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V-BLAST OFDM 시스템을 위한 그룹화된 부채널 기반의 간단한 형태의 비트 할당 기법
박대진,양석철,김종원,유명식,이원철,신요안,Park Dae-Jin,Yang Suck-Chel,Kim Jong-Won,Yoo Myung-Sik,Lee Won-Cheol,Shin Yo-An 한국통신학회 2006 韓國通信學會論文誌 Vol.31 No.7C
본 논문에서는 V-BLAST(Vertical-Bell labs LAyered Space-Time) 검출기를 사용하는 MIMO-OFDM(Multi Input Multi Output-Orthogonal Frequency Division Multiplexing) 시스템에서, 그룹화된 부채널 기반의 간단한 형태의 비트 할당 기법인 SBA-GS(Simplified Bit Allocation based on Grouped Sub-channels)를 제안한다. 2차원 Water Pouring 원리에 기반하여 MIMO-OFDM 시스템 수신단에서 각 부채널별 비트수 및 전력을 결정하여 궤환하는 일반적인 ABPA(Adaptive Bit and Power Allocation)은 비트오율 측면에서 최적의 성능을 보이지만, 수신단에서 송신단으로의 많은 양의 궤환 정보를 필요로 하고 시스템이 복잡하다는 단점을 가진다. 이러한 단점을 보완하기 위해, 상태가 우수한 각 부채널에 동일한 수의 비트를 할당하여 송신단에서 수신단으로의 궤환 정보량과 시스템 복잡도를 감소시킨 SBA가 제안된 바 있다. 본 논문에서 제안하는 SBA-GS 는 부채널들을 그룹화한 뒤 각 그룹별 부채널들의 펑균 신호대잡음비를 구하여 동일한 변조 방식을 적용하는 SBA를 수행한다. 다양한 차세대 이동통신 채널 환경에서의 모의실험 결과, 지연 확산이 작은 다중 경로 채널의 경우에서는 궤환 정보량을 크게 감소하면서도 SBA와 유사한 결과를 얻을 수 있었 으며, 지연확산이 큰 채널 환경에서는 부채널 그룹화에 따른 BER 성능 열화가 상대적으로 증가하였지만 궤환 정보량 감소와의 절충 관계를 감안할 때 실제 시스템 구현시 고려될 수 있는 우수한 결과를 보임을 확인하였다. In this paper, we present a bit allocation scheme based on grouped sub-channels for MIMO-OFDM (Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing) systems using V-BLAST (Vertical-Bell laboratories LAyered Space-Time) detector. A fully adaptive modulation and coding scheme may provide optimal performance in the MIMO-OFDM systems, however it requires excessive feedback information. Instead, SBA (Simplified Bit Allocation) scheme for reduction of feedback overhead, which applies the same modulation and coding to all the good sub-channels, may be considered. The proposed scheme in this paper named SBA-GS (Simplified Bit Allocation based on Grouped Sub-channels) groups sub-channels and assigns the same modulation and coding to the set of selected sub-channel groups. Simulation results show that the proposed scheme achieves comparable bit error rate performance of the conventional SBA scheme, while significantly reducing the feedback overhead in multipath channels with small delay spreads.
친환경 셀룰로오스 아세테이트 판재의 안경테 가공 공정별 물성 특성 연구
박대진(Dae Jin Park),이세근(Se Guen Lee),이해성(Hae Sung Lee),이성준(Sung Jun Lee),정상원(Sang Won Jung),김현철(Hyun-chul Kim),고영준(Young Jun Go) 한국안광학회 2015 한국안광학회지 Vol.20 No.1
Purpose:For optimizing properties of final glasses frame, the aim of this study is to examine the correlation of processing conditions and properties of cellulose acetate (CA) sheets through the investigation of properties of CA sheets prepared under processing steps. Methods: The properties of CA sheets were investigated in terms of different glasses frame processing conditions, bending process, barrel process, and ultrasonic cleaning process. CA sheets prepared through the sequential processing were examined by various analysis: gloss, mechanical properties, thermal properties. Results: After barrel process, hardness and tensile strength of CA sheet were increased. However, bending strength and impact strength were decreased. It is suggested the CA sheet had became rather stiff state (brittle). Also, in degradation temperature region of plasticizer, about 3% of reduction in plasticizer weight was confirmed upon TGA analysis. Conclusions: Glasses frame process, especially in the barrel process have a profound influence on the properties of CA sheet owing to reduction of total amount of plasticizer.
박대진(Park. Dae-Jin),김재균(Kim. Jae-Kyun),이재훈(Lee. Jae-Hoon) 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1
Cheonggyecheon rediscovering project was finally processed in July, 2003. As Cheonggyecheon rediscovered, the surroundings should be redeveloped. This thesis is based on this fact and is trying to suggest a model plan for the redevelopment of Gwangjang market place area which is containing the traditional form of street of Cheonggyecheon through the mathematical and graphic study of existing small street of Gwangjang market place.
논문(論文) : CFD모사 기법을 이용한 관내 혼화장치내 흐름 특성 평가
박대진 ( Dae Jin Park ),박영오 ( Young Oh Park ),박노석 ( No Suk Park ),김성수 ( Seong Su Kim ),왕창근 ( Chang Ken Wang ) 대한상하수도학회 2008 상하수도학회지 Vol.22 No.3
The modified in-line mixer which was suggested in this study for small water treatment facilities was evaluated on the performance of coagulation. For the objectives of this research, computational fluid dynamics(CFD) simulation was applied for analysis of flow characteristics within the modified in-line mixer. For verifying the results of CFD simulation, wet tests for the pilot plant were conducted. The wet test was to measure the actual coagulant dispersion distribution on the overall crosssection at a distance of 5.5D from the chemical injection point. From the results of CFD simulation and wet test, it was shown that the coagulant dispersion within the modified in-line mixer was occurred more uniformly than within the existing PDM(Pump diffusion Mixer). The results have confirmed the modified in-line mixer had several advantages compared with the existing PDM in terms of dispersion efficiency.