• Mycobiology
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• 제47권1호
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• pp.97-104
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• 2019

Mushroom cultivation has gained increased attention in recent years. Currently, only four types of spawn, including sawdust spawn, grain spawn, liquid spawn, and stick spawn, are commonly available for mushroom cultivation. This limited spawn diversity has led to difficulty in selecting suitable inoculum materials in some cultivation. In this study, three small blocks of lignocellulosic agro-wastes and one block of a synthetic matrix were prepared as support for growing Pleurotus ostreatus in liquid medium. Mycelium-adsorbed blocks were then evaluated for their potential as block spawn for fructification. Our results indicated that the edible fungus was adsorbed and abundantly grew internally and externally on loofah sponge and synthetic polyurethane foam (PUF) supports and also has the ability to attach and grow on the surface of sugarcane bagasse and corncob supports. The mycelia of P. ostreatus adhered on corncob exhibited the highest metabolic activity, while those on the PUF showed the least activity. Mycelial extension rates of block spawns made of agro-waste materials were comparable to that of sawdust spawn, but the block spawn of PUF showed a significantly lower rate. No significant differences in cropping time and yield were observed among cultivations between experimental block spawns and sawdust spawns. Moreover, the corncob block spawn maintained its fruiting potential during an examined period of 6-month storage. The developed block spawn could be practically applied in mushroom cultivation.

• 원예과학기술지
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• 제31권4호
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• pp.517-521
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• 2013

'Dream Round'는 경기도농업기술원에서 2010년도에 육성한 절화용 스프레이 국화 신품종이다. 2006년도에 화색이 흰색이면서 갈색심을 가지는 아네모네형 스프레이용 국화 'Hebo' 품종을 모본으로 하고 분홍색의 아네모네형 스프레이용 국화 'Samos' 품종을 부본으로 하여 교배를 하였다. 2007년도에 실생을 양성한 후 선발된 실생계통 중에서 화색과 화형이 우수한 8계통의 예비선발을 수행하였으며, 2008-2010년에 주년 재배성을 위한 3회 이상의 특성검정과 품평회를 실시한 결과, 절화생육과 개화특성이 우수한 'GCS 06-'99-10' 계통을 최종 선발하여 'Dream Round'로 명명하였다. 'Dream Round'는 흰색의 설상화(RHS White Group 155B)에 진분홍색(RHS Red Purple Group 68A)의 통상화를 가지는 아네모네형으로 꽃잎수는 26.1매이고, 꽃직경은 34.1mm 이며, 절화장은 92.4cm이고 흰녹병 발생은 거의 없었으며, 절화 수명은 21.7일 이었다.

• 농촌지도와개발
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• 제19권2호
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• pp.321-353
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• 2012

This study aims to find out ways of improving life satisfaction of rural elderly by investigating their work and leisure activity, two significant axis of the life in later life. For this purpose, researchers and one assistant researcher visited house, senior citizen's center and health center, in order to have interviews with senior citizen above 65, who are currently working in the field. The summary of the research findings are as follows; First, the average size of the farm land which each senior citizen works on is $9,237.92m^2$ and they mostly work for economic reason. During farming season, they work on average 8.62 hour per day. As primary reasons for why farming work is difficult, "insufficient income" was picked. In fact, the average annual income senior citizens earn from farming is about 15.4 million won. 49.1% of sample senior citizens work both on watered farm and farm, and they are engaged in farming 48.82 years on average, showing that most of their lives have been spent on farming. In spite of these difficulties, most senior citizens showed high intention to continue farming work further. Second, senior citizens turn out to spend their leisure time mostly on public leisure activities such as watching TV, hearing radio and gatherings with families, relatives. However, individual activities such as meditation, yoga, drawing and calligraphy turn out to be low because they require foundations to enjoy. Third, senior citizen in rural areas were divided into four groups by farm work and leisure activity: group separated from work and leisure activity(27.09%), group centered to leisure activity(24.42%), group centered to work(23.75%), and group integrated work and leisure activity(23.75%). Fourth, the groups were different depending on demographic characteristics. Namely, male senior citizen, higher educational level, living in elderly couple households, and satisfied with their economic level belonged to the group integrated work and leisure activity. But senior citizen aged above 65 years old and working for their livelihood belonged to the group centered to work, and most of female and senior citizen aged above 80 years old belonged to the group separated from work and leisure activity. Finally, as the result of analysis of differences in life satisfaction according to farm work and leisure activity of senior citizen in rural areas, the group integrated work and leisure activity, and group centered to leisure activity were higher in life satisfaction than the group separated from work and leisure activity, and group centered to work. The above result indicates that life satisfaction of senior citizen depends upon leisure activity rather than work.

