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서울의 Penicillinase Producing Neisseria gonorrhoeae 발생빈도(1998)
김재홍,김준호,반재용,이정우,황성주,정준규,정성태,강진문,조흔정,홍창의,정혜신,이한승,김이선,이봉길,이종호,선영우,한기덕,윤성필,이성훈,안종성,박석범,문승현,조항래,김형섭,류지호,황재영,박준홍,손상욱 한양대학교 의과대학 2001 한양의대 학술지 Vol.21 No.1
In recent years, gonorrhea has been pandemic and remains one of the most common STDs in the world, especially in developing countries. For the detection of a more effective therapeutic regimen and assessing the prevalence of Penicillinase Producing Neisseria gonorrhoeae(PPNG), we have been trying to study the patients who have visited the Venereal Disease Clinic of Choong-Ku Public Health Center in Seoul since 1980 by menas of the chromogenic cephalosporin method. In 1998, 93 strians of N. genorrhoeae were isolated, among which 60(64.5%) were PPNG. The prevalence of PPNG in Seoul, which had been decreased to 39% in 1996 after a peak of 74.3% in 1993, is increased to 64.5% in 1998.
안성훈,조명수,송재수,도진우,김종성,손인철 한국전통의학연구소 2002 한국전통의학지 Vol.12 No.1
This study was designed to investigate the location of Sin-Guel(CV_(8), 神闕) through literature research. We extracted the part about the location of Sin-Guel(CV_(8), 神闕) from ancient and modern oriental medical literature which were used commonly in clinic. The results were summarized as follows; 1. The location of Sin-Guel(CV_(8), 神闕) were generally recorded DangJeJung. 2. Sin-Guel(CV_(8), 神闕) placed in middle of linea alba. 3. Treatment effect of moxibustion on Sin-Guel(CV_(8), 神闕) were recorded as diarrhea, dropsy, prolapse of the anus, stomachache, paralysis etc.. 4. Acupuncture therapy on Sin-Guel(CV_(8), 神闕) is dangerous because of inflammation, it is suggested that acupuncture therapy may be possible if acupuncture therapy do not induce inflammation on Sin-Guel(CV_(8), 神闕).
Mixer-Settler를 이용한 연속공정에 의한 니켈과 코발트의 추출
안재우,안종관,이만승 대진대학교 첨단소재연구소 2001 첨단소재연구소논문집 Vol.4 No.-
Extraction behaviors of Co and Ni in hydrochloric acid solutions by Alamine336(Teritary amine) have been investigated in mixer-settler. The feeding aqueous solution contained 5.0g/L nickel and 0.7g/I, Co in 5.0M hydrochliric acid solution. The organic phase being used for extractant comprised 20 vol. % Alamine336(Teritary amine) in Xylene. The 10 mixer-settler units of count current type consist of 3 extraction, 2 scrubbing, 3 stripping and 2 washing sections. The extraction percent of Co was 99 % but Ni was not extracted during 3 steps. Ni co-extracted with co was removed in 2 steps of scrubbing section by 6M hydrochloric acid solution from organic phase. Over 92% of Co from organic phase was stripped by 0.1M hydrochloric acid solution in 2 volume ratio of organic and aqueous phase. After stripping, the organic phase that was washed by 3.0 M hydrochloric acid solution in 2 volume ratio of organic and aqueous phase could be recycled for the organic solution.
첨전법에 의한 FeCl₃ 용액으로부터 산화철(Fe₂O₃)제조 연구
안재우 대진대학교 첨단소재연구소 1998 첨단소재연구소논문집 Vol.1 No.-
The precipitation of Fe₂O₃ from ferric chloride solution was invesgated in autoclave experiments. The minimum temperature to form Fe₂O₃ in the absence of Fe₂O₃ seed is 125℃. But in the presence of Fe₂O₃ seed, Fe₂O₃ is precipitated at temperatures as low as 100℃. The amount of iron precipitated and the concentration of co-generated HCI increase as the initial concentration of ferric chloride increase from 0.025 to 0.3M Fe₂O₃. Futher increases in the FeCl₃ concentration have a negligible effect on the quantity of Fe₂O₃ precipitated or on the concentration of HCI generated. Increasing initial HCI concentrations, however, sharply reduce the amount of Fe₂O₃.
