E-learning motivation and educational portal acceptance in developing countries

Maldonado, Ursula Paola Torres,Khan, Gohar Feroz,Moon, Junghoon,Rho, Jae Jeung Emerald Group Publishing Limited 2011 ONLINE INFORMATION REVIEW Vol.35 No.1

<B>Purpose</B> - The purpose of this paper is to: empirically validate a modified unified theory of acceptance and use of technology (UTAUT) model by adding an "e-learning motivation" construct in the South American context; try to determine the role of e-learning motivation in the use and adoption of e-learning systems and conversely the effect of technology on students' e-learning motivation; and to test region and gender as moderators in the model. <B>Design/methodology/approach</B> - A survey method was used to collect data from 47 schools located at different regions: the coast, Andes, and jungle of Peru. The partial least square technique was used for data analysis. <B>Findings</B> - It was found that "e-learning motivation" and "social influence" had a positive influence on behavioural intention, while "facilitating condition" had no effect on e-learning portal use. Furthermore, use behaviour had a positive influence on e-learning motivation. Also found was the moderating role of "region". <B>Research limitations/implications</B> - The analysis is carried out in a single country, thus, caution should be taken in generalisation of the results. <B>Practical implications</B> - The findings will help policy makers and practitioners in developing countries to better understand students' e-learning motivation. <B>Originality/value</B> - By adopting the UTAUT model, a new construct of "e-learning motivation" is added, and applied to the South American context.

Determination of Cyclability of Li/FeS₂ Batteries Based on Measurement of Coulombic Efficiency

Maldonado Nogales, Paul,Song, Hee-Youb,Jeong, Soon-Ki Hindawi Limited 2018 Journal of nanomaterials Vol.2018 No.-

<P>The electrochemical performance of negative electrodes based on different FeS2 samples was investigated. The study demonstrated a correlation between the coulombic efficiency obtained over 60 cycles and the capacity loss rate evaluated over 15 cycles. The accuracy of the coulombic efficiency and capacity loss rate measurements was advantageous for predicting the aging behavior of half-cells over a short-term test. A suggested classification of the coulombic efficiency and verification via a numerical analysis were proposed to determine the fading rate of batteries during the galvanostatic test.</P>

Healthcare Information Technology: A Systematic Mapping Study

Enrique Maldonado Belmonte,Salvador Otón Tortosa,Luis de-Marcos Ortega,José-María Gutiérrez-Martínez 대한의료정보학회 2023 Healthcare Informatics Research Vol.29 No.1

Objectives: This paper presents a systematic mapping of studies related to information systems and technology in the field ofhealthcare, enabling a visual mapping of the different lines of knowledge that can provide an overview of the scientific literaturein this field. This map can help to clarify critical aspects of healthcare informatics, such as the main types of informationsystems, the ways in which they integrate with each other, and the technological trends in this field. Methods: Systematicmapping refers to a process of classifying information in a given area of knowledge. It provides an overview of the state of theart in a particular discipline or area of knowledge, establishing a map that describes how knowledge is structured in that particulararea. In this study, we proposed and carried out a specific implementation of the methodology for mapping. In total,1,619 studies that combine knowledge related to information systems, computer science, and healthcare were selected andcompiled from prestigious publications. Results: The results established a distribution of the available literature and identifiedpapers related to certain research questions, thereby providing a map of knowledge that structures the different trendsand main areas of research, making it possible to address the research questions and serving as a guide to deepen specific aspectsof the field of study. Conclusions: We project and propose future research for the trends that stand out because of theirinterest and the possibility of exploring these topics in greater depth.

