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Indium-tin-oxide (ITO) films are widely applied as the transparent conductive layers in light emitting diodes and solar cells. In this paper, ITO nanowiskers have been obtained by controlling the oxygen flow in the process of evaporation by electron-beam evaporation technique. ITO nanowiskers appeared for specific vapor-liquid-solid (VLS) growth conditions in the process. Nanowisker ITO films were...
Though current workflow systems, known as the major task managing tool in data-center, use UNIX-based user/group authorization mechanisms to defend unauthorized operations, the information in workflow systems, such as DAG (Directed Acyclic Graph), could be easily exposed to any user-level malicious monitor. In this paper, we propose a type of side channel attack to data-center workflow information...
The growing availability of sensors integrated in smartphones provides much more opportunities for context-aware services, such as location-based and profile-based applications. Power consumption of the sensors contributes a significant part of the overall power consumption on current smartphones. Furthermore, smartphone sensors have to be activated in a stable period to match to the request frequency...
GPU can offer more powerful computing capabilities compared to that of the CPU, but the problem of the energy consumption is particularly prominent and affects its application in a broader filed. In solving this problem, DVFS (Dynamic Voltage Frequency Scaling) becomes an effective solution. The previous works use the linear approaches and ignore other component characteristics in system at software...
Saving energy is an imperative problem in the design and operation of robotic fish swarm because each fish has limited power source and cannot be conveniently replaced in aquatic environment. A novel method is proposed for energy conservation. This is to make use of cluster structure to group the fish into clusters. Therefore, it is essential to elect part of robotic fish swarm to turn into cluster...
One of the most important work to analyze networks is community detection. We present a dynamic community discovery method based on Visibility Graph. Firstly, we put forward related definitions of Visibility Graph for multi-dimensional time series. Then, we present algorithms to describe how to use Visibility Graph in finding communities in complex networks. Finally, we present algorithms to find...
Task assignment is one of the essential steps to enhance the cooperation of robotic fish sensor network effectively. Meanwhile, reasonable task assignment also improves the lifetime of the whole network due to the fact that robotic fish are battery-operated. Therefore, a new energy-saving task assignment method is proposed based on artificial fish swarm algorithm. First, the modeling of energy consumption...
A Zeonex hollow-core terahertz fiber was developed successfully. The lowest loss is 1dB/m at the frequency below 1THz, which is much lower than THz fibers reported. The loss is still below 5dB/m when it's bent.
ZFS file system has been widely used as it provides a file system interface and a block device interface. ZFS ignores the workload features of sequential writes. Writes to a block device with an unaligned I/O pattern will cause inefficient "read-modify-write" operations. In this paper, we propose an approach, called Fwrite, to optimize write performance of ZFS on Linux. This approach merges...
Runtime verification is a dynamic verification technique widely used in practice. In this paper we revisit the runtime verification technique with formula progression, which verifies the execution trace step by step by progressing the desired property written in temporal logic. The previous work did not discuss explicitly the bound for the sizes of expanded formulas, while the successive invoking...
Considering the lower accuracy of existing traffic sign recognition methods, a new traffic sign recognition method using histogram of oriented gradient - support vector machine (HOG-SVM) and grid search (GS) is proposed. First, the histogram of oriented gradient (HOG) is used to extract the characteristics of traffic sign. Then the grid search technique is applied to optimize the parameters of support...
Semantic Web offers many possibilities for future Web technologies. Therefore, it is a need to search for ways that can bring the huge amount of unstructured documents from current Web to Semantic Web automatically. One big challenge in searching for such ways is how to understand patterns by both humans and machine. To address this issue, we present an innovative model which interprets patterns to...
In order to improve the image analysis ability in some practical applications, an image fusion algorithm was proposed. This algorithm combined information from multiple images of the same scene in pixel level. Firstly, a group of lifting morphological wavelets for image fusion was discussed. Then using one of the schemes, multiple images were shift in different direction and decomposed respectively...
Mo nanowalls with high and stable field emission properties have been synthesized by a thermal vapor deposition method, and it shows strong immunity to the in situ oxidizing environment. After pure O2 exposure, the degradation of emission current was only 42.31% when the vacuum pressure increased from 2×10−6 Pa to 5×10−4 Pa. For those exposures over 1×10−3 Pa, the cathode's total recover was still...
This article is based on the correlation of FFT(Fast Fourier Transform) to study the ultrasonic TOFD(Time Of Flight Diffraction) image registration algorithm and according to the principle of template matching algorithm, the process is simple and the registration locations are accurate, so that the detected images are clear and defected features are obvious. The subsequent sub-pixel image registration...
The ITO film as the transparent conductive layer in gallium nitride based light emitting diodes (LEDs) can improve effectively current spreading and is widely applied. In this paper, ITO films with different morphologies have been obtained through different evaporation conditions. By adjusting oxygen flow in the process of evaporation, nanorod, cellular particle and grain cluster ITO structures had...
Total internal reflection (TIR) effect leads to low light extraction efficiency (LEE) of the GaN LEDs on SiC and sapphire substrates. The LEE enhancements of the GaN based flip-chip light-emitting diodes (FC-LEDs) on patterned substrates are investigated by experiments and simulations. The optical output power of the FC-LEDs on patterned SiC substrate increases by 8.15% while the optical output power...
We report on the effects of post-annealing on ZnO nanorods array using optical second harmonic generation (SHG). The high-quality and nearly vertically aligned ZnO nanorod arrays were deposited on ZnO-seeded glass substrates by aqueous solution method. The SHG result indicated the transformation of oxygen deficiency on ZnO nanorods surface after post-annealing treatment process. The chemical composition...
The function of power divider is to divide to power from one input port into the divided power at multiple output ports, or to combine the power from multiple ports into the combined power at one output port. The goal of this study is to design a millimeter-wave power divider operating at the range from 32 GHz to 34 GHz. The return loss at each port and the isolation between from output ports are...
Finding and labelling semantic features patterns of documents in a large, spatial corpus is a challenging problem. Text documents have characteristics that make semantic labelling difficult, the rapidly increasing volume of online documents makes a bottleneck in finding meaningful textual patterns. Aiming to deal with these issues, we propose an unsupervised documnent labelling approach based on semantic...
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