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금강하구 연안역에서 HF radar로 측정한 유속의 정확도
이상호,문홍배,백혜연,김창수,손영태,권효근,최병주,Lee, S.H.,Moon, H.B.,Baek, H.Y.,Kim, C.S.,Son, Y.T.,Kwon, H.K.,Choi, B.J. 한국해양학회 2008 바다 Vol.13 No.1
To evaluate the accuracy of currents measured by HF radar in the coastal sea off Keum River estuary, we compared the facing radial vectors of two HF radars, and HF radar-derived currents with in-situ measurement currents. Principal component analysis was used to extract regression line and RMS deviation in the comparison. When two facing radar's radial vectors at the mid-point of baseline are compared, RMS deviation is 4.4 cm/s in winter and 5.4 cm/s in summer. When GDOP(Geometric Dilution of Precision) effect is corrected from the RMS deviations that is analyzed from the comparison between HF radar-derived and current-metermeasured currents, the error of velocity combined by HF radar-derived current is less than 5.1 cm/s in the stations having moderate GDOP values. These two results obtained from different method suggest that the lower limit of HF radar-derived current's accuracy is 5.4 cm/s in our study area. As mentioned in previous researches, RMS deviations become large in the stations located near the islands and increase as a function of mean distance from the radar site due to decrease of signal-to-noise level and the intersect angle of radial vectors. We found that an uncertain error bound of HF radar-derived current can be produced from the separation process of RMS deviations using GDOP value if GDOP value for each component is very close and RMS deviations obtained from current component comparison are also close. When the current measured in the stations having moderate GDOP values is separated into tidal and subtidal current, characteristics of tidal current ellipses analyzed from HF radar-derived current show a good agreement with those from current-meter-measured current, and time variation of subtidal current showed a response reflecting physical process driven by wind and density field. 금강하구 연안역에서 HF radar로 측정한 유속의 정확도를 평가하기 위해 HF radar의 마주보는 radial 유속들을 비교하고, HF radar로 측정한 유속을 현장측정 유속과 비교하였다. 비교 자료들에 대한 회귀선과 편차는 주성분 분석(Principal Component Analysis)으로 구하였다. HF radar site를 연결하는 선의 중간지점에서 마주보는 radial vector를 비교하였을 때 RMS 편차는 동계에 4.4 cm/s, 하계에 5.4 cm/s이었다. HF radar와 유속계로 측정한 유속성분을 비교하여 분석된 RMS 편차에서 GDOP(Geometric Dilution of Precision) 효과를 제거하였을 때 HF radar의 합성 속도 측정오차는 GDOP 값이 적절한 정점들에서 5.1 cm/s 이내였다. 서로 다른 두 방법에 의해 구해진 이 결과는 연구해역에서 HF radar로 측정된 유속의 정확도 하한이 5.4 cm/s임을 제시한다. 기존의 연구에서와 같이 RMS 편차는 섬 주변에 있는 관측점에서 크게 되고, 두 radar에서 평균거리가 멀어질수록 신호 대 잡음수준과 radial vector 교차각의 감소로 인해 증가하였다. GDOP 값을 이용한 오차분리 과정에서 속도성분별 GDOP 값이 유사하고 비교 유속의 성분별 RMS 편차도 비슷한 값을 보이는 경우 HF radar 유속의 오차가 불확실한 값으로 도출될 수도 있음이 밝혀졌다. GDOP가 정상적인 radar 관측 범위 내에 있는 정점에서 측정된 유속을 조류와 해류로 분리하였을 때 HF radar 유속에서 구해진 조류타원의 특성은 유속계로 측정된 타원특성과 잘 부합하였고, 해류의 시간적 변화는 바람과 밀도장의 외력에 의한 물리적 과정을 반영하는 반응을 보였다.
