Range residuals in VHF radar tracking

Range residuals of very high frequency radar tracking data of ionospher

An {l1,l2,l∞}\{l_1,l_2,l_{\infty}\}-Regularization Approach to High-Dimensional Errors-in-variables Models

Several new estimation methods have been recently proposed for the linear regression model with observation error in the design. Different assumptions on the data generating process have motivated different estimators and analysis. In particular, the literature considered (1) observation errors in the design uniformly bounded by some $\bar \delta$, and (2) zero mean independent observation errors. Under the first assumption, the rates of convergence of the proposed estimators depend explicitly on $\bar \delta$, while the second assumption has been applied when an estimator for the second moment of the observational error is available. This work proposes and studies two new estimators which, compared to other procedures for regression models with errors in the design, exploit an additional $l_{\infty}$-norm regularization. The first estimator is applicable when both (1) and (2) hold but does not require an estimator for the second moment of the observational error. The second estimator is applicable under (2) and requires an estimator for the second moment of the observation error. Importantly, we impose no assumption on the accuracy of this pilot estimator, in contrast to the previously known procedures. As the recent proposals, we allow the number of covariates to be much larger than the sample size. We establish the rates of convergence of the estimators and compare them with the bounds obtained for related estimators in the literature. These comparisons show interesting insights on the interplay of the assumptions and the achievable rates of convergence

FAME, a microprocessor based front-end analysis and modeling environment

Higher order software (HOS) is a methodology for the specification and verification of large scale, complex, real time systems. The HOS methodology was implemented as FAME (front end analysis and modeling environment), a microprocessor based system for interactively developing, analyzing, and displaying system models in a low cost user-friendly environment. The nature of the model is such that when completed it can be the basis for projection to a variety of forms such as structured design diagrams, Petri-nets, data flow diagrams, and PSL/PSA source code. The user's interface with the analyzer is easily recognized by any current user of a structured modeling approach; therefore extensive training is unnecessary. Furthermore, when all the system capabilities are used one can check on proper usage of data types, functions, and control structures thereby adding a new dimension to the design process that will lead to better and more easily verified software designs

Reforming Local Property for an Era of National Decline

Following a century of rapid growth, the global human population is predicted to crest and then decline in the coming generations. Some industrialized countries are already grappling with the economic and societal consequences of population loss. Others, including the United States, have only started to realize that decline might arrive on their doorsteps far sooner than originally anticipated, a prospect for which policymakers and legal scholars are presently unprepared. Global and national demographic change threaten to cause far-reaching dislocations, and local municipalities, too, will be asked to reckon with the aftermath. Yet local governance in the United States has long followed a dominant vision of population growth, with decline left stigmatized as a regional anomaly—as a symptom of crisis rather than a discrete catalyst for it. The growth gospel prevents local officials from preparing for decline preemptively when the resources can still be mustered to confront shifting demographics and dwindling tax streams. On the other hand, once a locality enters an era of decline, it runs headlong into vexing problems of property law. Underutilized land cannot simply be deleted or removed. It cannot be exchanged with utilized lands elsewhere in order to retain density, maintain vibrancy, and consolidate local infrastructure. As scholars have explored in the context of climate change, another looming challenge of the coming century, property law’s traditional preference for intergenerational stability hinders its utility when preparing for a changing world. Keeping pace requires that the institution evolve to become more adaptive and dynamic. Drawing upon recent property theory, this Article advocates for a reconfigured tenure form, the callable fee simple, which can be harnessed to create a new intergenerational mechanism for population decline: Future Consolidation Districts, or FCDs. After sketching the contours of an FCD, the Article explores how one could be created in a manner that provides flexibility to tackle future demographic dislocations, overcome implementation and equity challenges, and comport with existing local government and property norms, even while pushing the limits of both. Although today’s demographic forecasts may ultimately prove inaccurate, existing regimes cannot, and will not, remain static forever. They should be reconfigured deliberatively in advance rather than by necessity down the road

Confronting the Local Land Checkerboard

Fractured public land is hidden in plain sight. In communities across the country, a patchwork assortment of local governments share splintered ownership over surplus public properties, which can be found scattered in residential neighborhoods and alongside highways, in the shadows of development projects and in the scars of urban renewal. The ripple effect of this fragmentation extends across the spectrum of local governance. It creates needless costs and bureaucratic headaches at a time of acute fiscal distress for cities and counties. It contributes to an inequitable imbalance of local power between formal and informal landowners in a community. And curiously, the operative legal regime enables the problem while simultaneously muddying pragmatic ways to confront it. This Article seeks to shed light upon the local land checkerboard— and in doing so, the cluttered and opaque world of local government law that it inhabit

Divorce Law—Defective Mexican Divorce Decree Accorded New York Recognition Due to Subsequent Appearance, Through an Attorney, of Party Absent from the Mexican Action

Ramm v. Ramm, 34 App. Div. 2d 667, 310 N.Y.S.2d 111 (2d Dep\u27t 1970)

Interlocal Power Roulette

Local governments inhabit a crowded ecosystem. Cities, counties, and school districts—and many more—share overlapping territorial jurisdictions. Overlapping jurisdiction goes hand-in-hand with redundant local power, defined as a scenario where multiple governments hold independent authority to take the exact same action in the exact same territorial space. In Maine, for example, state law empowers three local bodies to operate the same sewer infrastructure. In Detroit, two separate entities are equally tasked with managing the city’s streetlights. And in communities across the country, local governments are broadly authorized to own the same parcels of public land, including in Oakland, California, where public properties are splintered between a grand total of fifteen different government bodies. How do localities navigate their shared powers in a shared governance ecosystem? In the absence of state guidance, local governments fashion ad hoc, largely circumstantial, and often informal regimes of interlocal power. Sometimes they compete with each other to control a public asset, while at other times they coordinate and exercise power in a joint manner. Sometimes they abstain from acting, on the hope or expectation that another local entity will take the lead, and at other times they bandwagon onto the governance decisions of another body. Rarely are these relationships set in stone. Instead, a relationship built on collaboration may devolve suddenly into competition, while even written agreements that delineate how two governments will exercise their redundant powers can prove illusory on the ground. Uncertainty reigns supreme in this interstitial universe, yielding an interlocal governance haze that this Article aims to highlight and moderate. The Article demonstrates why redundant and muddled power is so common, how it manifests in practice, and why state legislatures generally take a hands-off approach to the issue. Yet as it also demonstrates, legislatures sometimes do intervene, at times aggressively, to reorder interlocal power in pursuit of substantive policies or particular political goals. Intergovernmental power dynamics can thus lurch between the polar nodes of local indeterminacy and haphazard, state-imposed change. To break the impasse, this Article considers a counterintuitive strategy for local government officials: proactively asking the state to limit their power by creating an administrative oversight framework where none currently exists. Such a framework would enhance local democracy by shedding sunlight on conversations that today often occur in the shadows. It could also carve a middle-ground approach between the well-trod and often politically-fraught poles of state fiat and local autonomy, one where, instead, local actors can pursue a procedural initiative today to ward off unpredictable state interventions down the road

Ionospheric perturbations on STADAN VHF tracking accuracy

Ionospheric perturbations on STADAN very high frequency tracking accurac