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Daejeon, South Korea

Daeduk College is a private technical college in the Yuseong-gu district of Daejeon, a major city of South Korea. The current president is Han Sung-dong . The college employs about 100 instructors. Wikipedia.

Lee K.W.,Korea Technology Finance Corporation | Lim J.M.,Daeduk College
International Journal of Automotive Technology

From MY2010 US-NCAP, the 5th percentile female Hybrid III dummy has been used for the safety evaluation of the right front passenger position in the frontal impact test. In Korea, the Ministry of Land, Infrastructure and Transport (MLIT) decided to evaluate the safety of the 5th percentile female dummy in the frontal impact test from 2013 KNCAP. In this paper, using the frontal NCAP data for the 5 vehicles available from the NHTSA test database, the safety of the 5th percentile female dummy were examined. Using the evaluation and rating method by the KNCAP, 5 vehicles received 5 stars. Using the evaluation and rating method by the US-NCAP, only one vehicle received 5 stars and the remaining 4 vehicles received 4 stars. In the US-NCAP, the Nij was the most influential factor for the star rating. In the KNCAP, the evaluation and rating method for the 5th percentile female Hybrid III dummy is less stringent than the method of the US-NCAP. The evaluation and rating method is proposed to increase the stringency of the star rating for the female dummy in the KNCAP. © 2014, The Korean Society of Automotive Engineers and Springer-Verlag Berlin Heidelberg. Source

Ambade S.B.,Chonbuk National University | Ambade R.B.,Chonbuk National University | Lee W.,Daeduk College | Yoon S.C.,Korea Research Institute of Chemical Technology | Lee S.-H.,Chonbuk National University

This work reports on inverted polymer solar cells (IPSCs) based on highly transparent (>95%), hydrophobic, seedless ZnO nanorods (NRs) as cathode buffers with extremely enhanced electrical characteristics. The transparent NR suspension with stability for more than a year is achieved by adding a small amount of 2-(2-methoxyethoxy) acetic acid (MEA). The ability of the stable nanorod suspension to easily spin-coat is certainly an advance to the fabrication of films over large areas and to replace the conventional seeding method to grow one-dimensional nanostructures for use in optoelectronic devices. We observe a strong correlation between the photovoltaic performance and the transparency of ZnO NRs. IPSCs using poly-3-hexylthiophene (P3HT) and [6,6]-phenyl C60 butyric acid methyl ester (PCBM) mixtures in the active layer and transparent (MEA-capped) ZnO NRs as cathode buffers exhibit a power conversion efficiency of 3.24% under simulated AM 1.5G, 100 mW cm-2 illumination. © 2014 the Partner Organisations 2014. Source

In this study, the characterizations of oxide contact hole etching are investigated with C4F8/O2/Ar and CH2F2/C4F8/O2/ Ar plasma. As the percent composition of C4F8 in a C4F8/O2/Ar mixture increases, the amount of polymer deposited on the etched surface also increases because the CxFy polymer layer retards the reaction of oxygen atoms with PR. Adding CH2F2 into the C4F8/O2/Ar plasma increases the etch rate of the oxide and the selectivity of oxide to PR. The profile of contact holes was close to 90°, and no visible residue was seen in the SEM image at a C4F8/(C4F8+O2) ratio of 58%. The changes of chemical composition in the chamber were analyzed using optical emission spectroscopy, and the chemical reaction on the etched surface was investigated using X-ray photoelectron spectroscopy © 2015 KIEEME. All rights reserved. Source

Lee D.Y.,Hanyang University | Lim I.,Hanyang University | Shin C.Y.,Hanyang University | Patil S.A.,Hanyang University | And 4 more authors.
Journal of Materials Chemistry A

Efficient separation of charges and their mobility are key challenges in metal-organic-framework (MOF) based devices. In the present study, thin films of cobalt-based metal organic frameworks (MOFs) are synthesized using a layer-by-layer technique, and their electrical/optoelectronic properties are studied. The as-prepared MOF films show electrically insulating behavior, which after hole doping demonstrate p-type conduction behaviour. The measured HOMO-LUMO energy states of the MOF films are found to be well matched for sensitizing TiO2, and the photoluminescence quenching experiment demonstrates a facile photoelectron transfer path from the doped frameworks to TiO2. Consequently, the doped MOFs are employed successfully as light harvesting and charge transporting active layers in a fully devised TiO2-based solar cell. Two different organic ligands viz., benzene dicarboxylic acid and naphthalenedicarboxylic acid are used to synthesize two kinds of Co-MOFs having different geometrical dimensions of unit cells and pores, and their influence on hole doping and charge transportation is studied. Under optimized conditions, the Co-MOF based device demonstrates a solar-to-electric energy conversion efficiency of 1.12% with a short circuit current of 2.56 mA cm-2, showing promising future prospects of the application of Co-MOFs in photovoltaic devices. Further, the photovoltaic performance of the Co-MOF based device is comparatively studied with that of the previously reported Cu-MOF and Ru-MOF based similar devices, and the influence of different metal centers of MOFs on their light harvesting performance is discussed. © 2015 The Royal Society of Chemistry. Source

Jeong B.-W.,Daeduk College | Kim H.-Y.,Chungbuk National University
Physica E: Low-Dimensional Systems and Nanostructures

This work examines the torsional mechanical properties of single-walled carbon nanotubes with tensile pre-strains using classical molecular dynamics simulations. In particular, it is investigated how much the tensile pre-strains enhance the torsional stability of nanotubes, and how this enhanced torsional stability is dependent on the chirality of nanotubes. The observations reveal that the tensile pre-strains greatly enhance the torsional stability of nanotubes and the effects are strongly dependent on the degrees of tensile pre-strains and the chirality of nanotubes. The increase rates of torsional buckling moments are in proportion to the degrees of tensile pre-strains and much larger in zigzag nanotubes than in armchair nanotubes. In the case of zigzag nanotubes, the maximum increase rate of torsional buckling moment is 122.3% for the tensile pre-strain of 0.115. In addition, the tensile pre-strains also alter the torsional stiffness of nanotubes depending on the degrees of tensile pre-strains and the chirality of nanotubes. © 2014 Elsevier B.V. All rights reserved. Source

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