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1
Erickson, Caitlin. "Tilt". DigitalCommons@USU, 2014. https://digitalcommons.usu.edu/etd/3567.
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This thesis is a memoir that explores the evolution and disintegration of two major relationships in my life, one insidious, the other toxic, as well as the factors that led to those relationships. The first two chapters explore my relationship with Adam, a twenty-one-year-old man who forced his way into my heart, while the final chapters navigate the relationship with my college boyfriend and ex-fiance, Cameron, as well as the aftermath and slow path toward healing after his departure. The two sections are divided by a middle chapter that shows moments in my childhood that, while small, signify powerful messages about what it meant to fit in and be accepted in my world. Altogether, this thesis explores the idea of trauma. While many other memoirs touch on the same theme, my thesis differs in the type of trauma experienced, particularly in the relationship with Adam. Statutory rape is rarely talked about, and when it is, it seems to be met with derision, condemnation, and marginalization. The speaker in my thesis does not take the stance of a victim or a perpetrator, but as someone who is confused about the situation and how she feels, particularly in relation to how others tell her how she should feel. As the memoir progresses, the speaker has to grapple how to find her own voice after she's been silenced her entire life.
2
Suorsa, H. (Henri). "Kolme tilaa musiikille". Master's thesis, University of Oulu, 2018. http://urn.fi/URN:NBN:fi:oulu-201805311970.
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Diplomityössäni olen tutkinut arkkitehtuurin ja musiikin suhdetta. Työn ytimenä on suunnitelma uudesta julkisesta musiikkirakennuksesta Oulun keskustan edustalla sijaitsevaan Linnansaareen. Suunnitelmaa taustoittaa työn kirjallinen osa, joka on jaettu temaattisesti kahteen lukuun. Työn ensimmäinen luku käsittelee arkkitehtuurin ja musiikin vuorovaikutusta ja toisiinsa linkittynyttä historiaa, sekä akustiikan roolia välittävänä rajapintana. Lisäksi luvussa tutkitaan lähtökohtia musiikin tilojen suunnittelulle ja avataan sitä kautta myös tämän työn suunnitteluprosessia. Työn toisessa luvussa tarkastellaan Linnansaarta miljöönä ja erityisesti saaren keskeistä merkitystä Oulun historiassa. Linnansaari tunnetaan historiallisen Oulun linnan sijaintina, mutta tavoitteenani oli myös laajemmalti ymmärtää paikan henkeä sekä eritellä sen toiminnallisia tekijöitä suunnittelun lähtökohdaksi. Diplomityön kolmannessa luvussa esitellään suunnitelma uudesta musiikkirakennuksesta Linnansaareen. Rakennukseen kuuluu kolme eri musiikkityyleille suunnattua, akustiikaltaan erilaista esitystilaa. Puurakenteisen arkkitehtuurin lähtökohtana on luoda harmoninen kokonaisuus sekä teatterin ja kirjaston muodostaman monumentaalikeskustan, että Pikisaaren sympaattisen puukaupunki-idyllin kanssaIn this thesis I have studied the relationship of architecture and music. The body of the work consists of a design of a new public music building on the isle of Linnansaari, Oulu. The design is backgrounded with a literary part, which consists of two thematically divided chapters. The first chapter examines the intertwined history of music and music architecture. The primary objective is to investigate what the architect should know about acoustics when designing spaces for music — and how this theoretical basis can be used to influence the design process positively. In the second chapter Linnansaari is studied as a setting, and its central role in the history of Oulu is reflected: the isle is the location of a historical castle, of which only ruins remain. The aim is to understand the genius loci of Linnansaari, and to analyse its characteristics and functional aspects to form a solid starting point for the design task. The third chapter presents the design of a new building for music, containing three separate performance spaces with different acoustical profiles. The structural system and most of the surfaces are made of wood. The goal was to create a harmonious whole both with the nearby monumental cultural buildings and with the small scale wooden architecture of the nearby Pikisaari
3
Tiusanen, I. (Iita). "Biodiversiteetin tila Suomessa". Bachelor's thesis, University of Oulu, 2016. http://urn.fi/URN:NBN:fi:oulu-201605051651.
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Luonnon monimuotoisuus heikkenee maailmanlaajuisesti. Ihminen on käynnistänyt ns. kuudennen sukupuuttoaallon, minkä vaikutukset näkyvät myös Suomen lajistossa. Viimeisen 15 vuoden aikana Suomen lajiston uhanalaistumiskehityksen voidaan katsoa olleen kokonaisuudessaan kielteistä. Joidenkin lajien tilanne on parantunut, mutta suuremmalla osalla lajeista kehitys on ollut negatiivista. Tärkeimpinä syinä tälle kehitykselle voidaan pitää metsäelinympäristöissä tapahtuvia muutoksia, erityisesti vanhojen metsien häviämistä, perinneympäristöjen ja muiden avoimien ympäristöjen sulkeutumista sekä muuta maankäyttöä, joka tuhoaa ja pirstouttaa elinympäristöjä. Ilmastonmuutos nähdään merkittävänä tulevaisuuden uhkana, vaikka sen ei uskotakaan vielä vaikuttaneen kuin muutaman Suomalaisen lajin uhanalaistumiseen. Hyvin suunnitellut ja toteutetut luonnonsuojelualueet edistävät luonnon monimuotoisuuden suojelua. Lisäksi luonto on otettava huomioon kaikessa suojelualueiden ulkopuolisessa toiminnassa. Jotta luonnonsuojelu olisi onnistunutta, tarvitaan myös tietoa, jota saadaan esimerkiksi tutkimuksesta ja seurannoista.
4
Crompton, Richard E. "Tilt-up construction". Thesis, Gainesville, Florida : University of Florida, 1992. http://handle.dtic.mil/100.2/ADA250778.
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Thesis (Master of Engineering)--University of Florida, 1992."Spring 1992." Description based on title screen as viewed on April 7, 2009. Includes bibliographical references (p. 64). Also available in print.
