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The authors propose a variational level set image segmentation method for intensity inhomogeneous texture image. The method first extracts the main image structure by a relative total variation image decomposition method, which can better decompose the image into structural and textural parts. Then only uses the structural part as the input image for the variational level set segmentation. The intensity...
In this paper, a novel and small sub-terahertz (THz) sheet beam extended interaction klystron (EIK) has been designed. With the help of a three-dimensional(3D) particle-in-cell(PIC) simulation, design and optimizing geometry of THz sheet beam EIK is performed. The interaction system consists of two dumbbell five-gap cavities, one is used for input cavity, the other is output cavity. The operating...
Small batch customization becomes an important typical manufacturing model nowadays. Considering the limited machine and technic resource in small scale factory, it's crucial for them to schedule mutable producing task. By analyzing flexible job shop scheduling problem, setting up mathematical models and objective functions, the flexible job shop dynamic scheduling problems can be solved, under the...
With the ever increasing demand on interactive data analytics, latency for big data frameworks becomes more important. We present our preliminary experience designing and implementing NetSpark, an improved Spark [1] framework that is highly optimized for network latency. Combining optimizations on data serialization, network buffer management with hardware-supported Remote Direct Memory Access (RDMA)...
The copper grain growth, Rs (Square Resistance) and CMP (Chemical Mechanical Polishing) removal rate of copper film with self-anneal and high-temperature anneal (HTA) conditions were quantitatively studied. The Rs value decreased with the increase of big grain percentage. And CMP removal rate of self-anneal copper film became faster due to the growth of copper grain. After 72 hours of self-anneal,...
In this study, roughened Ni/Pd/Au-Ag alloy-plated Cu leadframe and two types of mold compounds (A and B) were studied in terms of button shear tests on the leadframe surfaces and package performance after assembly and after reliability stresses. The package reliability stresses include pre-conditioning at Moisture Sensitivity Level 3 (MSL3) with three cycles of reflow at 260 °C (peak temperature)...
Forest stands classification is the precondition of stand inventory and forest management. It is also the primary task and main content of the inventory and dynamic monitoring of forest resources. With the improvements of the spatial resolution of remotely sensed image and the development of GEOgraphic Object-Based Image Analysis (GEOBIA) technologies, the precision of stand division had increased...
This paper studies the image fusion algorithm of edge corrosion on large thickness difference titanium alloy with DR detection. First collected the DR digital image of large thickness difference workpiece, then calculated the edge width of image with ImageJ, and finally handled with edge corrosion area through the image fusion technology of PCNN. The information of fused image was more wealth than...
Wireless indoor localization is crucial in ubiquitous computing environments. Although accurate and efficient indoor localization can be provided in dense wireless networks, most existing algorithms fail to locate a mobile user in sparse deployment networks. In order to address this issue, this paper presents a new fingerprinting localization algorithm based on cost function where received signal...
Microwave tubes are vacuum electron devices used for the generation and amplification of radio frequencies in the microwave frequency range. Klystron is a kind of microwave tubes which is used in radar. A sheet-beam Extended Interaction Klystron (SBEIK) is an attractive MMW amplifier because of its high gain per unit length and compact configuration. The RF structure is an important part of the whole...
This paper presents a study on edge effect of radiographic inspection for Titanium alloy joint structure with large thickness difference. And due to the existence of the defects undetected caused by edge effect in practical situation, it is significant to investigate the impact of edge effect on radiographic examination of joint structure with such a large difference in thickness. The conventional...
We experimentally demonstrate that polarization difference ghost imaging can provide the visibility and contrast enhancement, especially when the target is under predominately reflecting objects, complex background or turbid media. It facilitates the practical applications of ghost imaging.
This paper studies the challenges and behavior of epoxy material between the silicon (Si) material and roughened Ni/Pd/Au-Ag alloy-plated Copper (Cu) leadframe (known as μPPF) with anti-epoxy bleed-out (EBO) during die bond process. Die bond on die attach paddle (DAP) of roughened μPPF using Silver (Ag)-based epoxy has been a challenge for its manufacturability in terms of maintaining the target epoxy...
Multi-class imbalanced data classification problem is common in the real world, but traditional binary classification methods cannot be directly applied. Existing solutions include designing new multi-class classification algorithm and dividing multi-class classification problem into binary classification problem. The latter includes two widely used strategies, namely one versus all (OVA) and one...
The clutch control in the starting process is a main core and difficulty of control technology of dual clutch transmission(DCT). Without a hydraulic torque converter, the DCT achieves a smooth start only by the slipping of clutches and the DCT slipping control in the starting process becomes a key point. The torque transfer characteristics of the wet clutch is very complex and affected by many factors...
This paper proposed a hybrid multi-terminal HVDC (MTDC) system to integrate several distributed offshore wind farms to onshore power grids. And a comprehensive frequency support algorithm for onshore grid was designed. The configuration and operation principles of a typical 4 terminals system are described. A system control strategies are proposed for both wind farm side VSCs (WFVSCs) and grid side...
Multi-core or many-core machines become increasingly pervasive. Parallel simulation can achieve high efficiency by employing multi-threaded parallel execution of models and fast inter-thread communication between models. However, load imbalance among cores degrades performance of the simulation system greatly. This is especially true for simulation of variable structure systems, due to dynamic addition...
The popularity of the modeling and simulation application increases the demand for acquiring the service of the simulation resource and capability (R/C) anytime, anywhere, on demand through the network. Cloud simulation draws the idea of cloud computing that integrates and shares the R/Cs to provide services which significantly depending on the R/Cs' management. Most existing work assumes that there...
The back propagation(BP) neural network is widely used for text categorization and could achieve high performance. However, the greatest disadvantage of this network is its long training time. The genetic algorithm is often used to generate useful solutions for optimization. In this paper we combined the genetic algorithm and the back propagation neural network for text categorization. We use the...
We demonstrate an experiment of imaging through strongly scattering layers based on period diffraction correlation imaging. The implementation of this experiment is quite simple. This technique could find applications in imaging biological tissues.
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