• Title/Summary/Keyword: path-coefficients

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Exploring Psycho-social Determinants to Child Neglect and Abuse among Caregivers with Young Children (영유아를 돌보는 양육자의 방임 및 학대에 영향을 미치는 심리 사회적 요인 탐색)

  • Kim, Ah Rim;Tak, Young Ran
    • Research in Community and Public Health Nursing
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    • v.27 no.1
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    • pp.81-94
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    • 2016
  • Purpose: The objective of this study was to investigate the relations among psycho-social factors regarding child neglect and abuse using the data from the 2013 Korea National Survey on Children and Youth. Methods: Data from a sample of 1,062 primary caregivers with young children were analyzed with the SPSS and AMOS programs to examine the interrelationships among depression, parenting stress, marital satisfaction, parent-child attachment, and child neglect or maltreatment. Results: Depression, stress, and attachment had a direct influence on child neglect and abuse. Satisfaction with marital relationship, parenting stress, and attachment were found to play mediating roles in accounting for child neglect and abuse, explaining 12% of the variance. The results of multi group path analysis showed that some coefficients were different according to the age group of the children. For caregivers with infants, parenting stress did not predict either attachment or child maltreatment, whereas for caregivers with toddlers, depression did not have a significant effect on attachment. Conclusion: In order to prevent child maltreatment, efforts should be made to develop community-based psycho-social support interventions focused on marital relationship as well as parent-child dyads and to provide practical child care support.

Experimental Study on Consolidation Characteristics of Soft Marine Deposit by Piezocone Dissipation Test (피에조콘 소산시험을 통한 해성연악지반의 압밀특성에 대한 실험적 연구)

  • 박찬국;송정락;김수일
    • Journal of the Korean Geotechnical Society
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    • v.18 no.2
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    • pp.137-146
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    • 2002
  • Field piezocone dissipation tests are performed, and the results are compared to the Rowe cell consolidation tests results to investigate the consolidation characteristics of soft marine deposit at the same location in Korea. From these results, statistical formula fur the relation between the coefficients of horizontal consolidation$(c_r)$ from Rowe cell consolidation tests and $t_{50}$ from pore pressure dissipation tests by Piezocone is suggested through the regression analysis. The results are also compared to the existing theoretical formula. It is also shown that suggested formula is similar to Torstensson's(1977) formula based on cylindrical cavity expansion theory and Houlsby and Teh's(1988) formula based on strain path method.

Analysis of Causal Relationship among Performance Factors of Quality Management in Korean Public Enterprises : Using Malcolm Baldrige Non-profit Criteria (공기업 품질경영 성과요인간의 인과관계 분석에 관한 연구: 제조분야 및 의료분야와의 비교를 중심으로)

  • Moon, Jae-Young;Lee, Sang-Chul;Lee, Dong-Ki;Suh, Young-Ho
    • Journal of Korean Society for Quality Management
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    • v.37 no.1
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    • pp.10-19
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    • 2009
  • The objective of this study is to analyze the causal relationship among Non-profit Criteria of the Malcolm Baldrige National Quality Award(MBNQA) and to compare the casuality among company, hospital and non-profit organization field. The survey instrument consists of 94 questions from the seven categories of the MBNQA. Structural Equation Modeling (SEM) is used to analyze the empirical data and estimates the path coefficients among the MBNQA categories. The result of our research is as follows, First, the Leadership effects on as a driver of all factors. Secondly, the positive effect of the Foundation on the Direction and the System categories, Finally, the positive influence of the Direction on the System categories of the MBNQA model. In this study, most hypothesis are statistically significant.

