• 한국항행학회논문지
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• 제27권3호
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• pp.281-286
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• 2023

본 논문은 고정위성업무(FSS; Fixed-Satellite Service) 및 방송위성업무(BSS; Broadcasting-Satellite Service)의 다운링크 대역을 통합하는 Ku 대역의 위성통신용 광대역 혼합 패치 배열 안테나의 설계에 관한 것으로써, 제안한 안테나는 FR4 기판 상에 사각 패치를 6 x 2 형태로 배열하여 구현되었다. FSS 다운링크 대역(10.7~10.95 GHz, 11.2~11.45 GHz) 및 BSS 다운링크 대역(11.7~12.5 GHz, 12.2~12.75 GHz, 11.7~12.2 GHz)을 모두 포함하는 광대역(10.7~12.75 GHz) 안테나를 설계하기 위해 11.5 GHz 및 12.5 GHz에서 동작하는 사각 패치를 각각 교대로 배열하였고 이를 통해 중심주파수의 30.8%에 해당하는 광대역을 확보하였다. 안테나의 성능을 확인하기 위해 제안한 안테나를 제작 및 측정하였고 모의시험 결과와 유사함을 확인하였으며 따라서 제안된 안테나는 FSS 및 BSS 다운링크를 위한 안테나로 적용이 가능하다.

• Archives of Pharmacal Research
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• 제8권4호
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• pp.229-236
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• 1985

Oxidation of presenegenin dimethyl ester triacetate with chromium trioxide in acetic acid yielded two compounds, 11-ketone (IV) and 12-ketone (IV) derivatives. The latter was a main product. On mild alkaline hydrolysis, IV afforded 11-keto-presenegenin dimethyl ester (V), mp 232-$234^{\circ}$, $C_{32}H_{48}O_{8}$, whereas VI did 12-keto-presenegenin dimethyl ester 12, 27-hemiketal (VIII), mp 240-$242^{\circ}$, $C_{32}H_{50}O_{8}$.

• 한국임상수의학회지
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• 제12권1호
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• pp.861-876
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• 1995

