• Journal of Information Technology Services
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• v.15 no.2
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• pp.203-217
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• 2016

This paper explores the distribution of the retail coffee franchise stores in Seoul using geostatistical analyses. The fact that lots of coffee stores are concentrated in the central area-Jongno and Jung-gu and commercial area-Gangnam and Seocho shows that the size of the floating population and potential customers is one of main drivers for making decisions on the locations of new stores. Except these 4 districts, the number of stores and population exhibit a positive correlation. By extracting the information on the 6 large coffee franchises store locations, we calculate the both haversine distances between stores of the same franchise and between stores of different franchises. We then empirically test the sitting and marketing strategies of Starbucks, Ediya, and Paik-Dabang using distance distributions. Significant pairs of Starbucks stores located within 100m confirm the sitting strategy of Starbucks which opens additional stores at crossways, stations, near shopping malls or other business zones though there already exist Starbucks stores. Meanwhile considerable portion of Ediya stores are found near Starbucks stores, which coincides with the sitting strategy of Ediya. We also find that Paik-Dabang that uses the low cost strategy has its stores open relatively farther than other franchises from Starbucks stores.

• Journal of Families and Better Life
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• v.23 no.1 s.73
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• pp.161-172
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• 2005

The purpose of this study is to grasp actual status and needs of leisure of middle age. The questionnaire survey is used, the subjects are middle age from 40$\~$50's living in seoul. The questionnaire consists of leisure conscious, leisure actual condition, leisure satisfaction and need. Frequency, percent, average, $x^2_test$ and ANOVA are used for data analysis. The results of this study are as following; First, leisure is necessary to elevate quality of life in terms of spiritual, psychological stability and physical health. Second, the subjects are not satisfied with current leisure for unsufficiency of leisure time, cost, facility and program. Third, present leisure behavior characteristics are restrictive and passive. In the near future, however, they showed desire to engage in fivers forms of leisure including active and participant leisure. Fourth, even though current main areas for leisure activity are in their house, they are more likely to change from in the house to around and near there house.

• The Bulletin of The Korean Astronomical Society
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• v.41 no.2
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• pp.44.2-45
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• 2016

We present near-infrared photometric properties of red supergiant stars (RSGs) in three galaxies NGC 4449, NGC 5055 and NGC 5457. The near-infrared imaging data of WFCAM UKIRT were used and combined with optical archive data to identify the RSGs in the galaxies. We found that the RSGs can be identified from the foreground Galactic stars in (i-K, ri) colour-colour diagram. The effective temperatures and luminosities of the identified RSGs are estimated from JHK photometry using MARCS model. In the H-R diagram, the majority of RSGs in the galaxies are distributed between $logL/L{\odot}=4.8$ and 5.7, and their effective temperature and luminosities agree with the current evolutionary tracks with masses in the range $9-30M{\odot}$. We also compared the spatial distribution of RSGs with the HII regions. A tight spatial correlation between RSGs and HII region was found in NGC 4449 and NGC 5457. We do not find a clear metallicity dependance on the RSG effective temperature in the three galaxies, but the maximum luminosity of the three galaxies is constant at $logL/L{\odot}{\sim}5.6$. Additional spectroscopy data, including photometry are essential to examine whether the physical properties of RSGs change with metallicity.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.21 no.9
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• pp.1218-1229
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• 1997

The diffusional-thermal instability of diffusion flames in the premixed-flame regime is studied in a constant-density two-dimensional counterflow diffusion-flame configuration, to investigate the instability mechanism by which periodic wrinkling, travelling or pulsating of the reaction sheet can occur. Attention is focused on flames with small departures of the Lewis number from unity and with small values of the stoichiometric mixture fraction, so that the premixed-flame regime can be employed for activation-energy asymptotics. Cellular patterns will occur near quasisteady extinction when the Lewis number of the more completely consumed reactant is less than a critical value( ~ =0.7). Parametric studies for the instability onset conditions show that flames with smaller values of the Lewis number and stoichiometric mixture fraction and with larger values of the Zel'dovich number tend to be more unstable. For Lewis number greater than unity, near-extinction flame are found to exhibit either travelling instability or pulsating instability.

• The Bulletin of The Korean Astronomical Society
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• v.43 no.1
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• pp.65.3-66
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• 2018

We present the results of high-resolution optical (R ~ 30,000) and near-infrared (R ~ 45,000) spectroscopic monitoring observations of a new FU Orionis-like young stellar object, 2MASS J06593158-0405277. FU Orionis objects (FUors) are well-studied examples of episodic accretion because of their outburst phenomenon. Recently, 2MASS J06593158-0405277 exhibited an outburst and was identified as a FUor. It provides an important opportunity to investigate the whole FUors phenomenon from its pre-outburst to its post-outburst phase. We monitored 2MASS J06593158-0405277 with the BOES and the IGRINS since Dec 25, 2014 (UT). We detected several wind and disk features and present here our analysis for time variations of those spectral lines.

