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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.
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.
Preparation and Stability of PEGDA/GO Conductive Materials by DLP 3D Printing
Men Thi Hong Nguyen,Su Yeon Kim,Tae Hyeon Jeong,Jong Hoon Kim,Hyoung Sic Cho,Tai Hwan Ha,Sang Jung Ahn,Young Heon Kim 대한금속·재료학회 2022 ELECTRONIC MATERIALS LETTERS Vol.18 No.3
Stable composites of water-dispersed graphene oxide (GO) and UV-cured acrylic resin, poly (ethylene glycol) diacrylate(PEGDA), were prepared to make printed conductive patterns using a digital light processing (DLP) three-dimensional(3D) printing method. The targeted structures were successfully printed by DLP 3D printing and the electrically conductiveproperties were obtained by reducing the insulating GO in the composites to reduced GO by chemical and thermal reductionprocesses. Three basic reduction procedures, pre-thermal, pre-chemical, and post-thermal reduction, were performedto introduce a high conductivity into a printed structure and the lowest resistance was achieved by the pre-thermal reductionin our study. The stability of the printed structures was also evaluated by monitoring the change in resistance with time. Thestrategy pursued by photopolymerization gives the outstanding features of printed structures for extensive applications inthe manufacturing of electronic and sensing devices.
Tax Revenue in ASEAN: Impact Factors and Policy Recommendations
Men Thi BUI,Hang Thi Ngo,Giang Thi Cam NGUYEN,Ha Ngan Duong 사람과세계경영학회 2024 Global Business and Finance Review Vol.29 No.6
Purpose: The paper aims to identify the factors that impact the budget revenues of countries in ASEAN economies. Design/methodology/approach: The paper applies fixed effect and random effect models on a 25-year database of ASEAN economies from 1991 to 2020. Findings: The research reveals that various factors such as trade openness, industry structure, inflation, and tax payment time have a significant impact on tax collection. However, no linkages between tax revenue and foreign direct investment demand and education levels. Factors including industrial proportion (IND), inflation rate (INF), trade openness (IMP), time to pay tax (TIME), and Agricultural added value (AGR) together significantly and statistically affect the tax revenue (TAX). Of these, variables that have a positive relationship with TAX include AGR, IND and TIME while INF is negatively related to tax. Research limitations/implications: The data from 2021 onwards has not been analyzed due to a lack of necessary data, which could show the impact of the COVID-19 pandemic on production and business and its effect on tax revenue. Originality/value: After a comprehensive and thorough variable selection and research design tailored for ASEAN economies, other than estimates on IND, IMP, and INF which are significantly consistent with most of the precedent literature, our research has reached some interesting findings recorded in our new variable (TIME), AGR, and FDI.