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Reconfigurable radio frequency (RF) system has recently emerged as a promising solution to cope with multiple communication standards and high spectrum density. In this paper, we propose a novel optimization framework to efficiently program a reconfigurable RF system. In particular, two novel techniques, including (i) search space reduction by adaptive resolution and (ii) global polynomial optimization...
Opioid (e.g., heroin and morphine) addiction has become one of the largest and deadliest epidemics in the United States. To combat such deadly epidemic, there is an urgent need for novel tools and methodologies to gain new insights into the behavioral processes of opioid addiction and treatment. In this paper, we design and develop an intelligent system named iOPU to automate the detection of opioid...
We describe a novel methodology to validate vision-based autonomous driving systems over different circuit corners with consideration of temperature variation and circuit aging. The proposed work is motivated by the fact that low-level circuit implementation may have a significant impact on system performance, even though such effects have not been appropriately taken into account today. Our approach...
By investigating the current situation of university library's digital and informational development, this paper analyzes the opportunities and challenges brought by cloud computing technology to the development of libraries. Two strategies of renting cloud services and building cloud platform are put forward to realize the cloud computing service of Digital Library in big data environment.
Because of the crisis of unexpected events, data sources are complex and diverse. The application of the phrase weight measurement technique and the network user free marking technology in large data technology, transform the multimodal crisis information into a single information source, An integrated model for the extraction of crisis information was established. The integrative course includes...
With the development of offshore wind power generation, large-capacity medium-voltage wind turbine becomes the development trend. In this paper, the cascaded multi-cell topology with four-quadrant operation capacity is applied to medium-voltage wind power converters, which consist of a large number of switching devices, so it is essential to improve the converter's fault-tolerant ability. Once the...
This paper presents the design, development, and evaluation of a high power, i.e., 1200-V/600-A, double-sided multichip phase-leg IGBT module with the purpose of increasing power density compared with conventional wire-bonded IGBT modules. Nanosilver paste is chosen as the die-attach material so as to increase the maximum application temperature by avoiding the creep failure at high temperatures compared...
Low-temperature silver sintering technology, which has been proven to be a promising die-attach solution, was extended to bonding large substrates. Strong bonding strengths for substrates greater than 25 mm × 50 mm were achieved by sintering a nanosilver paste at temperatures below 270°C with less than 5 MPa pressure. To characterize thermal performance of the substrate-attach interface, we applied...
Transformer-less single-phase grid-tied inverter is attractive due to low cost, high efficiency, and small size. However, leakage current and second-order ripple power have to be well dealt with. Because the leakage current is a potential threat for body safety and the ripple power will decrease overall efficiency and system reliability. Both issues become obstacles for practical applications. This...
In this paper, we demonstrate a photonic wireless-communication device based on GaN-on-silicon platform with membrane light emitting diodes for in-plane ultra-short distance visible light communication (VLC). We utilize two bidirectional InGaN/GaN multiple-quantum-well devices integrated on one chip as signal emitter and receiver, which are operated under light-emitting diode (LED) or photo detector...
A predictive control scheme for the third-harmonic injection two-stage matrix converter (3TSMC) under unbalanced input voltages is presented. The proposed scheme is designed to predict the future behavior of the third-harmonic injection current and load currents respectively for each valid switching state. The control scheme selects the state that minimizes the error between the predicted currents...
Basin-type insulators are major insulating components in GIS (Gas Insulated Switchgear), and have significant influence on the performance and reliability of the equipment. The basin-type insulators are mainly manufactured through epoxy resin vacuum-casting process. As “ceramic-like” materials, epoxy resin would bring internal stress during the curing process. The failure mechanism of this kind of...
Well logging technology is of great significance to oil production. A new lateral resistivity logging-while-drilling (LWD) method applied in oil-based drilling fluid condition is proposed in this paper by combining capacitive coupling with inductive coupling principle. By using a new logging model, the ineffectiveness of the conventional resistivity LWD methods in oil-based drilling fluid is overcome...
Video scene parsing is challenging due to the following two reasons: firstly, it is non-trivial to learn meaningful video representations for producing the temporally consistent labeling map; secondly, such a learning process becomes more difficult with insufficient labeled video training data. In this work, we propose a unified framework to address the above two problems, which is to our knowledge...
Activity recognition has become an important function in many emerging computer vision applications e.g. automatic video surveillance system, human-computer interaction application, and video recommendation system, etc. In this paper, we propose a novel semantics based group activity recognition scheme, namely SBGAR, which achieves higher accuracy and efficiency than existing group activity recognition...
With the increasing penetration of distribution generations (DGs), the stability problems of the power system become more and more serious. Virtual synchronous generator (VSG) as an effective solution, can improve the converter inertia, but there is still possibility of power oscillation due to the small line impendence ratio R/X. In this paper, a small signal dynamic model is derived for the second-order...
Closing gaps in draft genomes is an important post processing step in genome assembly. At present, most assembled genomes contain gaps. Usually, genomes assembled from short reads or hybrid (with both short and long reads) have much more gaps than genomes assembled purely from long reads (with high coverage). A more complete genome is highly desirable since it leads to better annotation, less genotyping...
Outsourcing middleboxes brings threats to the enterprise's private information including the trafflc and rules of middleboxes. We present a secure and dynamic middlebox outsourcing framework SICS, short for Secure In-Cloud Service. SICS encrypts each packet header and uses a label for in-cloud rule matching, which enables the cloud to perform its functionalities correctly with minimum header information...
High-performance processors utilize embedded thermal sensors to continuously monitor the temperature of the chip during runtime. However, the overheating locations change temporally and spatially, depending on the various workloads running on the chip. Moreover, on-chip thermal sensor readings are highly affected by noise due to fabrication variations and randomness, which make the task of thermal...
It is one of the common tasks of machine vision defect detection to judge whether the resistance of PCB board is correct or not. The traditional detection method is to use the color industrial camera to take pictures, then transform the image from the RGB color model to the HSI / HSV color model, according to different colors in the new color space have different characteristics to split it out. However,...
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