• Journal of Convergence for Information Technology
• /
• v.9 no.4
• /
• pp.100-108
• /
• 2019

The purpose of this study is to analyze the influence of university students' dependence on smart-phone on career attitude maturity and the mediating effect of interpersonal problem in the analysis path. For this purpose, the study implemented a survey on students of universities in Seoul and Gyeonggi-do area and carry out a structural equation for empirical verification with a total of 218 copies. As a result, first, high level of daily life disturbance and virtual world orientation of university students, have a positive effect on interpersonal problems. Second, high level of daily life disturbance and virtual world orientation of university students, have a negative effect on career attitude maturity. Third, interpersonal problems of college students had a negative effect on career attitude maturity, and they were found to be fully mediated in relation to smart-phone dependence and career attitude maturity. Therefore, this study suggests that it can be used as a basic data for the development and application of various programs promoting the career attitude maturity of university students.

• Journal of Convergence for Information Technology
• /
• v.9 no.10
• /
• pp.133-143
• /
• 2019

The purpose of this paper was to analyze the differences in executive function according to type of early English learning experience. The subjects were 75 5-years-old who had immersive early English learning in language school, and daycare center. The measurement tools were stroop, DCCST, memorize numbers, pattern fluency, and maze. We conducted covariance analysis with total intelligence as the covariates. In the results, there were significant differences in attention control and cognitive flexibility, but weren't significant differences in information processing and goal setting according to type of early English learning experience. This study suggests that experience of immersive early English learning positively affected attention control and cognitive flexibility, and didn't affect information processing and goal setting.

• Design & Manufacturing
• /
• v.14 no.4
• /
• pp.17-24
• /
• 2020

Products for heating indoors in low temperature and dry winter are largely divided into products using fossil fuels and products using electricity. The fossil fuels can warm the entire space by convection, but there is a high risk of fire and the frequent ventilation due to the increase in carbon monoxide and carbon dioxide. Heaters using electricity are mainly used because they are convenient to use and are cheap. However, these products can not efficiently warm the air because they use radiation energy. In other words, only the front part exposed to the heater is warm, and the rear part has no heating effect at all. Also, because it emits a large amount of light, fatigue of the eyes is very high. Another problem is that when using electric heaters, the room tends to be dry by high heat. Indoor humidity maintenance is a very important factor in the prevention and treatment of respiratory diseases. Especially, it is essential for health care for infants, bronchial organs and people with weak respiratory because humidity is low in winter. In this study, we conducted a study to develop a product that can improve heating efficiency while maintaining proper indoor humidity by combining heat energy and moisture particles. The concept of humidification and heating at the same time, moisture particles generated in the humidifier pass through the heater, include thermal energy, and the moisture particles with thermal energy are diffused into the space by forced convection, thereby warming the entire space. In addition, the heating time is shortened as the feeling temperature is increased with the high relative humidity, and this has the effect that the heating cost in winter is reduced.

• Korean Journal of Culture and Social Issue
• /
• v.26 no.2
• /
• pp.69-97
• /
• 2020

The purpose of this study is to explore female office worker's bullying experience in the workplace and derive the essential meaning of the experience. For this study, five female workers who experienced workplace bullying were interviewed in-depth and the collected data were analyzed by the method of descriptive phenomenological research of Giorgi. The research questions in this study are 'How do female workers experience bullying in the workplace?' and 'What does it mean to experience bullying in the workplace?' The result of this study is indicated 5 main themes and 19 sub-themes. The 5 main themes are as followed: 'tactfully bullied by perpetrators perceived as a stumbling block', 'struggling with the suffering', 'trying to stand up in a frustration', 'getting a new perspective looking back on herself as a woman', 'being left in the maze, unable to discern who was wrong'. Furthermore, the study suggested common and core elements of female worker's bullying experience, and proposed a generic framework of the relationship among the elements. Finally, discussions and implications applicable to counseling were presented.

