추황배(Pyrus pyrifolia Nakai cv. Chuhwangbae) 과피로부터 1종의 Sterol과 3종의 배당체 화합물의 단리·동정

이유건(Yu Geon Lee1),조정용(Jeong-Yong Cho),이현주(Hyun Joo Lee),이용현(Yong Hyun Lee),이상현(Sang-Hyun Lee),한태호(Tae-Ho Han),김월수(Wol-Soo Kim),박근형(Keun-Hyung Park),문제학(Jae-Hak Moon) 한국식품과학회 2013 한국식품과학회지 Vol.45 No.5

본 연구에서는 배의 유용성 증명을 위한 일환으로 배의 화학성분을 분자수준에서 밝히고자 하였다. 이에 배 과피 MeOH 추출물을 용매분획하여 얻은 EtOAc-산성 분획과 EtOAc-중성분획을 대상으로 Sephadex LH-20, silica gel, 그리고 ODS colmn chromatography와 HPLC를 이용하여 정제 및 단리하였다. 그 결과, EtOAc-산성 분획과 EtOAc-중성 분획으로부터 각각 2종씩의 화합물을 단리하였다. 단리된 화합물 1-4는 1H- 및 13C-NMR 분석을 통하여 각각 (S)-(+)-2-cis-abscisic acid O-β-D-glucopyranosyl ester (화합물 1), 1-[4-O-β-D-glucopyranosyl]phenyl ethanone(piceoside, 화합물 2), β-sitosterol (화합물 3), 그리고 β-sitosteryl 3-O-β-D-glucopyranoside (화합물 4)로 동정되었다. 단리된 3종의 배당체 화합물(화합물 1, 2, 4)들은 본 연구에 의해 배로부터 처음 동정되었으며, 화합물 3은 추황배로부터 처음 동정되었다. 본 연구결과가 배 함유 성분연구는 물론 배의 기능성 해명 연구에도 추후 중요한 기초자료로 활용되길 기대한다. We isolated and identified antioxidants from acidic and neutral ethyl acetate fractions of the peel of pear (Pyrus pyrifolia N. cv. Chuhwangbae). We isolated 4 compounds from the methanol extract, by using 3 different types of column chromatography (Sephadex LH-20, silica gel, and octadecylsilane) and preparative HPLC. We identified the isolated compounds as (S)-(+)-2-cis-abscisic acid O-β-D-glucopyranosyl ester (compound 1), 1-[4-O-β-D-glucopyranosyl]phenyl ethanone (picroside, compound 2), β-sitosterol (compound 3), and β-sitosteryl 3-O-β-D-glucopyranoside (compound 4) by nuclear magnetic resonance analysis. We are the first to report the identification of compounds 1, 2, and 4 from pear.

단상 유도형 동기 전동기(LSPM)의 특성해석에 관한 연구

정대성,김승주,이진헌,최재학,이주,Jung, Dae-Sung,Kim, Seung-Ju,Lee, Jin-Hun,Choi, Jae-Hak,Lee, Ju 한국조명전기설비학회 2007 조명·전기설비학회논문지 Vol.21 No.3

가전분야에서의 전동기 효율향상을 통한 에너지 소비절감 효과는 상당히 크지만 이를 위한 전동기의 설계/해석 기술 확보가 아직은 미흡한 상태이다. 이에 따라 유도형 동기전동기가 제안되었지만, 유도형 동기 전동기는 유도전동기와 통기전동기의 특성을 동시에 가지고 있어, 해석 및 설계가 쉽지 않다. 따라서 본 논문에서는 기존의 냉장고 압축기용 전동기인 단상유도전동기를 대처할 수 있는 단상 유도형 동기전동기를 이용해 파라미터에 따라 특성이 어떻게 바뀌는가에 대해 서술하였다. 그에 따라 단상유도전동기의 정상상태 특성을 해석하고 제안모델의 성능을 기존모델과 비교하고 실험하여 해석결과의 신뢰성을 검증한다. 또한 본 논문에서는 제안모델의 기존 고정자 형상이나 권선 스팩을 유지하고 회전자의 형상이나 구조만을 변경시켜 성능향상을 도모하였다. 해석방법으로는 전자장 수치 해석적인 방법으로 널리 이용되고 있는 유한요소법(Finite Element Method : FEM)을 이용하였다. Electric motor efficient improvement from home appliance field is important to the effect reducing the energy consumption. But the electric motor design/analysis technology is still insufficient. Specially the electric motor design/analysis technology of satisfying characteristic of both the induction motor and the synchronous motor such as Line start permanent motor. Therefore the electric motor design/analysis technology is urgently demanded reliability. This paper proposes the sing1e-phase line-start permanent magnet motor to develop the motor it with be able to alternate the sing-phase induction motor it is a refrigerator compressor motor. The sing-phase induction motor is analyzed in the steady state. And we have a certification test to compare our single-phase line-start permanent magnet motor with the sing-phase induction motor. In order to improve the performance, the stator of the single-phase line-start permanent magnet motor is same as the stator of the sing-phase induction motor and changes the rotor form and has the permanent magnet. It used the Finite Element Method(FEM) which is widely used with electronic-magnetic field numerical analysis method.

