http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Development and Utilization of Propolis
Y.K. Park(박영근),M. Ikegaki,M.H. Koo 한국양봉학회 1998 한국양봉학회 학술대회 자료집 Vol.- No.-
Three hundred samples of propolis were collected from various locations in Southern and Southeastern Brazil and analyscd by UV-spectrophotometer, RP-HPTLC and RP-HPLC. The samples were classified in accordance with patterns of UV-absorption spectra and RP-HPTLC and it was found that all samples were consisted of 7 kinds of propolis. Among these samples, one sample was performed further investigation, using water and ethanolic extracts of propolis. Extraction of propolis was performed by using the water and various concentrations of ethanol as solvent. The extract was investigated hy measurement of absorption spectrum with a UV-spectrophotometer, reversed phase-high performance thin-layer chromatography, reversed phase-HPLC. Maximum absorption spectrum of all extracts was 290 ㎚, resembling flavonoid compounds, and the 80% ethanolic extract showed highest absorption at 290 ㎚. The most isosakuranetin, quercetin and kaempferol were extracted from mixtures of propolis and 60% ethanol, whereas 70% ethanol extracted the most pinocembrin and sakuranetin, but 80% ethanol extracted more kaempferide, acacetin, and isorhamnetin from propolis. The 60 to 80% ethanolic extracts of propolis inhibited highly microbial growth and 70 and 80% ethanolic extracts showed the greatest antioxidant activity and 80% ethanolic extract inhibited highly 10 hyaluronidase activity. Propolis is bee glue, collected by bees from various plant sources. Bees mix the original propolis with beeswax and β-glucosidase which they secrete during the propoli. collection. This hydrolyzes the flavonoid glycosides into flavonoid aglycones. The propolis is used by bees as a glue to seal the opening of the hives and to eliminate outside invaders (1,2,3). The word propolis was derived from the Greek Pro- for defense and polis-for city, that is, defense of the city or thc hive. So far, mainly polyphenolic compounds have been identified in the propolis collected by Apis mellifera, The main polyphcnols are flavonoids, accompanied by phenolic acids and their esters, phenolic aldehydes, alcohols, and ketones (4). Recently, four Di-O-caffeoyl quinic acid derivative were isolated from propolis and found that these compounds were potent hepatoprotective agents (5). It was also reported that extracts of propolis contained some compounds (not identified) which showed potent cytotoxity, having ED50, values equal to or less than 10 ㎍/mL, using human HT-1080 fibrosarcoma and murine colon 26-L5 carcinoma cells. (6). It was known that the ethanolic extracts of propolis exhibit various pharmacological activities such as antibacterial, antiviral, antifungal, anaesthetic, anti-inflammatory, hypotensive. immunostimulatory, and cytostatic properties (7,8). Therefore, the medical applications of propolis preparations have led to an increased interest in its chemical composition as well as to its origin. Recently, the propolis preparations have heen used for the produclions of health foods and cosmetics. Tbese propolis preparations are ethanolic extracts of propolis and rarely water extracts. On the other hand, we have noted thai quality and quantity of flavonoids aglycones of propolis were different Southeastern and Southern Braril. Consequently, we concluded that this is due to different plant ecologies (9,10). Later. we also found that the qualitative difference of flavonoids in propolis was not only upon plant ecology but the variety of the bees also related the difference of propolis compositions (11). The objective of this presentation was to introduce relationship between some chemical compositions of propolis and variety of these bees and plant ecology. This presentation was also engaged in an adequate method for preparation of ethanolic extracts of propolis. The ethanolic extracts compared with water extract of propolis were evaluated their antimicrohial, antioxidant, anti-inflammatory, and antitumoral activities.
권청철(S.C. Kwin),한승호(S.H. Han),이학주(H.J. Lee),박영근(Y.K. Park),고기중(K.J. Ko) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(2)
한전에서는 수요관리의 하나의 방법으로 심야전략요금제도를 운영하고, 심야축열기기를 보급하여 기저부하증대 및 부하율을 개선하기 위한 많은 노력을 기울이고 있다 최근 유가상승 등의 원인으로 1999 년과 2000 년에 심야전력 난방기기의 급격한 보급증가로 인한 심야시간대 동계 최대 전력수요가 발생하여 22시 이후 단시간 부하급증으로 일부지역의 배전선로 회선용량부족 및 부하불평형으로 정전을 유발하게 되는 등 많은 어려움이 발생하였다 본 논문은 심야수요급증으로 인한 대책의 일환으로 축열식 심야난방기기에 대하여 심야전력의 공급시간 자동제어장치를 개발하였다 축열 잔열량을 측정하여 그 잉여량만큼의 시간동안 심야전력의 공급을 지연하여 심야전력 공급초기에 집중되는 심야 기기의 가동을 억제하여 심야부하를 분산하게 된 다 이로써 축열식 난방기기애 의한 동계 최대 선력수요 발생을 억제하여, 배전선로의 효율적인 운 영에 기여할 것으로 기대된다.<br/>
全錫徹,成圭寶,朴永根,朴忠基,徐興錫,咸蒼谷 한양대학교 의과대학 1984 한양의대 학술지 Vol.4 No.1
Radiologic manifestations were analysed in chest injured patients who were admitted and treated at the Department of Thoracic and Cardiovascular Surgery during the period of 5 years from Aug. 1978 to Aug. 1983. The patients were 253 in number and the results were as follows; 1. Nonpenetrating trauma is more frequent (83.8%) than penetrating trauma. 2. The most frequent oause of trauma is traffic accident(60.1%). 3. The frequent radiologic findings in nonpenetrating chest injury were rib fracture, hemothorax and subcutanneous emphysema, and in poetrating chest injury, subcutaneous emphysema, hemothorax and pneumothorx in order of frequency. 4. The most frequently fractured rib was 6th rib, and frequently fractured ribs were from 3rd to 8th ribs(more than 40% of patients). 5. In all cases of hemopneumothorax were associated with rib fracture in nonpenetrating injury. 6. Delayed apperaance of hemothorax, pneumothorax and hemopeumothorax was seen in 9.0% of cases(14 cases).
尹永愛,朴永根,高秉熙,李承魯,趙溫九 한양대학교 의과대학 1984 한양의대 학술지 Vol.4 No.2
Melanoma is a tumor of melanin forming cells, originated from ectoderm and shows frequent metastasis to skin, lung, liver and gastrointestinal tract, and sometimes show only metastatic lesion to lymph node without knowing of primary site. Authors report a case of malignant melanoma, metastasis to brain and gastrointestinal tract, with a brief review of the literatures.
스테인레스강 용접부의 피로균열 전파속도 예측에 관한 연구
이용복,정진성,박영근,김호경 한국공작기계학회 1998 한국생산제조학회지 Vol.7 No.3
Welding structure contains residual stress due to thermal-plastic strain during welding process, and its magnitude and distribution depend on welding conditions. Cracks initiate from various of the weldment, propagate and lead to final fracture. The crack initiation and propagation processes are affected by the magnitude and distribution. Therefore, the magnitude and distribution of weldment residual stress should be considered for safety design and service of welding structures. Also it is very important that more accurate assessment method of fatigue crack growth must take into account the redistributing the residual stress quantitatively, because the residual stress in weldment has characteristics of its redistribution with loading magnitude, number of cycles and fatigue crack propagation. In this study, fatigue crack behavior of STS-304 weldment was investigated during crack propagation into tensile residual stress region or compressive residual stress region. Crack growth rates were predicted and compared with experimental results.