• The Journal of Korean Physical Therapy
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• 제21권2호
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• pp.55-63
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• 2009

Purpose: This study evaluated of quality of life (QOL) and physical therapy satisfaction (PTS) in caregivers of cerebral palsy children. Methods: Eighty six caregivers in Gwang-ju were examined. The caregivers' QOL was assessed through self-reports using the WHO Quality of Life-BREF (WHOQOL-BREF), and the data was analyzed separately for each of its 5 domains. Physical therapy satisfaction was assessed using a self-reported questionnaire and the data was analyzed separately for the 2 domains. The results were processed by the mean and standard deviation and then verified by ANOVA and a t-test to determine the significant differences in the QOL and PTS. The factors affecting the QOL were processed by logistic regression. Results: Life environment domain of the QOL across the caregivers factors showed a statistically significant difference in age at natal, monthly income and education. The birth order in the cerebral palsy child factor showed a significant difference in the general, physical and emotional domain of the QOL. The PTS showed a significant difference in the delivery of therapy domain and in the birth order and walking condition of the environment domain. Caregivers education was found to be associated independently with the life environment domain of QOL. Conclusion: Because the QOL of caregivers is an important treatment goal for children with cerebral palsy, early family intervention should be considered.

• 정보처리학회논문지:컴퓨터 및 통신 시스템
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• 제1권1호
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• pp.55-60
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• 2012

최근 봇넷(Botnet)은 탐지 기술을 피하기 위하여 C&C(Command and Control)서버 접속시 DNS(Domain Name System) 서비스를 이용하고 있다. DNS 서비스를 이용한 비정상 행위에 대응하기 위해서 DNS 트래픽 기반의 분석 연구가 필요하다. 본 논문에서는 좀비PC의 C&C서버 도메인주소 질의와 같은 DNS트래픽 기반의 비정상 도메인 분류(Classification)를 위해서 DNS트래픽 수집 및 지도학습(Supervised Learning)에 대해 연구한다. 특히, 본 논문에서는 PCA(Principal Component Analysis) 주성분분석 기술을 통해 DNS 기반의 분류시스템에서의 효과적인 분석 성분들을 구성할 수 있다.

• 영어어문교육
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• 제17권1호
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• pp.37-52
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• 2011

The purposes of this study were to review developmental stages of acculturation, to establish dimensions and components of intercultural communicative competence, and to suggest teaching methods in the elementary school based on the dimensions and the components of the stages. In order to achieve these purposes, theoretical research on the nature of intercultural communicative competence and teaching methods of intercultural dimensions and components was carried out in terms of developmental stages of acculturation. The stages of acculturation have relation to cognitive domain, affective domain, and cultural awareness. In the domain of cognitive development, the models such as Cummins (1981), Wong-Fillmore (1983), and Ausubel (1968) were presented. In the affective domain of second language research, the models of Gardener and Lambert (1972), Maslow (1954), and Bloom (1974) were argued. Modifying the models of Ausubel, Cummins, Wong-Fillmore, the dimensions and components of intercultural communicative competence were established. In addition, it was suggested that cultural syllabus and lesson plan based on tourist and survivor stage should be considered.

• Interaction and multiscale mechanics
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• 제2권1호
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• pp.91-107
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• 2009

In order to accurately estimate the seismic behavior of buildings, it is important to consider both nonlinear characteristics of the buildings and the frequency dependency of the soil impedance. Therefore, transform methods of the soil impedance in the frequency domain to the impulse response in the time domain are needed because the nonlinear analysis can not be carried out in the frequency domain. The author has proposed practical transform methods. In this paper, seismic response analyses considering frequency dependent soil impedance in the time domain are shown. First, the formulation of the proposed transform methods is described. Then, the linear and nonlinear earthquake response analyses of a building on 2-layered soil were carried out using the transformed impulse responses. Through these analyses, the validity and efficiency of the methods were confirmed.

• 한국정밀공학회지
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• 제18권11호
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• pp.58-66
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• 2001

GPC has been reported as a useful self-tuning control algorithm for systems with unknown time-delay and parameters. GPC is easy to understand and implement, and thus has won popularity among many practicing engineers. Despite its success, GPC does not guarantee is nominal stability. So, in this paper, GPC is rederived in frequency domain instead of in the time domain to guarantee its nominal stability. Derivation of GPC in frequency domain involves spectral factorization and Diophantine equation. Frequency domain GPC control law is stable because the zeros of characteristic polynomial are strictly Schur. Recursive least square algorithm is used to identify unknown parameters. To see the effectiveness of the proposed controller, the controller is simulated for a numerical problem that changes in dead-time, in order and in parameters.