• 한국약용작물학회지
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• 제22권3호
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• pp.231-236
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• 2014

This experiment was carried out to establish the optimum cutting time, plant growth regulator, and bed-soil for rooting by greenwood cutting of Schisandra chinensis. Approximately 7 cm long-shoots of greenwood cuttings were transplanted by various cutting times, plant growth regulators, and bed-soils in the plastic-film house. The rooting rate of greenwood cutting was 12.5% in the April 5th, 73.5% in the May 8th, and 75.5% in the August 5th. The number and length of primary root in greenwood cutting were more in the early May than those in the early August. For mass propagation of Schisandra chinensis. using greenwood cutting, shoots were treated with plant growth regulators on May to increase rooting rate. Rooting rate was 100% with IAA $50mg/{\ell}$, 92.9% with NAA $100mg/{\ell}$, and NAA $1,000mg/{\ell}$, for 60 min. To select effective media for rooting, various medias for bed-soil were treated by single and mixture form for 100 days after cutting. Rooting rate was 91.8% in the single treatment of peat moss or decomposition of granite soil, and this result was better than those in other treatment. The treatment by 1 : 1 mixture of peat moss and horticulture bed soil was rooting with 94.0% best rooting rate.

• 한국응용곤충학회지
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• 제56권2호
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• pp.195-201
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• 2017

곤충병원성 곰팡이 Zoophthora radicans (Entomophthorales: Entomophthoraceae)가 혹명나방, 배추좀나방, 복숭아혹진딧물과 진딧물인 미분류 1종을 감염시키는 것을 발견하였다. 이들은 전라북도 진안, 김제, 익산에서 수집되었고, 6월과 9월에 관찰이 가능하였다. 이 균에 감염된 혹명나방은 진안에서 수집되었고, 감염율이 46%에 달하였다. 감염된 곤충 충체로부터 균을 분리하여 Sabouraud dextrose agar with yeast extract (SDAY)를 이용하여 인공배양을 시도하였다. 그 결과, $20{\sim}28^{\circ}C$가 인공배양을 위한 최적온도로 판단되며, SDAY보다 SDAY supplemented with egg yolk and milk (SDAY-EM)에서 발육이 보다 양호하였다. 이 곰팡이는 자연적으로 발생함을 포장에서 확인할 수 있었다.

• Journal of Ginseng Research
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• 제43권1호
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• pp.1-9
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• 2019

Background: Korean ginseng is an important cash crop in Asian countries. However, plant yield is reduced by pathogens. Among the Ilyonectria radicicola-species complex, I. mors-panacis is responsible for root-rot and replant failure of ginseng in Asia. The development of new methods to reveal the existence of the pathogen before cultivation is started is essential. Therefore, a quantitative real-time polymerase chain reaction method was developed to detect and quantify the pathogen in ginseng soils. Methods: In this study, a species-specific histone H3 primer set was developed for the quantification of I. mors-panacis. The primer set was used on DNA from other microbes to evaluate its sensitivity and selectivity for I. mors-panacis DNA. Sterilized soil samples artificially infected with the pathogen at different concentrations were used to evaluate the ability of the primer set to detect the pathogen population in the soil DNA. Finally, the pathogen was quantified in many natural soil samples. Results: The designed primer set was found to be sensitive and selective for I. mors-panacis DNA. In artificially infected sterilized soil samples, using quantitative real-time polymerase chain reaction the estimated amount of template was positively correlated with the pathogen concentration in soil samples ($R^2=0.95$), disease severity index ($R^2=0.99$), and colony-forming units ($R^2=0.87$). In natural soils, the pathogen was recorded in most fields producing bad yields at a range of $5.82{\pm}2.35pg/g$ to $892.34{\pm}103.70pg/g$ of soil. Conclusion: According to these results, the proposed primer set is applicable for estimating soil quality before ginseng cultivation. This will contribute to disease management and crop protection in the future.

