• 드라이브 ㆍ 컨트롤
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• 제9권3호
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• pp.16-22
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• 2012

Nowadays, electro hydrostatic actuator (EHA) has shown great advantages over the conventional hydraulic actuators with valve control system. This paper presents a position control for an EHA using a modified back stepping controller. The controller is designed by combining a backstepping technique and adaptation laws via special Lyapunov functions. The control signal consists of an adaptive control signal to compensate for the nonlinearities and a simple robust structure to deal with a bounded disturbance. Experiments are carried out to investigate the effectiveness of the proposed controller.

• 수산해양교육연구
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• 제26권3호
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• pp.611-626
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• 2014

Based on adolescents' perspectives, this study attempts to explore the distinguishing characteristics of teachers that influence students to positively change in areas such as psychological adaptation and development of their potential. Essays focusing on memories of twenty seven significant teachers written by eighteen adolescents in middle schools and high schools in Daegu, Korea in 2011 were used for analyzing the factors that have influenced them to positively change. Subsequently, five critical factors were identified: warmness and acceptance; encouragement and support; communication and understanding; respect and care; modeling and expectation. The adolescents perceived that those factors not only contributed to their psychological wellbeing but also enabled them to positively change and achieve more in life. Moreover, the educational implications focusing on teachers' productive function and healing power were discussed. The role of teachers in reinforcing and building the character students in order to facilitate their holistic development was dealt with. Finally, the reference for promotion of further studies of the research field was made.

• The Journal of the Acoustical Society of Korea
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• 제19권3E호
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• pp.25-32
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• 2000

The main question addressed in this research was whether an adaptation of a standard exercise Physiology Procedure would be sensitive enough to record excess oxygen uptake associated with speech activity. Oxygen consumption was recorded for a single subject during 7-minute rest periods and an automatic speech task, also 7-minutes long and performed at three different vocal efforts. The data show measurable and systematic speech-induced modifications of breathing and oxygen uptake patterns. The subject was found to use less power for normal than for soft and loud speech. This result is similar to findings reported by experimental biologists on the energetics of locomotion. However, more comprehensive feasibility studies need to be undertaken on a larger population before solid and detailed conclusions about speech energy costs are possible. However, it appears clear that, for experimental tasks like the present one, i.e., variations in vocal effort, standard exercise physiology methods may indeed offer a viable approach to recording excess oxygen uptake associated with speech movements.

• 한국태양에너지학회 논문집
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• 제24권3호
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• pp.93-100
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• 2004

This study aims to presents the applicability of economic measures for renewable energy The basic principle and method of economic analyses were investigated and total life cycle cost considering environmental costs according to $CO_2$ generation. In case study, adaptation of new small wind power system to buildings were proved to produce a profit if it is considered the environmental cost and increment of energy prices. And so the economic measures can be used not only for the investment decisions for economic analysis but also for the comparative analysis of environmental cost and economic profits.

• 기본간호학회지
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• 제20권1호
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• pp.6-17
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• 2013

Purpose: The purpose of this study was propose and test a predictive model that could explain and predict factors influencing the sexual satisfaction of women with diabetes mellitus. Method: The conceptual frame for this study was formed as a hypothesized model based on Roy's adaptation model. Participants for this study were 240 out-patient women from P university hospital in Y city. The data were analyzed using SPSS 18.0 and AMOS 19.0 program. Results: The paths that had direct effects on sexual satisfaction, and were statistically significant were showing intimacy with spouse, and sexual function. The explanatory power of these variables for sexual satisfaction was 64%. Conclusion: The results of the study suggest that it is necessary for enhancement of sexual satisfaction for women with diabetes to increase intimacy with husband, and that sexual function, frequency of exercise, adequate glycemic control be maintained, and depression decreased.

• 대한안전경영과학회지
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• 제3권4호
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• pp.19-34
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• 2001

Since the introduction of product liability law from America in 1960s, product liability has been on the rise as an important problem to the quality management of company and consumer's safety. Together with this, before the legislation of product liability system in Korea, the sense and level of company and consumer about product safety are rapidly changing, In times like the present, ensuring more systematic product safety and consumer safety, and the buildup need of competitive power in accordance with product liability prevention of company grows raising. Therefore, this study presents the most effectively manageable ways of product liability the side of safety management of consumers and companies through the ensuring ways and activity models of product safety and certification system in company.

