• 한국육종학회지
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• 제40권3호
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• pp.303-307
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• 2008

출수가 늦어 남해안 일부 지역에서만 재배되던 재래종 녹미(일명; 생동찰벼)를 개량하여 전국적으로 안전하게 재배할 수 있도록 신품종 "녹원찰벼"를 육성하였다. 생동찰벼의 종자에 감마선 200 Gy를 조사하여 $M_2$세대에서 출수가 빠르고 키가 작은 우량 계통을 선발하였다. 계통선발과 지역적응성 시험을 거쳐 유망계통 원농 17호(녹원찰벼)를 최종적으로 선발하여 품종등록하였다. 녹원찰벼는 생동찰벼와 비교하여 중부지방에서 이삭 피는 시기가 생동찰벼보다 15일정도 빠른 8월 17-20일경이었고 간장은 15 cm 정도 작은 91 cm이었다. 녹원찰벼의 현미 수량은 생동찰벼보다 10% 정도 증가하였다. 녹원찰벼의 백미 및 현미중의 아미노산 함량은 다른 대조 품종보다 10-60% 높았다. 엽록소 함량은 대조품종 신선찰벼 및 남평벼보다 비해 2배 높았다. 등숙기에 엽록소 소실이 늦어 녹색 현미 찹쌀로 이용이 가능하여, 일반 쌀에 섞거나 현미밥을 지으면 연한 황록색의 시각적인 효과와 고소하고 차진 특성이 있다. 병해충에도 강하여 앞으로 친환경 기능성 쌀로 이용확대가 기대된다.

• 한국조경학회지
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• 제42권3호
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• pp.1-12
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• 2014

도시의 공원녹지는 지역 주민들의 신체활동과 건강증진을 위해서 중요한 역할을 담당할 수 있기 때문에, 본 연구에서는 공원녹지의 다양한 특성과 신체활동 및 건강증진 목적의 공원녹지 이용의 상호관련성을 분석하고자 한다. 설문조사는 경상남도 창원시에 거주하는 541명의 주민들을 대상으로 공원녹지의 이용패턴과 주관적인 근린환경 인식을 파악하기 위해서 실시하였다. 사례지역에 대한 공원녹지의 접근성과 물리적 근린환경에 대한 공간정보를 구축하기 위해서 지리정보시스템(GIS)을 이용하였다. 다중회귀분석은 공원녹지의 특성과 신체활동 목적의 공원녹지 이용횟수, 자가인식 건강수준, 그리고 체질량지수(BMI)와의 상호관련성을 규명하기 위해 수행하였다. 거주지로부터 200m 이내에 분포하는 공원녹지의 출입구와 공원의 개수, 집 주변에서 운동하는 사람을 많이 볼 수 있거나, 저렴하게 이용할 수 있는 운동시설이 많다고 느낄수록 신체활동의 증가에 긍정적인 영향을 미치는 것으로 나타났다. 집 주변 공원녹지까지의 거리가 가깝고, 공원녹지의 개수가 많고, 면적이 넓을수록, 보행이 편리할수록, 공동주거지역의 비율이 높을수록 자가인식 건강수준(perceived health level)에 긍정적인 영향을 미치는 것으로 나타났다. 거주지로부터 400m 이내에 분포하는 공원녹지의 개수, 보행환경의 안전성, 공동주거지역의 비율, 도로비율, 교차로 밀도 등이 BMI와 상호관련성이 있는 것으로 나타났다. 독립변수인 공원녹지의 특성과 종속변수인 신체활동 목적의 공원녹지 이용횟수 및 자가인식 건강수준 사이의 다중회귀분석 결과, 유의수준 10% 이내에서 의미가 있는 회귀모형이 도출되었다. 본 연구는 공원녹지와 근린환경의 특성이 지역주민들의 신체활동과 건강에 미치는 영향을 규명함으로써, 향후 신체활동 목적의 공원녹지의 이용을 증진하고 비만을 감소시키기 위한 목적의 조경계획을 수립하는데 활용 가능할 것이다.

