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Freud, Sigmund 圓光大學校 醫科大學 神經精神科學敎室 1987 圓光精神醫學 Vol.3 No.4
여러분,-아시다시피, 우리가 우리의 지식과 능력이 완전하고, 결말지은 것으로 자랑한 적은 없읍니다. 우리가 그전에 그랬던것 처럼 지금도 우리의 이해가 불완전하다는 것을 인정하며, 새로운 것을 배우고 우리의 방법을 개선할 수 있게 변경할 채비가 되여있읍니다.
Freud, Sigmund 圓光大學校 醫科大學 神經精神科學敎室 1992 圓光精神醫學 Vol.8 No.1
여러분-, 제가 이제 여러분께 말씀드릴 것을 준비하는 동안 저는 저자신의 약간의 내적 어려움으로 몹시 고심하였습니다. 그것은 나에게 허용된 기간이 확실치 않다는 것을 느끼고 있다는 것입니다. 지난 15년간, 정신분석의 연구과정이 많이 변하였고 또 보다 성숙하였다는 점은 사실입니다마는 정신분석입문 분야는 별 변화나 보충이 없는게 남아있는 형편입니다. 그간의 강의들이 이제는 별 존재이유가 없지 않은가, 하는 우려가 저의 마음속을 떠나지 않습니다. 그간 저는 분석가들에게는 이야기 한적이 변변치 못하였고, 더욱이 어떤 새로운 사실이라고는 아무것도 이야기 못하였습니다마는 ; 여러분께는 실로 많은 설명을 드렸으나 여러분은 그것을 이해하려는 준비를 별로 안하였던바고 실로 여러분의 전공분야도 아니였었습니다. 따라서 저는 그것으로서 변명을 삼기로하고 각각의 강의는 각각의 다른 근거에서 그에 대한 옳음을 찾기에 노력하였음을 밝혀둡니다.
Freud, Sigmund 圓光大學校 醫科大學 神經精神科學敎室 1997 圓光精神醫學 Vol.13 No.1
꿈의 해석의 최종 판이 반복적으로 인쇄되고 있는 상황이어서, 다음의 소견들을 기존의 판을 변화시키거나 그에 첨가시키지 않고, 독립된 형태로 제시한다.
여준한,Wolfgang M. Sigmund 한양대학교 세라믹연구소 2015 Journal of Ceramic Processing Research Vol.16 No.1
Titanate nanotube powders with high specific surface area for hydrogen storage were synthesized by alkaline hydrothermal treatment of a TiO2 powder at 150 o C for 48 hrs. With controlling contents of H2O and Na+ in synthesized titanate powders, via ion-exchanging and drying processes, their hydrogen uptake characteristics were evaluated. The titanate nanotube powders showed an increase in the specific surface area with the decreases in Na+ content by the ion-exchanging process and in H2O content by drying processes, but in reverse an decrease in that with severe ion-exchanging or over-drying at high temperature. Their hydrogen uptake increased with decreasing H2O contents in the powders with appropriate Na+ content only under no changing in the particle shape. Therefore, the powders with controlled H2O and Na+ contents had high hydrogen uptake of 2.21 wt% at 90 atm due to proper support of Na+ for interlayer distance in multi-walled tube typed titanate particle.
Woan, Karran V.,Sigmund, Wolfgang M. American Chemical Society 2011 Langmuir Vol.27 No.9
<P>Force interactions of porous silica particles against mirror-polished stainless steel surfaces were quantified in the presence of various solvents to facilitate processing of ceramics with less reliance on organic aids which subsequently need to be burned off. The results were compared to and found to be in good agreement to idealized models of van der Waals force interactions. Significantly, van der Waals attractive forces between steel surfaces and silica surfaces were minimized through the use of tetrahydrofuran and enhanced using methanol. The solvent selections were further extended to settling behavior and were found to follow the general trends determined by Stokes law. The methods presented herein can be extended to other real-world systems.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/langd5/2011/langd5.2011.27.issue-9/la200157v/production/images/medium/la-2011-00157v_0005.gif'></P>
Structural and magnetic properties of Ni doped titanate nanotubes synthesized by hydrothermal method
여준한,Wolfgang M. Sigmund 한양대학교 세라믹연구소 2015 Journal of Ceramic Processing Research Vol.16 No.1
A new method, hydrothermal method, to synthesize Ni doped rutile TiO2 nanotube (TNT) powders is introduced. This method is more scalable than ones used before. Interestingly, our Ni doped TNTs’ structures show different characteristics and properties than ones fabricated by other methods. We report these resulting structural and magnetic properties here. Ni doped nanotubes contained H2Ti2O5H2O doped with trivalent Ni. The layered structures had six nm inner and ten nm outer diameters, aspect ratios of seven, and exhibited ferromagnetism at room temperature (undoped nanotubes were diamagnetic). Contrary to earlier versions of Ni doped TNTs, we found that trivalent Ni atoms substituted H+ in the nanotubes and thus interacted with titanate’s 3d electrons to produce ferromagnetic activity. This opens the possibility to achieve ferromagnetic activity in TNTs in a new way.
Role of the Surface Chemistry of Ceria Surfaces on Silicate Adsorption
Seo, Jihoon,Lee, Jung Woo,Moon, Jinok,Sigmund, Wolfgang,Paik, Ungyu American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.10
<P>Ceria nanoparticles (NPs) have been widely explored as a promising material in various fields. As synthesized under various physicochemical conditions, it exhibits the different surface chemistry. Here, the role of hydroxyl and nitrate group on ceria surface, formed under various physicochemical conditions, for the silicate adsorption was experimentally and theoretically investigated based on the adsorption isotherms and theoretical analyses using density functional theory (DFT) calculation. Experimental results acquired from adsorption isotherms with Freundlich model indicated that the nitrate group shows a much higher affinity with silicate than the hydroxyl groups. These phenomena were demonstrated through the theoretical approaches that exhibit the binding energy of the NO<SUB>3</SUB>–ceria (−4.383 eV) on the SiO<SUB>2</SUB> surface being much higher than that of the OH–ceria (−3.813 eV). In good agreement with the experimental and the theoretical results based on adsorption properties, the results of chemical mechanical planarization (CMP) also show that the nitrate groups significantly enhance the removal of SiO<SUB>2</SUB> than the hydroxyl groups. The results investigated in this study will provide researchers, studying the ceria NPs, with guidelines on the importance of exploring the surface chemistry of ceria.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-10/am500816y/production/images/medium/am-2014-00816y_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am500816y'>ACS Electronic Supporting Info</A></P>
Electrospun materials for energy harvesting, conversion, and storage: A review
Laudenslager, Michael J.,Scheffler, Raymond H.,Sigmund, Wolfgang M. De Gruyter 2010 Pure and Applied Chemistry Vol.82 No.11
<P>Long-length nanofibers are able to form porous networks with high surface-area-to-volume ratios, and decrease diffusion lengths. While there are numerous techniques to create nanostructures, electrospinning is the only technique that allows fabrication of nanofibers at long-length scales. These uniquely shaped fibers are applied to several energy-related devices. This review is an in-depth summary of the uses of electrospun fibers in dye-sensitized solar cells (DSSCs), batteries, capacitors, fuel cells, and hydrogen storage devices. Developments in electrospinning technologies to create novel fiber morphologies are also discussed.</P>