems

2021 ◽  
Author(s):  
Christos Milarokostas ◽  
Dimitris Tsolkas ◽  
Nikos Passas ◽  
Lazaros Merakos
Keyword(s):  
Wide Area Networks ◽  
Simulation Studies ◽  
Data Generation ◽  
Cloud Infrastructure ◽  
Main Research ◽  
Server Side ◽  
Digital Twins ◽  
Comprehensive Survey ◽  
Shed Light ◽  
Comprehensive Study

This publication offers a comprehensive survey on the topic of Low-Power Wide Area Networks (LPWANs). We discuss the scope of LPWAN connectivity and present numerous well-established technologies that can offer such a service. From this presentation, LoRa/LoRaWAN systems emerge as one of the dominant solutions, and hence we offer details about end-to-end LoRa/LoRaWAN-enabled networking. As an area being in its infancy, LPWANs in general and LoRa/LoRaWAN in specific undergo extensive research. We shed light in key contributions, whereas we also provide our findings regarding the main research focus and needs. Simulation studies appear to be a popular choice among researchers, whereas real system implementations are constantly emerging thanks to low deployment and operational cost. For the former, we offer a comparative overview of existing simulators, whereas for the latter we discuss key considerations about the server-side part of a deployed system, which is usually supported by cloud infrastructure. Finally, LPWANs are systems that experience intense data generation, and thus we deliver a presentation of data-related operations which take place in such systems. This presentation revealed a major vertical market that is expected to be served by LPWANs: the Industiral IoT; which embodies concepts like Asset Administration Shell and Digital Twins.

scholarly journals Generation of self-similar processes for simulation studies of telecommunication networks

2003 ◽  
Vol 38 (11-13) ◽  
pp. 1249-1257 ◽  
Author(s):  
Hae-Duck J. Jeong ◽  
K. Pawlikowski ◽  
D.C. McNickle
Keyword(s):  
Telecommunication Networks ◽  
Simulation Studies ◽  
Self Similar

scholarly journals A Comprehensive Study on LPWANs With a Focus on the Potential of LoRa/LoRaWAN Systems

2021 ◽  
Author(s):  
Christos Milarokostas ◽  
Dimitris Tsolkas ◽  
Nikos Passas ◽  
Lazaros Merakos
Keyword(s):  
Wide Area Networks ◽  
Simulation Studies ◽  
Data Generation ◽  
Cloud Infrastructure ◽  
Main Research ◽  
Server Side ◽  
Digital Twins ◽  
Comprehensive Survey ◽  
Shed Light ◽  
Comprehensive Study

This publication offers a comprehensive survey on the topic of Low-Power Wide Area Networks (LPWANs). We discuss the scope of LPWAN connectivity and present numerous well-established technologies that can offer such a service. From this presentation, LoRa/LoRaWAN systems emerge as one of the dominant solutions, and hence we offer details about end-to-end LoRa/LoRaWAN-enabled networking. As an area being in its infancy, LPWANs in general and LoRa/LoRaWAN in specific undergo extensive research. We shed light in key contributions, whereas we also provide our findings regarding the main research focus and needs. Simulation studies appear to be a popular choice among researchers, whereas real system implementations are constantly emerging thanks to low deployment and operational cost. For the former, we offer a comparative overview of existing simulators, whereas for the latter we discuss key considerations about the server-side part of a deployed system, which is usually supported by cloud infrastructure. Finally, LPWANs are systems that experience intense data generation, and thus we deliver a presentation of data-related operations which take place in such systems. This presentation revealed a major vertical market that is expected to be served by LPWANs: the Industiral IoT; which embodies concepts like Asset Administration Shell and Digital Twins.

scholarly journals On credibility of simulation studies of telecommunication networks

2002 ◽  
Vol 40 (1) ◽  
pp. 132-139 ◽  
Author(s):  
K. Pawlikowski ◽  
H.-D.J. Jeong ◽  
J.-S.R. Lee
Keyword(s):  
Telecommunication Networks ◽  
Simulation Studies

Benefits from Computerized Adaptive Testing as Seen in Simulation Studies

1999 ◽  
Vol 15 (2) ◽  
pp. 91-98 ◽  
Author(s):  
Lutz F. Hornke
Keyword(s):  
Measurement Error ◽  
Computerized Adaptive Testing ◽  
Test Procedure ◽  
Adaptive Testing ◽  
Parameter Estimates ◽  
Simulation Studies ◽  
Computerized Adaptive Test ◽  
Item Banks ◽  
Item Parameters ◽  
General Reliability

Summary: Item parameters for several hundreds of items were estimated based on empirical data from several thousands of subjects. The logistic one-parameter (1PL) and two-parameter (2PL) model estimates were evaluated. However, model fit showed that only a subset of items complied sufficiently, so that the remaining ones were assembled in well-fitting item banks. In several simulation studies 5000 simulated responses were generated in accordance with a computerized adaptive test procedure along with person parameters. A general reliability of .80 or a standard error of measurement of .44 was used as a stopping rule to end CAT testing. We also recorded how often each item was used by all simulees. Person-parameter estimates based on CAT correlated higher than .90 with true values simulated. For all 1PL fitting item banks most simulees used more than 20 items but less than 30 items to reach the pre-set level of measurement error. However, testing based on item banks that complied to the 2PL revealed that, on average, only 10 items were sufficient to end testing at the same measurement error level. Both clearly demonstrate the precision and economy of computerized adaptive testing. Empirical evaluations from everyday uses will show whether these trends will hold up in practice. If so, CAT will become possible and reasonable with some 150 well-calibrated 2PL items.

Adaptive Control Scheme for Coupled Tank Process

2018 ◽  
pp. 89-95
Author(s):  
Vinodhini M.
Keyword(s):  
Adaptive Control ◽  
Nonlinear Behaviour ◽  
Simulation Studies ◽  
Input Output ◽  
Control Scheme ◽  
Direct Model ◽  
Multivariable Process ◽  
Model Reference Adaptive ◽  
Siso System ◽  
Adaptive Control Scheme

The objective of this paper is to develop a Direct Model Reference Adaptive Control (DMRAC) algorithm for a MIMO process by extending the MIT rule adopted for a SISO system. The controller thus developed is implemented on Laboratory interacting coupled tank process through simulation. This can be regarded as the relevant process control in petrol and chemical industries. These industries involve controlling the liquid level and the flow rate in the presence of nonlinearity and disturbance which justifies the use of adaptive techniques such as DMRAC control scheme. For this purpose, mathematical models are obtained for each of the input-output combinations using white box approach and the respective controllers are developed. A detailed analysis on the performance of the chosen process with these controllers is carried out. Simulation studies reveal the effectiveness of proposed controller for multivariable process that exhibits nonlinear behaviour.

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