• Journal of Institute of Control, Robotics and Systems
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• v.6 no.3
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• pp.263-272
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• 2000

In this paper we give some geometric condition for a stochastic nonlinear system and we propose a control method for a stochastic nonlinear system using neural networks. Since a competitive learning neural networks has been developed based on the stochastcic approximation method it is regarded as a stochastic recursive filter algorithm. In addition we provide a filtering and control condition for a stochastic nonlinear system called the perfect filtering condition in a viewpoint of stochastic geometry. The stochastic nonlinear system satisfying the perfect filtering condition is decoupled with a deterministic part and purely semi martingale part. Hence the above system can be controlled by conventional control laws and various intelligent control laws. Computer simulation shows that the stochastic nonlinear system satisfying the perfect filtering condition is controllable and the proposed neural controller is more efficient than the conventional LQG controller and the canonical LQ-Neural controller.

• Journal of Information Technology Services
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• v.9 no.1
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• pp.113-125
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• 2010

Recently, a smart space with Ubiquitous Environment is expanding rapidly due to the development of Ubiquitous Sensor Network. Therefore, more appropriate and intelligent services of the context awareness system is being required. The previous context awareness system can provide a service to the user through the inference only on the current situation. But, it does not handle certain situation properly when the system provides abnormal result. Also it does not have any proper method of generating reliable semantic data from sensed raw data. In this paper, we are trying to solve the problems as the following approaches. First, the system recognizes abnormal result and corrects it by learning feedback from the user. Second, we suggest a method of converting sensed data into more reliable semantic data. Third, we build the system based on an Ontological context model that is capable of interoperability and reusability. Therefore, the context awareness system of our study can enhance the previous system that can generate more reliable context data, can provide more effective inference method, and can provide more intelligent system structure.

• Proceedings of the Korean Information Science Society Conference
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• 2001.04b
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• pp.676-678
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• 2001

언어는 모든 교육에서 중요한 역할을 담당하므로 국어 교과목은 교육의 기본 목표인 언어사용의 신장을 위해서 중요하게 다루어지고 있다. 언어발달을 위한 국어 교육활동은 듣기, 말하기, 읽기, 쓰기의 네 가지 영역에 기초를 두고 있으며 학생들의 흥미를 유발할 수 있는 쌍방향 멀티미디어를 이용하면 이러한 영역의 학습효과를 증가시킬 수 있다. 그러나 기존의 웹사이트의 개발 사례를 살펴보면 교과서 중심인 일방적인 제사만이 구현되어 있다. 따라서 본 논문에서는 흥미와 자발적인 참여를 유발하고 행동한 것에 대해 즉각적인 반응(Feedback)을 주는 애니메이션과 음성, 효과음, 높이, 학습, 게임으로 결합된 오락적인 쌍방향 멀티미디어 웹 컨텐츠를 개발하여 언어를 배우는 어린이들의 학습능력의 향상과 창의적인 언어 활동의 증대에 기여하고자 한다. 특히, 이 시스템의 큰 특징은 학생에 대한 학습 결과를 도출하고 이에 대한 해결책 및 각종 정보를 추출하여 학습진단 결과, 재학습, 학습독력의 형태로 학생 개개인에게 메일로 보내는 학습 통합관리 기능을 포함하고 있다는 것이다.

• Proceedings of the KIEE Conference
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• 1997.07b
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• pp.609-611
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• 1997

In this paper, we propose the self-tuning of PID controller using diagonal recurrent neural networks. The characteristic of the proposed structure is on-line adaptive learning scheme in spite of variations of feedback, signals. Control performance is compared with that of neural network based PID controller which was proposed by Iwasa. Computer simulation results show that the proposed controller is effective in controlling of unknown nonlinear plants.

• English Language & Literature Teaching
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• v.18 no.3
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• pp.53-75
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• 2012

The present study examined the role of language proficiency in dyadic discourse in the organization of repairs and the distribution of linguistic features contained in repairs. One native speaker of English and five non-native speakers participated and formed three dyads: one same-proficiency NNS-NNS (non-native speaker), one different-proficiency NNS-NNS, and one NS (native speaker)-NNS dyads. Results showed that overall repair patterns in this type of interaction were more conversational than didactic, and that the degree of difference in proficiency between the participants in the dyad influenced repair patterns and the distribution of linguistic features in relation to repair patterns. Also, discussed in the present paper are some implications of the results and other issues related to language learning.

