• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.15 no.5
• /
• pp.2844-2858
• /
• 2014

The society experiencing the industrialization and urbanization has got over the socio-demographic change. these changes make the number of the population around the world, and this phenomenon is flowing into the whole country. Korea has became a Aging Society since 2000 and will be turned into the aged society by the 2018. therefore, the importance of preparing elderly living life such as silver town is getting emphasized. the purpose of this study is aimed at analyzing the decision elements of the preliminary demanders' intention who selecting Elderly Housing. Based on this study, it was broken down by the type much more. Binary Logistic Regression Analysis of Factors affecting the Elderly housing choices were subdivided. Through this process, improvement and the implications of this study was derived. this study deducts 3 kinds of implications. First, the preference for the development of elderly housing are different with each type of characteristics. Second, the indicators along with the individual characteristics account for the most part of the surface. so the specific investigation for the demand must be required to check the indicators. Third, when it comes to development of urban elderly housing, it requires to have a part of a local government plans securing the land. Fourth, when it comes to development of suburb elderly housing, it is required to arrange the living environment around the suburbs to let user classes living in Gyeonggi-do flow into elderly housing and live their new-life in the suburbs. Finally, when it comes to development of rural elderly housing, a variety of production, leisure and other programs should be made and put into there.

• Korean Journal of Agricultural and Forest Meteorology
• /
• v.15 no.1
• /
• pp.17-25
• /
• 2013

In this paper we interpreted the changes in wind field over complex mountainous terrains. The results of our study can be applied for predicting the direction of fire spread and for establishing strategies for fire prevention. The study area is bounded by $12{\times}12$ km domains of the Samcheok's long-term ecological research (LTER) site located in the east coast, in which a large-fire had occurred from 7 to 13 April 2000. Because of the area's complex topography, we compared the result of the Weather Research and Forecasting (WRF) mesoscale model with those observed by four automated weather stations. The WRF simulation overestimated the wind speed by 5 to 8 m/s (~200%) in comparison with those from four automated weather stations. The wind directions observed by the AWSs were from various directions whereas those from WRF model were mostly west wind at all stations. Overall, the simulations by the WRF mesoscale models were not appropriate for the estimation of microscale wind fields over complex mountainous areas. To overcome such inadequacy of reproducing the wind fields, we employed the ENVI-met model over Samcheok's LTER site. In order to test the model's sensitivity with the terrain effects, experimental simulations were conducted with various initial conditions. The simulation results of the ENVI-met model showed a reasonable agreement in wind speeds (about 70% accuracy) with those of the four AWSs. Also, that the variations in wind directions agreed reasonably well with changes in terrain effect. We concluded that the ENVI-met model is more appropriate in representing the microscale wind field over complex mountain terrains, which is required to predict fire spread and to establish strategies for forest fire prevention.

• Korean Journal of Environment and Ecology
• /
• v.31 no.3
• /
• pp.287-296
• /
• 2017

In order to check host plant diversity and to confirm the potential risk to be invaded, we documented host plant flora and plant part of C. pentagona, an invasive parasitic plant in field survey and induced parasitic infection by them in the laboratory experiment. Parasitic interaction(12% of total tree species) was found in twig and leaf of tree such as Quercus mongolica and Abies holophylla that was not developed into ligninfication. There were most host plant species belong to Compositae, but the species parasitic rate of family was higher in Cyperaceae, Polygonaceae and Leguminoceae. Through the inducible infection experiment with C. pentagona, all species except one species show parasitic interaction between host plan and C. pentagona. These result means that the limiting stage for invading area is dispersion process for invading other area in Korea. Infection plant part by C. pentagona was dominantly both shoot and leaf, rather than only leaf or only shoot. We found newly 12 families and 45 host plant species including 33 herbacious one and 12 woody one. Crop plant such as Setaria italica and 6 endangerd one such as Scrophularia takesimensis, especially the later rare endemic plant was to death by parasitic infection of C. pentagona. These results indicate that C. pentagona is potential risk to both wild and cultivated plant in Korea.

• Analytical Science and Technology
• /
• v.22 no.6
• /
• pp.464-470
• /
• 2009

For the investigation of the oxidation behavior for titanium metal at various temperatures, titanium specimens were heated for 2 hours in the range of $300{\sim}1000^{\circ}C$, individually. And then X-ray diffraction(XRD), scanning electron microscopy (SEM)/energy dispersive spectroscopy (EDS) and attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectroscopic analyses were carried out. At $300^{\circ}C$, infrared absorption bands on the surface of the titanium specimen were shown in a spectrum by the oxygen uptake of titanium metal(hexagonal). At increased temperature, not only infrared absorption bands but also X-ray diffraction peaks for the titanium oxide were grown and shifted to low wave number ($cm^{-1}$) and angle($^{\circ}$) due to the more oxygen diffusion into titanium metal. At $700^{\circ}C$, $Ti_3O$ (hexagonal phase) was identified by X-ray diffractometer. $TiO_2$ (rutile, tetragonal phase) layer was produced on the surface of the specimen below $1{\mu}m$ in thickness at $600^{\circ}C$, and grown about $2{\mu}m$ at $700^{\circ}C$ and with $110{\mu}m$ in thickness at $1000^{\circ}C$. Above $900^{\circ}C$, (110) plane of the crystal on the surface of rutile-$TiO_2$ layer was grown.