• ETRI Journal
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• 제45권5호
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• pp.811-821
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• 2023

We propose an adaptive unmanned aerial vehicle (UAV)-assisted object recognition algorithm for urban surveillance scenarios. For UAV-assisted surveillance, UAVs are equipped with learning-based object recognition models and can collect surveillance image data. However, owing to the limitations of UAVs regarding power and computational resources, adaptive control must be performed accordingly. Therefore, we introduce a self-adaptive control strategy to maximize the time-averaged recognition performance subject to stability through a formulation based on Lyapunov optimization. Results from performance evaluations on real-world data demonstrate that the proposed algorithm achieves the desired performance improvements.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2024년도 춘계학술발표대회
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• pp.167-168
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• 2024

본 연구에서는 물리계층 보안을 위한 키 길이를 IoT 무선 채널 상태에 따라 조정하는 링크 적응 방법을 제안한다. 시뮬레이션 결과에 따르면 제안 방식은 종래 방식 대비 평균 78.52% 개선된 처리율과 약 2배 개선된 보안성을 보인다.

• 산업융합연구
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• 제18권4호
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• pp.77-86
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• 2020

본 연구는 간호대생의 비판적 사고성향, 임상실습 스트레스, 핵심기본간호술 자신감, 임상실습 적응 정도를 파악하는 서술적 조사연구이다. 2019년 6월부터 7월까지 간호대학생 4학년 207명에게 자가설문지를 통해 조사하였다. 수집된 자료는 SPSS/WIN v24.0을 이용하여 t-test, ANOVA와 다중회귀분석을 시행하여 분석하였다. 임상실습 스트레스와 비판적 사고성향은 음의 상관관계(r=-.18, p=.010)로 나타났다. 핵심기본간호술 수행자신감은 비판적 사고성향과 양의 상관관계(r=.25, p<.001), 임상실습 스트레스와 음의 상관관계(r=-.17, p=.017)를 나타냈다. 임상실습 스트레스는 임상실습 적응과 양의 상관관계(r=.44, p<.001)를 보였고, 임상실습 적응에 가장 큰 영향을 미치는 요인(β=.43)으로 나타났으며(F=18.34, p<.001), 설명력은 약 23.1%였다. 이상과 같이 임상실습 스트레스는 임상실습 적응에 영향을 미치는 요인으로, 간호대학생의 임상실습에서 받는 스트레스 요인들을 파악하고 교육과정 개발에 반영할 필요가 있다.

• 디지털융복합연구
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• 제15권6호
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• pp.315-327
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• 2017

본 연구는 보건계열 일부 대학생의 토익학습에서 학업소진과 관련된 융복합적 요인들을 조사하고자 수행하였다. 조사대상은 J지역에 소재한 대학의 보건계열 토익학습반에서 임의로 선정된 재학생 291명으로 하였으며, 자료수집은 2017년 4월 3일부터 4월 14일까지 기간에 무기명 자기기입식 설문지를 통해 이루어졌다. 다중회귀분석 결과, 여학생이, 수면시간이 부적절할수록, 자아존중감, 자기효능감, 학교적응유연성 및 학습몰입이 낮을수록, 자기유능감, 취업스트레스 및 시험불안이 높을수록 토익학습의 학업소진이 높았으며 이들의 설명력은 65%이었다. 이상의 연구결과를 볼 때, 보건계열 대학생의 토익학습의 학업소진을 낮추기 위해서는 적절히 수면하고, 자아존중감, 자기효능감, 학교적응유연성 및 학습몰입을 높이고 자기유능감, 취업스트레스 및 시험불안을 관리하는 노력이 필요하다. 이러한 결과는 보건계열 대학생의 토익학습의 학업소진을 낮추어 국제화 역량을 키우기 위한 영어 학습 능률을 높이는 데 활용이 기대된다. 향후연구에서는 이들 요인들이 학업소진에 미치는 조절 및 매개효과에 대한 융복합적인 영향 분석이 필요하다.