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Ryu, Jungki,Lee, Sahng Ha,Nam, Dong Heon,Park, Chan Beum WILEY‐VCH Verlag 2011 Advanced Materials Vol.23 No.16
<P>A novel application of quantum‐dot QD sensitized TiO<SUB>2</SUB> nanotubes for artificial photosynthesis is presented by Chan Beum Park and co‐workers on p. 1883. The system is conceptually very close to natural photosynthesis; photo‐excited electrons are rapidly injected to nearby reaction centers upon light irradiation and generate reducing power, driving redox reactions for synthesis of organic compounds. This study demonstrates that more efficient artificial photosynthetic systems can be developed through rational design and engineering of photosystems. </P>
3차원 TLM법을 이용한 판상 역 F 안테나의 수치해석
박용국,김정기,김태원 延世大學校 電波通信共同硏究所 1996 電波通信論文誌 Vol.2 No.1
본 논문에서는 현재 사용되고 있는 소형 안테나중 광대역화를 도모하고 수직소자와 수평소자를 모두 갖추고 있어 전파의 편파특성이 일정하지 않는 지역의 이동통신에 적합한 안테나인 판상 역 F 안테나를 주파수 영역에서 해석하던 종래의 해석 방법과는 달리 디지탈 이동통신에 필요한 1GHz 주파수대에서 사용가능한 판상 역 F 안테나를 TLM(Transmission Line Matrix)법에 의한 시간 영역 해석으로 판상과 접지면에서의 전류분포와 공간에서의 필드분포의 시간에 따른 과도응답과 정상상태의 응답, 안테나의 공진 주파수 특성등을 해석하였다.
Ryu, Jungki,Lee, Sahng Ha,Nam, Dong Heon,Park, Chan Beum WILEY‐VCH Verlag 2011 Advanced Materials Vol.23 No.16
<P><B>Chiral compounds are successfully photosynthesized by coupling redox biocatalysis</B> with the photoregeneration of nicotinamide cofactors on quantum‐dot‐sensitized TiO<SUB>2</SUB> nanotubes under visible light irradiation. Nanotubular morphology and hybridization of TiO<SUB>2</SUB> with CdS enables highly efficient photoregeneration of cofactors by ensuring better diffusion of reaction species and rapid charge separation. </P>
이정기(Jungki Lee),박용성(Yongsung Park),정혁(Hyuk Jung),최승환(Seung-hwan Choi),김남용(Nam-yong Kim),김배수(Baesoo Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Currently there is a standard of fuel economy for heavy duty vehicle in korea MLTM. But this test method is static speed method(60㎞/h). Hybrid and Electric vehicle have special functions, which are regeneration brake system and dual energy sources to improve the fuel economy. So It is necessary to amend the vehicle safety standard on heavy duty fuel economy that apply the characters of Hybrid and Electric vehicle. I will research the speed pattern and distribution of idle, cruise and acceleration of national road and world wide test cycle, which ETC, HHDDT, JE05 and WHVC. and I will measure fuel economy of the combined road which are urban, rural and motorway In addition I will measure the fuel economy of the selected standard routes in seoul and busan. The test result of WHVC is a nearly average value of other test modes. The average speed between urban, rural and motorway in WHVC and combined road is similar. The fuel economy and distribution of speed and acceleration between urban in WHVC and the selected standard routes in Seoul and Busan are very similar. More research and test are needed to develop the new test mode of fuel economy for heavy duty vehicle.
Bone-like peptide/hydroxyapatite nanocomposites assembled with multi-level hierarchical structures
Ryu, Jungki,Ku, Sook Hee,Lee, Minah,Park, Chan Beum Royal Society of Chemistry 2011 SOFT MATTER Vol.7 No.16
<P>Inspired by nature's strategy for creating organic/inorganic hybrid composite materials, we developed a simple but powerful method to synthesize bone-like peptide/hydroxyapatite nanocomposites using a mussel-mimetic adhesive, polydopamine. We found that polydopamine was uniformly coated in a graphite-like layered structure on the surface of self-assembled diphenylalanine (Phe-Phe, FF) nanowires and enabled the epitaxial growth of <I>c</I>-axis-oriented hydroxyapatite nanocrystals along the nanowires, which is similar to mineralized collagen nanofibers of natural bone. The mineralized peptide nanowires were further organized in relation to each other and then readily hybridized with osteoblastic cells, resulting in the formation of multi-level hierarchical structures. They were found to be nontoxic and enabled efficient adhesion and proliferation of osteoblastic cells by guiding filopoidal extension.</P> <P>Graphic Abstract</P><P>Polydopamine-coated peptide nanowires are readily mineralized with <I>c</I>-axis-oriented carbonated hydroxyapatite nanocrystals and then hybridized with osteoblasts, forming multi-level hierarchical structures as observed in mineralized collagen of natural bone. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1sm05307h'> </P>