This paper investigates simultaneous transmitting and reflecting reconfigurable intelligent surface (STAR-RIS)-assisted multi-user downlink (dl) communications with a primary focus on maximizing information secrecy by...
详细信息
A model is described that uses Boolean rule matrices that are equivalent to implication digraphs to transform truth states associated with rule conditions into deduced or abduced truth states. Such transformations rea...
详细信息
A model is described that uses Boolean rule matrices that are equivalent to implication digraphs to transform truth states associated with rule conditions into deduced or abduced truth states. Such transformations realize propositional logic to deduce controls for complex real-time noninteractive systems. The algorithm runs in deterministically polynomial time and is easy to implement. The rule matrix is decomposable into subsystems with rule submatrices for distributed processing in multiple microprocessors. A single transformation of a truth state fires every entire implication path for which the initial, i.e. root, condition is true, whereas a user-interactive production system fires a single rule at a time and uses the output in the firing of other rules. The method can be used to perform stimulus-response-type control such as humans use to perform such feats as flying airplanes, riding bicycles, or controlling nuclear reactors.
The capacitative network representation of transformer windings has long been used for the study of pulse distribution along the windings. However, the author's test results and those published in the literature s...
详细信息
The capacitative network representation of transformer windings has long been used for the study of pulse distribution along the windings. However, the author's test results and those published in the literature show that theoretical analysis based on this equivalent network may not be applicable. It was found that the capacitive network approximations were valid only within certain ranges of frequency. The frequency ranges were determined through the analysis of terminal measurements. The capacitatively transferred components of the input pulse along the windings in the appropriate frequency range were then extracted by the aid of digital filtering techniques, and good agreement between measured and theoretical distributions was obtained. These techniques, in conjunction with a new straight-line interpolation method, were employed to locate simulated partial discharges in a 66 and 132 kV transformer winding. Measurement results showed that an accuracy of better than 5% of winding length was obtained
Real-time multi-media applications are increasingly mapped on modern embedded systems based on multiprocessor systems-on-chip （MPSoC）. Tasks of the applications need to be mapped on the MPSoC resources efficiently i...
详细信息
Real-time multi-media applications are increasingly mapped on modern embedded systems based on multiprocessor systems-on-chip （MPSoC）. Tasks of the applications need to be mapped on the MPSoC resources efficiently in order to satisity their performance constraints. Exploring all the possible mappings, i.e., tasks to resources combinations exhaustively may take days or weeks. Additionally, the exploration is performed at design-time, which cannot handle dynamism in applications and resources＇ status. A runtime mapping technique can cater for the dynamism but cannot guarantee for strict timing deadlines due to large computations involved at run-time. Thus, an approach performing feasible compute intensive exploration at design-time and using the explored results at run-time is required. This paper presents a solution in the same direction. Communicationaware design space exploration （CADSE） techniques have been proposed to explore different mapping options to be selected at run-time subject to desired performance and available MPSoC resources. Experiments show that the proposed techniques for exploration are faster over an exhaustive exploration and provides almost the same quality of results.
An important aspect of database processing in parallel computer systems is the use of data parallel algorithms. This paper presents several parallel algorithms for the relational database join operation in a hypercube...
详细信息
An important aspect of database processing in parallel computer systems is the use of data parallel algorithms. This paper presents several parallel algorithms for the relational database join operation in a hypercube multicomputer system. The join algorithms are classified as cycling or global partitioning based on the tuple distribution method employed. The various algorithms are compared under a common framework, using time complexity analysis as well as an implementation on a 64 node NCUBE hypercube system. In general, the global partitioning algorithms demonstrate better speedup. However, the cycling algorithm can perform better than the global algorithms in specific situations, viz., when the difference in input relation cardinalities is large and the hypercube dimension is small. We also study the usefulness of the data redistribution operation in improving the performance of the join algorithms, in the presence of uneven data partitions. Our results indicate that redistribution significantly decreases the join algorithm execution times for unbalanced partitions.
The story of the origin and impetus for the outside financial support, and to some extent the industrial effort that first made the klystron available for use in systems, is reconstructed from the visitor register for...
详细信息
The story of the origin and impetus for the outside financial support, and to some extent the industrial effort that first made the klystron available for use in systems, is reconstructed from the visitor register for the Sperry Gyroscope Company plant in San Carlos, California, which operated only from June 1939 through November 1940 and where klystron tubes were first manufactured. The facility never had more than 12 employees, but it was a crossroads for visitors with widely different levels of interest and responsibility. The background to the activities at Sperry is given. Many of the 115 visitors who signed the register were contacted, and valuable information was obtained from them. This information is combined with information from other sources to form a historical mosaic created around individuals who played important roles in bringing new systems and equipment into being between 1940 and 1945.
It is shown that by using a proper transformation of state variables, the third-order system of the parallel resonant converter (PRC) with LLC-type commutation can be analyzed by means of a two-dimensional state-plane...
详细信息
It is shown that by using a proper transformation of state variables, the third-order system of the parallel resonant converter (PRC) with LLC-type commutation can be analyzed by means of a two-dimensional state-plane diagram. A set of characteristic curves which can be used for the converter design is derived from the analysis. It is shown from these curves that the converter possesses more desirable features than the conventional PRC.
A class of information-theoretic problems is introduced that deal with systems in which information is transmitted through a series of noisy channels, with limited or no processing between channels. Some basic questio...
详细信息
A class of information-theoretic problems is introduced that deal with systems in which information is transmitted through a series of noisy channels, with limited or no processing between channels. Some basic questions that arise in such systems are examined in detail. The effects of ordering of the channels on overall capacity and the characteristics that cause channels to have high capacity when cascaded with themselves are dealt with.
Noninvasive microwave hyperthermia is an attractive cancer treatment modality. Understanding the advantages and limitations of focusing are vital for the practical implementations of electromagnetic heating of deep tu...
详细信息
Noninvasive microwave hyperthermia is an attractive cancer treatment modality. Understanding the advantages and limitations of focusing are vital for the practical implementations of electromagnetic heating of deep tumors. These, as well as the important issues of tissue coupling and proper choices of polarization and frequency are herein examined. An optimal theoretical source distribution and an applicator design that approximates this distribution are discussed.
A practical technique for measuring the dielectric constant of vegetation leaves and similarly thin materials is presented. A rectangular section of the leaf is placed in the transverse plane in rectangular waveguide,...
详细信息
A practical technique for measuring the dielectric constant of vegetation leaves and similarly thin materials is presented. A rectangular section of the leaf is placed in the transverse plane in rectangular waveguide, and the magnitude and phase of the reflection coefficient are measured over the desired frequency band using a vector network analyzer. By treating the leaf as an infinitesimally thin resistive sheet, an explicit expression for its dielectric constant is obtained in terms of the reflection coefficient. Because of the thin-sheet approximation, however, this approach is valid only at frequencies below 1.5 GHz. To extend the technique to higher frequencies, higher-order approximations are derived and their accuracies are compared to the exact dielectric-slab solution. For a material whose thickness is 0.5 mm or less, the proposed technique was found to provide accurate values of its dielectric constant up to frequencies of 12 GHz or higher.< >
暂无评论