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We proposed a motion segmentation method a few months ago. The problem of it is that the contour of the object segmented from the image sequence is always unclosed. This paper presents a method of the Gradient Vector Flow (GVF) field snake to close the contour. The initial curve of the GVF snake is rectangle, so that the curve can be used in the tracking and recognition applications. However, corners...
Virtualization technology and MapReduce program model are sharp swords for the big data and cloud computing era. The combination of them exhibits powerful ability of easy-management, fast-deployment, feasible-scalability and high-efficiency. However, the downside is that the performance is limited by the I/O bottleneck of Virtual Machine(VM). A huge number of data should be handled in MapReduce cluster...
MapReduce is an emerging program model in large-scale parallel applications while virtual machine environments are basic computing units in cloud computing. With advantages of these two rising technologies, we can build up a convenient parallel programming environment and make effective use of system resources in cloud computing. In this paper, we describe the effects of different virtualization technologies...
Cache is an important component existing in modern computer system to bridge the performance gap between the fast CPU and the slow memory system. A variety of cache optimization technologies and mechanisms are proposed to improve the cache performance, such as instruction cache prefetching. Most instruction prefetching mechanisms existing are proposed to improve the average-case cache performance...
In many applications of digital signal processing, signal characteristics could change. This requires the utilization of adaptive filters. The Recursive Least Squares (RLS) algorithm has established itself as the best adaptive filtering algorithm, but practical implementations of the algorithm are often associated with high computational complexity. Recently, Recursive Adaptive Matching Pursuit (RAMP)...
In GSM digital mobile communications networks, co-channel interference (CCI) is the limiting factor for system capacity. In the downlink of the system, single antenna interference cancellation (SAIC) techniques should be used, because only one receive antenna is available at the mobile terminal. In this paper, we introduce a SAIC CCI canceling method by treating the real and imaginary parts of the...
Multi-core virtualization platform is an essential basement of modern computing environment including server consolidation and cloud computing. However hidden contention for physical resources between different workloads always causes serious performance interference and thus reduces system performance and efficiency. In order to address this issue, we exploit the possibility of scheduling virtual...
Due to the stability and flexibility, the MIL-STD-1553 Bus (1553B) has been widely used in the modern military avionics systems. The modeling and simulation are the effective and straightforward methods to evaluate a specific 1553B topology. In this paper, a frequency domain distortion prediction modeling method, which can be used to evaluate the channel attenuation of the 1553B system efficiently...
In virtualized HPC system such as virtual cluster and science cloud, CPU-intensive jobs are always companied by high-intensive I/O operations since different computing nodes perform periodic inter-VM communication to transfer data or synchronize computing result. Since traditional VMM schedulers cannot handle the scheduling scenario with mixed workloads efficiently, inter-VM communication always suffers...
Clinical studies have indicated that some diseases such as insomnia, anxiety, and minor melancholia all have close correlation with autonomic nervous system. The respiratory training can regulate the function of human autonomic nervous system and consequently release stress. We design a respiratory training biofeedback system which trains the subjects to perform pursed lips abdominal breathing and...
High rectangle factor has been one of the most impressive characters of SAW filter, especially low-loss SAW filters used in recent years. Many experts dedicated to this kind of research and obtained some excellent results, many improvements were promoted as well. This paper starts form frequency dependent COM parameters extraction method, discussing the pitch-modulated IDTs and reflectors structure...
In safety critical area, even the slightest error of the operating system could lead to a significant property damage or casualties. As a result, the safety of the RTOS (Real Time Operating System) must be improved. Rushby etc. have done lots of research on safety kernel. Multi-core processor is developing rapidly. This paper presents that the safety of real time system can be improved with a multi-core...
Mobile applications are becoming more and more popular with the prevalence of mobile operating system and mobile Internet. However, the bugs in the mobile application not only results from buggy code but also from unreliable context providers. In this paper, we proposed a statistical fault localization framework targeting at the bugs in the mobile application, especially the buggy context provider...
In the area of system architecture, there are two most significant trends: multi-core and system virtualization technology. Both of them have quite close relationship with energy efficient computing. Industry turns to integrate more cores on a single chip instead of increasing frequency to solve the heat problem. Meanwhile system virtualization could decrease the total power consumption by sharing...
On basis of Coupling of Modes (COM) model, the field distribution within short-circuited grating and open-circuited grating is studied. The behavior of forward and backward surface acoustic waves among the gratings can be easily explained by the action of the reflection coefficient and the propagation of the wave in a media without reflection. So according to the parameters of the distribution curves...
Spectral clustering is a powerful technique in data analysis. We extend the spectral clustering method to point cloud segmentation. By connecting each point with its neighbors and assigning the edge a weight that describes the similarity, the point cloud can be represented as a graph. Then segmentation problem can be turned into a graph min-cut problem, which is NP hard. If we cut this graph into...
We present the design of time parallel trace-driven cache simulation for the purpose of evaluating different cache architectures. Due to the long simulation cycles, traditional sequential simulation methods are no longer practical. An obvious way to achieve fast parallel simulation is time parallel. It splits the whole trace into small slices which are assigned to parallel processors for concurrent...
Physic-based fluid simulation is used extensively nowadays; however the traditional serial algorithm can't satisfy the real-time requirement due to its complexity and computeintensive. The development of modern GPU makes this possible. In this paper, a Smoothed Particle Hydrodynamics (SPH) method for incompressible fluid was implemented using CUDA on GPU. Since the algorithm was executed on the GPU...
The vehicle shadow's detection and elimination work basically for extracting and tracking the vehicle characteristics, and it also plays a very important role in highway video surveillance and incident detection, affecting the post-processing of video image directly, such as vehicle tracking and speed measurement. On study of Kimmel variational and multi-scale Retinex algorithm to eliminate the vehicle...
In terms of the high frequency of mis-match of SIFT method under the strong disturb and complex background, this paper proposes a new matching method based on comparing modulus. According to this method, the eigenvector limit is required at first before the normalization processing, and then, accurate matching pairs between two pictures can be found according to the difference between the modulus...
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