1,119 research outputs found
DSN seven day/twelve week schedule program
Deep Space Network scheduling program allocates resources based on the users requirements. The system reviews and allocates the requests for equipment and resources. Depending upon the program input either the seven day or the twelve week schedule is generated
Identification of valid, reliable, discriminating criteria for use in developing evaluation instruments for special education teachers
This study sought to determine discriminating, reliable, and valid criteria to evaluate the performance of special education teachers. Data were collected on criteria to distinguish high performing special education teachers from average and poor performing special education teachers. A sample of over 500 principals/supervisors, teachers, related services personnel, and knowledgeable others was administered a 49-item questionnaire. In addition, the investigation endeavored to determine if appraisers\u27 ability to rate a special education teacher varied according to job assignment. In particular, it tried to verify the ability of typical building principals to make performance evaluation judgments about special education teachers. The study also attempted to determine whether a difference existed between discriminating items for regular and special education teachers. Voluntary participation for the study included 33 special education teachers from school districts located in Arizona, Arkansas, Iowa, Montana, New York, and Nevada. Each of the 33 special education teachers was evaluated by 15 to 18 raters;Results showed that: (1) all 49 of the survey items discriminated or measured differences between the 33 special education teachers at least at the.05 level of significance; (2) performance criteria found to be discriminating for regular education teachers were also able to discriminate for special education teachers; (3) ratings by raters with little or no special education background were not significantly different from raters with certification in special education; (4) effective teacher behaviors in the regular classroom appear to be effective behaviors for the special education teacher; (5) effective behaviors of special education teachers appear to be readily observable by a variety of observers with various backgrounds and training; and (6) regular educators, particularly principals and supervisors, are capable of making valid observations of special education teacher performance;The study also includes a list of 49 performance criteria for special education teachers based on discrimination power that may be used to develop a performance evaluation instrument for special education teachers
Single Parameter Combinatorial Auctions with Partially Public Valuations
We consider the problem of designing truthful auctions, when the bidders'
valuations have a public and a private component. In particular, we consider
combinatorial auctions where the valuation of an agent for a set of
items can be expressed as , where is a private single parameter
of the agent, and the function is publicly known. Our motivation behind
studying this problem is two-fold: (a) Such valuation functions arise naturally
in the case of ad-slots in broadcast media such as Television and Radio. For an
ad shown in a set of ad-slots, is, say, the number of {\em unique}
viewers reached by the ad, and is the valuation per-unique-viewer. (b)
From a theoretical point of view, this factorization of the valuation function
simplifies the bidding language, and renders the combinatorial auction more
amenable to better approximation factors. We present a general technique, based
on maximal-in-range mechanisms, that converts any -approximation
non-truthful algorithm () for this problem into
and -approximate truthful
mechanisms which run in polynomial time and quasi-polynomial time,
respectively
Bundling Equilibrium in Combinatorial auctions
This paper analyzes individually-rational ex post equilibrium in the VC
(Vickrey-Clarke) combinatorial auctions. If is a family of bundles of
goods, the organizer may restrict the participants by requiring them to submit
their bids only for bundles in . The -VC combinatorial auctions
(multi-good auctions) obtained in this way are known to be
individually-rational truth-telling mechanisms. In contrast, this paper deals
with non-restricted VC auctions, in which the buyers restrict themselves to
bids on bundles in , because it is rational for them to do so. That is,
it may be that when the buyers report their valuation of the bundles in
, they are in an equilibrium. We fully characterize those that
induce individually rational equilibrium in every VC auction, and we refer to
the associated equilibrium as a bundling equilibrium. The number of bundles in
represents the communication complexity of the equilibrium. A special
case of bundling equilibrium is partition-based equilibrium, in which
is a field, that is, it is generated by a partition. We analyze the tradeoff
between communication complexity and economic efficiency of bundling
equilibrium, focusing in particular on partition-based equilibrium
Criterion-Referenced Testing for Outcomes-Based Education
The district wanted improved student achievement but not at the expense of low teacher morale, dissatisfied parents, or exploited students
Representations of families of triples over GF(2)
AbstractLet B be any family of 3-subsets of [n] = {1, …, n} such that every i in [n] belongs to at most three members of B. It is shown here that there exists a 3 × n (0, 1)-matrix M such that every set of columns of M indexed by a member of B is linearly independent over GF(2). The proof depends on finding a suitable vertex-coloring for the associated 3-uniform hypergraph. This matrix result, which is a special case of a conjecture of Griggs and Walker, implies the corresponding special case of a conjecture of Chung, Frankl, Graham, and Shearer and of Faudree, Schelp, and Sós concerning intersecting families of subsets
Tidal Synchronization and Differential Rotation of Kepler Eclipsing Binaries
Few observational constraints exist for the tidal synchronization rate of
late-type stars, despite its fundamental role in binary evolution. We visually
inspected the light curves of 2278 eclipsing binaries (EBs) from the Kepler
Eclipsing Binary Catalog to identify those with starspot modulations, as well
as other types of out-of-eclipse variability. We report rotation periods for
816 EBs with starspot modulations, and find that 79% of EBs with orbital
periods less than ten days are synchronized. However, a population of short
period EBs exists with rotation periods typically 13% slower than synchronous,
which we attribute to the differential rotation of high latitude starspots. At
10 days, there is a transition from predominantly circular, synchronized EBs to
predominantly eccentric, pseudosynchronized EBs. This transition period is in
good agreement with the predicted and observed circularization period for Milky
Way field binaries. At orbital periods greater than about 30 days, the amount
of tidal synchronization decreases. We also report 12 previously unidentified
candidate Scuti and Doradus pulsators, as well as a candidate
RS CVn system with an evolved primary that exhibits starspot occultations. For
short period contact binaries, we observe a period-color relation, and compare
it to previous studies. As a whole, these results represent the largest
homogeneous study of tidal synchronization of late-type stars.Comment: Accepted for publication in the Astronomical Journal. EB rotation
periods and classifications available at
https://github.com/jlurie/decatur/blob/master/decatur/data/final_catalog.cs
CMS Software Distribution on the LCG and OSG Grids
The efficient exploitation of worldwide distributed storage and computing
resources available in the grids require a robust, transparent and fast
deployment of experiment specific software. The approach followed by the CMS
experiment at CERN in order to enable Monte-Carlo simulations, data analysis
and software development in an international collaboration is presented. The
current status and future improvement plans are described.Comment: 4 pages, 1 figure, latex with hyperref
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