SPTE 및 GC-MS를 이용한 한국산 및 중국산 생강의 향미 특성 분석

유주원,김남선,김건,이동선 서울여자대학교 자연과학연구소 2005 자연과학연구논문집 Vol.17 No.-

Volatile flavor components of the Korean and the Chinese ginger (Zingiber officinale Roscoe) have been studied in this paper. The accurate characterization of the flavors from the ginger rhizomes was carried out by head space solid phase trapping-solvent extraction (SPTE) and gas chromatography-ion trap mass spectrometry. Predominant compounds of the Korean ginger flavors are zingiberene, β-phellandrene, camphene, β-sequiphellandrene and α-farnesene, whereas those of the Chinese ginger flavors are β-phellandrene, camphene, zingiberene and α-farnesene. In addition, α-pinene, α-curcumene, β-pinene and β-bisabolene are also found as minor compounds of ginger flavors. A new finding in this work is that limonene, β-sesquiphellandrene, germacrene D, and zingiberene are critical index to distinguish the origin between the Korean ginger and the Chinese ginger.

Mn-Zn-Fe Ferrite系 材料의 磁氣的 性質에 관한 硏究

朴元柱 영남이공대학 1982 論文集 Vol.11 No.-

The quality factor and A.C inital permeability for various sintering, cooling atmosphere conditions and adding components were measured to prepare ferrites. In this paper, the magnetic properits of Mn-Zn-Fe ferrites prepared by this method with various sintering and cooling atmospheres are discussed. The experimental results indicate that best property in a curve of the A.C initial permeability occurs when the specimen was sintered in the nitrogen atmosphere and coold in the air atmosphere with 0.7[wt%] of cobalt addition. We found that two peaks appear on the permeability vs Temperature curve in the temperature range from about -20 to + 250C.

流動空氣의 放電特性解析

朴元柱,李廣植 영남대학교 공업기술연구소 1984 연구보고 Vol.12 No.1

This paper shows the characteristics of sparkover discharge in flowing air with needle-needle gap. The results abtained from this study are as follows. 1) The sparkover voltage shows the nearly maximum value when the Reynolds number of flowing air ranges 9×10⁴to 10??. 2) Discharge path of flowing air can be analyzed by the theories of velocity for the gas. 3) The proportion of Sparkover voltage to Reynolds number increase with decreasing Reynolds number.

放射電磁波에 의한 絶緣診斷에 관한 硏究

김영훈,박원주,이동인,김충년,이광식 嶺南大學校 工業技術硏究所 1995 工業技術硏究所論文集 Vol.23 No.1

In this paper, the detect of insulation disorder and process degree of insulation degradation of power apparatus, the waveform of discharge current, magnitude of discharge and frequency spectrum of the electromagnetic wave radiated from partial discharge by simulating with needle-to-plane electrode geometry and dielectric with artificial void, were investigated. The results obtained can be summarized as follows. 1) Streamer pulses occur near the positive cycle and trichel pulses near the peak of negative cycle of applied voltage. At that time, discharge magnitude of trichel pulses and streamer pulses was observed about 200[pC] and 500[pC] in air, respectively. 2) The level and frequency spectrum of radiated electromagnetic waves were increased about 20∼40[dB] at under 200[MHz] and about 2∼3[dB] above 200[MHz], compared with background noises. 3) A sudden change of discharge magnitute above 20∼30[pC] was observed with various applied voltages, but the magnitude showered to tend to saturate at 300∼300[pC] in dielectric. 4) The level and frequency spectrum of radiated electromagnetic waves were increased about 3∼6[dB] under 200[MHz]and about 2∼3[dB] above 200 [MHz], compared with background noises.