• English Language & Literature Teaching
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• v.13 no.2
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• pp.129-153
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• 2007

When English language teachers are deciding on their priorities for teaching pronunciation, it is imperative to know what kind of differences and errors are most likely to interfere with communication, and what special problems particular first-language speakers will have with English pronunciation. In other words, phoneme discrimination skill is an integral part of speech processing for the EFL learners' learning to converse in English. Training using sound visualization technique can be effective in improving second language learners' perceptions and productions of segmental and suprasegmental speech contrasts. This study assessed the efficacy of a pronunciation training that provided visual feedback for EFL learners acquiring pitch and durational contrasts to produce and perceive English phonemic distinctions. The subjects' ability to produce and to perceive novel English words was tested in two contexts before and after training; words in isolation and words in sentences. In comparison with an untrained control group, trainees showed improved perceptual and productive performance, transferred their knowledge to new contexts, and maintained their improvement three months after training. These findings support the feasibility of learner-centered programs using sound visualization technique for English language pronunciation instruction.

• English Language & Literature Teaching
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• v.13 no.2
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• pp.91-108
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• 2007

This study investigates learners' perception on their engagement in rating activities in the EFL essay-writing context. The current study aims to address the answers to the following research questions: 1) What attitude do students show about their participation in the rating tasks? and 2) which of three aspects (e.g. the degree of rating experience, the exposure to English composition instruction and learning, and proficiency level) significantly influences learners' rating activities? 104 EFL learners participated in the rater training session. After participants finished rater training session, they rated three sample essays and peer essays using the given scoring guide. Based on the analysis of survey responses that students made, students showed positive attitude toward their engagement in rating tasks. For research question 2, only L2 writing proficiency seriously affected students' perception on the rating tasks. Advanced level of subjects did not feel stressed by a grade of peers as low level of subjects did. They were also critical about the benefits of self- and peer-assessment, suggesting that a peer's feedback on their own essay was not so useful and that a self-rating does not fully help learners identify their writing proficiency.

• 한국정보교육학회:학술대회논문집
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• 2007.01a
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• pp.245-254
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• 2007

본연구는 문제중심해결 과정에서 나타나는 뇌파를 활용한 뉴로피드백 훈련방법으로 자신의 의지에 의해 적절한 뇌파를 구성하여 문제기반 인지능력을 향상시키게 된다. 다양한 영재학습 유형 및 영재아를 뇌파분석에 따른 영역화를 통하여 객관적인 문제기반접근을 통한 표준화된 학습모형을 설계한 것이다. 뇌파는 뇌의 활동상태에 따라 다르게 나타나며, 자신의 뇌에 다양한 훈련으로 피드백을 받게 되면 특정파에 대한 조절능력을 갖게 된다. 본 연구에서는 뇌파조절을 통한 영재학습모형을 개발하여 영재학습능력 향상을 위한 영재프로그램의 설계모형을 개발하였다.

• JSTS:Journal of Semiconductor Technology and Science
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• v.14 no.6
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• pp.755-759
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• 2014

We propose an integrate-and-fire neuron circuit and synaptic devices with the floating body MOSFETs. The synaptic devices consist of a floating body MOSFET to imitate biological synaptic characteristics. The synaptic learning is performed by hole accumulation. The synaptic device has short-term and long-term memory in a single silicon device. I&F neuron circuit emulate the biological neuron characteristics such as integration, threshold triggering, output generation, and refractory period, using floating body MOSFET. The neuron circuit sends feedback signal to the synaptic transistor for long-term memory.

• Child Health Nursing Research
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• v.10 no.4
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• pp.460-467
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• 2004

Purpose: The purpose of this study was to develop a program promoting self-esteem and to determine the effectiveness of the program for hospitalized school-aged children. Method: The sample group consisted of 68 hospitalized children in a University Hospital located in Busan. The experimental group was given the program and feedback was obtained 3 times up until the day of discharge. Data were analyzed using t-test and 2-way ANOVA with the SPSS program package. Result: There was a significant difference between experimental and control groups in self-esteem. Conclusion: It was found that the program promoting self-esteem in school aged children was effective. The program, which was based on learning theory, was shown to be an effective and strong method to promote adjustment in hospitalized school-aged children.