• Imaging Science in Dentistry
• /
• 제35권2호
• /
• pp.69-75
• /
• 2005

Purpose : To determine the clinical correlation of magnetic resonance imaging (MRI) findings of temporomandibular joint internal derangements. Materials and Methods : The MR images of 150 TMJs in 75 patients were analyzed. The clinical symptoms were pain in the preauricular area and masticatory muscles and TMJ sounds. Results : There was a statistically significant relationship between the MRI diagnoses of different types of disc displacements and clinical findings of pain, clicking, and crepitus. The risk of TMJ pain was increased when the disc displacement without reduction occurred at the same time in combination with the osteoarthrosis and effusion. Conclusion : Regardless of the results, the data indicate that each of these MR imaging variables may not be regarded as the unique and dominant factor in defining TMJ pain occurrence.

• 콘크리트학회논문집
• /
• 제11권3호
• /
• pp.193-203
• /
• 1999

The corrosion of steel reinforcements in concrete is of great concern in recent years. This study is focused on the corrosion behavior of steel bars induced by internal chlorides in concrete at early ages. The main objective of this study is to determine the chloride thresholds causing depassivation and active corrosion of steel reinforcement in concrete. To examine the threshold concentration of chloride ion, the half-cell potential, chemical composition of expressed pore solutions of concrete and the rate of corosion area of the specimens were measured. Major variables include the added amount of chlorides in concrete, types of binders, and water-to-binder ration. From the present comprehensive experimental results, the factors influencing chloride-induced corrosion are investigated, and the chloride thresholds causing active corrosion of steel bars are proposed. The present study will enable to specify the realistic chloride limit in concrete which can be used in the future technical specification.

• 대한가정학회지
• /
• 제35권5호
• /
• pp.163-175
• /
• 1997

This study investigated the relationship between mother's verbal control modes and children's social competency, the relationship between mother's verbal control modes and children's internal-external control, and the relationship between children's internal-external control and children's social competency. The subjects of this study were 157 boys and 144 girls attending elementary schools and their mothers in Busan. Lee's(1993) questionnaire on mother's verbal control modes, the modified version of Nowicki and Strickland's CN-SIE on internal-external control and Choi's(1992) questionnaire on social competence were used. The results were as follows: 1) The mothers control their children mostly by position-oriented mode. And mother's imperative mode for boys differed significantly from that for girls. Boys perceived mother's verbal control mode as more imperative. 2) There were significant negative correlations between mother's imperative mode and boy's social competency, between mother's imperative mode and boy's anxiety, and between mother's imperative mode and boy's internal-external control and boy's social competency, and between boy's internal-external control and boy's leadership. There were significant correlations between mother's position-oriented mode and girl's leadership, between mother's position-oriented mode and girl's, affection on parents, between mother's position-oriented mode and girl's internal-external control. There were significant negative correlations between girl's internal-external control and girl's anxiety. 3) Children's internal-external control was the predictor variable influencing on children' social competency, children's leadership. Children's sex was the predictor variable influencing on children' anxiety. And the mother's imperative mode and the mother's position-oriented mode were the predictor variables influencing on children' affection on parents.

• 아동학회지
• /
• 제22권1호
• /
• pp.227-240
• /
• 2001

This review examined trends in research on the assessment of Korean children's story comprehension. Specific areas that were analyzed included types of questions asked in the assessment and variables treated as relevant to the assessment of story comprehension. Literal, inferential, and critical questions were identified. Among the 33 studies reviewed, 20 used all 3 types of questions, the other 13 used only literal questions. The studies using only literal questions interpreted comprehension of a story as "comprehension of letters and/or components of a story." The other studies interpreted it as "comprehension of implied meaning of a story." Other relevant variables were "teaching strategies" (29 studies) and "structural components" (4 studies). None of the studies treated "children's internal variables related to story comprehension."

• 한국유체기계학회 논문집
• /
• 제14권2호
• /
• pp.47-51
• /
• 2011

This paper describes the shape optimization of a blower impeller used for a refuse collection system. Two design variables, which are used to define the blade angles of an impeller, are introduced to increase the blower performance. A blower efficiency is selected as an object function, and the shape optimization of the blade angles is performed by a response surface method (RSM). Three-dimensional Navier-Stokes equations are introduced to analyze the internal flow of the blower and to find the value of object function for the training data. Relatively good agreement between experimental measurements and numerical simulation is obtained in the present study. Throughout the shape optimization, blower efficiency for the optimal blade angles is successfully increased up to 3.6% compared with that of reference at the design flow rate. Detailed flow field inside the turbo blower is also analyzed and discussed.

