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Adhesion Properties of Transparent DLC Films on Polymer Substrates
Chiaki Terashima,Sang-min Baek,Tatsuru Shirafuji,Nagahiro Saito,Osamu Takai 한국표면공학회 2010 한국표면공학회 학술발표회 초록집 Vol.2010 No.11
Transparent diamond-like carbon thin films were synthesized by doping of silicon-oxide using pulse-biased inductively coupled plasma chemical vapor deposition. Optical properties, mechanical properties, and adhesion properties of these films on polymer substrates such as polycarbonate were investigated on the effects of the gas composition and plasma pre-treatment. Silicon-oxide incorporated diamond-like carbon films on polycarbonate had favorable properties of higher deposition rate and wider optical band gap, although too much oxygen incorporation (O/C ratio > 0.15) brought about poor adhesion strength.
GENERATION AND CHARACTERIZATION OF NANO SPRAY USING EHD NOZZLE
Koji TERASHIMA,Wamadeva BALACHANDRAN 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.10
The aim of this research is to generate and characterize nano-spray by conejet type ElectroHydro Dynamic atomization. Sprays produced by various nozzle types were observed under different operating conditions. Although it is relatively easy to produce very fine jet and drops with using insulating liquid such as Con oil, Ethanol etc., compared to conducting liquid like water, de-ionized-water is used as sample liquid in this research because it is too small to characterize insulating liquid spray. This is mainly because of the difference of conductivity and hence difference of charge relaxation tim e. It is possible to make steady con며et water spray, however, stable conejet atomization condition was very small. Compared to stable conejet atomization condition, quasi-stable conejet like atomization condition was large. In this case, the tip of the jet vibrates at very high speed causing the water jet breaks up, thus a mixture of very large as well as fine drops was produced during the short period of atomization. This problem could be minimized and even overcome by optimizing the size and the design of the nozzle. In quasi-steady condition, the jet diameter close to the breakup point was estimated to be less than 1㎛. In this condition, the drops generated are estimated to be in the submicron range.
Study on Effectiveness of Active Safety Devices on Low Friction Road Using Driving Simulator
Yoshimichi Terashima,Yuya Ishizaki,Ryuzo Hayashi,Pongsathorn Raksincharoensak,Masao Nagai 한국자동차공학회 2008 한국자동차공학회 Symposium Vol.2008 No.9
In recent years, various active safety devices have been developed for the prevention of accidents such as rear-end collision and skidding. The representative device for the collision prevention is the forward collision warning system, and the one for the stability control is the direct yaw-moment control (DYC) system using distributed braking forces. In this study, we aim to evaluate the performance of these devices by experiments using driving simulator reconducting critical and dangerous driving situations. Regarding the forward collision warning system, we propose a new algorithm of warning system adapted to road condition, and conduct experiments to verify its effectiveness with the driving simulator. The results of the experiment indicate that the proposed system is more effective than the conventional system. Regarding the DYC, we develop a DYC system for the driving simulator to verify the effectiveness of DYC on low friction road, including human driver in the closed-loop evaluation. The DYC algorithm is designed by model-matching control method. From the results of the experiment of obstacle avoidance, it reveals that the DYC system is very effective to stabilize the vehicle on low friction road.