안종필,박주원,서재우 朝鮮大學校 建設技術硏究所 2007 建設技術硏究 Vol.27 No.2
Development of design method based on probability theory sublating discrepancy of definitive design standards in designing foundation structure is needed. This study develops uncertainties of resistance and load effect of foundation structures in order to introduce the concept of probabilistic design based on reliability into foundation structures, estimate reliability index suitable to foundation structures, compares and analyzes safety and durability performance and the results of research can be summarized as follows. Optimum safety radio of bearing power of pile foundation was estimated as 2.9613 according to interpretation of reliability and it was analyzed in a rational way compared to uniform safety ratio value based on conventional allowable stress design methods, and as a result of analyzing life cycle cost of foundation structures, it was confirmed that execution of maintenance and management strategy in repair and maintenance condition of safety evaluation grade B was most economical. In addition, prevention LCC/post LCC ratios of foundation structures for life cycle of 80 years were 60.54%, 54.58%, 52.27% and 49.29% at maintenance, repair, reinforcement and replacement respectively and prevention and maintenance strategy was more economical than post maintenance strategy. It is expected that the results of this study will be used as basic materials to build analysis techniques of reliability and economy of foundation structures through expansion of statistical data of foundation structures.
통계적 기법을 이용한 마이크로 스피커 다이아프램의 최적형상설계에 관한 연구
안찬우,홍도관,최재기,박진우 東亞大學校附設 生産技術硏究所 2007 生産技術硏究所硏究論文集 Vol.12 No.-
This study uses response surface methodology to explain correlations between the objective function and design variables, fractional factorial design and central composite design were carried out. The change of shape of diaphragm, thickness of diaphragm and voice coil weight based on fractional factorial design and central composite design are made. Therefore this study carried to decide design variables for minimizing 1st natural frequency and maximizing 2nd natural frequency of diaphragm using response surface methodology and screening(fractional factorial design), we showed improved design variables.
염산용액에서 Alamine336에 의한 니켈과 코발트의 분리
安鍾寬,安在禹,李晩承 대한금속재료학회 2002 대한금속·재료학회지 Vol.40 No.7
Solvent extraction experiments with Alamine336 from hydrochloric acid solutions containing cobalt and nickel have been performed to separate both metal ions. Cobalt was preferentially extracted from nickel by Alamine336 due to the difference betwen the complex formation constant of cobalt-chloro and nickel-chloro complex. The extraction percentage of cobalt and nickel were greatly affected by the concentration of chloride ion but were independent of solution pH when the chloride salt of Alamine336 was used as extractant. In the experimental ranges, the separation factor was increased with reaction temperature. The stripping percentage of cobalt decreased with the concentration of HCl in stripping solution.
Di-n-Hexyl Sulfide 함유 지지액막을 통한 팔라듐의 투과 특성
안재우,정진기,이재천 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.9
The transport of palladium through supported liquid membranes from hydrochloric acid solution has been investigated. Di-n-Hexyl Sulfide(DHS) has been stuided as a mobile carrier for the facilitated transport of Pd(Ⅱ) and kerosene as a diluent. Ammonium hydroxide solution has been employed as a stripping agents. The transport behavior of Pd(Ⅱ) was studied at various factors such as concentration of hydrochloric acid in feed solution, ammonium hydroxide in stripping solution, DHS in membrane phase, palladium in feed solution and the effect of stirring speed. The separation of palladium from palladium-platinum mixed solutions has also been investigated.
구리, 니켈 및 코발트를 함유한 염산용액으로부터 LIX84에 의한 구리의 용매추출
안종관,안재우,오영주,이만승 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.3
Solvent extraction experiments with LIX84 have been performed to separate copper from synthetic hydrochloric acid solutions containing copper, nickel and cobalt. Experimental conditions such as solution pH, the concentration of chloride ion and LIX84 and manganese ion, the volume ratio of organic to aqueous phase and pH of stripping solution have been investigated. The optimum conditions for the separation of copper from nickel and cobalt were obtained from the experimental results.
Nickel 및 Cobalt가 함유된 염산용액중에서 Alamine336에 의한 Fe, Mn 및 Zn의 분리
안재우,안종관,박경호,손정수 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.6
The separation and recovery of cobalt and nickel from hydrochloric leaching solutions of manganese nodules were imitated by solvent extraction using Alamine336 in Xylene. The behavior of impurities such as iron, zinc, copper and manganese was also investigated. With the increase of chloride ion concentration, cobalt was selectively extracted from nickel owing to the difference of chlorocomplex in solution and the minimum chloride ion was 5.0M. But in this extraction step, the impurity metals such as copper, iron, manganese, zinc were also co extracted in the organic phase. However, co-extracted metals in the organic phase could be effectively separated in the scrubbing and stripping step. Manganese and nickel were effectively removed in the scrubbing step with 6.0M hydrochloric solutions but copper, iron and zinc were loaded in the organic phase with cobalt. Finally, the metal-bearing organic phase was contacted with the hydrochloric strip solution to recover the loaded cobalt. The impurity metals were effectively removed in this step with controlling the concentration of chloride ions in the strip solution. From the experiment, The behaviors of impurities on each of operation steps in extraction, scrubbing and stripping processes were investigated. Consequently the optimum condition for the separation of cobalt from hydrochloric solution were proposed.