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공침법에 의한 BiDy₂Fe_(5)O_(12) 결정형 나노입자 분말의 제조 및 응용 연구
홍영대,조정환,김태엽,전성욱,홍영명 고신대학교 자연과학연구소 2007 고신대학교 자연과학연구소 논문집 Vol.14 No.-
금속산화물들은 각종 산업재료로서 유용하며 더욱이 그것들의 결정형 나노입자를 경제적으로 제조하는 기술은 21세기 첨단산업에 매우 중요하다. 저자들은 前報에서 화학합성법에 의한 각종 금속산화물의 나노입자를 제조하는 표준공정법을 연구하여 보고하였다. 본 연구에서는 그 표준공정법을 이용하여, 가넷의 일종인 BiDy_(2)Fe_(5)O_(12) 결정 나노입자 분말을 제조하고 그것의 자성체로의 응용을 위해 제품특성을 조사하었다. 가네트 제조과정에 필요한 침전물은 제품설계에 의거 몰비로 계산된 Bi, Dy, Fe의 질산염들의 혼합수용액에 침전제로서 pH NH_(3)-NH_(4)CI 완충용액 일정량을 가하여 얻어졌다. 이렇게 제조된 침전은 열처리과정을 거처 BiDy_(2)Fe_(5)O_(12) 결정형 나노입자 분말로 만들어졌다. 얻어진 제품의 입자크기, 조성, 결정구조 및 광자기성 등 특성시험이 SEM, ICP, XRD, 그리고 VSM 등을 사용하여 실시되었다. 각종 분석법을 사용하여 제품의 특성을 조사한 결과, 최초에 설계한 대로의 자성체가 나노 크기의 분말로 얻어졌으며 이것을 통하여 전보에서 확립한 표준공정법의 유효성도 입증되었다. Metallic oxides are useful as various industrial materials. Futhermore, the cost-effective techniques of fabricating the crystalline nanopartides of metallic oxides are very important for the high-tech industries of the 21 century, In the previous study, the authors reported the standard process for the preparation of crystalline nanoparticles of metallic oxides by chemical synthesis, In this study, BiDyzFesOiz nanoparticles were prepared by using the reported standard process and the characteristics of the product were investigated for applicability as magnetic substance. The precipitation needed for manufacturing process of garnet was made by adding the NH_(3)-NH_(4)CI buffer solution of pH 10 to the mixed solution of bismuth (III) nitrate, dysprosium(III) nitrate and iron(III) nitrate. The amount of each nitrate was calculated by the designed mole ratios. The nano-size crystalline powders of BiDy_(2)Fe_(5)O_(12) were earned by heating the precipitation at 800℃ for 4 hours in air. The characterizations, such as particle size, composition, crystal structure and magneto-optical property of garnet were tested by SEM, ICP, XRD, and VSM analyses. The results of the analyses showed the following two facts. First, a good magnetic substance of BiDy_(2)Fe_(5)O_(12) was earned as crystalline nano-size powders according to the original design. Next, the established standard process for the fabrication of METALLIC oxides nanonartieles was approved as a very effective method.