• Journal of Korea Entertainment Industry Association
• /
• v.15 no.6
• /
• pp.15-22
• /
• 2021

This study is aimed at suggesting a direction for the development of sensuous and creative art mask design by making art masks rooted in the aesthetic characteristics of psychedelia. The conceptual definition and characteristics of psychedelia were identified on previous studies, specialized books and works of art. The characteristics of psychedelia based on theoretical research were limited to illusionism, abstraction, play, and dynamism, which are often used in researcher's work, and four research works were produced by combining them with art mask design. By trying to diversify works regardless of form or tradition, this study could make the infinite creation of art mask possible and transform that into a new modern beauty. In addition, by expressing internal meaning along with external characteristics in the design of works, it could bring the establishment of a new perception and value of art mask. In the future, it is hoped that this study will be used as basic data for follow-up research related to art mask design and be helpful in the development of art mask design.

• Journal of The Korean Association of Information Education
• /
• v.25 no.6
• /
• pp.987-994
• /
• 2021

Computational Thinking is an analytical thinking ability that is necessary for everyone and everywhere. The existing Computational Thinking development education provided in Practical textbooks leads to block-based programming languages from unplugged activities. Many unplugged activities focus on practicing sequential order, which may lack the learning of abstractions or automation concepts. In block-based programming languages, concepts such as coordinate planes, which are not introduced in elementary school curriculum, appear, making students feel burdened by the block-based programming language itself. In this study, a curriculum was designed for elementary student's computational thinking through game-based programming language education. The results and their effectiveness were analyzed through the beaver challenge. As a result of analyzing the pre-test and post-test scores, it was confirmed that students' computational thinking skills improved.

• Journal of the Korean Society of Groundwater Environment
• /
• v.5 no.3
• /
• pp.148-154
• /
• 1998

Gubong gold-mine, previously one of the largest gold mines in Korea, is located at the mid-west of the South Korea. In the areas nearby the mine, the shallow groundwater was the major source for domestic and farming water-supply. Soil contamination by Cd, Cu, Pb and Zn was previously known in this area. This study is objected to identify quality of the shallow groundwater, possibly affected by the mine tailings. Samples were collected from a nearby stream, shallow groundwater and seepage from the tailings. Chemical analysis for the water quality includes major cations such as Na, K, Ca, and Mg, anions as F, Cl, NO$_3$, SO$_4$, HCO$_3$, and trace elements as Al, Cr, Mn, Fe, Ni, Cu, Zn, Cd, Pb, Se, As, Hg. Water types could be drawn into four groups from the plots of Piper, Stiff diagrams and cluster analysis. SAR-Conductivity plot indicates the water does not pose either alkalinity or salinity hazards for irrigation. Major contaminant in groundwater appeared to be arsenic, released from arsenopyrites in tailings by oxidation. Dredging of buried railing materials could stimulate the release of arsenic from the sediments to the groundwater.

• Economic and Environmental Geology
• /
• v.39 no.6 s.181
• /
• pp.699-710
• /
• 2006

Batch scale experiments to investigate the efficiency of the solidification process for metal mine tailing treatment were performed. Portland and MSG (micro silica pouting) cements were used as solidifier and three kinds of mine tailings (located at Gishi, Daeryang, and Aujeon mine) were mixed with cements to paste solidified matrices. Single axis com-pressible strengths of solidified matrices were measured and their heavy metal extraction ratios were calculated to investigate the solidification efficiency of solidified matrices created in experiments. Solidified matrices ($5cm{\times}5cm{\times}5cm$) were molded from the paste of tailing and cements at various conditions such as different tailing/cement ratio, cement/water ratio, and different cement or tailing types. Compressible strengths of solidified matrices after 7, 14, and 28 day cementation were measured and their strengths ranged from 1 to $2kgf/mm^2$, which were higher than Korean limit of compressible strength for the inside wall of the isolated landfill facility ($0.21kgf/mm^2$). Heavy metal extractions from intact tailings and powdered matrices by using the weak acidic solution were performed. As concentration of extraction solution for the powdered solidified matrix (Portland cement + Gishi tailing at 1:1 w.t. ratio) decreased down to 9.7 mg/L, which was one fifth of As extraction concentration for intact Gishi tailings. Pb extraction concentration of the solidified matrix also decreased to lower than one fourth of intact tailing extraction concentration. Heavy metal extraction batch experiments by using various pH conditions of solution were also performed to investigate the solidification efficiency reducing heavy metal extraction rate from the solidified matrix. With pH 1 and 13 of solution, Zn and Pb concentration of solution were over the groundwater tolerance limit, but at pH $1{\sim}13$ of solution, heavy metal concentrations dramatically decreased and were lower than the groundwater tolerance limit. While the solidified matrix was immerged Into very acidic or basic solution (pH 1 and 13), pH of solution changed to $9{\sim}10$ because of the buffering effect of the matrix. It was suggested that the continuous extraction of heavy metals from the solidified matrix is limited even in the extremely high or low pH of contact water. Results of experiments suggested that the solidification process by using Portland and MSG cements has a great possibility to treat heavy metal contaminated mine tailing.