• KIEAE Journal
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• 제17권4호
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• pp.75-81
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• 2017

Purpose: Most contemporary office buildings supply external views, a sense of openness and a sense of time to their occupants by adopting the curtain walls, which are equipped with an outer cover having large window area. As a result, the amount of radiation increases, adversely affecting cooling load during the summer in office buildings. Although solar radiation decreases heating load and reduces energy costs during the winter period, due to the characteristics of offices where occupants work largely during daytime, the cooling load is important compared to the heating. Therefore, diverse measures to resolve those trade-offs and annual energy cost have been investigated. Method: In this study, the annual thermal load was comparatively analyzed according to the slat angle of the venetian blind along with lighting control technique. Result: After selecting effective conditions, in order to resolve such issues, this study established automated control strategies of slat angle depending on the window-to-wall ratio and zone orientation, so that the findings of this study can be effectively generalized to other circumstances.

• 대한지역사회영양학회지
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• 제7권6호
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• pp.803-813
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• 2002

The purpose of this study was to investigate the anthropometric and blood biochemical characteristics, the dietary behaviors and health-related lifestyles of obese children in Incheon. A cross-sectional survey was conducted using anthropometric measurements, biochemical assessments and questionnaire analysis. The subjects included 7,055 obese children residing in the Incheon area (from 106 elementary schools). The degree of obesity was classified using the Obesity Index (OI) as light 20% ＜ OI ＜ 30% ; Medium 30% ＜ OI ＜ 50% ; Severe 50% ＞ OI. The statistical analysis was conducted using SPSS 10.0 program. Most subjects fell within the medium range of obesity. Most subjects had dietary problems such as overeating, unbalanced meals and skipping breakfast. The ratio of boy subjects eating green and yellow vegetables was lowe. when compared to that of the girl subjects. The boy subjects exercised more frequently and longer than the girls. As the Obesity Index increased, hypercholesterolemia significantly increased. The blood cholesterol levels of the subjects were positively correlated with body fat, waist/hip ratio and BMI; HDL cholesterol levels of the subjects were negatively correlated with the anthropometric data and the LDL cholesterol levels of the subjects were positively correlated with body fat. The blood triglycerides levels of the subjects were positively correlated with body weight, body fat, waist/hip ratio and BMI. Therefore, proper nutritional education and intervention are required for an improvement of obese children＇s dietary behavior, heath-related factors and blood lipid profiles.

• 한국조경학회지
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• 제34권5호
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• pp.76-83
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• 2006

The purpose of this study was to investigate the performance of porous grass block. For the investigation, Festuca arundinacea and Zoysia japonica 'Zenith' were planted, and the volume of evapotranspiration and remains were examined based on different materials in the water tank in the experiment of Festuca arundinacea, the volume of water storage of treatment with perlite ($10.84{\iota}/m^2$) was higher than that with drainage ($7l/m^2$). The difference between the two was $3.84/m^2$. The drainage treatment without water storage capacity showed the higher degree of dryness in turf grass. The volume of evapo-transpiration of treatment with perlite was the highest (21.57mm/week). The volume of evapotranspiration of treatment with sand was 19.57mm/week, and with treatment with drainage was 18.24mm/week. Based on the measured volume of daily evapotranspiration of $2.60{\sim}3.08mm\;d^{-1}$, it was determined that the unit with water storage capacity would store water of one to two days usage compared to unite without such storage capacity. In the experiment of Zoysia japonica 'Zenith', the volume of water storage of treatment with perlite was $10.77l/m^2$ which was similar to the former experiment. The volume of evapotranspiration of treatment with perlite and sand were 21.64mm/week and 20.64mm/week, respectively. In case of airtight water tank, the volume was measured as 22.06mm/week. Each treatment has no notable difference in the volume of evapotranspiration. In conclusion, from the investigation in this study, porous grass block with water tank was found to be effective in plant growth under low irrigation. As the ecological area ratio and vegetated porous pavement have became more emphasized, additional study of rain infiltration and reservoir effect are needed in the future.

• 한국주조공학회지
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• 제3권3호
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• pp.167-173
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• 1983

The effect of sand grain size on the various properties of mold is not only basic but important interest which we have to deal with.And the relation among the various properties of mold (strength, permeability, flowability, compactability, hardness, deformation, toughness etc.) is very complicated and inaccurate, so we can delineate the behavior of mixture (sand+water+bentonite) with experience only. Within recent years a so-called rigid-water theory has been accepted as a means of advancing logical explanations for the research aimed at delineating sand-clay-water relationships. By changing grain size or mesh no. of grain, specimens have been subjected to green compressive strength, permeability, deformation, flowability, compactablity, toughness at room temperature. Under constant mulling energy and ratio of water/bentonite, the results obtained were as follows: 1. With decreasing grain size green compressive strength of the specimen increased. 2. With decreasing grain size permeability decreased. 3. With decreasing grain size flowability and bulk density decreased but compactability increased. 4. With decreasing grain size deformation decreased but toughness increased. 5. At 60 mesh no., the properties of specimen are conspicuously changed. The reason is that the total surface area of sand grain which affects the type of bonding between sand grains is more changed at 60 mesh number.