Influence of temperature on kinetics and hydraulic retention time in discontinuous and continuous anaerobic systems

Santiago Maldonado-Saeteros,Ricardo J. Baquerizo-Crespo,Yunet Gomez-Salcedo,Osney Perez-Ones,Ileana Pereda-Reyes 대한환경공학회 2023 Environmental Engineering Research Vol.28 No.2

Anaerobic digestion (AD) is a biological treatment susceptible to temperature variations. The Arrhenius model and the Van´t Hoff-Arrhenius relationship analyze the temperature effect in AD first-order kinetic constant (k). Kinetic data is relevant for estimating the hydraulic retention time (HRT) in continuous reactors. This research aimed to evaluate the behavior of kinetic constants concerning temperature using the Arrhenius model and Van´t Hoff-Arrhenius relationship and analyze the influence of kinetic constants as estimators of the HRT. The evaluation of the temperature effect in AD analyzed k fit to the Arrhenius model and Van’t Hoff-Arrhenius relationship. The research used data of AD methane yield (B₀) kinetics from the literature, corresponding to macroalgae (MA) (25, 35, 45℃), swine manure (SM) (25, 30, 35℃), and co-digestion of chicken manure with sawdust and miscanthus (CM) (35, 40, 42℃). The Arrhenius model and Van´t Hoff-Arrhenius relationship fitted the data with reduced temperature intervals (ΔT = 5℃). The HRT analysis used a mass balance model considering 80% of the maximum B0 compared with the technical digestion time at 80 (T<SUB>80</SUB>) and 90% (T<SUB>90</SUB>) of the maximum B₀. The results indicate that the HRT calculation is sensitive for k below 0.13 d<SUP>-1</SUP>.

Effect of surface layers produced on lithium metal after heat treatment

( Paul Maldonado Nogales ),정순기 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-

Decades of research have been dedicated to the development and fundamental understanding of the forces that control the native film of Li metal. The representation and the origin of this film still needs more attention due to the lack of complementary information about natural - guided native film formation at high temperatures. In this study, we identify the nature of surface layers formation on lithium metal foil via the heat treatment process at low levels of moisture and oxygen. The heat treatment enables a guided formation of enriches lithium carbonate layer at native film responsible for the formation of stable solid electrolyte interface (SEI) in contact with electrolyte that simultaneously minimizes the decomposition, penetration of the electrolyte, and reaction with the bulk lithium metal under the surface. This natural formation of native film, and later SEI film, shows protection during the deposition-dissolution against short-circuiting, and stability of lithium metal.

Kinematic and deformation analyses of a translational parallel robot for drilling tasks

R. Maldonado-Echegoyen,E. Castillo-Castaneda,M. A. Garcia-Murillo 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.10

A 3DOF translational parallel robot for drilling tasks based on two 5-bar mechanisms with a large workspace is presented in this study. The position analysis is performed by applying simple geometric procedures, and the velocity and acceleration analyses are developedusing the theory of screws. A numerical example is included in the contribution to validate the equations of the kinematic analysis, anddeformation analysis is performed to assess the accuracy considering the forces reported in the literature for drilling process. A prototypeis presented, and an experimental test is performed to validate accuracy using a circular test.

Western Travelers in Colonial Korea: Foreign Perceptions on Legitimacy of the Japanese Rule and the Two Nations

Álvaro Trigo Maldonado 한국학중앙연구원 한국학중앙연구원 2020 THE REVIEW OF KOREAN STUDIES Vol.23 No.1

This paper analyzes the information contained in a variety of travelogues written prior to and after the Japanese annexation of Korea to provide a better understanding on how Westerners perceived the colonial rule. In order to do so quotes on specific topics such as the socio-political situation of Korea or the traveler’s perception on both Korean and Japanese people have been extracted and juxtaposed in an effort of identifying and defining predominant trends. These primary sources need to be approached taking in consideration the Zeitgeist during the period in the West. Their authors depart from a sociopolitical context during which Social Darwinism was in vogue. Besides that, while taking travelogues as a source of historical information has its limitations it also constitutes an excellent way to discuss to what extent the Japanese propaganda effort in the colony was efficient or not. It is also important to note that most of the travelers arrived into Korea via Japan, stayed at the Japanese-managed Chosun Hotel and they often had very limited interactions with Koreans. Thereby they were exposed to the Japanese discourse. This can be perceived in their comparisons between Korean and Japanese customs. However, I would like to argue how their perception on the latter was still influenced by the orientalist discourse as well.