This study was carried out to get fundamental information about the normal ultrasonogram of the liver and heart in Korean native cattle and calves. The interventricular septum, left ventricular internal diameter, left ventricular free wall thickness, aortic diameter, left atrial diameter, and right ventricular internal diameter of hear in 10 Korean native calves were determined at 4-5 right intercostal spare by use of ultrasonography. The caudal vena cava, portal vein, gallbladder, liver of 9 Korean native cattle and 10 calves were determined at 12, 11 and 10th intercostal spares by use of ultrasonography. Cursor-directed M-mode and gray-scale, B-mode ultrasonograms were obtained with electronic scanning ultrasound equipment with a 3.5 or 5.0-MHz convex transducer. The results obtained through the experiments were summarized as follows: 1. The result of ultrasonographic examination of the korean native calves' heart 1) Interventricular septum in systole and diastole was 1.23 and 0.81 cm, respectively(vc=28.84, 17.4). 2) Ventricular internal diameter in systole and diastole was 2.50 and 4.91 cm, respectively(vc=17.44, 12.73). 3) Left ventricular free was thickness in systole and diastole was 1.44 and 0.92 cm, respectively(vc=26.85, 23.54). 4) Aortic diameter was 2.69.m, .rspectevely(vc=11.29). 5) Left atrial diameter was 1.82 cm(vc=15.31). 6) Right ventricular internal diameter in systole and diastole was 1.12 and 1.9 cm, respectively(vc=33.71, 24.43). 3. Ultrasonographic measurments of caudal vena cava, portal vein, gallbladder of Korean native calves 1) Dorsal margin of caudal vena cava at the 12, 11 and 10th intercostal space was 13.5, 15.3 and 18.1 cm, respectively(p<0.01). 3) Depth of caudal vena cava at the 12, 11 and 10th intercostal space was 4.4, 4.5 and 4.6 cm, respectively. 3) Diameter of caudal vena cava at the 12, 11 and 10th intercostal space was 11.6, 1.7 and 1.6 cm, respectively. 4) Dorsal margin of portal vein at the 12, 11 and 10th intercostal space was 16.2, 18.6 and 21.4 cm, respectively(p<0.01) 5) Depth of portal vein at the 12, 11 and 10th intercostal spare was 4.5, 4.4 and 3.9 cm respectively. 6) Diameter of portal vein at the 13, 11 and 10th intercostal space was 2.1, 2.2 and 1.9 cm respectively. 7) Dorsal margin of gallbladder at the 11 and 10th intercostal space was 23.6 and 23.9 cm, respectively(p<0.01), 8) Longitudinal diameter of gallbladder at the 11 and 10th intercostal space was 7.1 and 5.9 cm, respectively(p<0.05). 9) Transverse diameter of gallbladder at the 11 and 10th intercostal space was 2.4 and 2.1 cm respectively(p<0.01). 3. Ultrasonographic measurments of caudal vena cava, portal vein, gallbladder of Korean native cattle 1) Dorsal margin of caudal vena cava at the 12 and 11th intercostal space was 22.2, and 25.4 cm, respectively(p<0.01). 2) Depth of caudal vena cava at the 12 and 11th intercostal space was 103 and 11.1 cm, respectively(p<0.01). 3) Diameter of caudal vena cava at the 12 and 11th intercostal space was 3.1 and 3.0 cm, respectively. 4) Dorsal margin of portal vein at the 12 and 11th intercostal space was 29.3 and 32.9 cm, respectively(p<0.01). 5) Depth of portal vein at the 12 and 11th intercostal space was 9.6, and 9.2 cm, respectively. 6) Diameter of portal vein at the 12 and lith intercostal space was 3.4 and 3.3 cm, respectively. 7) Dorsal margin of gallbladder at the 11 and 10th intercostal space was 43.1 and 45.5 cm, respectively(p<0.01). 8) Longitudinal diameter of gallbladder at the 11 and 10th intercostal space was 10.1 and 9.4 cm, respectively. 9) Transverse diameter of gallbladder at the 11 and 10th intercostal space was 4.0 and 3.7 cm, respectively. 4, Ultrasonogaphic measurments of dorsal margin, ventral margin, size and angles of the Korean native calves' liver. 1) Dorsal margin of liver at the 12, 11 and 10th intercostal space was 11.0, 9.6, and 12.4 cm, respectively(p<0.01). 2) Ventral margin of liver at the 12, 11 and 10th intercostal spate was 20, 24 and 26.1 cm, respectively(p<0.01). 3) Size of the liver at the 12, 11 and 10th intercostal space was 9.0, 14.6 and 13.8 cm, respectively(p<0.01). 4) Angle of liver at the 12, 11 and 10th intercostal space was 40, 46 and 37, respectively(p<0.01). 5. Ultrasonographic measurmants of dorsal margin, ventral margin, size and anglses of the korean native cattle's liver 1) Dorsal margin of the liver at the 12, 11 and 10th intercostal space was 14.4, 18.2 and 26, 3 cm, respectively. 2) Ventral margin of liver at the 12, 11 and 10th intercostal space was 41.1, 46.4 and 49.3 cm, respectively(p<0.01). 3) Size of the liver at the 12, 11 and 10th intercostal space was 26.8, 28.2 and 23.2 cm, respectively(p<0.01). 4) Angel of liverat the 15, 11 and 10 intercostal space was 41, 40.6 and 35.7, respectively(p<0.05). It was concluded that the ultrasonographic values oletermined in this study can be used as references for the diagnosis of morphologic changes in the hear and liver in korean native calves, and in the liver in korean native rattle.

