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윤영훈(Young Hoon Yoon),조재득(Jae Deuk Jo),정용현(Yong Hyun Jung),유영환(Young Hwan You),강정호(Jeong Ho Kang),정건우(Gun Woo Jeong) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
A effect of Diesel Fuel Additive on the Performance of Diesel Particulate Filter were investigated in DI injection NA diesel engine. Also, Fuel born catalysts(Type A and Type B FBC) used in this study were Fe based fuel additive in diesel fuel. FBC dosage was fixed a experimental condition(600ppm, 1,200ppm). As the result, Loading time of Type A FBC was shorter than Type B FBC. Also, It is shown that the reaction was more quickly occurred 450℃ condition than 420℃. This difference in reaction rate can be reduced to inject higher concentrations of the fuel additive.
Non-Pilot-Aided Timing Offset Estimation for OFDM Systems with Frequency Diversity
Hyun Yang(양현),Young-Hwan You(유영환) 한국방송·미디어공학회 2006 한국방송공학회 학술발표대회 논문집 Vol.2006 No.-
This letter deals with non-pilot-aided symbol timing estimation methods in an orthogonal frequency division multiplexing (OFDM) system. To do this, OFDM system uses a frequency diversity scheme over two consecutive data symbols. Our approach can be viewed as an expansion of Schmidl's and Minn's correlation methods. Using the OFDM signal equipped with frequency diversity, however, symbol timing is accurately estimated without additional training symbol and a second-order diversity gain is achieved.