• Journal of Korean Society of Environmental Engineers
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• v.33 no.7
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• pp.530-535
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• 2011

In this work, the adsorption characteristic of the composites by adding loess with aluminum ("Al-loess") and Loess with lanthanum ("La-loess") which have been developed to effectively remove phosphorus, the substance which causes the eutrophic lake has been evaluated. According to the result of the work, as the amount of aluminum or lanthanum put in 1g of loess increases, the combined amount also increases accordingly. When the loess with no aluminum or lanthanum attached was used, the rate of removing phosphorus was different in comparison with the case of using the composites of 0.5, 1 and 2 mg of aluminum and 0.5, 1 and 3 mg of lanthanum in each gram of loess. It was observed the amount required to remove 1 mg $PO_4^{3-}$-P/L of phosphorus completely is approximately 2 to 10 times less for the composite of Al-loess than loess alone. Also, in case of the composite of La-loess, the amount was decreased by about 1.5 to 10 times. In order to observe the rate of adsorption phosphorus with Al-loess and La-loess, the composites were used for the observation up to three times by water washing. As a result, the water washing of the composite did not affect phosphorus removal. According to the effect of pH, there is a high rate of removing phosphorus in the pH range of 5~8. It seems that the developed composite will effectively remove phosphorus when it is spread in the natural water system. Also, since Al-loess and La-loess composites are rapidly precipitated within 30 minutes, it is stabilized quickly at the bottom of the eutrophic lake and becomes responsible for the removal of phosphorus in water and eluted from the water and the sedimentary layer.

• Environmental engineer
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• s.2
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• pp.18-19
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• 1986

• Journal of the Korea Organic Resources Recycling Association
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• v.26 no.1
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• pp.29-37
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• 2018

In this study, optimum extraction conditions for phosphorus recovery from sewage sludge ash(SSA) were investigated. For this purpose, an experiment was conducted to determine optimal recovery conditions for Ca-P type phosphorus by using calcium component in the recycled aggregate residue. The phosphorus content of sewage sludge ash was confirmed to be 5.0 %. When $H_2SO_4$ was used as an extract, concentration of 1 N $H_2SO_4$, L/S ratio of 10, and extraction time of 30 min were found to be the optimal extraction conditions. Phosphorus was extracted by using optimal extraction conditions, and then the heavy metals eluted with phosphorus were removed using 1~20 g of cation exchange resin. In 20 g of cation exchange resin, Fe 71.3%, Cu 82.4%, Zn 79.9%, and Cr 15% were removed. After that, the mixing ratio of the calcium extract obtained from the recycled aggregate residue (RAR) was changed to 1:1, 1:5, 1:10. The pH of the SSA to RAR mixture was adjusted to 2, 4, 8 and 12 by the addition of 5 N NaOH to the mixture of 1:5, and the phosphorus was recovered as Ca-P type precipitate. The optimum pH was 8. When recycled aggregate residues were used, the weight of calcium phosphate increased, but the amount of wastewater generated also increased. Therefore, it was concluded that the use of recycled aggregate residue was not economically feasible.

• 프린팅코리아
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• v.14 no.8
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• pp.102-103
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• 2015

한국출판인회의(회장 윤철호) 부설 교육기관인 서울북인스티튜트(원장 김태헌, SBI)가 개원 10주년을 맞아 지난 7월 10일 오후 2시 한국출판인회의 강당에서 '세계 출판 동향 분석' 이라는 주제로 특별강좌를 개최했다. SBI는 한국 최초의 출판전문 교육기관으로, 2005년 개원 이래 500여 명의 신규 출판인을 배출했고 1만여명의 출판인들에게 경력개발의 기회를 제공했다.

• Journal of Digital Convergence
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• v.17 no.10
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• pp.127-139
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• 2019

This study aims to explore the impressive experiences of university students on YouTube media and to find ways to improve personal media as useful consumer information. 44 university students were selected, and data on the experience of using YouTube were collected and analyzed by applying the critical incident technique. As a result, the positive responses to personal media were derived from 'enhancing C2C information capabilities', 'consumer-centric usability', 'attractive information creators', 'a sense of the sameness', and 'fresh and entertaining information'. Negative responses were derived from 'spreading of harmful information', 'distrust in information creators', 'inducing excessive advertising and impulse buying', 'media addiction' and 'relative deprivation'. In addition, improvement of the personal media has been suggested. This study has differentiation and significance as a qualitative data for understanding consumer's perception and experience of personal media.