5
Dyba, Tadeusz. "Precision of cancer incidence predictions based on poisson distributed observations". Helsinki : University of Helsinki, 2000. http://ethesis.helsinki.fi/julkaisut/val/tilas/vk/dyba/.
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Heinävaara, Sirpa. "Modelling survival of patients with multiple cancers". Helsinki : University of Helsinki, 2003. http://ethesis.helsinki.fi/julkaisut/val/tilas/vk/heinavaara/.
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French, Anton. "Tilt-up Panel Investigation". Thesis, University of Canterbury. Master of Engineering Management, 2014. http://hdl.handle.net/10092/8944.
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The aim of this report is to investigate the ductile performance of concrete tilt-up panels reinforced with cold-drawn mesh to improve the current seismic assessment procedure. The commercial impact of the project was also investigated. Engineering Advisory Group (EAG) guidelines state that a crack in a panel under face loading may be sufficient to fracture the mesh. The comments made by EAG regarding the performance of cold-drawn mesh may be interpreted as suggesting that assessment of such panels be conducted with a ductility of 1.0. Observations of tilt-up panel performance following the Christchurch earthquakes suggest that a ductility higher than μ=1.0 is likely to be appropriate for the response of panels to out-of-plane loading. An experimental test frame was designed to subject ten tilt-panel specimens to a cyclic quasi-static loading protocol. Rotation ductility, calculated from the force-displacement response from the test specimens, was found to range between 2.9 and 5.8. Correlation between tensile tests on 663L mesh, and data collected from instrumentation during testing confirmed that the mesh behaves as un-bonded over the pitch length of 150mm.
Recommendation:
Based on a moment-rotation assessment approach with an un-bonded length equal to the pitch of the mesh, a rotation ductility of μ=2.5 appears to be appropriate for the seismic assessment of panels reinforced with cold-drawn mesh.
8
Lee, Yongho [Verfasser]. "Development of an advanced tilt actuator for tilt-to-length coupling investigations / Yongho Lee". Hannover : Gottfried Wilhelm Leibniz Universität, 2021. http://nbn-resolving.de/urn:nbn:de:101:1-2021093002165433981052.
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Remes, H. (Heini). "Valikoiva metsästys ja riistaeläinpopulaatioiden tila". Bachelor's thesis, University of Oulu, 2017. http://urn.fi/URN:NBN:fi:oulu-201708302771.
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Metsästysharrastus on johtanut vaihtelevista syistä valikoivaan metsästykseen ts. jonkin ominaisuuden suosimiseen verotuksessa. Tällainen metsästystapa keskittyy esim. ennalta määriteltyihin sukupuoli- ja ikäryhmiin sekä yksilöihin, joten sillä on mm. elinkiertoon ja populaatioiden kasvuun väistämättömiä vaikutuksia.
Tässä tutkielmassa käsitellään, mitä on valikoiva metsästys, kuinka se vaikuttaa riistaeläinpopulaatioihin ja pitäisikö metsästyksen ihmislähtöisen valikoivuuden sijaan jäljitellä luonnollista kuolevuutta.
10
Mäkinen, J. M. (Juha-Matti). "Flow-tila elektronisten laitteiden käytössä". Master's thesis, University of Oulu, 2017. http://urn.fi/URN:NBN:fi:oulu-201710112982.
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Flow-tila on mielentila, jossa henkilö on uppoutunut suorittamaansa aktiviteettiin energisellä tavalla. Sen ominaisuuksiin kuuluvat erityisesti syventyminen ja nautinnollisuus. Flow-tilan huomaa mm. siitä, että henkilö on kokonaan syventynyt aktiviteettiinsa ja menettänyt ajantajunsa. Tutkimuksen tarkoituksena oli tutkia erityisesti flow-tilan vaikutuksia elektronisten laitteiden käytössä, ja miten flow-tila koetaan yksilöllisellä tasolla elektronisten laitteiden kanssa työskenneltäessä. Aluksi tehtiin katsaus aikaisemmista flow-tiloja käsittelevistä tutkimuksista. Katsauksen pohjalta valittiin kriteerit, kategoriat ja tutkimuksessa käytetyt työkalut. Tutkimus tehtiin seuraten laadullisen tapaustutkimuksen periaatteita, hyödyntäen aineistonkeruussa haastattelua ja dokumenttien tutkimista. Tätä lähestymistapaa sovellettiin tutkimukseen ensin aikaisemmista tapaustutkimuksista. Aiemmista tapaustutkimuksista mallia ottamalla saatiin aikaan tutkimuksen käyttämä lähestymistapa. Aineistoa tutkimukseen kerättiin tutkimukseen valittujen tutkimuksen osanottajien haastatteluilla, tarkkailulla ja itseraportointidokumenttien tutkimisella. Lopuksi kerrottiin tutkimuksen tuloksista ja esitettiin mahdollisia tutkimuskysymyksiä jatkotutkimuksille, pohjautuen tutkimuksen aikana tehtyihin havaintoihin. Tutkimuksen vastaukseksi saatiin esille flow-tilan vaikutuksia elektronisten laitteiden käytössä, ja miten flow-tila koettiin yksilöllisellä tasolla. Tutkimuksessa käytettiin aiempiin tutkimuksiin perustuvaa määritelmää flow-tilan vaatimuksista, ominaisuuksista ja seuraamuksista. Vaatimukset: Haasteiden ja taidon tasapaino, haastavuus, nopea palaute, usko omaan kykyyn vastata haasteeseen, tulosten näkyvyys, haasteiden ja taitojen nouseminen. Ominaisuudet: äärimmäinen keskittyminen, muiden aatteiden kadottaminen, tekojen ja tietoisuuden yhdistyminen, ajantajun kadottaminen, positiivinen kokemus, nautinnollisuus. Negatiiviset ominaisuudet: Harhautuminen, ajantuhlaus, riippuvuus, mahdollista kokea antisosiaalisessa kontekstissa. Seuraamukset: parantunut oppiminen, teknologian käytön parantuminen, parempi työmotivaatio, tutkiva käytös. Tutkimuksen tarkoituksena oli tutkia vaikutuksia. Tutkielman loppuvaiheessa havainnoitiin seuraavia positiivisia vaikutuksia: Positiiviset: Syvä keskittyminen, parantunut motivaatio, nautinnollisuus, parantunut käyttökokemus, parantunut suorituskyky, parantunut oppiminen, ajantajun hämärtyminen, muiden ajatusten kadottaminen, positiivinen yksilöllinen kokemus. Tutkimuksessa havainnoitiin myös negatiivisia vaikutuksia: Turhautuminen, antisosiaalisuus, ajantuhlaus, havainnoinnin heikkeneminen, aggressio, tärkeiden asioiden unohtaminen, riippuvuus, riippuvuuden kehitys. Tutkimuksen tarkoituksia varten ominaisuudet ja seuraamukset yhdistettiin vaikutuksiksi, joista saatiin flow-tilan vaikutukset elektroniikan käytössä esille. Tutkimuksessa todettiin flow-tilan tapahtuvan elektronisten laitteiden käytössä, mutta siihen pääsemisen kriteerit olivat enemmän henkilöiden mielestä ja havainnoinnista riippuvaisia. Tutkimuksessa päädyttiin siihen tulokseen, että havaittiin samojen sääntöjen pätevän flow-tilaan käytettäessä elektronisia laitteita, kuin muissakin aktiviteeteissa, joissa flow-tiloja on aiemmissa tutkimuksissa havainnoitu.
