• Journal of the Korean GEO-environmental Society
• /
• v.14 no.3
• /
• pp.13-17
• /
• 2013

Determination of geotechnical characteristics of soil is either to use the field samples to measure the characteristics of soil through laboratory test or measuring the characteristics directly in the field. Field test can be derived similar value by considering characteristics of site and laboratory test can be confirmed the characteristic of soil by testing with field samples. This article describes relative density as the measure of compaction for cohesionless soils and presents several simple and mathematical relationships to help engineers estimate needed parameters for relative density calculations. The main purpose of this research is to investigate possible correlations between coefficient of uniformity, coefficient of curvature, maximum and minimum void ratio, mean grain size. Results show a linear relationship between the minimum and maximum void ratios and a power function relationship between coefficient of uniformity and the limiting void ratios. Void ratio range, which is the difference between the maximum and minimum void ratios, appeared to be log normally distributed but showed no simple mathematical fit to the data. these results were shown to help engineers estimate needed parameters for relative density calculations.

• YAKHAK HOEJI
• /
• v.32 no.1
• /
• pp.26-39
• /
• 1988

Eudragit $RS^{\circledR}$ polymer was used as a wall material for the microencapsulation of aspirin by a phase separation method from chloroform-cyclohexane system with 5% polyisobutylene (PIB) in cyclohexane, and microcapsules obtained were evaluated by particle size analysis, scanning electron microscopy (SEM), drug release and drug stability test. With PIB as a coacervation inducing agent, smooth and tight microcapsules with less aggregation were obtained. Below 1 : 0.3 core-wall ratio, it was possible to coat individual particle. Variation of production conditions showed that increasing the proportion of wall material, particle size and wall thickness of microcapsules and the concentration of paraffin wax in cyclohexane as a sealant sustained drug release rates effectively. SEM confirmed that larger microcapsules after drug release did not rupture into smaller particles but contained a few small pores on the surface. Aspirin release from Eudragit $RS^{\circledR}$ coated microcapsules was independent of the pH of medium, and the mechanism of drug release from non-sealed and sealed microcapsules appeared to fit Higuchi matrix model kinetics. Aspirin in the mixture of aspirin microcapsules and sodium bicarbonate was by far more stable than that in the mixture of pure aspirin and sodium bicarbonate.

• The Research Journal of the Costume Culture
• /
• v.23 no.2
• /
• pp.326-336
• /
• 2015

The purpose of this study is to survey the wearing and purchasing situation related to brassieres between Korean and Chinese women and to analyze the differences among them. This study utilized a survey targeting 397 women in their 20's in Korea and China. The results were as follows: First, Korean women considered that their breasts are conical in shape, whereas Chinese women considered their breasts to have a flat shape. With regard to breast size, those of Chinese women are larger than those of Korean women. Moreover, Chinese women expressed a high rate of dissatisfaction with their breasts. Second, regarding the wearing condition of brassieres, while Korean women expected their brassiere to converge their breasts to the center, Chinese women expected their brassiere to support the breasts. It was found that many of them were dissatisfied with the shoulder straps and the center front wire. Third, in the results pertaining to the purchasing brassieres, although both Korean and Chinese Women mainly visited brand name stores to buy brassieres, compared with Chinese women, Korean women prefer to shop at home to buy the brassieres. In addition, they considered the compensation effect, size, activity, fabric and fit as the most important selection criteria when purchasing a brassiere.

• Journal of the Korean Data and Information Science Society
• /
• v.22 no.4
• /
• pp.735-740
• /
• 2011

In recent, electronic devices were able to develop and focus for ultra-compact size, intelligence, multifunction and broadband. Their SMPS is realized to ultra-compact size, light weight, high efficiency, high reliability, low noises. The power module which can be used to supply DC output from a commercial power supply (85 to 265 VAC). A switching power supply can be made easily by adding simply external circuit, such as microcontroller, a relay, etc. It would be apply to mostly electronic devices, and fit the global project "Saving energy". But we need to statistical analysis for a quality and performance about a load and an output voltage in product.

• Fashion & Textile Research Journal
• /
• v.1 no.3
• /
• pp.231-238
• /
• 1999

The purpose of this study was to identify characteristics and consumer attitude on purchasing apparel of Cable TV home-shopping viewer: A questionnaire was developed to measure watching attributes, consumers' attitude and actual purchasing condition of Cable TV home shopping, and demographic variables. The questionnaire was administered to 277 adult, and the data were analyzed by using frequency; crosstab, t-test, ANOVA. The results of this study were as follows: 1. main view time were 3~5 p.m. 11 p.m, 10~12 a.m. home shopping through Cable Tv. Women's main terms were afternoon, whereas men's main terms were night. Chiefly view program was about apparel and fashion items. The reason why they watched the home-shopping channel was to purchase more cheaper items. 2. Favor about Cable TV home-shopping was relatively affirmative, but purchasing intention through home-shopping was still negative. But affirmative response was gradually increasing a few years ago. 3. Purchasing experience through Cable TV home shopping was 61.0% and clothing purchaser within recently 6 months was 28.5% of total sample. Withspreading Cable TV widely; Cable TV home shopper was gradually increasing. Heavy purchasing items through Cable TV home-shopping were under-wear; muffler, shawl, because those items are standardized in size and style. When home shopping user made purchasing decision, the most significant factors were color; and size (fit), price in order of importance.

