• Korean Journal of Soil Science and Fertilizer
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• v.20 no.2
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• pp.185-192
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• 1987

A green house experiment was conducted to find out the acetylene reducing and $N_2$-fixing activity from photosynthetic and aerobic heterotrophic nitrogen fixing microorganisms in submerged paddy soil under different agricultural locality, soil series, soil texture, soil type, and drainage condition in which samples taken from without nitrogen treatment plot of NPK trials on 16 sites of the farmer's field. The results obtained were summarized as follows: 1. The highest acetylene reducing activity was observed at 7 days after incubation in the light condition (photo synthetic microbes+heterotrophic bacteria) while it was observed at 35 days incubation in the dark condition (heterotrophic bacteria). 2. Among the soil series, photosynthetic nitrogen fixing activity was pronounced more in Jangae, Ogcheon and Hwadong series while lower was obtained in Buyong and Daejeong series. Aerobic heterotrophic nitrogen fixing activity was high in Buyong and Daejong series. 3. Estimated amount of $N_2$-fixation from acetylene reducing activity was equivalented to 3.0 mg in light condition and 4.9 mg/100g/105 days in dark condition. 4. Among the agricultural locality, photosynthetic nitrogen fixing activity was high in rather warm southern part while heterotrophic nitrogen fixing activity was predominated more in mountainous area and Chungcheong continental. 5. Photosynthetic nitrogen fixing activity was predominated in high productive soil while aerobic heterotrophic nitrogen fixing activity was pronounced more in crose coarse sandy soil. 6. The soils properties of high photosynthetic nitrogen fixing activity were constituted of poorly or imperfectly drained clay or clay loam soil while heterotrophic nitrogen fixing activity was pronounced more in well to moderately well drained sandy or sandy loam soil.

• The Journal of the Korea Contents Association
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• v.15 no.10
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• pp.214-224
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• 2015

The purpose of this study is to establish the social support system for social integration by analyzing the effect of multicultural experiences on multicultural perception and stereotype and the meditating effect of multicultural perception. The research result is summarized as follow : First, multicultural perception is differently influenced according to multicultural experiences. That is, multicultural experiences have found to have the positive effect on multicultural acceptance and the negative effect on rejection about other cultures or prejudice about other cultures. Second, the result which analyzed the effect of multicultural perception on stereotype has found that acceptance about other cultures doesn't have any effect on stereotype. However, it can be found that the prejudice and rejection about other cultures are verified to be the variables which have the positive effect on stereotype. Third, the result which analyzed the direct effect of multicultural experiences on stereotype and the indirect effect through multicultural perception has found that multicultural experiences don't have any direct effect on stereotype, but do have the indirect effect through multicultural perception. With the help of information technology.

• Journal of Ocean Engineering and Technology
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• v.30 no.4
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• pp.243-252
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• 2016

Conventionally, the static angle of attack and static elevator tests are carried out separately to estimate hydrodynamic stability derivatives of underwater vehicles. However, it is difficult to verify the interaction between the angle of attack and elevator angle in such cases. In this study, we perform a static elevator with angle of attack test where both the angle of attack and elevator angle are varied simultaneously. The experimental results show that the angle of attack has an influence on the elevator control force and that this tendency is dependent on the sense in which the angle of attack and elevator angle are varied. We predict level flight performance using hydrodynamic derivatives estimated through this experiment. The predictions considering the effect of angle of attack show good agreement with trials conducted in the open sea.

• Proceedings of the Korean Information Science Society Conference
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• 2004.04b
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• pp.52-54
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• 2004

모바일 환경에서 효과적인 데이터 전송 방법인 브로드 캐스트 기법에서 중요한 문제 중의 하나가 데이터에 대한 인덱스 생성이다. 데이터에 대한 인덱스가 제공되면 클라이언트는 튜닝 타임과 엑세스 타임을 줄일 수 있고, 그와 함께 배터리 소모도 줄일 수 있다 기존에 제시된 인덱스 생성 기법온 대부분 트리 구조를 기반으로 하고 있다. 트리 기반 인덱싱 기법은 튜닝 타임을 최소화하지만, 반면 멀티-어트리뷰트(multi-attribute)에 대한 엑세스나 다양한 종류의 멀티미디어 데이터들 혹은 클러스터링 된 데이터에 대한 인덱스 생성이 어렵다. 이러한 문제를 해결하기 위해 시그너쳐 기반의 인덱싱 기법이 제시되었다. 그러나 기존의 시그너쳐 기반 인덱싱 기법에서는 엑세스 타임이 전체 브로드 캐스트 타임으로 고정되는 문제가 있었다. 본 논문비서는 앞으로 브로드 캐스팅 될 데이터들에 대한 포괄적인 정보를 가지는 시그너쳐 집합을 인덱스로 제공해서 클라이언트의 엑세스 타임을 최소화시키는 시그너쳐 스킴을 제시한다.

