DEHPA 담체함유 액체막에 의한 우라늄(Ⅵ) 추출

김우식,현영진,염경호,탁희경 연세대학교 산업기술연구소 1985 논문집 Vol.17 No.1

The extraction of uranium(VI) through a W/O/W liquid membrane containing DEHPA was studied in the counter transport system. The optimum stable conditions of W/O emulsion were determined; the optimum concentrations of surfactant span 80 and paraffine oil were 2 Vol.% and 50 Vol.%, respectively. The extraction results showed that more than 95% of uranium(VI) was extracted during 10 minutes when the carrier concentration was 4 Vol.%, internal aqueous phase; 1N-H₂SO₄solution, external aqueous phase; pH 2 and mixing speed; 350 rpm.

단독 전이성 척추 종양의 일괄 전척추 절제술

김기택,한정수,석경수,이영호,이상훈 대한척추외과학회 2003 대한척추외과학회지 Vol.10 No.3

구동용 3상 3중 쵸퍼방식

정연택,한경희,이승환,김성남 明知大學校 産業技術硏究所 1987 産業技術硏究所論文集 Vol.6 No.2

This paper, in case of chopper controlling D.C. Motors, suggested three phase chopper system in order to reduce a source current and amature current ripple, and it's characteristic proves study on the theory and experiment. As a result of consideration, it was found that chopper system had reduced current ripple compare with two phase chopper system and impressed voltage of motor could be continuously controlled from 0 to the source voltage by adjusting chopper's time ratio α from 0 to 1.

국내 무연탄용 순환유동층 Boiler의 Clinker생성에 관한 연구

전문택,김진호,김경남 三陟大學校 産業科學技術硏究所 2002 産業科學技術硏究論文集 Vol.7 No.1

The analysis of anthracite coal as fired basis and clinkers located on combustor, seal pot and cyclone to find out the reason why the bed materials agglomerated and resulted in clinkers were studied. It was one of the most serious problem in early period operating the Tonghae CFBC(Circulating Fluidized Bed Combustor). The proximate analysis, heat value analysis, ash fusion temperature analysis and size distribution analysis of coal & ash were studied using TGA, Bomb Calorimeter, Ash Fusibility Determination and Sieve Shaker. The chemical compositions and microstructure of raw material and clinker located on combustor, seal pot and cyclone were investigated by the scanning electron microscope(SEM) with an energy dispersive X-ray spectrometer(EDS), ICP-AES, X-ray diffractometer(XRD). The domestic anthracite coal had much fine size portion which could cause after burning. Furthermore domestic coal had higher ignition temperature and lower volatile matter portion than bituminous coal, which finally ended in low combustion velocity. So it is fundamental to lengthen the furnace residence time to reach complete combustion. And it is possible to use auxiliary fuel but its dependence is low for CFBS because combustion temperature is at around 800~850℃, which range is very lower than general fine size coal combustion type. Fine size coal could do after burning, so it could cause temperature rising at combustor upper region and clinker formation by means of fouling. The short residence time of fine size coal in furnace can bring out high content of unburned carbon in fly ash, so it is necessary to reduce the fine size coal content. Assembling the result of chemical composition analysis, crystal structure analysis and EDS analysis of clinker, we could conclude that calcium in limestone and iron in bed material did the main effect in agglomeration.

전기자동차 운전을 위한 직류타여자 전동기의 쵸퍼제어

한경희,강승욱,김용주,정연택,이승환 明知大學校 産業技術硏究所 1994 産業技術硏究所論文集 Vol.13 No.-

Recently, the speed control of electric motorcar usually adapts the chopper control method by the development of power electronics and semiconductor manufacturing techniques. When the chooper control is adapted to the speed control of electric motorcar. D.C.series motor is mostly used because of the large starting torques and good control characteristics. But with respect to the economy, D.C. separately excited motor with shunt characteristics is profitable because of high adhesivesness and consumption. So, we compare the characteristics of the bilateral variable-ratio chopper controlled D.C. separately exited motor with that of the D.C. series motor theoretically and experimentally, and present the method which is able to simplify the main chopper circuit by selecting among the forward powering, forward regenerative braking, backward powering, and backward regenerative braking only by using the main chopper control signal. Also, control method is studied which has similar driving characteristics to that of the gasoline motorcar.

압착방법별 포도 착즙액의 품질특성

최희돈,김성수,김경탁,홍희도,김상희 한국식품영양학회 2002 韓國食品營養學會誌 Vol.15 No.3

캠벨과 거봉을 이용하여 여러 가지 압착방법에 따른 착즙액의 이화학적 및 관능적 특성을 조사하였다. 수율의 경우 캠벨, 거봉이 동일하게 냉압처리보다는 온압처리가, 온압처리에서도 낮은 온도보다는 높은 온도에서 수율이 높게 나타났으며, 또 온압 · 펙틴분해 병행처리가 각각 83.5% , 87.3%로 가장 높은 수율을 나타내었다. 또한 당도와 아미노테 질소도 열처리온도의 상승 및 압착방법의 병행에 의해 감소하는 것으로 나타났다. 적정산도는 캠밸과 거봉이 압착방법에 따라 각각 0.86 ~ 1.00%, 0.60 ~ 0.69%로 거봉에 비해 캠벨의 산도가 높았으며, 열처리온도가 산도 증감에 더 큰 영향을 미치는 것으로 나타났다. 그리고 압착방법에 따른 착즙액에 대한 관능검사 결과 열처리 온도의 상승 및 착즙액에 대한 관능검사 결과 열처리온도의 상승 및 압착방법의 병행에 의해 떫은 맛과 산맛의 강도가 강하여지고 이들 처리구의 기호도가 높은 것으로 나타났다. The physicochemical and sensory properties of Campbell Early and Gerbong juices prepared by various pressing methods were studied. The yields of these juices by mixed method were 83.5% and 87.5%, the highest value of various pressing methods. And soluble solids and amino nitrogens of them decreased as heating temperature increased and was lowest when mixed method was performed. Titratable acidities of Campbell Early juice was 0.86 ~ 1.00%, higher than that of Gerbong juice, 0.60 ~ 0.69%. Also the strength of astringent taste and sour taste of Campbell Early and Gerbong juice increased as heating temperature increased, and increased strength of these tastes gave good sensory evaluation to grape juices.

