• 한국전산유체공학회:학술대회논문집
• /
• 1998.05a
• /
• pp.138-144
• /
• 1998

The BGK equation, which is the kinetic model equation of Boltzmann equation, is solved using FDDO(finite difference with the discrete-ordinate method) to compute the rarefied flow of monatomic gas. Using reduced velocity distribution and discrete ordinate method, the scalar equation is transformed into a system of hyperbolic equations. High resolution ENO(Essentially Non-Oscillatory) scheme based on Harten-Yee's MFA(Modified Flux Approach) method with Strang-type explicit time integration is applied to solve the system equations. The calculated results are well compared with the experimental density field of NACA0012 airfoil, validating the developed computer code. Next. the computed results of circular cylinder flow for various Knudsen numbers are compared with the DSMC(Direct Simulation Monte Carlo) results by Vogenitz et al. The present scheme is found to be useful and efficient far the analysis of two-dimensional rarefied gas flows, especially in the transitional flow regime, when compared with the DSMC method.

• Journal of The Korean Society of Agricultural Engineers
• /
• v.56 no.2
• /
• pp.59-64
• /
• 2014

In this study, the large scale test was performed to investigate the behavior of failure for the embankment and spillway transitional zone by overtopping. The pore water pressure, earth pressure, settlement and failure pattern of covering embankment with geotextile were compared and analyzed. The pore water pressure showed a small change in the spillway transition zone and core, indicating that the geotextile efficiently reinforced the embankment. The earth pressure decreased the infiltration of the pore water only in inclined cores type to secure local stability. The behavior of failure started from the bottom and gradually progressed upwards. After the intermediate overtopping period (100 min), width and depth of the seepage erosion were very small due to the effect of geotextile which delayed failure. Therefore, the reinforced method by geotxtile was a very effective method to respond to the emergency due to overtopping.

• Special Issue of the Society of Naval Architects of Korea
• /
• 2005.06a
• /
• pp.76-83
• /
• 2005

Membrane type LNG Carriers are characterized by their special structures such as trunk deck above upper deck. It is necessary to introduce an appropriate structure arrangement taking into account transition of the trunk deck to the upper deck or deckhouse in fore and aft parts. The transition area at aft part -from trunk deck to the deckhouse - is to be specially considered because of high longitudinal stresses applied at the area. This study has been carried out to tackle the transitional structure problem in design stage This paper deals with not only mesh size of FE models for scantling evaluation and fatigue assessment but also technical issues regarding fatigue assessment.

• Proceedings of the KIEE Conference
• /
• 2002.06a
• /
• pp.166-171
• /
• 2002

We are in transitional period of welding technique, which has changed from the stage of quantity and quality to the stage of future technique, imported and introduced from many advanced countries. Therefore, many researches and studies for development on high speeding and making welding machines with high effectiveness has been doing vigorously. In this dissertation, I have studied on a pulsed MAG welding machine, with which welding of thin plates may perform high speeding and effecting. First, I produced a phase shifted full bridge DC-DC convert, which is the type of reduced conduction loss and the power supply for welding machine. And then, I found out an output waveform control algorithm about one pulsed one droplet and short waveform control for thin plates with high speed by deriving the circuit model utilizing the circuit averaged method for full bridge converter.

• Journal of Korea Multimedia Society
• /
• v.22 no.3
• /
• pp.395-402
• /
• 2019

Star characters play a key role in the background of contents that secure global competitiveness. In this study, we study the growth factors and transitional forms of Nintendo Super Mario Bros. and suggest the direction of nurturing Korean star characters. As a result of the analysis of Super Mario Bros., it was possible to derive the growth factors of Originality, repeatability, Continuity, Pertain, and Star Fame and the transition result of step development method. Robot Taekwon V was presented as a reference model while Korean game characters with global competitiveness were excavated. Robot Taekwon V, which combines the features of friendly, unique, symbolism, and narrative, could be used to present a development model of the type of jump development. In the jump development model, character development and Upbringing, diversification of genre, pioneering of new markets combined with new technology, and fostering of characters through linkage with other industries were presented.

• Proceeding of Spring/Autumn Annual Conference of KHA
• /
• 2008.11a
• /
• pp.217-221
• /
• 2008

The goal of this research is to analyze interrelationship for layout of dwelling house and variation of its side plane by introducing concept of space in order to address as to how Korean traditional houses had been formed and varied in the middle of advancing modern city. In addition, this paper also has its meaning in a way that it identified how Korean traditional houses have been changed, and thus make residents more comfortable to live there by reviving their past characteristics, and make users have traditional food culture. Targeted area for this paper is limited to south-eastern area of Daegu such as Namsanjung, Myeongchijung, Sijangjung, Shinjung and Dalsungjng which was group dwelling houses of people of Chosun Dynasty during Japanese colonial rule' era ($1910{\sim}1945$). Among those places, the paper has chosen a place where Korea traditional houses were well preserved, variation of road and fields was less 1930s, and residential type is easy to effectively compared. As the result of this research, time when traditional cities were changed into new type of city residential area is believed to be around 1930s, and traditional residential area, through its transitional process, is believed to be changed to modern residential area. It also indicates that change of organizational road and fields directly had influence on change of houses.

