Recent Advances in Electrical & Electronic Engineering - Volume 11, Issue 4, 2018

Background: Design of an ultra-low voltage 0.28V CMOS VCO based on current reused topology for low power application is presented. The high performance of ultra-low voltage operation is achieved by way of the transformer feedback and body bias technique. Methods: The total power dissipation can be achieved as low as 260μW, while VDD1 and VDD2 are both 0.28V. The swing of output signal above the VDD supply vo Read More

Objectives: The experimental platform of China Space Station has been designed. It can be used to study dynamics and attitude control of China Space Station. Dynamics model of China Space Station is made based on China's future space station system. Methods: Besides, simulation model of China Space Station is build, and its dynamics and attitude control is simulated. Conclusion: Finally, the experimental system is used to Read More

Background: This paper presents a novel Ultra-Wideband (UWB) balanced sub-nanosecond monocycle pulse generator sing Step Recovery Diodes (SRD) for an inter/intra-chip wireless interconnect communication system. Methods: The new UWB monocycle pulse generator has been simulated using Advanced Design System (ADS). This pulse generator employs wideband microwave bipolar transistor, transmission line, Schottky Read More

Background: A wide-band wide-beam Dielectric Resonator Antenna (DRA) is proposed in this paper. Methods: A cylindrical dielectric resonator operating in TM01δ mode is placed on a hybrid-structure ground which consists of a corner-reflector and a pentagon plate with edge-fold. With this structure, wide-band wide-beam characteristics can be achieved. Results: From simulation results, the impedance bandwidth (|S11|< -10 Read More

Background: Antenna can serve as transmitter or receiver of electromagnetic energy (power). Circular path antenna as a single and as an array microstrip antenna will be used in this paper. Methods: Five array microstrip antennas with different amount of patch will be designed to get different amount of return loss variables, as well as discovering its effect on the power efficiency of the antenna. Results: By discovering Read More

Background: The cooling effect of wind speed and wind direction was assessed using an 820concentrator photovoltaic module and wind tunnel. This study allowed us to define the best setting for concentrator photovoltaic module that allowed the highest cooling effect and temperature drop, which was the main goal of this research. Methods: Solar cell used in this module is triple-junction solar cell consists of InGaP/InGaAs/Ge Read More

Introduction: In Very Large Scale Integration (VLSI), routing is the process of making connections among objects reasonable in the specific area and some cost metrics (i.e., routability) are optimized. It is a crucial step in VLSI physical design as the performance of a chip depends on the routing results heavily. Methods: In this paper, by congestion-based routing modeling, a multilevel based routing optimization method is develop Read More

Objective: Aiming at the difficulty of extracting weak faulty vibration features of generator in practical performing, a novel method named self-adapted multi-scale top-hat transformation (SAMST) is proposed to enhance the detection of the characteristic vibration signals. Methods: Different from other studies, this method employs the Sine-Structure Element (SSE) which is more similar to the signals appear in electrical syste Read More

Background: Madeira Wine can only be sold to the final consumer after a certain aging process that improves its properties. This process requires investment in the wine itself, the storage space and the temperature control and monitorization. The aging process takes a minimum of 3 years but can go up to more than 10 years. Methods: It has been shown that it can be speed up if the wine is kept under certain conditions with a Read More

Objective: Effectiveness of data reduction directly influences the quality of reduced data, design of reduction process and selection of relevant algorithms or model, thus ultimately affecting flexibility and extension of the data reduction method and its implementation system. In view of the deficiencies of the data reduction effectiveness evaluation system including imperfection and weak applicability of index system, with la Read More

Objective: In view of the issue that particle swarm optimization algorithm is easy to fall into local optimal solution and low convergence precision when searching for the feasible space solution of complex multimodal functions, the paper proposes an adaptive particle swarm optimization algorithm (PSO) based on aggregation degree. Methods: The algorithm firstly makes a random disturbance to search global optimal solu Read More

Background: In this paper, we theoretically analyze the topic of topology optimization theory and parallel data analysis model based on resource scheduling algorithm for cloud computing. Cloud computing is a virtual computing resource pool, which provides dynamic deployment and allocation of these resources to the user via the Internet. Methods: Cloud storage is to focus on providing internet-based online service. Read More

Background: Aiming at the characteristics of PCB photoelectric image which have ambiguity and noise, a circle detection method of PCB photoelectric image based on improved Hough transform is proposed. Methods: Firstly, the basic principle of circle detection based on traditional Hough transform algorithm is discussed, and its disadvantages are pointed out. Secondly, the basic principle of circle detection method Read More

Background: In order to avoid undesired slide or damage, desired grasping force should be discrepant by the prosthetic hand when grasping soft or hard objects. Methods: A method was proposed in which a force sensor and an optical encoder are used to estimate the stiffness of the object being grasped. Based on contact-impact force model, a fuzzy logic system for stiffness estimation determined by contact force and the Read More

Background: In order to meet the air-conditioning temperature control requirement and save energy, the mathematical model of the plant and the heater temperature control system is constructed according to the principle of energy conservation on the basis of the characteristics of plant airconditioning system. Methods: According to this model, the conventional PID control and expert PID controller simulation are perform Read More

Background: Nowadays delay locked loops have a very wide range of applications in integrated circuits such as clock recovery circuits, microprocessors, memory circuits, frequency multipliers and synthesizers. Delay locked loops like Phase Locked Loops, mainly aim to synchronize the clock, nevertheless they have a lot of other advantages like high lock speed, unconditional stability, better jitter performance, and lo Read More

Background: Referring to Space-Time Coding (STC) in wireless MIMO communication and Gram-Schmidt procedure, we introduce a new procedure in the symbol combiner of the receiver that detects the transmitted symbols straightforwardly and more easily than the heuristic procedure presented by Alamouti. Methods: To find this combiner, we firstly project the vector of symbols in a two-dimensional orthonormal basis, Read More

Background: In this paper, the grounded and floating active inductors (GI and FI) employing Voltage Differencing Transconductance Amplifier (VDTA) as an active element are realized. Methods: To demonstrate the performance of both the inductors, two subsequent bandpass filter configurations (BPFGI and BPFFI) have been designed and implemented. The filter BPFGI (BPFFI) is designed at a center frequency of 1.3 Read More