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Continuous Phase Modulation of F-QPSK-B Signals
Park, Hyung Chul,Lee, Kwyro,Feher, Kamilo IEEE 2007 IEEE Transactions on Vehicular Technology VT Vol.56 No.1
<P>A continuous phase modulation (CPM) implementation alternative of a recently standardized class of Feher-patented quadrature phase-shift keying (F-QPSK-B) modulation is proposed. Based on the fact that the F-QPSK-B signal has a quasi-constant envelope and continuous phase characteristics, it is shown that it can indeed be generated by the CPM scheme. For example, an F-QPSK-B signal can be fully generated using an existing FM-based transmitter with a modulation index of 0.5. Furthermore, a premodulation filter and an alternating change monitor differential encoder for the continuous-phase-modulated F-QPSK-B signal to be fully compatible with the I/Q modulated F-QPSK-B signal are proposed, allowing direct symbol-by-symbol coherent detection without the use of any special decoding schemes inherent in all CPM schemes. It is shown that the power spectral density and eye diagram of the continuous-phase-modulated F-QPSK-B signal are practically the same as those of the I/Q modulated F-QPSK-B signal. By utilizing CPM characteristics, an optimum maximum-likelihood (ML) coherent receiver for the F-QPSK-B signal is proposed. It is shown that the bit-error-rate performances of the optimum ML coherent detection, symbol-by-symbol coherent detection, and noncoherent detection of the continuous-phase-modulated F-QPSK-B signal are almost the same as those of the I/Q modulated F-QPSK-B signal</P>
Expectation of smart mentality and citizen participation in technology-driven cities
Katalin Feher 국제구조공학회 2021 Smart Structures and Systems, An International Jou Vol.27 No.3
The purpose of the paper is to investigate the expectations of smart mentality and citizen participation in technology-driven cities. 150 mainstream trend reports, white papers, and research summaries are analyzed in one corpus as business, governmental, and university research cooperations. The changing trends of the related academic literature frame the study. Keyword statistics, word pairs, content networks, and correlation matrix reveal the expected citizen participation. The most referenced top ten cities and their strategies support the understanding of the smart mentality behind the participation. According to the findings, open data, communities, collective participation, socio-technical engagement, and empowerment are the most expected human factors. Anonymity, neighborhood-based implementations, and temporary human roles are underrepresented in the corpus, as well as the privacy concerns and ethical issues. However, the emerging AI technology and the interpretative metaphors with rainforest, team player, and public agora urge a focus also on these indicators with a contribution of citizen engagement. The paper provides governmental policymaking and the academic research of technology-driven cities with a citizen-centric and complex summary.
Transgenic Strategy to Improve Stress Resistance of Crop Plants
Horvath, Gabor V.,Oberschall, Attila,Deak, Maria,Sass, Laszlo,Vass, Imre,Barna, Balazs,Kiraly, Zoltan,Hideg, Eva,Feher, Attila The Korean Society of Plant Biotechnology 1999 Plant molecular biology and biotechnology research Vol.1 No.1
Rapid accumulation of reactive oxygen species (ROS) and their toxic reaction products with lipids and proteins significantly contributes to the damage of crop plants under biotic and abiotic stresses. We have identified several stress activated alfalfa genes, including the gene of the alfalfa ferritin and a novel NADPH-dependent aldose/aldehyde reductase enzyme. Transgenic tobacco plants that synthesize alfalfa ferritin in vegetative tissues-either in its processed form in chloroplast or in the cytoplasmic non-processed form-retained photosynthetic function upon free radical toxicity generated by paraquat treatment and exhibited tolerance to necrotic damage caused by viral and fungal infections. We propose that by sequestering intracellular iron involved in generation of the very reactive hydroxyl radicals through a Fenton reaction, ferritin protects plant cells from oxidative damage. Our preliminary results with the other stress-inducable alfalfa gene (a NADPH-dependent aldo-keto reductase) indicate, that the encoded enzyme may play role in the stress response of the plant cells. These studies reveal new pathways in plants that can contribute to the increased stress resistance with a potential use in crop improvement.