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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.
Determinants Affecting Profitability of Firms: A Study of Oil and Gas Industry in Vietnam
Men Thi BUI,Hieu Minh NGUYEN 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.1
The oil and gas industry is widely known as a vital engine of Vietnam development, stimulating researchers to examine the association of various factors with this industry. The aim of this study is to identify the relationship between different variables affecting profitability of the firms in the oil and gas sector in Vietnam. The total of 203 samples were collected from 29 companies listed on Vietnam Stock Market during a 6-year period from 2012 to 2018. Informed by prior research, this investigation employs financial leverage (FL), government ownership (GOV), dividend payout (DIV), fixed assets to total assets (FA) and exchange rate (EXR) as independent variables, while the profit is described by return-on-assets (ROA). The study results show that there are four factors that have an impact on ROA, namely, leverage, government ownership, dividend, and exchange rate. Whereas leverage and exchange rate have negative influence on ROA, government ownership and dividend payment have a positive effect. The findings of this study suggest that high debt ratio in capital structure and the negative effect of exchange rate on their companies’ efficiency can adversely affect the profit of enterprises. Also, plausible extent of government ownership and dividend payment could also be considered to optimize corporate performance.
( Men Sokkeang ),김양진 ( Ryangjin Kim ) 우리어문학회 2017 우리어문연구 Vol.58 No.-
본고는 `(어)하다` 구문과 `(-어)지다` 구문에 대한 `띄어쓰기 문제`와 `분리가능성 여부의 문제`를 중심으로 이 두 구문의 `접어성`에서의 공통점과 차이점을 논의하였다. 본고에서 논의된 내용의 핵심을 간략히 부연하면 다음과 같다. 첫째, `(-어)하다` 구문은 `(-어)지다` 구문에 비해 결합할 수 있는 선행용언은 제약적이지만 생산적이어서 `(-어)지다` 구문보다 더 많은 조건에서 보조사와의 결합가능성이 높아, 분리 가능성에서 `덜 제약적`이다. 둘째, `(-어)지다` 구문은 `(-어)하다` 구문에 비해 결합할 수 있는 선행용언의 범위가 넓지만 보조사에 의한 결합 조건에서 `더 제약적`이다. 다시 말하면, 접어성의 관점에서 볼 때, 한국어의 `(-어)하다` 구문은 일반적인 보조용언 구성에 비해 결합가능성이 높지만 분리가능성이 있어서 `덜 접어적`인 속성(즉, `중간적인 접어성`)을 지니며, `(-어)지다` 구문은 결합 조건이 긴밀하고 분리가능성이 매우 제약적이어서 `더 접어적`인 속성(즉 `더 강한 접어성`)을 가진 구문으로 이해된다는 것이다. This paper discusses commonalities and differences in the `cliticness` of these two following phrases, focusing on `problems of word spacing` and `problems of separation possibility` with respect to `-□ hada` phrase` and `-□ jida` phrase. The following is a summary of the key points discussed in this paper. First, `-□ hada` phrase is a sentence structure term that is more restrictive than `-□ jida` phrase, but is more productive than `-□ jida` phrase. It is likely to be less restrictive in separability. Second, The phrase `-□ jida` phrase has a wide range of predicates that it can be combined with. However, it is not as productive as the `-□ hada` phrase, and is `more restrictive` in the condition of attachment by auxiliary verb construction. In other words, from the viewpoint of clitic, the Korean `-□ hada` phrase` syntax is more likely to be a `clitic` (ie, `middle clitic`), And the `-□ jida` phrase statement is understood as a phrase with more clitic attributes (ie, stronger clitic`) because the combining condition is tight and the separability is very restrictive.