• 유기물자원화
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• 제23권2호
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• pp.61-66
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• 2015

본 연구에서는 도시농업조성을 위한 텃밭재배용 용토의 제조실험 및 이를 통한 상추의 생육실험을 진행하였다. 용토의 제조를 위한 최적의 원료배합비율은 이탄, 축분, 코코피트, 제올라이트, 미생물제제를 각각 49 : 35 : 10 : 5 : 1(w/w)로 혼합한 비율에서 pH, 전질소, 가용인산, 양이온, 염분함량 등이 적합한 비율로 나타났으며, 상추를 이용한 생육실험결과, 대조구와 비교하여 엽장과 엽폭은 각각 21%와 20%, 클로로필 함량은 17%, 생체중은 22%까지 증가하는 것으로 나타났다.

• 기본간호학회지
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• 제12권1호
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• pp.101-112
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• 2005

Purpose: To investigate the status of health education courses in elementary schools. Method: From September to December in 2003, 607 school nurses were surveyed by questionnaires. Results: 1) Of the schools, 32.1% had health education programs as part of the school health service. A higher proportion was found in schools in suburban and rural areas. Mass media in health education was used by 75% of school nurses. Regular classes were more frequently utilized in schools in rural areas, while the classes in health-related subjects were utilized in urban areas. For 20.6% of school nurses, there was a substitute person to provide health care while the nurse was in health education classed, but 94.2% of school nurses found they had to give up health education due to pressure from other health services. 2) Of the nurses, 97.0% felt the need to provide health education courses, but 60.6% insisted that their work load needed to be modified and supplemental personnel were necessary if health education courses were to be provided. 3) More than 30% school nurses responded that educational materials and media, and concern by teachers and administrators were insufficient. 4) School nurses suggested that the content for health education courses should include healthy life and dental health care for students in lower grades, dental health care, sex education and safety for students in middle grades, and sex education and drug abuse prevention for students in higher grades. Conclusion: There is an urgent need to provide health education courses in elementary schools but conditions in the schools are not satisfactory. For successful school health services, personnel supplement, modified work loads and sufficient educational materials and media should be in place before health education courses are provided.

• 한국응용과학기술학회지
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• 제32권1호
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• pp.7-15
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• 2015

In this study, the thermal treatment yam (Dioscorea batatas DECNE.) was analyzed for its proximate and nutritional compositions including mineral, vitamin, amino acids and fatty acids. Thermal treatment yam is mainly consisted of carbohydrate (70.3%) with small amounts of crude protein (15.8%), crude ash (5.1%) and crude fat (1.6%). It was found to be a good source of essential minerals such as K (1100.2 mg/100 g), Mg (99.4 mg/100 g), Ca (54.8 mg/100 g) and Na (44.9 mg/100 g) but Zn (4.8 mg/100 g) and Fe (0.2 mg/100g) content was low. Little amounts of vitamin E (8.3 mg/100g), vitamin C (3.5 mg/100g) and vitamin B1 (2.1 mg/100g) could be found. The amino acid analysis revealed that the yam was superior with respect to serine (1454.2 mg%), lysine (684.6 mg%) and histidine (684.6 mg%). Essential amino acids were calculated to be 2849.3 mg%. The amino acid profiles showed that thermal treatment yam is limiting in isoleucine and phenylaline. Linoleic acid was the most predominant fatty acids with the value of 47.3% followed by palmitic acid (24.7%) and oleic acid (12.7%). And the unsaturated fatty acids including oleic acid and linoleic acid were present in big quantities in thermal treatment yam.

• 한국응용과학기술학회지
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• 제32권1호
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• pp.127-135
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• 2015

The aim of this study was to investigate the antioxidant activity of thermal treatment yam (Dioscorea batatas DECNE.) in Korea. Thermal treatment yam was extracted by different solvents including 70% methanol, 70% ethanol and chloroform-methanol mixture (CM, 2:1, v/v). Then color property, total phenol content and antioxidant activity were analyzed. Yam possessed high $L^*$ value and $H\limits^{\circ}$ value, which were $54.92{\pm}2.18$ and $73.20{\pm}0.77$, respectively. Thermal treatment yam exhibited great antioxidant activity evaluated by ABTS [2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt] radical scavenging activity, DPPH (2,2-diphenyl-1-picrylhydrazyl) radical scavenging activity, reducing power, and ferric reducing antioxidant power. Total phenol contents of various extracts from thermal treatment yam increased in the following order: 70% methanol extract ($63.53{\pm}0.33mg\;CAE/g$), 70% ethanol extract ($69.47{\pm}1.00mg\;CAE/g$) and CM extract ($97.49{\pm}0.66mg\;CAE/g$), respectively. The same trend was also could be found in antioxidant activity assays except for reducing power assay. These results implied that these extracts from thermal treatment yam might be useful to take a good part in prevention of human diseases and aging.

