scholarly journals A Note on a Modified Cournot-Puu Duopoly

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Jose S. Cánovas
Keyword(s):  
Lower Bounds ◽  
Modified Model ◽  
New Model ◽  
Dynamical Complexity ◽  
Duopoly Model

The aim of this paper is to analyze a classical duopoly model introduced by Puu in 1991 when lower bounds for productions are added to the model. In particular, we prove that the complexity of the modified model is smaller than or equal to the complexity of the seminal one by comparing their topological entropies. We also discuss whether the dynamical complexity of the new model is physically observable.

scholarly journals Modification and Validation of the Phosphate Removal Model: A Multicenter Study

2021 ◽  
pp. 1-10
Author(s):  
Weichen Zhang ◽  
Qiuna Du ◽  
Jing Xiao ◽  
Zhaori Bi ◽  
Chen Yu ◽  
...  
Keyword(s):  
Polynomial Regression ◽  
External Validation ◽  
Original Model ◽  
Phosphate Concentration ◽  
Phosphate Removal ◽  
Internal Validation ◽  
Modified Model ◽  
New Model ◽  
Significant Difference ◽  
Removal Model

<b><i>Background:</i></b> Our research group has previously reported a noninvasive model that estimates phosphate removal within a 4-h hemodialysis (HD) treatment. The aim of this study was to modify the original model and validate the accuracy of the new model of phosphate removal for HD and hemodiafiltration (HDF) treatment. <b><i>Methods:</i></b> A total of 109 HD patients from 3 HD centers were enrolled. The actual phosphate removal amount was calculated using the area under the dialysate phosphate concentration time curve. Model modification was executed using second-order multivariable polynomial regression analysis to obtain a new parameter for dialyzer phosphate clearance. Bias, precision, and accuracy were measured in the internal and external validation to determine the performance of the modified model. <b><i>Results:</i></b> Mean age of the enrolled patients was 63 ± 12 years, and 67 (61.5%) were male. Phosphate removal was 19.06 ± 8.12 mmol and 17.38 ± 6.75 mmol in 4-h HD and HDF treatments, respectively, with no significant difference. The modified phosphate removal model was expressed as Tpo<sub>4</sub> = 80.3 × <i>C</i><sub>45</sub> − 0.024 × age + 0.07 × weight + β × clearance − 8.14 (β = 6.231 × 10<sup>−3</sup> × clearance − 1.886 × 10<sup>−5</sup> × clearance<sup>2</sup> – 0.467), where <i>C</i><sub>45</sub> was the phosphate concentration in the spent dialysate measured at the 45th minute of HD and clearance was the phosphate clearance of the dialyzer. Internal validation indicated that the new model was superior to the original model with a significantly smaller bias and higher accuracy. External validation showed that <i>R</i><sup>2</sup>, bias, and accuracy were not significantly different than those of internal validation. <b><i>Conclusions:</i></b> A new model was generated to quantify phosphate removal by 4-h HD and HDF with a dialyzer surface area of 1.3–1.8 m<sup>2</sup>. This modified model would contribute to the evaluation of phosphate balance and individualized therapy of hyperphosphatemia.

scholarly journals Topological Entropy of Cournot-Puu Duopoly

2010 ◽  
Vol 2010 ◽  
pp. 1-12 ◽  
Author(s):  
Jose S. Cánovas ◽  
David López Medina
Keyword(s):  
Topological Entropy ◽  
Positive Entropy ◽  
Dynamical Complexity ◽  
Duopoly Model ◽  
Parameter Values

The aim of this paper is to analyze a classical duopoly model introduced by Tönu Puu in 1991. For that, we compute the topological entropy of the model and characterize those parameter values with positive entropy. Although topological entropy is a measure of the dynamical complexity of the model, we will show that such complexity could not be observed.

High-Dividend Portfolios Filtered by Financial Performance

2018 ◽  
Vol 2018 (4) ◽  
pp. 59-78
Author(s):  
Sergey Volodin ◽  
Irina Borenko
Keyword(s):  
Financial Performance ◽  
Mutual Funds ◽  
Classical Model ◽  
Theoretical Concept ◽  
Practical Application ◽  
Risk And Return ◽  
Modified Model ◽  
New Model ◽  
Market Index ◽  
Russian Stock Market

In this article the authors consider different strategies related to the high-dividend portfolio investing. The paper provides the examination of the theoretical aspects, methodology and the evolution of the formation of high-dividend models. The author studies the range of classic highdividend portfolios, including a traditional version of the «Dogs of the Dow» strategy, and test it on the Russian stock market (2006-2016). The obtained results confirm the efficiency of this direction of investment. In order to increase the level of returns of high-dividend investing, the authors add into the model two filters on the financial performance P/E and ROA. As shown by calculations, the new model allows to achieve significantly higher results in comparison with the classical version. The following research demonstrates an advantage of the new model in comparison with the returns of the overall market (index strategy “buy and hold”) and in comparison with investing in mutual funds and deposits. The obtained results are meaningful and confirmed by the analysis of the risk and return coefficients, suggesting the possibility of their practical application. The modified model is also able to complement the theoretical concept of high-dividend investment and to eliminate the basic shortcomings inherent in the classical model.