11
Bingaman, Adam Neal. "Tilt-Compensated Magnetic Field Sensor". Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/33295.
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Motion and tilt have long hindered the accuracy, reliability, and response of magnetic detection systems. Perturbations in the magnetic field reading resulting from motion cause degradation of the output signal, compromising the performance and reliability of the magnetometer system.
The purpose of this document is to describe the development, construction, and testing of a tilt-stabilized three-axis magnetic field sensor. The sensor is implemented as a three-axis general-purpose magnetic field sensor, with the additional capability of being implemented as a compass. Design and construction of system hardware is discussed, along with software development and implementation.
Finite impulse response filters are designed and implemented in hardware to filter the acquired magnetic signals. Various designs of median filters are simulated and tested for smoothing inclination signal irregularities and noise. Trigonometric conversions necessary for tilt-compensation are calculated in software using traditional methods, as well as the Coordinate Rotation Digital Computer (CORDIC) algorithm. Both calculation methods are compared for execution time and efficiency.
Successful incorporation of all design aspects leads to detection and output of stable earth magnetic fields, sinusoidal signals, and aperiodic signatures while the magnetometer system is subject to significant tilt motion. Optimized system execution time leads to a maximum detectable signal bandwidth of 410 Hz. Integration of azimuth angle calculation is incorporated and is successfully tested with minimal error, allowing the system to be used as a compass.
Results of the compensated system tests are compared to non-compensated results to display system performance, including tilt-compensation effectiveness, noise attenuation, and operational speed.
Master of Science
12
Zhu, Minhua. "Liquid crystal tilt control and consequences /". online version, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=case1159556235.
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Svensson, Jonas. "AUTOMATISK PAN/TILT-KONTROLLER FÖR ANTENNINRIKTNING". Thesis, Jönköping University, JTH, Computer and Electrical Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-12197.
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This report describes the design and construction of a prototype that automatically aims a microwave link towards a target. The link, that is located on a mobile aerial mast, is used by Saab Training Systems as a part of an infrastructure network. The report also discusses the development of a GUI that communicates with the control unit by Bluetooth.
The control unit, called Pan/Tilt-controller, controls the position of the link by stepping motors. One motor controls the azimuth angle and the other one controls the elevation angle.
By a GUI the operator enters the coordinates on its own position and the targets position. Hereafter a bearing is calculated and it will be sent up to the control unit.
The control unit will sense its own direction by a magnetic sensor that works as an electronic compass. The Pan/Tilt-controller will then rotate the link to reach the targets coordinates. Alternatively you can control the position of the link manually by the GUI.
The report also discusses the functionality of the sensors and tests have been conducted to determine the accuracy of the control unit. The Pan/Tilt-controller can rotate a link 360º around its own axis and also tilting the link ±90º. The Pan/Tilt-controller can direct a link towards a target with an accuracy of 5º -10º.
14
Chen, Leiming. "Tilt phase transitions in disordered systems /". view abstract or download file of text, 2006. http://proquest.umi.com/pqdweb?did=1251884301&sid=1&Fmt=2&clientId=11238&RQT=309&VName=PQD.
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Thesis (Ph. D.)--University of Oregon, 2006.Typescript. Includes vita and abstract. Includes bibliographical references (leaves 126-128). Also available for download via the World Wide Web; free to University of Oregon users.
15
Pansell, Tony. "Ocular counter-rolling during head tilt /". Stockholm, 2003. http://diss.kib.ki.se/2003/91-7349-598-0/.
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Chiu, M. E. "Tilt the molecule – change the chemistry". Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.597622.
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The aim of this course of research was to further our knowledge of the mechanism of catalysts at the molecular level – thence, to form predictions and suggestions toward rational catalyst design. The first part of this work deals with catalysis on silver. Although well-known in selective oxidation, the potential of silver for chemoselective hydrogenation was only recently realised. Here, the hydrogenation of acrolein and crotonaldehyde was studied in ultra-high vacuum on the Ag(111) model catalyst. The delicate hydrogenation of both aldehydes to the desired unsaturated alcohol was demonstrated for the first time by temperature programmed reaction (TPR). X-ray photoelectron spectroscopy (XPS) and near edge X-ray absorption fine structure (NEXAFS) showed unambiguously that the orientation of the C=C and C=O bonds with respect to the surface critically influences the outcome of the hydrogenation reaction. Using a similar approach, the hydrogenation chemistry of crotonaldehyde was studied on sulphur-modified Cu(111), to rationalise why sulphur enhances the selectivity of practical copper catalysts in the hydrogenation of crotonaldehyde to crotyl alcohol. The presence of sulphur (normally a poison) transformed the otherwise inert Cu(111) surface into an excellent catalyst for crotyl alcohol formation. A combination of TPR, XPS and NEXAFS showed that once again, the geometry of the adsorbed aldehyde was crucial in determining selectivity. In this case, the chemoselective reaction itself was observed not just by TPR, but also in situ by XPS and NEXAFS. The final Chapter of this thesis describes a significant breakthrough in chemoselective hydrogenation: the first demonstration of chemoselective hydrogenation of an α,β-unsaturated ketone under ultra-high vacuum conditions. Here, results from ultra-high vacuum experiments are used to make a direct prediction of practical catalyst behaviour.
