• 제어로봇시스템학회:학술대회논문집
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• 2003.10a
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• pp.316-321
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• 2003

This paper presents a design method of the wavelet neural network based controller using direct adaptive control method to deal with a stable intelligent control of chaotic systems. The various uncertainties, such as mechanical parametric variation, external disturbance, and unstructured uncertainty influence the control performance. However, the conventional control methods such as optimal control, adaptive control and robust control may not be feasible when an explicit, faithful mathematical model cannot be constructed. Therefore, an intelligent control system that is an on-line trained WNN controller based on direct adaptive control method with adaptive learning rates is proposed to control chaotic nonlinear systems whose mathematical models are not available. The adaptive learning rates are derived in the sense of discrete-type Lyapunov stability theorem, so that the convergence of the tracking error can be guaranteed in the closed-loop system. In the whole design process, the strict constrained conditions and prior knowledge of the controlled plant are not necessary due to the powerful learning ability of the proposed intelligent control system. The gradient-descent method is used for training a wavelet neural network controller of chaotic systems. Finally, the effectiveness and feasibility of the proposed control method is demonstrated with application to the chaotic systems.

• The Korean Journal of Community Living Science
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• v.25 no.4
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• pp.435-448
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• 2014

This study analyzes the differences in school life satisfaction according to middle school students' general characteristics, including their gender, grade, monthly household income, and parents' education level, and examines the effects of intimacy with parents, optimism, and learning motivation on school life satisfaction. Data were collected from 380 middle school students by using a socio-demographic questionnaire. A measurement tool for intimacy with parents, optimism, learning motivation, and school life satisfaction was used, and a frequency analysis, a t-test, a one-way ANOVA, a correlation analysis, and a path analysis were conducted. School life satisfaction showed differences in terms of middle school students grade and, parental education but there were no meaningful differences in terms of their gender and monthly household income. Intimacy with parents and optimism had direct effects on motivation; intimacy with the father and optimism had direct and indirect effects, respectively; and intimacy with the mother had an indirect effect. An increase in the level of intimacy between parents and students and an increase in the positive perception of oneself facilitated learning motivation as well as school life satisfaction.

• Journal of Korean Clinical Health Science
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• v.6 no.2
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• pp.1136-1146
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• 2018

purpose: The study was performed by targeting nursing students in order to examine the level of their self-directed learning ability, self efficacy and learner satisfaction and to identify their effects on learner satisfaction. methods: A structured self-administered questionnaire was used, and a total of 150 questionnaires were distribute. Data were collected from 150 nursing students at D university located in D city, and a total of 141 students were included for the final analysis. Data were collected between November 15, 2017 to December 16, 2017, and questionnaire comprised items to measure general characteristics, self-directed learning ability, self efficacy and learner satisfaction. results: In addition, learner satisfaction was positively correlated with self-direct learning ability, self-efficacy. Finally, self-direct learning ability, self-efficacy and interpersonal relationship were found to explain 42.9% of the variance of learner satisfaction. conclusion: The findings of this study could be utilized as base data when developing a program to enhance nursing students's learner satisfaction and it is suggested that an interventional research of analyzing validity and effectiveness of developed education program would be also required.

• 제어로봇시스템학회:학술대회논문집
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• 1990.10b
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• pp.1173-1177
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• 1990

Cerebellar Model Linear Associator Net(CMLAN), a kind of neuro-net based adaptive control function generator, was applied to the problem of direct inverse calibration of three and six d.o.f. POMA 560 robot. Since CMLAN autonomously maps and generalizes a desired system function via learning on the sampled input/output pair nodes, CMLAN allows no knowledge in system modeling and other error sources. The CMLAN based direct inverse calibration avoids the complex procedure of identifying various system parameters such as geometric(kinematic) or nongeometric(dynamic) ones and generates the corresponding desired compensated joint commands directly to each joint for given target commands in the world coordinate. The generated net outputs automatically handles the effect of unknown system parameters and dynamic error sources. On-line sequential learning on the prespecified sampled nodes requires only the measurement of the corresponding tool tip locations for three d.o.f. manipulator but location and orientation for six d.o.f. manipulator. The proposed calibration procedure can be applied to any robot.

