• Proceedings of the Acoustical Society of Korea Conference
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• 1998.06e
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• pp.165-168
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• 1998

본 논문에서는 충격성 잡음에 강인하기 위한 시변 주파수 추정 기법을 제안하였다 충격성 잡음에 강인하기 위해서는 충격성 잡음에 의한 추정 변수의 동요를 제한하고 추정된 오차가 향후 추정시 영향을 미치는 오차의 전파현상을 제한하여야 한다. 충격성 잡음에 의한 추정오차의 전파를 제한하기 위해서는 망각인자의 도입이 필요함을 증명하였고 보다 효과적으로 사용하기 위해서 가변 망각인자를 도입하였다. 가변 망각인자의 도입으로 충격성 잡음에 의한 오차의 전파를 선택적으로 제한할 수 있으며 충격성 잡음에 의한 추정계수의 변동은 영향함수 측면에서 Huber함수를 이용하여 제한하였다. 제안된 알고리듬은 Huber함수와 가변망각인자의 도입으로 충격성 잡음에 의해 생기는 오차의 크기와 오차의 영향이 전파되는 것을 적응적으로 제한하기 때문에 모의실험을 통해 기존의 칼만 알고리듬보다 나은 성능을 보임을 알 수 있었다.

• Korean Journal of Microbiology
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• v.40 no.1
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• pp.7-11
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• 2004

eIF5B is a translation initiation factor that delivers Met-$tRNA^{Met}$ to AUG start codon and subsequently joins the small and large ribosomes. In order to study the function of eIF5B encoded by FUN12, we constructed FUN12 which lacked 5' end of its sequence. We found that this construct lacking almost all of its promoter in pRS plasmid partially complemented slow growth phenotype of fun12 deletion strain. Interestingly, this construct expressed N-terminally truncated eIF5B and its expression level was about 5% of that of wild type eIF5B. Low amount of the eIF5B expressed additionally in fun12 deletion strain played a direct role as a limiting factor for its growth. This limiting factor eIF5B in those strains also modulates activities of overall translation in vitro.

• Journal of Nutrition and Health
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• v.9 no.4
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• pp.54-58
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• 1976

Deterioration of ascorbic acid content is the important factor in the food quality. The degradation of ascorbic acid undergoes as a first-order of reaction in the presence of excess oxygen content. However, under the limited oxygen content, ascorbic acid decomposes as a psudo-first order of reaction. The ascorbic acid, in this study, under the limited dissolved oxygen content in the presesce of iron(III) and copper(II) decomposed as first-order reaction with a little influence in rate constant and the light was an accelerating factor on the ascorbic acid degradation.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.28 no.4
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• pp.475-488
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• 1995

In order to see the seasonal variation of nutrients and the limiting factors to the primary production in Deukryang Bay, both dissolved inorganic nutrients and salinity were measured in the surface waters during the periods from July 1992 to March 1993. The mean value of salinity was the lowest in ?all and the highest in early spring. Dissolved inorganic nitrogen (DIN) was the highest in winter and the lowest in summer. However, both phosphate and silicate were the highest in summer and the lowest in fall. Salinity was generally higher in the outer region than in the inner region of the bay.DIN content was nearly depleted (less than $2{\mu}M$) in summer. From fall to spring, DIN content was nearly depleted in the inner region and relatively high in the outer region of the Day. Phosphate was the highest in summer showing an opposite distribution pattern to salinity, and it was nearly depleted (less than $0.1{\mu}M$) in fall and winter. In spring, however, phosphate content was slightly high in the outer region. Silicate content showed an opposite distribution pattern to salinity in summer. in other seasons, However, the distribution pattern of silicate was similar to the salinity. DIN seemed to be a limiting factor for the primary production at all area of the bay in summer and at the inner region in other season. However, phosphate seemed to be a limiting factor at all area of the bay in fall and winter and at the inner region in spring. Silicate may limit the production of diatoms at the inner region of the bay in winter and spying. Both phosphate and silicate showed a good inverse relationship with salinity in summer, which indicates inputs of these nutrients from the freshwater runoff. In the other seasons, both nitrate and silicate showed a positive linear relationship with salinity in the outer region of the bay, suggesting that these two nutrients were mainly supplied by the inflow of the offshore costal water which had high nitrate content associated with vertical mixing.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2007.05a
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• pp.105-109
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• 2007

• Korean Journal of Ecology and Environment
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• v.35 no.1 s.97
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• pp.1-9
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• 2002