• 농촌계획
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• 제20권4호
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• pp.35-43
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• 2014

The purpose of this study is to analyze emergy flows of rice for evaluating the value of rice production and sustainability. Emergy analysis evaluates the sustainability of systems or processes considering all the inputs to make a product or a sevice. In this study, we analyzed the emergy flows and indices of rice productionand compared the regional emergy values using statisticcal analysis: input materials, hours per unit area(10a), and production costs. As the results, we found that the rates of external investment (EIR= 18.87) and environmental loading (ELR=21.7) are significantly high during the rice cultivation. However, emergy yield ratio(EYR) shows that rice is a valuable resource because EYR is 5.12 and environmental Sustainability IndexSI value is as low as 0.24 and it shows rice has low sustainability. This study also shows that Chungcheongnam-do has the highest SI value for rice production due to low environmental loading and abundant natural energy during rice cultivation. These results of rice emergy flows and sustainability assessments could provide a way of sustainable rice cultivation with decrease of environmental loading from fertilizer.

• 대한금속재료학회지
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• 제48권6호
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• pp.514-522
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• 2010

Graphite epoxy composite material (GECM) shows high specific strength and its application in the aerospace industry is gradually increasing. However, its application would induce galvanic corrosion between GECM and metallic materials. This work focused on the effects of anodizing and thermal oxidation on galvanic corrosion in a 3.5% NaCl solution between GECM and aluminium and titanium. In the case of anodized aluminium, galvanic corrosion resistance to the GECM was greatly improved by the anodizing treatment regardless of area ratio. In the case of anodized titanium, the anodizing by a formation voltage of 50V increased corrosion resistance of titanium in galvanic tests. Thermal oxidation of titanium also improved corrosion resistance of Ti to GECM.

• Advances in concrete construction
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• 제14권5호
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• pp.341-354
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• 2022

Treatment of solid waste building materials is a crucial method of disposal and an area of ongoing research. New standards for the treatment of solid waste building materials are necessary due to multisource features, huge quantities, and complicated compositions of solid waste. In this research, sustainable nanomaterial mixtures containing nano-paper waste (NPW) and nano-metakaolin (NMK) were used as a substitute for Portland cement. Portland cement was replaced with different ratios of NPW and NMK (0%, 4%, 8%, and 12% by weight of cement) while the cement-to-water ratio remained constant at 0.4 in all mortar mixtures. The fresh properties had a positive effect on them, and with the increase in the percentage of replacement, the fresh properties decreased. The results of compressive strength at 7 and 28 days and flexural strength at 28 days show that the nanomaterials improved the strength, but the results of NMK were better than those of NPW. The best replacement rate was 8%, followed by 4%, and finally 12% for both materials. The combination of NMK and NPW as a replacement (12% NMK + 12% NPW) showed less shrinkage than the others because of the high pozzolanic reactivity of the nanomaterials. The combination of NMK and NPW improved the microstructure by increasing the hydration volume and lowering the water in the cement matrix, as clearly observed in the C-S-H decomposition.

• 한국환경복원기술학회지
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• 제15권5호
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• pp.19-29
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• 2012

The purpose of this study is to suggest improvements of Eco-Natural map preparation guideline by presenting assessment methods that can be applied to the result of river ecosystem health survey and assessment, using the Geographic Information System. The area for studying is the main stream of the Hwang River where is easy to collect data and available to compare before and after of river assessment. It was reevaluated by reflecting the result of river ecosystem health assessment of the Ministry of Environment. As the result, Eco-Natural map of the study area reflecting the river assessment, the changes in the area ratio by grade have been increased from 1.14% to 14.03% in the first-grade and from 24.64% to 43.91% in the second-grade. It is considered to present more realistic grade due to the assessment of the rivers that have not been reflected in the meantime. Consequently, the result of this study will be useful for establishing the development projects on the rivers, providing the foundation for more realistic and active protection.