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Hyun, S.,Suh, Y.J.,Shin, K.H.,Nam, S.I.,Chang, S.W.,Bae, K. Pergamon Press 2015 QUATERNARY INTERNATIONAL Vol.384 No.-
Carbon isotope of total organic carbon (δ<SUP>13</SUP>C<SUB>org</SUB>) and long-chain n-alkanes, which are terrestrial plant biomarkers, and their compound-specific carbon isotope ratios (δ<SUP>13</SUP>C<SUB>ALK</SUB>) were investigated in the sediment of the Jeongok-ri Paleolithic Site in central Korea to interpret changes in paleovegetation and paleoclimate. The δ<SUP>13</SUP>C<SUB>org</SUB> ranged between approximately -24%% and -27%%, suggesting different organic matter sources. Relatively lighter δ<SUP>13</SUP>C<SUB>org</SUB> occurred in lower part and the occurrence of heavier δ<SUP>13</SUP>C<SUB>org</SUB> in upper part may indicate terrestrial C<SUB>3</SUB> plant dominance and/or a mixture of C<SUB>3</SUB> and C<SUB>4</SUB> plants, respectively. The patterns of n-alkane distribution were characterized by a continuous predominance of odd-numbered n-alkanes, particularly nC<SUB>29</SUB> and nC<SUB>31</SUB>, and by variation in the distribution of even-numbered n-alkanes. Total concentration of n-alkanes and distributions of each number of n-alkanes are quite different over time, suggesting paleovegetation changes. The average chain length (ACL) and carbon preferences index (CPI) showed gradual variations with distinctive switching points at about 160 ka. This variation reflecting changes in paleovegetation type, is coincident with those of the δ<SUP>13</SUP>C<SUB>org</SUB>. Individual n-alkane isotopes, δ<SUP>13</SUP>C<SUB>ALK</SUB>, ranged between -18.64%% and -38.09%%, suggesting different sources of n-alkanes. Although some petrogenic sources of n-alkanes were possible, the distribution of n-alkanes and their δ<SUP>13</SUP>C<SUB>ALK</SUB> support paleovegetation and paleoclimatic variations in Jeongok-ri Paleolithic site, Korea for the last 300 ka.
Safety assessment of trans-tympanic photobiomodulation
Moon, T. H.,Lee, M. Y.,Jung, J. Y.,Ahn, J. C.,Chang, S. Y.,Chung, P. S.,Rhee, C. K.,Kim, Y. H.,Suh, M. W. Springer Science + Business Media 2016 Lasers in medical science Vol.31 No.2
<P>We evaluated functional and morphological changes after trans-tympanic laser application using several different powers of photobiomodulation (PBM). The left (L) ears of 17 rats were irradiated for 30 min daily over 14 days using a power density of 909.1 (group A, 5040 J), 1136.4 (group B, 6300 J), and 1363.6 (group C, 7560 J) mW/cm(2). The right (N) ears served as controls. The safety of PBM was determined by endoscopic findings, auditory brainstem response (ABR) thresholds, and histological images of hair cells using confocal microscopy, and light microscopic images of the external auditory canal (EAC) and tympanic membrane (TM). Endoscopic findings revealed severe inflammation in the TM of C group; no other group showed damage in the TM. No significant difference in ABR threshold was found in the PBM-treated groups (excluding the group with TM damage). Confocal microscopy showed no histological difference between the AL and AN, or BL and BN groups. However, light microscopy showed more prominent edema, inflammation, and vascular congestion in the TM of BL ears. This study found a dose-response relationship between laser power parameters and TM changes. These results will be useful for defining future allowance criteria for trans-tympanic laser therapies.</P>
Electron Cyclotron Resonance O_2 Plasma에서 증착한 규소 산화 박막의 특성
안명환,서문석,장재선,서성모,이기방,윤창주,이형재,남기석,최규현,손춘배,김용섭,강석희 全北大學校 基礎科學硏究所 1994 基礎科學 Vol.17 No.-
규소 산화막을 ECR-CVD(electron cyclotron resonance-chemical vapor deposition) 증착방법으로 5인치 기판위에 상온에서 증착하고, 증착공정조건인 증착율, 기판온도, 마이크로파의 세기변화 및 플라즈마 혼합기체의 비에 따른 규소 산화막의 특성을 조사하였다. 또한 산화막의 구조적인 특성을 비교하기 위해 FTIR을 이용하여 ECR-CVD 증착한 산화막, RPE-CVD(remote plasma enhanced-CVD) 증착한 산화막 및 열 산화막의 stretching frequency를 측정하였다. 측정된 결과 ECR-CVD로 증착된 산화막이 구조적인 면에서 열 산화막과 거의 같음을 보였다. ECR-CVD로 증착된 산화막의 전기적인 특성을 전류-전압 및 축전-전압 측정에의하여 분석하였다. 축전된 산화막의 전기적인 특성은 산화막의 전하 밀도는 1×10 exp (11)/㎠이였고, 평균 절연 파괴 전압은 약 6 MV/㎝이다. We have grown thin films of SiO_2 at room temperature by using an ECR-CVD system and have investigated the changes in the properties of the deposited films with changes in the processing conditions such as the deposition rate, the substrate temperature, the microwave power and the plasma gas mixing ratio. We also measured the stretching frequency of three kinds of oxides, and ECR-CVD-grown oxide, a PECVD-grown oxide, and a thermally grown oxide, using FTIR analysis to compare their structural properties. The result shows that the structural properties of the ECR-grown oxide are similar to those of the thermally grown oxide. Additionally, the electrical properties of the ECR-grown oxide were investigated by using current-voltage and capacitance-voltage measurements. These electrical results indicate that the oxide charge density and the average breakdown voltage are 1×10 exp (11) ㎝^-2 and 6 MV/㎝, respectively.
The Effect of Coolant Boiling on the Molten Metal Pool Heat Transfer with Local Solidification
Cho, Jea-Seon,Kune Y. Suh,Chung, Chang-Hyun,Park, Rae-Joon,Kim, Sang-Baik Korean Nuclear Society 2000 Nuclear Engineering and Technology Vol.32 No.1
This study is concerned with the experimental test and numerical analysis of the heat transfer and solidification of the molten metal pool with overlying coolant with boiling. In the test, the metal pool is heated from the bottom surface and coolant is injected onto the molten metal pool. Experiments were performed by changing the test section bottom surface temperature of the metal layer and the coolant injection rate. The two-phase boiling coolant experimental results are compared against the dry test data without coolant or solidification of the molten metal pool, and against the crust formation experiment with subcooled coolant. Also, a numerical analysis is performed to check on the measured data. The numerical program is developed using the enthalpy method, the finite volume method and the SIMPLER algorithm. The experimental results of the heat transfer show general agreement with the calculated values. The present empirical test and numerical results of the heat transfer on the molten metal pool are apparently higher than those without coolant boiling. This is probably because this experiment was performed in concurrence of solidification in the molten metal pool and the rapid boiling of the coolant. The other experiments were performed without coolant boiling and the correlation was developed for the pure molten metal without phase change.
Sparganum mansoni의 腹腔 및 腹壁皮下寄生 各 1例
심명석,서동엽,장석효,김홍용,백인욱,이혁상,백낙환 인제대학교 1982 仁濟醫學 Vol.3 No.2
Clinical experience with a case of sparganosis in the abdominal wall, and another one in the abdominal cavity is reported. A living larva of the Sparganum mansoni was removed from the subcutaneous tissue of the abdominal wall of the 62 year-old female. Biopsy of a nodule from the serosal surface of the 22-year old male revealed a eosinophilic granulomatous lesion, which contained its dead larva.