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As the virtual reality is famous with its immersion, it makes journalism a promising application of 360 videos. However, the key factors of VR videos, such as interaction, framing, stitching, etc., differ greatly from that of what they used to be, it appears that storytelling is getting much more difficult than before. To deal with the problem, we analyze the New York Times 360 videos, a pioneer in...
The effects of Diethyl aminoethyl hexanoate (DAH) on one-step micro-propagation culture with leave, petiole, and root explants were investigated. It was found that adding DAH into basic media increased the one-step culture rates from about less than 40% to more than 50%. For leaf explants, the optimum DAH concentration is 0.08 mg·L-1; petiole, 0.32 mg·L-1, and root explant,...
Considering the high precision and small load of the 3D printer motion control system, this paper proposed a method of multi-dimensional stepper motor coordinated control. The overall design of the control system is given; based on Bresenham algorithm, the Bresenham algorithm is extended from two-dimensional to multidimensional, realizing cooperative movement of the multidimensional stepper motor;...
Cu to Cu bonding technology of IC package has the potential to replace solder joint in Future trends. The Cu to Cu bonding technology compared with other joint methods for IC package, it can solve the reliability problems such as electromigration, brittle intermetallic compound or other issues. At present, Cu to Cu bonding methods have been wide developed, but the microcosmic mechanisms of Cu to Cu...
For the specific propagation characteristics of millimeter wave, in this paper, we study the beamforming design and interference management in millimeter wave cellular networks with partial channel state information (CSI). Specifically, we propose two beamforming schemes, namely eigen beamforming and orthogonal beamforming, based on the information of channel covariance matrix, and analyze the intercell...
In this paper, we improve the direction finding accuracy for shortwave fixed stations located in imperfect environment. A correction method of direction finding data is proposed based on least square algorithm. Firstly, we establish the mathematical model of the relationship between real azimuthal angles and errors according to the statistical features of direction finding data. Then we design model...
Target identification has drawn lots of attentions in remote sensing and radar applications. Among various algorithms, the polarimetric entropy is a powerful means to discriminate between different targets. This paper begins with a brief review of polarimetric entropy and its formulation. Then, we discuss the formulas qualitatively, and based on the discussion, we propose a criterion for radar antenna...
This paper presents a 143GHz power amplifier using eight-path power combiner in a 65nm CMOS. The Over neutralization technique is proposed to boost the gain of a differential pair without extra penalty on power consumption. A four-stage PA achieves a maximum gain of 17.3dB at 143GHz with a 3dB bandwidth of 4GHz. Based on the eight-path power combining technology, it delivers up to 13.2dBm saturated...
Energy storage system (ESS) are playing a more important role in renewable energy integration, especially in micro grid system. In this paper, the integrated scheme of energy storage system is designed. And a demonstration project of 1MWh energy storage power station which was accessed to a photovoltaic system was built. The structure of the storage system was given. Two control strategies of the...
In this paper, Ti-doped GaZnO (GTZO) quaternary alloys were used as the transparent conductive oxides (TCOs) for Cu(In, Ga)SeSe2 (CIGS) solar cell application. These thin films are highly favorable for solar power systems. Photoluminescence measurement and X-ray diffraction were employed to investigate the GTZO thin films. Advantageous crystal quality was produced by radio-frequency magnetron sputtering...
A low-profile polarization-reconfigurable cavity antenna for use on the US/Taiwan UHF RFID band (902–928 MHz) is presented. The whole structure is formed by a partially reflective surface (PRS) atop a one-wavelength square slot loop as its radiating source. Thanks to the PRS, the cavity antenna radiates uni-directionally with a stable gain of 6 dBic and a low profile. The square slot loop is dual...
Harmonics are commonly encountered in the unbalanced three-phase power system. They can cause oscillation of the nominal frequency, which damages the stability of the electrical system. In this paper, an adaptive batch-mode frequency estimator is devised to monitor this variation. After converting the three-phase waveforms into a complex-valued signal via αβ-transformation, a high-resolution spectral...
Selecting facial feature regions of interest (ROIs), together with the ensuing image analysis, allows for the extraction of diverse facial feature information, and is a common strategy for face recognition. However, the traditional facial feature ROIs must often be hand-selected or automatically detected using prior knowledge. This study proposes to project pixel information from the eyes and mouth...
A dual-band broadside linear slot antenna array with corporate-series-feed based on composite right-/left-handed (CRLH) microstrip line (MSL) sections is proposed. It consists of dual-band slot antenna elements, a T-junction, and two CRLH MSL sections. The antenna element is modified from [4]. The design formulas for the CRLH MSL section at the two desired frequencies are given. For verification,...
A novel beam-steerable dual-beam reflectarray antenna system is presented. It consists of hexagonal-shaped unit cells (UCs) arranged in a honeycomb lattice structure. Each UC is formed by a conductor-backed strip dipole loaded with a varactor diode for adaptively adjusting its reflection phase. To find the compensation phases for the UCs, a simple optimization algorithm is proposed and integrated...
To evaluate a multifunctional microcapsule for cartilage tissue engineering, we developed a brand new amphiphilic material grafting Hyaluronic acid (HA) on hexanoic anhydride modified gelatin. The material formed microcapsules (HA-AGMC) loaded with superparamagnetic iron oxide (SPIO) and TGF-β1 can stimulate chondrogenic differentiation by the combination of biochemical and biophysical stimulation.
Cardiac tissue engineering aims to reconstruct functional construction with resembling native tissue to replace damaged myocardium. To mimic native myocardium, cells with phenotypes of mature cardiomyocytes and scaffolds with elastic, electro-conductive, highly porous, and biodegradable plays two major roles. So far, although a number of cell types have been evaluated in the reports of cardiac repair,...
Inverters in back to back (B2B) connection are utilized to convert the voltage and frequency of the power source to another format. Typical application of inverters is the wind power system. This study presents a B2B inverter for equal voltage and frequency format conversion in which one inverter works to get power from the grid to charge the DC capacitor and another inverter returns most of the active...
In a recent study, we have shown that the mixtures of graphene oxide (GO) nanosheets and Pluronic F-127 (PLU) polymers (GO-PLU) exhibit superior antimicrobial activity compared to GO alone on physiologically naïve bacteria challenged with hypoosmotic stress, particularly on Gram-negative species. Further, we have more recently demonstrated that the antibacterial activity of GO (alone) is significantly...
Based on compressed-sensing (CS) technique, a channel estimation scheme OFDM system for double-selected channel is proposed in this work. The variation of each channel path is fitted using a polynomial instead of the Doppler spread model, where a more flexible assumption is allowed, and the sparsity required for the CS technique is still available since each can be characterized using few parameters...
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