성토사면에 적용된 Soil Nailing의 주면마찰특성 연구

이성철,김명학,김상현,윤성학 인제대학교 2001 仁濟論叢 Vol.16 No.1

Soil Nailing 공법은 사면안정을 목적으로 보강재를 사용하여 지반을 보강하는 현장 지반보강 공법의 일종이다. 지금까지는 일반적으로 Soil nailing이 주로 절토사면을 보강하는 기술로 사용되고 연구되어 왔으나 본 논문에서는 붕괴된 사면에 재성토를 시행한 현장에 대한 보강공법으로서의 적용성을 연구하였다. 이를 위하여 네일에 스트레인 게이지를 부착하고 현장인발실험을 수행하여 최대인발하중을 조사하고 각 지층에서 발휘되는 단위 주면마찰력을 산정하였다. 그리고 본 연구에서 얻어진 겉보기 평균 주면마찰력을 일반적인 절토사면에서 현장인발실험을 수행한 다른 사례의 겉보기 평균주면마찰력과 비교분석해 보았다. Soil nailing is in-situ ground improvement technique of reinforcing soils using passive inclusions for the purpose of slope stability. Also soil nailing, in general, was used and studied as a reinforcement technique at cut slope, but this paper presents the results of study for soil nailing application as a reinforcement technique at the banking over slided slope. In-situ pull-out tests of nails, instrumented with strain gauges, were performed to investigate the maximum pull-out load and to calculate the unit side resistance in each different layer, And the apparent average unit side resistance of this study was compared with that of other sites installed at cut slop.

미세입자(PM_(2.5))의 배출원 구성물질 성분비 개발에 관한 연구

이학성,강충민,강병욱,이상권 한국대기환경학회 2004 한국대기환경학회지 Vol.20 No.3

The purpose of this study was to develop the PM_(2.5) source profiles, which are mass abundances (fraction of total mass) of a chemical species in PM_(2.5) source emissions. The source categories studied were soil, road dust, gasoline and diesel vehicles, industrial source, municipal incinerator, coal-fired power plant, biomass burning, and marine. The chemicals analyzed were ions, elements, and carbons. From this study. soil source had the crustal components such as Si, AI, and Fe. In the case of road dust, Si, OC, Ca, Fe had large abundances. The abundant species were SO₄^(2-), Cl^(-), NH₄^(+), and EC in the gasoline vehicle and EC, OC, Cl^(-), and SO₄^(2-) in the diesel vehicle. The main components were SO₄^(2-), S, NH₄^(+), and EC in the industrial source using bunker C oil as fuel. ^(-), NH₄^(+), Fe, and OC in the municipal incinerator source, and Si, Al, SO₄^(2-), and OC in the coal-fired power plant source. In the case of biomass burning, OC, EC, and CI- were mainly emitted. The main components in marine were Cl^(-), Na^(+), and SO₄^(2-).

NMR에 依한 trans-2-Butene-dial dioxime의 立體構造에 關한 硏究

李學沂,沈相喆,嚴在國 慶北大學校 1976 論文集 Vol.21 No.-

The structure of trans-2-butene-dial dioxime was investigated by means of NMR spectroscopy. Its conformer was found to have the planar structure conjugated with the double-bonds from the vicinal spin-spin coupling constants. The configurations of two oxime group were investigated from the solvent effects and assigned as the perfect symmetric structures, mixture of "syn-syn" and "anti-anti" forms.

다양한 방법을 이용한 유방축소술의 임상적 적용

김학수,이상원,정재호,설정현 大韓成形外科學會 2001 Archives of Plastic Surgery Vol.28 No.2

여름철 가정집에서의 미세입자 농도 특성

이학성 서원대학교 응용과학연구소 2001 응용과학연구 Vol.10 No.1

Acidic air pollutants were collected to characterize indoor air quality in a residential area in the summer. All indoor and outdoor samples were measured simultaneously using an annular denuder system(ADS) in Seoul. The data set was collected from July 26 to September 11, 1997. Mean indoor/outdoor ratios measured from this study were: 0.78 for PM2.5(dp<2.5㎛); 0.90 for SO42-; 0.68 for NO3-; and 0.79 for NH4+. PM2.5 indoor concentrations were dependent upon the outdoor levels. A tracer-gas decay technique with sulfur hexafluoride(SF6)as the tracer gas was used to estimate the air exchange of a private home in the summer. The average air exchange rate was 23.7hr-1. The PM2.5, SO42-, NO3- and NH4+ deposition velocities calculated were 0.0.42, 0.17, 0.69 and 0.39cm/sec, respectively.

Comparison of the Pharmacological Effects of Roasted and Non-roasted Zizyphi Spinosi Semen: Differences in Chemical Constituents

홍학기, 이기남, 마유안, 김윤배, 남상윤, 송인섭, 문동철, 오기완 충북대학교 동물의학연구소 2008 Journal of Biomedical and Translational Research Vol.9 No.3

본문참고

鐵카보닐알카리염을 利用한 Allylamine과 Aromatic aldehyde와의 反應性에 關한 硏究

李學沂,沈相喆 慶北大學校 1976 論文集 Vol.21 No.-

Aromatic aldehyde react with allylamine in the presence of tetracarbonylhydridoferrate to give its corresponding propylamine in good yields. Effects of reaction conditions such as temperature and molar(ferrate/aromatic aldehyde/allylamine) on the reaction has been examined.

산성오염물질에 대한 실내 ·외 농도 비교

이학성 서원대학교 응용과학연구소 2000 응용과학연구 Vol.9 No.1

The purpose of this study was to quantitatively determine the indoor infiltration of pollutants of outdoor origin. The relationship between indoor and outdoor air is dependent, to a large extent, on the rate of air exchange between these two environments. Mean indoor/outdoor ratios measured from this study were: 1.15 for PM??(d??<2.5μm); 1.00 for SO₄??; 0.52 for NO₃??; and 0.67 for NH₄??. INdoor PM? concentration were greater than outdoor levels. However, indoor concentrations of NO₃?? and NH₄?? were less than outdoors. In the case of SO₄??, the indoor and outdoor concentrations were similar. Indoor concentrations of PM??, SO₄?? and NO₃?? were dependent upon the outdoor concentrations. The NO₃?? and NH₄?? deposition velocities calculated were 0.16 and 0.09cm/sec, respectively.