• International Union of Geodesy and Geophysics Korean Journal of Geophysical Research
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• v.26 no.1
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• pp.31-41
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• 1998

The climatic characteristics of summer in 1998 are analyzed with the weather observational data and the upper air observational data. The temperature of that period is lower than that of normal years and the precipitation is larger. Due to the heavy rainfall which started at July 31, rain pured down compared to normal years and the maximum precipitation recorded at the many observational stations, particularly in Seoul, Kyunggi-Do region and mountanious districts like Taegwallyong, Mt. Sokri and Mt. Chiri. The patterns of general circulations in 1982/98 and 1997/98 are compared each other and are analyzed. The anomaly patterns of stream functions on winter in two El Nio years are simialr. The counterclockwise circulation occurred near the date line and the clockwise circulation was appeared near the Hwanam region and Alaska. These patterns are opposite to those of La Nia year, 1988/89. And the anomaly patterns of 500hPa geopotential height in summer are similar, too. The low temperature and much rain were dominated in summer of 1997/98. These phenomena is similar to the existing results of research, that temperature is low and precipitation is large in summer of El Nio years.

• Korean Journal of Adult Nursing
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• v.23 no.5
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• pp.482-493
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• 2011

Purpose: This study was conducted to compare and identify the mediating effect of family communication in the impact of death anxiety and personal meanings of death on the attitude of dignified death near the end-of-life among Korean mid-life and old people. Methods: A cross-sectional study was conducted with 287 mid-life and old people in Seoul, Busan, and Daegu City. Data were collected through self-report questionnaires which were standardized instruments from November 2010 to March 2011. Data were analyzed by using SPSS/WIN 14. Results: The results of the study indicated that there were statistically significant differences in level of death anxiety, personal meaning of death, and the dignified death between mid-age and old-age people. In addition, family communication had full mediating effects among the mid-age, while it had partial mediating effects among the old-age in the relationships between death anxiety, personal meaning of death, and the attitude of dignified death. Conclusion: Based on the findings of the study, implications for the intervention of the dignified death and preferences for care near the end-of-life among mid-life and old people and recommendations of further study were provided.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.25 no.10
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• pp.1355-1364
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• 2001

Characteristics of secondary vortices is topologically investigated in the near-wake region of a circular cylinder, where the Taylor's hypothesis does nut hold. The three-dimensional flow fields in the wake-transition regime were measured by a time-resolved PIV for various planes of view. The convection velocities of the Karman and secondary vortices are evaluated from the trajectory of the vortex center. Then, saddle points are determined by applying the critical point theory. It is shown that the inclination angle of the secondary vortices agrees well with the previous experimental data. The flow fields in a moving frame of reference have several critical points and the mushroom-like structure appears in the streamline patterns of the secondary vortices. Since the distributions of fluctuating Reynolds stresses defined by triple decomposition are closely related with the existence of secondary vortices, the physical meaning of them is explained in conjunction with the vortex center and saddle point trajectories.

• Geotechnical Engineering
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• v.12 no.1
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• pp.87-110
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• 1996

To simulate the three4imensional effect occurring near the tunnel face in a two -dimensional model, empirical load -dirtribution ratio concept is frequently used in tunnel design. In this paper, three -dimensional analysis is performed and its results are compared with those of two dimensional analysis'to investigate the applicability of the loadiistribution ratio concept. Especially, stress concentration near the tunnel face is investigated in depth. A parametric study is performed to investigate the effect of each factor on the load distribution ratio. The factors considered here include unsupported span length, initial stress, rock quality, tunnel size and the depth of tunnel location Moreover, the load -distribution ratios for the typical tunnel sections in Seoul Subway to be used in the tunnel design are suggested.

• The Korean Journal of Zoology
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• v.11 no.2
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• pp.65-68
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• 1968

Collections of the drosophilid flies were made at 6 regions near the dimilitarized znoe form October 1966 to June 1968, with particular attention to their habitats and distribution. A total of 5022 flies representing 34 species belonging to 7 genera were obtained mostly by the traps baited with fermenting apples and banana, partially by the aid of net. The data accumulated for about 21 months are summarized in this paper. Drosophila auraria and D. angularis were found to be most common species showing the most extensive distribution. In eastern part, a total of 1552 individuals(30.90%) representing 27 species, 7 genera were sampled. In central part, a total of 2658 flies (52.93%) yielded 29 species, 6 genera. In western part, a total of 812 specimens(16.17%) which belong to 16 species representing 3 genera were collected. Most specimens belonging to the genus Scaptomyza have been found on grasses.