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In this paper, a zero-voltage switching DC-AC inverter is designed and realized. The neutral point clamped topology and fix-frequency PWM control are used in the proposed inverter to implement a single-phase DC-AC inverter. Also, an auxiliary inductor and two auxiliary switches are adopted to achieve zero-voltage switching, which can improve the inverter efficiency. In this paper, the proposed DC-AC...
Developing an accurate activity recognition system with sensor readings is a challenging task due to the fact that sensors are subjected to a variety of errors and the nature of human activities is dynamic and uncertainties. Recent studies have shown that machine learning approaches can effectively classify human activities. In this study, we analyze sensor readings from accelerometers and gyroscopes...
A bidirectional interleaved forward-flyback DC-DC converter with leakage energy recycled is proposed in this paper. The proposed converter uses two transformers to reduce the current stress on the power components to reduce the conduction loss and improve the efficiency. When the proposed converter is operated in the step-up mode, the voltage across switches is clamped at the input voltage, and the...
In this paper, the characteristics of two different uniformly spaced circular arrays are analyzed, including the beam width, the sidelobe peak level, the resolution and the Cramer-Rao bound(CRB) of the array. Firstly, according to the structure of the dual circular array, the formula of array pattern, the formula of resolution and the formula of CRB are deduced. Secondly, the effects of the elements...
HBT effect of thermal light between different modes based on multi-mode interference is directly observed in a modified Michelson interferometer with orthogonal polarizations by a two-photon absorption detector at ultrashort timescale, which serves as a new unique tool for ultrafast quantum bunching distribution.
Research on activity recognition provides a wide range of ubiquitous computing applications. Once activities are recognized, computers can use this information to provide people with suitable services. In the past decade, many classification algorithms have been applied to activity recognition. However, most of them were based on the use of inertial measurement sensors, such as tri-axial accelerometers...
Frequency diverse array (FDA) is a kind of radar array who has an additional linear frequency increment across the array elements. Different from the conventional phased array whose steering beam is fixed at a certain angle for all ranges, FDA transmits range-dependent beampattern which contains both the angle and range information, making it resistant to point interference. This paper employs the...
With the health effects of radio fields (RF) concerned by public, many experiments exposed to RF in vivo and in vitro were studied, but some results were in the contradiction. Of all the possible reasons RF Uniformity might induce the contractions in experiments. In this paper, we proposes the Aperture-field method to evaluate field uniformity applying IEC published standard IEC 61000-40-20. The analysis...
In the present work, post-annealing modification in air was performed on the MoO3 films and its effect on the optoelectronic characteristics of organic light-emitting diodes (OLEDs) was investigated. When MoO3 was annealed at the proper temperature, the electroluminescent performances of OLEDs were improved. X-ray photoelectron spectroscopy (XPS) and Raman studies revealed that the air annealing process...
The paper was designed to investigate and compare the learning performance between the computer supported cooperative learning pedagogy in NetGuru network experimental platform with normal assignments and the computer supported personalized learning pedagogy in TAoD network experiment platform with IP-oriented template based assignments (IPOTAs). The target participants are the junior students enrolled...
High interactivity between human beings and the things that they use in their daily lives has resulted in the development of the Internet of Everything (IoE). While this user-centric paradigm requires a new software design philosophy, it is anticipated that incremental refinement software and its consistent interface will replace traditional software. This paper proposes a user-centric gateway and...
It appears that major travel agencies in Taiwan have already put elder people's traveling needs into consideration by including a “Senior-limited” section on their Web sites. However, the issue will be the practicalness and effectiveness of the design. Based on a recent survey, over 90% prefer to plan trips by themselves, the results showed that the practicalness and effectiveness of the current design...
Hand gestures are tools for conveying information, expressing emotion, interacting with electronic devices or even serving disabled people as a second language. A gesture can be recognized by capturing the movement of the hand, in real time, and classifying the collected data. Several commercial products such as Microsoft Kinect, Leap Motion Sensor, Synertial Gloves and HTC Vive have been released...
ISAR imaging of high speed moving target has drawn extensive attention for its practical applications. However, the imaging quality is affected significantly by the phase modulation induced by high speed motion. To suppress the influences of high speed motion efficiently, a novel ISAR imaging method for high speed moving target based on the parametric sparse representation is proposed. First, the...
Here we report an active microresonator by integrating a thin layer of all-inorganic CsPbBr3 nanocrystals (NCs) to a silica microsphere. We also demonstrate the transition from spontaneous emission to stimulated emission (SE) of CsPbBr3 with varying pump power. Further lasing is expected by improving the fabrication technology. Our configuration may provide a route to low threshold and compact lasers,...
In view of the extended target tracking with irregular shape, this paper proposes an adaptive contour algorithm based on star-convex Random Hypersurface Model. First, considering the unknown priori shape target with irregular extent, the adaptive contour method is proposed based on center contour distance. Then, on the basis of contour extraction method, we put forward a shape change detection method...
In consideration of the sensor control under the real tracking environment, this paper presents a threat assessment based sensor control. First, the factors that affect the threat level of target are analyzed. Moreover, this paper uses the approximate multi-target filter to estimate multi-target states, and determine the target with the maximum threat degree at the different times based on the Tactical...
In the era of big data, the available information on the Internet has overwhelmed the human processing capabilities in some commercial applications. Recommendation techniques are indispensable to predict user ratings on items in terms of historical data and deal with the information overload. In many applications, the problem of data sparsity usually results in overfitting and fails to give desirable...
Scattering mediums in atmosphere always leads to the decrease of imaging quality and performance in remote sensing, especially in Geological Surveying and Mapping, and also in Military Reconnaissance. So it's necessary to propose some methods to improve imaging quality. Here our primary results show that it's possible to measure medium's scattering property with adaptive algorithm through focusing,...
Motivated by the elegant structure of the cluster states, we design an ingenious quantum blind dual-signature scheme, which is implemented by the way of measurement on the cluster sates and can solve some secure information problems between the consumers, merchants, and banks in electronic transaction. In this paper, the initial phase, the signing phase and the verification phase are included. In...
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