2078204
Multi-domain Lambda Grid data portal for collaborative Grid applications
This paper presents the iGrid2005 demonstration of the multi-domain Lambda Grid data portal to enable collaborative Grid applications to retrieve gigabyte-size scientific datasets on demand over a wide-area Lambda Grid test-bed spanning across the United States and Europe. The data portal allows collaborative users to register and discover distributed datasets across a multi-domain Lambda Grid through a web-service based dataset registry and search engine, and to deliver the discovered datasets through dynamic established lightpaths to specified computing cluster locations for dataset manipulation. The data portal employs the novel Secure Photonic Inter-domain Negotiator (SPIN) as a secure multidomain control plane to set up dynamic lightpaths between the source and destination clusters for respective storage and manipulation of the discovered datasets over a multi-domain Lambda Grid. The data portal employs lamhda-aware middleware and transport protocol to optimize transfer of the discovered datasets over the dynamic established lightpaths. Implementation details and observed performance results from the demonstrations of the SPIN-based Lambda Grid data portal are reported.
27267454
Optimization of loss-balanced multicast in all-optical WDM networks
In wavelength-division multiplexing (WDM) optical networks, multicast is implemented by constructing a light-forest, which is a set of light-trees with each light-tree rooted from the multicast source and terminated at a partition subset of the destination nodes. Multicast routing scenario has considerable impact on the quality of optical signal received at each destination. To guarantee the fairness of signal quality at different destinations in a multicast session, it is desirable to construct a loss-balanced light-forest to deliver the multicast traffic. A loss-balanced light-forest is composed of a set of light-trees bounded in size (number of destinations per multicast tree), in size variation (difference in the number of destinations among different multicast trees), and in dimension (maximum source-to-destination distance on each multicast tree). This paper investigates the multicast routing and wavelength assignment (MC-RWA) problem under the loss-balance constraint. The problem is formulated as an optimization model using integer linear programming (ILP). Numerical solutions to the optimization model can supply useful performance benchmarks for loss-balance-constrained optical multicast in WDM networks.
1225370
The Impact of NBTI on the Performance of Combinational and Sequential Circuits
Negative-bias-temperature-instability (NBTI) has become the primary limiting factor of circuit lifetime. In this work, we develop a general framework for analyzing the impact of NBTI on the performance of a circuit, based on various circuit parameters such as the supply voltage, temperature, and node switching activity of the signals etc. We propose an efficient method to predict the degradation of circuit performance based on circuit topology and the switching activity of the signals over long periods of time. We demonstrate our results on ISCAS benchmarks and a 65 nm industrial design. The framework is used to provide key design insights for designing reliable circuits. The key design insights that we obtain are: (1) degradation due to NBTI is most sensitive on the input patterns and the duty cycle; the difference in the delay degradation can be up to 5X for various static and dynamic conditions, (2) during dynamic operation, NBTI-induced degradation is relatively insensitive to supply voltage, but strongly dependent on temperature; (3) NBTI has marginal impact on the clock signal.
11588495
SRAM Cell Optimization for Ultra-Low Power Standby
This paper proposes a comprehensive SRAM cell optimization scheme that minimizes leakage power under ultra-low standby supply voltage (VDD). The theoretical limit of data retention voltage (DRV), the minimum VDD that preserves the states of a memory cell, was derived to be 50 mV for an industrial 90 nm technology. A DRV design model was developed on parameters including body bias, sizing, and channel length. A test chip was implemented and measured to attain DRV sensitivities to key design parameters. Based on this, a low-leakage SRAM cell design methodology is derived and the feasibility of a 270 mV standby VDD was demonstrated, including a safety margin of 100 mV. As a result, the SRAM leakage power was reduced by 97%.
19011643
Total-Order Planning with Partially Ordered Subtasks
One of the more controversial recent planning algorithms is the SHOP algorithm, an HTN planning algorithm that plans for tasks in the same order that they are to be executed. SHOP can use domaindependent knowledge to generate plans very quickly, but it can be difficult to write good knowledge bases for SHOP. 
 
Our hypothesis is that this difficulty is because SHOP's total-ordering requirement for the subtasks of its methods is more restrictive than it needs to be. To examine this hypothesis, we have developed a new HTN planning algorithm called SHOP2. Like SHOP, SHOP2 is sound and complete, and it constructs plans in the same order that they will later be executed. But unlike SHOP, SHOP2 allows the subtasks of each method to be partially ordered. 
 
Our experimental results suggest that in some problem domains, the difficulty of writing SHOP knowledge bases derives from SHOP's total-ordering requirement--and that in such cases, SHOP2 can plan as efficiently as SHOP using knowledge bases simpler than those needed by SHOP.
11529301
Modeling within-die spatial correlation effects for process-design co-optimization
Within-die spatial correlation of device parameter values caused by manufacturing variations has a significant impact on circuit performance. Based on experimental and simulation results, we: (1) characterize the spatial correlation of gate length over a full-field range of horizontal and vertical separation; (2) develop a rudimentary spatial correlation model; and (3) investigate its impact an the variability of circuit performance.
6260783
Style components
We propose a novel method for interactive editing of motion data based on motion decomposition. Our method employs Independent Component Analysis (ICA) to separate motion data into visually meaningful components called style components. The user then interactively identifies suitable style components and manipulates them based on a proposed set of operations. In particular, the user can transfer style components from one motion to another in order to create new motions that retain desirable aspects of the style and expressiveness of the original motion. For example, a clumsy walking motion can be decomposed so as to separate the clumsy nature of the motion from the underlying walking pattern. The clumsy style component can then be applied to a running motion, which will then yield a clumsy-looking running motion. Our approach is simple, efficient and intuitive since the components are themselves motion data. We demonstrate that the proposed method can serve as an effective tool for interactive motion analysis and editing.