Fuzzy Modeling and Parallel Distributed Compensation for Aircraft Flight Control from Simulated Flight Data

A method is described that combines fuzzy system identification techniques with Parallel Distributed Compensation (PDC) to develop nonlinear control methods for aircraft using minimal a priori knowledge, as part of NASAs Learn-to-Fly initiative. A fuzzy model was generated with simulated flight data, and consisted of a weighted average of multiple linear time invariant state-space cells having parameters estimated using the equation-error approach and a least-squares estimator. A compensator was designed for each subsystem using Linear Matrix Inequalities (LMI) to guarantee closed-loop stability and performance requirements. This approach is demonstrated using simulated flight data to automatically develop a fuzzy model and design control laws for a simplified longitudinal approximation of the F-16 nonlinear flight dynamics simulation. Results include a comparison of flight data with the estimated fuzzy models and simulations that illustrate the feasibility and utility of the combined fuzzy modeling and control approach

First Amendment and Land Use, in Recent Developments in Land Use, Planning, and Zoning

In the mid-1980s, the focus in this area of the law was on nuisance closures and license revocation actions affecting adult bookstores and other kinds of establishments where either obscenity or illicit sexual activities were taking place. In our last committee report focusing on the first amendment area we reported on those areas of the law in light of the Supreme Court\u27s decision in Arcara v. Cloud Books, Inc. Since then, there has been one important Fifth Circuit decision, FW/PBS Inc. v. City of Dallas, that the Supreme Court has agreed to review, with a decision expected in 1989. There have been two recent important federal court decisions involving the zoning of religious institutions and religious uses, and a number of significant federal and state court decisions applying the Supreme Court\u27s standards for assessing the constitutionality of sign regulations established in Metromedia, Inc. v. City of San Diego. But, by far the most important decision in the last year in this area of land-use law was the Supreme Court\u27s decision in City of Lakewood v. Plain Dealer Publishing Co., involving regulation of newspaper vending machines on public property

First Amendment and Land Use, in Recent Developments in Land Use, Planning, and Zoning

In the mid-1980s, the focus in this area of the law was on nuisance closures and license revocation actions affecting adult bookstores and other kinds of establishments where either obscenity or illicit sexual activities were taking place. In our last committee report focusing on the first amendment area we reported on those areas of the law in light of the Supreme Court\u27s decision in Arcara v. Cloud Books, Inc. Since then, there has been one important Fifth Circuit decision, FW/PBS Inc. v. City of Dallas, that the Supreme Court has agreed to review, with a decision expected in 1989. There have been two recent important federal court decisions involving the zoning of religious institutions and religious uses, and a number of significant federal and state court decisions applying the Supreme Court\u27s standards for assessing the constitutionality of sign regulations established in Metromedia, Inc. v. City of San Diego. But, by far the most important decision in the last year in this area of land-use law was the Supreme Court\u27s decision in City of Lakewood v. Plain Dealer Publishing Co., involving regulation of newspaper vending machines on public property

Global Aerodynamic Modeling Using Automated Local Model Networks in Real Time

A novel method is presented for automated real-time global aerodynamic modeling using local model networks, known as Smoothed Partitioning with Localized Trees in Real Time (SPLITR), as part of NASAs Learn-to-Fly technology development initiative. The global nonlinear aerodynamics are partitioned into several local regions known as cells, with the dimension, location, and timing of each partition automatically selected based on a residual characterization procedure, under the constraints of real-time operation. Regression trees represent the successive partitioning of the global flight envelope and describe the evolution of the cell structure. Recursive equation-error least-squares parameter estimation in the time domain is used to estimate a model that represents the local aerodynamics in each region, so that it can be updated independently with non-contiguous data in the range of each cell over time. A weighted superposition of these piecewise local models across the flight envelope forms a global nonlinear model that also accurately captures the local aerodynamics. The SPLITR approach is demonstrated using both simulation and flight data, and the results are analyzed in terms of model predictive capabilities as well as interpretability. The results show that SPLITR can be used to automatically partition complex nonlinear aerodynamic behavior, produce an accurate model, and provide valuable physical insight into the local and global aerodynamics

Preliminary indications of water film distribution and thickness on an airfoil in a water spray

A sensor for measuring water film thickness is evaluated. The test is conducted in a small flow apparatus with a 1 ft chord model wing in a water spray. Photographic and visual observations are made of the upper wing surface and film thickness is measured on the upper and lower wing surfaces. The performance of the sensor appears highly satisfactory, and where valid comparisons can be made, repeatable results are obtained

Hurricane Sandy: A Case Study of the Eastern District of New York\u27s Effort to Address Mass Litigation Resulting from the Effects of Climate Change

