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Modular multilevel converter (MMC) has been a research hotspot in the past decade in the high-voltage high-power applications. The basic working principle is analyzed in depth in this paper firstly. A precise control law is deduced to control the output voltage and the circulating current directly and precisely. Different from the conventional control law, arm inductor voltages are considered in the...
The personalized recommendation system has been widely and maturely applied to various domains from social network to items recommendation such as videos, music, movies, books and online shopping. In the meantime, the information visualization technology based on big data has a substantial development. Considering the common based on big data, this paper discussed the connections of graph visualization...
Collaborative filtering is the most worldwide and personalized video recommendation technology. As collaborative filtering recommendation system is often faced with the problem of matrix sparse on user rating. Via the introduction of the concept of collaborative filtering and the analysis of user behaviors and solution to the problem of sparse existing recommendation systems, this paper puts forward...
X-ray in-line phase contrast computed tomography (PC-CT) can provide imaging contrast that is orders of magnitude better than conventional absorption-based CT and has attracted some interest in many fields such as life science, medicine and biomedical engineering. In conventional methods, PC-CT needs two rotation scans to retrieve the phase line integral projection from the recorded original data...
The study uses augmented reality (AR) technology to integrate virtual objects into the real learning environment for language learning. The English AR classroom is constructed using the system prototyping method and evaluated by semi-structured in-depth interviews. According to the flow theory by Csikszenmihalyi in 1975 along with the immersive factors from Trevino and Webster in 1992, the proposed...
We demonstrate high-performance THz QCLs lasing at 2.2, 2.53, 3.5 and 4.7 THz, which target absorption lines of water, methane, hydroxyl and atomic oxygen respectively. Reliable single-mode targeting of gas species is obtained through the use of a photonic lattice design. A highly reproducible micro-machined waveguide block yields narrow beam-divergence and enables future integration of a complete...
One of the key challenges in the software engineering lies in requirement engineering. As an important technique for modeling and analyzing requirements, software architecture has been intensively studied in recent years. Although various modeling tools have been proposed in both academy and industry, these tools typically provide limited support for analyzing non-functional requirements at architecture...
Ear has been proven to be a good candidate for non-contact recognition. In order to acquire ear's 3D information as well as reserve its non-contact advantage, 3D reconstruction using 2D images can be a promising way. However ear is a small object with abundant structure information, which makes the 3D shape estimating a challenge problem. An improved sophisticated 3D ear reconstruction method based...
We demonstrate an astro-comb for relatively low resolution astronomical spectrographs. The space of comb lines is Altered to 30 GHz by a Fabry-Perot cavity spaced by an ULE glass. The radial velocity precision is <40 cm/s.
This topic starting from the actual project, design a set of sea cucumber on the basis of quality grade automatic sorting equipment. Reference to the existing each kind of food electronic weighing type separator, a new form of research articles on sea cucumber processing of weighing separator, abandoned the PC control high cost and the disadvantages of single chip microcomputer control are susceptible...
The advanced laser technology has led to gigahertz level repetition rate femtosecond fiber laser possible. This laser offers advantages of high average power, chirp-free output pulses and helps the frequency comb made compact and simplified.
To ensure high reliability for large and complex software systems, fault tolerance mechanisms have been widely used in the system design processes. However, less attention has been paid to the analysis of the system reliability improvement concerning fault tolerance. Therefore, they might underestimate the system reliability. To remedy this, we extend architecture based reliability estimation to take...
In this paper, the high dynamic range and all-focus image is generated from light field. In the proposed high dynamic range light field, each light instead of an image point owns high dynamic range, and the light location and direction information is also preserved. Based on the fifth dimension information, exposure time, the response curve of light field is calibrated, and the real intensity level...
Informatization is the ultimate way out for audit method in China. In order to improve audit quality, the auditee's information system always needs to be restored on the auditors' environment by re-installing them. The kind of audit model brings great pressure to the auditors, not only is the heavy workload at each audit project, but also there is incompatibility problems between different operating...
According to the relationship of failure time between system and subsystems of CNC Bending Machine, a Monte Carlo simulation model is constituted. Considering reliability influencing factors, the factor weight is determined by fuzzy scoring and analytical hierarchy process. Comparing the relationship status of old CNC Bending Machine and new CNC Bending Machine, reliability growth coefficient is proposed...
The development of the joule balance method to measure the Planck constant, in support of the redefinition of the kilogram, has been going on at the National Institute of Metrology of China (NIM) since 2007. The first prototype has been built to check the feasibility of the principle. In 2011, the relative uncertainty of the Planck constant measurement at NIM is $7.7\times 10^{-5}$ . Self-heating...
This paper establishes a three-layer consumer involvement model for the customers of the Facebook Fan Page of a fashion brand. A series of data mining methodology is proposed, such as data clustering, correlation coefficient and linear regression. To describe three consumer involvements, including advertisement involvement, activity involvement and product involvement, each layer designs a corresponding...
The purpose of this study is to discuss the influence of knowledge-sharing to competitive strength of elementary schools in Taichung County, and the information is gained by way of a random sample of 89 elementary schools in Taichung County. The examinees are directed against the administrative management among these 89 elementary schools. After collecting the analyzing the collected information,...
We present a method for simulating makeup in a face image. To generate realistic results without detailed geometric and reflectance measurements of the user, we propose to separate the image into intrinsic image layers and alter them according to proposed adaptations of physically-based reflectance models. Through this layer manipulation, the measured properties of cosmetic products are applied while...
As the size and complexity of the designs grows larger, Field Programmable Gate Array (FPGA) based design solutions are becoming more dominant in system designs due to their ability to offer higher logic capacity and more on chip resources. FPGA based design solutions that offer higher capacity and higher bandwidth with low latency and power can provide system level functionality similar to Application...
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