• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2012.05a
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• pp.353-357
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• 2012

요즘 모든 분야에서 실세계의 상황정보 인지를 통해 전자공간과 물리공간을 결합할 수 있는 유비쿼터스 컴퓨팅의 기반 기술을 사용하여 센서와 무선 통신 기술을 결합한 무선 센서 네트워크에 대한 연구가 활발히 이루어지고 있는 추세이다. 또한 선박에서도 유무선 기술을 융합하여 지능형 선박에 적합한 Ship Area Network(SAN) 연구가 진행되고 있으나, 다양한 유무선 네트워크 연동 SAN-브릿지 기술, 이종 센서, 제어기기를 자율적으로 구성관리하거나 상호연동, 원격제어 하는 자율 SAN 구성관리 기술 등의 필요성이 제기되고 있는 실정이다. 선박에서의 모니터링 분야인 구조적 안전과 화물 관리를 위한 모니터링 외에도 선원을 포함한 모든 주변 환경을 안전하게 유지하는 것이다. 이에 본 논문에서는 기후 변화에 대한 감지나 여러 구조물에 대한 온도, 압력 등의 모니터링 시스템을 효율적으로 설계하기 위해 무선 센서 네트워크에서의 에너지 효율을 이용한 라우팅 및 데이터 병합을 위한 기술 동향을 파악하고 자기 구성 클러스터링 방법을 분석하여 선내의 무선 센서 네트워크 구성에 대해 연구하였다.

• Korean Journal of Childcare and Education
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• v.16 no.1
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• pp.75-98
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• 2020

Objective: This study aimed to examine the influences of household chaos on self-control of young children and to investigate whether teachers' limit-setting styles had moderating effects. Methods: The participants were 184 children (83 boys and 101 girls), at age 3 -5, their mothers and teachers working at daycare centers located in Seoul and Gyeonggi-do. The data were analyzed by descriptive statistics, Pearson's correlation, and hierarchical regression. Moderating effects were examined using the Mplus8.0 program. Results: The results indicated that household chaos as well as teacher's permissive and logical limit-setting styles had significant effects on self-control of preschoolers. The lower the level of household chaos was, the higher the level of self-control of preschoolers was. The level of self-control was more likely to be high when teachers used logical limit-setting with detailed explanation to children whereas it was lower when they used more permissive limit-setting. In addition, teachers' logical limit-setting moderated the relation between household chaos and self-control of preschoolers. That is, the effects of household chaos on preschoolers' self-control were mitigated when the level of logical limit-setting was high compared to when it was low. Conclusion/Implications: The results suggested that both household chaos and teachers' limit-setting styles play important roles in increasing self-control of preschoolers.

• Information Systems Review
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• v.15 no.3
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• pp.141-149
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• 2013

When evaluating effectiveness of a government's supporting program, there is a tendency to simply compare the performances of the treated before and after the program or to compare the differences in the performances of the treated and untreated before-after the program. However, these ways of evaluating effectiveness have problems because they can't account for environmental changes affecting the treated or effects coming from the differences between the treated and the untreated. Therefore, in this paper, sequential applications of PSM and DID are suggested as a means to overcome those problems. It turns out that this approach enables us to eliminate self-selection bias and thus better evaluate effectiveness.

• Journal of Digital Convergence
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• v.10 no.1
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• pp.349-355
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• 2012

Today, the computing environments is very complex, so researches that endow a system with the self-healing's ability that recognizes problem arising in a target system are being an important issues. However, the existing methodology, the goal for the new requirements for self-healing system developers to model and analyze the constraints that must be greater efforts. Therefore, in this paper are aware of problems detected by the system to solve the problem is the analysis of goal-based scenarios. In addition, there is a pre and post applying a strategy to be dynamically reconfigured to show you how to self-healing. These proposed new requirements for methodology, self-healing reduces the load on the developer's analysis.

