291 research outputs found

    The effects of glare and inhomogeneous visual fields on contrast detection in the context of driving

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    An experiment was carried out to investigate how contrast threshold for target detection is affected by the presence of glare and by extraneous light sources using the method of ascending limits. The target was located at either a foveal or a peripheral (10° right) location, glare was adjacent to the foveal location, simulating the headlamps of an oncoming vehicle, and extraneous light sources were at either foveal or peripheral (10° right or left) locations. Contrast threshold for a foveal target without glare was affected mainly by the surrounding local luminance distribution. However, in the presence of glare and also for the peripheral target (both with and without glare) the global luminance distribution matters. Glare increased the contrast needed for detection of the foveal target, but this effect was reduced by the presence of extraneous light sources that were peripheral to the target. For peripheral targets, contrast threshold was also reduced by the presence of extraneous light at a non-target location and this effect was increased in the presence of glare. Glare equations tend to be based on tests using uniform, homogenous fields: these data indicate that, in the presence of extraneous light sources, the influence of glare is overestimated.BMBF, 13N10815, Messung und Simulation des photopischen und mesopischen Sehens: Psychophysiologische Maße zur Beurteilung von Beleuchtungseinrichtunge

    TechSat 21 and Revolutionizing Space Missions using Microsatellites

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    The Air Force Research Laboratory (AFRL) TechSat 21 flight experiment demonstrates a formation of three microsatellites flying in formation to operate as a “virtual satellite.” X-band transmit and receive payloads on each of the satellites form a large sparse aperture system. The satellite formation can be configured to optimize such varied missions as radio frequency (RF) sparse aperture imaging, precision geolocation, ground moving target indication (GMTI), single-pass digital terrain elevation data (DTED), electronic protection, single-pass interferometric synthetic aperture radar (IF-SAR), and high data-rate, secure communications. Benefits of such a microsatellite formation over single large satellites include unlimited aperture size and geometry, greater launch flexibility, higher system reliability, easier system upgrade, and low cost mass production. Key research has focused on the areas of formation flying and sparse aperture signal processing and been sponsored and guided by the Air Force Office of Scientific Research (AFOSR). The TechSat 21 Program Preliminary Design Review (PDR) was held in April 2001 and incorporated the results of extensive system trades to achieve a light-weight, high performance satellite design. An overview of experiment objectives, research advances, and satellite design is presented

    Strength and conditioning for professional boxing: recommendations for physical preparation

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    Professional boxing is a popular pan-global sport that attracts considerable interest and revenue. It is a high-intensity sport that requires a range of well-adapted physiological characteristics as likely prerequisites for successful performance. Serious consideration has been given to medical aspects and potential health risks from partaking in training and competition. However, there are no comprehensive sources of applied sport science research in the preparation of professional boxers for competition. In this review, we present research from physiology and strength and conditioning to form a knowledge base for those involved in preparing professional boxers for competition

    Status of Transferring NASA's Terminal Sequencing and Spacing Technologies to the FAA

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    This paper provides a brief overview of the Air Traffic Management Technology Demonstration 1 (ATD-1) technologies. These technologies are comprised of ground-based automation tools and airborne automation tools. The ground-based automation tools are referred to as terminal sequencing and spacing (TSS). NASA is currently maturing TSS prior to transfeering it to the FAA. This paper discusses the status of the transfer

    Исследование изотопного эффекта процесса кристаллизации из водного раствора в магнитном поле

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    Выпускная квалификационная работа проводилась с целью экспериментального исследования изменения изотопного эффекта процесса кристаллизации из водного раствора во внешнем постоянном магнитном поле. Для проведения исследований использовали насыщенный раствор NaCl. Раствор заливали в колбы Бунзена, из которых откачивался воздух с помощью вакуумного насоса. На одну из колб действовали постоянным магнитным полем. Кристаллы отбирали, высушивали и проводили рентгенодифракционный анализ.Final qualifying work was carried out with the aim experimental researches of change of isotopic effect of the process of crystallization from the aqueous solution in an external constant magnetic field. A saturated solution of NaCl was prepared for the studies. The solution was poured his flask Bunsen, of which the suction air using a vacuum pump. One of the flasks operated permanent magnet. The crystals were selected, dried and gave to x-ray diffraction analysis

