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이삼노,조재연,박진형 國立 麗水大學校 環境問題硏究所 2000 環境硏究論文集 Vol.3 No.-
Studying the physical characteristics of flow on the various tidal conditions around the Kangjin Bay, harmonic analysis and tidal currents observations were carried out. Tidal currents observations were carried out around Kangjin Bay, southern coast of Korea in July. 25-26. 2000 during neap tide and July. 31-August. 1.2000 during spring tide. The maximum tide difference is 440㎝ during spring tide at Kangjin Bay and 195㎝ during neap tide. The averaged current speed rang was from 49.54㎝/s to 23.25㎝/s at ST.C1. and from 40.49㎝ to 16.01㎝ at ST.C2 during spring tide and when the neap tide. from 49.54㎝/s to 23.25㎝/s at ST.C1. and from 40.49㎝ to 16.01㎝ at ST.C2. Therefore the direction of residual current is northward inner bay of Kangjin Bay and southward residual current is excellent in Kangjin Bay. Tracks of drogues show that drogues are moved from Station A to the northward thorough the right side of Birae-Do in flood flow and from Station C to the southward in ebb tide. These phenomenon were due to results of the characteristic of tidal flow and coastal topography.
Sam Yeon Cho,Jin Woo Kim,Sang Don Bu 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.9
In this study, porous anodic alumina (PAA) was fabricated using oxalic acid and phosphoric acid as electrolytes, and the effects of impurities on the phase transition of PAA according to changes in the heat-treatment temperature were investigated. The average pore diameter of PAA fabricated using oxalic acid and phosphoric acid increased from 43 nm to 64 nm and from 145 nm to 183 nm, respectively, in proportion to the increase in the heat-treatment temperature. An X-ray diffraction (XRD) structure analysis revealed the structure of PAA fabricated in oxalic acid to be amorphous at or below 800 ◦ C and it changed to γ-alumina at 850 ◦ C. At higher temperatures, as the heattreatment temperature was increased, a coexistence of γ- and δ-alumina phases was observed in the 900 − 1000 ◦ C range, and the existence of δ-alumina was observed only at 1050 ◦ C. Finally, at 1100 ◦ C, a coexistence of δ- and α-alumina phases was observed. On the other hand, for PAA fabricated in phosphoric acid, while an amorphous structure appeared at or below 800 ◦ C, as was the case with PAA fabricated in oxalic acid, only δ-alumina existed in the 850 − 1100 ◦ C range. On the basis of 27Al magic-angle-spinning nuclear magnetic resonance (MAS NMR) and Fourier transform infrared spectrometry (FT-IR) results, we concluded that such a discrepancy in the phase transition was attributable to interactions between impurities originating from the electrolytes.
Cho, Seung-Yeon,Kim, Young-Kuk,Chung, Yong-Sam Korean Nuclear Society 1992 Nuclear Engineering and Technology Vol.24 No.2
Nondestructive neutron activation analysis of copper in high purity Aluminum samples which can be used as a parameter of impurity is investigated and determined. Other 23 trace impurity elements in the samples are also determined. In the analysis of copper, the new irradiation method using thermal column was applied to reduce the interfering activity of 24Na produced by 27Al(n,$\alpha$)24Na reaction induced by fast neutron. As a result, the interference can be reduced to 100 times more than other activation methods. Also the influence by activity of 24Na is found in the range of 2~3 %. It has been observed that the copper contents in so-ratted“six nine”class standard aluminum samples are about 0.54 $\pm$ 0.08 ppm. By the comparison with other values re-ported, our results are reasonable and can be available as a improved routine analysis.
99m Tc-tin colloid 를 이용한 간 스캔상 " Hot spot " 로 나타난 상대정맥증후군 1예
조보연,이명철,고창순,조경삼,김병태,신영태,권기익 대한핵의학회 1981 핵의학 분자영상 Vol.15 No.1
The hot spot on liver scan was demonstrated by many authors in various conditions such as SVC obstruction, Budd-Chiari syndrome, liver abscess, hemangioma of liver, hepatic venoocclusive diseases, IVC obstruction, and tricuspid insufficiency. And the appearance of hot spot in SVC obstruction is due to unsual collateral circulation. But there was no report of this hots pov t on liver scan in our country. We have recently observed one patient with SVC obstruction who shows well-defined area of increased radioactivity between right and left lobe of liver on liver scan using 99mTc-tin colloid, and demonstrated collateral circulations with RI venograghy using 99mTc-O4. The injection site of radiocolloid was left antecubital vein. This hot spot did not appear when the radiocolloid was injected into right leg vein. We report here this hoe spot on liver scan in SVC obstruction with review of some literactures.
APPLICATION OF EXTENDED LUENBERGER OBSERVER FOR INDUCTION MOTOR CONTROL
Sam-Yong Jeong,Youn-Ok Choi,Kang-Yeon Lee,Geum-Bae Cho,Hyung-Lae Baek 전력전자학회 1998 ICPE(ISPE)논문집 Vol.- No.-
In this paper, authors introduce an application of a nonlinear rotor flux observer, known under the name of ELOXextended Luenberger Observer), for direct rotor field oriented control(DRFOC) of induction motor ELO requires no solution of nonlinear partial differential equation for its coordinate transformation and linearization used for the nonlinear observer desiga Its simulation results concerned to different level of unknown variables of load torque and rotor resistance show high accuracy on rotor flux estimation in steady state.<br/>