Markov models are memoryless and are used to study systems whose future probabilistic behavior is uniquely determined by their present state. This property is extremely useful in the analysis of many complex engineeri...
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ISBN:
(纸本)078038217X
Markov models are memoryless and are used to study systems whose future probabilistic behavior is uniquely determined by their present state. This property is extremely useful in the analysis of many complex engineering systems. It is proposed to employ this type of model to study and assess the performance of an Integrated Renewable Energy System (IRES). An IRES utilizes two or more renewable energy resources, conversion technologies, and end-use technologies to supply a variety of energy and other needs in remote areas. There will be multiple inputs and outputs in different forms. Hierarchical Modeling Technique in which states are established based on primary failures, secondary failures etc. will be used. This model will be helpful in assessing the performance of IRES in terms of state probabilities and residence times.
This paper demonstrates a successful application of wavelength division multiplexing (WDM) to the avionics environment to support analog RF signal transmission. We investigate the simultaneous transmission of four RF ...
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This paper considers a novel model of a single phase, capacitor start induction motor that is based on the use of an ideal rotating transformer (IRTF). The model is an extension of the IRTF based model already used fo...
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This paper considers a novel model of a single phase, capacitor start induction motor that is based on the use of an ideal rotating transformer (IRTF). The model is an extension of the IRTF based model already used for modelling three phase and DC machines. The paper outlines the new model and discusses an application of the model, A TRIAC is connected in series with the machine as to allow control of the motor speed. Experimental and simulation results of the new model confirm the validity of the work carried out.
Mobility for a great portion of robot mechanisms having over-constraint and non-holonomic constraints has not been clearly identified. This work is to introduce a method of mobility analysis for such systems using the...
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Mobility for a great portion of robot mechanisms having over-constraint and non-holonomic constraints has not been clearly identified. This work is to introduce a method of mobility analysis for such systems using the concept of representative screws and pseudo-joint. The pseudo-joint is employed to effectively represent the real motion trajectory due to the rolling contact of the wheel. To show the validity and effectiveness of the proposed method, mobility of various types of planar mobile robots having over-constraint and non-hoionomic constrains are examined.
This paper discusses the point covering problem solved by ant algorithm. Point covering problem is hard to solve with great actual value. Ant algorithm is a newly emerged stochastic searching optimization algorithm hi...
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ISBN:
(纸本)0780384032
This paper discusses the point covering problem solved by ant algorithm. Point covering problem is hard to solve with great actual value. Ant algorithm is a newly emerged stochastic searching optimization algorithm hi recent years. A distributed parallel algorithm of point covering is presented with ant algorithm. Experiment results demonstrate that the algorithm is effective.
This work investigates multiple-mode tracking method with node selec.ion using bearings-only measurements. We combine multiple-mode extended Kalman filter with node resource management to conserve energy while trackin...
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This work investigates multiple-mode tracking method with node selec.ion using bearings-only measurements. We combine multiple-mode extended Kalman filter with node resource management to conserve energy while tracking a maneuvering target. Experiments using real data show that the MM adapts quicker to target maneuvers than the realizable single-mode tracker. Additional experiments show that the simplex node selec.ion leads to better geolocation performance compared to the closest node selec.ion when the number of active nodes is set to two.
In this paper, we outline a new connection admission control and online traffic engineering framework for small networks using differentiated services. Decisions are made at the edge routers of the network. Multiple l...
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In this paper, we outline a new connection admission control and online traffic engineering framework for small networks using differentiated services. Decisions are made at the edge routers of the network. Multiple label switched paths are set up between each pair of edge routers. When a new connection arrives at an edge router, each path is evaluated to see whether it is able to carry the connection. Then, the best path of the remaining ones is picked. The evaluation of paths is based on state information gathered from the queues on each path. We show the results this sch.me achieves based on simulations.
A cracker who gains access to a computer system will normally install some method, for use at a later time that allows the cracker to come back onto the system with root privilege. One method that a cracker may use is...
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A cracker who gains access to a computer system will normally install some method, for use at a later time that allows the cracker to come back onto the system with root privilege. One method that a cracker may use is the installation of a rootkit on the compromised system. A kernel level rootkit will modify the underlying kernel of the installed operating system. The kernel controls everything that happens on a computer. We are developing a standardized methodology to characterize rootkits. The ability to characterize rootkits will provide system administrators, researchers, and security personnel with the information necessary in order to take the best possible recovery actions. This may also help to detect and fingerprint additional instances and prevent further security instances involving rootkits. We propose new methods for characterizing kernel level rootkits. These methods may also be used in the detection of kernel rootkits.
In this paper, we deal with the kinematic and dynamic modeling of hybrid robotic systems that are constructed by combination of parallel and serial modules or series of parallel modules. Up to now, open-tree structure...
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In this paper, we deal with the kinematic and dynamic modeling of hybrid robotic systems that are constructed by combination of parallel and serial modules or series of parallel modules. Up to now, open-tree structure has been generally employed for dynamic modeling of hybrid robotic systems. However, it requires not only expensive computation as the complexity of the system increases, but also must perform dynamic modeling for the whole manipulator again even if the partial portion of the robot structure is changed. Therefore, we propose an efficient dynamic modeling methodology for hybrid robotic systems. In the proposed method, initially the local dynamics of each of modules are obtained with respect to its independent joint coordinates and then the dynamics of the hybrid robot is calculated utilizing the concept of virtual joints that are attached to the base of each module of interest. The virtual joints are assigned to have the appropriate number of DOFs in the operational space to represent the motion of all the proximal modules from the module of interest to the ground. For general multiple module-based hybrid robots, a recursive dynamic formulation of the proposed method is derived and the usefulness of the method is verified by comparing the computational efficiency of both the proposed method and the existing method.
Recent demands of Internet service increase the number of concurrent activities to be supported by server applications. Thus efficient support for a number of threads in operating systems is one of the critical issues...
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ISBN:
(纸本)0889864470
Recent demands of Internet service increase the number of concurrent activities to be supported by server applications. Thus efficient support for a number of threads in operating systems is one of the critical issues in Internet computing. Recent versions of Linux operating system employ O(1) sch.duler to realize efficient thread sch.duling. However, O(1) sch.duler does not take account of the affinity of threads which share the same address space. Based on O(1) sch.duler, we develop a sch.duler to enhance throughput of multi-threaded server applications on off-the-shelf Linux platforms. Our sch.duler aggregates threads which share the same memory address space, and can exploit locality of reference, reduce context switch overhead, and support high degree of concurrency. Our performance evaluation shows that our sch.duler can improve the throughput and scalability of Internet server applications such as chatroom server and web server.
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