ATM망의 가상경로 상에서 효율적인 대역관리

고승일,고성택,김경식,김경연,최영복 濟州大學校 産業技術硏究所 1998 산업기술연구소논문집 Vol.9 No.2

ATM(asynchronous transfer mode) is able to realize the full integration of various kinds of services. Effective bandwidth allocations using statistical multiplexing gain have been studied for the full integration of different kinds of services. In this paper. we present call admission control algorithm using complete bandwidth sharing and reserved bandwidth sharing. Complete bandwidth sharing is an efficient way for utilization of bandwidth. Reserved bandwidth sharing is an efficient way for preventing reverse pecking order. Using these two bandwidth allocations is an effective way for bandwidth utilization and stopping reverse pecking order. A computer simulation shows the results of the algorithm

Duplication 9p Syndrome 1례

이미경,노영래,김영훈,백청순,신미경,이진,장필상,김진택,이권행,황경태 대한소아과학회 2002 小兒科 Vol.45 No.9

맥엽 및 항산화 조성물의 생리 기능적 특성에 관한 연구 : 아질산염 소거능을 중심으로 Study on the Nitrite Scavenging Effect

이성희,홍이진,박형근,주상섭,김경탁 한국응용생명화학회 2003 Applied Biological Chemistry (Appl Biol Chem) Vol.46 No.4

맥엽과 이를 이용한 항산화 조성물을 제조하여 이에 존재하는 nitrite scavenging 효과와 이에 따른 발암원으로 부터의 보호 효과를 조사한 결과는 다음과 같다. 맥엽과 항산화 조성물 모두 수층에 비하여 메탄올층에서 아질산염 소거능이 2배 이상 높게 나타나 M-BL50의 0.01㎎/㎖ 농도에서 약 64.3%, M-AM 0.01㎎/㎖의 처리군이 이보다 약간 높은 68.3% 정도로 나타내었다. 마우스 단핵구 기원인 RAW 264.7(macrophage, mouse)에 맥엽과 항산화 조성물의 수층과 메탄올층을 처리하고 세포 생존율을 측정한 결과 수층 처리군에 비해 메탄올층 처리군에서 모두 세포 생존율이 더 낮게 측정되었으며 모든 시료에서 농도의존적으로 세포 증식이 억제되었다. 특히, M-AM을 처리한 군의 경우 모든 농도에서 가장 낮은 세포 생존율을 나타내어 항산화물 첨가에 의해 세포 증식 억제 효과가 상승됨을 알 수 있었으며, IC_(50) 수치 또한 메탄올층과 A-AM 시료 처리군에서 현저히 낮은 수치를 나타내었다. 또한 세포 내 아질산염 소거능을 측정한 결과 역시 마찬가지로 맥엽 입자 크기에 따른 차이는 나타나지 않았으며 수층 처리군에 비해 메탄올층 처리군과 항산화물을 첨가한 군에서 모두 높은 소거능을 나타내어 맥엽 및 기타 항산화물을 섭취함으로써 체내에서의 니트로사민 생성을 억제시킬 수 있을 것으로 예상된다. This study was conducted to estimate the biofunctional characteristics, namely nitrite scavenging effect of barley leaves (BL) and their mixture (AM) with other antioxidants. Aqueous or methanol extracts were obtained from BL and AM. Aqueous and methanol extracts from barley leaves had relatively higher nitrite scavenging effects and its activities and contents increased in a concentration-dependent manner. The activities and contents of methanol extracts obtained from BL and AM were higher than those of aqueous extracts. Especially, AM containing BL and other antioxidant mixture had the highest activities and contents increased in a concentration-dependent manner. BL or AM were added to macrophage cells of RAW 264.7 Survival rates of the cells treated with BL and AM were measured to be different. IC_(50) value decreased in a concentration-dependent manner by the addition of aqueous or methanol extracts from BL and AM. Especially, methanol extracts of AM had the highest nitrite scavenging effects. Thus, BL and AM may have protective effect against carcinogen and immune ability against reactive molecules through NO (nitric oxide) signal pathway. From the above results, barley leaves appear to contain natural anticancer and immune-related agents and may have potentiality to be used as functional food ingredients.

Inhibitory Effects of Resveratrol Derivative, SY-015 on Progression of the Human Promyelocytic Leukemia (HL-60) Cell Line

Kim Sun Yeou,Choi Sang Yoon,Kim Sanghee,Kang Hee Kyung,Kim Sung Soo,Kim Kyung Tack,Hong Hee Do,Kim Young Chan,Park Soojin 대한약학회 2004 大韓藥學會 總會 및 學術大會 Vol.2004 No.2