Double Probe 측정법에 의한 RFI 플라즈마 특성에 관한 연구

전용주,박원주 영남대학교 공업기술연구소 1999 工業技術硏究所論文集 Vol.27 No.1

Electron temperature and electron density were measured in RFICP(Radio-Frequency Inductively Coupled Plasma) by using double probe method. Measurements were conducted in argon discharge for pressures from 30mTorr to 60mTorr and input RF powers from 50W to 200W and gas flowrates from 3sccm to 12sccm. Radial distributions of electron temperature and electron density were measured for discharges for the same aspect ratio (R/L=1). Electron temperature was found to depend on pressures and gas flowrates, but just weakly on powers. Electron temperature was almost constant while input RF power was increased, and decreased with increasing pressures, and that electron temperature had a tendency to get lower at low gas flowrates when argon gas flowrate was increased, but it is considered that there is just slight changes in tendency, if any, with increasing gas flowrates. Electron density depended on all of pressures, input RF powers and gas flowrates. Electron density increased with increasing input RF powers, and was kept constant for the gas flowrates, and that it increased with increasing gas flowrates. Radial distribution of the electron temperature was seen to gradually increase from plasma center toward plasma environs. Radial distribution of the electron density was peaked at the plasma center. These results make it easier for us to understand the generation and stay-on mechanism of RFICP.

방전관용 전극개발 및 특성에 관한 연구

안성환,황동원,최준영,송시준,전용우,박원주,이광식 영남대학교 공업기술연구소 2001 工業技術硏究所論文集 Vol.29 No.1

This paper describes the development of sputtered tungsten electrode for discharge tube by making use of Sputtering method using plasma. The Xe discharge tube was designed and fabricated by using sputtered tungsten electrode, and the ICCD(Intensified Charged Coupled Device) and monochromator were used in order to observe the discharge image distribution and to measure the signal intensity. As a result, the emission light form the electrode was spreaded almost uniformly over a wide wavelength band, and the discharge image distribution and the signal intensity show quite a uniform distribution. The emission light from the Xe discharge tube was peaked at 488[nm] and 648[nm].

Mesh형 내부전극을 사용한 2중 원통형 오존발생기의 온도 의존특성

전병준,이상근,송현직,박원주,이광식 영남대학교 공업기술연구소 1999 工業技術硏究所論文集 Vol.27 No.1

Nowadays, environment pollution caused by development of industrial society becomes a serious social problem. So, ozonized gas is suggested as a counter plan against the problem. In this paper, a double cylindrical type ozonizer has been designed and manufactured to improve ozone yield by cooling external electrode. The ozonizer equipped with three electrodes(central, internal and external electrodes) and two gaps. Discharge and ozone characteristics are described in this paper by varying flow rate( Q ) of oxygen suppling gas, temperature of cooling gas and supplied voltage.

레이저 형광법에 의한 프로세싱 플라즈마중의 입자 계측에 관한 연구

최상태,이광식,하장호,전용우,박원주 嶺南大學校 工業技術硏究所 1998 工業技術硏究所論文集 Vol.26 No.2

Armorphous materials have various structures that is determined by different manufacturing conditions. That is, the photoelectric characteristics of films manufactured by different conditions are totally different. The growth mechanism of a-Si should be understood in order to controll the characteristics and structures of these kinds of materials. In this study, we try to elucidate the particle behaviours in a processing plasma using a low pressure glow discharge. And because of difficulties understanding discharge mechanism, we have done the processing so far depending on the experimental methods that compare the thin film produced by varing discharge parameter with the results of micromachinary. But, this has a limitation in the development because it regards the plasma as a blackbox. Therefore, because it needs to observe the discharge parameters and plasma background gas systematically, we try make sure that the particle behaviours be made clean by using laser fluorescence method which is predominant in a phenomina measurement and special resolution.

Plenary Session l : Hepatic Vein Arrival Times Using a Microbubble Contrast Ultrasonography can Predict Disease Severity Non-invasively in Patients with Alcoholic Liver Disease

( Won Ki Hong ),( Moon Young Kim ),( Soon Koo Baik ),( Youn Zoo Cho ),( Hye Won Hwang ),( Jin Hyung Lee ),( Myeong Hun Chae ),( Seung Yong Shin ),( Jung Min Kim ),( Mee Yon Cho ),( Sang Ok Kwon ) 대한간학회 2013 춘·추계 학술대회 (KASL) Vol.2013 No.1