    On modelling and verifying railway interlockings: Tracking train lengths

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    The safety analysis of interlocking railway systems involves verifying freedom from collision, derailment and run-through (that is, trains rolling over wrongly-set points). Typically, various unrealistic assumptions are made when modelling trains within networks in order to facilitate their analyses. In particular, trains are invariably assumed to be shorter than track segments; and generally only a very few trains are allowed to be introduced into the network under consideration. In this paper we propose modelling methodologies which elegantly dismiss these assumptions. We first provide a framework for modelling arbitrarily many trains of arbitrary length in a network; and then we demonstrate that it is enough with our modelling approach to consider only two trains when verifying safety conditions. That is, if a safety violation appears in the original model with any number of trains of any and varying lengths, then a violation will be exposed in the simpler model with only two trains. Importantly, our modelling framework has been developed alongside - and in conjunction with - railway engineers. It is vital that they can validate the models and verification conditions, and - in the case of design errors - obtain comprehensible feedback. We demonstrate our modelling and abstraction techniques on two simple interlocking systems proposed by our industrial partner. As our formalization is, by design, near to their way of thinking, they are comfortable with it and trust it

    Expanding Fix Patterns to Enable Automatic Program Repair

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    Automatic Program Repair (APR) has been proposed to help developers and reduce the time spent repairing programs. Recent APR tools have applied learned templates (fix patterns) to fix code using knowledge from fixes successfully applied in the past. However, there is still no general agreement on the representation of fix patterns, making their application and comparison with a baseline difficult. As a consequence, it is also difficult to expand fix patterns and further enable APR. We automatically generate fix patterns from similar fixes and compare the generated fix patterns against a state-of-the-art taxonomy. Our automated approach splits fixes into smaller, method-level chunks and calculates their similarity. A threshold-based clustering algorithm groups similar chunks and finds matches with state-of-the-art fix patterns. In our evaluation, we present 33 clusters whose fix patterns were generated from the fixes of 835 Defects4J bugs. Of those 33 clusters, 22 matched a state-of-the-art taxonomy with good agreement. The remaining 11 clusters were thematically analysed and generated new fix patterns that expanded the taxonomy. Our new fix patterns should enable APR researchers and practitioners to expand their tools to fix a greater range of bugs in the future

    Prospectus, October 26, 1973

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    STAFF PROFILES; Trustees Welcome Stugo President Kendricks To Board; Chills Highlight Haunted House; Only Two Of Seven Amendments Pass, Original Report Incorrect; Prospectus In Perspective: Impeachment Now; The Short Circuit; Cruisin\u27 \u2773; Senator Hulsizer Asks For Student Involvement; Letters From Our Readers; To the Faculty of Parkland College; Bowling Bulletin Board; Death By Hunger; TARGET Explained At Open House; Behind The Books; Scott I Deal With The Issues ; Human Development Seminar Slated; The History Of The Controversial Film - Salt Of The Earth ; S.W.A.M.P. Not A Fad; News Bulletin; Allman Bros. Come Through On Brothers and Sisters; Johnson We Take The Student Where He Is, and Build On That ; Campus Continues To Be Completed; Pre-Registration Additional Info; Mutt and Mortie; Leaders To Meet At Allerton This Saturday, Sunday; Debaters Shows Strength At Bradley Tourney; Health Center Free Clinic; Day Senators Outline Platforms; Slave Auction, Dance Today; President Releases Tapes; Marshall Wins PCFW Scholarship; A\u27s Repeat As World Champs, Dump N.Y. Mets In Seven Games; Wrist-Wrestling, Frisbie Contests To Be Held Soon; Monday\u27s Coach; Harriers Lose Flores Burnette, Will Run In Region IV Finals On Saturday, October 26; Fast Freddy\u27s Football Forecast; Fast Freddy Pays In Cash, Too; Female Winner Of Fast Freddy; Classified Ads; Champaign To Pick Up Leaves; Masters\u27 \u27Spoon River\u27 Comes To Parkland; A Column By And For Women; What The Signs Say; W. Virginia U. Hires Attorney; Who Will Listen?; Final Exam Schedule - Fall Quarter; Callboard; Sharing Group Recommends Eighthttps://spark.parkland.edu/prospectus_1973/1003/thumbnail.jp

