• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2010.10a
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• pp.421-426
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• 2010

With hydraulic noise test facility, a variety of tests were performed to investigate the pulsation pressure generation mechanism and its transmission characteristics and to derive the noise control methodology. Many experiments were carried out by changing average pressure, flow rate, pump speed, hose length and MCV spool condition. From the test results, the correlations between pulsation pressure and other design parameters, such as static pressure, flow rate and MCV spool opening area and length of hose, were found out. And also each contribution factors were evaluated from the regression analysis. By changing hose length, the pulsation pressure resonance phenomenon was investigated. In order to find out the pulsation pressure reduction measures pulsation pressure analysis, such as pulsation pressure of hydraulic pump itself and pulsation pressure of hydraulic system, by using AMESim were studied. In addition hydraulic silencer was developed based on the Helmholtz resonator. And its performance was evaluated by installing the silencer at the excavator.

• Korean Journal of Veterinary Research
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• v.38 no.4
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• pp.777-783
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• 1998

Antigenic types of 114 Salmonella pullorum and 152 Salmonella gallinarum field isolates were evaluated. All 3 antigenic types were identified among field isolates of S pullorum by factor-serum analysis but the majority of them were standard type(90.4%). Of the 114 S pullorum isolates, only eight(7.0%) were intermediate type and 3(2.6%) were variant type. Using the ammonium sulfate precipitation(ASP) test, one-hundred and three(90.4%) S pullorum isolates were standard type, while intermediate and variant types were 8.4% and 1.4%, respectively. One-hundred and fifty-two S gallinarum isolates were identified as standard type by ASP test and serological analysis. According to the random amplified polymorphisms of DNA(RAPD) patterns, most of S pullorum isolates were differentiated with 3 types in their fragment-patterns. No correlations were found between SDS-PAGE profiles and antigenic types of S pullorum isolates.

• International Journal of Naval Architecture and Ocean Engineering
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• v.10 no.3
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• pp.413-420
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• 2018

This paper documents the result of a preliminary analysis on the influence of hull-ice friction coefficient on model resistance and power predictions and their correlation to full-scale measurements. The study is based on previous model-scale/full-scale correlations performed on the National Research Council - Ocean, Coastal, and River Engineering Research Center's (NRC/OCRE-RC) model test data. There are two objectives for the current study: (1) to validate NRC/OCRE-RC's modeling standards in regarding to its practice of specifying a CFC (Correlation Friction Coefficient) of 0.05 for all its ship models; and (2) to develop a correction methodology for its resistance and propulsion predictions when the model is prepared with an ice friction coefficient slightly deviated from the CFC of 0.05. The mean CFC of 0.056 and 0.050 for perfect correlation as computed from the resistance and power analysis, respectively, have justified NRC/OCRE-RC's selection of 0.05 for the CFC of all its models. Furthermore, a procedure for minor friction corrections is developed.

• Journal of The Korean Astronomical Society
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• v.37 no.5
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• pp.563-570
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• 2004

Turbulence is a crucial component of dynamics of astrophysical fluids dynamics, including those of ISM, clusters of galaxies and circumstellar regions. Doppler shifted spectral lines provide a unique source of information on turbulent velocities. We discuss Velocity-Channel Analysis (VCA) and its offspring Velocity Coordinate Spectrum (VCS) that are based on the analytical description of the spectral line statistics. Those techniques are well suited for studies of supersonic turbulence. We stress that a great advantage of VCS is that it does not necessary require good spatial resolution. Addressing the studies of mildly supersonic and subsonic turbulence we discuss the criterion that allows to determine whether Velocity Centroids are dominated by density or velocity. We briefly discuss ways of going beyond power spectra by using of higher order correlations as well as genus analysis. We outline the relation between Spectral Correlation Functions and the statistics available through VCA and VCS.

• 한국전산유체공학회:학술대회논문집
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• 2009.04a
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• pp.315-320
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• 2009

A computational investigation is conducted on free convection from a thin plate having a surface heat source. The thermal configuration simulates the recently-proposed transparent film heater made of a single-walled carbon nanotube film on a glass substrate. The Navier-Stokes computations are carried out to study laminar free convection from the heater. Parallel numerical experiments are performed by using a simplified design analysis model which solve the conduction equation with the boundary conditions utilizing several existing correlations for convective heat transfer coefficient. Comparison leads to the most suitable boundary condition for the thermal model to evaluate the performance evaluation of a transparent thin-film heater.

