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We construct a two-port non-Foster element with an unconventional use of a floating negative impedance convertor. Compared with one-port non-Foster elements, it is able to have a non-Foster transmission coefficient that can be used to compensate distortion of input signals due to nonlinear frequency response of Foster networks. Both theoretical and simulated analysis verified the effectiveness of...
This paper presents a new contrast enhancement method using Histogram Equalization named Dualistc Sub-Image and Non-parametric Modified Histogram Equalization (DSINMHE). Our proposed method consists of three steps: (i) The original image is segmented into two sub-images by the median value of the image. (ii) Then we use the histogram modification technique to maximize entropy and control over enhancement...
In this paper, we present a close-form expression for the downlink throughput of a massive MIMO system with finite antenna elements in a multi-celluar systems. In practice, the performance of massive MIMO system is limited by the number of antenna elements. From the operator aspect, the cost of massive MIMO is a major concern. Thus, a massive MIMO system with finite antenna elements is of interest...
This paper presents a new image enhancement method by histogram equalization called Brightness Preserving and Non-parametric Modified Bi-histogram Equalization (BPNMBHE). Our method consists of three steps: (i) The input original image is divided into two sub images using the average intensity value. (ii) We use the histogram modification technique to maximize entropy and control over enhancement...
Acquiring light field with larger angular resolution and higher spatial resolution in low cost is the goal of light field capture. Combining or modifying traditional optical cameras is a usual method for designing light field capture equipment, among which most models should deliberate trade-off between angular and spatial resolution, but augmenting coded aperture avoids this consideration by multiplexing...
Selecting a good, appropriate restaurant for an event is a common problem for most people. In addition to the main features of restaurants (e.g. food style, price, and taste), a good recommendation system should also consider diners' context information. Although there are many context-aware restaurant recommenders, most of them only focus on location information. This research aims to incorporate...
The low-frequency electromagnetic radiation of cabinet has became the main interference source for electromagnetic sensitive system. The feature of interference sources in cabinet was analyzed, and the electric dipole is considered as the equivalent interference source. Then, considering the low-frequency radiation characteristic, the low-frequency MoM is used to simulate the electromagnetic environment...
This paper investigates the pulsed fields waveform dependent characteristics of NEMP simulation. The termination impedance, the absorbing impedance of NEMP (nuclear electromagnetic pulse) simulator and the structures of simulator's influence on waveform of test region of NEMP simulator have investigate intensively. The conclusions of this paper can provide guidance to the design of NEMP simulator.
The basic structure and principle of data link communication system (DLCS) were introduced. And then the RS error-corrected coding/decoding and MSK modulation/ demodulation techniques were analyzed. The anti-noise performance of DLCS in Gaussian white noise channel was studied. Moreover a model of DLCS with RS coding/decoding was developed based on Simulink in Matlab. The simulation results were verified.
With the prevalence of digital signage, many organizations make attempt on adopting it as a practical channel which provides real time information or business promotions with customers, rather than using a traditional advertisement board. We examined the factor influencing adoption of digital signage in medium-sized enterprises in Taiwan and tested the hypothesized model for explaining their intentions...
In this study, a framework based on the theory of planned behavior was proposed to find out the major factors which could have influences on learners' knowledge sharing intentions. A field survey has been conducted with 150 learners who had experiences in web-based learning. The proposed hypotheses were examined by structural equation modeling. According to the analysis results, we have found that:...
The Photovoltaic Arrays has a best optimal operating point. When operating at this location, the array will be most efficient in the production of electricity. However, the optimal operating point can be compromised by the strength of solar radiation, angle, environment and fluctuations in workload. Due to the constant changes in these conditions, it has become very difficult to locate the optimal...
An improved Harris corner detection method is proposed based on B_spline. Since the inherent characteristic of the Harris corner detection algorithms theory, It has shortcomings such as this corner has large redundancy or some corner will lose and so on. However, B-spline has stronger convergence and well approaching to given function. So in the new method, the B_spline filter operator is used in...
According to the uncertainty of indexes in the bid evaluation of power equipment, the entropy value theory is applied to combine the traditional fuzzy comprehensive evaluation method for bid evaluation of power equipment. The coefficients of weight for evaluation factors are obtained from the avail value of data reflecting the information entropy. This method is applied for bid evaluation of power...
Geospatial tagging (geotagging) is an emerging and very promising application that can help users find a wide variety of location-specific information, and facilitate the development of future location-based services. Conventional geotagging systems share some limitations, such as the use of a two-phase operating model and the tendency to tag popular objects with simple contexts. To address these...
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