• Korean Journal of Mineralogy and Petrology
• /
• v.33 no.1
• /
• pp.41-51
• /
• 2020

The purpose of this study was to investigate the possibility of eco-friendly/efficient recovery of valuable resources, such as Au from mine tailings, which are environmental pollutants in the Mongolian mine sector. For this purpose, this study selected 4 place of mine tailings of the Mongolian mines sector and carried out mineralogy evaluation of the valuable resources in the tailings. In this study, flotation was performed to separate and concentrate valuable resources in the tailings. Microwave nitric acid leaching was used to leach the valuable resources contained in the sample and to improve the Au grade. Chloride leaching attempted to leach Au from the leaching residues. XRD analysis of the tailings samples showed that most of the samples consisted of silicate minerals. As a result of confirming the content of the element through XRF analysis, the SiO₂ content was very high, the Fe₂O₃ content was 2.32-4.23%, and the content of PbO, CuO and ZnO components were all within 2%. As a result of flotation for the tailings samples, the recovery of Au was the highest in Bayanairag sample (95.38%). As a result of microwave nitric solution experiment on Au concentrate sample obtained by flotation, the content of Au in the microwave nitrate leaching residue increased by 12.15% from 192.72 g/ton to 216.14g/ton in Khamo sample, the highest increase was 57.58% in Bayanairag sample. TCLP tests on tailings generated after flotation showed dissolution characteristics within EPA. Chloride leaching test was performed to recover Au from solid residues. The leaching rate was 87.43-89.35% within 10 minutes. For Khamo sample, 100% Au was leached after 60 minutes of leaching time. Therefore, in order to process the tailings continuously generated in Mongolia, applying the same process as the present study is expected to effectively recover the valuable resources contained in the tailings.

• Journal of the Korean Geographical Society
• /
• v.31 no.3
• /
• pp.593-612
• /
• 1996

This study concern with the changes of street from the Choseon Dynasty to present days around Old-Boundary in Taegu, analyzing the backgrounds of change factors and development trends of the Taegu City. The basis element of a city structure is the street. Therefore, in this study, a chage of street space of a city was investigted. Historically, Taegu was a walled city and had a Mono-nucleus which was restricted by the castle, and served as a starting point of formation of spatial structuure. The form of the artery street took a "T" pattern, othe streets were formed in irregular shapes. As the city grew gradually, the castle was removed on account of diversification in traffic network, change of socio-economic organization in traffic network, change of socio-economic organization, formation of industrial bases and functional distribution. CBD of this city has been located within the area surrounded by these streets. This is a kind of general pattern of traditional walled cities through the world in both Western and Oriental societies. A s the begining of this centry, a 'Dark Ages' descended upon Korea because the country was under the Japanese-Korean Annexation, and, throughout this period, the urban planning was planned exclusively for Japanese. The street pattern within residential areas of Korea took the maze type, in contrast with Japanese residential areas which showed grid pattern of streets. This is another general pattern of almost of all colonial cities especially in Asia. High class residential areas were planned and built by Japanese, and they were located within 5-10 minutes' on-foot distance from the CBD hard core. This high prestige has continued until the 1980s when it occurred land use succession which commerical functions invaded into residential areas. Back in the colonial period, there was a between two hetrogeneous groups due to the fact that the Japanese lived mainly oriented the new railway system but that Koreans still lived along the old highway system which ran through the Korea Peninsula. Street netwook formed in the above process has maintained its shape without great changes after the liberation form the Japanese Colony. Taegu has, accordingly, developed ring-radial network system which has been a combination of radial and ring facilities. The present conditions of street patterns in Taegy mainly depend on 4 rings and 8 radius, with grid pattern street able to be found in Old Boundary.