17
Vannella, Filippo. "Learning Methods for Antenna Tilt Optimization". Licentiate thesis, KTH, Reglerteknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-302353.
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The increasing complexity of modern mobile networks poses unprecedented challenges to Mobile Network Operators (MNOs). MNOs need to utilize network resources optimally to satisfy the growing demand of network users in a reliable manner. To this end, algorithms for self-optimization of network parameters are an essential tool to increase network efficiency and reduce capital and operational expense. In particular, the control of the antenna tilt angle in mobile networks provides an effective method for improving network coverage and capacity. In this thesis, we study Remote Electrical Tilt (RET) optimization using learning-based methods. In these methods, the objective is to learn an optimal control policy, adjusting the vertical tilt of base station antennas to jointly maximize network coverage and capacity. Existing learning-based RET optimization methods, mainly rely on trial-and-error learning paradigms that inevitably degrade network performance during exploration phases, or may require an excessively large amount of samples to converge. We address RET optimization in the Contextual Bandit (CB) setting, a powerful sequential decision-making framework that allows to efficiently model and solve the RET optimization problem. Specifically, we focus on two distinct CB settings tackling the above mentioned problems: (i) the offline off-policy learning setting, and (ii) the Best Policy Identification (BPI) setting. In offline off-policy learning, the goal is to learn an improved policy, solely from offline data previously collected by a logging policy. Based on these data, a target policy is derived by minimizing the off-policy estimated risk of the learning policy. In RET optimization, the agent can leverage the vast amount of real-world network data collected by MNOs during network operations. This entails a significant advantage compared to online learning methods in terms of operational safety and performance reliability of the learned policy. We train and evaluate several target policies on real-world network data, showing that the off-policy approach can safely learn improved tilt update policy while providing a higher degree of reliability. In BPI, the goal is to identify an optimal policy with the least possible amount of data samples. We study BPI in Linear Contextual Bandits (LCBs), in which the reward has a convenient linear structure. We devise algorithms learning optimal tilt update policies from existing data (passive learning) or from data actively generated by the algorithms (active learning). For both active and passive learning settings, we derive information-theoretical lower bounds on the number of data samples required by any algorithm returning an approximately optimal policy with a given level of certainty and devise algorithms achieving these fundamental limits. We then show how to effectively model RET optimization in LCBs and demonstrate that our algorithms can produce optimal tilt update policies using much fewer data samples than naive or existing rule-based learning algorithms. With the results obtained in this thesis, we argue that a significant improvement for sample complexity and operational safety can be achieved while learning RET optimization policies in CBs, providing potential for real-world network deployment of learning-based RET policies.QC 20210921
18
Zhu, Minhua. "LIQUID CRYSTAL TILT: CONTROL AND CONSEQUENCES". Case Western Reserve University School of Graduate Studies / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=case1159556235.
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Beck, Stephen. "Full-Scale Tilt Rotor Download Reduction". Thesis, The University of Arizona, 2013. http://hdl.handle.net/10150/293744.
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A large-scale model of a tiltrotor wing and flap was built and tested to determine how the size and spacing of fluidic actuators for active flow control should be scaled up from laboratory size models to aircraft size. Flow control was provided by sweeping jet actuators mounted in the flap follower. Chordwise pressure data was collected through pressure taps located along the model centerline. The maximum flap deflection to which the flow could be attached with actuation was compared to previous experiments on a 10% 3D model. An ideal actuator spacing was found and the momentum coefficient was comparable between the various sized models. These results were used in the design of an industrial wind tunnel-scale model of a wing built for cruise and tiltrotor-like download testing. These tests have shown that actuators located in the flap follower are effective in both the hover and cruise phases of flight.
20
Scott, Ryan. "Characterizing Tilt Effects on Wind Plants". PDXScholar, 2019. https://pdxscholar.library.pdx.edu/open_access_etds/5035.
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Tilting the nacelle of a wind turbine modifies entrainment into the wind plant and impacts total efficiency. Extreme angles can produce flying and crashing wakes where the wake either disrupts entertainment from the undisturbed flow above or is decimated on the ground. The effect of tilt angle on downstream wake behavior was investigated in a series of wind tunnel experiments. Scale model turbines with a hub height and diameter of 12 cm were arranged in a Cartesian array comprised of four rows of three turbines each. Nacelle tilt was varied in the third row from -15° to 15° in chosen 5° increments. Stereo PIV measurements of the instantaneous velocity field were recorded at four locations for each angle. Tilted wakes are described in terms of the average streamwise velocity field, wall-normal velocity field, Reynolds stresses, and mean vertical transport of kinetic energy. Conditional sampling is used to quantify the importance of sweep vs. ejection events and thus downwards vs. upwards momentum transfer. Additionally, wake center displacement and changes in net power are presented and compared to existing models. The results demonstrate large variations in wake velocity and vertical displacement with enhanced vertical energy and momentum transfer for negative tilt angles. Simulation models accurately predict wake deflection while analytic models deviate considerably highlighting the difficulties in describing tilt phenomena. Negative angles successfully produce crashing wakes and improve the availability of kinetic energy thereby improving the power output of the wind plant.
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Bodkin, David Bradley. "Color, tilt, and the Hermann grid illusion /". Adobe Acrobat Reader required to view document, 2008. http://library.neco.edu/theses/BodkinThesisApr08.pdf.
