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Pohang, South Korea

Jeong Y.J.,Daegu Gyeongbuk Institute of Science and Technology | Woo S.,Daegu Gyeongbuk Institute of Science and Technology | Woo S.,Kyungpook National University | Kim Y.,Kyungpook National University | And 6 more authors.
Molecular Crystals and Liquid Crystals | Year: 2011

We report an experimental optimization of the cleaning process in the fabrication of flexible polymer solar cells using an indium tin oxide (ITO) coated poly(ethylene naphthalate) (PEN) substrate. The effects of the solubility parameters of the cleaning solvents on the occurrence of ITO cracks have been systematically investigated. The experimental results showed that the ITO cracks caused during the ultrasonic cleaning process were mainly affected by differences between the solubility parameters of the solvent and that of the PEN substrate, not by direct interaction between the solvent and the ITO layer. Our results provide a simple method for reducing ITO cracks during wet cleaning processes by selecting solvents with solubility parameters which differ significantly from those of the flexible substrates. © 2011 Taylor & Francis Group, LLC. Source

Lee Y.,Kyungwoon University | Kim T.,Kyungwoon University | Lee S.,GERI | Shim J.,Andong National University
International Journal of Multimedia and Ubiquitous Engineering | Year: 2015

Recent research has been devoted and focused on detecting pedestrians and vehicles in intelligent vehicles except for vulnerable road users (VRUs). Histogram of Oriented Gradients (HOGs) descriptor is one of the state-of-art methods which have been shown to significantly outperform the existing feature set for several objects detection. In this paper we present a method for two-wheelers detection based on the periodicity of the size of spatial regions; cells and blocks. Contrary to concatenating feature vectors using a dense grid of HOG, proposed algorithm storage extracted feature vectors according to the period in each step. Experimental results show that the new approach gives higher detection accuracy than that of the conventional method. © 2015 SERSC. Source

Son S.,GERI | Nishida S.-I.,Saga University | Lee J.-H.,GERI | Kim Y.-T.,GERI | And 3 more authors.
Transactions of the Korean Society of Mechanical Engineers, A | Year: 2010

The objective of this study is the estimation of the mechanical properties of HIP-treated MMCs by an optimized manufacturing process. The Ti-MMCs were fabricated by HIP and rotary swaging (RS) for secondary processing. The Ti-MMCs with different tungsten fiber contents of 0, 6, 9, and 12 vol% were subjected to tensile tests, fatigue tests, and hardness tests. The results show that the hardness values of Ti-MMCs increased with the increasing volume percent of tungsten fibers, the tensile strength increased by approximately 50% (specific strength: 38%) at the 9 vol%. The value of tungsten-fiber orientation F affects the tensile strength. The fatigue strengths of the Ti-MMCs did not improve. HIP is a useful manufacturing method for Ti-MMCs and RS is an important process for improving fiber orientation during secondary processing. Source

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