An expert system for scheduling requests for communications Links between TDRSS and ERBS

An ERBS-TDRSS Contact Planning System (ERBS-TDRSS CPS) is described which uses a graphics interface and the NASA Transportable Interference Engine. The procedure involves transfer of the ERBS-TDRSS Ground Track Orbit Prediction data to the ERBS flight operations area, where the ERBS-TDRSS CPS automatically generates requests for TDRSS service. As requested events are rejected, alternative context sensitive strategies are employed to generate new requested events until a schedule is completed. A report generator builds schedule requests for separate ERBS-TDRSS contacts

Operational aspects of a spacecraft planning/scheduling expert system

Various operational aspects of the Earth Radiation Budget Satellite (ERBS) Tracking and Data Relay Satellite System (TDRSS) are described. The ERBS-TDRSS Contract Planning System is an expert system which has been used operationally since June 1987 by the ERBS Flight Operations Team (FOT) at Goddard Space Flight Center to build weekly schedules of requests for service from the TDRSS. The basic operation of the system and significant enhancements and changes are discussed

Using C to build a satellite scheduling expert system: Examples from the Explorer Platform planning system

A C-based artificial intelligence (AI) development effort which is based on a software tools approach is discussed with emphasis on reusability and maintainability of code. The discussion starts with simple examples of how list processing can easily be implemented in C and then proceeds to the implementations of frames and objects which use dynamic memory allocation. The implementation of procedures which use depth first search, constraint propagation, context switching, and blackboard-like simulation environment are described. Techniques for managing the complexity of C-based AI software are noted, especially the object-oriented techniques of data encapsulation and incremental development. Finally, all these concepts are put together by describing the components of planning software called the Planning And Resource Reasoning (PARR) Shell. This shell was successfully utilized for scheduling services of the Tracking and Data Relay Satellite System for the Earth Radiation Budget Satellite since May of 1987 and will be used for operations scheduling of the Explorer Platform in Nov. of 1991

Using C to build a satellite scheduling expert system: Examples from the Explorer platform planning system

Recently, many expert systems were developed in a LISP environment and then ported to the real world C environment before the final system is delivered. This situation may require that the entire system be completely rewritten in C and may actually result in a system which is put together as quickly as possible with little regard for maintainability and further evolution. With the introduction of high performance UNIX and X-windows based workstations, a great deal of the advantages of developing a first system in the LISP environment have become questionable. A C-based AI development effort is described which is based on a software tools approach with emphasis on reusability and maintainability of code. The discussion starts with simple examples of how list processing can easily be implemented in C and then proceeds to the implementations of frames and objects which use dynamic memory allocation. The implementation of procedures which use depth first search, constraint propagation, context switching and a blackboard-like simulation environment are described. Techniques for managing the complexity of C-based AI software are noted, especially the object-oriented techniques of data encapsulation and incremental development. Finally, all these concepts are put together by describing the components of planning software called the Planning And Resource Reasoning (PARR) shell. This shell was successfully utilized for scheduling services of the Tracking and Data Relay Satellite System for the Earth Radiation Budget Satellite since May 1987 and will be used for operations scheduling of the Explorer Platform in November 1991

Abdominal functional electrical stimulation to assist ventilator weaning in acute tetraplegia: a cohort study

Background Severe impairment of the major respiratory muscles resulting from tetraplegia reduces respiratory function, causing many people with tetraplegia to require mechanical ventilation during the acute stage of injury. Abdominal Functional Electrical Stimulation (AFES) can improve respiratory function in non-ventilated patients with sub-acute and chronic tetraplegia. The aim of this study was to investigate the clinical feasibility of using an AFES training program to improve respiratory function and assist ventilator weaning in acute tetraplegia.<p></p> Methods AFES was applied for between 20 and 40 minutes per day, five times per week on four alternate weeks, with 10 acute ventilator dependent tetraplegic participants. Each participant was matched retrospectively with a ventilator dependent tetraplegic control, based on injury level, age and sex. Tidal Volume (VT) and Vital Capacity (VC) were measured weekly, with weaning progress compared to the controls.<p></p> Results Compliance to training sessions was 96.7%. Stimulated VT was significantly greater than unstimulated VT. VT and VC increased throughout the study, with mean VC increasing significantly (VT: 6.2 mL/kg to 7.8 mL/kg VC: 12.6 mL/kg to 18.7 mL/kg). Intervention participants weaned from mechanical ventilation on average 11 (sd: ± 23) days faster than their matched controls.<p></p> Conclusion The results of this study indicate that AFES is a clinically feasible technique for acute ventilator dependent tetraplegic patients and that this intervention may improve respiratory function and enable faster weaning from mechanical ventilation.<p></p&gt

The MPCP Longitudinal Educational Growth Study Third Year Report

This is the third-year report in a five-year evaluation of the Milwaukee Parental Choice Program (MPCP). The MPCP, which began in 1990, provides government-funded vouchers for low-income children to attend private schools in the City of Milwaukee. The maximum voucher amount in 2008-09 was $6,607, and approximately 20,000 children used a voucher to attend either secular or religious private schools. The MPCP is the oldest and largest urban school voucher program in the United States. This evaluation was authorized by Wisconsin Act 125 enacted in 2005