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Tsinko, Egor. "Background subtraction with a pan/tilt camera". Thesis, University of British Columbia, 2010. http://hdl.handle.net/2429/30386.
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Background subtraction is a common approach in computer vision to detect moving objects in video sequences taken with a static camera. Some background subtraction algorithms have been extended to support a pan/tilt camera but they are required to provide a background mosaic for motion estimation purposes. This thesis describes a system that avoids this requirement by separating the motion estimation system and background subtraction system into two separate modules. The first module performs motion compensation by employing a feature based image registration method and the RANSAC algorithm. The second module detects moving objects in rectified image frames using a background subtraction algorithm designed for a static camera.
Three background subtraction algorithms were extended in the course of this project: mixture of Gaussians, non-parametric kernel density estimation and codebook. This thesis demonstrates the usefulness of separating of motion estimation from the background subtraction system as it allows us to extend any background subtraction algorithm designed for a static camera to support a pan/tilt camera. The detection results are presented for both indoor and outdoor video sequences taken with a pan/tilt camera.
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Soykasap, Omer. "Aeroelastic optimization of a composite tilt rotor". Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/11823.
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Perfect, Philip St John. "Optimising handling qualities for tilt rotor aircraft". Thesis, University of Liverpool, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.533949.
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The development of civil tilt rotor aircraft over the past decade has brought with it new possibilities in terms of mission flexibility and operational capability for both the search and rescue and civil transport roles. However, in their unaugmented state, tilt rotor aircraft exhibit rather poor handling qualities. This research presents potential solutions to these deficiencies. The work has been conducted using simulation models of three differently sized tilt rotor aircraft. Predictive analysis combined with real-time, piloted simulation of the models has allowed detailed assessments of the handling qualities to be conducted. The three models represent the Bell/NASA XV-iS and the Eurocopter Eurotilt and Eurofar design concepts. A full analysis of the unaugmented handling qualities of the aircraft was conducted to inform the subsequent control design. Deficiencies such as poor agility, especially in the roll and yaw axes; low bandwidth; pitch instability at low speeds and a pitch 'dropback' phenomenon were identified as contributing to piloted ratings generally within the Level2/Level 3 region. An investigation of methods by which performance across the whole tilt rotor flight envelope could be improved was conducted. It was determined that, if optimised performance was to be achieved, a full authority controller would be required, especially with a large aircraft such as Eurofar that exhibits very poor agility. 'Unified handling qualities' controllers have been developed for helicopter mode and for the conversion mode, offering identical responses in each model. 'Model following' processes have allowed the desired, Levell, handling qua.ities to be specified. In both cases,the controller was capable of achieving the specified handling qualities for all three aircraft. Piloted simulation confirmed that, in most cases,the handling qualities were as expected. In the conversion mode, a H«J synthesis process was adopted that, in addition to proving the required improvement in handling qualities, simultaneously allowed the controller to act to suppressstructural loads. Operations in a degraded visual environment typically require an attitude response type rather than a rate response type. A controller was therefore developed for Eurofar that conferred an attitude command response, and, taking the level of stabilisation one stage further, a translational rate command response. It is shown that the required level of stability can be achieved through the use of a partial authority controller, but that the improvement in agility is limited, as would be expected. Piloted simulation identified that generally good handling qualities have been achieved for low aggression tasks, with low workload even in severely degraded visual environments. Even with an augmented aircraft, the conversion and reconversion processes remain demanding. This has been addressed through the development of an automatic system that controls the nacelle angle so as to maintain the aircraft at the centre of the conversion corridor. This is complemented by a tracking system to guide the aircraft towards its destination, and so allows a completely automated approach and reconversion as the aircraft returns to its base. An investigation of flight path control of the XV-iS in the conversion mode using H«J synthesis revealed possibilities for simultaneously offering airspeed and flight path response types in the longitudinal/heave axes, despite the inherent cross-coupling difficulties associated with this regime. Overall, tilt rotor handling qualities have been improved across the flight envelope, the aircraft being improved to the extent that Level 1 performance has been attained for the vast majority of low to moderate aggression test manoeuvres in both good and poor visual environments. For more aggressive tasks, the achieved performance is somewhat less satisfactory, although this is primarily limited by the inherent poor agility of the aircraft conferred by their. configuration.
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Childs, Simon. "Active control technologies for tilt-rotor aircraft". Thesis, University of Liverpool, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.442759.
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Dewell, Elizabeth A. (Elizabeth Anderson) 1980. "Tilt bed testing of the subjective horizontal". Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/69235.
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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2002.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references (leaf 25).
Mittelstaedt (1987) suggested that inversion illusions which caused space sickness in astronauts was associated with a net headward bias in the body's gravireceptor organs, which could be measured on Earth using a tilting bed. Mittelstaedt showed that when individual subjects were asked to repeatedly position themselves to the gravireceptive subjective horizontal, individuals showed a small (<5 deg.) but consistent head up or head down bias that remained stable when retested weeks, months or even years later. A correlation with inversion illusion was noted in a small number of astronauts. The purpose of the present project was 1) to construct a new bed of slightly different design and 2) to verify Mittelstaedt's findings using a different subject population. Nine subjects each lay on their left side with their head immbobilized using a bite bar. They positioned the bed (and themselves) at the subjective horizontal ten successive times starting from standardized initial tilt angles which ranged from +/- 10 degrees. Tests were then repeated on right side. Four subjects returned a day later for retesting. Results showed that subjects repeatedly positioned themselves at their own subjective gravitational horizontal, which differed from true horizontal by several degrees a head down direction. Results of tests on the left and right side had similar means for most of the nine subjects; however 4 were statistically different. Left and right sides were combined, noting the above error. Mean biases in the subjective horizontal varied from -3.26 to -0.82 degrees head down between subjects, with overall mean -1.65 and s.d. 0.80. There was a statistically significant difference between responses of some subjects. Data from four subjects tested on both days was compared. A statistically significant correlation was not found, perhaps due to the small subject retest population. The differences between Mittelstaedt's data and present results are discussed.
by Elizabeth A. Dewell.
