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최상준,손종락,류삼곤 한국화학공학회 1989 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.27 No.2
Y형 제올라이트를 높은 온도에서 SiCl₄, 수증기 및 EDTA로 처리하여 일련의 탈알미늄화된 제올라이트를 만들었다. SiCl₄로 탈알미늄화된 제올라이트는 수증기나 EDTA로 탈알미늄화된 것에 비하여 결정의 파괴없이 완전하였다. 그리고 탈알미늄화 제법에 관계없이 0-(Si, Al)-0 신축진동에 의한 적외선 흡수 밴드는 단위 세포당의 골격구조의 Al 원자수가 감소함에 따라 높은 파수쪽으로 이동하였다. 높은 파수(3640㎝^(-1))에 있는 수산기 밴드는 골격구조의 Si/Al비가 약5까지는 Si/Al비가 증가함에 따라 거의 선형적으로 저파수쪽으로 이동하였으나 Si/Al비가 5이상에는 변하지 아니하였다. 탈알미늄화됨에 따라 제올라이트의 net 정전기적 하전의 감소 때문에 수분을 흡수하는 능력이 감소하였다. A series of dealuminated Y-type zeolites was prepared by treating zeolites with SiCl₄, steam, and EDTA at elevated temperatures. Y-type zeolites can be dealuminated by reaction with SiCl₄ without collapse of the crystal structure as compared with the treatment of steam and EDTA. Regardless of preparation method, the infrared absorption bands in frequency of the stretching O-(Si, Al)-O vibrations shifted in a linear manner as number of framework Al atoms per unit cell. The high-frequency hydrouy band (3640 ㎝^(-1)) decreased in wavenumber almost linearly with an increasing Si/Al ratio of the zeolite, but beyond a ratio close to 5, the frequency remained virtually unchanged. Upon dealumination the ability of the zeolite to absorb water decreased due to the decrease of net electrostatic charge.
The Effect of Oxide Layer Vacancies on Switching Behavior in Oxide Resistive Devices
최상준,김기홍,Woo-young Yang,Hyung-IK Lee,조수행 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.1
A high on/off ratio in oxide resistive devices is preferable for use in memory storage, especially when multibit operations are possible. Here, we demonstrate the effect of vacancy density on resistance by using three different Pt-copper oxide-W devices with different vacancy densities in the oxide layer. We show that a higher vacancy density in the oxide layer can enhance the on/off resistance ratio and demonstrate the advantage of this ratio in the realization of multi-bit operation. Finally, we successfully explain the impact of the vacancy density in the oxide layer using a simple model.
최상준 경북대학교 환경과학연구소 1987 環境科學硏究所論文集 Vol.1 No.1
Experimental investigations on the removal of Cu ( II ) from aqueous solution were carried out through two foam separation techniques ; foam fractionation and precipitate flotation. Efficient removal of Cu ( II ) could be obtained by precipitate flotation due to precipitation greater than by foam fractionation. Foreign ions inhibited the separation efficiency. The extent of inhibition by the divalent ions Caz+ and S0;- was found more serious than that by the monovalentions Na+ and NO3.
최상준,최준식,신상철,이원재 대한약학회 2011 Archives of Pharmacal Research Vol.34 No.2
The purpose of this study was to investigate the effect of oral myricetin on the bioavailability and pharmacokinetics of orally and intravenously administered doxorubicin (DOX) in rats for oral delivery. The effect of myricetin on the P-glycoprotein (P-gp) and CYP3A4 activity was also evaluated. Myricetin inhibited CYP3A4 enzyme activity with 50% inhibition concentration of 7.8 μM. In addition, myricetin significantly enhanced the cellular accumulation of rhodamine 123 in MCF-7/ADR cells overexpressing P-gp. The pharmacokinetic parameters of DOX were determined in rats after oral (40 mg/kg) or intravenous (10 mg/kg) administration of DOX to rats in the presence and absence of myricetin (0.4, 2 or 10 mg/kg). Compared to the control group, myricetin significantly (p < 0.05, 2 mg/kg; p < 0.01, 10 mg/kg) increased the area under the plasma concentration-time curve (AUC, 51-117% greater) of oral DOX. Myricetin also significantly (p < 0.05, 2 mg/kg; p < 0.01, 10 mg/kg) increased the peak plasma concentration of DOX. Consequently, the absolute bioavailability of DOX was increased by myricetin compared to that in the control group, and the relative bioavailability of oral DOX was increased by 1.51- to 2.17-fold. The intravenous pharmacokinetics of DOX were not affected by the concurrent use of myricetin in contrast to the oral administration of DOX. Accordingly, the enhanced oral bioavailability in the presence of myricetin, while there was no significant change in the intravenous pharmacokinetics of DOX, could be mainly due to the increased intestinal absorption via P-gp inhibition by myricetin rather than to the reduced elimination of DOX. These results suggest that the increase in the oral bioavailability of DOX might be mainly attributed to enhanced absorption in the gastrointestinal tract via the inhibition of P-gp and to reduced first-pass metabolism of DOX due to inhibition of CYP3A in the small intestine and/or in the liver by myricetin.
