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Theoretical Study of PPZ Based Dye for Efficient Dye-Sensitized Solar Cell
Kwon, Dong Yeul,Lee, Geon Hyeong,Kim, Young Sik American Scientific Publishers 2016 Journal of nanoscience and nanotechnology Vol.16 No.8
<P>Four novel 5,10-diphenyl-5,10-dihydrophenazine (PPZ) based dye (dye1, dye2, dye3) were designed and their electronic and optical properties were investigated by using density functional theory and time-dependent density functional theory for panchromatic dye sensitizer. The PPZ and phenoxazine (POZ) are electron donor moieties and cyanoacetic acid is a known electron acceptor. Due to the different placement of acceptor in dye1 and dye2, the degrees of electron mobility, absorption spectrum and molar extinction coefficient were different from each dye. The absorption spectrum and molar extinction coefficient of dye2 was broader and higher than them of dye1. Comparing dye2 and dye3, the absorption spectrum and molar extinction coefficient of dye3 was broader and higher than that of dye2 because of the presence of POZ antenna.</P>
Kwon, Dong-Yeul,Kang, Ok Hwa,Choi, Jang-Gi,Lee, Young-Seob,Oh, Yoo-Chang,Chae, Hee-Sung,Lee, Go-Hoon,Park, Pil-Sang,Kim, Youn-Chul,Sohn, Dong Hwan,Park, Hyun,Lee, John Hwa INVERNI DELLA BEFFA 2007 Fitoterapia Vol.78 No.6
<P><B>Abstract</B></P><P>Methanol extract and its fractions (hexane, EtOAc, <I>n</I>-BuOH, and H<SUB>2</SUB>O) of <I>Dryopteris crassirhizoma</I> were investigated for antibacterial activity against methicillin-resistant <I>Staphylococcus aureus.</I> The hexane fraction showed a good antibacterial activity against all tested strains.</P>
Kwon, Gu Hyun,Kim, Kyung Tae,Kim, Dong Won,Choe, Jungho,Yun, Jung Yeul,Kim, Jong-Man Elsevier BV * North-Holland 2019 Applied Surface Science Vol.476 No.-
<P><B>Abstract</B></P> <P>Nickel-nanoparticle-attached aluminum (Ni/Al) particles are synthesized by plating Ni onto Al particles with the surface oxide partly removed. The microstructure of the synthesized Ni/Al particles resembles a child’s snowman, with an approximately 200 nm spherical Ni nanoparticle bonded onto the surface of an Al particle about 800 nm in size. Particularly, the surface oxide is rarely observed at the Ni/Al interfaces unlike uncoated surface of the Al powder. Due to these microstructural characteristics, it was clearly noted that a self-propagating high-temperature synthesis (SHS) reaction of the snowman-shaped Ni/Al (SNA) particles occurs more actively compared to that which occurs when simply mixing particles of Ni and Al in the temperature range of 720–900 K. The formation of intermetallic compounds of NiAl or NiAl<SUB>3</SUB> is confirmed in a comparison of XPS results after both samples were oxidized at 773 K. The exothermic enthalpy energy, 8,850 Jg<SUP>−1</SUP> of SNA particles represents 118% of the value of 7,580 Jg<SUP>−1</SUP> for the mixed particles. These results indicate that SNA particles are promising as advanced reactive materials when used in conjunction with an efficient SHS reaction.</P> <P><B>Highlight</B></P> <P> <UL> <LI> Snowman-shaped Ni/Al particles are synthesized by removing Al oxide and plating Ni. </LI> <LI> The Ni nanoparticle is only coated on the surface oxide removed region of Al surface. </LI> <LI> The SNA particle shows high exothermic enthalpy energy during thermal oxidation. </LI> <LI> The directly bonded Ni/Al interface produces a rapid and much intermetallic compounds. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
A User-Oriented Interactive Model for the Conceptual Design of Bulk Cargo Ships
Lee, Dong-Kon,Lee, Kyung-Ho,Han, Soon-Hung,Lee, Soon-Sub,Lee, Kyu-Yeul,Shin, Soo-Chol,Shin, Dong-Won,Lee, Jong-Chol,Kwon, Sung-Chil The Society of Naval Architects of Korea 1994 Selected papers of the society of naval architects Vol.2 No.1
This paper describes a design model for the conceptual design of ships. Existing design models have problems such that their operating mode of batch versions cannot reflect the design procedures in reality. Reliability of the results is low because the performance estimations are based mainly on empirical formulas. To improve the problems of existing design models, a new design model has been developed. The new model consists of an interactive user interface, a database of main engines, a database of particulars of existing ships, and ten modules for performance estimations. To develop such a user-oriented system, the concept of graphical user interface (GUI) is adopted.
대규모 전시장의 전력 및 냉수 사용량을 기반으로 한 하절기 에너지소비 특성
공동석(Kong Dong-Seok),고인석(Ko In-seok),전형준(Jeon Hyung-Jun),권한솔(Kwon Han-sol),곽노열(Kwak Ro-Yeul),허정호(Huh Jung-Ho) 한국건축친환경설비학회 2008 한국건축친환경설비학회 학술발표대회 논문집 Vol.- No.-
Exhibition facilities are known as an internal load dominated-type building, as compared to other buildings. For the energy efficiency improvement of the subject large commercial building complex, it is valuable to monitor and manage energy performance data through FMS or BAS. Large amount of hourly raw data sets of the entire cooling season were processed and analyzed for the research purpose. The study objective is to investigate correlations between energy consumptions and various field conditions including weather data. Non-energy related data such as leased floor area was identified as a good indicator for the load prediction. The results showed the acceptable load characteristics and expectable correlations between factors and implies the necessity of extra valuable data monitoring such as accurate occupancy and use information.
Lee, Geon Hyeong,Kwon, Dong Yeul,Kim, Young Sik American Scientific Publishers 2016 Journal of nanoscience and nanotechnology Vol.16 No.8
<P>In this study, we investigated the effect of heteroleptic dual electron acceptor in dual donor based dyes for the dye-sensitized solar cells (DSSCs). Dye1 and dye2 were designed with a cyanoacrylic acid and an indolinum carboxyl acid as electron acceptors on each side of a triphenylamine (TPA). These dyes were compared to the reference well-known dye with single electron acceptor (D5 and JYL-SQ6). The density functional theory (DFT) and time-dependent density functional theory (TD-DFT) calculations were used to estimate the photovoltaic properties of the dyes. For these dye sensitizers, heteroleptic dual electron acceptor, both cyanoacrylic and indolinum moieties, could be fully used for the photovoltaic properties of dye1 and dye2. Considering overall properties, it is expected that dye2 with dual electron acceptor and with energy antenna moiety would show highest performance of the dyes in conversion efficiency for DSSCs.</P>