• International Journal of Concrete Structures and Materials
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• 제9권4호
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• pp.487-498
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• 2015

A proper initial curing is a very simple and inexpensive alternative to improve concrete cover quality and accordingly extend the service life of reinforced concrete structures exposed to aggressive species. A current study investigates the effect of wet curing duration on chloride penetration in plain and blended cement concretes which subjected to tidal exposure condition in south of Iran for 5 years. The results show that wet curing extension preserves concrete against high rate of chloride penetration at early ages and decreases the difference between initial and long-term diffusion coefficients due to improvement of concrete cover quality. But, as the length of exposure period to marine environment increased the effects of initial wet curing became less pronounced. Furthermore, a relationship is developed between wet curing time and diffusion coefficient at early ages and the effect of curing length on time-to-corrosion initiation of concrete is addressed.

• 한국안전학회지
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• 제15권1호
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• pp.28-35
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• 2000

As huge energy transfer systems like a nuclear power plant, steam power plant and petrochemical plant are operated for a long time, mechanical properties are changed by degradation. The life time of the systems can be affected by the mechanical properties. So determination of the integrity of the metallic structure is required either to en4sure that failure will not occur during the service life of the components or to evaluate the lifetime extension of the structure. An automated ball indentation(ABI) method was developed as a non-destructive technique for evaluating the integrity of such metallic components. In this paper, we would like to present the aging evaluation technique by the ABI method. The five classes of the thermally aged CF8M specimens were prepared using an artificially accelerated aging method. After holding 100, 300, 900, 1800 and 3600 hours at 43$0^{\circ}C$, the specimens were cooled down using water to room temperature respectively. The tensile test, hardness test, charpy impact test, ABI test were performed. The results of the fracture test were compared with those of ABI test and the new evaluation technique of the integrity of metallic structures was developed.

• 동아시아식생활학회지
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• 제17권3호
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• pp.371-378
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• 2007

Red ginseng has been considered a functional food, and many studies on red ginseng and the prevention of cancer, hypertension, arteriosclerosis and constipation have been conducted. In this study, white bread dough with 1, 2, 3, 4 or 5% red ginseng marc powder was measured by a farinograph, extensograph, amylograph, as well as for pH to evaluate the development time, stability, extensibility, resistance to extension, gelatinization temperature, and maximum viscosity temperature. The ash content of the wheat flour increased with an increasing content of red ginseng marc powder. The gelatinization maximum and the temperature for the gelatinization maximum of the flour-water suspension in the amylograph were not affected by the addition of red ginseng marc powder. The moisture absorption of the wheat flour in the farinograph increased as the content of red ginseng marc powder increased. Also, as the content of red ginseng marc powder increased, dough development time decreased. The extensibility of the dough in the extensograph showed a negative relationship with the amount of red ginseng marc powder added.

• 한국측량학회지
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• 제14권2호
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• pp.229-239
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• 1996

교통기관으로서의 역할을 충분히 수행하기 위해서 철도속도향상을 통한 운행시간 단축은 인간의 생활양식 고급화 및 시간가치의 증대로 인해 절실히 요구되는 사항으로 부각되고 있다. 특히 열차운행속도에 매우 큰 영향을 주는 선형 요소는 곡선구간으로서, 우리나라의 경우 곡선구간이 많은 비율을 차지하고 있어 이 구간에서의 속도향상은 전체구간의 운행시간을 단축시킬 수 있기 때문에 우리나라의 선형에 대한 특성을 고려하여 곡선부 전체구간에 걸쳐서는 선형을 지배하고 있는 요소의 개량 및 부분적 개량방법으로 사용되는 완화곡선 연장기법을 각 단계에 걸쳐 주행안정성 및 승차감의 지표로서 이용하고 있는 횡가속도 값을 적용하여 속도향상를 통한 운행시간 단축효과를 얻었다. 이 결과 우리나라 선형조건상 곡선부 전구간을 개량하는 것이 운행시간을 단축하기 위해서는 완화곡선의 연장 방법 보다 효과적임을 나타내고 있다.