S.B.
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O'Heron, Patrick James 1966 y Patrick James 1966 O'Heron. "A multibody model simulating tilt-wing conversion". Thesis, The University of Arizona, 1991. http://hdl.handle.net/10150/291353.
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A multibody model is presented which simulates the conversion process associated with tilt-wing aircraft. A multibody dynamics approach is used to derive the equations of motion for a tilting articulated rotor with flap-pitch-lag root geometry. An enhanced model is used for the near-wake aerodynamics and uniform dynamic-inflow is used for the far-wake aerodynamics. A thrust control system computes the required trim settings. It is found that the controller can "fly" the model to a hover condition at a desired altitude, and can be used to achieve desired thrust levels during conversion. It is noted that conventional blade twist is inadequate during conversion. It is observed that unsteady aerodynamics are important during conversion. Also nonlinear effects on the tilt-wing cause large variations in tilt-torque during conversion.
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Ryynänen, L. (Lassi). "Nuorille tilaa ja toimintaa:Oululaisen nuorisotyön kehitys vuosina 1947–1997". Master's thesis, University of Oulu, 2016. http://urn.fi/URN:NBN:fi:oulu-201606022139.
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Tämä pro gradu -tutkielma tutkii oululaisen nuorisotyön kehitystä Oulun nuorisolautakunnan arkistomateriaalin kautta. Tutkimus on rajattu vuosiin 1947–1997. Tutkimus on rakenteeltaan temaattinen eli jokainen pääluku koostuu alaluvuista, joiden aihealueet ovat nuorisolautakunnan tekemä nuorisotyö, nuorisotilat ja nuorisoavustusten jakaminen nuorisojärjestöille.
Tutkimuksen kohde on nuorisolautakunnan järjestämä nuorisotyö Oulun kaupungissa. Päälähteenäni olen käyttänyt Oulun kaupungin arkistolta (OKA) löytyvää nuorisolautakunnan arkistomateriaalia. Materiaali on järjestetty ja se sisältää kaiken nuorisolautakunnan tuottaman arkistomateriaalin, kuten kokouspöytäkirjat ja toimintakertomukset. Tämän lisäksi olen käyttänyt kaupungin arkistolta löytyviä Oulun kaupungin tilinpäätöksiä sekä nuorisotyötä koskevaa tutkimuskirjallisuutta.
Tutkimukseni tarkoituksena on tuottaa tietoa siitä, miten nuorisotyö järjestettiin Oulussa. Tätä näkökulmaa tuetaan erilaisin kuvaajin. Olen kerännyt ja taulukoinut Oulun kaupungin tilinpäätöksistä ja nuorisolautakunnan toimintakertomuksista systemaattisesti numerotietoa nuorisolautakunnan palkkamenoista, hallitsemien nuorisotilojen neliömäärästä ja huoneistokuluista. Tämän lisäksi olen taulukoinut nuorisolautakunnan jakamia nuorisoavustuksia. Olen koonnut systemaattisesti kaikki nuorisolautakunnan jakamat avustukset vuosina 1947–1994 ja järjestänyt ne omaksi kuvaajakseen. Olen luokitellut nuorisojärjestöt vasemmistolaisiin, oikeistolaisiin, varhaisnuorisojärjestöihin, uskonnollisiin ja sitoutumattomiin. Lähdemateriaalin perusteella analysoin systemaattisesti taulukoimaani materiaalia ja tutkin laadullisesti sitä, miten nuorisojärjestöjen saamat avustukset muuttuivat tutkimuksen ajanjakson aikana ja mitä se kertoo nuorisotyöstä.
Tutkimukseni keskeiset tulokset ovat nuorisotyön ammattimaistuminen sekä nuorisotyön yhteiskunnallisen vaikuttavuuden kasvu tultaessa 1970-luvulle. Nuorisotilojen luku- ja neliömäärän kasvu ajoittui 1970-luvun loppuun ja 1980-luvun alkuun ja tähän samaan aikaan ajoittuu myös nuorten omaehtoisen toiminnan kasvu. Poliittisten nuorisojärjestöjen avustusten väheneminen 1990-luvun alussa on keskeinen tutkimukseni tulos. Varhaisnuorisojärjestöt ja harrastejärjestöt kasvattivat avustuksiaan poliittisten nuorisojärjestöjen kustannuksella. Nuoriso työtä kohdennettiin yhä enemmän nuorisotaloilla tapahtuvaan toimintaan 1970-luvulta alkaen. 1990-luvulla mukaan nuorisotoimi järjestää yhä enemmän tapahtumia yhteistyössä eri alojen toimijoiden kanssa. Musiikki- ja harrastustoiminta kasvattavat suosiotaan nuorten parissa. Erityisesti erilaisten musiikkitapahtumien ja discojen järjestäminen yleistyy 1970-luvulla, nämä ovat toimintaa, jossa nuoret saavat järjestää itse itselleen toimintaa.
Tutkimukseni keskeinen tulos on, että Oulun kaupungin nuorisotyö kehittyi kohti nuorisotaloilla tapahtuvaa toimintaa. Kun 1950-luvulla nuorisolautakunnan tehtävä oli avustaa nuorisojärjestöjä, oli tilanne muuttunut 1980- ja 1990-luvuille tultaessa. Tällöin nuorisolautakunta tuki nuoritoimea, jonka tehtävänä oli järjestää nuorille mielekästä tekemistä tapahtumien ja nuorisotaloilla tapahtuvan toiminnan kautta.
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Rosqvist, E. (Eerika). "Potilaiden kokemukset henkilökohtaisesta tilastaan ja sen säilymisestä sisätautien vuodeosastoilla". Doctoral thesis, Oulun yliopisto, 2003. http://urn.fi/urn:isbn:9514269608.
