• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.7 no.1
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• pp.41-50
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• 1998

The detemination of sound pressure radiated from peoriodic plate structures is fundamental in the estimation of noise levels in aircraft fuselages and ship hull structures. As a robust approach to this problem, here a very general and comprehensive analytical model for predicting the sound radiated by a vibrating plate stiffened by periodically spaced orthogonal symmetric beams subjected to a sinusoidally time varying point load is developed. The plate is assumed to be infinite in extent, and the beams are considered to exert both line force and moment reactions on it. Structural damping is included in both plate and beam materials. A space harmonic series representation of the spatial variables is used in conjunction with the Fourier transform to find the sound pressure in terms of harmonic coefficients. From this theoretical model. the sound pressure levels on axis in a semi-infinite fluid (water) bounded by the plate with the variation in the locations of an external time harmonic point force on the plate can be calculated efficiently using three numerical tools such as the Gauss-Jordan method, the LU decomposition method and the IMSL numerical package.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.4
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• pp.2526-2531
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• 2014

This paper has analyzed the effects of CEO turnover and other fundamental variables on stock returns. Therefore, the major purpose of this study is to analyze CEO turnover having a systematical effect on the stock return. The paper uses panel data analysis. We find that the results of regressions say that CEO turnover, book-to-market ratio, earning-to-price ratio, cash flow-to-price ratio, and firm size can explain the differences in average returns across stocks.

• Korean Institute of Interior Design Journal
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• v.20 no.6
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• pp.236-243
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• 2011

The digital space color of new media environment denied not only the deterministic relationship of designed color and circumjacent color but also the deduced an special elements of digital space color. Such phenomena historical perspective of Gernot Wersig, new media principle of Lev Manovich and remediation of Bolter, J.K & Grusin, R. are expressed in various new media environment across. In particular, development of digital technology is moving away from its previous space color based on scientific, statistical and quantitative perspective by using diverse variables. The following research focuses on the fundamental concept of space color by type, composition of digital space color. The paper reflects on the meaning and concept of contemporary which enables the application of digital space color system on space through advanced technology. The principle of digital space color such as multidimensional malerisch, discontinuous video, vague original and copy, irregular repetitiveness of 'copy of copy', selective color of observer, experiential color of observer, and etc. makes it possible to extract the expressed element and method of digital space color. Meanwhile, the features of digital space color such as divided field of form, non-systematized of process and collage of communication can be inferred from case analysis.

• Journal of Korean Academy of Fundamentals of Nursing
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• v.14 no.4
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• pp.474-482
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• 2007

Purpose: This study was done to provide fundamental data for nursing interventions to prevent and reduce fatigue and to identify fatigue and kidney disease symptoms in female patients on hemodialysis and evaluate factors associated with this fatigue. Method: A cross-sectional study design was used with self-administered questionnaires which included general characteristics and the fatigue scale developed by Brown, Dittner, Findly, & Wessely(2005)(Cronbach's $\alpha=0.98$ and for present study $\alpha=0.96$) and a review of laboratory data. From eight dialysis units, 84 women were enrolled. Data were analyzed using the SAS program. Results: Mean score for fatigue was 49.4(range $16{\sim}78$) and fatigue by research variables was significantly different by age(0.046), employment status(0.041), menopause(0.009), hypoalbuminemia(0.022), length of time on dialysis(0.48) and kidney disease symptoms(0.000). Correlations between fatigue and lack of strength, dizziness, and cramps after dialysis were significantly higher. Factors affecting fatigue were kidney disease symptoms and length of time on dialysis, explaining 49.2% of fatigue. Conclusion: A comprehensive approach considering kidney disease symptoms, length of time on hemodialysis, age, menopause, and hypoalbuminemia are required for interventions to reduce fatigue in female patients on hemodialysis.

• Journal of Digital Convergence
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• v.10 no.10
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• pp.31-46
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• 2012

Drawing upon Griffin and Neal's safety climate and performance model, this study developed an information security climate model. Research model is composed of three research variables that include information security climate, information security compliance attitude, and opportunistic security behavior. Results of the study strongly support the fundamental proposition that the organizational security climate has significant positive influence on the individual's opportunistic security behavior. However, the study also reveals that the organizational climate may not directly associate with the reduction of opportunistic security behavior. Rather the organizational security climate nurtures the favorable attitude of the employee towards the compliance of information security, which in turn discourages opportunistic security behavior.

