James Hall - Academia.edu (original) (raw)

Papers by James Hall

Infotech@Aerospace 2012, 2012

We develop aerobatic maneuvering for obstacle avoidance by autonomous miniature air vehicles (MAV... more We develop aerobatic maneuvering for obstacle avoidance by autonomous miniature air vehicles (MAVs) using a path following control law. A method for developing maneuver paths that accounts for maneuver boundary conditions is presented along with a method for determining the orthogonal distance (position error) from the vehicle to the path. The control law is constructed as a unit-norm quaternion with position and rate components with a Lyapunov proof to demonstrate stability. The performance of the quaternion path following strategy in tracking various maneuvers appropriate for obstacle avoidance is demonstrated using the Aviones flight simulation environment.

Proceedings of the ACM SIGCOMM workshop on Models, methods and tools for reproducible network research - MoMeTools '03, 2003

This paper describes a system for the visualization of multiple protocols. The visualizer makes p... more This paper describes a system for the visualization of multiple protocols. The visualizer makes possible the identification of both intra and inter-protocol behaviour. This tool has become a critical resource in the development of our multi-protocol monitoring system; allowing the verification of the monitoring system, identification of new modes of behaviour and the easy visualization of potentially overwhelming quantities of information 1 .

Neuroscience and Medicine, 2012

Background: Exposure to elements in groundwater (toxic or beneficial) is commonplace yet, outside... more Background: Exposure to elements in groundwater (toxic or beneficial) is commonplace yet, outside of lead and mercury, little research has examined the impact of many commonly occurring exposures on mental abilities during the aging process. Selenium has antioxidant properties as part of the glutathione peroxidase system and may have protective effects on memory abilities. Objectives: To investigate the relationship of groundwater selenium exposure to neuropsychological status. Method: Analysis of data from 484 participants (148 men and 336 women) of Project FRONTIER, a community-based participatory research study of the epidemiology of health issues of rural-dwelling adults and elders. Results: Estimated selenium exposure (current and long-term) was specifically related to memory functioning without relation to other neurocognitive domains. The significant, positive link between selenium and memory (Immediate and Delayed) scores held regardless of APOE4 status as well as when the sample was restricted to only those without cognitive dysfunction. Current selenium was also associated with significantly reduced risk of cognitive decline prospectively. Conclusions: Higher selenium levels were associated with better memory functioning as well as reduced risk of cognitive decline among this community-based sample. Given the antioxidant properties of selenium, and the well-documented link between oxidative stress and the development of cognitive dysfunction and Alzheimer's disease, additional research is necessary to determine the utility of groundwater selenium monitoring as a potential population-wide prevention effort against Alzheimer's disease.

Proceedings of 22nd Annual Conference on Local Computer Networks

In the management of a modern LAN or campus network, two issues are of key importance, namely net... more In the management of a modern LAN or campus network, two issues are of key importance, namely network performance and capacity planning. In this paper we report on results from an experimental programme which aims to quantify the performance that can be achieved with a real distributed application running over a range of different network technologies, including Ethernet, ATM, FDDI, and a 100 Mb/s packet-switched LAN. In particular we analyse the contribution of each of the various application and network components to the overall performance experienced by applications. This information will facilitate planning and management of new networks, and permit the identification of "hidden costs" which prevent currently deployed applications from fully exploiting high bandwidth networks.

Journal of PeriAnesthesia Nursing, 2014

Seminars in Hearing, 1987

2009 Digest of Technical Papers International Conference on Consumer Electronics, 2009

A digital miromirror device (DMDtrade) is a micromachined high-density light-modulating system wi... more A digital miromirror device (DMDtrade) is a micromachined high-density light-modulating system widely used in front projectors, high-definition TVs and digital cinemas. Although the high-speed memory and digital control electronics have long been integrated underneath the micromirror array, high-voltage reset waveforms had been provided separately and synchronized with the DMD chip to actuate the micromirrors. In this work, using drain-extended transistors, the high-voltage driver electronics are successfully integrated on DMDs to generate local reset waveforms having voltage variations up to 30 V at a fast slew rate. At fast charging/discharging rates, the transistor reliability requirements are still satisfied and the driver electronics maintain low average current consumption.

