• The Journal of Korean Institute of Communications and Information Sciences
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• v.23 no.7
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• pp.1869-1882
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• 1998

In this paper, we investigae convergence behaviors of a differential method for 2-D motion parameter estimation. While the differential method is widely studied for motion compensated prediction in video coding, little attention hs been paid to its convergence properties. Based on the nonseparable exponential covariance image model, we derive the estimates of update terms for the 2- and 6-parameter motion models. And, the effect of noise, spatial correlation, choice of spatial gradient measures, andthe size of a region, are quantitatively anlyzed in relation to the convergence speed. Some empirical results are presented to verify the analysis.

• Analytical Science and Technology
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• v.16 no.4
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• pp.283-291
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• 2003

Humic and fulvic acids present in soils of different depth were extracted and their acidic functional groups and structural characteristics were analyzed and compared. The purpose of this study was to present a basic data needed to evaluate the effect of humic substances on depth distribution and migrational behaviour of radioactive elements deposited on soil. Acidic functional groups of the humic and fulvic acids were analyzed by pH titration method, and their proton exchange capacity (PEC, $mq\;g^{-1}$) and average $pK_a$ values were obtained. Structural characteristics of the humic and fulvic acids were analyzed using their CPMAS $^{13}C$ NMR spectra and elemental composition data. pH titration data showed that fulvic acids have higher acidic functional group contents ranging from 5.5 to $7.0meq\;g^{-1}$ compared with that of humic acids ($3.8{\sim}4.8meq\;g^{-1}$). From depth profiles, it has been found that PEC values of humic acids in deeper soil (> 8 cm) were higher than those at the surface soils. Elemental compositions (H/C ratio) and spectral features ($C_{arom}/C_{aliph}$ ratio) obtained from CPMAS $^{13}C$ NMR spectra showed that the aromatic character in humic acids was a relatively higher than that of fulvic acids, while lower in carboxyl carbon content. The aromatic character and carboxyl carbon contents of humic acids tend to increase as soil depth increased, but those of fulvic acid showed little differences by the soil depth range.

• Journal of the Korean Chemical Society
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• v.47 no.4
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• pp.427-431
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• 2003

• Proceedings of the Korean Society of Applied Entomolohy Conference
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• 2001.11a
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• pp.101-101
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• 2001

• Journal of the Korean Chemical Society
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• v.43 no.1
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• pp.7-119
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• 1999

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2006.04a
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• pp.357-358
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• 2006

• Proceedings of the Korean Society of Environment and Ecology Conference
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• 2009.10a
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• pp.143-145
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• 2009

• Proceedings of the Membrane Society of Korea Conference
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• 1993.04a
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• pp.12-15
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• 1993

방사선 graft 중합법을 이용하여, microfiltration hollow fiber(MF)에 affinity ligand로서 소수성 아미노산 (tryptophan)을 고정하였다. affinity막에 압력차를 주어 막의 안쪽으로 부터 바깥쪽으로 단백질 용액을 투과시키면서, 단백질의 흡착 성능을 알아보았다. affinity막이 확산이동 저항이 없는 우수한 분리 기능 재료인 것을 나타내었다.

• Proceedings of the Korean Society of Dyers and Finishers Conference
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• 2007.11a
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• pp.29-30
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• 2007

• Monthly Korean Chicken
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• v.5 no.10 s.52
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• pp.2-7
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• 1999

`99한국 국제축산박람회(KISTOCK `99)개최 - 농림부, ‘도축장 HACCP실행 매뉴얼’ 배포- 닭고기 수출은 각종 규제 완화 ${\cdot}$ 개선돼야 - 농림부, 농산물 유통마진표시제 내년 도입 - 육계 점등 프로그램 - 중국산 가금육 수입위생조건 강화될 듯 - 세계 육계산업 주도권 동양으로 이동 - 미국, 육계생산 타축종보다 수지 높아 - 필리핀, 냉동닭고기 면세 수입 중단 발표 - 외식업체 키즈마케팅 본격화