Theory of Acoustic Propagation in 3 Dimensional Wedge Domain (3차원 쐐기형 영역에서의 음향파 전달 이론)

  • Seong, Woo-Jae
    • The Journal of the Acoustical Society of Korea
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    • v.13 no.2E
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    • pp.83-91
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    • 1994
  • Three components contribute to the acoustic field propagating in a wedge or over a ridge : a direct path arrival, an image component due to reflection from the boundaries and a component diffracted by the apex. All three contributions are included in a new, exact solution of the Helmholtz equation for the three-dimensional time harmonic field from a point source in a wedge(or over a ridge) formed by two intersecting, pressure-release plane boundaries. The solution is obtained by applying three integral transforms, and consists of and infinite sum of uncoupled normal nodes. The mode coefficients are given by a finite integral involving a Gegenbauer polynomial in the integrand, which may be computed relatively efficiently. Results of the theory for propagation over a 90 degree ridge is discussed.

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The Pathways from Attachment to Children's Psychological Well-being : The Mediating Effects of Children's Ego-resilience and Peer Support (애착이 아동의 심리적 안녕감에 미치는 영향 : 자아탄력성과 친구지지의 매개 역할)

  • Ahn, Jee-Young;Oh, Mi-Kyoung;Kim, Ji-Shin
    • Korean Journal of Child Studies
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    • v.32 no.6
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    • pp.63-79
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    • 2011
  • The aim of this study is to examine the pathways from attachment to children's psychological well-being in addition to the mediating role of children's ego-resilience and peer support. The participants, 297 fifth and sixth grade students from Seoul and other cities, completed questionnaires on attachment, ego-resilience, peer support and psychological well-being. Data were analyzed by mean, standard deviation, Pearson's correlation coefficients, factor analysis, and path analysis. The findings are as follows. Attachment didn't appear to directly influence children's psychological well-being, but showed a number of indirect effects in two ways. First, attachment indirectly affected children's psychological well-being by ego-resilience as a simple form of mediation. Second, attachment influenced children's psychological well-being through children's ego-resilience and peer support as a dual mediation. Ego-resilience demonstrated the strongest effect on psychological well-being among all the factors examined. These results highlight the way in which children's personal internal resources play an important role in the pathways from attachment to their psychological well-being.

Autopilot Design of an Autonomous Underwater Vehicle Using Robust Control

  • Jung, Keum-Young;Kim, In-Soo;Yang, Seung-Yun;Lee, Man-Hyung
    • Transactions on Control, Automation and Systems Engineering
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    • v.4 no.4
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    • pp.264-269
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    • 2002
  • In this paper, Η$_{\infty}$ depth and course controller of an AUV(Autonomous Underwater Vehicle) using Η$_{\infty}$ servo control is proposed. The Η$_{\infty}$ servo problem is formulated to design the controllers satisfying a robust tracking property with modeling errors and disturbances. The solution of the Η$_{\infty}$ servo problem is as fellows: first, this problem is modified as an Η$_{\infty}$ control problem for the generalized plant that includes a reference input mode, and then a sub-optimal solution that satisfies a given performance criteria is calculated by LMI(Linear Matrix Inequality) approach. The Η$_{\infty}$ depth and course controller are designed to satisfy with the robust stability about the modeling error generated from the perturbation of the hydrodynamic coefficients and the robust tracking property under disturbances(wave force, wave moment, tide). The performances of the designed controllers are evaluated with computer simulations, and finally these simulation results show the usefulness and application of the proposed Η$_{\infty}$ depth and course control system.

Success Factors for Web-based Agricultural Information Systems (웹기반 농업정보시스템 성공요인에 관한 연구)