• Journal of Digital Convergence
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• v.19 no.9
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• pp.59-65
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• 2021

This study intends to find a positive effect on the learning of elementary school students by developing the exhibition contents of on-offline museum. This on-offline museum contents were combined with existing exhibit types and direct experience elements, and the theory of [blended learning]. Through this study, analyzing the limitations of existing online museum and finding with experiment to see if the new contents had a learning effect compared to the existing online museum. As a result of the experimental study, the content with a [direct experience] was counted as a high satisfaction and frequency index, and the [play] and [experience] type of direct experience contents showed higher satisfaction than the indirect experience type contents. Through this study, we want to provide new implications and development possibilities in the development of contents that online museums can provide, and to promote various effects on children's education.

• 제어로봇시스템학회:학술대회논문집
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• 2003.10a
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• pp.96-100
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• 2003

In this paper, a DLC method is proposed for linear feedback systems to improve the tracking performance when the task of the system is repetitive. DLC can generate the desired control input directly from the previously learned control inputs corresponding to other output trajectories. It is assumed that all the desired output functions considered in this paper have some relations called proportionality and it is shown by mathematical analysis that DLC can be utilized to generate additional control efforts for the perfect tracking. To show the validity and tracking performance of the proposed method, some simulations are performed for the tracking control of a linear system with a PI controller.

• Hwankyungkyoyuk
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• v.22 no.3
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• pp.72-82
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• 2009

The purpose of this study was to develope experience-education program for elementary students which use environmental resources and learning sources of Jeju island. This study designed developing framework of environmental education program for using local resources and developed experience-education program on the basis of it. Especially this program consisted of direct experience, indirect experience, and local community learning. This program consisted of five activities -'Jeju's water', 'Mecca of wind power', 'Rushing jellyfish', 'Ramsar wetland', and 'Searching the fossil'. Each activity themes was to use environmental resources of Jeju island. And this program had relationship with science, social studies, and ethics in the curriculum. The result of this study will serve to activate environmental education program for using local resources if we solve program's problem through application process.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.17 no.8
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• pp.846-855
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• 1992

In this paper, the decrease multipoint search method and Its learning algorithm for optimum value computatlon method of object function Is proposed. Using this method, the number of evaluation point according to searching time can t)e reduced multipoint of the direct search method by applying the unlivarlate method. And the learning algorithm can reprat the same search method in a new established boundary by using the searched result. In order to Investigate the efficience of algorithm, this method this method is applied to Rosenbrock and Powell, Colvelle function that are Impossible or uncertain in traditional direct search method. And the result of application, the optimum value searching oil every function Is successful. Especially, the algorithm is certified as a good calculation method for producing global(absolute) optimum value.

• Educational Technology International
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• v.15 no.2
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• pp.143-170
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• 2014

As it was argued that students' cognitive engagement can be, at least in part, modified by individual or learning environmental factors, prior studies have attempted to identify the factors explaining the variability of students' cognitive engagement. This literature review has shown that students' cognitive engagement can be altered by various elements in the learning environment design such as factors related students' perceptions of teaching quality, characteristics of tasks and learning activities, teachers' behaviors during instruction, classroom goal structures, the integration of student oriented learning, action learning, problem-based learning, and constructivist learning, and academic disciplines. Based on the review, this study suggests that more studies are required to focus on understandings how the integration of instructional design principles into courses and the levels of student cognitive engagement in these courses are related. Also, an investigation of direct and indirect effect of learning environments taking into account students' personal factors would provide a more accurate picture of the relationship between learning environmental factors and students' cognitive engagement.

• The Journal of the Korea Contents Association
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• v.19 no.6
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• pp.605-619
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• 2019

This study aimed to examine the mediating roles of self-determined motivations on the effect of class climate perceived by middle school students on self-regulated learning ablility. For this purpose, a total of 589 students were selected as subjects in this research. Structural equation modeling was conducted so as to verify the relationship among all the variables. As a results, first, the perceived autonomous class climate had a direct effect on self-regulated learning ability and an indirect effect on self-regulated learning ability through the mediation effect of identified regulation. Second, the perceived controlled class climate had a direct effect on self-regulated learning ability and an indirect effect on self-regulated learning ability through the mediation effect of identified regulation, introjected regulation, and external regulation. This study implies that facilitating autonomous engagement in learning activities will be a effective educational intervention to improve self-regulated learning ability.