• Journal of the Korean Society for Industrial and Applied Mathematics
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• 제24권2호
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• pp.161-197
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• 2020

Total variation minimization is standard in mathematical imaging and there have been numerous researches over the last decades. In order to process large-scale images in real-time, it is essential to design parallel algorithms that utilize distributed memory computers efficiently. The aim of this paper is to illustrate recent advances of domain decomposition methods for total variation minimization as parallel algorithms. Domain decomposition methods are suitable for parallel computation since they solve a large-scale problem by dividing it into smaller problems and treating them in parallel, and they already have been widely used in structural mechanics. Differently from problems arising in structural mechanics, energy functionals of total variation minimization problems are in general nonlinear, nonsmooth, and nonseparable. Hence, designing efficient domain decomposition methods for total variation minimization is a quite challenging issue. We describe various existing approaches on domain decomposition methods for total variation minimization in a unified view. We address how the direction of research on the subject has changed over the past few years, and suggest several interesting topics for further research.

• 전기학회논문지
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• 제60권3호
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• pp.612-619
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• 2011

Satellite navigation system such as GPS is becoming more important infrastructure for positioning, navigation and timing. But satellite navigation system is vulnerable to interferences because of the low received power, complementary navigation system such as eLoran is needed. In order to develop eLoran/GPS navigation system, integrated eLoran/GPS navigation algorithm is necessary. In this paper, new integrated eLoran/GPS navigation algorithm is proposed. It combines the position domain integration and the range domain integration to get accurate position with less computational burden. Also an eLoran/GPS evaluation platform is designed and performance evaluation of the proposed algorithm using the evaluation platform is given. The proposed algorithm gives an accuracy of the range domain integration with a computational load of the position domain integration.

• 한국지능시스템학회논문지
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• 제14권3호
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• pp.363-368
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• 2004

In this paper, the robustness property of 2nd-order iterative learning control(ILC) method for a class of linear and nonlinear discrete-time dynamic systems is studied. 2nd-order ILC method has the PD-type learning algorithm based on both time-domain performance and iteration-domain performance. It is proved that the 2nd-order ILC method has robustness in the presence of state disturbances, measurement noise and initial state error. In the absence of state disturbances, measurement noise and initialization error, the convergence of the 2nd-order ILC algorithm is guaranteed. A numerical example is given to show the robustness and convergence property according to the learning parameters.

• 실천공학교육논문지
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• 제12권2호
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• pp.363-369
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• 2020

이 연구는 청소년 대상 파이썬 활용 교육의 효과를 메타분석을 통해 정리하는 것을 목적으로 한다. 자료 분석을 위해 파이썬 활용 교육의 효과를 보고한 선행연구 6편을 선정하였다. 연구 결과를 정리하면 다음과 같다. 첫째, 파이썬 활용 교육의 전체 효과크기는 0.684로 나타났다. 둘째, 교육 효과를 종속변수 유형에 따라 비교 분석한 결과, 학업성취도 0.871, 인지적 영역 0.625, 정의적 영역 0.428로 나타났다. 셋째, 인지적 영역의 경우, 자기효능감 0.833, 문제해결능력 0.283, 컴퓨팅사고력 0.276, 코딩 역량 0.251의 순서로 나타났다. 넷째, 정의적 영역의 경우, 학습 흥미 0.56, 프로그래밍 흥미 0.417의 순서로 나타났다. 다섯째, 학교 급의 경우, 중학교 0.851, 고등학교 0.585, 대학교 0.435의 순서로 나타났다. 여섯째, 교과 영역의 경우, 수학 1.057, 디자인 0.595, 정보 0.585, 소프트웨어 0.28의 순서로 나타났다.

• BMB Reports
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• 제35권3호
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• pp.343-347
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• 2002

The human protein tyrosine kinase-6 (PTK6) polypeptide that is deduced from the cDNA sequence contains a Src homology (SH) 3 domain, SH2 domain, and catalytic domain of tyrosine kinase. We initiated biochemical and NMR characterization of PTK6 SH3 domain in order to correlate the structural role of the PTK6 using circular dichroism and heteronuclear NMR techniques. The circular dichroism data suggested that the secondary structural elements of the SH3 domain are mainly composed of $\beta$-sheet conformations. It is most stable when the pH is neutral based on the pH titration data. In addition, a number of cross peaks at the low-field area of the proton chemical shift of the NMR spectra indicated that the PTK6 SH3 domain retains a unique and folded conformation at the neutral pH condition. For other pH conditions, the SH3 domain became unstable and aggregated during NMR measurements, indicating that the structural stability is very sensitive to pH environments. Both the NMR and circular dichroism data indicate that the PTK6 SH3 domain experiences a conformational instability, even in an aqueous solution.