기판온도 및 박막두께가 Ga-doped ZnO 박막의 특성에 미치는 영향
조원준(Won Jun Cho),강성준(Seong Jun Kang),윤영섭(Yung Sup Yoon) 大韓電子工學會 2010 電子工學會論文誌-SD (Semiconductor and devices) Vol.47 No.1
본 연구에서는 RF 마그네트론 스퍼터링 법으로 Eagle 2000 유리 기판 위에 Ga-doped ZnO (GZO) 박막을 제작하여, 기판온도 100∼400 ℃ 및 박막두께에 따른 박막의 결정화 특성과 전기적 및 광학적 특성을 조사하였다. 공정조건에 상관없이 모든 GZO 박막은 c-축 배향성을 나타내는 (002) 회절 피크만이 관찰되었고, 300 ℃에서 400 ㎚ 증착한 GZO 박막이 가장 우수한 결정성을 나타내었으며, 그 때의 반가폭 값은 0.4°이었다. 또한, AFM 으로 박막의 표면형상을 분석한 결과 300 ℃에서 400 ㎚ 증착한 박막에서 비교적 입자가 고르고 치밀한 박막이 형성되었다. 전기적 특성은 홀 측정 결과 300 ℃에서 400 ㎚ 증착한 박막에서 가장 낮은 비저항 (8.01×10<SUP>-4</SUP> Ω㎝)과 가장 높은 전자 캐리어농도 (3.59×10<SUP>20</SUP> ㎝<SUP>-3</SUP>) 를 나타내었다. 모든 GZO 박막은 공정조건에 무관하게 가시광 영역에서 80 %의 투과율을 나타내었으며, 기판온도 및 박막두께 증가에 따른 Ga 도핑효과의 증가로 밴드 갭이 넓어지는 Burstein-Moss 효과가 관찰되었다. In this study, Ga-doped ZnO (GZO) thin films have been fabricated on Eagle 2000 glass substrates at various substrate temperatures 100∼400 ℃ and thin film thickness by RF magnetron sputtering in order to investigate the structural, electrical, and optical properties of the GZO thin films. It is observed that all the thin films exhibit c-axis orientation and a (002) diffraction peak only. The GZO thin films, which were deposited at T=300 ℃ and 400 ㎚, shows the highest (002) orientation, and the full width at half maximum (FWHM) of the (002) diffraction peak is 0.4°. AFM analysis shows that the formation of relatively smooth thin films are obtained. The lowest resistivity (8.01×10<SUP>-4</SUP> Ω㎝) and the highest carrier concentration (3.59×10<SUP>20</SUP> ㎝<SUP>-3</SUP>) are obtained in the GZO thin films deposited at T=300 ℃ and 400 ㎚. The optical transmittance in the visible region is approximately 80 %, regardless of process conditions. The optical band-gap shows the slight blue-shift with increase in doping which can be explained by the Burstein-Moss effect.
조준휘,김성환,박찬우,정해혁,한선숙,정재봉,배지훈,서정열,최영미,안희철,안무업,유기철,이강현 대한응급의학회 2003 대한응급의학회지 Vol.14 No.1
Frostbite is the most common local injury resulting from exposure to a cold environment. In the emergency department, the treatment of frostbite includes rewarming, prevention of infection, and wound management. However, systemic complications, such as rhabdomyolysis and acute renal failure, may develope in patients with wide and deep frostbite. We report a case of frostbite with acute renal failure which was successfully treated by early hemodialysis.
Pharmacokinetic and Bioequivalence Study of Zolpidem Tartate in Healthy Volunteers
( Jun Sung Park ),( Ja Hye Myung ),( Hun Sik Wang ),( Ja Seong Koo ),( Wonk Yung Cho ),( Hee Jun Park ),( Min Soo Kim ),( Jeong Soo Kim ),( Kwang Ho Cha ),( Sung Joo Hwang ) 한국약제학회 2011 Journal of Pharmaceutical Investigation Vol.41 No.3
In this study simple and sensitive high performance liquid chromatographic method using a commercially available column, was developed and validated for the determination of zolpidem tartrate in human plasma. The developed method with suitable validation was applied to a bioequivalence study of two different kinds of zolpidem tartrate. Two different formulations containing 10 mg of zolpidem tartate (CAS: 99294-93-6) were compared in 24 healthy male volunteers in order to compare the bioavailability and prove the bioequivalence. The study was performed in an open, single dose randomized, 2-sequence, cross-over design in 24 healthy male volunteers with a one-week washout period. Blood samples for pharmacokinetic profiling were drawn at selected times during 12 h. The mean AUC0-12h, Cmax, Tmax and T1/2 were 676.6±223.4 ng·h·mL-1, 177.4±34.2 ng·mL-1, and 0.8±0.4 and 3.5±2.1, respectively, for the test formulations, and 640.7±186.6 ng·h·mL-1, 193.0±64.5 ng·mL-1, and 0.9±0.4 and 2.7±0.9, respectively, for the reference formulation. Both primary target parameters AUC0-12h and Cmax were log-transformed and tested parametrically by analysis of variance (ANOVA). 90% confidence intervals of AUC0-12h and Cmax were in the range of acceptable limits of bioequivalence (80- 125%). Based on these results, the two formulations of zolpidem tartate are considered to be bioequivalent.