• Journal of Educational Research in Mathematics
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• v.21 no.2
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• pp.149-163
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• 2011

While the affective aspects are emphasized in the current mathematics curriculum in Korea, it is just indicated a superficial degree. Therefore in this study, based on consideration for internal representational system theories, a dynamic viewpoints of self-system processes, socio-constructivist perspectives, and motivation theories, we discuss the meaning of affective competency, the motive of mathematics learning, mathematical identity of students, social environments and affective experiences, then we suggest an affective frame in mathematical learning. Hereby, we suggest what should be considered in affect instructions and the alternative goal of mathematical education in affective aspects.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.10
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• pp.3633-3640
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• 2010

For a development of non-contact magnet gear which is magnetized as a helical shape, a method of 3-dimensional FEM analysis is used. An elementary technique required for magnetic property analysis and parts design about magnet gear is ensured. In order to test a performance of clean conveyor and turning device which is composed with magnet gear, a clean class 10 environment booth is used for a trial test. It is verified that the magnet conveyor can be acceptable under a condition of clean class 10 by a result of trial test about transfer speed, maximum torque permission, cleanness, maximum transfer weight, existence of hunting and degree of noise.

• The KIPS Transactions:PartB
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• v.13B no.4 s.107
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• pp.421-428
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• 2006

Intelligent Tutoring System(ITS), which offers individualized learning environment that consider many learners' variable, is realized by the effective alternative to take the place of domain expert. Accordingly, research on Learning Companion System(LC) is currently noticing. However, to develop LCS which applies effective interaction, it is necessary to combine several LCs, and personalized knowledge base have to be made first. Therefore, in this paper, we propose the 'Knowledge Base Object Medel', which is based on connectionist' in cognition structure, represents learner's knowledge to self-learnig object, and grows adaptive object by proprietor, verify the validity. This model lays the groundwork for design of personalized knowledge base, offers clue to development of adaptive ITS using knowledge base object.

• Proceedings of the KAIS Fall Conference
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• 2010.11a
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• pp.325-328
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• 2010

최근의 인터넷환경은 다양한 형태의 가상 및 원격 교육이 가능한 기반을 제공하고 있으며, 대학 및 교육기관에서는 이를 활용한 새로운 교육용 도구의 개발이 활발히 이루어지고 있다. 본 논문은 시공간의 제약 없이 실험을 수행할 수 있도록 하여 학습자들에게 반복 학습이 가능하도록 하였고, 유량제어를 실현 할 수 있는 비선형 시스템의 이중탱크 기구를 이용하여 다양한 제어이론을 실험할 수 있는 웹기반 실험실을 구현하였다. 전체 시스템은 SISO 시스템과 MIMO 시스템을 학습자가 선택하여 실험할 수 있도록 하였다. 유량제어 방식은 수동, PID, FUZZY 제어로 실험할 수 있도록 하여 학습자들에게 여러 가지 제어이론을 다양하게 학습할 수 있도록 구성하였으며, 릴레이 자기 동조법을 구현하여 학습자들로 하여금 PID변수를 확인할수 있도록 하였다. 또한 Web-Cam을 통하여 실험화면을 실시간으로 확인하면서 시뮬레이션을 동시에 실행하여 비교할 수 있도록 구현하였다.

• The Journal of the Korea Contents Association
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• v.11 no.6
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• pp.279-288
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• 2011

Nursing college students' continuous clinical experiences play an important part in the development of their nursing competency. In reality, it is difficult all of students to have enough clinical experiences. We can think of simulation learning as a solution to this problem. This research attempted to develop learning contents of simulation scenario regarding pediatric nursing. We organized the contents focusing on nursing process. The application of simulation scenario showed that the educational effect. In conclusion, this research suggests that nursing college students can supply high-quality nursing services to children and their families by developing and application of simulation scenario with various cases.

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.10 no.6
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• pp.88-95
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• 1996

The ultrasonic motor(USM) has good characteristics such as compact size, silent motion, high speed responce, low speed and high torque. The USM is driven by 2-phase AC electricity. The control parameters of USM are voltage, phase, and frequency of input powers, etc. In this paper, a voltage difference control is proposed. The voltage difference control has more advantage than phase difference control. Specially, current and power is lower than that of phase difference control. For this voltage diffrence control, we designed USM controller to adjust volatage and phase using PLSI(Programmable Large Scale Integration).