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 ( 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.

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.

돼지 난자 체외성숙중 난자 - 난구세포 복합체의 단백질 합성

변태호(T . H . Byun),이중한(J . H . Lee),박성수(S . S . Park),이상호(S . H . Lee) 한국축산학회 1991 한국축산학회지 Vol.33 No.7

Newly synthesized polypeptides were analysed in porcine oocytes undergoing maturation in vitro. Oocytes were cultured in M16+FCS supplemented with 10 IU PMS and 10 IU hCG at 39℃ in an atmosphere of 5% CO₂ in air far 35 h. At 5 h intervals oocytes were exposed to 200 μCl of [^35S]-methionine in M16+ FCS with the hormones for 2 h from the beginning of the culture. Polypeptides synthesized both in the oocytes and cumulus cells were analysed by SDS-PAGE and fluorography at the various intervals of oocytec maturation in vitro. In the culture system employed the oocytes showed about 50% of GVBD at 20 h of culture. At the end of the culture approximately of the oocytes showed met-aphase II chromosomes and the Ist polar body. the oocytes and cumulus cells showed synthesis of cell-specific as well as house-keeping proteins. Several stage-specific proteins were also identified both in the oocytes and cumulus cells during the maturation process. In particular, the synthesis of stage-specific proteins was most prominent in cumulus cells undergoing the cumulus expansion, which is being used as a major criterion of oocyte maturation in vitro in this species. The results indicate that cumulus Cells as well as the oocyte should synthesize necessary poly peptides at specific stages of development associated with nuclear maturation of oocyte and cumulus expansion during the maturation in vitro.

Multi-wall 탄소나노튜브의 수소 저장 특성

황준연(J . Y . Hwang),이상호(S . H . Lee),심규성(K . S . Sim),김종원(J . W . Kim) 한국수소및신에너지학회 2001 한국수소 및 신에너지학회논문집 Vol.12 No.1

Carbon nanotubes were prepared by catalytic decomposition of CH₄ using Ni-MgO catalyst at various temperatures. H₂ effect on crystallinity and morphology during the synthesis of carbon nanotubes was investigated. The crystallinity and morphology were characterized by SEM, TEM, XRD, TGA, and Raman spectroscopy. In addition, the hydrogen adsorption properties were evaluated by PCT measurement in a hydrogen pressure range between 1 and 121 bar. The optimal synthesis temperature of carbon nanotubes was elevated in the presence of H₂, although significant difference of carbon nanotube morphology was not found. It is believed that hydrogen served as self-cleaner mops the amorphous carbon on the catalyst surface. It is proved that the carbon nanotubes have multi-walled structure, short length with a outer diameter of 20-40? and open tips after elimination of the catalyst. The amount of hydrogen adsorbed in carbon nanotubes is increased as the pressure of hydrogen is increased and reaches 1.3 wt% under the hydrogen pressure of 120 bar at room temperature.

45 Mb/s 광섬유통신 시스템의 현장시험

이성은(S. U. Lee),이상호(S. H. Lee),유강희(K. H. Yoo),박희갑(H. G. Park),주흥로(H. R. Choo),이만섭(M. S. Lee),이용탁(Y. T. Lee),강민호(M. H. Kang) 대한전자공학회 1982 대한전자공학회 학술대회 Vol.1982 No.9

냉간압연 공정에서 롤 탄성 변형을 고려한 두께 24 ㎛ 동극박 생산

이상호(S. H. Lee),김병민(B. M. Kim) 한국정밀공학회 2007 한국정밀공학회 학술발표대회 논문집 Vol.2007 No.11월

냉간 압연 공정에 의한 두께 36㎛ 동극박 제조 공정 해석

이상호(S. H. Lee),김병민(B. M. Kim) 한국소성가공학회 2007 한국소성가공학회 학술대회 논문집 Vol.2007 No.5

allyl Trenbolone 에 의한 미경산돈의 발정 동기화 유기

이상호(S . H . Lee),홍기창(K . C . Hong),전진태(J . T . Jeon) 한국축산학회 1992 한국축산학회지 Vol.34 No.5

Estrous synchronization was induced using a synthetic progesterone derivative, allyl trenbolone (Regumate porcine), in sexually mature gilts. Gilts were divided into a control group and 2 treatment groups (6-7 gilt per group) fed 20 ㎎ allyl trenbolone in feed/gilt daily for 18 consecutive days (Regumate). Gilts in one of the treatment groups received 2,000 IU PMS and 1,500 IU hCG after the cessation of Regumate (Regumate + PMS + hCG). Estrus was effectively synchronized with apparently no adverse effect in 86% of the treated gilts within 7 days after treatment. The intervals from the cessation of treatment to estrus were 6.1 days with Regumate and 5.1 days with Regumate+PMS+hCG groups, respectively. The average number of ovulated follicles in the gilts of Regumate group was similar to that in control group, and could be increased variably by the additional injections of PMS and hCG. The results suggest that Regumate is effective in inducing estrus synchronization in sexually mature gilts. The additional use of PMS and hCG with Regumate may be useful for the relatively narrow synchronization of estrus and superovulation in gilts.

열간 압연에서 2 단 사이징 프레스 금형에 의한 슬래브의 변형거동 예측

이상호(S. H. Lee),김동환(D. H. Kim),변상민(S. M. Byon),박해두(H. D. Park),김병민(B. M. Kim) 한국소성·가공학회 2005 소성가공 : 한국소성가공학회지 Vol.14 No.9