• 가정과삶의질연구
• /
• 제19권5호
• /
• pp.129-145
• /
• 2001

The purpose of this study was to investigate the relationship of marital communication, home management strategy and family life satisfaction, the data were obtained from 463 wives who lived lived in Seoul. The major findings were as follows: 1) The efficiency of marital communication showed a significant difference in their age, education level, work status, monthly income, number of children, internal-external controllabiltiy and perception of life level. 2) Time strategy and housework strategy were differed by their socidemo-graphic variables and psychological variables. But finance strategy was not affected by any variable. 3) Influential variables of family life satisfaction were the efficiency of marital communication, perception of life level and home management strategy.

• 한국디지털정책학회:학술대회논문집
• /
• 한국디지털정책학회 2005년도 추계학술대회
• /
• pp.447-463
• /
• 2005

The purposes of this study is to investigate the factor structure of web-site characteristics and antecedents factors affected to trust, satisfaction and behavioral intention of web-site. Refined data were consisted of 4 internet shopping mall survey and estimated the perception to visiting web site. Statistical methods are adapted Frequency, Factor Analysis and CFA(Confirmatory Factor Analysis) of LISREL. 8 program. Research findings are as follows. The factors of web characteristics indicated to product information/buying procedure clarification, stability and function of system, usability of web site, security and protection of individual information, design, clarification of enterpriser information, various payment methods and customer service. In regression analysis, dependent variables were trust, satisfaction and behavioral intention. reputation of site were significantly effected variables. External variables consisted of the 4 characteristics of web-site and reputation and trust, satisfaction and behavioral intention were internal factor.

• 기술혁신학회지
• /
• 제8권3호
• /
• pp.1175-1198
• /
• 2005

The objective of the study is to verify the relationship between technology valuation indexes and corporate's performance in ventures by business operating periods. The result of the study is expected to be useful in loan evaluation, investment decision, internal management decision making and business improvement. The results of study is as follows. First, in early stage ventures, we find that three major valuation index(technology feasibility, economic efficiency, productivity) are significant ex-ante variables which are discriminating between firms' going concern and firms' failure. Second, in growth stage ventures, we find that three major valuation index(business feasibility, general marketability, technology marketability) are significant ex-ante variables which are discriminating between firms' going concern and firms' failure. Third, in early stage ventures, we find that at least thirty-eight minor valuation index elements are significant ex-ante variables which are discriminating between firms' going concern and firms' failure and in growth stage ventures, thirty-one minor valuation index elements are significant in various analysis' results.

• 가족자원경영과 정책
• /
• 제7권2호
• /
• pp.25-44
• /
• 2003

The purpose of the present study was to suggest the efficient communication methods for improving the quality of marriage and life in the elderly couples. For this study we considered variables connected with the communication efficiency of elderly couples. We investigated 462 elderly men and women whose spouse is alive and Seoul and the National Capital region. The major findings of this study are summarized as follows. 1) The communication efficiency of elderly couples was over than middle level so we could find that they communicate efficiently. 2) The communication efficiency of elderly couples differs significantly according to sex, education level, economic condition, health status, family type, social activity, sociotropy Personality, self-esteem, internal-external controllability, marital intimacy, relative comparison in the level of living. 3) The communication efficiency of elderly couples was dependently affected by intimacy, economic status, relationship; this variables had 40% explanation for communication efficiency.

• Geomechanics and Engineering
• /
• 제12권2호
• /
• pp.313-326
• /
• 2017

Based on the reliability theory and limit analysis method, the roof stability of a shallow tunnel is investigated under the condition of surface settlement. Nonlinear Hoek-Brown failure criterion is adopted in the present analysis. With the consideration of surface settlement, the internal energy and external work are calculated. Equating the rate of energy dissipation to the external rate of work, the expression of support pressure is derived. With the help of variational approach, a performance function is proposed to reliability analysis. Improved response surface method is used to calculate the Hasofer-Lind reliability index and the failure probability. In order to assess the validity of the present results, Monte-Carlo simulation is performed to examine the correctness. Sensitivity analysis is used to estimate the influence of different variables on reliability index. Among random variables, the unit weight significantly affects the reliability index. It is found that the greater coefficient of variation of variables lead to the higher failure probability. On the basis of the discussions, the reliability-based design is achieved to calculate the required tunnel support pressure under different situations when the target reliability index is obtained.