• 대한화학회지
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• 제38권3호
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• pp.254-259
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• 1994

Methyl기를 포함하는 새로운 5종의 crown ether를 합성하였다. 2,3,4,5: 9,10,11,12-Dibenzo-8,8-dimethyl-15,18,1-trioxacycloeicosane, 2,3,4,5: 9,10,11,12-dibenzo-8,8-dimethyl-15,18,21,1-tetraoxacyclotricosane, 2,3,4,5 : 9,10,11,12-dibenzo-8,8-dimethyl-15,18,21,24,1-pentaoxacyclohexacosane, 2,3,4,5 : 9,10,11,12 : 22,23,24,25 : 29,30,31,32-tetrabenzo-8,8,28,28-tetramethyl-15,18,21,35,38,1-hexaoxacyclotetracontane 그리고 2,3,4,5 : 9,10,11,12 : 25,26,27,28:32,33,34,35-tetrabenzo-8,8,31,31-tetramethyl-15,18,21,24,38,41,44,1-octaoxacyclohexatetracontane은 (M = Na, K)존재하에서 4,4'-isopropylidenediphenol과 di-, tri- 그리고 tetraethyleneglycol ditosylate의 반응에 의해 합성하였다. Diethyleneglycol ditosylate, triethyleneglycol ditosylate, tetraethyleneglycol ditosylate는 NaOH존재하에서 diethyleneglycol, triethyleneglycol 그리고 tetraethyleneglycol과 p-toluenesulfonylchloride의 반응에 의해 합성하였다.

• 한국대기환경학회지
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• 제10권1호
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• pp.41-48
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• 1994

A monitoring system for atmospheric CFC-12 and CFC-11 has been established at Mt. Kwan-Ak, Seoul National University (SNU) since July, 1991. The concentrations showed quite a large variation ranging from 495 to 37600 pptv (pptv=part per trillion, 10$^{-12}$ , v/v) for CFC-12 and from 233 to 12100 pptv for CFC-11 due to many local sources. However, monthly medians show rather limited ranges ; 553~765 pptv for CFC-12 and 301~431 pptv for CFC-11. Furthermore minimum concentrations could be defined relatively well during the whole period of observation. The regional background concentrations in 1993 near SNU wer estimated as 533 pptv for CFC-12 and 293 pptv for CFC-11. These values are very comparable to global averages in Northern Hemisphere, 523 pptv for CFC-12 and 287 pptv for CFC-11, reflecting the fast atmospheric mixing processes within the hemisphere. Examinations with meteorological parameters such as wind speed and direction suggest the possible measurement-window at SNU, appropriate for regional monitoring. Studies for improving the monitoring capability of the SNU station such as automation of the analysis system along with correlation with other meteorological parameters, are in progress at the present time.

• Preventive Nutrition and Food Science
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• 제11권3호
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• pp.253-256
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• 2006

The purpose of this study was to develop a gas chromatographic (GC) method to analyze fatty acids in milk fat with a single injection. The single-injection GC method we developed for analyzing fatty acid composition can separate a wide range of fatty acid methyl esters from butyric acid to docosahexaenoic acid. It separated 6 isomers of 18:1 (cis-6, cis-9, cis-11, trans-6, trans-9 and trans-11), 4 isomers of 18:2 (cis-9-cis-12, trans-9-trans-12, cis-9-trans-12 and trans-9-cis-12), and 4 isomers of conjugated 18:2 (cis-9- trans-11, trans-9-cis-11, cis-10-trans-12 and trans-10-cis-12).

• 대한화학회지
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• 제40권7호
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• pp.519-525
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• 1996

3-Carbomethoxy-1(3H)-isobenzofuraneme(9)과 .alpha., .beta.-불포화 에스테르 화합물 3a-b를 각각 반응시켜서 naphthacene-6, 7-dione 11a-b를 좋은 수율로 얻었다. 이들 중 C-9 위치에 에틸기가 없는 11a는 산화시켰을 때 naphthacene-5, 12-dione 13a가 생성되는 반면, 에틸기를 갖고 있는 11b는 naphthacene-5, 7, 12-trione 12b와 naphthacene-5, 12-dione 13b가 3:2로 생성되어졌다.