• The Bulletin of The Korean Astronomical Society
• /
• v.37 no.1
• /
• pp.79.1-79.1
• /
• 2012

We present here $UBVI$ and H${\alpha}$ photometric results of stellar sources in the bubble nebula NGC 7635. The early type members are selected from the photometric membership criteria. H${\alpha}$ photometry allows us to detect 11 pre-main sequence candidates with H${\alpha}$emission. In addition, we performed PSF photometry for the Spitzer IRAC and MIPS 24${\mu}m$ images from archive (program ID 20726, PI: J. Hester) in order to search for the young stellar objects (YSOs). Total 19 sources are classified as YSOs (7 class I, 11 class II, and 1 transitional disk candidates) in the color-color diagrams according to the classification scheme of Gutermuth et al.. Among them, 7 YSOs have counterparts in optical photometric data. These stars can be divided into two groups at given color indices. It implies that there occurred the star formation events more than twice. We would like to discuss the star formation history in the bubble nebula using the results from SED fitter (Robitaille et al.), color composite image from IRAC bands, and spatial distribution of early type stars and YSOs.

• Korean Journal of Rural Living Science
• /
• v.5 no.2
• /
• pp.159-169
• /
• 1994

The Purpose of this study was to investigate the actual conditions of rural housewife's sex role attitude, the value consciousness of home management and the satisfaction of household work. Further, basic data for the improvement of the satisfaction of household work and the value consciouseness of home management will be produce through grasping the relationship of them. For these purposes, the data were collected by using questionnaire distributed to 292 housewives living in Cheong Song. The data were analyzed using descriptive statistics, One Way Anova, Pearson's Correlation analysis and Multiple Regression analysis. The results of the research were as follows : 1. Rural housewife's sex role attitude comparatively took the transitional position and the value consciousness of home management was modernized. Housewife's satisfaction of household work was generally usual. 2. There were significant differences in the sex role attitude according to the type of housing. 3. The value consciousness of home management of rural housewives was variable according to housewife's occupation, husband's occupation and the type of housing. 4. Among the independent variables, the number of family member, the number of children and family style. 5. There were significant differences in the satisfaction of household work according to housewife's sex role attitude. 6. Among the independent variables, the number of children, monthly family income, the sex role attitude, the value consciousness about household work, education and leadership had significant influence on the satisfaction of household work.

• Journal of computational fluids engineering
• /
• v.21 no.3
• /
• pp.48-54
• /
• 2016

In the present work, numerical simulations were conducted on the scaled model of the BWB type UCAV in the subsonic region using ANSYS FLUENT V15. The prediction method was validated through comparison with experimental results and the effect of the twisted wing was investigated. To consider the transitional flow phenomenon, ${\gamma}$ transition model based on SST model was adopted. The coefficients of lift, drag and pitching moment were compared with experimental results and the pressure distribution and streamlines were investigated. The twisted wing decreases the lift force but increases lift-to-drag ratio through delay of stall and leading edge vortex's movement to the front, also the non-linearity of the pitching moment is decreased.

• Korean Institute of Interior Design Journal
• /
• v.19 no.1
• /
• pp.190-199
• /
• 2010

Nowadays the increasing improvement of quality of life have been required more diversified housing environment. And it also focused on concern about Korean traditional housing style, Hanok. There were several studies applied to traditional style design on Hanok. but few on Hanokstyle apartment. So the purpose of this study were to identify the consumer awareness on Hanok style apartment plan and its design details. The research were done by questionnaire methode. It were distributed to 130 city and rural residents. 109 questionnaires were analyzed by frequency, Percentage, $x^2$-test, F-test, ANOVA, t-test, and factor analysis. The major results were as follows. First, 70% of respondents revealed their intention to live in Hanokstyle housing if it has improved conveniency and lowered maintenance expenses. Second, they preferred under 5 story row house type or apartment type Hanok located in suburbs. Third, Hanokstyle apartment characteristics were expected to have visual openness, good view, traditional decor, functional, rhythmical and transitional space. And also they wanted traditional Madang(inner garden) and Maru(a wooden floor room) located next to living room.