The object sharing space is often used as a technology to realize distributed parallel processing that can compute computationally intensive and time-consuming problems in a short time. However, since the model is a server-client model, accesses are concentrated on the server that provides the object sharing space. Therefore, the more clients there are, the more bottlenecks occur in network communication, which hinders the performance improvement of distributed parallel processing. Therefore, the number effect, which is a performance indicator in distributed parallel processing, decreases as the number of clients increases. In this study, we developed a distributed parallel processing system using P2P, which allows clients to communicate with each other. By implementing unicast communication between clients for sending and receiving information, we have achieved distributed parallel processing using P2P. In addition, the main processing of the system, such as P2P communication, is implemented in a software structure that is independent of the specific computational processing. As a result of the evaluation, we confirmed that the performance of the distributed parallel processing was improved compared to the existing method using the object sharing space. Furthermore, we confirmed that the number effect does not decrease even when the number of clients increases. In addition, it is possible to implement distributed parallel processing with fewer files and lines than before.

To design robots worked in a high radiation dose environment, we investigated numerically radiation species and fluence distribution generated by irradiation of electrons with kinetic energy of 0.9 MeV into an aluminum plate. Numerical simulation results showed that photon was generated by irradiating the electron beam into the target plate, and no neutrons and protons were generated by the interaction. The photons were reflected and absorbed in a water region. We obtained the numerical simulation result for the decrease of fluence in an air region and the result of the radiation fluence with the inverse-square law as a function of distance. Also the radiation reduction with the distance for an experimental result was reproduced by the numerical simulation.

The short-circuit current flowing from the feet to the ground was numerically analyzed for human models located under transmission lines. The human model with wet feet stood upright on the ground, while holding an overhead metal plate or frame with both arms. A vertical uniform alternating current electric field of 3 kV/m and 50 Hz was applied to the model. The short-circuit current was analyzed by systematically changing the parameters such as height (≤9.34 m), width (≤9.34 m), thickness (≤5.4 cm), and holding point height (≤2.367 m) of the metal object. Each parameter's value was examined when the short-circuit current exceeded the international protection guideline value of 500 µA. Furthermore, the short-circuit current was modeled through a complete quadratic polynomial including all related parameters, and the fitting coefficient was calculated by the nonlinear least squares method. The obtained polynomial can express the analyzed short-circuit current with a difference of approximately −2.64%～3.90% in the case of plate holding model analysis. We believe this quadratic polynomial is appropriate because the short-circuit current is proportional to the amount of surface charge, which strongly depends on the surface area being analyzed.

The review function of the internet shopping is the function which the purchaser can write impression and evaluation of the goods. It is possible that the purchase applicant reads the product review, and that it obtains information of the product beforehand. However, some product reviews are not helpful because all buyers do not write reviews carefully. In this study, we analyze and evaluate product reviews by natural language processing using machine learning, and construct a system that rearranges products in order of reference. Learning is carried out using logistic regression so that the words which appears in the content of the review many times is made to be the learning feature, and the appropriate weight in which the learning feature affects the content of the product review is calculated. For the evaluation of the system, the QE method which is the evaluation method using the quick sort is proposed. By using the QE method, it was possible to evaluate whether the rearrangement was right. As a result of the experiment, it was confirmed that the proposed system could rearrange the product reviews with high accuracy.

This paper argues the applicability of two-dimensional simulations for a better understanding of the depth filtration mechanism and, in particular, the relationship between the electrostatic attractive force acting on particles and filtration performance. Physical characteristics of the filter media are that it has a porous structure, which allows fluids to pass through and retains particles, and is assumed to be deformed according to the interaction with fluids and particles. The flexible porous structure is modeled using “trapping particles” with spring and dashpot that can be charged electrically as well in this study. After confirming that computations of electric potential profiles are in good agreement with one-dimensional analytical solutions, depth filtration is simulated numerically both without and with the effect of the electrostatic field during the process. As a result, it is indicated that the moving particles can be retained by the flexible porous structure in the particle-liquid separation process.

A Halo antenna has the horizontally polarized and an omnidirectional radiation pattern in the horizontal plane. A Halo antenna operates when the circumference is about 0.5 wavelength, and the relative bandwidth is narrow. In this paper, we study the Halo antenna with three resonance characteristics by loading four parasitic elements with different gap angles. As a result, it is confirmed that the diameter and the relative bandwidth of the proposed antenna are 0.128λ (λ: the wavelength of the lowest operational frequency) and 12% (|S₁₁| ≤ −10 dB). Furthermore, the radiation patterns are the horizontally polarized and omnidirectional within the operating band.

In the present work, we shall describe an optimal control scheme to suppress the infected population with a simple time-dependent SIR model. From the present numerical simulation results, it will be elucidated that there exists an optimal time to start a corresponding infection control for certain basic reproduction number and effective production number under an appropriate control duration time. Furthermore it will be found that the deviation from the optimal control results in the reduction of the depression of the infected population.