• Journal of Soil and Groundwater Environment
• /
• v.18 no.3
• /
• pp.11-22
• /
• 2013

SEAWAT, a linked modeling program of Visual MODFLOW was used to analyze the change in groundwater levels and salinity related groundwater dam construction in Cheongsan island, Wando-Gun, Jeollanam-Do. The steady-state model results show the groundwater flow and salinity distribution of the studied area. The groundwater flows from north-west and south-east highlands into the river, located in the middle part of the basin, and is eventually discharged to the ocean. Part of the sea water infiltrates into the river; and through the estuary's alluvium aquifer, the sea water intrusion takes place spreading to about 830 m from the ocean. The transient model results show that after the groundwater dam construction, groundwater levels will rise to a maximum of 2.0 m upstream, and the groundwater storage will increase 21,000 after 10 years. Meanwhile 31% of the total area affected by sea water intrusion will decrease. To conclude, the groundwater dam is a very useful method for a secure water resource in preparation for drought and water shortages in the island regions.

• The Transactions of the Korean Institute of Electrical Engineers P
• /
• v.66 no.3
• /
• pp.117-122
• /
• 2017

Due to the aging and obesity population in Korea, degenerative musculoskeletal diseases and people suffering from degenerative arthritis are increasing day by day. So, it is necessary to develop rehabilitation treatment device. Conventional high-frequency treatment devices have disadvantages in that therapeutic range is narrow, cost is high, image is adversely affected, treatment time is long, and failure rate is high. This paper proposes a customized therapy device that is stable and effective in reducing treatment time and output to target body part using 2MHz switching frequency, feedback control technique, and joint insulation flexible multipolar electrode. The device can be a new concept high-frequency stimulator to accommodate the advantages of CET and RET.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.4 no.3
• /
• pp.183-188
• /
• 2003

Non-molding and welding line happen by the assembly of gas at the connector terminal. There is not good phenomenon of burr by increasing the over injection pressure, the temperatures of die and resin to prevent from them. Therefore, the connector mold to apply the vacuum molding system is developed in this study. The vacuum pressure is controlled systematically with the optimum conditions in the important ingredients of injection molding that are the temperatures of melting resin and die and cooling condition. The badness in charging is cleared by making a vacuum to non-charging part of the deep bottom part of each cavity. And the vacuum system to reduce the cycle time is applied as the study envelopment of molding work. So, the good product and the productivity improvement can be obtained in this study.

• Journal of the Korean Society of Clothing and Textiles
• /
• v.19 no.1
• /
• pp.23-35
• /
• 1995

The purposes of this study were to investigate the schema of jeans and to investigate the relation between jeans schema and fashion jeans wear. The specific objectives were; 1) to investigate the schema of jeans and the schema of fashion jeans; 2) to investigate the relation between the schema of jeans wear and demographic variables.; 3) to investigate the relation between the schema of fashion jeans and demographic variables; 4) to investigate the difference of the schema of jeans from the schema of fashion Jeans. The moi or findings were: 1) The schema of jeans was composed of 5 factors; casual, comfort, indivisuality, economic, unisex . 2) The schem of fashion jeans was composed of 4 factors; popularity, indivisuality, comfort, casul. 3) The schema of jeans and fashion jeans was affected more by age and marriage than job and educational level. Especially age 30-34 were important parts in market segmentation strategy of jeans. 4) As compared with the schema of jeans and the fashion jeans concept, casual, comfort were important part in the schema of jeans and popularity, indivisuality was important part in the schema of fashion jeans. As the tendency of fashionable of jeans wear, consumers concept of jeans changed to popular, characteristic.

• Journal of the Korean Society of Clothing and Textiles
• /
• v.24 no.8
• /
• pp.1103-1114
• /
• 2000

The purpose of the study was to investigate the level and the major causes of job stress, and the causes of the high level of job turnover rate of fashion merchandisers and fashion designers. The study also examined the correlations among the major causes of job stress, job results and job turnover rate. A part of the questionnaire consisted of questions on major causes of job stress, job result, and intention and trial to leave a job. The subjects were to rate on 5 point Likert-type scales. The other part included the questions on demographic and individual characteristics of the subjects and their company characteristics. For the survey, the subjects were 99 fashion merchandisers and 128 fashion designers who are employed by mens or womens wear manufacturers. The SAS PC+ package was used to calculate frequency, Cronbach $\alpha$, multiple regressions. The results of the study were as follows: 1. The high degree of the job results were resulted from the high degree of specialties in their job characteristics, high contentment in human relations, career development and income, and low role conflict. 2. Stronger intentions and more trials to leave their job were correlated to better task performance in the workplace, lower commitment to their job, and lower job satisfaction. 3. Higher level of job stress caused by interpersonal relationship in the organization and contentment in career development and income affected stronger intentions and more trials to leave their job.

