• 아시안잔디학회지
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• 제21권2호
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• pp.177-182
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• 2007

축구장의 식재지반이 모래로 조성될 경우 낮은 보비력과 높은 용탈율로 인해 시비관리의 조정이 필요하다. 본 실험의 목적은 PVC관을 이용한 경기장 유사모형 실험구에서 캔터키 블루그래스에 있어서 완효성비료의 생육 효과를 비교 실험하였다. 잔디의 색깔, 균일도, 생육, 지상부 생체량과배출수의 질산의 유출량을 몇 가지 다른 생육상과 네 번의 유사 강우 시험 시 행하였다. 실험 결과 요소의 성분 유출량이 가장 높았고 공시 완효성비료는 가장 낮았다. 이 완효성 비료는 다른 공시 잔디비료에 비해 14일간, 요소보다는 28일간 잔디의 품질 면에서 비효가 지속되었다. 또한 이 완효성비료는 잔디의 웃자람과 잔디깎기에 소요되는 시간을 줄일 수 있었다. 질산태 질소의 유출에 있어서도 잔디의 조성 초반기에 50% 정도를 감소 시켰다.

• 한국압력기기공학회 논문집
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• 제11권2호
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• pp.45-50
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• 2015

In many cases, the field fracture mechanism of the thermoplastic pipe is considered as either brittle or environmental fractures. Thus the estimation of the lifetime by modeling slow crack growth considering such fracture mechanisms is required. In comparison of the some conventional and empirical equations to explain the slow crack growth rate such as the Paris' law, the crack layer theory can be used to simulate the crack and process zone growth behaviors precisely, so the lifetime of thermoplastic pipe can also be accurately estimated. In this study, the modified crack layer theory for the stress corrosion cracking (SCC) of high density polyethylene is introduced with detailed algorithm. The oxidation induction time of the HDPE is also considered for the reduction of specific fracture energy during exposed to chemical environments. Furthermore, the parametric study for an important SCC parameter is conducted to understand the slow crack growth behavior of SCC.

• 한국세라믹학회지
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• 제33권2호
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• pp.203-213
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• 1996

In this study the subcritical crack growth behavior in an Al2O3-SiCw composite has been investigated using in situ fracture technique of applied moment double cantilever beam (AMDCB) specimens indside an SEM. This technique allows the detailed observation of whisker and grain bridging in the crack wake region. The experimental results indicated that the KI-a curve was deviated from the conventional powder law form and that the existed a region where the rate of microcrack growth was decreased with increasing the externally applied stress intensity factor. This behavior could be explained by arising crack growth resistance i.e. R-curve behavior which was associated with crack shielding due to whisker and grain bridging. The R-curve was also analyzed from the KI-a curve data in order to quantify the bridging effect in the Al2O3-SiCw composite.

• 한국버섯학회지
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• 제2권3호
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• pp.163-167
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• 2004

꽃송이는 약산성인 pH 5에서 생장이 가장 빠르다. 꽃송이는 MEF배지에서 가장 잘 자란다. 다음은 MES, MEI, YMF, YMM, YMT, YMB, YMI, MEA, PDA순으로 잘 자랐다. 꽃송이버섯은 종합미네랄을 0.2% 첨가하였을때 균사생장이 가장 좋았고, 0.2%보다 많거나 적을 경우 균사생장이 약해진다. 꽃송이버섯의 생육에는 무기염류(minerals)로서 P, K, N, S등이 비교적 다량(약 100~500mg/)으로 요구되며 그외에도 미량원소로서 Fe, Zn, Cu, Mo, Co, Mn, Cl등이 필요하다. 꽃송이버섯은 비오틴을 0.1% 첨가시 균사생장이 가장 좋았고 이보다 많거나 적을 경우 균사생장이 약해진다. 꽃송이버섯은 티아민을 0.1% 첨가시 균사생장이 가장 좋았고 이보다 많거나 적을 경우 균사생장이 약해진다. 꽃송이버섯은 Fructose을 2% 첨가시 균사생장이 가장 좋았고 이보다 많거나 적을 경우 균사생장이 약해진다.

• 한국의류학회지
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• 제38권1호
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• pp.59-72
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• 2014

This study investigated slow fashion consumers from a human desire viewpoint in order to examine the psychological aspects of slow fashion consumption. First, the concept of slow fashion was defined. Second, this study reviewed the concepts of desire found in Oriental philosophies and applied them to slow fashion consumption. This process identified the fundamental desire that motivates consumers of slow fashion. Lastly, the psychological aspects slow fashion consumers were examined through a comparison of fundamental desire and external reasons given by interviewees in regards to personal motivation to purchase slow fashion products. Data were collected through in-depth interviews with 10 unmarried women 25 to 37 years old with experience in buying slow fashion products. Exploratory data were classified into external reasons and fundamental reasons to derive the concept of slow fashion. First, slow fashion is defined as sustainable fashion that considers humans and nature. It also seeks to produce morally good products that transcend time and space. Second, we identified the following external reasons: social responsibility, pursuit of healthy products, and pursuit of beauty. Finally, we extracted four factors that reflected fundamental desire: Recognition Desire, Ostentation Desire, Sexual Appeal Desire, and Power Desire. Altruism was emphasized by respondents who expressed social responsibility among external reasons and the desire for recognition among fundamental reasons. However, this goodwill also originated from human desire due to the emotional healing they receive from helping others. Interviewees sought psychological benefits such as self-satisfaction and spiritual growth through slow fashion that implied an Association of slow fashion consumption with human desire. Slow fashion consumption was influenced by moral convictions as well as various desires; in addition, external reasons for slow fashion consumption could be explained by desire.

