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Probability-based clipping of full parallel 128-point FFTs is proposed, which offers 3-bit resolution reductions of FFT and achieves 28% logic resource usage reduction and highly accurate stage-dependent bit resolution maps. Results are verified over FPGA-based Coherent Optical OFDM transmission systems.
The hardware system of ternary optical computer (TOC) is becoming increasingly complete. In order to facilitate the use of this new type of computer under the user programming, all the differences between this computer and traditional electric processor are shielded by using the file called "Computing-Data File". Thus a cooperative processing model between two types of computer can be formed...
Traditionally resource utilization on physical servers in cloud data center is uncertain. On one hand, resources will be wasted if the assignment of tasks are not enough. On the other hand it will cause overload if the assignment of tasks are too much. This is especially obvious when the applications are the same type. To solve this issue and considering CPU intensive application is one of the most...
An I/O intensive application is one of the most common applications in cloud computing, which is a dominant type in some occasions. However, few studies have focused on how to improve the processing efficiency of such specific type of applications. We have found out the performance bottlenecks based on the features obtained from I/O-intensive applications. By analyzing the features of files, we put...
Energy consumption is very important to cloud data centers, as it takes a large quotient of the operation cost much related to the environment. To decrease the energy consumption in cloud data center, one possible solution is processing different types of applications in clouds with different strategies. However, to reach this goal, the prime question to be solved is how to effectively classify the...
CPU-intensive application is one of the most commonly used application types in cloud computing. In order to effectively deal with CPU-intensive applications and improve the application efficiency of cloud computing, we researched on CPU-intensive applications. Through this study, we find some common features and characteristics of this kind of applications. Based on these characteristics, we establish...
I/O intensive application is one of the most common applications in cloud computing environment. In some occasions, it is even the dominant type. However, few studies have focused on how to improve the processing efficiency of such specific type of application. To efficiently use I/O intensive application, it is important to find out the features and characteristics of this application. In this paper,...
Based on the screw product exponentials formula and space Jacobi matrix, a general iterative algorithm on inverse kinematics is proposed for humanoid upper body system. First the screw coordinate is built for the system and forward kinematics equation is established. Then the inverse kinematics problem of the system is solved based on the Newton-Raphson iterative method. The results of numerical simulations...
How to fully apply the characteristics and advantages of light in numerical computation is an important issue that attracts many scholars. Though much research has been done in this field, how to design and realize specific applications or devices is still an issue to be solved. Based on this, we present an architecture and implementation method of modified signed-digit (MSD) optical adder from the...
As a new application model, cloud computing enables users to distribute virtual resource in cloud data center as demand. However, the performance declines as the increase of users. This paper focuses on the network and I/O performance decline due to the virtual machine image and virtual disk image densely deployment in Cloud computing management platform. The method and model for rapid deployment...
Based on parallelism of MSD addition, a new carry-free adder model for optical computer is proposed. Using MSD number system and four kinds of logic transforms, the model is built with input part and three optical calculators. With the model, addition is implemented with only logic operations without any carry. This can greatly improve the efficiency of addition operation. To guarantee the feasibility...
Chinese character recognition is integrated technology that is related to pattern recognition, artificial intelligence, fuzzy mathematics, information theory, computer science and so on. Currently a lot of researches focused on the Chinese character recognition have been done, however, the results are still not very satisfactory. In this paper, A new recognition method is put forward based on the...
Thread migration is an effective technique for fault resilience and load balancing in high performance computing. However, flexible thread migration is not easy to achieve. In this paper, we present an approach to creating migratory threads dynamically at application level. The targets must be executable source files. Compared to the static ones, the number of threads created during migration with...
The Copenhagen climate conference 2009 has concluded that we have to change the way how we live. Currently, several carbon management systems are being developed to meet enterprises' requirement. In addition, a number of carbon footprint calculation tools have been developed to fulfill carbon calculation needs from industries, households and individuals. However, under the current circumstance, it...
Cloud computing has been extremely tropical in the past few years. Both academic and industrial people have shown great interest in this area. Platform as a Service, which is the core application of cloud computing technologies, has got much attention as well. In this article, from the basic concept of PaaS, we analyze the basic characteristics of PaaS, and describe the current research status. Also...
Cloud computing is the development of parallel computing, distributed computing and grid computing. It has been one of the most hot research topics. Now many corporations have involved in the cloud computing related techniques and many cloud computing platforms have been put forward. This is a favorable situation to study and application of cloud computing related techniques. Though interesting, there...
In this paper, the design and implementation of a measurement system of response time for optical processor is presented. The system is used to measure the speed of ternary optical computer (TOC). The hardware of this system adopts photoelectric sensor, ADC and embedded systems; and the software adopts a cycle queue of samples, a data analysis program and a control program. The device of the design...
Fault tolerance is of importance to increase the dependability of computer systems. However, it is hard to be evaluated and validated, which will be either time-consuming or costly. Fault injection is an effective method to validate fault tolerance mechanisms. Among different fault injection techniques, software-implemented fault injection (SWIFI) is the most promising one. Although interesting, major...
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