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Abstract The aim of the study was to describe Finnish patients' experiences of the regulation of personal privacy in hospital with the concept 'personal space'. The central topics of interest included the personal space and it's preservation. The right of self-determination while inpatients in hospital enables the patient to preserve personal space. Patients' experiences of personal space and it's preservation were examined by describing the significance of the preservation of personal space, other factors connected with personal space preservation, patients' means to protect their personal space preservation in the interaction with nursing staff, and the tactile, auditory, visual, and olfactory failure of personal space preservation. Patients' personal space was observed from the point of view of triangulation, and quantitative and qualitative data were integrated in the research. The purpose was to provide fresh knowledge in Finnish nursing science on patients' personal space and it's preservation in hospital, as well as to introduce the factors and concepts connected with the phenomenon of personal space to a wider public. The research material was collected in the internal medicine wards of a university hospital. The collection of data was carried out by means of a structured interview (N = 250) and the observation (N = 25) of interactive situations between patients and nursing staff. The structured questions of the interviews were analysed in the software SPSS for Windows 10.1.2. The results were presented as frequency and percentage distributions. The averages used were the mean, the mode, and the median. Cross-tabulation and Spearman's correlation coefficient were used to find out the correlation between variables. The significance of sum variables measuring auditory, visual, and olfactory invasion was tested by means of the t-test on independent groups, the one-way variance analysis, Mann-Whitney's U-test, and χ2-independence test. The open questions of the interviews and the observations were analysed with deductive-inductive content analysis. Patients' right of self-determination in relation to the nursing procedures on their own body was best implemented among the young and more educated patients. The patients protected their personal space with verbal messages related to pain and the right of self-determination, and with non-verbal messages related to body positions, gestures, expressions, eye contact as well as its avoidance, and to the use of hospital screens. The screens were used for the protection of one's own privacy and intimacy, but also for the protection of co-patients' privacy and intimacy. For the majority of the patients, the inviolability of their tactile and olfactory space were particularly important. The personal space had been invaded tactily, auditorily, and olfactorily. Significant factors affecting the experience of personal space were the patient's sex and age, the size of the patient room, the patient's coping capability in hospital, the number of treatments, and mood during hospitalisation. The failure of personal space preservation made the patients feel, above all, hurt and treated as objects. The patients found it justified for the nursing staff to touch them when assisting, but also thought that unnecessary extra taction does not belong to nursing practice. Taction by the nursing staff was mainly experienced as gentle and pain-reactive, as well as respectful of the patient's bodyTiivistelmä Tutkimuksen tarkoituksena oli kuvata suomalaisten potilaiden kokemuksia yksityisyyden säätelystä sairaalassa henkilökohtaisen tilan avulla. Mielenkiinnon kohteina olivat henkilökohtainen tila ja sen säilyminen. Potilaan itsemääräämisoikeuden toteutuminen hoidon aikana mahdollistaa henkilökohtaisen tilan säilymisen. Potilaiden kokemuksia henkilökohtaisesta tilastaan ja sen säilymisestä selvitettiin kuvaamalla henkilökohtaisen tilan säilymisen merkityksellisyyttä, henkilökohtaisen tilan säilymiseen yhteydessä olevia tekijöitä, potilaiden keinoja suojata henkilökohtaisen tilansa säilyminen ja henkilökohtaisen tilan säilymisen taktiilista, auditiivista, visuaalista ja olfaktorista epäonnistumista. Potilaan henkilökohtaista tilaa tarkasteltiin triangulaation näkökulmasta ja tutkimuksessa yhdistettiin kvantitatiivinen ja kvalitatiivinen aineisto. Tutkimuksen tavoitteena oli saada uutta suomalaista hoitotieteellistä tietoa potilaan henkilökohtaisesta tilasta ja sen säilymisestä sairaalassa sekä tehdä tunnetuksi henkilökohtaisen tilan ilmiöön liittyviä tekijöitä ja käsitteitä. Tutkimuksen aineisto kerättiin yliopistollisen sairaalan sisätautien klinikan vuodeosastoilla. Aineisto kerättiin strukturoidulla haastattelulla (N = 250) ja havainnoimalla (N = 25) potilaan ja hoitotyöntekijän välisiä vuorovaikutustilanteita. Haastattelujen strukturoidut kysymykset analysoitiin SPSS for Windows 10.1.2 -ohjelmalla. Tulokset esitettiin frekvenssi- ja prosenttijakaumina. Keskilukuina käytettiin keskiarvoa, moodia ja mediaania. Muuttujien välisten riippuvuuksien selvittämiseksi käytettiin ristiintaulukointia ja Spearmanin korrelaatiokerrointa. Auditiivista, visuaalista ja olfaktorista loukkaamista mittaavien summamuuttujien merkitsevyyden testaamiseksi käytettiin riippumattomien ryhmien t-testiä, yksisuuntaista varianssianalyysiä, Mann-Whitneyn U-testiä ja χ2-riippumattomuustestiä. Haastattelujen avoimet kysymykset ja havainnoinnit analysoitiin deduktiivis-induktiivisella sisällön analyysillä. Potilaiden itsemääräämisoikeus suhteessa omaa kehoa koskeviin hoitotoimenpiteisiin toteutui parhaiten nuorten ja enemmän koulutettujen potilaiden kohdalla. Potilaat käyttivät henkilökohtaisen tilansa suojaamiseksi erilaisia kipuun ja itsemääräämisoikeuteen liittyviä verbaalisia viestejä ja kehon asentoihin, eleisiin, ilmeisiin, katsekontaktiin ja sen välttämiseen sekä väliverhojen käyttämiseen liittyviä nonverbaalisia viestejä. Väliverhoja käytettiin suojaamaan omaa yksityisyyttä ja mahdollistamaan oma intimiteettisuoja, mutta myös suojaamaan potilastoverin yksityisyyttä ja mahdollistamaan hänelle intimiteettisuoja. Potilaat kokivat merkityksellisenä erityisesti taktiilisen ja olfaktorisen tilan säilymisen loukkaamattomana. Henkilökohtainen tila oli tullut loukatuksi taktiilisesti, auditiivisesti ja olfaktorisesti. Henkilökohtaisen tilan kokemiseen merkityksellisenä olivat yhteydessä potilaan sukupuoli, ikä, potilashuoneen koko, selviytymiskyky sairaalassa, hoitokertojen määrä ja mieliala sairaalassa. Henkilökohtaisen tilan säilymisen epäonnistuminen aiheutti potilaille etenkin pahaa mieltä ja itsen kokemista esineeksi. Potilaat oikeuttivat hoitotyöntekijän kosketuksen autettaessa, mutta turha ja ylimääräinen kosketus ei kuulu hoitotyöhön. Hoitotyöntekijän kosketus koettiin pääasiallisesti hellävaraiseksi, kivut huomioon ottavaksi ja kehoa kunnioittavaksi ja arvostavaksi
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Zolotas, Argyrios C. "Advanced control strategies for tilting trains". Thesis, Loughborough University, 2002. https://dspace.lboro.ac.uk/2134/4279.