In Vitro Cultivation of Cymatocarpus solearis (Brachycoeliidae) Metacercariae to Obtain the Adult Stage without the Marine Turtle Definitive Host

Mayra Grano-Maldonado,Jose Alvarez-Cadena 대한기생충학열대의학회 2010 The Korean Journal of Parasitology Vol.48 No.1

진드기의 수분조절 생리와 진드기 방제전략

L. Paulina Maldonado-Ruiz,김동흔,박윤성 한국응용곤충학회 2022 한국응용곤충학회지 Vol.61 No.1

진드기는 박테리아, 바이러스, 원생동물 및 균류를 포함한 다양한 병원체를 전달할 수 있는 감염병매개체이다. 진드기는 불리한 환경조건에 서도 생존할 수 있는 능력이 있으며, 흡혈이 필수적인 절지동물의 진화적 산물로써 비흡혈 기간이 장기간 지속되는 경우에도 생존이 가능하다. 특히, 높은 온도와 낮은 습도 환경에서도 견딜 수 있는 수분 조절 메커니즘과 내열성의 생리적 특징은 진드기가 전 세계적으로 분포하도록 한 중요한 요인이다. 진드기의 침샘, 말피기관, 후장 그리고 뇌를 포함하는 여러 기관이 관여하는 물과 이온의 획득 및 배출은 복합적인 메커니즘에 의해 조절 된다. 진드기가 수분을 확보하는 주요 경로는 흡혈과정 또는 공기 중 수증기를 직접 포집하는 방식이며, 이와 더불어 진드기가 자연조건에서 맺힌 물방울을 직접 마시며 수분을 보충한다는 것이 최근 본 연구진의 연구를 통해 밝혀졌다. 물방울에서 획득된 수분은 진드기 침샘의 포도상 부위(유형 I) 또는 중장을 통해 체내로 흡수된다는 것이 형광물질 추적을 통해 확인되었다. 이 연구 결과는 진드기 방제 및 병원체 전파 억제를 위한 전략 개발에 새로운 방향을 제시하였다. 본 종설에서는 진드기 방제를 위한 잠재적 표적인 진드기의 수분조절 및 표피 배설의 생리적 메커니즘을 종합적으로 다룬다.

The gut bacteria symbionts from the monophagous insect Acrobasis nuxvorellaproduce tannase for the digestion of Carya illinoinensis tannins

Consuelo G. Corrales-Maldonado,Vargas-Arispuro Irasema,Luis Martínez-Carrillo José,Pérez-Morales Rosalva,Ángel Martínez-Téllez Miguel,Aispuro-Hernández Emmanuel,Arellano-Gil Maritza,Castro-Espinoza Lu 한국응용곤충학회 2022 Journal of Asia-Pacific Entomology Vol.25 No.4

Acrobasis nuxvorella Neuzing (Lepidoptera: Pyralidae), or the Pecan Nut Casebearer (PNC), is a monophagous pecan nut [Carya illinoinensis (Wang) K. Koch] herbivore. This insect has caused major crop losses, despite pecan nut trees producing a high concentration of tannins, which are deterrent compounds for insects. The PNC consumes and processes tannin-rich tissues without any negative effects on its nutrition. Certain bacterial species of the herbivore gut microbiota have been proven to produce tannase, therefore, we hypothesize that the PNC has symbiotic bacteria that produce tannase for the digestion of tannin contained in their food. In this work, live PNC larvae were extracted from pecan nutlets. The larval guts were dissected and their contents were cultured to obtain the cultivable bacteria. A total of 224 bacterial isolates were recovered, 19 of which tested positive for tannase activity. Isolates LB66, LB24, TT29, and TP8 displayed comparable activity to the control strain Pseudomonas aeruginosa. Further enzyme semi-purification steps showed specific tannase ac tivity values in the range of 39.5–3.7 U/mg of protein. The isolates were identified as Bacillus pumilus strain TT29, Bacillus pumilus strain LB66, Bacillus pumilus strain LB24 and Sthaphylococcus warneri (TP8) by 16S ribo somal RNA gene sequencing. Our findings indicate that PNC larvae contain gut bacteria able to produce tannase that hydrolyze the galloyl ester bonds in tannins.