• 대한간호학회지
• /
• 제42권7호
• /
• pp.1050-1061
• /
• 2012

Purpose: The purpose of this study was to identify the effects of mothers' involvement in a dental health program for their elementary school children. Methods: This study was a non-equivalent control group pre-post test design in which knowledge and behaviors related to dental health, perceived benefits and barriers, self-efficacy and plaque control scores were compared between the experimental group (n=26) for whom the dental health program included the direct involvement of the mothers, and the control group (n=24) for whom knowledge related to dental health was provided through brochures. Results: Scores for the experimental group in which the mothers were involved in the dental health program were significantly higher for knowledge, behaviors in dental health, self-efficacy and plaque control compared to the control group. Conclusion: Results of this study suggest that mothers involvement in the dental health program is effective in reinforcing dental health enhancing behavior in elementary school children.

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 1993년도 한국자동제어학술회의논문집(국제학술편); Seoul National University, Seoul; 20-22 Oct. 1993
• /
• pp.558-561
• /
• 1993

The main difference between a linear system and a nonlinear system is the existence of direct interactions between input signals. These interactions will be classified into three types, (1) self-interaction among different order terms of control signals, (2) static mutual interactions between the control signals, and (3) dynamic interactions through the coefficient venctor fields of the control variables. In this paper, we will show that interactions of type (2) and (3) can be avoided by applying an appropriate dynamic compensator, while the interaction of type (1) is fatal.

• 한국자기학회지
• /
• 제27권1호
• /
• pp.9-17
• /
• 2017

다상 전동기는 기존의 3상 전동기와 비교하여 높은 신뢰성과 성능의 이점 때문에 고 신뢰성을 요하는 전장과 특수기기 분야에서 많은 관심을 갖고 있다. 본 연구에서는 다상 전동기들 중 5상 영구자석 동기 전동기를 이용하여 전동기 제어의 주요 변수인 자기 인덕턴스와 상호 인덕턴스를 수식을 통한 추정 방법을 다룬다. 최근 대부분의 고효율 구동 전동기들은 FOC(Field Orinted Control)와 DTC(Direct Torque Control) 제어를 이용하므로 전압 방정식에서 가장 중요한 인덕턴스를 정확하게 추정하는 것이 중요하다. 인덕턴스를 수식적으로 계산하기 위해서 본 연구에서는 WFT(Winding Function Theory)를 적용하였다. 계산된 인덕턴스의 결과 값의 타당성 유무를 확인하기 위하여 유한요소해석과 비교 하였으며 약 3%의 편차를 가지는 것을 확인하였다. 최종적으로 WFT를 이용하여 계산된 인덕턴스를 FOC와 DTC 제어에 필요한 값인 d축과 q축 인덕턴스로 변환하는 과정을 소개한다.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2004년도 하계종합학술대회 논문집(1)
• /
• pp.281-284
• /
• 2004

This paper presents the design and implementation of a QoS based enhanced collaboration system in MDO. This is an efficient distributed communication tool between designers. It supports text communication, audio/video communication, file transfer and XML data sending/receiving. Specially, this system supports a dynamic QoS self-adaptation by using the improved direct adjustment algorithm (DAA+). The original direct adjustment algorithm adjusts the transmission rate according to the congestion level of the network, based on the end to end real time transport protocol (RTP), and controls the transmission rate by using the information of loss ratio in real time transport control protocol (RTCP). But the direct adjustment algorithm does not consider when the RTCP packets are lost. We suggest an improved direct adjustment algorithm to solve this problem. We apply our improved direct adjustment algorithm to our of QoS (Quality of Service) [1] based collaboration system and show the improved performance of transmission rate and loss ratio.

• 한국산학기술학회논문지
• /
• 제21권2호
• /
• pp.479-494
• /
• 2020

본 연구는 청소년의 스마트폰 과다사용과 학교적응간의 구조적 관계를 살펴봄으로써 청소년의 건전한 스마트폰 이용에 유용한 시사점을 제공하고자 하였다. 연구목적을 달성하기 위해 B지역에 위치한 초·중·고등학생들 중 스마트폰을 사용하고 있는 학생 900명을 대상으로 2014년 9월부터 10월까지 설문조사를 실시하였다. 설문은 총 891부가 수거되었고 불성실하게 응답한 설문 25부를 제외한 866부를 분석에 활용하였다. 통계분석 프로그램으로는 SPSS 20.0과 Amos 18.0을 활용하였으며 연구가설을 검증하기 위하여 구조방정식모형을 적용하였다. 분석결과는 다음과 같다. 첫째, 스마트폰 과다사용과 학교적응의 관계는 유의하지 않았다. 둘째, 스마트폰 과다사용과 사회적 지지의 관계는 유의한 영향력이 있는 것으로 나타났다. 셋째, 스마트폰 과다사용과 자기통제력의 관계에서도 유의한 영향력이 있는 것으로 나타났다. 넷째, 청소년의 사회적 지지와 자기통제력 모두 학교적응에 직접적인 영향을 미치는 것으로 나타났다. 다섯째, 스마트폰 과다사용과 학교적응의 관계에서 사회적지지 및 자기통제력은 매개효과가 있는 것으로 나타났다. 따라서 청소년들의 학교적응력을 높이기 위해서는 자기통제력을 확대시키고, 가족관계의 친밀성과 상호지지를 확장하면서 사회적 지지체계를 확고히 하는 노력이 필요하다.