Jun, Eun Jung,Song, Ho-Young,Park, Jung-Hoon,Bae, Yoon Sung,Paulson, Bjorn,Lee, Sanghwa,Cho, Young Chul,Tsauo, Jiaywei,Kim, Min Tae,Kim, Kun Yung,Yang, Su-Geun,Kim, Jun Ki Elsevier 2018 JOURNAL OF VASCULAR AND INTERVENTIONAL RADIOLOGY Vol.29 No.12
<P><B>Abstract</B></P> <P><B>Purpose</B></P> <P>To evaluate the feasibility of self-expanding metal stent (SEMS) placement and fluorescence microendoscopic monitoring for determination of fibroblast cell proliferation after stent placement in an esophageal mouse model.</P> <P><B>Materials and Methods</B></P> <P>Twenty fibroblast-specific protein (FSP)-1 green fluorescent protein (GFP) transgenic mice were analyzed. Ten mice (Group A) underwent SEMS placement, and fluoroscopic and fluorescence microendoscopic images were obtained biweekly until 8 weeks thereafter. Ten healthy mice (Group B) were used for control esophageal values.</P> <P><B>Results</B></P> <P>SEMS placement was technically successful in all mice. The relative average number of fibroblast GFP cells and the intensities of GFP signals in Group A were significantly higher than in Group B after stent placement. The proliferative cellular response, including granulation tissue, epithelial layer, submucosal fibrosis, and connective tissue, was increased in Group A. FSP-1-positive cells were more prominent in Group A than in Group B.</P> <P><B>Conclusions</B></P> <P>SEMS placement was feasible and safe in an esophageal mouse model, and proliferative cellular response caused by fibroblast cell proliferation after stent placement was longitudinally monitored using a noninvasive fluorescence microendoscopic technique. The results have implications for the understanding of proliferative cellular response after stent placement in real-life patients and provide initial insights into new clinical therapeutic strategies for restenosis.</P>
Characteristics and outcomes of public bath-related out-of-hospital cardiac arrests in South Korea
Yung Jae Yoo,김기운,Choung Ah Lee,박용진,Kyoung Mi Lee,Jin-Seong Cho,Won Jung Jeong,Hyuk Joong Choi,Han Joo Choi,Nam Hun Heo,Hyung Jun Moon 대한응급의학회 2020 Clinical and Experimental Emergency Medicine Vol.7 No.3
Objective To analyze the differences in characteristics and outcomes between public bath (PB)-related and non-PB-related out-of-hospital cardiac arrest (OHCA) patients in South Korea. Methods We performed a retrospective observational analysis of collected data from the Smart Advanced Cardiac Life Support (SALS) registry between September 2015 and December 2018. We included adult OHCA patients (aged >18 years) with presumed OHCA of non-traumatic etiology who were attended by dispatched emergency medical services. SALS is a field advanced life support with smartphone-based direct medical direction. The primary outcome was the survival to discharge rate measured at the time of discharge. Results Of 38,995 cardiac arrest patients enrolled in the SALS registry, 11,889 were included in the final analysis. In total, 263 OHCAs occurred in PBs. Male sex and bystander cardiopulmonary resuscitation proportions appeared to be higher among PB patients than among non-PB patients. Percentages for shockable rhythm, witnessed rate, and number of underlying disease were lower in the PB group than in the non-PB group. Prehospital return of spontaneous circulation (11.4% vs. 19.5%, P=0.001), survival to discharge (2.3% vs. 9.9%, P<0.001), and favorable neurologic outcome (1.9% vs. 5.8%, P=0.007) in PB patients were significantly poorer than those in non-PB patients. Conclusion Patient characteristics and emergency medical services factors differed between PB and non-PB patients. All outcomes of PB-related OHCA were poorer than those of non-PB-related OHCA. Further treatment strategies should be developed to improve the outcomes of PB-related cardiac arrest.