최상준,정지연,임성국,임대성,고동희,박동욱,박윤경,김소연,정은교 한국산업보건학회 2019 한국산업보건학회지 Vol.29 No.3
Objectives: The goal of this study is to standardize industry, process, and job within work environment measurement information. Methods: We selected 180 work environment measurement reports on 30 industries from a database monitored from 2014 to 2016 by the Korea Industrial Health Association. Ten industrial hygienists, each with over five years of experience in measurement, conducted a primary standardization of 180 reports. Two professional industrial hygienists with more than 20 years of experience each reviewed and revised the results of the primary standardization. We also examined the validity on the usefulness of the standardized database by the two industrial hygienists. Results: The final standardization results were classified into eight major categories, 23 sub-major categories, 39 minor categories, 53 unit categories and 70 sub-unit categories in the Korean Standard Industrial Classification (KSIC) 10th revision. A total of 161 processes were standardized, and there were 148 processes with K2B codes. Standard job was coded into 13 job groups including operator, automobile maintenance, nurse, maintenance, manager, excavating machine operator, forklift driver, radiologist, clinical pathologist, signer, researcher, kitchen assistant, and concrete reinforcement ironworker. Conclusions: Although the standardized information in this study may be only a part of the total information, it can be useful for improvement of the K2B system. Additional research is needed for an ongoing clean-up of data in the K2B and re-calibration and reclassification of standard processes until the future national exposure monitoring system is fully established.
Shallow Water Blackout (Hypoxic Blackout)–Induced Drowning: An Autopsy Report of Two Cases
최상준,이상한,전요한,박지현,이종규,여남석 대한법의학회 2022 대한법의학회지 Vol.46 No.4
Shallow water blackout (SWB) is defined as loss of consciousness due to hypoxia during underwater swimming or breath-holding, usually in shallow waters. To date, no cases of SWB-induced drowning have been reported in the Republic of Korea. Here, we report two cases of SWB, followed by drowning, with autopsy findings. Two men, aged 20 (case 1) and 25 (case 2) years, suddenly lost their consciousness during underwater swimming and escape training, respectively. Postmortem examination revealed foamy fluid within trachea and bronchus, pulmonary edema, and sphenoid sinus fluid, which are commonly observed findings in drowning cases. None of the organs in either case showed pathologic alterations, except for hypoplastic coronary artery disease incidentally found in case 2. Pathologists should be aware of this distinct pathologic entity to avoid misdiagnosing the cause or manner of death.
Resistive Switching Property of Copper Sulfide and its Dependence on Electrode
최상준,W.-Y. Yang,K.-H. Kim,Y.-K Kyoung,J.-G. Chung,H.-J. Bae,J.-C. Park,Koung-Kook Kim,Sangbin Lee,조수행 대한금속·재료학회 2011 ELECTRONIC MATERIALS LETTERS Vol.7 No.4
We investigated the effect of the electrode on the resistive switching property of (Cu, Zn, Pt)-Cu_2S-W structures to clarify the role of metallic ions and electrodes in forming conductive paths in solid-electrolytes and also to improve the switching property. Notably, Zn-Cu_2S-W and Pt-Cu_2S-W structures that lack of oxidizable metal electrodes exhibited bipolar switching characteristics, and practically preferable switching properties with appropriately higher a turn-ON voltage and resistance were achieved for Zn-Cu_2S-W in comparison to Cu-Cu_2S-W with too low turn-ON voltage. In contrast, the degrading evolution of switching was observed in Pt-Cu_2S-W. A simplified but convincing model is also suggested and discussed to explain the observations.