A low-cost design of an optical wireless network of multiple transmitters and receivers based on the CDMA-architecture for perimeter surveillance and access control and is described. Simulation and scaled-model experi...
详细信息
This paper presents an integrated power system for low-power wireless sensor networks with dynamic efficiency optimization technique. By adaptively resizing power transistors and adjusting switching frequency, system ...
详细信息
This paper presents an integrated power system for low-power wireless sensor networks with dynamic efficiency optimization technique. By adaptively resizing power transistors and adjusting switching frequency, system efficiency is enhanced significantly. Theoretical analysis is elaborated to support the proposed technique. A prototype integrated power system for self-powered photovoltaic wireless sensing node was designed and simulated with TSMC 0.35μm CMOS process. With a power range of 0.5μW to 10mW, power efficiency stays above 71%. Tolerance between theoretical and simulated optimal power transistor sizes is less than 6.7%, while that of optimal switching frequencies is less than 5%. The paper gives another solution to minimizing system power in the perspective of power processing. Copyright 2005 ACM.
The crucial factor affecting the modern power systems today is load flow control. The Unified Power Flow Controller (UPFC) is an effective means for controlling the power flow and can provide damping capability during...
详细信息
There have been various secure routing protocols proposed for mobile ad hoc networks. Most of these protocols are analyzed by two standard techniques: simulation and security analysis. There has been a lack of work re...
详细信息
ISBN:
(纸本)159593183X
There have been various secure routing protocols proposed for mobile ad hoc networks. Most of these protocols are analyzed by two standard techniques: simulation and security analysis. There has been a lack of work related to the performance of secure routing protocols in real network testbed. In this paper, we present quantitative results for the performance comparisons between AODV and SAODV routing protocols by using a small-scale experimental testbed, which consists of 10 laptops within a 250 m by 100 m rugby field. Apart from outdoor testing, we also compare the results with those obtained via simulation and indoor emulation. The workload includes both UDP and TCP traffic. Results show that SAODV is effective in preventing routing message tampering and data dropping attacks. For outdoor experiments, we also estimate the average distance within a communication gray zone under different bit rates. Copyright 2005 ACM.
The hardware implementation issues of multiuser interference cancellation techniques for multirate asynchronous Direct-Sequence Code Division Multi-Access (DS-CDMA) systems based on variable spreading factor (VSF) are...
详细信息
In this paper, we propose a multi-buffer scheduling scheme for streaming video systems. A transmission rate is obtained via a rate control algorithm, which optimally utilizes the network bandwidth and client buffer re...
详细信息
In this paper, a framework for replacing missing values in a database is proposed since a real-world database is seldom complete. Good data quality in a database can directly improve the performance of any data mining...
详细信息
Summary form is only given. Breakthrough-quality scientific discoveries in the new millennium (such as those expected in computation biology and others), along with optimal engineering designs, have created a demand f...
详细信息
Summary form is only given. Breakthrough-quality scientific discoveries in the new millennium (such as those expected in computation biology and others), along with optimal engineering designs, have created a demand for High-End Computing (HEC) systems with sustained performance requirements at a petaflop scale and beyond. Despite the very pessimistic (if not negative) views on parallel computing systems that have prevailed in 1990s, there seems to be no other viable alternatives for such HEC systems. In this talk, we present a fresh look at the problems facing the design of petascale parallel computing systems. We review several fundamental issues that such HEC parallel computing systems must resolve. These issues include: execution models that support dynamic and adaptive multithreading, fine-grain synchronization, and global name-space and memory consistency. Related issues in parallel programming, dynamic compilation models, and system software design will also be discussed. Present solutions and future direction will be discussed based on (1) application demand (e.g. computation biology and others), (2) the recent trend as demonstrated by the HTMT, HPCS, and the Blue-Gene Cyclops (e.g. Cyclops-64) architectures, and (3) a historical perspective on influential models such as dataflow, along with concepts learned from these models.
FPGA prototyping is an evolving science that has recently entered the multimillion-gate design arena. The availability of such technology has come at a cost however, in that new design methodologies, tools and devices...
详细信息
FPGA prototyping is an evolving science that has recently entered the multimillion-gate design arena. The availability of such technology has come at a cost however, in that new design methodologies, tools and devices are required to extract the full potential of the discipline. In this paper we present a FPGA prototype used in the implementation, verification and validation of a multimillion gate DVB-H system-on-chip receiver. The process of developing such a prototype is elaborated and its significant contribution towards productivity increases in the EDA industry is substantiated with reference to successful laboratory experimentation. The paper is concluded with a description of the findings on how the industry is to evolve for prototyping to unravel its full potential.
This paper presents a new, practical, and realizable methodology and scheme for an optimal hybrid tracking control problem for continuous neutral time-delay system. A continuous-time linear quadratic cost function tha...
详细信息
ISBN:
(纸本)0889865027
This paper presents a new, practical, and realizable methodology and scheme for an optimal hybrid tracking control problem for continuous neutral time-delay system. A continuous-time linear quadratic cost function that has a high-gain property is used for tracking control specification. Two interpolation formulas together with an extended state vector are applied to directly convert the original analog optimal tracking problem into an equivalent digital optimal regulator problem. Then, using the discrete-time optimal control theory and an indirect digital redesign technique with a predictive feature, an effective low-gain digital tracker, without losing the pre-specified high-quality performance in the continuous domain, is designed for the original analog neutral time-delay system.
暂无评论