• 한국콘텐츠학회논문지
• /
• 제22권9호
• /
• pp.401-411
• /
• 2022

이 연구는 낮은 자기통제력이 스마트폰 이용상의 사이버범죄에 미치는 영향에서 그 매개과정이 어떠한지의 연구모형을 구성함에 있어 낮은 자기통제력이 스마트폰중독에 영향을 주고 아울러 스마트폰중독이 사회학습과정과 범죄기회의 증가를 가져와 사이버범죄에 영향을 미친다는 연구모형을 구성하고 검증했다. 서울시 대학생 대상의 조사자료의 분석결과 낮은 자기통제력은 스마트폰중독에 유의미한 영향력을 가졌다. 그리고 스마트 폰사용에 중독될수록 불법친구와 접촉할 가능성이 높았고, 불법태도를 학습하며, 또한 불법기회에 노출되어 사이버범죄 가능성이 높은 것으로 나타났다. 또한 낮은 자기통제력은 스마트폰중독의 매개없이도 직접적으로 학습 및 기회요인에 유의미한 영향력을 가져 불법친구와 불법태도에, 그리고 불법기회에 유의미한 영향력을 가졌고 최종 매개변인으로 사회학습 및 기회요인이 사이버범죄에 크게 영향을 미쳤다. 이러한 결과에서 처럼 낮은 자기통제력은 스마트폰중독을 통해 그리고 학습 및 기회요인을 매개로 사이버범죄에 영향을 미치는 것을 제시했다.

• Journal of Mechanical Science and Technology
• /
• 제14권10호
• /
• pp.1081-1088
• /
• 2000

In this paper, a compliance control strategy for robot manipulators that employs a self-adjusting stiffiness function is proposed. Based on the contact force, each entry of the diagonal stiffness matrix corresponding to a task coordinate in the operational space is adaptively adjusted during contact along the corresponding axis. The proposed method can be used for both the unconstrained and constrained motions without any switching mechanism which often causes undesirable instability and/or vibrational motion of the end-effector. The experimental results involving a two-link direct drive manipulator interacting with an unknown environment demonstrates the effectiveness of the proposed method.

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 1990년도 한국자동제어학술회의논문집(국내학술편); KOEX, Seoul; 26-27 Oct. 1990
• /
• pp.186-189
• /
• 1990

The automization of manufacturing lines may be accomplished by replacing the human operator with computer system. This paper describes an idea to fully automize the razor qrinding process. Now, in this system, to control the process, human operator must estimate the qrinded states and control the grinding machine continuously. We propose two methods to automize this process by using CMAC memory. One is about learning expert-rules without direct communication with operator. And the other is complete self-learning method based on CMAC's learning algorithm. These ideas may be applied for another manufacturing processes.

• 한국치위생학회지
• /
• 제16권4호
• /
• pp.567-575
• /
• 2016

Objectives: The purpose of the study was to investigate dental care effects of periodontal diseases patients with systemic diseases. Methods: The study subjects were ten patients. The study consisted of direct examination and interview survey. Direct examination comprised pocket depth, bleeding on the brush, O'Leary plaque record, salivary flow rate, and oral bacterial culture for three months. Results: The number of diabetic patients was eight. Four patients xerostomia and one of them had 0.7 mL per minute of salivary flow rate, decreased O'Leary plaque record, and bleeding in the brush. Those who received education were able to take control of plaque management. They recognized the need for oral care and had good self-management of oral care skills. Conclusions: The professional dental care and oral health education improved periodontal health and self-management skills of plaque in periodontal disease patients with systemic diseases.

• 지역사회간호학회지
• /
• 제11권2호
• /
• pp.333-346
• /
• 2000

The purpose of this study was designed to test and develope the structural model that explains health promoting behaviors among college students in Korea. The hypothetical model was constructed on the Pender's Health promotion Model(l996) and the inclusion of some influential factors for life satisfaction. The conceptual framework was built around eight constructs. Exogenous variables included in the model were self-esteem, perceived health status, self-efficacy, internal locus of control, chance locus of control. powerful other locus of control. Endogenous variables were health promotion behaviors and life satisfaction. The results are as follows; 1. The overall fit of the hypothetical model to the data was moderate <$x^2$=4.18(df=11. p=0.041), GFI= 0.99, AGFI= 0.76, RMR= 0.019, CFI= 0.99, CN= 248.50> 2. Path and variable of the model were modified by considering both its theoretical implication and statistical significance of parameter estimates. Compared to the hypothetical model. the revised model has become parsimonious and had a better fit to the data expected in a chi-square value <$x^2$=8.43( df= 16, p=0.21), GFI= 0.99, AGFI= 0.92., RMR= 0.024, CFI= 0.99, CN= 312.01> 3. Some of the predictive factors. especially self efficacy. self esteem. powerful others locus of control. perceived health status revealed the direct effects on health promoting behaviors. Of these variables. self-efficacy was the most signigicant factor. These predictive variables of health promoting behaviors explained 59% of total variances in the model. 4. Health promoting behaviors, self-esteem. and perceived health status revealed direct effect on the life satisfaction. Self-efficacy was identified as an important variable that contributed indirectly to improve life satisfaction by enhancing health promoting behaviors. These predictive variables of life satisfaction explained 42% of total variances in the model. In conclusion. the derived model in this study is considered appropriate in explaining and predicting health promoting models and life satisfaction among college students in Korea and could effectively be used as a reference model for further studies by suggesting a direction in health promoting nursing practices.