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Naïve Decode-and-Forward Relay Achieves Optimal DMT for Cooperative Underwater Communication
Shin, Won-Yong,Yi, Hyoseok The Korea Institute of Information and Commucation 2013 Journal of information and communication convergen Vol.11 No.4
Diversity-multiplexing tradeoff (DMT) characterizes the fundamental relationship between the diversity gain in terms of outage probability and the multiplexing gain as the normalized rate parameter r, where the limiting transmission rate is give by rlog SNR (here, SNR denote the received signal-to-noise ratio). In this paper, we analyze the DMT and performance of an underwater network with a cooperative relay. Since over an acoustic channel, the propagation delay is commonly considerably higher than the processing delay, the existing transmission protocols need to be explained accordingly. For this underwater network, we briefly describe two well-known relay transmissions: decode-and-forward (DF) and amplify-and-forward (AF). As our main result, we then show that an instantaneous DF relay scheme achieves the same DMT curve as that of multiple-input single-output channels and thus guarantees the DMT optimality, while using an instantaneous AF relay leads at most only to the DMT for the direct transmission with no cooperation. To validate our analysis, computer simulations are performed in terms of outage probability.
송한,황정현,Jaehee Myung,Hyoseok Seo,Hyojeong Yi,Hee-Sun Sim,Bong-Su Kim,William C. Nierman,김희남 한국분자세포생물학회 2009 Molecules and cells Vol.27 No.2
Pathogens Burkholderia pseudomallei (Bp) and Burkholderia mallei (Bm) contain a large number (> 12,000) of Simple Sequence Repeats (SSRs). To study the extent to which these features have contributed to the diversification of genes, we have conducted comparative studies with nineteen genomes of these bacteria. We found 210 genes with characteristic types of SSR variations. SSRs with nonamer repeat units were the most abundant, followed by hexamers and trimers. Amino acids with smaller and nonpolar R-groups are preferred to be encoded by the variant SSRs, perhaps due to their minimal impacts to protein functionality. A majority of these genes appears to code for surface or secreted proteins that may directly interact with the host factors during pathogenesis or other environmental factors. There also are others that encode diverse functions in the cytoplasm, and this protein variability may reflect an extensive involvement of phase variation in survival and adaptation of these pathogens.
Seungjin Kang,Sooyoung Yoo,Hyunyoung Baek,Junheon Lee,Younggeun Choi,Hyangjung Kim,Hyoseok Yi,Eun Joo Yang 대한의용생체공학회 2019 Biomedical Engineering Letters (BMEL) Vol.9 No.2
The aim of this study was to examine the feasibility of the Smart dynamometer as a rehabilitation exercise device in a dailycare by comparing with the existing medical devices. We used and analyzed clinical and measurement data of breast cancersurvivors who have used Smart dynamometer during their rehabilitation after breast cancer surgery. The Smart dynamometerwas compared with the two existing devices of Takei dynamometer and surface electromyography (sEMG) that were usedin routine care, respectively. Three key components of the rehabilitation exercise devices were analyzed to validate the feasibilityof the Smart dynamometer: grip strength, reaction time, and grip endurance time. Pearson’s correlation analysis wasperformed to compare the statistical signifi cance between the devices. The data of 12 and 15 female breast cancer patientswere analyzed for comparing the Smart dynamometer with Takei dynamometer and sEMG, respectively. There was a veryweak correlation between the maximum values from the Takei and the Smart dynamometers in the aff ected and non-aff ectedarms of breast cancer patients (r = 0.5321, 0.4733). Comparisons of 3 features between the Smart dynamometer and sEMGshowed that there were strong positive correlations for both reaction time and endurance time in the aff ected and non-aff ectedarms (r > 0.9). The feasibility of the Smart dynamometer for the possible use in a daily rehabilitation exercise was partiallyverifi ed. Moreover, since the Smart dynamometer was highly correlated with time-related variables, it was important andsignifi cant to measure both grip strength and time-related information.