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Jungho Mun,Young Uk Jeong,Byung Cheol Lee,Hyuk Jin Cha,Ji Young Lee,Kitae Lee,Kwon-hae Yea,Pil Dong Ahn,Seong Hee Park,Yong Ho Cha,Yong Woo Lee 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.I
Terahertz (THz) pulses from solid targets, such as an aluminum (Al) and a strong polyester film (Mylar), irradiated by ultra-intense laser pulses were measured by using a liquid-helium-cooled Ge:Ga detector. The irradiating intensity of the Ti:Sapphire laser was more than 10$^{18}$ W/cm$^2$. The typical pulse energy and pulse duration on the target were 200 mJ and 30 fs, respectively. To prevent ultraviolet (UV), visible, and near-infrared (NIR) radiation from being measured by the detector, we used polyethylene (PE) plates and indium-tin-oxide (ITO) films as selective windows and mirrors for the THz radiation. The reflectivity of the ITO film for THz radiation is 10 times higher than that for visible and NIR radiations. The THz wave radiated from a laser-induced plasma has a linear component of the polarization, which may be explained by linear mode conversion from a laser wakefield. This intense and wide-band radiation is expected to be a useful source for various THz applications, as well as for real-time diagnostics for a plasma in which particles are accelerating.
Lee, Jungho,Go, Eun Min,Dharmapurikar, Satej,Xu, Jianqiu,Lee, Sang Myeon,Jeong, Mingyu,Lee, Kyu Cheol,Oh, Jiyeon,Cho, Yongjoon,Zhang, Chunfeng,Xiao, Min,Kwak, Sang Kyu,Yang, Changduk The Royal Society of Chemistry 2019 Journal of Materials Chemistry A Vol.7 No.31
<P>Donor-acceptor intermolecular interactions and/or arrangements are key factors determining the performance of organic solar cells (OSCs). Herein, two ITIC-based isomeric acceptors (<I>o</I>-F-ITIC and <I>m</I>-F-ITIC) with fluorine atoms at <I>ortho</I> and <I>meta</I> positions within the side chains were developed. The developed acceptors showed different interactions and/or arrangements with the donor counterpart (PBDB-T), which caused a significant variation in the power conversion efficiency (PCE) of OSCs. The PCE of the PBDB-T:<I>o</I>-F-ITIC device was 11.11% <I>versus</I> 8.90% of the PBDB-T:<I>m</I>-F-ITIC device. A detailed theoretical analysis of the intermolecular complexes formed between F-ITICs and PBDB-T allows a determination of how the two isomeric acceptors interact differently with PBDB-T. Relative to PBDB-T:<I>m</I>-F-ITIC with a preferential DCI-BDD complex, PBDB-T:<I>o</I>-F-ITIC showed a closer donor-acceptor interaction, with a tightly packed parallel-like DCI-BDT complex, resulting in larger interfacial areas. These behavioral characteristics explain in detail the experimental results obtained from the comparison of the two blend systems relating to electrical and morphological properties. Moreover, transient absorption spectroscopy of PBDB-T:<I>o</I>-F-ITIC revealed superior hole/electron transfer and separation processes, providing further evidence of the presence of beneficial intermolecular complexes. This study facilitates the understanding of the role of constitutional isomerism both in intermolecular interactions and in promoting the development of high-performance OSCs.</P>
토크컨버터 내 리액터 블레이드 널링부 형상 최적화에 대한 연구
이중호(Jungho Lee),이성은(Seongeun Lee),박동철(Dongchul Park),이동욱(Donguk Lee) 한국자동차공학회 2016 한국자동차공학회 학술대회 및 전시회 Vol.2016 No.11
The torque converter is a device to transfer fluid flow to forward the engine power to the auto transmission. The purpose of this research is to strengthen the design through the shape optimization of the reactor knurled portion. The reason is to reduce the abrasion and breakage of the torque converter inside the reactor caused by the rough operation mode in the auto transmission vehicle. We optimized the shape of the reactor knurled portion, and verified the optimized model through the analysis of thermal expansion by high temperature, strength and deformation amount by engine torque.
Lee, Dongki,Sin, Dong Hun,Kim, Sang Woo,Lee, Hansol,Byun, Hye Ryung,Mun, Jungho,Sung, Woong,Kang, Boseok,Kim, Dae Gun,Ko, Hyomin,Song, Sung Won,Jeong, Mun Seok,Rho, Junsuk,Cho, Kilwon American Chemical Society 2017 Macromolecules Vol.50 No.21
<P>We fabricated hybrid poly(3-hexylthiophene) nano fibers (P3HT NFs) with rigid backbone organization through the self-assembly of P3HT tethered to gold NPs (P3HT-Au NPs) in an azeotropic mixture of tetrahydrofuran and chloroform. We found that the rigidity of the P3HT chains derives from the tethering of the P3HT chains to the Au NPs and the control of the solubility of P3HT in the solvent. This unique nanostructure of hybrid P3HT NFs self-assembled in an azeotropic mixture exhibits significantly increased delocalization of singlet (S-1) excitons compared to those of pristine and hybrid P3HT NFs self assembled in a poor solvent for P3HT. This strategy for the self-assembly of P3HT-Au NPs that generate long-lived S1 excitons can also be applied to other crystalline conjugated polymers and NPs in various solvents and thus enables improvements in the efficiency of optoelectronic devices.</P>