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차량 구조물의 공진 주파수를 고려한 점용접부의 피로해석
이혁재(Hyuckjae Lee),임홍재(Hongjae Yim),김효식(Hyosig Kim),이상범(Sangbeom Lee) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper, a fatigue analysis considering resonance frequency is applied to the spot welds in a vehicle structure. The frequency response and the dynamic load in frequency domain are used. The fatigue estimations on the front subframe of the passenger car are performed by using the presented technique. To obtain the frequency response are carried out frequency response analysis. The imposed frequency domain fatigue analysis method is compared with the current time domain fatigue analysis method. The study shows that the fatigue life for spot welding considering dynamic character of vehicle system can be effectively estimated.
Distribution of Eigenvalues for 2x2 MIMO Channel Capacity Based on Indoor Measurements
Wonsop Kim,Hyuckjae Lee,Myung-Don Kim,Hyun Kyu Chung IEEE 2012 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS Vol.11 No.4
<P>Based on the non line-of-sight (NLOS) indoor measurements performed in the corridors on the third floor of the Electronics and Telecommunications Research Institute (ETRI) building in Daejeon city, Republic of Korea, we investigated the distribution of the eigenvalues of HH*, where H denotes a 2×2 multiple-input multiple-output (MIMO) channel matrix. Using the observation that the distribution of the measured eigenvalues matches well with the Gamma distribution, we propose a model of eigenvalues as Gamma distributed random variables that prominently feature both transmitting and receiving correlations. Using the model with positive integer k_i, i=1, 2, which is the shape parameter of a Gamma distribution, we derive the closed-form ergodic capacity of the 2×2 MIMO channel. Validation results show that the proposed model enables the evaluation of the outage and ergodic capacities of the correlated 2×2 MIMO channel in the NLOS indoor corridor environment.</P>
Rate Compatible Antenna Selection Scheme Using Punctured Space-Time Trellis Codes
Dongwook Lee,Hyoungsuk Jeon,Hyuckjae Lee 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
In this paper, punctured space-time trellis code (PSTTC) is suggensted for antenna selection strategies. Trellis coding gives coding gain in terms of error performance. Moreover, puncturing which leaves just one symbol at a symbol time provides same data rate as uncoded one. To maximize coding gain, the best modified generator matrix is proposed. The simulation results show that the proposed scheme provides additional coding gain without any sacrifieces of data rate.