Background: A reliable non-invasive assessment of the severity is essential in the management of chronic liver disease. The hepatic vein arrival time (HVAT) as assessed by microbubble contrast-enhanced ultrasonography (CEUS) has been known to show good correlation with histological grade in HCV related liver disease. However, little has been known about the relationship with alcoholic liver disease. We investigated the utility of HVAT in prediction of histological grade of alcohol related chronic liver disease. Methods: One-hundred twenty seven patients with biopsy proven alcohol related chronic liver disease were studied prospectively. Histological grades were estimated by METAVIR fibrosis scoring system (F0-F4). After an overnight fast, a bolus of contrast agent (SonoVue) was injected into an antecubital vein and signals were recorded from the right or middle hepatic veins for analysis. HVATs were calculated as the time from injection to a sustained rise in Doppler signal 10% above baseline. Results: Mean HVAT from F0 to F4 cirrhosis showed a significant progressive shortening of 26.1±5.5 (F0, 7), 20.3±1.4 (F1, 9), 17.4±0.6 (F2, 12), 15.1±1.4 (F3, 34) and 12.7±1.8 (F4, 65) seconds, respectively (P<0.001). The area under the receiver operating characteristic curve (AUROC) was 0.924 for F4 cirrhosis and the sensitivity, specificity for F4 cirrhosis for an HVAT cutoff value of 14.8 sec were 87.7%, 82.3%, respectively. In addition, HVAT also showed significant correlation with Child- Pugh`s score (P<0.001, r2=0.406), the presence of large esophageal varices (P=0.002), ascites (P<0.001) and the history of esophageal variceal hemorrhage (P=0.036). Conclusions: HVAT using a microbubble CEUS could be effective noninvasive method in assessment of the histological severity and disease severity in alcohol related chronic liver disease.

Original Article : The usefulness of non-invasive liver stiffness measurements in predicting clinically significant portal hypertension in cirrhotic patients: Korean data

( Won Ki Hong ),( Moon Young Kim ),( Soon Koo Baik ),( Seung Yong Shin ),( Jung Min Kim ),( Yong Seok Kang ),( Yoo Li Lim ),( Young Ju Kim ),( Youn Zoo Cho ),( Hye Won Hwang ),( Jin Hyung Lee ),( Myeo 대한간학회 2013 Clinical and Molecular Hepatology(대한간학회지) Vol.19 No.4

Background/Aims: Liver stiffness measurement (LSM) has been proposed as a non-invasive method for estimating the severity of fibrosis and the complications of cirrhosis. Measurement of the hepatic venous pressure gradient (HVPG) is the gold standard for assessing the presence of portal hypertension, but its invasiveness limits its clinical application. In this study we evaluated the relationship between LSM and HVPG, and the predictive value of LSM for clinically significant portal hypertension (CSPH) and severe portal hypertension in cirrhosis. Methods: LSM was performed with transient elastography in 59 consecutive cirrhotic patients who underwent hemodynamic HVPG investigations. CSPH and severe portal hypertension were defined as HVPG ≥10 and ≥12 mmHg, respectively. Linear regression analysis was performed to evaluate the relationship between LSM and HVPG. Diagnostic values were analyzed based on receiver operating characteristic (ROC) curves. Results: A strong positive correlation between LSM and HVPG was observed in the overall population (r2=0.496, P<0.0001). The area under the ROC curve (AUROC) for the prediction of CSPH (HVPG ≥10 mmHg) was 0.851, and the sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) for an LSM cutoff value of 21.95 kPa were 82.5%, 73.7%, 86.8%, and 66.7%, respectively. The AUROC at prediction of severe portal hypertension (HVPG ≥12 mmHg) was 0.877, and the sensitivity, specificity, PPV, and NPV at LSM cutoff value of 24.25 kPa were 82.9%, 70.8%, 80.6%, and 73.9%, respectively. Conclusions: LSM exhibited a significant correlation with HVPG in patients with cirrhosis. LSM could be a non-invasive method for predicting CSPH and severe portal hypertension in Korean patients with liver cirrhosis.