• Journal of the korean Society of Automotive Engineers
• /
• v.3 no.2
• /
• pp.18-26
• /
• 1981

The purpose of this paper is to study the possibility of practical use of gasoline-methanol mixed fuel as an alternative fuel of gasoline engines in the light of engine performances and harmful exhaust emissions as well as mixings and separations of the mixed fuels. When the methanol of 99.8% purity is mixed with super or regular gasoline available on the market today, the experimental results obtained without modifying carburetor in this study are as follows; 1.The separation ratio depends upon the gasoline-methanol mixing ratio only, regardless of fuel temperature and fuel additives for preventing separation of phase. 2.The critical absorption ratio is affected by the gasoline-methanol mixing ratio, its temperature and the quantity of fuel additives. 3.Concerning the distillation temperature, the initial point of all sorts of fuels is almost same,but 10% point and 35-60% point of mixed fuels are lower than those of gasoline only. 4.In case of throttle valve opening set, engine output using the mixed fuels is decreased compared to gasoline, but thermal efficiency is increased as a consequence of decreasing specific energy consumption. 5.In case of fixed load test, thermal efficiency is increased at low engine speed even under low part-load as well as under comparatively high part-load including full load. 6.CO and NOx emissions are reduced remarkably with the mixed fuels.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.21 no.6
• /
• pp.166-174
• /
• 2013

This study investigates the strength durability on the results of structural and vibration analysis due to the shape of excavator wheel. As model 2 has the least stress by comparing three models with maximum equivalent stress, model 2 has most durability among three models at static analysis. Maximum equivalent stress is shown at the bottom part contacted with ground and this part on wheel is most affected by load in cases of all models. Safety factor can be decided with the value of 2.3 by considering the yield stress of this model. The range of maximum harmonic response frequencies becomes 6900 to 7000Hz. As model 2 has the least total deformation and equivalent stress at these critical frequencies, model 2 has the most durability at vibration analysis among three models. The structural and vibration analysis results in this study can be effectively utilized with the design of excavator wheel by investigating prevention and durability against its damage.

• Journal of Welding and Joining
• /
• v.33 no.6
• /
• pp.60-66
• /
• 2015

Molten zone shape of pulse laser welding is affected by welding conditions such as beam power, beam speed, irradiation time, pulse frequency, etc. and is divided into conduction type and keyhole type. It is necessary to design heat source model for irradiation of laser beam in the pulse laser welding. Shape variables and the maximum energy density value of the heat source model are different depending on the molten zone shape. In this paper, pulse laser welding simulation for joining of cylindrical part and circular cover was carried out. The heat source model for pulse laser beam with circular path was applied to the heat input boundary condition, radiative and conductive heat transfer were considered for the thermal boundary condition. For each phase, thermal and mechanical properties according to temperature were also applied to analysis. Analytical results were in good agreement with the molten zone size of specimen under the same welding conditions. So, the reliability of the welding simulation was verified. Finally, the improvements for reducing residual deformation after cover welding could be reviewed analytically.

• Korean Journal of Materials Research
• /
• v.13 no.5
• /
• pp.323-327
• /
• 2003

Properties of nanoparticles synthesized during gas phase reaction were studied in terms of particle behaviors using real-time particle characterization method. For this study, $TiO_2$ nanoparticles were synthesized in the chemical vapor condensation process(CVC) and their in-situ measurement of particle formation and particle size distribution was performed by scanning mobility particle sizer(SMPS). As a result, particle behaviors in the CVC reactor were affected by both of number concentration and thermal coagulation, simultaneously. Particularly, growth and agglomeration between nanoparticles followed two different ways of dominances from coagulations by increase of number concentration and sintering effect by increased temperature.

• Journal of the Korean Home Economics Association
• /
• v.28 no.2
• /
• pp.1-14
• /
• 1990

The purpose of this paper was to examine the relationship between Surrealism and Schiaparelli's fashion design in the 1930s. Surrealism, derived from Dadaism, was based on Freud's analysis of dream imagery and human sexual behavior. Its style was characterized by the partial figure and the dislocation of body part, and the placement of the figure and its part in unanticipated settings. The objective of Surrealism was to exploit the unconsciousness and the interpretation of the body became an abiding. Surrealists were interested in the nature of clothing and in the specific characteristic of fashion, so, they moved into the world of fashion; fashion advertising window display and fashion photograph. The fantasy of Surrealism stimulated Schiaparelli to use wit and shock tactics, bold and unusual combination of colors, striking embroideries with crazy themes like circus and astrology. The character of her clothes was boldness and chic. She created humorous trompe-l'oel sweater, leg of mutton sleeve, tweed evening suit, shocking pink, peculiar accessories such as hats and buttons. She collaborated with many artists like Dali, Cocteau and Berard, and drew on all the latest artistic trends into the fashion arena from Cubism and African Art to Surrealism. Her Surrelist dress provided a play of illusions and affected today;s avant-grade style.