• 한국건설순환자원학회논문집
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• 제2권1호
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• pp.10-18
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• 2014

본 연구에서는 시멘트와 광물질혼화재인 고로슬래그미분말과 플라이애쉬를 미리 혼입한 Premixed Cement를 사용한 콘크리트와 수축저감제가 혼입된 3성분계 콘크리트, OPC 100%의 콘크리트에 대하여 기초물성 평가로 공기량, 슬럼프, 압축강도 및 건조수축 시험을 수행하고, 수화열 해석을 수행하여 Premixed Cement를 사용한 콘크리트의 현장 적용성을 검토하였다. 검토결과 Premixed Cement를 사용한 콘크리트는 목표 작업성 및 설계기준압축강도를 충분히 만족하며, 건조수축 측면에서도 수축 저감제를 혼입한 3성분계 콘크리트와 유사한 건조수축 특성을 나타내었다. 또한, 수화열 해석 결과 Premixed Cement를 사용한 콘크리트는 목표 온도균열지수를 충분히 확보할 뿐만 아니라, 수축 저감제를 혼입한 3성분계 콘크리트보다 경제성을 확보할 수 있는 방안으로 도출되었다. 향후 매스콘크리트구조물 시공에 있어 구조물의 내구성능 및 유지관리 편의성 향상을 위해 Premixed Cement를 사용한 콘크리트의 현장적용은 바람직한 것으로 판단된다.

• Environmental Engineering Research
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• 제25권4호
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• pp.536-544
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• 2020

To address organic dye wastewater, economic and effective adsorbents are required. Here, magnetic biochar from alkali-activated rice straw (AMBC) was successfully synthesized using one-step magnetization and carbonization method. The alkaline activation caused the large specific surface area, high pore volume and abundant oxygen-containing groups of the AMBC, and the magnetization gave the AMBC a certain degree of electropositivity and fast equilibrium characteristics. These characteristics collectively contributed to a relative high adsorption capacity of 53.66 mg g^-1 for this adsorbent towards rhodamine B (RhB). In brief, RhB can spontaneously adsorb onto the heterogeneous surface of the AMBC and reach the equilibrium in 60 min. Although the initial pH, ionic strength and other substances of the solution affected the adsorption performance of the AMBC, it could be easily regenerated and reused with considerable adsorption content. Based on the results, H-bonds, π-π stacking and electrostatic interactions were speculated as the primary mechanisms for RhB adsorption onto the AMBC, which was also demonstrated by the FTIR analysis. With the advantageous features of low cost, easy separation, considerable adsorption capacity and favorable stability and reusability, the AMBC would be a potential adsorbent for removing organic dyes from wastewater.

• 유기물자원화
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• 제13권4호
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• pp.79-88
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• 2005

농어촌에서 발생하는 폐기물을 소각하는 최적의 소각로의 필요성이 대두된다. 농어촌에서 발생하는 수분이 다량으로 함유된 음식물 쓰레기나 폐비닐 또는 어촌에서 사용하고 남은 폐 그물 등은 그 처리에 더 큰 어려움을 겪고 있다. 또한 농어촌 폐기물의 성상분석 결과 도시의 폐기물과 마찬가지로 고열량을 가지고 있기 때문에 그에 맞는 설계도 고려대상이 된다. 본 연구에서는 농어촌 폐기물을 A, B지역으로 나누어 물리 화학적 조성 및 발열량 등을 비교 분석하고, Lab Scale의 연소로를 이용하여 농어촌 폐기물의 유해가스 발생량에 대하여 각각 20회에 걸쳐 실험하였다. 특히 농어촌 지역 특성상 발생하기 쉬운 폐비닐, 폐 그물에 중점을 맞추어서 조사하였으며, 그에 따른 폐기물의 배출현황 및 시료를 채취하여 성분을 분석하였다. 연구결과 농어촌 폐기물 특성상 발생하기 쉬운 폐 그물 이나 폐비닐 등의 합성수지계의 폐기물로 인해 발열량이 도시와는 1,000~1,900kcal/kg 가량의 큰 차이를 보였다. 이를 효과적으로 소각하기 위해서는 열분해 소각방식이 가장 적합하다는 결론을 얻게 되었다.