• Journal of the Korean Society of Clothing and Textiles
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• v.30 no.9_10 s.157
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• pp.1445-1454
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• 2006

The purpose of this study was to examine the effects of consumer-brand relationship on purchasing attitudes toward counterfeits. 341 female college students who had purchased fashion luxury brand products were surveyed. For data analysis, descriptive statistics, factor analysis, pearson's correlations, ANOVA, and multiple regression were used. As the results, consumer-brand relationship was classified into three factors; commitment relationship, trust relationship, and emotion relationship. Also, higher consumer-brand relationship was correlated with higher preference and satisfaction, and lower purchasing attitudes toward counterfeits. Also, among the three groups(heavy/middle/low) of consumer-brand relationship, the heavy group had higher preference and satisfaction, and lower purchasing attitudes toward counterfeits. Also, results revealed that 'commitment relationship' and 'emotional relationship' accounted for 32% of the explained variance in 'favorableness', while 'trust relationship' and 'emotional relationship' accounted for 26% and 29% of the explained variance in 'trust toward product quality'. Based on these results, fashion luxury brand marketing strategy would be suggested.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.21 no.9
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• pp.834-841
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• 2011

Obtaining the real exciting force is important for the analysis of structural vibration or sound radiation to represent the actual condition. But in most cases, it is so difficult to get the actual force signals by direct measurement using sensors due to complex geometry. This paper suggests advanced source identification method which can be applied to the prediction of radiated noise considering correlations between measured signals. This method was implemented to the identification of the fan force in the refrigerator. The analysis of structural vibration and radiated noise caused by the fan force was also performed. The comparison between predicted SPL and measured SPL of the radiated noise by the refrigerator fan showed good agreement.

• The Journal of Korean Society for School & Community Health Education
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• v.16 no.3
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• pp.51-63
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• 2015

Objectives: This study addressed the relationship among communication skill, job satisfaction, and mental health level. Methods: The participants in this study were 222 public health center staff members at 9 community public health centers located in Seoul city and Gyeonggi province. Descriptive analysis, Pearson's correlation, and multiple regression were used for statistical analysis of the data. Results: The main findings are as follows: First, communication skill and job satisfaction showed a significant positive correlation with mental health level. Secondly, some components of mental health level generally showed positive correlations with communication skill and job satisfaction. Third, multiple regression showed that 22% of the variance in the mental health level was explained. Conclusions: Based on these results of this study, we suggested that specialized programs should be established to help in development of social arbitration for public health center staff.

• The Journal of Korean Society for School & Community Health Education
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• v.18 no.1
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• pp.31-42
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• 2017

Objectives: The purpose of this study was to investigate the effect of Sexual Knowledge and Sexual Attitude on the Sexual Coping Behavior among university students and presents basic data for helping healthy Sexual Culture. Methods: A survey was held to the university students in Seoul and Chungcheong cities from April 11 to April 25, 2016. of 237 copies were in the final analysis. For data analysis, SPSS 21.0 for Windows was used. Results: As a result, there were correlations between variables, Sexual Coping Behavior of University students were affected by the gender, distorted sex, have the experience of sexual intercourse and accepted sex. Conclusions: It is need to development program and counseling for establishment of the healthy sex culture of university students.

• Proceedings of the Korean Information Science Society Conference
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• 2003.04c
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• pp.175-177
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• 2003

This paper addresses a problem of classifying human breast cancer into its subtypes. A main ingredient in our approach is kernel machines such as support vector machine (SVM). kernel principal component analysis (KPCA). and kernel partial least squares (KPLS). In the task of breast cancer classification, we employ both SVM and KPLS and compare their results. In addition to this classification. we also analyze the patterns of clinical outcomes in the feature space. In order to visualize the clinical outcomes in low-dimensional space, both KPCA and KPLS are used. It turns out that these methods are useful to identify correlations between clinical outcomes and the nonlinearly protected expression profiles in low-dimensional feature space.