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Stein-type estimation in logistic regression models based on minimum Φ-divergence estimators
M.L. Menéndez,L. Pardo,M.C. Pardo 한국통계학회 2009 Journal of the Korean Statistical Society Vol.38 No.1
In this paper we present a study of Stein-type estimators for the unknown parameters in logistic regression models when it is suspected that the parameters may be restricted to a subspace of the parameter space. The Stein-type estimators studied are based on the minimum phi-divergence estimator instead on the maximum likelihood estimator as well as on phi-divergence test statistics.
Kinetic study and hydrogen peroxide consumption of phenolic compounds oxidation by Fenton’s reagent
Ana de Luis,Amaia Menéndez,José Ignacio Lombraña,Fernando Varona 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.1
Synthetic solutions of phenol, o-, m- and p-cresol were oxidised by using Fenton’s reagent. The application of substoichiometric dosage of H2O2 led to the formation of intermediate compounds, continuing later the oxidation to complete oxidation. An important objective was to analyze the effect of hydrogen peroxide dosage applied and the reaction pH together with the iron oxidation state on the degradation level. A kinetic model was derived from a reaction mechanism postulated which was used to analyze the results of the experiments. Another aim was to analyze the hydrogen peroxide consumption. Noteworthy results include an increase in oxidant consumption to intensify phenol removal. Furthermore, oxidant consumption was analyzed through the ratio H2O2 to phenol removed and the average specific rate of removal (ASRR). By analyzing these two parameters it has been possible to ascertain the most favorable strategy for an efficient application of H2O2.
Santy Peraza-Echeverria,Jorge M. Santamaría,Gabriela Fuentes,Mariana de los Ángeles Menéndez-Cerón,Miguel Ángel Vallejo-Reyna,Virginia Aurora Herrera-Valencia 한국유전학회 2012 Genes & Genomics Vol.34 No.4
The NPR1 (non-expressor of pathogenesis related gene 1) gene was initially identified in Arabidopsis as a master regulator of the systemic acquired resistance (SAR). Five additional NPR1 homologues have been identified in Arabidopsis whose function range from regulators of SAR to plant development. In the present study, we characterized the structure, phylogeny and expression of the NPR1 family in papaya (Carica papaya L.), one of the most important tropical fruit crops. We identified four NPR1 homologues in the papaya genome sequence (CpNPR1 to CpNPR4). Overall, the four papaya predicted NPR1 proteins showed the characteristic BTB/POZ and ankyrin domains of the Arabidopsis NPR1 family. Twelve additional open reading frames showing homology to retrotransposon elements or genes involved in different physiological processes were found in close proximity to the papaya NPR1homologues. The phylogenetic analysis revealed that the papaya NPR1 sequences resolved in three clades, each clade containing two Arabidopsis NPR1 homologues involved either in the positive regulation of SAR (clade I), negative regulation of SAR (clade II) or plant development (clade III), suggesting a similar function for the corresponding papaya NPR1homologues. Furthermore, the expression of the four papaya NPR1 homologues was detected in both vegetative and reproductive tissues. The present study has provided the first comparative analysis of the NPR1 family in a tropical fruit crop and expanded our knowledge on this type of genes in dicotyledoneous plants. The identification of the full set of papaya NPR1 homologues will pave the way for their systematic functional analysis and new opportunities for engineering disease resistance in this crop.
A. Sanz-Martínez,J. Lasobras,J. Soler,J. Herguido,M. Menéndez 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.113 No.-
Methanol to Gasoline (MTG) process transforms methanol to hydrocarbons within the boiling point rangeof gasoline. The result is a wide spectrum of products (olefins, paraffins, aromatics and naphthenics,among others), with the total conversion of methanol to hydrocarbons and water. Catalyst deactivationby coke is a main problem in this process. This work aims to determine the feasibility of carrying out theproduction of gasoline from methanol in a two-zone fluidized bed reactor (TZFBR). The hypothesis is thatthe formation of carbonaceous deposits (coke) on the catalyst particles can be counteracted by its combustionin the regeneration zone that this novel reactor presents, thus achieving stable and continuousoperation. In this way, both processes (reaction and regeneration) would be being carried out simultaneouslyin the same reactor (process intensification). The comparison of results between a conventional fluidizedbed reactor and a TZFBR shows that the second one actually provides a better stability over time.
Introspection and countermeasure on fair value information under financial crisis
MEN Rong,Cui Yongmei,MA Zhong 인하대학교 정석물류통상연구원 2009 인하대학교 정석물류통상연구원 학술대회 Vol.2009 No.10
Based on behavior financial theory, the paper illustrates that due to increasing of arbitrage cost and noisy investors, fair value of assets based on market transaction will depart away from their inherent value. Invesors and creditors may rectify their value information for continuously operating enterprises by making deep analysis on enterprises" information like market environment, core competitive ability, cash flow and risk management.
Comparisons of 4WS and Brake-FAS based on IMC for vehicle stability control
Men Jinlai,Wu Bofu,Chen Jie 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.5
The paper proposes a multi-input-multi-output internal model control (MIMO IMC) based on combined brake and front wheel active steering (Brake-FAS) for vehicle stability control and makes comparisons with the four wheel steering internal model control (4WS IMC). Brake control would change vehicle velocity which will make the vehicle control model nonlinear. To solve the nonlinearity involved in the Brake-FAS, an inverse system method is introduced to turn the nonlinear internal vehicle model into a pseudo-linear system,and then the design of main IMC controller and related filters is discussed in details. Comparisons of the Brake-FAS IMC and 4WS IMC were done on the basis of simulations which were composed of different combinations of driving maneuvers and road conditions in Simulink where an 11DOF vehicle model verified by CarSim7 was built.