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Online-store has become more and more popular in recent years. It has brought great benefits for the business. In the intense competitive environment, in order for an online-store to gain strength and competitive edge, it needs to possess a strong store image and to keep and satisfy its customers. In this paper, a model of relationship among online-store image, customer satisfaction and customer loyalty...
In context of keen competition among the online shopping platforms, sellers and developers are finding critical factors of recommendation system that could impact customer experience. In consideration of this, we propose a research model that examines the effects of two characteristics of recommendation, i.e. recommended way and recommendation performance, on customer online shopping experience. The...
As the error accumulation problem of Strapdown Inertial Navigation System (SINS), the accuracy of Doppler Velocity Log (DVL) measurements is a key element for the precision of SINS/DVL integrated navigation system. Nevertheless, level attitude dynamics of the vehicle (including pitch and roll motions) induced by random wave motions or vehicle's movement pattern changes introduce DVL measurement errors...
The singularity expansion method (SEM) assumes that the electromagnetic scattering wave of an object has a fixed poles distribution, i.e. the resonant frequency is fixed. So the object can be identified by extracting poles from radar data. While studying ground penetrating radar (GPR) echo signal features of nonmetallic pipelines, the paper finds that the GPR signal's frequency center downshifts when...
Energy storage systems for power system applications have currently attracted significant interest and attention as an enabling technology for integrating the growing capacity of distributed energy resources into the electric grid. Energy storage systems can provide a variety of solutions for the enhancement of the operational capabilities of the electric grid. This paper presents the modeling and...
The hydroelectric generating set (HGS) is the machine that transform the water energy to power. The vertical structure is more common which is applied in large and medium-sized system. Because of great bulk, the rotating parts including generator's rotor, macroaxis, turbine runner and spiral case are great heavy. In addition, water flow impulsing the runner will produce a down force named axial hydro-thrust...
Pressure ulcers, commonly called bedsores, are defined as injuries to the skin and underlying tissue resulting from prolonged pressure usually on bony areas of the body, such as heels and hips. In order to alleviate pressure accumulation at high-risk regions, the current practice in clinics requires caregivers to reposition their patients every two hours. This relies on the engagement of nursing services...
Distributed model predictive control for a hybrid system that comprises wind and photovoltaic generation subsystems, a battery bank and an ac load is developed in this paper. Consider that the wind subsystem and the solar subsystem are two spatial distributed energy generation systems, so we design a distributed MPC for optimal management and operation of distributed wind and solar energy generation...
A simple eigenvalue representation result that justifies the celebrated phase compensation principle, from algebraic point of view, is presented. The result generalizes phase compensation principle, it appears as a stability criterion, applicable to multi-machine systems. It allows us to find compensation angle for machines individually. Furthermore, the problem of gain coordination is also reduced...
Automatically retargeting analog designs to new technology is an efficient solution for reusing analog IPs. However, most of previous approaches focus on layout retargeting only. How to obtain the new device sizes for another technology is often not discussed. Simply scaling the device sizes may not reach the desired performance due to the non-ideal effects. Therefore, a layout-aware automatic sizing...
With the rapid development of the Smart Power Bulk Transmission Systems, single-core power cables above 110 kV are used more and more widely. The circulating current, generated on the cable metal sheath, brings additional loss to the cable metal sheath and makes cable safe operation life shortened. This paper studied and analyzed how circulating current on the metal sheath of single-core cables varied...
Many distributed control algorithms of current interest can be modeled by linear recursion equations of the form x(t + 1) = M(t)x(t), t ≥ 1 where each M(t) is a real-valued “stochastic” or “doubly stochastic” matrix. Convergence of such recursions often reduces to deciding when the sequence of matrix productsM(1), M(2)M(1), M(3)M(2)M(1), … converges. Certain types of stochastic and doubly stochastic...
Analog-to-digital conversion plays an essential role in all kinds of electronics systems, including signal processing, communications and storage. In particular, interpolated flash ADC has been widely used in high-speed systems requiring very high sampling speed. Obviously, practical ADC design is very challenging, which has been dominated by experiences and trial-and-error skills. This is true to...
In this paper, we at first studied the distribution of the interval between two consecutive packets (ITCP) for two-user networks. We then extend our interest to multi-user networks by using fitting curves to approximate the distribution of the ITCP. Next, based on the above observation, we present a new spectrum hole prediction model for the IEEE 802.11 standards based cognitive radio (CR) local areas...
In offshore hydrocarbon explorations, both the magnetotelluric (MT) method and the controlled-source electromagnetic (CSEM) method have been widely used. The MT method uses the electromagnetic fields due to natural sources that can be modeled by using plane waves. It has a relatively large depth of investigation and can be effectively used to obtain rough conductivity estimate of the subsurface. On...
In deep submicron process, parametric yield loss due to process variations has become a critical issue, especially for sensitive analog circuits. Design centering is one of the popular techniques to find the nominal design that leads to the maximum yield. However, in critical cases, it is possible that some parts of the performance distribution are still outside the feasible region and has no way...
This paper presents a new approach to the problem of system decomposition in a power system state estimation problem. The complexity of power systems is growing thus challenging the way measurements for state estimation are traditionally managed. Following a previous experience in defining a decentralized solution for state estimation, the authors here propose a procedure to automatically identify...
Background traffic has a significant impact on the behavior of network services and protocols. However, a detailed model of the background traffic can be extremely time consuming in simulation. In this paper, we extend our previous hybrid model that combines fluid and packet-oriented characterization of network traffic for a realistic representation of the background traffic on Internet. In particular,...
Thermal interface materials have been widely adopted in the thermal management for electronics system. Most of the thermal interface materials are made of polymers with thermally conductive particles distributed inside to enhance the thermal conductivity. Thus it is essential to figure out the effective thermal conductivity of this composite material. In the present paper, a parameterized cubic cell...
An elastic string-elastic shell model is developed to study vibration behaviors of a carbon nanowire. The present model predicts that non-coaxial vibration between the C-chain and the innermost tube does not occur due to negligible bending rigidity of the C-chain. In addition, it is found that the C-chain has most significant effect on the lowest frequency associated with radial vibration mode for...
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