• Journal of East-West Nursing Research
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• v.22 no.1
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• pp.1-9
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• 2016

Purpose: We conducted a literature review for analyzing the effect of massage on children according to their developmental stage in Korea. Methods: Various academic databases were utilized for a bibliographic search, and the keyword, 'massage', was used to identify relevant references without limits on years to determine the overall research trends. Finally, 38 references cited from 1998 to 2014 were selected in Korea. Results: Only two studies adapted a randomized controlled trial design. With regard to children's developmental stage, half studies were conducted for neonates. Moreover, the percentage of application of a sensory stimulation protocol in newborn infants was 47.3%. Eighty four point one percent of studies measured physiological characteristics as outcome variables and the rate of growth was the most common (46.5%) physiological characteristic. On the contrary, only one study (4%) was conducted to evaluate the effect of massage on psychological characteristics in school aged and the adolescents. Conclusion: This study provides fundamental data on the development and direction for future studies by analyzing studies on pediatric massage in Korea.

• Journal of Korea Society of Digital Industry and Information Management
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• v.12 no.3
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• pp.181-204
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• 2016

Recently, the exhibition industry based on digital archive has been rapidly growing and the industry sees an innovative change with diverse digital archive exhibition venues emerging. Enabling visitors to enjoy new and varied exhibition provides a turning point to the exhibition environment. In today's world where IT (Information Technology) leads social changes, new framework and contents are required to establish digital culture that connects traditional culture with advanced information telecommunications. The objective of this study is to identify factors that influence the audience in a digital archive exhibition venue and to analyze impacts of these factors on exhibition success based on immersion and satisfaction. The study presents a research model that applies significant variables of emotional response theory in which fundamental psychological desire of humans is emphasized. To empirically verify the research model, the author conducted a survey for students of S university in Seoul and for ordinary people who have been to digital archive exhibition venues.

• Advanced Composite Materials
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• v.18 no.4
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• pp.297-314
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• 2009

A design method is proposed to optimize the stacking sequence of laminated composite plates for desired vibration characteristics. The objective functions are the natural frequencies of the laminated plates, and three types of optimization problems are studied where the fundamental frequency and the difference of two adjacent frequencies are maximized, and the difference between the target and actual frequencies is minimized. The design variables are a set of discrete values of fiber orientation angles with prescribed increment in the layers of the plates. The four lamination parameters are used to describe the bending property of a symmetrically laminated plate, and are optimized by a gradient method in the first stage. A new technique is introduced in the second stage to convert from the optimum four lamination parameters into the stacking sequence that is composed of the optimum fiber orientation angles of all the layers. Plates are divided into sub-domains composed of the small number of layers and designed sequentially from outer domains. For each domain, the optimum angles are determined by minimizing the errors between the optimum lamination parameters obtained in the first step and the parameters for all possible discrete stacking sequence designs. It is shown in numerical examples that this design method can provide with accurate optimum solutions for the stacking sequence of vibrating composite plates with various boundary conditions.

• Journal of the Korean Society of Costume
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• v.51 no.3
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• pp.33-49
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• 2001

The purpose of this study was to analyse the previous color studies. A number of publications and journals were reviewed and analyzed carefully. The results of review and analysis were as follows : There were many different subjects in color studies and they were usually categorized into ten fundamental groups : color preferences, color image/symbol/association of ideas, emotion and colors, image making with colors, colors related with consumers' decision making, traditional colors, semantic color description, color plan of apparel merchandise, influential factors on colors, and color coordination preferences. In general, the color preference studies are conducted most actively, and they are followed by the studies of color image/symbol/association of ideas and traditional colors. In the previous studies on the color preferences, they provided sufficient amount of information on the preferred colors and the preferred apparel colors. however, they lacked in providing appropriate explanation on how these color preferences were related with colors in fashion. Also, there have been no thorough studies that questioned the reliability of measurement methods for obtaining color preference data. The authors also realized that it was extremely difficult to find any related publications on the studies that focus various influential variables on the disagreement between the preferred color and preferred apparel color. Thus, this study directed the future studies to solve the problem discussed above.

• Journal of Korean Association for Spatial Structures
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• v.14 no.4
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• pp.73-80
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• 2014

For the last decade many bridges and buildings have experienced flexural strengthening with the fiber reinforced polymer(FRP) bonding system, demands for increasing heavy traffic loads and the changing of the code application. Of the many strengthening systems, NSM(near surface mounted) system with FRP has become attractive and popular way of strengthening for the existed RC structures and many studies and applications of this technique have significantly increased all over the world. Meanwhile, polymer mortar that contains much of the same ingredients as cement but includes the addition of certain polymer resins for enhancing desired physical properties, has been used as an alternative adhesive. This paper focuses on flexural behaviour of CFRP-bar NSM system with variables such as kinds of adhesive, anchorage, sectional aspect ratio. Based on the test results and test-to-predicted ratio, this paper provides researchers and practical engineers a fundamental knowledge and intuition.