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The relation between low-density parity-check (LDPC) codes and hypergraphs supports searching for powerful LDPC codes based on hypergraphs. On the other hand, coding theory methods can be used in searching for hypergraphs with large girth. Moreover, compact representations of hypergraphs based on convolutional codes can be found. Algorithms for iteratively constructing LDPC codes with large girths
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På uppdrag av Wirsbo Bruks har Avd Byggnadsmaterialära gjort en mindre laboratorieundersökning för att framför a1lt studera fuktförhöjning då kvarvarande byggfukt omfördelas i betongen vid användning av golvvärme. Uttorkningen av byggfukt måste drivas något 1ängre, dvs större mängd måste uttorkas.
The use of complex, time-varying electromagnetic field vectors in the analysis of pulse propagation problems in linear, homogeneous, bi-isotropic media is proposed. In the most general case, these dispersive materials are characterized by four time-dependent susceptibility kernels. Properly defined, the complex field vector satisfies a first-order, dispersive wave equation. Refractive, admittance,
Inverted pendulums are very well suited to investigate friction phenomena and friction compensation because the effects of friction are so clearly noticeable. This paper analyses the effect of friction on the Furuta pendulum. It is shown that friction in the arm drive may cause limit cycles. The limit cycles are well predicted by common friction models. It is also shown that the amplitudes of the