Care management journals : Journal of case management ; The journal of long term home health care, 2003

This study evaluated the effect of case management, as a supplement to traditional substance abus... more This study evaluated the effect of case management, as a supplement to traditional substance abuse treatment, on health services utilization. Data for the study were taken from the Iowa Case Management Project (ICMP). The ICMP evaluated case management using a randomized research design. Residential clients who agreed to participate were randomly assigned to one of four case management conditions. The first three conditions were variations of the Iowa Case Management (ICM) model: (a) Inside Case Management, (b) Outside Case Management, and (c) Telecommunications. Case management clients in these three conditions were eligible for 12 months of case management. The fourth condition, the control condition, received no additional case management through ICMP. The study results show that the use of case management decreased the use of mental health services while increasing clients' use of inpatient care, access to physician, and the emergency room. It was expected that case manageme...

The British journal of educational psychology, Jan 21, 2015

Previous research has indicated that although academic buoyancy and student's achievement are... more Previous research has indicated that although academic buoyancy and student's achievement are associated, the relationship is relatively modest. We sought to determine whether another construct might link academic buoyancy and student's achievement. Based on prior theoretical and empirical work, we examined a sense of control as one possible linking mechanism. The study analysed data from 2,971 students attending 21 Australian high schools. We conducted a cross-lagged panel design as a first means of disentangling the relative salience of academic buoyancy, control, and achievement (Phase 1). Based upon these results, we proceeded with follow-up analyses of an ordered process model linking the constructs over time (Phase 2). Findings showed that buoyancy and achievement were associated with control over time, but not with one another (Phase 1). In addition, control appeared to play a role in how buoyancy influenced achievement and that a cyclical process may operate among th...

Urology, 2011

Intratesticular varix is an uncommon benign lesion whose clinical significance is not established... more Intratesticular varix is an uncommon benign lesion whose clinical significance is not established. It can be mistaken for a testicular tumor. Color Doppler ultrasonography of the testis with the Valsalva maneuver is diagnostic. UROLOGY 78: 1309,

Transportation Research Record, 2005

This paper describes the spatial information system infrastructure implemented by the Illinois De... more This paper describes the spatial information system infrastructure implemented by the Illinois Department of Transportation (IDOT) to enable delivery of information to management decision makers in asset management applications. This spatial data warehouse infrastructure makes extensive use of geographic information system (GIS) technologies to integrate information from a variety of database structures and formats. GIS products and tools have been developed to portray and analyze these data in useful combinations focused on practitioner needs. In June 1999 the Governmental Accounting Standards Board issued Statement 34 requiring governments to have a systematic approach to managing their assets. As a result, transportation agencies have placed an increased emphasis on developing mechanisms to integrate information from disparate management information systems and legacy databases. IDOT has used GIS to develop a spatial data warehouse to enable integration. A valuable characteristic of the department's information systems infrastructure is the embedding of the underlying link-node structure into roadway inventory databases to enable the direct linkage of data through various system identifiers, including differing milepost referencing and project numbering schemes. This direct linkage enables the complex integration of asset management-related data files across the enterprise and provides access to historical asset information. Changes to route referencing systems are readily accommodated, without loss of integrative capabilities. Outputs include a variety of userdeveloped analyses and output products with accessibility through networks, intranets, and the Internet.

Transportation Research Record, 2000

An in-depth investigation of the costs and benefits of geographic information system (GIS) implem... more An in-depth investigation of the costs and benefits of geographic information system (GIS) implementation in the Illinois Department of Transportation (IDOT) is presented. The investigation addresses a critical need to determine the organizational impact and cost-effectiveness of this enter-prisewide information technology to achieve the greatest benefit. IDOT conducted an enterprise wide effort to portray GIS capabilities and to identify candidate GIS projects. Fourteen major GIS projects were selected on the basis of management priority, ease of implementation, and user commitment. A comprehensive cost-benefit analysis was developed over fiscal years 1995 through 2004. Costs were reasonably estimated from historical costs of the GIS investigation effort and future costs of GIS technical support and user area resources. The greatest portions of costs, over the 10-year time frame, were for personnel (67 percent) and consultant services (19 percent). For the more difficult benefits d...

