• 원예과학기술지
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• 제35권1호
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• pp.131-141
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• 2017

본 연구는 면마과 가는쇠고사리[A. aristata (G. Forst.) Tindale]의 각 생육단계에 적합한 기내 대량증식법을 구명하기 위해 수행되었다. 포자를 1 / 8 - 1배로 조절한 MS 배지와 Knop 배지에 파종한 결과, Knop 배지에서 최종 발아율이 87.1%로 가장 높았다. 또한 전엽체를 배지의 종류, sucrose와 활성탄의 농도, 질소급원의 농도 및 비율을 다르게 처리하여 8주간 배양하였다. 실험의 결과, 가는쇠고사리의 전엽체는 sucrose 3%의 MS배지에서 $NH_4Cl$과 $KNO_3$의 비율을 20 : 40mM로 하여 총 농도를 60mM로 조절한 배지에서 증식이 가장 왕성하였다. 토양 종류에 따른 포자체 형성을 관찰한 결과, 상토:펄라이트를 2 : 1(v/ v)로 혼용하였을 때, 단위면적 당 발생한 포자체의 수가 73.8개 / $7.5{\times}7.5cm$로 가장 많았다. 반면 피트모스를 단용 및 혼용처리한 조건에서는 전엽체 발달 및 포자체 형성이 억제되었다. 따라서 가는쇠고사리는 MS 배지에서 전엽체를 증식시킨 다음 상토 : 펄라이트(v / v = 2 : 1) 혼합토양에서 포자체 형성을 유도하는 것이 효과적인 증식법으로 생각된다.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2011년도 춘계학술대회 초록집
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• pp.117.1-117.1
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• 2011

We have demonstrated Forst-type resonance energy transfer (FRET) in the quasi-solid type dye-sensitized solar cells between organic fluorescence materials as an energy donor doped in polymeric gel electrolyte and ruthenium complex as an energy acceptor on surface of $TiO_2$. The strong spectral overlap of emission/absorption of energy donor and acceptor is required to get high FRET efficiency. The judicious choice of energy donor allows the enhancement of light harvesting characters of energy acceptor in quasi-solid dye sensitized solar cells which increase the power conversion efficiency. The enhanced light harvesting effect by the judicious choice/design of the fluorescence materials and sensitizing dyes permits the enhancement of photovoltaic performance of DSSC.

• 한국펄프종이공학회:학술대회논문집
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• 한국펄프종이공학회 1999년도 추계학술발표논문집
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• pp.125-138
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• 1999

• Journal of the Korean Wood Science and Technology
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• 제12권2호
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• pp.44-49
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• 1984

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1995년도 추계학술대회 논문집
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• pp.24-27
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• 1995

This paper presents, step-by-step, the capabilities that a general-purpose simulation environment, such as Simulab/Matlab,provides for an intuitive and sfficient modelling of grinding processes. Starting from a revision of the different approaches which can go found in the technical literature the paper begins with the well-known block-diagram forst presented by Snoyes and how the different parameters for the simulation are introduced in the model(machine,grinding wheel and process parameters). Special attention is paid to the fact that nonlinear phenomena can easily be include.

• The Korean Journal of Ecology
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• 제14권3호
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• pp.273-303
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• 1991

A phytosociological study of forest vegetation was carried out in mt. komdan in the period from October 7,1985 to October 15 1989. The forst vegetation could be classified into 7 communities ; quercus monbolica,pinus densiflora, quercus dentata, pinus koraiensis, larix leptoletsis, pinus rigida,castanea creaneta. The principal forest community in mt. komdan-the quercus mongulica community- was distributed mainly at the altitude of 400~600m and the importance value was 187.1. The pinus desiflora community was 137.9. since pinus koraiensis, larix laptolepsis,pinus rigida, castanea creanata, etc. werw planted in this region, It seems that it was frequently disturbed by human interference,especilly, the destruction of the vegetation in the recreation ground of paldang, the regions around the village of hasangok-ri and the main routes for mountain climbing appeared severely.

• The Korean Journal of Ecology
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• 제14권2호
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• pp.181-194
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• 1991

Vascular plants, the structure and interrelationship of the forst vegetation in pyonsan peninsula national park were inverstigated by phytosociological, continuum analysis and ordination methods. The flora was composed of 119 families,411 genera, 609 species, 79 varieties, 10 forma or 698 taxa. Some characteristics of the plants have been represented such as ch-$D_1$-$R_5$ type in biological one, erect form in growth on. It is noticeable that lycoris aurea, carpinus tschonoskii var. eximia, corylus hallaisanensis and abeliophyllum distichun among the investigated plants delong to endemic and/or rare species. The forest vegetation was classified into seven communities: quercus variabilis, pinus densiflora, quercus serrat, platycarya, carpinus tschonoskii, quercus dentata, zelkova serrata community. and quercus variabilis, pinus densiflora and pinus rigida, were the commonest species among distributed species. In addition interrelationship between diversity and dominant indrx of quercus variabilis community was little different each other and that of accordance altitude also was not much distinguishable. Platycarya strobilacea, pinus densiflora and quercus variabilas community were distinguished different groups by polar ordination.

• Journal of Advanced Marine Engineering and Technology
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• 제33권5호
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• pp.721-728
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• 2009

PID control is widely used to control stable processes, however, PID control for unstable processes is less common. In this paper, systematic tuning methods are derived to tune the PID controller for unstable FOPTD(Forst Order Plus Time Delay) processes. The proposed PID controllers for set-point tracking and disturbance rejection problem are tuned based on minimizing the performance indexes (IAE, ISE, ITAE) using a real-coded genetic algorithm. Simulation example is given to illustrate the set-point tracking and disturbance rejection performance of the proposed method.

• 설비공학논문집
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• 제7권2호
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• pp.319-328
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• 1995

In this study, the experiment with 2rows-2columns fin-tube heat exchanger under forced convection and frosting condition is performed. The influence of each operating condition(the temperature of air, the humidity of air, the velocity of air, the temperature of coolant) on the growth of frost layer, air-side pressure drop, and characteristics of heat transfer is investigated. The experimental results show that the frost thickness increases rapidly in the early stage of frost formation and increases linearly after sometime. The frost thickness increases with the increase of the inlet air humidity and velocity and the decrease of inlet air temperature and coolant temperature. It is also found that the total energy transfer rate increases with the increase of inlet air temperature and velocity and with the decrease of inlet air humidity and coolant temperature.

• 한국환경과학회지
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• 제22권7호
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• pp.801-810
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• 2013

To improve the physical and chemical properties of the soil and increasing water-retaining property of the soil, Superabsorbent synthetic polymeric materials have been used. The experiment carried out from April to July 2012 after the influence evaluation of Superabsorbent synthetic polymeric materials to vines plant. The result shows that the study of Hedera japonica Tobler, the growth and the survival rates rank as media > hydroponic > superabsorbent synthetic polymers, and the growth and the survival rates are considerably pessimistic in the experiment of hydroponic and superabsorbent synthetic polymers. In the study of Trachelospermum asiaticum var. intermedium, the growth and the survival rates rank as hydroponic > media > superabsorbent synthetic polymers, the difference between the experiment of hydroponic and is very small and the survival rates are not very good in the experiment of superabsorbent synthetic polymers. In the study of Euonymus fortunei var. radicans Rehder,it is insignificantly difference among the different of planting based. Judging from these results, the differences are depending on the species of plants. The thesis holds that the characteristics of plant should be considered in plant cultivation and soil improvement in the future, and it is desirable to use the appropriate mixing ratio of soil in soil improvement as well.