• Journal of Institute of Control, Robotics and Systems
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• v.14 no.9
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• pp.916-924
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• 2008

In this paper dynamic modeling parameters were estimated using a frequency domain estimation method. A systematic flight test method was employed using preprogrammed multistep excitation of the swashplate control input. In addition when one axis is excited, the autopilot is engaged in the other axis, thereby obtaining high-quality flight data. A dynamic model was derived for a small scale unmanned helicopter (CNUHELI-020, developed by Chungnam National University) equipped with a Bell-Hiller stabilizer bar. Six degree of freedom equations of motion were derived using the total forces and moments acting on the small scale helicopter. The dynamics of the main rotor is simplified by the first order tip-path plane, and the aerodynamic effects of fuselage, tail rotor, engine, and horizontal/vertical stabilizer were considered. Trim analysis and linearized model were used as a basic model for the parameter estimation. Doublet and multistep inputs are used to excite dynamic motions of the helicopter. The system and input matrices were estimated in the frequency domain using the equation error method in order to match the data of flight test with those of the dynamic modeling. The dynamic modeling and the flight test show similar time responses, which validates the consequence of analytic modeling and the procedures of parameter estimation.

• Journal of Information Technology Applications and Management
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• v.9 no.1
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• pp.85-96
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• 2002

Nowadays an information exchange on XML such as B2B electronic commerce is spreading. Therefore the systematic and stable management mechanism for storing the exchanged Information is needed. For this goal there are many research activities for connection between XML application and relational database. But because XML data have hierarchical structures and relational database can store only flat-structured data, we need to store XML data in object-oriented database that support hierarchical structure. Accordingly the modeling methodology for storing XML data in object-oriented database is needed. In order to build good quality application systems, modeling is an important first step. In 1997, the OMG adopted the UML as its standard modeling language. Since industry has warmly embraced UML, its popularity should become more important in the future. So a design methodology based on UML is need to develop efficiently XML applications. In this paper, we propose a unified design methodology for XML applications based on object- oriented database using UML. To this goal, first we introduce a XML modeling methodology to design W3C XML schema using UML and second we propose data modeling methodology for object-oriented database schema to store efficiently XML data in object-oriented databases.

• The Journal of Asian Finance, Economics and Business
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• v.7 no.12
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• pp.491-500
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• 2020

The purpose of this study was to analyze the antecedents of student loyalty which included Servicescape University, relationship quality, university image, and student satisfaction. The research was conducted in three universities with Islamic atmosphere under Al Washliyah Foundation in Medan, North Sumatra Province, Indonesia. Data analysis in this study includes descriptive analysis and Structural Equation Modeling (SEM). The results showed that: (1) Servicescape university influences university image, student satisfaction, but does not influence student loyalty; (2) Servicescape university through university image influences student loyalty, (3) Servicescape university through student satisfaction influences student loyalty, (4) Relationship quality influences university image, satisfaction Students, but does not influence student loyalty, (5) Relationship quality through university image influences student loyalty, (6) Relationship quality through student satisfaction influences student loyalty, (7) University image influences student loyalty, and (8). Student satisfaction influences student royalty. The findings of this study suggest that the antecedent of student loyalty in universities with Islamic atmosphere which was examined in this research includes four factors: Servicescape university, quality relationship, university image, and students' satisfaction.

• Journal of Environmental Science International
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• v.9 no.6
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• pp.455-462
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• 2000

This study aims at the development of the model for a forecasting of water quality in river basins using artificial neural network technique. Water quality by Artificial Neural Network Model forecasted and compared with observed values at the Sangju q and Dalsung stations in Nakdong river basin. For it, a multi-layer neural network was constructed to forecast river water quality. The neural network learns continuous-valued input and output data. Input data was selected as BOD, CO discharge and precipitation. As a result, it showed that method III of three methods was suitable more han other methods by statistical test(ME, MSE, Bias and VER). Therefore, it showed that Artificial Neural Network Model was suitable for forecasting river water quality.

