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이원균,이홍섭,황희용 江原大學校 産業技術硏究所 2007 産業技術硏究 Vol.27 No.B
In this paper, the exact analysis of the parallel coupled line with open stub is presented. This structure shows LPF characteristics with broad stopband and sharp skirt characteristics. We derived the exact Z-matrix expression of the structure. In order to show the validation of the expression we designed 3^(th) order Chebyshev LPF using the structure. The simulated data excellently agreed with the predicted values by the calculation using the derived expression.
이원희,정순원,구경완,이명섭 永同大學校 1997 硏究論叢 Vol.3 No.1
본 논문에서는 기존의 냉매 대신에 열전 소자를 사용하여 구성한 냉수기가 갖는 여러 가지 장점 및 냉수기의 중요 소자인 TEC 모듈(Thermo Electric Cooler Module)에 대한 최대 효율 구동 방법 등을 연구하였다. 또, 열교환기의 재질 및 모양, 방열판과 냉각팬의 크기 등을 변화시키면서 냉수기로서 최적의 효율을 가질 수 있도록 냉수기를 설계하였고, 그 설계를 바탕으로 실험을 하여 TEC 모듈(Thermo Electric Cooler Module)을 이용한 냉수기가 상품화 가능성이 있는지를 검토하였으며, 그 결과를 기술하였다. We developed a new cooling system which applies TEC module using peltier effect. Our cooling system has better effiency and make smaller pollution than conventional cooling system. We applies that cooling system to making cool water dispenser. We designed the cold water dispenser of optimum effiency varying material, shape, and size of heat sink and cooling fan. The possibility of a commodity on this designed cold water dispenser is investigated.
적외선방사카메라를 이용한 변압기 부싱 온도분포 모니터링
임장섭,이우선,이영식 조선대학교 에너지.자원신기술연구소 2002 에너지·자원신기술연구소 논문지 Vol.24 No.2
An electrical accident such as mishap electricity institution occurs frequently because of the increase of demand for electricity, complexity of electricity institution. The techniques that discovered a mishap to electricity institution are electric signal method and supersonic waves method, thermal sensing method by infrared rays. The IRR-camera which is effective monitoring method of electricity institution is diffused in industrial field. Specially, infrared rays monitoring can perceive heat which was visually poor observed objection. Also, infrared rays monitoring can monitor an area of difficulty of access of work human power. In this study, infrared rays monitoring of a transformer substation is periodically performed. The connection between possibility of application and operation, blazing fire occurrence and progress process of body and bushing of large capacity transformer are performed by IRR-camera.
심원근,이은현,강현아,장규섭 충남대학교 농업과학연구소 1995 농업과학연구 Vol.22 No.2
In order to distinguish the honey in the market whether it is real or not simply and conviniently, the changes of water activity was investigated due to the addition of starch syrup and sucrose solution to the honeys such as Korean, Acacia, Chestnut and Mixed. The regression equations were obtained to predict the water activity of the honeys. In general, the honey was below 21% in moisture, below 0.6% in ash, 420 to 710cP in the viscosity, 0.57 to 0.62 in the water activity and 77 to 80brix in sugar content. The water activity of the samples were higher as the quantity of starch syrup and sucrose solution added increased. Starch syrup was more influence than sucrose solution. The regression equations between water activity and starch syrup concentration of honeys were obtained and R^2 value were higher than 0.90.
허근,신억섭,이상훈,안원효 영남대학교 약품개발연구소 1996 영남대학교 약품개발연구소 연구업적집 Vol.6 No.-
This study was done to determine the effect of lead acetate on the activities of the hepatic cytosolic xanthine oxidase and aldehyde oxidase which were well known as oxygen free radical generating enzyme in vitro. Lead ion accelerated the formation of lipid peroxide and the increment of xanthine oxidase(type O) activity and the type conversion ration from xanthine dehydrogenase to xanthine oxidase dose-dependently. But xanthine dehydrogenase(type D) activity was decreased. Aldehyde oxidase activity was not changed by lead ion. These data suggested that lead-induced cellular toxicity may be concerned partially with xanthine oxidase mediated lipid peroxidation.
Lee, Jae Won,Ji, Seung-Heon,Lee, Young-Seob,Choi, Doo Jin,Choi, Bo-Ram,Kim, Geum-Soog,Baek, Nam-In,Lee, Dae Young MDPI 2017 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.18 No.6
<P>(1) Background: <I>Panax ginseng</I> root is one of the most important herbal products, and the profiling of ginsenosides is critical for the quality control of ginseng roots at different ages in the herbal markets. Furthermore, interest in assessing the contents as well as the localization of biological compounds has been growing. The objective of this study is to carry out the mass spectrometry (MS)-based profiling and imaging of ginsenosides to assess ginseng roots at different ages; (2) Methods: Optimal ultra performance liquid chromatography coupled to quadrupole time of flight/MS (UPLC-QTOF/MS) was used to profile various ginsenosides from <I>P. ginseng</I> roots. Matrix-assisted laser desorption ionization (MALDI)-time of flight (TOF)/MS-based imaging was also optimized to visualize ginsenosides in ginseng roots; (3) Results: UPLC-QTOF/MS was used to profile 30 ginsenosides with high mass accuracy, with an in-house library constructed for the fast and exact identification of ginsenosides. Using this method, the levels of 14 ginsenosides were assessed in <I>P. ginseng</I> roots cultivated for 4, 5, and 6 years. The optimal MALDI-imaging MS (IMS) was also applied to visualize the 14 ginsenosides in ginseng roots. As a result, the MSI cross sections showed the localization of 4 ginsenoside ions ([M + K]<SUP>+</SUP>) in <I>P. ginseng</I> roots at different ages; (4) Conclusions: The contents and localization of various ginsenosides differ depending on the cultivation years of <I>P. ginseng</I> roots. Furthermore, this study demonstrated the utility of MS-based profiling and imaging of ginsenosides for the quality control of ginseng roots.</P>
Lee, Hwa Dong,Lee, Won‐,Hee,Roh, Eunmiri,Seo, Chang‐,Seob,Son, Jong‐,Keun,Lee, Seung Ho,Hwang, Bang Yeon,Jung, Sang‐,Hun,Han, Sang‐,Bae,Kim, Youngsoo Blackwell Publishing Ltd 2011 Experimental dermatology Vol.20 No.9
<P><B>Abstract: </B> Microphthalmia‐associated transcription factor (MITF) is inducible in response to cAMP through the cAMP‐responsive element–binding protein (CREB) and plays a pivotal role in the melanocyte‐specific expression of tyrosinase or tyrosinase‐related proteins (TRPs) for melanin biosynthesis. Manassantin A from <I>Saururus chinensis</I> inhibits cAMP‐induced melanin production in B16 melanoma cells. Here, we focused on molecular basis of the antimelanogenic activity. Manassantin A consistently inhibited the cAMP elevator 3‐isobutyl‐1‐methylxanthine (IBMX)‐ or dibutyryl cAMP‐induced melanin production in B16 cells or in melan‐a melanocytes by down‐regulating the expression of <I>tyrosinase</I> or <I>TRP1</I> gene. Moreover, manassantin A suppressed MITF induction through IBMX‐activated CREB pathway, directly inhibiting the Ser‐133 phosphorylation of CREB. However, manassantin A did not affect IBMX‐increased cAMP levels in these cells but also other cAMP‐dependent melanogenic pathways through post‐translational modifications of MITF. This putative molecular mechanism of manassantin A in the inhibition of melanin production suggests its pharmacological potential in skin hyperpigmentation.</P>