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M.K. Bae,S.N. Yi,A.M. Green,D.H. Shin,J.H. Na,N.L. Kang,R.A. Taylor,박승환 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.3
We have studied the microscopic surface morphology of AlN which was revealed by using an atomic force microscopy (AFM). AlN was sputtered on Si (111) and Si (100) substrates for 30 and 60 minutes. AlN was observed to crystallize as cubic-AlN at an annealing temperature of 900 C and an annealing time of 60 minutes. We present a model to explain this cubic AlN bonding configuration. GaN was grown on AlN/Si(111) and AlN/Si(100) substrates by using a hydride vapor phase epitaxy technique. A terrace with saw-tooth-shaped formations was observed on the GaN surface and could be explained in terms of the lattice mismatch and the gas diusion rate.
Power Allocation for OFDM-Based Cooperative Relay Systems
V. K. Y. Wu,Y. G. Li,M. P. Wylie-Green,T. Reid,P. S. S. Wang 한국통신학회 2008 Journal of communications and networks Vol.10 No.2
Cooperative relays can provide spatial diversity and improve performance of wireless communications. In this paper, we study subcarrier power allocation at the relays for orthogonal frequency division multiplexing (OFDM)-based wireless systems. For cooperative relay with amplify-and-forward (AF) and decodeand- forward (DF) algorithms, we investigate the impact of power allocation to the mutual information between the source and destination. From our simulation results on word-error-rate (WER) performance, we find that the DF algorithm with power allocation provides better performance than that of AF algorithm in a single path relay network because the former is able to eliminate channel noise at each relay. For the multiple path relay network, however, the network structure is already resistant to noise and channel distortion, and AF approach is a more attractive choice due to its lower complexity.
Power Allocation for OFDM-Based Cooperative Relay Systems
Wu, Victor K. Y.,Li, Ye (Geoffrey),Wylie-Green, Marilynn P.,Reid, Tony,Wang, Peter S. S. The Korea Institute of Information and Commucation 2008 Journal of communications and networks Vol.10 No.2
Cooperative relays can provide spatial diversity and improve performance of wireless communications. In this paper, we study subcarrier power allocation at the relays for orthogonal frequency division multiplexing (OFDM)-based wireless systems. For cooperative relay with amplify-and-forward (AF) and decode-and-forward (DF) algorithms, we investigate the impact of power allocation to the mutual information between the source and destination. From our simulation results on word~error-rate (WER) performance, we find that the DF algorithm with power allocation provides better performance than that of AF algorithm in a single path relay network because the former is able to eliminate channel noise at each relay. For the multiple path relay network, however, the network structure is already resistant to noise and channel distortion, and AF approach is a more attractive choice due to its lower complexity.
Three-gene predictor of clinical outcome for gastric cancer patients treated with chemotherapy
Kim, H K,Choi, I J,Kim, C G,Kim, H S,Oshima, A,Yamada, Y,Arao, T,Nishio, K,Michalowski, A,Green, J E Nature Publishing Group 2012 The pharmacogenomics journal Vol.12 No.2
<P>To identify transcriptional profiles predictive of the clinical benefit of cisplatin and fluorouracil (CF) chemotherapy to gastric cancer patients, endoscopic biopsy samples from 96 CF-treated metastatic gastric cancer patients were prospectively collected before therapy and analyzed using high-throughput transcriptional profiling and array comparative genomic hybridization. Transcriptional profiling identified 917 genes that are correlated with poor patient survival after CF at <I>P</I><0.05 (poor prognosis signature), in which protein synthesis and DNA replication/recombination/repair functional categories are enriched. A survival risk predictor was then constructed using genes, which are included in the <I>poor prognosis signature</I> and are contained within identified genomic amplicons. The combined expression of three genes—<I>MYC</I>, <I>EGFR</I> and <I>FGFR2</I>—was an independent predictor for overall survival of 27 CF-treated patients in the validation set (adjusted <I>P</I>=0.017), and also for survival of 40 chemotherapy-treated gastric cancer patients in a published data set (adjusted <I>P</I>=0.026). Thus, combined expression of <I>MYC</I>, <I>EGFR</I> and <I>FGFR2</I> is predictive of poor survival in CF-treated metastatic gastric cancer patients.</P>
D.H. Shin,S.N. Yi,A.M. Green,H.M. Cho,J.H. Na,M.K. Bae,R.A. Taylor,S.H. Park,Y.J. Cho 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.6
We have studied the effect of annealing AlN buffer layers on the properties of subsequently grown GaN layers. The AlN buffer layer was deposited on a Si(111) substrate by using RF sputtering, and different samples were then annealed at temperatures of 700 C, 800 C, and 900 C. Thick GaN was grown using a hydride vapor phase epitaxy (HVPE) system for 1 hour at 1050 C with the resultant thickness being 150 μm. The morphologies of the AlN and the GaN layers were observed by using both atomic force microscopy (AFM) and scanning electron microscopy (SEM). The surface roughness and grain size of the AlN buffer layer was increased by raising the annealing temperature; this was accompanied by an improvement in the two-dimensional lateral growth of the GaN layer. X-Ray diffraction (XRD) patterns showed the typical results expected for GaN (0002) and (0004) faces, revealing a highly preferred orientation of the GaN(0001) surface. However, a residual compressive stress was observed between the GaN and the Si substrate, independent of the annealing treatment of the buffer layer.bp#?