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Practical Short-Length Coding Schemes for Binary Distributed Hypothesis Testing
Get PDFThis paper investigates practical coding schemes for Distributed Hypothesis Testing (DHT). While the literature has extensively analyzed the information-theoretic performance of DHT and established bounds on Type-II error exponents through quantize and quantize-binning achievability schemes, the practical implementation of DHT coding schemes has not yet been investigated. Therefore, this paper introduces practical implementations of quantizers and quantize-binning schemes for DHT, leveraging short-length binary linear block codes. Furthermore, it provides exact analytical expressions for Type-I and Type-II error probabilities associated with each proposed coding scheme. Numerical results show the accuracy of the proposed analytical error probability expressions, and enable to compare the performance of the proposed schemes.2024 IEEE International Symposium on Information Theory (IEEE ISIT 2024), Athens, Greece, July 7-12, 202
Electrokinetics of nitrite to ammonia conversion in the neutral medium over a platinum surface
Get PDFPolycrystalline Pt electrode was employed to selectively convert nitrite ions (NO2-) into useful nitrogenous compound through electrochemical reduction reaction in neutral medium. According to adsorptive stripping analysis, the reduction process produced nitric oxide (NO) on the surface of Pt electrode. The spectroscopic test and gas chromatographic studies discovered the presence of ammonia (NH3) in the electrolyzed solution, suggesting the transformation of adsorbed NO into NH3 during the reverse scan. Scan rate dependent investigation was performed to elucidate kinetic information relating to this reaction on Pt surface. From Ep vs scan rate (υ) and jp vs υ (logarithmic plot), it was found that the conversion of NO2- ion into NO is an irreversible reaction which relies on the diffusion of NO2- ions to electrode surface. The Tafel analysis unveiled that the first electron transfer sets the overall reaction rate, having formal reduction potential, E0’ = −0.46 V and standard heterogeneous rate constant, k0 = 1.07 × 10-2 cm s−1. Reductive transfer coefficient (α) is another kinetics parameter, which was found to be approximate 0.77 from the difference between Ep and Ep/2 of the voltammograms obtained over scan rate range 0.005 V s−1 to 0.250 V s−1, indicating a stepwise process. According to temperature-dependent voltammograms, the nitrite reduction reaction on Pt had a calculated activation energy of about 19.8 kJ mol−1 and a pre-exponential factor of about 8.39 ×103 mA cm−2
Fast convergence to an approximate solution by message-passing for complex optimizations
No full textMessage-passing (MP) is a powerful tool for finding an approximate solution in optimization. We generalize it to nonlinear product-sum form, and numerically show the fast convergence for the minimum feedback vertex set and the minimum vertex cover known as NP-hard problems. From the linearity of MP in a logarithmic space, it is derived that an equilibrium solution exists in a neighborhood of random initial values. These results will give one of the reason why the convergence is very fast in collective computation based on a common mathematical background
New design in game and visualization approach for physics formula learning
Get PDFSupervisor: 長谷川 忍先端科学技術研究科修士(情報科学