• Journal of Animal Science and Technology
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• 제49권1호
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• pp.25-32
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• 2007

본 연구는 여러 CLA 이성체, 즉 cis-9, cis- 11(c9c11), cis-9, trans-11(c9t11), trans-9, trans-11 (t9t11) 및 trans-10, cis-12(t10c12)가 배양 중인 돼지 지방세포와 근육세포의 분화와 증식에 미치는 영향을 구명하고자 실시하였다. 세포는 신생자돈으로부터 분리했다. t10c12 이성체는 지방세포의 분화를 억제했는데(92%) 근육세포의 분화는 억제시키지 않았다. t9t11 이성체는 지방세포의 분화를 억제했는데(14%), 근육세포의 분화는 촉진시켰다(26%). 다른 CLA 이성체는 지방세포나 근육세포의 분화에 영향을 미치지 않았다. 그리고 CLA가 지방세포와 근육세포의 증식에 미치는 영향은 분화에 미치는 영향에 비해서 작았다. 위의 결과는 여러 CLA 이성체는 돼지 지방세포와 근육세포의 분화에 다른 영향을 미침을 나타낸다.

• 한국재료학회지
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• 제8권11호
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• pp.1026-1030
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• 1998

Fe기 비정질합금에서 과냉각액체영역의 유무에 따른 열적 안정성을 비교평가하기 위하여 결정화온도 이하에서 유리천이가 나타나지 않는 $Fe_{80}P_6C_{12}B_{12}$합금과 52K의 과냉각 액체영역을 갖는 $Fe_{73}P_{11}C_6B_4AI_4Ge_2$ glassy 합금을 열분석하였다. 등온결정화에 의한 열분석의 결과 JMA plot의 n값은 $Fe_{80}P_6C_{12}B_{12}$합금이 1.8-2.2이고 과냉각 액체영역을 갖는 $Fe_{73}P_{11}C_6B_4AI_4Ge_2$ 합금이 2.5-4.0으로서 후자의 경우가 열적으로 안정하였다. 결정화의 양상은 $Fe_{80}P_6C_{12}B_{12}$ 합금의 경우 핵생성속도가 일정할 때 확산율속에 의해 결정입자가 성장하는 반면 $Fe_{73}P_{11}C_6B_4AI_4Ge_2$ glassy합금의 경우 핵생성속도가 일정할 때 계면입자가 성장한다. $Fe_{73}P_{11}C_6B_4AI_4Ge_2$ 합금 및 $Fe_{80}P_6C_{12}B_{12}$ 합금의 결정화에 필요한 활성화에너지, 핵생성 및 성장에 필요한 활성화에너지는 각각 371, 353kJ/mol, 그리고 324, 301KJ/mol 및 301, 273KJ/mol로서 과냉각 액체영역을 갖는 합금이 열적으로 안정하다고 판단된다.

• Applied Biological Chemistry
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• 제35권2호
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• pp.106-109
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• 1992

국화과의 일증인 개똥쑥(Artemisia annua L., 청호(靑蒿))에는 항말라리아 물질인 artemisinin이 함유되어 있다. 11,12-Dihydroarteanuic acid는 cell-free 방법으로 수행한 실험에서, Agrobacterium tumefaciens로 형질 전환된 crown gall의 homogenate와의 incubation에서 artemisinin으로 전환되었다. 그러나 arteannuic acid는 NADPH와 함께 incubation하였을 때 dihydro acid로 전환되지 않았다. 따라서 이 결과는 식물체의 조건에 따라서, dihydro acid가 자발적으로 뿐만 아니라, 생체내에서 효소 반응에 의해서도 artemisinin으로 전환될 수 있음을 나타낸다.