Predictors of Goggle Use among Racquetball Players

Racquetball is a popular, high-intensity competitive sport that requires quick reflexes and keen spatial awareness. Players may be vulnerable to eye injuries, which could be prevented through use of proper protective eyewear (Feigelman, Sugar, Jednock, Read, & Johnson, 1983). Given the low rates of goggle use among squash players (Eime, Owen, & Finch, 2004), the use of goggles among racquetball players is suspected to be low. However, to date there have been no studies investigating predictors of goggle use in racquetball players. Understanding the rates and predictors of goggle use among racquetball players is an important prerequisite to developing effective intervention programs. The present study explores: (a) the rate of goggle use in a sample of racquetball players from the Midwest US; (b) self-reported reasons for use/non-use, and; (c) the relationship between demographic variables, player characteristics, and behavioral variables and cognitive variables. The majority of racquetball players in this study reported not using goggles and that they had never given much thought to doing so. Players who perceived their risk of injury to be low and the cost and comfort of goggles to be unacceptable were least likely to report using goggles. This suggests the need for increased awareness of injury risk and free access to comfortable, effective eyewear as a first step towards promoting goggle use. However, education rarely leads to significant behavior change in the absence of a broader ecological approach (Eime et al., 2004). The present findings are consistent with Eime et al.’s (2004) Protective Eyewear Promotion (PEP) model. This model suggests that educating squash players regarding the need for appropriate eyewear, increasing the availability of eyewear, making specific recommendations for use, and offering incentives for eyewear adoption all help to promote behaviour change. A recent effectiveness study indicated that PEP was associated with increased use of goggles by squash players (Eime, Finch, Wolfe, & McCarty, 2005). Similar intervention studies among racquetball players are needed and would help inform efforts to reduce the incidence of racquetball-related eye injury

Two-Dimensional Electronic Structure of the GaAs(110)-Bi System

The occupied electronic structure of the GaAs(110)-Bi(1×1) monolayer system has been studied using angle-resolved photoelectron spectroscopy with a synchrotron-radiation source. The overlayer system possesses at least three detectable surface states (S’, S’’ and S’’’) with two-dimensional character. Both the state with the lowest (S’) and the state with the highest (S’’’) binding energy are clearly visible over a large portion of the (1×1) surface Brillouin zone. The intermediate state (S’’) was observed along Γ¯ X¯ ’ and also in the neighborhood of X¯. The intensity of all three states exhibits a predominantly pz-like dependence on the polarization of the synchrotron light. However, S’’’ possesses a greater component of pxy-like character than either S’ or S’’. At the zone center, S’ is situated 0.5 eV above the valence-band maximum, and it disperses downwards by ≊1.0 eV to X¯, and by ≊0.8 eV to X¯ ’. At M¯ it has its binding-energy maximum, 1.3 eV below the energetic position at Γ¯. The two-dimensional electronic structure of this system is compared with that of the closely related GaAs(110)-Sb(1×1) monolayer system and with the results of first-principles calculations

Electronic Band Structure of the Two-Dimensional Surface-State Bands of the (1×1) and (1×2) Phases of Bi/GaSb(110)

The surface-state bands of the (1×1) and (1×2) phases of Bi/GaSb(110) have been probed using angle-resolved ultraviolet photoemission spectroscopy with synchrotron radiation. Four Bi-induced surface-state bands have been identified for both the (1×1) and the (1×2) phases. The bands with the lowest binding energies (SI and SII) have been attributed to intrachain bonding in the Bi overlayer and the higher-binding-energy bands (SIII and SIV) to overlayer states involved in the back bonding of the overlayer to the substrate. Based on initial-state dispersion measurements, we conclude that the Bi chains in the epitaxial overlayer remain intact throughout the phase transition. We propose a model for the overlayer structure of the (1×2) phase of Bi/GaSb(110)

ICIS 2011 Panel Report: Are We on the Wrong Track and Do MIS Curricula Need to Be Reengineered?

The discipline of MIS has been going through extensive soul searching in recent years. Part of that soul searching deals with the question of whether we are teaching our students the right material considering the emerging apparent rift, caused in part by new technologies, between what the industry needs and what we teach. This article summarizes a panel on this topic held at the 32nd meeting of the International Conference on Information Systems (ICIS) in Shanghai 2011. The objective of the panel was to contrast what industry tells us they need and we do not give them, as presented by Gefen and Ragowsky based on several years of CIO roundtables and interviews, with a “balanced head” perspective presented by some of the most respected leaders in our field. The panel attracted an audience of approximately 160 attendees who took an active role in the discussion. Rather surprisingly, disagreements among the panelists were not as pronounced as might have been expected, and the audience mostly supported the antagonist position. We present this summary to our colleagues in MIS in the hope of eliciting a continued discussion on this crucial issue