• Journal of the Korea Society of Computer and Information
• /
• v.18 no.10
• /
• pp.163-172
• /
• 2013

This study was conducted to explore a method of displaying optimized letters that fit the size of tables using a genetic algorithm. As a result, fonts with optimized letters of different lengths were offered through optimum values of the font size, line spacing, and letter spacing by calculating the width and height of the cell and number of letters to be entered. This study is significant in that it provides a solution to letter optimization issues in fixed cells that occur in various word processors that are currently used, through the genetic algorithm.

• ETRI Journal
• /
• v.33 no.2
• /
• pp.219-229
• /
• 2011

In this paper, we propose a transformation scheme used to analyze online gaming traffic properties and develop a traffic model. We analyze the packet size and the inter departure time distributions of a popular first-person shooter game (Left 4 Dead) and a massively multiplayer online role-playing game (World of Warcraft) in order to compare them to the existing scheme. Recent online gaming traffic is erratically distributed, so it is very difficult to analyze. Therefore, our research focuses on a transformation scheme to obtain new smooth patterns from a messy dataset. It extracts relatively heavy-weighted density data and then transforms them into a corresponding dataset domain to obtain a simplified graph. We compare the analytical model histogram, the chi-square statistic, and the quantile-quantile plot of the proposed scheme to an existing scheme. The results show that the proposed scheme demonstrates a good fit in all parts. The chi-square statistic of our scheme for the Left 4 Dead packet size distribution is less than one ninth of the existing one when dealing with erratic traffic.

• Advances in Computational Design
• /
• v.1 no.3
• /
• pp.235-251
• /
• 2016

We have performed a design optimization of a stiffened panel with curvilinear stiffeners using an artificial neural network (ANN) residual kriging based surrogate modeling approach. The ANN residual kriging based surrogate modeling involves two steps. In the first step, we approximate the objective function using ANN. In the next step we use kriging to model the residue. We optimize the panel in an iterative way. Each iteration involves two steps-shape optimization and size optimization. For both shape and size optimization, we use ANN residual kriging based surrogate model. At each optimization step, we do an initial sampling and fit an ANN residual kriging model for the objective function. Then we keep updating this surrogate model using an adaptive sampling algorithm until the minimum value of the objective function converges. The comparison of the design obtained using our optimization scheme with that obtained using a traditional genetic algorithm (GA) based optimization scheme shows satisfactory agreement. However, with this surrogate model based approach we reach optimum design with less computation effort as compared to the GA based approach which does not use any surrogate model.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.22 no.3
• /
• pp.312-319
• /
• 2011

In this paper, a new linearization algorithm for DPD(Digital PreDistorter) is suggested. This new algorithm uses DFP(Davidon-Fletcher-Powell) method. This algorithm is more accurate than that of the existing algorithms, and this method renew the best-fit value in every routine with out setting the initial value of step-size. In modeling power amplifier, the memory polynomial model which can model the memory effect of the power amplifier is used. And the overall structure of linearizer is based on an indirect learning architecture. In order to verify for performance of proposed algorithm, we compared with LMS(Least Mean-Squares), RLS(Recursive Least squares) algorithm.

• Proceedings of the Korean Institute of Interior Design Conference
• /
• 2008.05a
• /
• pp.155-158
• /
• 2008

Today, apartment is the primary housing type in Korea. In the past, there were many apartment floor plans in the same design way. There have been changes to complex and luxury plans in these days because people want to fit their own needs and wants to the plans. The primary purpose of this study is to analyze interior design trend of medium-large size apartment after year 2000. For that, this study used 7 different construction companies, 13 apartment complexes and 30 unit plan cases which were on sale from April 2007 to April 2008 in Seoul and the Metropolitan area. The results of analysis are as follows: First, most cases had 4LDK and 2bathroom with a dress-room. Second, characteristics of the interior design showed that the variety finish materials used in the units. For wall finish materials, wallpapers were used in mostly regardless in different areas. For floor finish materials, stone and tile were used in similar ratio in the entrance area whereas wood floor mostly was used in living room and kitchen areas. This study shows some significant characteristics of today's apartment even it has some limitations because of small amount of survey cases. More detailed and deeper study will be done continuously.