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최형철,남기대,정노희 한국공업화학회 2003 공업화학 Vol.14 No.3
펄프섬유로부터 잉크입자를 효율적으로 제거하여 잉크함량이 적고 백색도가 높은 재생펄프용 탈묵제를 제조하였다 본 연구의 또 다른 목적은 고백색도에 필요한 여러 계면활성제의 적정조건을 찾고 재생펄프의 수율을 높이는 것이다. 본 연구에서 우리는 우수한 탈묵효과를 위해 스테아르산과 여러 유형의 계면활성제를 사용하였다. 그리고 탈묵효율에 미치는 여러 가지 고형 탈묵제의 효과를 알기 위하여 부상탈묵실험을 수행하였다. 그 결과 고백색도와 높은 수율을 얻을 수 있는 새로운 고형 탈묵제의 적절한 조합조성은 스테아르산 75%와 폴리옥시알킬렌알킬아릴에테르 6%를 혼합한 것이었다. 또한 탈묵효과를 폭넓게 적용하기 위해 기포력과 피 안정도, 분산능을 테스트하였다. 새로운 타입의 탈묵제는 폐지 탈묵시 우수한 분산능과 적당한 기포력과 안정성을 나타내었다. A new feinting agent for recycling of waste paper was produced. This agent efficiently removed ink particles from the pulp fiber and the resulting recycled pulp had a high brightness and a low content of residual ink. Efforts were made to find an optimum condition of various surfactants used for high brightness and yield of recycled pulp. In this study, stearic acid was used for various types of general surfactants for deinking. Flotation deinking experiments were conducted in order to examine the effect of various solid-type deinking agents. As a restult, an optimum combination of this new solid-type deinking agent, which resulted in high brightness and yield, was 75 wt% stearic acid mixed with 6wt% polyoxyalkylene alkyl aryl ester. This new type deinking agent had good dispersability, suitable foaming power and foam stability in deinking of waste paper.
Visible wavelength autocorrelation based on the two-photon absorption in a SiC photodiode
Noh, Young-Chul,Lee, Jai-Hyung,Chang, Joon-Sung,Lim, Yong-Sik,Park, Jong-Dae Optical Society of Korea 1999 Current Optics and Photonics Vol.3 No.1
The two-photon absorption of a SiC photodiode was utilized to obtain autocorrelation signals of the pulses from a mode-locked Rh6G dye laser. The autocorrelation signals were in good agreement with those obtained by a conventional autocorrelator using a second harmonic crystal and photomultiplier tube. The sensitivity of the autocorrelator with the SiC photodiode was about $4{\times}10^3 {(mW)}^2$ . From these results it was demonstrated that the SiC photodiode is suitable as a nonlinear device for an autocorrelation measurement in the visible range.
Noh, Kyung Tae,Cha, Gil Sun,Kim, Hyung Chul,Lee, Jae Hong,Ahn, Soon Cheol,Kim, Dae Kyong,Park, Yeong-Min 한국식품영양과학회 2014 Journal of medicinal food Vol.17 No.9
Ellagic acid (EA) is a well-known phytochemical that modulates various cellular processes. It is present in a variety of foods, including grapes, strawberries, and nuts. However, the influence of EA on immunological responses is not well defined. Here, we investigated the effects of EA on the lipopolysaccharide (LPS)-induced bone marrow-derived dendritic cells (BMDCs). EA was not cytotoxic to DCs. EA suppressed LPS-induced expression of costimulatory molecules (CD80 and CD86), but it did not suppress the expression of major histocompatibility complex (MHC) class I and MHC class II in BMDCs. In particular, EA blocked LPS-induced c-Jun N-terminal kinase (JNK) activation. LPS-mediated expression of proinflammatory cytokines (IL-12 and IFN-${\gamma}$) was diminished by EA. We also confirmed that levels of IL-12 and IFN-${\gamma}$ were not influenced by EA in the presence of a JNK inhibitor. Taken together, these data demonstrate that EA regulates the immune response through the modulation of LPS-induced DC maturation.
( Chul Min Choi ),( Yeoung Chin Yoon ),( Dae Hoon Hong ),( Karla S. Brammer ),( Kun Bae Noh ),( Young Oh ),( Seung Han Oh ),( Frank E. Talke ),( Sung Ho Jin ) 대한금속재료학회 ( 구 대한금속학회 ) 2010 재료마당 Vol.23 No.3
This paper reports on the extremely superhydrophobic behavior of supercritical CO2 processed silicon nanowires (SiNWs) with a contact angle in excess of ~177°. Vertically aligned silicon nanowires with 10 nm to 40 nm diameter and 1 mm to 3 mm in length were obtained by electroless etching (EE) technique. The as-fabricated SiNWs were superhydrophilic with no water droplet formation (zero contact angle), and were then completely transformed to an extreme superhydrophobic state when their nanoscale surface roughness is combined with trichlorosilane hydrophobic coating. The processed SiNW array was so hydrophobic that water droplets always bounced off the surface and did not allow contact angle measurements to be obtained unless the substrate was intentionally given a concave-curvature by vacuum suction. Utilization of a hydrophobically surface-treated micro-pipette syringe enabled the release of a water droplet onto this extremely superhydrophobic surface for contact angle measurement. To prevent severe nanowire agglomeration during the drying process of wet etched SiNWs, supercritical CO2 drying was utilized, which process significantly improved the nano configuration and enhanced hydrophobicity.
( Chul Min Choi ),( Dae Hoon Hong ),( Young Oh ),( Kun Bae Noh ),( Jin Yeol Kim ),( Leon Chen ),( Sy Hwang Liou ),( Sung Ho Jin ) 대한금속재료학회 ( 구 대한금속학회 ) 2010 ELECTRONIC MATERIALS LETTERS Vol.6 No.3
The structure and properties of nanoscale magnetic island arrays for bit patterned media (BPM) have been studied. A periodic Si nano-island array was fabricated by nano-imprint-lithography (NIL), with the trench-filling and flattening achieved by resist spin coating followed by reactive ion back-etching. A Co/Pd multilayer magnetic media with a perpendicular anisotropy was then sputtered and lifted-off so that the processed nanostructure array now has the magnetic material only on the top of the pillars. This process significantly improved the magnetic characteristics of BPM. A planarization by hydrogen silsesquioxane filling reduced the tribological interference of the protruding nanoisland heights in BPM.