  • Yoo, Chul-Woo;Park, Soo-Min;Choe, Young-Chan;Shim, Gun-Seop
    • Journal of Korean Society of Rural Planning
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    • v.15 no.4
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    • pp.59-74
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    • 2009
  • This study reviews and modifies general IS success models to find success factors of WIS(Web-based Information Systems) and to confirm the relationship between WIS success and user's satisfaction of web use. A WISSM(Web-based Information Success Model extended to include EQ(E-Quality) is developed to anticipate user's intention to use Web-based Agricultural Information System and fit into the survey data from 252 WIS users of RDA(Rural Development Administration). PLS is applied to estimate a structural model based on EQ-WISSM to test hypotheses including 1) users reach a high level of intention to use Web-based Information Systems when they feel a high level of interactivity among an 'E-Quality', 'Decision Making Support Satisfaction' and 'Task Support Satisfaction', and E-Quality boosts intention to use Web-based Information Systems. The results show high path coefficients and $R^2$ values and find followings; First, the EQ-WISSM explains the user's intention to use WAIS quite well. Second, E-Quality can be used well in web-based IS environment to predict IS Success. Finally, this research finds the importance of 'Task Support Satisfaction' as a mediator between 'Decision Making Support Satisfaction', 'E-Quality' and 'Intention to Use'.

A New Method of Estimating the Buried Location and Extracting Approximate image of Underground Structures using Ground Penetrating Radar (지하 탐사용 레이다를 이용한 지하 구조물의 위치 파악법 및 근사 이미지 추출법)

  • 김동호;이승학;김채영
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.11 no.4
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    • pp.565-574
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    • 2000
  • A new ground penetrating radar imaging method for the estimation of buried artificial structures location and their approximate shapes in dispersive lossy ground is investigated. Fundamental idea is based on estimating delayed time and amplitude retrieval coefficients from scattered signals by buried scatterers. Using absolute value integration of each scanning site not only improve the accuracy of measured scattered signal, but also offers convenient ways to extract the image of buried structures. Multi-term Debye model was employed to describe a dispersive and lossy ground medium. We used the finite difference time domain method to discretize the wave equation in continuous form into the machine suitable form. This imaging method uses a new wave path tracing technique in time domain, which is helpful to identify the exact position of buried structures against the ground surface fluctuations.

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Dynamic Characteristics of the Radial Clearance Flow between Axially Oscillating Rotational Disk and Stationary Disk

  • Horiguchi, Hironori;Ueno, Yoshinori;Takahashi, Koutaro;Miyagawa, Kazuyoshi;Tsujimoto, Yoshinobu
    • International Journal of Fluid Machinery and Systems
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    • v.2 no.2
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    • pp.147-155
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    • 2009
  • Dynamic characteristics of the clearance flow between an axially oscillating rotational disk and a stationary disk were examined by experiments and computations based on a bulk flow model. In the case without pressure fluctuations at the inlet and outlet of the clearance, parallel and contracting flow paths had an effect to stabilize the axial oscillation of the rotating disk. The enlarged flow path had an effect to destabilize the axial oscillation due to the negative damping and stiffness for outward and inward flows, respectively. It was shown that the fluid force can be decomposed into the component caused by the inlet or outlet pressure fluctuation without the axial oscillation and that due to the axial oscillation without the inlet or outlet pressure fluctuation. A method to predict the stiffness and damping coefficients is proposed for general cases when the device is combined with an arbitrary flow system.

High resolution heterodyne interferometric technique with AOM for measuring the thermal expansion (음향광변조기를 이용한 고분해능의 헤테로다인 간섭식 열팽창 측정기술)

  • 최병일;이상현;김종철;임동건
    • Korean Journal of Optics and Photonics
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    • v.13 no.6
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    • pp.530-536
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    • 2002
  • The accurate measurements of thermal expansion coefficients is one of the most important techniques required not only in material science but also in industries. A high precision interferometric dilatometer, using acoustic optical modulator, has been constructed and its performance has been tested. The system consists of a double-path optical heterodyne interferometer and a radiant heating furnace. This provides highly accurate length measurement, and allows rapid heating and cooling method for the specimen. A three longitudinal mode frequency stabilized He-Ne laser, using the secondary beat frequency, is constructed. Its stability is found to be $5{\times}10^{-9}$. The uncertainty in the length measurement is estimated to be of nanometer order in the range between room temperature to 1100 K.