Benzo[a]pyrene으로 유발한 Mouse Forestomach Tumor 생성에 대한 Astaxanthin 함유 난황의 효과
이상호,박철우,박원석,이영춘,최의성,하영래,Lee, Sang-H.,Park, Cherl-W.,Park, Won-S.,Lee, Young-C.,Choi, Eui-S.,Ha, Yeong-L. 한국응용생명화학회 1997 Applied Biological Chemistry (Appl Biol Chem) Vol.44 No.4
Benzo[a]pyrene (BP)으로 유발한 mouse의 전위암 형성에 대한 astaxanthin 함유 난황 (astaxanthin-containing egg yolk : AEY)의 영향을 연구하였다. Female ICR mouse (6-7 주령, 5 mice/cage, 20 mice/treatment)에게 물과 사료를 자유로이 공급하면서 일주일간 적응시킨 후 다음과 같이 처리를 하였다. BP (2 mg/0.2 ml corn oil)를 각 mouse에 경구투여하기 4 일과 2 일 전에 50 mg AEY, 100 mg AEY, 150 mg AEY, 또는 150 mg control egg yolk (CEY)을 함유하는 phosphate-buffered saline (PBS) 0.2 ml를 경구투여하였다. Control mouse는 0.2 ml PBS와 BP 만 경구투여하였다. 이 과정을 4회 반복하였다. BP를 경구투여 한 일주일 후부터 몸무게와 사료섭취량을 매주 기록하였으며 24주 후에 생존한 모든 mouse에 대해 전위암 생성을 조사하였다. AEY를 처리한 mouse에서는 control mouse나 CEY 처리 mouse에 비해 mouse 당 암의 수가 1/3 정도로 감소되었다. 이와 같은 AEY의 항암효과는 AEY의 처리량에 비례하였다. AEY 처리에 따른 암발생율은 control이나 CEY 처리에 비해 감소되었으나 150 mg AEY 처리에서만 유의성이 있는 감소를 보였다. AEY 처리에 따른 몸무게나 사료 소비량의 감소현상은 볼 수 없었다. 따라서 이 결과는 AEY가 BP로 유발한 mouse의 전위암 발생을 억제함을 암시한다. Anticarcinogenic activity of astaxanthin-containing egg yolks (designate AEY) was investigated for benzo[a]pyrene (BP)-induced mouse forestomach tumorigenesis initiating regimen. Female ICR mouse (6-7 weeks of age) were housed in polycarbonated cages (5 mice/cage; 20 mice/treatment) in a humidity-and-temperature-controlled facility and permitted free access to water and food. One week later, four and 2 days prior to p.o. treatment with BP (2 mg/0.2 ml corn oil), mice were given 0.2 ml PBS containing 50 mg AEY, 100 mg AEY, 150 mg AEY, or 150 mg CEY. Control mice were only given 0.2 ml PBS. Three days later this sequence was repeated for a total of 4 times. Beginning with the first intubation and continuing thereafter, body weight and food intake were recorded once weekly. All surviving mice were sacrificed 24 weeks after the first dose of BP. Mice treated with AEY developed only about one third as many neoplasms/animal as mice in control or CEY-treated group (p<0.05). Reduction effect of tumor development by AEY was dependent upon doses applied. Tumor incidence was also reduced by AEY treatments, but significantly reduced only by 150 mg AEY treatment when compared to that by control or CEY. Food intake and body weight were not affected by AEY treatment. These results indicate that AEY inhibits tumorigenesis of mouse forestomach induced by BP.