• 한국미생물·생명공학회지
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• 제13권1호
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• pp.13-17
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• 1985

국내에서 분리된 대두근류균을 생육속도에 따라서 2.4시간의 평균세대시간을 가지는 fast-grower와 13.1시간의 평균세대시간을 가지는 slow-grower로 나눌 수 있었다. Fest-grower는 6-phosogluconate dehydrogenase 효소역가가 slow-grower 보다 높았으며 sucrose를 탄소원으로 이용하였다. Fest-grower 중에서 특히 R4, R278은 NaCl 0.5M농 도에서도 생육하였으며 시험한 대두 근류균은 모두 pH 4.5 이하에서 생육이 저지되었다. 또한 식물배양기 조건하에서 접종실험을 한 결과 시험된 모든 대두품종에 양호하게 근류를 형성하였으며 L-259 (NRRL) 균주에 비해서 0.1-2배의 질소고정력을 나타내었다.

• 한국토양비료학회지
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• 제41권4호
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• pp.254-259
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• 2008

The aim of this study was to investigate the effects of slow-release nitrogen fertilizer (SRNF) on the growth of radish plants. Wastepaper was deinked by alkaline solution and SRNF was produced from fertilizer impregnated wastepaper, which applied to an experimental plot compared with a urea fertilized plot. The plant height and total chlorophyll content of the radishes were higher while they were treated with SRNF than with urea. Some agronomic and chemical components were also observed and significant differences between the two fertilizers were found. When the soil was treated with SRNF, the pH, organic matter and total nitrogen content were higher than in the soil which was treated with urea.

• 한국작물학회:학술대회논문집
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• 한국작물학회 1988년도 정기총회 및 학술연구발표회
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• pp.46-47
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• 1988

• KDI Journal of Economic Policy
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• 제39권2호
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• pp.25-51
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• 2017

This paper employs an Overlapping Generations Model to quantify the impacts of Korea's demographic transition toward an older population on the total output growth rate. The model incorporates the projected population through 2060 according by Statistics Korea. The effects of the low fertility and increased life expectancy rates are studied. The model is considered suitable for analyzing the effects of demographic changes on the Korean economy. Under the assumption that the TFP growth rate will not slow considerably in the future, remaining at 1.3% per annum, the gross output growth rate of the Korean economy is projected to slow to 1.1% per annum in the 2050s, from 4.0% in the 2000s. The shrinking workforce due to the decline in fertility plays a significant role in the deceleration of the Korean economy. The increased life expectancy rate is expected to mitigate the negative effect, but the magnitude of its effect is found to be limited.

• 복식문화연구
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• 제15권1호
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• pp.37-57
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• 2007

The purpose of this study was to analyze the body measurements of boys and girls at puberty and to provide the fundamental data for pubescent apparel manufacturers to produce clothing that reflect their physical characteristics. A total of 549 boys and 529 girls aged between 10 and 14 were measured in the capital area from March 4 to April 3, 2004. Data were collected from 35 anthropometric items and 12 photographic items per a person. SPSS Ver. 12 program was used in data analysis including means, standard deviation, t-test and Duncan test. The main results of this study were as follows. They showed the significant difference of their growth in accordance with the increase of their ages. There were also the difference between boys and girls. As for height and length items, boys showed a slow growth at the age of $10{\sim}11\;and\;12{\sim}13$. Those at the age of $11{\sim}12\;and\;13{\sim}14$ showed rapid growth. That is, an active growth was followed by a slow growth and that phenomenon repeatedly occurred. On the other hand, girls showed remarkable growth at the age $10{\sim}11$ and the growth rate gradually slowed down afterward. Regarding circumference items, boys at the age of $11{\sim}12\;and\;13{\sim}14$ showed remarkable growth. This results showed that boys at the age of $11{\sim}12$ had vertical growth and horizontal growth at the same time and for those at the age of $13{\sim}14$, growth was more conspicuous in horizontal direction. Meanwhile, for girls, the growth rate was high at the age of $11{\sim}12$, somewhat later than the age of the growth of height and length. As for breadth-related items and depth-related items, for both sexes two items grew steadily throughout the ages, breadth-related items showed a higher growth rate than that of depth-related items. This study analyzed the body measurements of pubescent boys and girls and the results showed that, for boys, an active physical growth took place at the age of 13 according to previous studies, but the findings of this study suggested that the phenomenon now occurred at the age of $11{\sim}12$, which proved that physical growth took place earlier than before. Also, an active growth was followed by a slow growth. Girls at puberty showed remarkable growth of height at the age of $10{\sim}11$ that is consistent with previous studies and then showed horizontal growth at the age of around 12, having a voluminous body shape.