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An Improved CWDM Demultiplexer based on Two-Mode-Interference Principle
Youngchul Chung,In-Sang Oh,Joon-Oh Park,Nam-Chun Heo 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.43 No.2
An improved design for a CWDM (coarse wavlength division multiplexing) demultiplexer based on the two-mode interference (TMI) principle is proposed, and the performance, such as crosstalk and insertion loss, is shown to be superior to that of a conventional demultiplexer. The temperature dependence of the transmission is very small, which makes the TMI demultiplexer suitable for CWDM applications.
A Nonlinear Transceiver Architecture for Overloaded Multiuser MIMO Interference Channels
Youngseok Oh,Heejung Yu,Lee, Y. H.,Youngchul Sung IEEE 2012 IEEE TRANSACTIONS ON COMMUNICATIONS Vol.60 No.4
<P>A new transceiver architecture for overloaded MIMO interference channels is proposed to fix the rate saturation problem of purely linear beamforming in this case. The proposed scheme is based on a mixture of linear beamforming and multi-user detection. It is shown that non-trivial degrees of freedom can be achieved by the proposed mixed scheme properly dividing the interference signals for linear processing and multiuser detection, and the achievable degrees of freedom of the proposed scheme are obtained. Numerical results show that the proposed scheme outperforms linear beamforming in overloaded MIMO interference channels.</P>
오풍(Poong Oh),윤영철(Youngchul Yoon) 한국언론학회 2006 한국언론학보 Vol.50 No.6
Audience fragmentation is being increasingly more intensified as broadcasters, in a attempt to have greater share of a specific type of audience market, produce highly specialized programs which only a certain type of audience likes. As a result, audience has lost chance to share the common experience of watching the same program with others. Since shared experience can promote social interactions among people, the lower level of shared experience due to audience fragmentation may weaken social relations and eventually erode social capital of a whole society. Moreover, highly fragmented audience market limits the scope of people with whom one can share experience to like-mined people with similar preference, reducing the chance of exposure to programs that represent different voices and opinions. In such a context, particular groups' opinions and perspectives are hardly mediated to the public through broadcasting, and thus they are less likely to be t be reflected upon policy decision processes. With this perspective in mind, this study examines to what extent each tele¬vision program can help create shared experience of viewing that leads to the accumulation of social capital among audiences. Especially, it proposes Social Capital Index(SCI), focusing on that each television program forms network of shared-experience among its viewers, and eventually, this shared experience might contribute to build social capital. And then its applicability was assessed by applying to 168 television programs actually broadcasted by South Korean broadcasting companies in 2003.
PHEV용 전동식 오일 펌프 용량 설계 기법에 대한 연구
오요셉(Joseph Oh),송민석(Minseok Song),김종현(Jonghyun Kim),김영철(Youngchul Kim),이재신(Jaesin Lee),김현수(Hyunsoo Kim) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
In this paper, a design method of an electric oil pump(EOP) capacity for plug-in hybrid vehicle is suggested. As a first step of design process, total flow rate model for hydraulic control system including spool valve leakage, solenoid valve leakage, seal ring leakage, lubrication, and mode change flow rate is constructed. Since the transmission fluid temperature influences on the flow consumption and power, the EOP capacity was designed by considering the total flow rate and power consumption. Also, pump speed limitation for preventing pump noise and vibration is applied to the design process. In addition, graphic user interface for the EOP capacity design is developed.
Song, Minseok,Oh, Joseph,Kim, Jonghyun,Kim, Youngchul,Yi, Jaeshin,Kim, Yeonho,Kim, Hyunsoo SAGE Publications 2014 Proceedings of the Institution of Mechanical Engin Vol.228 No.1
<P>In this paper, an electric oil pump control algorithm for an automatic-transmission-based hybrid electric vehicle was proposed. Dynamic models of the hybrid electric vehicle powertrain and hydraulic control system, including a mechanical oil pump and an electric oil pump, were obtained, and a hybrid electric vehicle performance simulator was developed. Also, a flow consumption model of the hydraulic control system was constructed. To represent the characteristics of the hydraulic control system according to the change in the temperature of the automatic transmission fluid, a viscosity index concept was introduced. Based on the simulation and test results, a viscosity index–line pressure–electric oil pump power map was proposed to describe the power supply requirement according to the viscosity index and the required line pressure. Using the viscosity index–line pressure–electric oil pump power map, an electric oil pump control algorithm was suggested to control the electric oil pump by using multi-stage power for a given viscosity index. The mechanical oil pump speed at which the electric oil pump is turned off was obtained on the basis of the flow consumption model. The electric oil pump control algorithm was evaluated by experiments and simulations. The proposed electric oil pump control algorithm satisfied the target line pressure requirement according to the viscosity index. In addition, an electric oil pump control strategy during an automatic transmission gear shift was suggested for the situation in which the maximum line pressure required for the gear shift cannot be achieved by only the mechanical oil pump. The electric-oil-pump-assisted power was determined from the flow consumption model and the mechanical oil pump speed considering the gear shift. The simulation results confirmed that the electric oil pump control strategy satisfied the maximum line pressure during a gear shift.</P>