    Prospectus, November 9, 1973

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    FORD - OUR NEXT PRESIDENT?; Faculty, Staff Evaluations Adopted As College Policy; Fellowships For Women Announced; Student Senate Vice-President Resigns Post; Debaters Take Third At IVC Meet; Vandalism Suspected In Fire; Parkland To Participate In Conference; Declaration Of Impeachment; Prospectus In Perspective; Letters From Our Readers; Student Opinion Survey; President\u27s Comment; The Short Circuit; Behind The Books; Counselors And Question Marks; Zindars Shares Her Experiences; $6 Bid Tops In Vets Dance, Slave-Auction; UFO\u27s: Citizens Vs. Air Force; The Pinkertons Are At Parkland; Allied Health Program; November Student Activities Parkland College; American Assoc. Of Univ. Women Host General Meeting Nov. 11; Peterson Addresses Phi Beta Lambda; PLATO Popular With Students, Teachers; Cycle Mishap Injures One; Road Rally; Mutt and Mortie; Evening Program Diversified Next Quarter At P/C; Geology Flight Delayed; Final Exam Schedule - Fall Quarter; Costs At School Dominate P.C.A. Senate Meeting; \u27Passion Play\u27 Not Dull; P/C Gen. Biology-Pollution, Genetics Other Relevant Topics; No Grease-Monkey Graduatess At Parkland; Campus Leaders Exchange Ideas at Allerton Meeting; Parkland Co-Hosts Veterans Conference; TB Examinations; Classified Ads; A Column By And For Women: Originality, The Cell; Monday\u27s Coach; Jim Redman, Jane Hawthorne Grab Parkland\u27s First Road Rally; Football Finals To Be Held Tuesday; Fast Freddy\u27s Football Forecast; WVLJ Plans Broadcasts Of PC Basketball; Thompson Wins Fast Freddy As Upsets Abound; Local Volunteer Suggests Grants; Lost And Found; Earle, Seger Go To N.J.C.A.A. Nationals; Parkland Cagers Start Practice For Nov. 29 Debut With Millikin; Wrestlers Open Workouts, Seven Spots Open On 10-Man Roster; Parkland College Basketball Schedule 1973-74; Parkland College Wrestling Schedule 1973-74; Bowing Bulletin Board; Callboard; Changes In Calendar, Staff Status, Registration Proposed; Cade Re-elected Board Chairmanhttps://spark.parkland.edu/prospectus_1973/1002/thumbnail.jp

    Monitoring Deformation in Graphene Through Hyperspectral Synchrotron Spectroscopy to Inform Fabrication

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    The promise from graphene to produce devices with high mobilities and detectors with fast response times is truncated in practice by strain and deformation originating during growth and subsequent processing. This work describes effects from graphene growth, multiple layer transfer, and substrate termination on out of plane deformation, critical to device performance. Synchrotron spectroscopy data was acquired with a state-of-the-art hyperspectral large-area detector to describe growth and processing with molecular sensitivity at wafer length scales. A study of methodologies used in data analysis discouraged dichroic ratio approaches in favor of orbital vector approximations and data mining algorithms. Orbital vector methods provide a physical insight into mobility-detrimental rippling by identifying ripple frequency as main actor, rather than intensity; which was confirmed by data mining algorithms, and in good agreement with electron scattering theories of corrugation in graphene. This work paves the way to efficient information from mechanical properties in graphene in a high throughput mode throughout growth and processing in a materials by design approach
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