An Alternative Statistical Characterization of TWDP Fading Model

Two-wave with diffuse power (TWDP) is one of the most promising models for the description of small-scale fading effects in 5G networks, which employs mmWave band, and in wireless sensor networks deployed in different cavity environments. However, its current statistical characterization has several fundamental issues. Primarily, conventional TWDP parameterization is not in accordance with the model’s underlying physical mechanisms. In addition, available TWDP expressions for PDF, CDF, and MGF are given either in integral or approximate forms, or as mathematically untractable closed-form expressions. Consequently, the existing TWDP statistical characterization does not allow accurate evaluation of system performance in all fading conditions for most modulation and diversity techniques. In this regard, physically justified TWDP parameterization is proposed and used for further calculations. Additionally, exact infinite-series PDF and CDF are introduced. Based on these expressions, the exact MGF of the SNR is derived in a form suitable for mathematical manipulations. The applicability of the proposed MGF for derivation of the exact average symbol error probability (ASEP) is demonstrated with the example of M-ary PSK modulation. The derived M-ary PSK ASEP expression is further simplified for large SNR values in order to obtain a closed-form asymptotic ASEP, which is shown to be applicable for SNR > 20 dB. All proposed expressions are verified by Monte Carlo simulation in a variety of TWDP fading conditions.

Mathematical modelling of dynamic characteristics of repair process for system operating under maintenance contracts

Repair rate is very important parameter in a system maintainability and it can be defined as frequency of the successfully performed repair actions on failed component per unit of time. This paper analyses the integral characteristics of a stochastic repair rate for corresponding values of availability in the system operating under maintenance contracts. The equation for the envelope line of the probability density function (PDF) maximums of the repair rate has been provided. This new expression can be used for planning of base stock levels and capacities of repair facilities. Namely, in that way instead of repair rate PDF equation, for some calculations we can use envelope line parameters, which are expressed in simpler mathematical form, to reduce the time required for calculations and prediction and enhance reactions in failure events. For analytical and numerical evaluation of system performance, the annual repair rate PDFs are analyzed like particular solutions of corresponding differential equation, while the existence of singular solution is considered and analyzed under different conditions. Moreover, we have derived optimal values of availability for which the PDF maximums have been obtained. Finally, in order to generalize behavior of the repair process, a partial differential equation, as a function of the repair rate process and availability parameter, has been formed.

Leveraging graph-based semantic annotation for the identification of cause-effect relations

This research is related to language article in Indonesia that discuss about causality relationship research used as public health surveillance information monitoring system. Utilization of this research is suitability of feature selection, phrase annotation, paragraph annotation, medical element annotation and graph-based semantic annotation. Evaluation of system performance is done by intrinsic approach using the Naive Bayes Multinomial method. The results obtained sequentially for recall, precision and f-measure are 0.924, 0.905, and 0.910.

EuroEXA Custom Switch: an innovative FPGA-based system for extreme scale computing in Europe

EuroEXA is a major European FET research initiative that aims to deliver a proof-of-concept of a next generation Exa-scalable HPC platform. EuroEXA leverages on previous projects results (ExaNeSt, ExaNoDe and ECOSCALE) to design a medium scale but scalable, fully working HPC system prototype exploiting state-of-the-art FPGA devices that integrate compute accelerators and low-latency high-throughputnetwork. Exascale-class systems are expected to host a very large number of computing nodes, from 104 up to 105, so that capability and performances of the interconnect architecture are critical to achieve high computing efficiency at this scale. In this perspective, EuroEXA enhances the ExaNet architecture, inherited by the ExaNeSt project, and introduces a multi-tier, hybrid topology network built on top of an FPGA-integrated Custom Switch that provides high throughput and low inter-node traffic latency for the different layers of the network hierarchy. Deployment of a few testbeds is planned, with incremental complexity and equipped with complete software stack and runtime environment, to support the integration and test of the network design and to allow for evaluation of system performance and scalability through benchmarks based on real HPC applications. Design and integration activities are ongoing and the first small scale prototype (50 nodes) is expected to be completed in fall 2020 followed, one year later, by the deployment of the larger prototype (250/500 nodes).

Sistem Pakar Diagnosa Kerusakan Laptop Menggunakan Metode Forward Chaining

Expert system is an aplication that can perform activities. This system can make a diagnosis like humans, foe example diagnosing hardware and software damage on laptops. This system is widely used in the field of science. This system contains the knowledge of the experts which transferred into the aplications. This system is mode to find a solution as an experts. Expert system can also provide an explanation of steps taken, and provide advice or conclusions on the type or damage to the laptop. This system is developed with purpose to help the users, from hadware and software damage. The case of damageneeden an expert in the settlement with her or his (expert) knowledge already transferred into the application. This system using forward chaining search method. This reasoning is used to examine the factors that are incorperated by rules stored in system, so that it can be concluded from factors collected. The software used to build that is dreamweaver, and to process the database using apache. The evaluation of system performance is using quesioner which elistributed to 100 respondents. The functionality criteria, a total is 861 and average is 86,1. The efficiency 843 and average is 84,1. The uasbility 824 and an average is 82,4 and then total portability is 810 with an average is 81,0.