Political Studies Review, 2013

how “the Germans” saw the Games or rather which Germans saw the Games in which ways require[d] co... more how “the Germans” saw the Games or rather which Germans saw the Games in which ways require[d] considerable testing out’ (p. 4). Moreover, and at the evidential level, the fact that international as well as domestic factors affected West German planning meant that extensive archival research would need to be done in several countries and in multiple languages. Furthermore, the interpretation of the fruits of that research had to account for a number of issues, including, among others, the FRG’s domestic political scene, its place in the Cold War balance of power, and the evolving sense of historical identity among its citizenry. On this last subject, the 1972 Games represented, in the thinking of many FRG planners, a potential mechanism for moving the country beyond the dark shadow of its recent past. Sadly, the Black September murder of eleven Israeli Olympians destroyed any hope of reaching this objective. In the humble opinion of this reviewer, The 1972 Munich Olympics and the Making of Modern Germany is one of the more impressive scholarly studies on sport published in recent years. It is well researched and well argued on a topic of significant historical import. And it should help to further establish sport as a subject of legitimate scholarly inquiry.

Physics Letters A, 1982

The projectile Z1 and energy dependences of the ratio of double to single K-vacancy production ha... more The projectile Z1 and energy dependences of the ratio of double to single K-vacancy production have been measured for thin Ti targets bombarded by N, F, Mg, Al, Si, and Cl ions in the 2.0-6.5 MeV/amu range. A pronounced projectile charge state dependence of this ratio is observed for heavy near-symmetric collision systems. Present Address: Oak Ridge National Laboratory, P.O. Box X, Oak Ridge, TN 37830, USA.

Ocean & Coastal Management, 2008

Dugong habitats were considered in the design for the new zoning network for the Great Barrier Re... more Dugong habitats were considered in the design for the new zoning network for the Great Barrier Reef Marine Park as part of the Representative Areas Program. One of the specific design guidelines developed as part of the biophysical operational principles recommended that 50% of all high priority dugong habitats should be incorporated in the network of no-take areas. The high priority dugong habitat incorporated in no-take protection increased from 1396 to 3476 km 2 (or 16.9e42.0% of all identified sites). Although this increase in protection fell short of the recommended 50%, overall the level of protection afforded by the Great Barrier Reef Marine Park Zoning Plan 2003 increased for all the locations identified.

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1987

In this paper we present a description of the apparatus and results for experiments involving one... more In this paper we present a description of the apparatus and results for experiments involving one- and two-electron processes in collisions of heavy ions with H2 and He. The experiments were performed using one-electron and bare projectiles. In the first section we describe the measurement of pure ionization of one-electron projectiles by H2 targets and compare with previous results for

The Modern Language Review, 1951

Learning and Individual Differences, 2013

ABSTRACT Based on hypothesized reciprocal relations between psychological risk and academic buoya... more ABSTRACT Based on hypothesized reciprocal relations between psychological risk and academic buoyancy (dealing with ‘everyday’ academic setback in the ordinary course of school life), the present study used cross-lagged structural equation models to examine the relative salience of (1) prior academic buoyancy in predicting subsequent psychological risk and (2) prior psychological risk in predicting subsequent academic buoyancy. Academic buoyancy and psychological risk (academic anxiety, failure avoidance, uncertain control, emotional instability, neuroticism) measures were administered to 2971 students (11–19 years) from 21 Australian high schools at two time waves across a one-year interval. Analyses confirmed a reciprocal effects model in which psychological risk impacts academic buoyancy and academic buoyancy impacts psychological risk. The findings hold applied and conceptual implications for practitioners and researchers seeking to help students deal more effectively with adversity in school life.