• Journal of Digital Convergence
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• v.17 no.7
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• pp.15-26
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• 2019

The purpose of this study is to provide meaningful implications for the establishment and implementation of social welfare policies for one-person households and to investigate the structural relationship between social participation and social support of one-person householders on their quality of life. As a result of the analysis, it was found that there was a positive correlation between the three variables. The direct and indirect effects of social participation on the quality of life were significant, and the social support partially mediated the relationship between social participation and quality of life. Therefore, it will be necessary to establish a welfare policy system that can promote social support by improving the quality of life of one-person households by providing concrete and diverse ways to activate social participation. Subsequent researches should be dealt with a more in - depth qualitative research on the concrete realization of this.

• Journal of Convergence for Information Technology
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• v.9 no.6
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• pp.146-152
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• 2019

This study discussed implications of the increase of single person households (SH) for high-tech industries especially focusing on artificial intelligence (AI) adopted products, based on critically reviewing the past researches on their characteristics including consumption trends; the improvement of AI technology; and its market potentiality in various industries. According to the results, SH spent more time with others like friends and neighbors more than couples. Younger people increasingly chose to live alone by their own free will for achieving their goals. 'Living alone' or 'going solo' is not thought negatively any more, but as a new market power in the future. Considering their value oriented consumption behaviors based on spirit of independence and individualism, they will need high-tech products more like AI adopted products than others because of their advantages for the value of single life. Thus, the rapid progress of AI technology is predicted to bring them satisfaction of their wants and it is suggested to prepare for the market segmentation of SH as AI end-users.

• Korea Science and Art Forum
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• v.34
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• pp.133-148
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• 2018

Korea's housing structure is predicted that one-person housing will be the most common type of housing in Korea. Therefore, this study intends to derive contents for designing a one-person housing space considering the life of a rapidly increasing one-person householder. For this purpose, this study objectively derives the social, economic and cultural influencing factors of one-person households through big data analysis, and analyzed the correlation between contents using social network analysis methodology. In this paper, 60 core contents related to one person housing space were derived by applying big data analysis methodology. And through social network analysis, the most influential contents were derived from the space editing and space composition categories. This means that the residential space is an important part of the design idea that can flexibly respond to changes in the user's life. Based on this study, future research will focus on the concept and design methodology of one-person housing space.

• Journal of Sasang Constitutional Medicine
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• v.6 no.1
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• pp.127-129
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• 1994

체질인류학의 인체측량방법을 사상의학의 변상진단학에 응용하여 연변조석족 성인 300명 (남:149명, 여:151명) 두면부의 27개 항목을 측량하고 태음인, 소양인과 소음인의 부동한 측량항목의 평균치, 상지간차이(象間差異) 및 4개의 주요한 지수(指數)를 계산하여 태음인, 소양인과 소음인의 활체측량성체질특점과 지수성체질특점을 탐색하려 시도하였다. 그 결과 태음인의 두연형태는 비교적 크고 남자 소음인의(면부(面部)) 형태는 비교적 좁고 길며(착장(窄長)) 여자 소양인의 입술은 비교적 두꺼웠다.

• Proceedings of the KIPE Conference
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• 2011.07a
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• pp.520-521
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• 2011

인버터의 병렬운전은 인버터간의 특성, 선로임피던스 차이, 각 구성품들의 오차 등으로 인해 적정한 제어가 되지 않는 경우 인버터간의 순환전류가 발생하여 인버터의 무효전력 부담이 증가하여 전체 전력 시스템의 용량을 감소시키게 된다. 본 논문에서는 4병렬 인버터의 병렬제어 알고리즘으로서 전압지령치와 주파수지령치의 regulation 성능이 좋은 동기좌표계 droop 제어기법을 적용한 1.2MW급 연료전지용 EBOP를 제안한다.