• KSBB Journal
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• v.6 no.4
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• pp.403-406
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• 1991

Lactic acid production yield was examined for commercial use by immobilizing Rhizopus oryzae with radiation induced polymer. The supporting material was synthesized by the low temperature radiation polymerization method, in which the microorganism was entrapped physically by contacting together in culture broth shaking for 24 hours. Support polymers with 5∼10vol-% monomers were able to increase their catalytic activities, consuming 65g/1 of glucose, producing 56g/1 of lactic acid, thus yielding 88% of product in general. But in free culture, the microorganism consumed almost all carbon sources and produced lactic acid only 60% even after 96 hours. The yield of the experiment under discussion was significantly high compared with conventional immobilization procedure.

• Proceedings of the Korean Information Science Society Conference
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• 2001.10b
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• pp.208-210
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• 2001

본 논문은 3차원 롤러코스터 시뮬레이션 게임기를 제작함에 있어서 사용자가 단순히 고정된 트랙 및 배경을 대상으로 롤러코스터를 타는 것이 아니라 자신이 원하는 게임환경을 구축할 수 있도록 하는 상호대화적 실시간 저작도구의 개발 내용을 제시한다. 트랙의 모양이나 경로, 배경장면이 미리 구성되거나 고정되는 것이 아니므로, 실시간으로 사용자와의 상호작용을 통해 트랙 데이터를 생성하고 트랙에 잘 융합되는 배경을 생성하기 위한 트랙구성 방법 및 자동 배경생성 알고리즘을 중심으로 소개한다.

• Korean Journal of Soil Science and Fertilizer
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• v.16 no.3
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• pp.286-293
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• 1983

The glucose application remarkably increased the heterotrophic acetylene reducing activities during one month incubation. The amount of the increases varied between the soils. Application of rice straw brought about the significant increases during incubation time. Compost contained the largest amount of available-N among the C-sources, and thereby brought the smallest increase in all soils. The cumulative fixed nitrogen with application of rice straw at 30 days incubation in the three experimented soils were highest in Hwadong clay soil, i.e, $2.2mg^N/100g$, intermediate in Ratchaburi soil $0.85mg^N$, and least in Konosu soil $0.80mg^N/100g$. On the other hand, nitrogen fixing heterotrophic, bacteria, such as Clostridia, aerobes and anaerobes, were remarkably increased by application of rice straw while Azotobacter and Beijerinkia were not. The cumulative fixed nitrogen was more pronounced in the clay soil than in the coarse loamy soil. More pronounced nitrogen fixing activities in light condition(heterotrophic + photosynthetic) than that in dark(heterotrophic) condition have been observed both in the coarse loamy and clay soils. The nitrogen fixing ability of photosynthetic microbes in paddy soil is probably higher in coarse loamy soil than in clay soil.

• Korean Journal of Soil Science and Fertilizer
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• v.12 no.1
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• pp.47-48
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• 1979

To study on the state of nitrogen fixation of Lemma associated with blue green algae this experiment was carried out. The results were as follows: 1) The blue green algaes associated with Lemnaceae were mainly Calthrix sp. and Microcrate sp., but Anabaena sp. was found only in L. gibba. 2) It was believed that Lemnaceae associated with blue green algae have semi-symbiotic nitrogen fixation ability, especially clear in L. oligorhiza.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.2042-2043
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• 2007

고압회전기의 운전중 부분방전을 효과적으로 측정하고 진단하기위해 고정자 권선과 슬롯사이에 취부 되는 방향성 결합기형태의 부분방전센서가 일부 사용되고 있다. 기존 결합기형 센서는 마이크로스트립 등의 전송선로 타입으로, 센서 출력 단자의 효과적인 매칭을 목표로 설계되었으나, 센싱도체의 폭이 좁아 권선으로부터 효과적인 커플링이 힘들다. 본 논문에서는 고정자 권선 및 슬롯 구조의 전계분포 계산결과를 바탕으로 부분방전 신호 측정에 효과적인 형태의 센서를 설계하였다. 제작된 센서를 실제와 동일한 고정자 권선 및 슬롯 구조에서 타 센서와 비교하여 성능을 시험한 결과, 기존 마이크로스트립타입의 센서와 상용센서에 비해 좋은 감도를 가지는 것으로 나타났다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.29 no.1A
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• pp.9-17
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• 2004

Adapt ive and fixed step size PC (power control) schemes for accommodating voice, video, and data are evaluated according to the different PC command rates and their effects on integrated Voice/Video/Data are investigated. The required minimum power levels are derived as PC thresholds and the effects of PC errors on channel quality and radio 1 ink capacity are investigated. The services with high bit rates and low bit error rates can cause a significant effect on the radio link qualifies of the other types of traffic. The results show that the adapt ive step size PC scheme for voice/video/data services can achieve more capacity and cause less interference to the radio channels because less minimum PIL(Power Increment Level) is required for the specified radio link outage probability.