• Korean Journal of Child Studies
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• v.31 no.2
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• pp.85-101
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• 2010

The purpose of this study was to examine the pathway in which children characteristics, maternal warmth, and children's academic competence affect the quality of children's peer relationships. A total of 291 children (Mage=11.4) responded to questionnaires DOTS-R (Windle & Lerner, 1986), MBRI (Schaefer, 1959), Academic Self-Efficacy Scale (Kim & Park, 2002), and FQQ (Parker & Asher, 1993). Data were analyzed via Structural Equation Modeling. Our results indicated that children's academic competence fully mediated the association between temperament and the quality of peer relationships, whereas it was a partial mediator in relations between maternal warmth and the quality of peer relationships. A difference in terms of gender was also present in this path model. In conclusion, children's temperaments and maternal warmth affected the quality of peer relationships both directly and indirectly through children's academic competence.

• Korean Journal of Childcare and Education
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• v.14 no.3
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• pp.21-39
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• 2018

Objective: This study was to examined the mediating effect of active emotion regulation and marital quality in the relationships between self-compassion and maternal-fetal attachment. Methods: A questionnaire was administered to 836 pregnant women and the data were analyzed by SPSS21 and M-plus7, and statistical analysis, frequency analysis, and then structural equation modeling were performed. Results: First, self-compassion directly affects maternal-fetal attachment. Second, self-compassion was indirectly influenced by maternal-fetal attachment through active emotional regulation. Third, self-compassion indirectly affects maternal-fetal attachment through marital quality. Fourth, in regards to the relationship between self-compassion and maternal-fetal attachment, active emotional regulation and marital quality were mediated. Conclusion/Implications: we discussed implications for enhancing self-compassion and active emotional regulation and enhancing marital quality to increase the maternal-fetal attachment of pregnant women.

• International Journal of Contents
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• v.8 no.1
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• pp.61-68
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• 2012

Previous research on online health (e-health) information was primarily focused on consumer information search behavior and information quality. Although studies addressing online information quality have flourished, they have yet to thoroughly examine whether consumers actually use the information they search. The purspose of this study suggests a conceptual framework that examines the potential antecedents of a consumers' willingness to depend on e-health information as an indicator of the consumer's trust of the provided e-health information. The proposed antecedents include healthcare product involvement, online skill level, perceived quality, and credibility of the source. Using structural equation modeling on online survey data, seven hypotheses, which describe the relationships between the variables of the model, were tested. The results indicate that consumer willingness to depend on provided e-health information was significantly influenced by the consumers' perceived quality and credibility of specific e-health information. Consumer involvement in healthcare and their online skill-level, respectively, also positively related to perceived quality and credibility regarding e-health information.

• Korean Journal of Computational Design and Engineering
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• v.17 no.3
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• pp.164-174
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• 2012

The recent introduction of BIM technology has raised the interest on the BIM quality assurance and management more than ever. This study aims to consider the ways of BIM quality improvement by analyzing the most frequent issues rising from multiple BIM projects. For this purpose, the 12 test models from BIM education program hosted by buildingSMART Korea are investigated based on the requirements in the public BIM guidelines. All the BIM issues generated are categorized by the criteria applied and analyzed for each kind of building element. The results showed that more than half of the issued at least could be cleared out by improving modeling habits and technical guides.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2012.05a
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• pp.35-36
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• 2012

BIM technology accomplished quantitative development being utilized in various disciplines. However, it is necessary to develop environment and requirement for qualitative improvement of BIM-based project in current transitional period of adopting BIM. The purpose of this study is to develop and apply of quality control requirement for improving the quality of BIM-based architectural design through case study. In particular, by focusing on BIM quality control and its relevant subjects, the minimum standards for BIM quality management are suggested. Also, BIM template is suggested to support the effective application of BIM-based architectural design.

• Journal of the Korean Society of Clothing and Textiles
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• v.34 no.6
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• pp.1033-1041
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• 2010

This study investigates the combined effect of clothing interest and fashion innovativeness on dimensions of scent quality (pleasantness, intensity, familiarity, and congruency) to understand which dimensions of scent quality have significant positive effects on the appeal of scented apparel products. The survey data were statistically analyzed. A structural equation modeling using LISREL was conducted to test the model. Results indicate that clothing interest has a significant impact on scent quality attitude. Positive evaluations of the product were most strongly influenced by the pleasantness quality of the scent. Intensity and familiarity were factors that affected the approach of consumer responses toward scented products. Congruency was not a significant scent quality in generating positive responses for apparel products among consumers.