In order to understand the relationship between succession of phytoplankton community structure and inorganic nutrients and particulate organic matters, a one station in Kyungan stream in Korea during the dry season was chosen. Water samplings were carried out once a week from 18 August to 13 November 1993. The DIN concentration distributed always abundantly, however, phosphate and silicate gradually reduced during the period. Phytoplankton community had a peak chlorophyll a concentration of $90.6\;{\mu}g/l$ in late summer (21 August 1993) and a second peak of $29.7\;{\mu}g/l$ in autumn (2 October 1993). After then late autumn was characterined by relatively low chlorophyll a concentration of $15{\sim}16\;{\mu}g/l$. Seasonal fluctuation of chlorophyll a concentrations were correlated with measured POC and PON concentrations: phytoplankton blooming may be a major factor controlling POC and PON concentrations in this ecosystem. Phosphate plays an most important role as a limiting factor of phytoplankton growth. However, when Si/P ratio low, silicate may be a more critical limiting factor than phosphate. Shifts of P-limitation to Si- limitation the succession of dominant phytoplankton can in duce: diatom to cyanobacteria such as Anabaena, Microcystis and Oscillatoria.

• Nuclear Engineering and Technology
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• v.17 no.4
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• pp.267-278
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• 1985

Some kinds of methods have been applied to regulate the exposure doses by the radioactive effluents from nuclear power plants. The essential one is primary dose equivalent limit recommended by the ICRP. When the primary limit cannot be applied directly for regulation, there have been dose equivalent index in case of external exposure, or maximum permissible concentration, annual limit on intake, derived air concentration and maximum permissible body burden in case of internal exposure. But the derived limit is required from the viewpoint of discharge, for those values are inadequate to control discharge rate directly. This study was carried out to derive the release limit for the Wolsung nuclear power plant by the concentration factor method. This method is based on the assumption of steady state transfer between environment compartments.

• The Science & Technology
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• v.6 no.8 s.51
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• pp.25-28
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• 1973

좁은 면적에서나마 좀더 많은 수확을 얻으려는 노력은 부단히 계속되고 있다. 그러나 인구는 나날이 불어가고 경작면적은 제한되어 있기 때문에 그 문제점은 더욱 커지고 있는 것이다. 소위 재배에 적합하다는 고래로부터의 농경지에서만이 식량생산이 가능한 것일까? 하지만 이는 옛말이 되고 말았다. 모래밭에서 노다지를 캐낼 수 있기 때문이다. 고대 농대의 김용길 교수는 녹색식물의 영양, 생장, 광합성에 관한 능력발휘의 어느한계 이상에서는 토양이 오히려 제한적 인자로 등장한다고 지적하면서 이와같은 단점을 배제한 관권농법과 모래땅의 식물재배법을 연구 발표하였다. 토양의 제한성을 제거하고 근권매지에 새로운 영양환경을 조성하여 작물생산능력을 극대화하자는 것이 김교수의 주장이다.

• Proceedings of the Korean Nuclear Society Conference
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• 2002.10a
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• pp.70.2-70
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• 2002

• Proceedings of the Korea Multimedia Society Conference
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• 2003.11a
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• pp.112-115
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• 2003

모듈러 멱승은 주어진 값 X, E, N에 대하여 X$^{E}$ mod N으로 정의된다. 모듈러 멱승은 대부분의 공개키 암호시스템과 전자서명에 사용되므로, 이 연산을 빠르게 수행하는 문제는 암호학 분야에서 중요하게 연구 되고 있다. 모듈러 멱승을 계산하기 위해 가장 많이 사용되는 효율적인 알고리즘은 VLNW방법이다. 그러나 이 방법은d, q 인자를 고정시키기 때문에 제한적인 결과를 제공한다. 일반화된 그래프 모델은 VLNW방법의 f 인자를 제거하여 그 성능을 향상시켰다. 그러나 고 인자는 여전히 VLNW방법과 동일하게 고정되어 있다. d 인자는 초기 블록 테이블을 결정하는 인자로써, 이것을 확장할 경우 천 처리 시간이 기하급수적으로 증가하게 된다. 그러나, 본 논문은 전 처리 시간의 기하급수적인 증가를 저지하면서도 고 인자를 확장하기 위해서 초기 블록 테이블을 만드는 몇 가지 효율적인 방법을 제시한다. 이 방법은 VLNW 방법과 일반화된 그래프 모델보다도 효율적이며, 그 성능은 실험을 통하여 검증하였다.