Spectral analysis of the electrophysiological output at a single, midline prefrontal location (the vertex) was conducted in 482 individuals, ages 6-30 years old, to test the hypothesis that cortical slowing in the prefrontal region can serve as a basis for differentiating patients with attention deficit hyperactivity disorder (ADHD) from nonclinical control groups. Participants were classified into 3 groups (ADHD, inattentive; ADHD, combined; and control) on the basis of the results of a standardized clinical interview, behavioral rating scales, and a continuous performance test. Quantitative electroencephalographic (QEEG) findings indicated significant maturational effects in cortical arousal in the prefrontal cortex as well as evidence of cortical slowing in both ADHD groups, regardless of age or sex. Sensitivity of the QEEG-derived attentional index was 86%; specificity was 98%. These findings constituted a positive initial test of a QEEG-based neurometric test for use in the assessment of ADHD.

UltraScienceNet is an experimental wide-area network testbed to enable the development of networking technologies required for the next-generation large-scale scientific applications. It provides on-demand, dedicated, high bandwidth channels for large data transfers, and also high resolution, high-precision channels for fine control operations. In the initial deployment, its data-plane consists of several thousand miles of dual 10 Gbps lambdas. The channels are provisioned on-demand using layer-1 and layer-2 switches in the backbone and multiple service provisioning platforms at the edges in a flexible configuration using a secure control-plane. A centralized scheduler is employed to compute the future channel allocations, and a signaling daemon is used to generate the configuration signals to switches at appropriate times. The control-plane is implemented using an out-of-band virtual private network, which encrypts the switching signals and also provides authenticated user and application access. Transport experiments are conducted on a smaller test connection which provided us useful information about the basic properties and issues of utilizing dedicated channels in applications.Index Terms-Network testbed, dedicated channels, SONET, 10GigE WAN-PHY, control-plane, data-plane, bandwidth scheduler.

Confinement studies on the Impurity Study Experiment (ISX-B) in beam-heated plasmas contaminated with small quantities of low-Z impurities are reported. Experimental results on the correlation of particle and energy confinement are presented. A linear relationship of energy confinement and plasma density is observed. As density is increased further, this effect saturates and energy confinement becomes independent of electron density. The experiments have been extended to higher beam power, resulting in an expansion of the ISX-B operating space. Impurities other than neon (carbon and silicon) have been tried and do not produce an enhancement in confinement. Edge cooling by the introduction of impurities has been demonstrated. The change in confinement has been shown to be correlated with changes in the normalized poloidal field fluctuation level (Sg/Bg) but not with the density fluctuation level (n e /n e ). The experimental results are compared with models of drift-wave and resistive ballooning turbulence and an explanation is offered for the difference between the results with recycling and non-recycling impurities.

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A control-plane architecture for supporting advance reservation of dedicated bandwidth channels on a switched network infrastructure is described including the front-end web interface, user and token management scheme, bandwidth scheduler, and signaling daemon. A path computation algorithm for bandwidth scheduling is proposed based on an extension of Bellman-Ford algorithm to an algebraic structure on sequences of disjoint non-negative real intervals. An implementation of this architecture for UltraScience Net is briefly described.