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Energy efficiency of the process equipment is achieved by the use of modern energy-saving electric drives. One of the ways of development such systems is the use of induction motor electric drive with power factor correction (PFC). The article provides analysis of PFC, built on the boost voltage converter, develop of its control system and also functional model, made in Matlab Simulink.
The dynamic capability of an Electro-Hydrostatic Actuator(EHA) to drive a heavy load with a large inertia was studied by both theoretical simulation and experiments, with a general simplified control model presented to explain the dynamic relations of EHAs and their loads. It shows that, with compact monolithic structural designs for both the actuator and its servo-motor-pump, using a notch filter...
Due to the high-frequency disturbances and fast velocity, the seeker dynamic characteristics in an missile or the airborne opto-electronic platform changes dramatically, leading to time-varying and nonlinear tracking loop (also called position loop) error. The traditional PID scheme using constant parameters cannot achieve high performance in terms of either accuracy or fast response. In this paper,...
In precise real-time systems, scheduling algorithms without considerable complexity are more effective to be applied. Virtual release advancing [3] for shorter response times is a technique that is valuable for the Earliest Deadline First (EDF) scheduling, but not adaptive to precise systems due to its high time complexity. A new scheduling algorithm, called enhanced virtual release advancing, that...
Due to the fluctuation of the bandwidth consumption of mobile users, the availability of a more flexible bandwidth pricing structure becomes important. Unfortunately, most mobile service providers only offer long-term contracts. Hence, wireless bandwidth sharing has a potential to become a niche market. In this paper, we propose the pay-per-second model, in which the price is based on the mobile net...
In today's scenario, the complexity, loss, cost and size of system are prime requirements of the end user. This paper shows the design technique, parametric analysis, and simulated and fabricated results of parallel coupled transmission line filter operating at 2 GHz, the most used frequency in wireless systems. Microstrip and Stripline technologies are very common for implementation of bandpass and...
The high peak to average power ratio (PAPR) and large spectrum sidelobe power are the two major limitations at the transmitter side of the NC-OFDM based Cognitive Radio (CR) system, which may significantly reduce the power efficiency and performance of the system. There are many techniques in the literature to reduce high PAPR and large spectrum sidelobe power. In this paper, we present a new optimization...
The problem arises when there is no tool that can help users to make best decision for choosing provider that meets user requirements satisfactorily. Available tools only compare the services of providers without considering user requirements. Thus the objective of this paper is to present a tool, called PTUR to meet the requirements and satisfaction of user from the selected providers that are ranked...
Peer to Peer (P2P) is a collection of peers in which each peer has their own power and responsibility. Peer communicates with other peers for accessing their services. This feature of P2P makes it vulnerable to different type of attacks. Trust and Reputation models can be used to minimize the impact of such threats. Maintaining trust in P2P network is required to enhance secure communication in peer...
This paper proposes an approach to solve the problem of LTE EPS network parametric synthesis taking into account self-similar properties of multiservice traffic. The problem is solved with the known source data such as network topology, traffic routes, statistical data on the demand for information and communication services. The article proposes the calculation expressions to determine the parameters...
The improvement of the scalability of routing decisions is quite relevant in modern telecommunication networks. In this regard, effective approach is associated with the implementation of hierarchical routing. This involves carrying out a structural and functional decomposition of the network, based on the introduction and supporting of multi-level routing decisions. However, the existing protocol...
Radar detection of fast moving targets at long range, such as ballistic missiles and space objects, poses a significant challenge due to unknown intra-dwell target motion and changes in range-Doppler coupling. This paper describes a new technique to mitigate these problems through the use of a novel waveform and pulse pattern design process which eliminates pulse-to-pulse changes in the received compressed...
In dynamic bandwidth management based on traffic prediction, the traffic flows can be modeled as time-series data. State-of-the-art technique used in modeling this traffic flows is by using a linear model. In contrast, Recurrent Neural Network (RNN) has been the state-of-the-art technique in speech recognition, which data is also time-series. Therefore, we conjecture that the use of RNN can improve...
This paper reviews the performance difference and similarity in modeling system dynamics and the efficiency of error elimination with fewer fluctuation and adaptability to set point variation between the traditional fixed parameter proportional-integral-derivative controller and the model reference neural net controller applied to aircraft pitch attitude control. The designs of both controllers are...
This article presents a compact piezoelectric vibration energy harvester (VEH) using multiple nonlinear techniques. Spring-plate and a manually tunable stopper-plate was used to tune the resonance frequency and broaden the bandwidth of VEH. Experimentally, the VEH can be operated in three kinds of work modes according to the gap distance between the spring-plate and the stopper-plate. The simulation...
In this paper, qualification of the p-cascade tuned filter capacity estimation is presented for radio communication systems using multiposition phase-shift keyed signals with n-discrete states. It is shown that the capacity will be limited to the resolution time of linear systems that are present in the RCS linear radio-frequency section and that are an integral part of channel. The method of estimating...
This paper presents an accurate design approach for two-stage CMOS operational amplifiers developed based on the usual design procedure. It eliminates the errors existed in design results by employing the accurate MOS model and carrying out the design procedure iteratively. The specifications of the amplifier designed by this approach match exactly with the user specified values. A design example...
The Digital Agenda for Europe (DAE) mandates that 100-Mbit/s Internet access should be available to 50% of the households. Fiber to the Cabinet and Fiber to the Building are appealing architectures to quickly achieve this goal. This paper compares the standard copper technologies G.fast, VDSL2 and their enhancements in a multi-operator environment. The paper shows that both G.fast and the new EVDSL...
Remote GPU execution has been proven to increase GPU occupancy and reduce job waiting time in multi-GPU batch-queue systems, by allowing jobs to utilize remote GPUs when there are not enough unoccupied local GPUs available. However, for GPU communication intensive applications, remote GPU communication overhead may account for more than 70% of the applications' execution times. The need for using...
WSNs with randomly deployed nodes, to reduce energy consumption while ensuring the connectivity and power of entire network is an important issue of research. A mobility and energy-aware cross-layer searching routing algorithm works in stationary and mobile scenario with the satisfactory performance in addition to mobility handling, provides route to nodes which forward data between each other directly...
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