Frequency-domain implementation of block adaptive filters for ICA-based multichannel blind deconvolution+I3055

In this paper, we present frequency-domain implementations of two adaptive multichannel blind deconvolution filters that employ the independent component analysis principle. The proposed implementations achieve considerable computational gains, which is shown by performing detailed analysis on the computational complexity. Particularly, our implementations incorporate a nonholonomic constraint to deal with overdetermined cases. The developed algorithms were successfully applied to the blind separation of real-world speech signals

An 8 x 8 nRERL serial multiplier for ultra-low-power applications

An 8 x 8-b nRERL serial multiplier is implemented in a 0.6- m n-well 3-metal CMOS pro- cess. nRERL (nMOS Reversible Energy Recov ery Logic) is a new reversible adiabatic logic circuit, which can be operated at the leakage-current lev el for ultra- low-energy applications. Measurement results show ed that the nRERL serial multiplier consumed only 0.9 % of the energy dissipation of the static CMOS one at the operating frequency 100 kHz at 5V, where its adiabatic and leakage losses were about equal.The test chip was fabricated with the help of IDEC program of KAIST, Taejon, Korea. This paper was sup- ported by NON DIRECTED RESEARCH FUND, Korea Research Foundation,throught Inter-university Semicon- ductor Research Center, Seoul National University, Seoul, Korea, from 1996 to 1999

Dewetting and Layer Inversion of Inverted PVP/PS Bilayer Films

This work was supported by the National Research Laboratory fund (Grant M1-0104-00-0191) from the Ministry of Science and Technology (MOST), the Ministry of Education through the Brain Korea 21 Program at Seoul National University, and the National R&D Project for Nano Science and Technology from MOST

Korea Seroprevalence Study of Monitoring of SARS-COV-2 Antibody Retention and Transmission (K-SEROSMART): findings from national representative sample

OBJECTIVES We estimated the population prevalence of antibodies to severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), including unreported infections, through a Korea Seroprevalence Study of Monitoring of SARS-CoV-2 Antibody Retention and Transmission (K-SEROSMART) in 258 communities throughout Korea. METHODS In August 2022, a survey was conducted among 10,000 household members aged 5 years and older, in households selected through two stage probability random sampling. During face-to-face household interviews, participants self-reported their health status, COVID-19 diagnosis and vaccination history, and general characteristics. Subsequently, participants visited a community health center or medical clinic for blood sampling. Blood samples were analyzed for the presence of antibodies to spike proteins (anti-S) and antibodies to nucleocapsid proteins (anti-N) SARS-CoV-2 proteins using an electrochemiluminescence immunoassay. To estimate the population prevalence, the PROC SURVEYMEANS statistical procedure was employed, with weighting to reflect demographic data from July 2022. RESULTS In total, 9,945 individuals from 5,041 households were surveyed across 258 communities, representing all basic local governments in Korea. The overall population-adjusted prevalence rates of anti-S and anti-N were 97.6% and 57.1%, respectively. Since the Korea Disease Control and Prevention Agency has reported a cumulative incidence of confirmed cases of 37.8% through July 31, 2022, the proportion of unreported infections among all COVID-19 infection was suggested to be 33.9%. CONCLUSIONS The K-SEROSMART represents the first nationwide, community-based seroepidemiologic survey of COVID-19, confirming that most individuals possess antibodies to SARS-CoV-2 and that a significant number of unreported cases existed. Furthermore, this study lays the foundation for a surveillance system to continuously monitor transmission at the community level and the response to COVID-19