On the Size of Two-Way Reasonable Automata for the Liveness Problem

2018 ◽  
Vol 29 (02) ◽  
pp. 187-211
Author(s):  
Maria Paola Bianchi ◽  
Juraj Hromkovič ◽  
Ivan Kováč
Keyword(s):  
Lower Bounds ◽  
Upper Bounds ◽  
Automata Theory ◽  
Input Word ◽  
Logical Formula ◽  
Lower And Upper Bounds ◽  
Open Problems ◽  
New Model ◽  
The Individual ◽  
Unambiguous Interpretation

The existence of a substantial gap between deterministic and nondeterministic two-way automata is one of the most famous open problems in automata theory. This problem is also related to the fundamental DLOG vs. NLOG question. An exponential gap between the number of states of two-way nondeterministic automata (2NFAS) and their deterministic counterparts (2DFAS) has been proved only for some restrictions of 2DFAS up to now. It seems that the hardness of this problem lies in the fact that, when trying to prove lower bounds, we must consider every possible automaton, without imposing any particular structure or meaning to the states, while when designing a specific automaton, we always assign an unambiguous interpretation to the states. In an attempt to capture the concept of meaning of states, a new model of two-way automata, namely reasonable automaton (RA), was introduced in [6]. In a RA, each state is associated with a logical formula expressing some properties of the input word, and transitions are designed to maintain consistency within this setting. In this paper we extend the study, started in [6], of the descriptional complexity of RAS solving the liveness problem, showing several lower and upper bounds with respect to the logic used for describing the meaning of the individual states.

SYMMETRIES OF THE HUBBARD MODEL AND THE θ TERM IN THE σ-MODEL

1988 ◽  
Vol 03 (17) ◽  
pp. 1725-1732 ◽  
Author(s):  
A.P. BALACHANDRAN ◽  
M.J. BOWICK ◽  
K.S. GUPTA ◽  
A.M. SRIVASTAVA
Keyword(s):  
Gauge Symmetry ◽  
Hubbard Model ◽  
Strong Coupling ◽  
Gauge Invariance ◽  
Strong Coupling Limit ◽  
Modified Model ◽  
Strongly Coupled ◽  
New Model

Recently, it has been shown that the strong coupling limit of the half-filled Hubbard model has SU(2) gauge invariance. The 2+1-dimensional nonlinear a model with the customary θ term does not have this symmetry — instead it has a U(1) gauge symmetry. A modification of the θ term is suggested so that the model acquires SU(2) — or rather SO(3) —gauge symmetry. The symmetries of this modified model thus resemble more closely those of the strongly coupled half-filled Hubbard model. Gauge invariance of the new model, unlike that of the U(1) model, requires quantization of the angle θ. The allowed θ values are mπ/2 ( mod 2π) with m an integer. Hence the allowed soliton spins are m/4 (m∈Z) while their statistics are governed by their spins in the usual way.

The Hitachi Model HS-8 Electron Microscope

1967 ◽  
Vol 25 ◽  
pp. 238-239
Author(s):  
H. Akabori ◽  
K. Nishiwaki ◽  
K. Yoneta
Keyword(s):  
Electron Microscope ◽  
New Model ◽  
Predecessor Model

By improving the predecessor Model HS- 7 electron microscope for the purpose of easier operation, we have recently completed new Model HS-8 electron microscope featuring higher performance and ease of operation.

516: A Simplified Method to Estimate the Absolute Renal Uptake of 99MTC-DMSA: Evaluation with a New Model using the Radioactivity of Nephrectomy Specimens as Reference

2005 ◽  
Vol 173 (4S) ◽  
pp. 140-141
Author(s):  
Mariana Lima ◽  
Celso D. Ramos ◽  
Sérgio Q. Brunetto ◽  
Marcelo Lopes de Lima ◽  
Carla R.M. Sansana ◽  
...  
Keyword(s):  
New Model ◽  
Renal Uptake ◽  
Simplified Method ◽  
The Absolute

Analyzing Stochastic Dependence of Cognitive Processes in Multidimensional Source Recognition

2014 ◽  
Vol 61 (5) ◽  
pp. 402-415 ◽  
Author(s):  
Thorsten Meiser
Keyword(s):  
Cognitive Processes ◽  
Model Complexity ◽  
Multinomial Model ◽  
Stochastic Dependence ◽  
New Model ◽  
Multinomial Processing Tree ◽  
Cognitive States ◽  
The Family ◽  
Tree Models ◽  
Flexible Framework

Stochastic dependence among cognitive processes can be modeled in different ways, and the family of multinomial processing tree models provides a flexible framework for analyzing stochastic dependence among discrete cognitive states. This article presents a multinomial model of multidimensional source recognition that specifies stochastic dependence by a parameter for the joint retrieval of multiple source attributes together with parameters for stochastically independent retrieval. The new model is equivalent to a previous multinomial model of multidimensional source memory for a subset of the parameter space. An empirical application illustrates the advantages of the new multinomial model of joint source recognition. The new model allows for a direct comparison of joint source retrieval across conditions, it avoids statistical problems due to inflated confidence intervals and does not imply a conceptual imbalance between source dimensions. Model selection criteria that take model complexity into account corroborate the new model of joint source recognition.

From Harm to Help: A New Model of Feminist Therapy

1986 ◽  
Vol 31 (2) ◽  
pp. 108-109
Author(s):  
Alexandra G. Kaplan
Keyword(s):  
Feminist Therapy ◽  
New Model
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