On the evening of October 29, 2012, “Hurricane” Sandy made land- fall on the New York coastline, battering the land with strong winds, torrential rain, and record-breaking storm surges. Homes and commercial structures were destroyed; roads and tunnels were flooded; and more than 23,000 people sought refuge in temporary shelters, with many others facing weeks without power and electricity. At the time, Sandy was heralded as one of the costliest hurricanes in the his- tory of the United States; the second costliest hurricane only to Katrina, which hit New Orleans in 2005. Unfortunately, recent experience with Hurricanes Florence, Maria, Harvey, and Irma suggest that this pattern of devastating superstorms may become the new norm as climate change produces more extreme and unpredictable weather events. In Sandy’s aftermath, as individuals returned to their homes, or what remained of them, and communities began to rebuild, the true cost of the storm became apparent. A year after the storm, the Federal Emergency Management Agency (“FEMA”) estimated that over $1.4 billion in assistance was provided to 182,000 survivors of the dis- aster; another$3.2 billion was provided to state and local governments for debris removal, infrastructure repair, and emergency protective measures. More than $2.4 billion was provided to individuals and businesses in the form of low-interest loans through the Small Business Administration (“SBA”), and millions more were spent on grants de- signed to implement mitigation measures in the future and to provide unemployment assistance to survivors. Before the storm, homeowners paid premiums for flood insurance provided through the National Flood Insurance Program (“NFIP”), and for homeowner’s insurance provided by dozens of private insurers. In the months following the storm, they began to file claims for assistance in rebuilding their homes. While many such claims were re- solved successfully, many homeowners were unhappy with the settlement amounts offered by their insurance carriers and felt compelled to file lawsuits in the surrounding state and federal courts. Many of those lawsuits were filed in the United States District Court for the Eastern District of New York (“EDNY”). This case study describes the EDNY’s specifically crafted, unique approach to handling the mass litigation that ensued from Sandy’s devastation, documents some of the problems that the Court faced during that mass litigation, and describes some of the lessons learned from the Court’s experience

Superconducting Magnets Used as a Magnetic Bumper/Tether System

Development of new materials for superconducting trapped field (permanent) magnets, and a continuation of tests on a magnetic bumper/tether for spacecraft docking is reported

Therapeutic Alliance and Involuntary Commitment of a Minor

Children are legally entitled to be present throughout the commitment hearing for continued hospitalization. The effect of this process on the therapeutic alliance between the child and the psychiatrist warrants examination. A case study of a 14 year-old boy who participated in the court proceedings is presented. The outcome of the hearing resulted in a disruption of the therapeutic alliance. Alter natives to current commitment procedures for minors are discussed

How do validated measures of functional outcome compare with commonly used outcomes in administrative database research for lumbar spinal surgery?

Clinical interpretation of health services research based on administrative databases is limited by the lack of patient-reported functional outcome measures. Reoperation, as a surrogate measure for poor outcome, may be biased by preferences of patients and surgeons and may even be planned a priori. Other available administrative data outcomes, such as postoperative cross sectional imaging (PCSI), may better reflect changes in functional outcome. The purpose was to determine if postoperative events captured from administrative databases, namely reoperation and PCSI, reflect outcomes as derived by validated functional outcome measures (short form 36 scores, Oswestry disability index) for patients who underwent discretionary surgery for specific degenerative conditions of the lumbar spine such as disc herniation, spinal stenosis, degenerative spondylolisthesis, and isthmic spondylolisthesis. After reviewing the records of all patients surgically treated for disc herniation, spinal stenosis, degenerative spondylolisthesis, and isthmic spondylolisthesis at our institution, we recorded the occurrence of PCSI (MRI or CT-myelograms) and reoperations, as well as demographic, surgical, and functional outcome data. We determined how early (within 6 months) and intermediate (within 18 months) term events (PCSI and reoperations) were associated with changes in intermediate (minimum 1 year) and late (minimum 2 years) term functional outcome, respectively. We further evaluated how early (6–12 months) and intermediate (12–24 months) term changes in functional outcome were associated with the subsequent occurrence of intermediate (12–24 months) and late (beyond 24 months) term adverse events, respectively. From 148 surgically treated patients, we found no significant relationship between the occurrence of PCSI or reoperation and subsequent changes in functional outcome at intermediate or late term. Similarly, earlier changes in functional outcome did not have any significant relationship with subsequent occurrences of adverse events at intermediate or late term. Although it may be tempting to consider administrative database outcome measures as proxies for poor functional outcome, we cannot conclude that a significant relationship exists between the occurrence of PCSI or reoperation and changes in functional outcome