• 한국의상디자인학회지
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• 제21권4호
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• pp.181-194
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• 2019

The purpose of this study is to analyze the problems associated with the domestic fashion sewing industry and suggest solutions for re-development. The research methods are a content analysis of literature, including articles and reports, and interviewing practitioners who are in charge of the fashion industry. The problems of the domestic fashion sewing industry are as follows. 1. Weakness in price competitiveness and a lack of work. 2. Aging of workers and difficulty securing new workers. 3. The age of the production facilities and the lack of manpower required for mass production. 4. Unrealistically low cost of labor due to over-competition considering the lack of work.5. The prevalence of illegal label grinding. The solutions to the problems listed above are as follows. 1. Establishment of a win-win effort between fashion brands and sewing companies. 2. Allow systematic education, support, and development of a meister system for fostering sewing manpower. 3. Undertake efforts to improve the sewing work environment. 4. Establishment of the system for realizing the actual cost of labor. 5. Establishment of a quota system to secure domestic sewing production. 6. Construction of Smart DB to connect work orders. 7. Construction of a smart factory using technology such as automated systems of production suitable for the 4th Industrial Age. 8. Enforcement of specialized strategies to encourage fashion sewing companies, not only Seoul but also in other urban areas.

• Plant Biotechnology Reports
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• 제5권3호
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• pp.283-287
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• 2011

In order to produce centellosides from whole plant cultures of Centella asiatica (L.) Urban, we evaluated the synergistic effects of thidiazuron (TDZ) and methyl jasmonate (MJ) on whole plant growth and centelloside production. After 4 weeks of treatment with 0.025 mg/L of TDZ coupled with 0.1 mM MJ, the production of made-cassoside and asiaticoside from whole plant cultures was estimated to be 2.40- and 2.44-fold, respectively, above that of MJ elicitation alone. When whole plants were treated with a growth regulator and an elicitor, the growth of whole plants, as compared to the controls, did not differ. Additionally, total phytosyterol content in the leaves of whole plants co-treated with MJ and TDZ was 1.08-fold greater than those of MJ alone. These results demonstrate that combined treatments not only stimulate the accumulation of centellosides in the leaves but also inhibit the reduction of phytosterol levels caused by MJ elicitation.

• Ocean Science Journal
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• 제40권3호
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• pp.127-143
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• 2005

The taxonomic sufficiency approach has been proposed as a surrogate for the typical analysis of species-abundance data, especially in conditions involving prominent pollution gradients. Here, we evaluate the use of taxonomic sufficiency with infralittoral macrobenthic data derived from samples taken in a moderate polluted subtropical environment in southeastern Brazil, analysing five taxonomic levels and including two functional levels throughout polychaete feeding guilds and trophic groups. The data were collected seasonally at nine stations and studied for two abundance data series (0.5 and 1.0 mm sieve mesh-size). The results showed a similar ordination pattern between the two sieve mesh-size, but with the 0.5 mm sieve data a different pattern was observed during austral summer. A slight loss of information was detected using genus, family, polychaete species and their feeding guilds as taxonomic/functional units. These results together with those of the cost! benefit ratio, suggested that the family level seemed to be sufficient to detect the impact caused by moderate pollution in this shallow-water, subtropical environment. In additional, through the use of feeding guilds, similar patterns are obtained. Correlation analysis showed that chlorophyll a, total organic matter, zinc, and chromium sediment content were the variables that best explained the biological pattern observed and not always the best correlation coefficient occurring at the species level. The feeding guild approach seems to be useful and generates interpretable results similar to those obtained with the species level of the whole macroinfauna. The results showed an important cost reduction in the sample processing, suggesting that it is possible to adopt a coarser taxonomic level monitoring program even in species-rich communities.