• Korean Journal of Environmental Biology
• /
• v.42 no.1
• /
• pp.62-79
• /
• 2024

Garlic mustard (Alliaria petiolata) is a species that has devastated the United States and Canada. It is known to play a role in destroying the ecosystem. In this study, the domestic distribution of garlic mustard was confirmed and a detailed distribution map was created for the Samcheok region, where the largest population has been established in South Korea. This study investigated the growth environment, life cycle, and population dynamics of the species in the Samcheok region. Garlic mustard was found in a total of 301 locations in Samcheok, with a total distribution area of 2,957 square meters. Annual plants germinated in mid-April, overwintered in rosette form, underwent vegetative growth from April 10 to April 24 the following year, and flowered from April 24 to May 7. Individuals producing seeds began to die off from June. Both annual and biennial individuals showed a trend of increasing and then decreasing in number around April 27 (118 days). Garlic mustard grew well under favorable light conditions in early spring. They showed less growth on leaf litter, short distance from roads, lower altitude, deciduous broad-leaved forest of middle and lower parts of the slope and forest edge. Without proper control measures in the Samcheok region, it is likely to spread more rapidly in deciduous broad-leaved forests along hiking trails in the Galyasan Mountains. In particular, it is more likely to extend to oak community where light enters the site during flowering than to pine community where there is less light in the site.

• Journal of Digital Convergence
• /
• v.12 no.9
• /
• pp.335-341
• /
• 2014

Due to the expiration of the 3D printer's patent, the articles covering the market activation and bright prospects for the future industry are being released. What are the requirements for the 3D printer to become popular like a general printer? To get the answer, on-line survey was performed for the activation of 3D printer. As a result, tit is observed that he public prefers creative printer and figure, and prefers to use through pay or free download rather than designing digital blueprint, which is output data. For the activation and popularization of 3D printer, figure is familiar to the public who are frequently exposed to image media contents, and it also has motivation factor to use and purchase 3D printer. For distribution of digital blueprint of figure content, the preparation of related law and regulation and activation of online market would be of help for activation of 3D printer.

• The Korean Journal of Applied Statistics
• /
• v.22 no.2
• /
• pp.365-373
• /
• 2009

Since 1990, identifying the sex of fetus and illegal abortion has brought the sex ratio imbalance at birth in Korea due to a notion of preferring a son to a daughter, socio-economic development, population policy, and so forth. Although there have been many researches such as time series analysis and region difference analysis to monitor this sex ratio imbalance, they have a defect that time and space could not be included in the analysis simultaneously. This study analyzes the sex ratio imbalance at birth, taking into account time and region at the same time. The analysis considered the numbers of male and female babies, who were born as the third or latter in their families, in 2000 and 2001 at 234 Gu / Si / Goon administrative districts. Here, we suggest a mixture model of binomial distributions, assuming heterogeneous populations. The estimation of the location parameters, weights and correlation coefficient of the mixture model is conducted by the EM algorithm, and the heterogeneity of the regions is expressed as a picture using ArcView GIS.

• Transactions of the Korean Society of Mechanical Engineers B
• /
• v.36 no.6
• /
• pp.639-646
• /
• 2012

The characteristics of autoignited lifted flames in laminar jets of carbon monoxide/hydrogen fuels have been investigated experimentally in heated coflow air. In result, as the jet velocity increased, the blowoff was directly occurred from the nozzle-attached flame without experiencing a stabilized lifted flame, in the non-autoignited regime. In the autoignited regime, the autoignited lifted flame of carbon monoxide diluted by nitrogen was affected by the water vapor content in the compressed air oxidizer, as evidenced by the variation of the ignition delay time estimated by numerical calculation. In particular, in the autoignition regime at low temperatures with added hydrogen, the liftoff height of the autoignited lifted flames decreased and then increased as the jet velocity increased. Based on the mechanism in which the autoignited laminar lifted flame is stabilized by ignition delay time, the liftoff height can be influenced not only by the heat loss, but also by the preferential diffusion between momentum and mass diffusion in fuel jets during the autoignition process.

• Journal of Digital Contents Society
• /
• v.8 no.2
• /
• pp.205-211
• /
• 2007

The marketing using coupons policy is using in various business departments. The coupon marketing gives advantages to consumers and stores, too. The coupon policy gives discount to consumers. The stores can reduce cost of advertisement. It activates the motivation of consumers to give his loyalty to the specific store. Although the coupon marketing has these merits, there are too many coupons in the purse of consumers. The consumers should collect their coupons in their purse. The shops have to calculate the points of each consumer's coupons differently. The processing process of coupons is too complex to manage. This paper implements the managing system to control stamps in mobile devices. "Collecting Stamp" resolves those problems and enables to manage various coupons in mobile environment.

• Journal of Global Scholars of Marketing Science
• /
• v.15 no.2
• /
• pp.183-201
• /
• 2005

The lowest price guarantee policy or price-matching guarantee is the pricing policy that promises to compensate more than the price difference if a consumer finds a lower price for the identical model he or she purchased and submits a certain proof. Most of Korean large discount stores emphasize their competitive price level by adopting the lowest price guarantee policy so that the entire Korean distribution industry is deeply influenced by the policy. The article is the study regarding the effects of the lowest price guarantee policy in Korean unique industry environments. The study investigated the effects of the policy on consumers' preferences of stores. By using the conjoint measurement model, it identified the main effects and interaction effects between the policy and other independent variables. The results showed the significant effects of the policy on consumers' preference of stores and identified the interaction effects between the distance from the residence and the policy, and between overall store price level and the policy.