scholarly journals Model-based media selection to minimize the cost of metabolic cooperation in microbial ecosystems

2016 ◽  
Vol 32 (11) ◽  
pp. 1733-1739 ◽  
Author(s):  
Mattia Zampieri ◽  
Uwe Sauer
Keyword(s):  
Media Selection ◽  
Metabolic Cooperation ◽  
Model Based ◽  
Microbial Ecosystems ◽  
The Cost

A Nonlinear Observer for Minimizing Quantization Effects in Virtual Walls

1999 ◽  
Author(s):  
Daniel R. Madill ◽  
David W. L. Wang ◽  
Mennas C. Ching
Keyword(s):  
Coulomb Friction ◽  
Force Sensor ◽  
Performance Model ◽  
Nonlinear Observer ◽  
Direct Drive ◽  
Model Based ◽  
Measured Position ◽  
Three Degree Of Freedom ◽  
The Cost ◽  
Estimator Design

Abstract Quantization effects can reduce the achievable stiffness of virtual walls. Phase delays introduced by filtering are also an issue. This paper presents a non-linear model-based observer that produces smooth position and velocity estimates with very little delay based on measured position and force signals. Compensation for Coulomb friction and motor saturation is incorporated into the estimator. Use of the estimator in the implementation of a virtual wall yielded higher wall stiffnesses and better performance. Model-based estimator design was possible due to the design of the manipulator. The three degree-of-freedom manipulator employed is direct-drive, gravity-balanced, and dynamically-decoupled with nearly linear dynamics. The robot structure itself is employed as a force sensor, reducing the cost of the device.

The cost effectiveness of influenza vaccination for adults aged 50 to 64 years: A model-based analysis for Spain

Vaccine ◽  
2007 ◽  
Vol 25 (39-40) ◽  
pp. 6900-6910 ◽  
Author(s):  
S ABALLEA ◽  
J DEJUANES ◽  
M BARBIERI ◽  
M MARTIN ◽  
J CHANCELLOR ◽  
...  
Keyword(s):  
Cost Effectiveness ◽  
Influenza Vaccination ◽  
Model Based ◽  
The Cost ◽  
Model Based Analysis

Cost and Effectiveness of Search-Based Techniques for Model-Based Testing: An Empirical Analysis

2017 ◽  
Vol 27 (04) ◽  
pp. 601-622 ◽  
Author(s):  
Aneesa Saeed ◽  
Siti Hafizah Ab Hamid ◽  
Asmiza Abdul Sani
Keyword(s):  
Test Data ◽  
Random Search ◽  
Test Cases ◽  
Optimal Test ◽  
Model Driven ◽  
Model Based ◽  
Model Based Testing ◽  
Generate Test Data ◽  
The Cost ◽  
Model Driven Approach

Model-based testing (MBT) seems to be gaining interest in industry and academia due to its provision of systematic, automated and comprehensive testing. The challenge in MBT is to generate optimal test data to execute test cases. Recently, researchers have successfully applied search-based techniques (SBTs) by automating the search for an optimal set of test data at reasonable cost compared to other more expensive techniques. In real complex systems, effectiveness and cost of SBTs for MBT in industrial context are little known. The objective of this study is to empirically evaluate the cost and the effectiveness of SBTs for MBT on industrial case studies. We applied a model-driven approach and SBTs to automatically generate executable feasible test cases. The results show that the model-driven approach generated high number of infeasible test cases with less time while genetic algorithm (GA) and simulating annealing (SA) outperformed significantly random search (RS) with high generation time. We concluded that local SBTs are more appropriate to generate test data when the type of the constraints is simple. Current work on analyzing the cost and effectiveness on SBTs for MBT indicates possible enhancement using the model-driven approach to detect the infeasible paths and SBTs to achieve optimal success rate.

Cost-effectiveness of influenza control measures: a dynamic transmission model-based analysis

2013 ◽  
Vol 141 (12) ◽  
pp. 2581-2594 ◽  
Author(s):  
S.-C. CHEN ◽  
C.-M. LIAO
Keyword(s):  
Cost Effectiveness ◽  
Natural Ventilation ◽  
Seasonal Influenza ◽  
School Setting ◽  
Control Measures ◽  
Transmission Model ◽  
Model Based ◽  
Dynamic Transmission Model ◽  
Influenza Transmission ◽  
The Cost

SUMMARYWe investigated the cost-effectiveness of different influenza control strategies in a school setting in Taiwan. A susceptible-exposure-infected-recovery (SEIR) model was used to simulate influenza transmission and we used a basic reproduction number (R0)–asymptomatic proportion (θ) control scheme to develop a cost-effectiveness model. Based on our dynamic transmission model and economic evaluation, this study indicated that the optimal cost-effective strategy for all modelling scenarios was a combination of natural ventilation and respiratory masking. The estimated costs were US$10/year per person in winter for one kindergarten student. The cost for hand washing was estimated to be US$32/year per person, which was much lower than that of isolation (US$55/year per person) and vaccination (US$86/year per person) in containing seasonal influenza. Transmission model-based, cost-effectiveness analysis can be a useful tool for providing insight into the impacts of economic factors and health benefits on certain strategies for controlling seasonal influenza.

The Relationship Between Costs And Availability Of Credit: An Empirical Study For Some Tunisian Firms

2012 ◽  
Vol 28 (3) ◽  
pp. 515
Author(s):  
Helmi Hamdi ◽  
Abdelaziz Hakimi ◽  
Mouldi Djelassi
Keyword(s):  
Data Analysis ◽  
Panel Data ◽  
Econometric Model ◽  
Panel Data Analysis ◽  
Qualitative Model ◽  
Model Based ◽  
Bank Financing ◽  
Logit Estimation ◽  
The Cost ◽  
The Relationship

<p>The aim of this paper is twofold. First, the paper aims to analyze the relationship between the number of bank enterprise relationships and the cost of credit for some Tunisian firms. Using an econometric model based on panel data analysis, results show that the number of bank financing lenders increases the cost of credit. Second, the paper aims to determine the rapport between the number of bank partners and the availability of the credit. By using a qualitative model based on the logit estimation, results show that the number of banks affects negatively and significantly the availability of credit.</p>

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