Benzo(a)pyrene으로 유발한 Mouse Forestomach Tumor 생성에 대한 Astaxanthin 함유 난황의 효과
이상호,박철우,박원석,이영춘,최의성,하영래 ( Sang H . Lee,Cherl W . Park,Won S . Park,Young C . Lee,Eui S . Choi,Yeong L . Ha ) 한국응용생명화학회 1997 Applied Biological Chemistry (Appl Biol Chem) Vol.40 No.6
Anticarcinogenic activity of astaxanthin-containing egg yolks (designate AEY) was investigated for benzo[a]pyrene (BP)-induced mouse forestomach tumorigenesis initiating regimen. Female ICR mouse (6-7 weeks of age) were housed in polycarbonated cages (5 mice/cage; 20 mice/treatment) in a humidity-and-temperature-controlled facility and permitted free access to water and food. One week later, four and 2 days prior to p.o. treatment with BP (2 ㎎/0.2 ㎖ corn oil), mice were given 0.2 ㎖ PBS containing 50 ㎎ AEY, 100 ㎎ AEY, 150 ㎎ AEY, or 150 ㎎ CEY. Control mice were only given 0.2 ㎖ PBS. Three days later this sequence was repeated for a total of 4 times. Beginning with the first intubation and continuing thereafter, body weight and food intake were recorded once weekly. All surviving mice were sacrificed 24 weeks after the first dose of BP. Mice treated with AEY developed only about one third as many neoplasms/animal as mice in control or CEY-treated group (p$lt;0.05). Reduction effect of tumor development by AEY was dependent upon doses applied. Tumor incidence was also reduced by AEY treatments, but significantly reduced only by 150 ㎎ AEY treatment when compared to that by control or CEY. Food intake and body weight were not affected by AEY treatment. These results indicate that AEY inhibits tumorigenesis of mouse forestomach induced by BP.
슬라이딩 모드 이론에 근거한 ABS 제어 알고리즘 개발 및 성능분석
이상호(S.H.Lee),방무석(M.S.Bang),한창수(C.S.Han) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_2
In conventional vehicle, the wheel could be locked by its own characteristics in sudden braking. To solve this problem, an ABS(Anti-lock Brake System) could be considered. This paper presents a mathematical vehicle model with brake dynamics and two different controllers are adopted. The one is sliding mode controller, the other is Drakunov's controller via sliding modes. And the effects of these controllers are compared with Bosch ABS controller by computer simulation using MATLAB.
이상호(S . H . Lee),전우민(W . M . Jeon),김영교(Y . K . Kim),이상업(S . U . Lee),정순영(S . Y . Jeong) 한국축산학회 1991 한국축산학회지 Vol.33 No.5
Major milk proteins were analysed using sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) and two demensional (2-D) gel electrophoresis combined with isoelectic focusing(IEF). α_s- and β-caseins were recognized in acid-precipitable fractions of both Holstein (HOL) and Korean Native cattle (KNC) milk as indicated with commercial preparation of bovine caseins. κ-Casein was further identified with a positive staining of periodic acid Schiffs (PAS) reagents and disappearance of the protein after rennin treatment. Both commercial α_s-, β-and κ-casein, and our casein preparations gave albumin and β-lactoglobulin bands in the SDS-PAGE. Other unknown minor components were also found in both HOL and KNC. In 2-D analysis albumin was separated into two different spots, and β-lactoglobulin was also separated into two genetic variants, A and B. Casein complexes are highly complicated with their heterogeneity. KNC appeared to have more proteins thus sho-wing different peptide patterns. The results suggest that SDS-PAGE and 2-D gel electrophoresis would be useful to analyse the major milk proteins and are applicable to various analytical purposes.
사이징 프레스에서 폭 압하 공정중 결함 저감을 위한 엔빌의 형상설계
이상호(S. H. Lee),이성진(S. J. Lee),이종빈(J. B. Lee),김병민(B. M. Kim) 한국소성·가공학회 2009 소성가공 : 한국소성가공학회지 Vol.18 No.1
Generally, a vertical rolling process is used to achieve extensive width reduction in hot strip mill. However, it is impossible to avoid the defects such as dog-bone and edge-seam defect. The sizing press process has been developed in response to the defects mentioned above. Especially, this study is carried out to investigate the deformation of slab by twostep sizing press. The deformation behavior of slab in the sizing press process is more favorable than that in conventional vertical rolling edger. The FE-simulation is applied to predict the deformation behavior of the slab. In this paper, the several causes of the asymmetrical deformation are mentioned for the purpose of understanding of the anvil shape. Load, dog-bone and edge- seam defect are discussed in width sizing process considering the anvil shape. And to reduce the problems generated at rougher mill just after sizing press, these are studied in this paper. The deformation behavior of slabs and optimum anvil shape are obtained by rigid-plastic finite element analyses and neural network.