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The use of tilting bodies on railway vehicles is becoming increasingly widespread: a number of well-established services using tilt technology already exist around the world, and will appear again in the UK over the next year or so. The motivation for tilting railway vehicles is that they give a cost-effective means of achieving a substantial reduction in journey time by increasing the vehicle speed during curves. Early tilt controller designs were based upon local vehicle measurements, however at that time this approach did not prove very successful. Nowadays most European manufacturers use the so called ‘precedence' control scheme, utilising measurements from precedent vehicles to achieve ‘precedence' information. However, achieving a satisfactory local tilt control strategy is still an important research target because of the system simplifications and more straightforward failure detection. The thesis describes a comprehensive study of tilt control, and its aim is to employ advanced control techniques - based upon practical sensors - with the particular objective of identifying effective strategies which can be applied to each vehicle independently, i.e. without using precedence control. The sensors employed for control design are in particular mounted on the vehicle passenger coach. Most of the work has been undertaken using Matlab, and this has included a proper assessment of the ride quality issues.
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Bratu, Vlad-Ioan. "Self-optimization of Antenna Tilt in Mobile Networks". Thesis, KTH, Kommunikationssystem, CoS, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-101981.
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The increased complexity of mobile networks, the need to deliver high data rate services and the variation of mobile traffic put a high burden on operation and maintenance in terms of extra workload and additional costs . New approaches to network optimization and management should be taken into account to increase network performance and reduce operational costs. Antenna tilt is a powerful parameter for optimization of a mobile network. It has direct impact on shaping the boundary of the serving cell and hence on the coverage and interference parameters of the network. With the introduction of Remote Electrical Tilt (RET) antennas, tilt optimization can be used in the context of self-optimization. This work discusses how base station antenna tilt can be used as a self-optimization tool for load-balancing and presents a framework for a self-optimization process that can be integrated into existing and future mobile networks. Tests using real traffic data proved that the self-optimization process can be used to correctly identify congested cells. Both link level and system level simulations are performed to determine the impact of tilt adjustments on network performance. The results show that antenna tilt can be an effective tool to achieve load-balance between neighbouring cells and thus increase the Grade of Service (GoS). Furthermore, different tilt adjustment procedures are discussed each with it's advantages and disadvantages. It is concluded that antenna tilt can be successfully used for self-optimization purposes and possible limitations and issues are discussed.Performance Evaluation of Antenna based SON
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Zhao, Li. "Micro-electro-mechanical Tilt Sensor Design and Fabrications". Thesis, Imperial College London, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.506035.
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Lim, Linus C. S. "Stability of Precast Concrete Tilt Panels in Fire". University of Canterbury. Civil Engineering, 2000. http://hdl.handle.net/10092/8280.
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This report investigates the behaviour of slender cantilever concrete panels and concrete panels in steel frames exposed to elevated temperatures. This report also provides recommendations for the design of slender tilt-up wall panels for fire resistance.
The current trend of tilt-up construction in industrial buildings utilises very tall and thin concrete wall panels that are reinforced with a single layer of reinforcing in the middle. These wall panels are cantilevered from the base and are not connected to a column or a portal frame. The panels are connected directly to the steel frame by a steel rafter or indirectly to the eaves tie.
The analysis of this project was conducted using SAFIR, a non-linear finite element programme developed in the University of Liege, Belgium. Reinforced concrete walls subjected to a fire on one side will undergo non-uniform thermal expansion, causing the walls to bow. Free-standing concrete cantilever walls with slenderness ratios (Height to thickness ratio) in excess of 50 experience very large deflections when exposed to a fire on one side. The analyses have shown that these large deflections will lead to outward collapse of the walls onto the neighbouring property.
Concrete cantilever walls connected to unbraced steel frames are dangerous as they cause the frame to sway and fall out onto the neighbouring property during a fire. Braced steel frames connected to the walls enhance the behaviour of the walls by preventing the large outward deflections of the panels. If bracing is available from the steel roof to prevent sway, the wall panels can be constructed up to 12 metres and slenderness ratios up to 96, without outward collapse or buckling failure of the wall panels. For the partially braced frames conducted in this study, the height of the wall panels should not exceed 9.0 metres and the slenderness ratios should not exceed 65.
It is concluded that the deflections of the free standing cantilever walls should be controlled. Slender cantilever walls should be connected to a braced steel frame with well designed connections to the rafter and the eaves tie.
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Mat, Isa Ahmed Radzi. "Discrimination between tilt and acceleration in horizontal seismometers". Thesis, University of Reading, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.279599.
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Grima, Alexander. "Aerodynamic characterisation of an experimental tilt-wing aircraft". Thesis, KTH, Flygdynamik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-198526.
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Computational analysis of experimental aircraft prior to test ights can be a valuable tool to estimate ight characteristics and determine areas of elevated caution. It can also provide feedback to software and model developers as to the accuracy of models used when the aircraft is ultimately own. This paper describes the aerodynamic analysis and characterisation of an experimental tilt-wing aircraft with a unique design. The paper covers what analysis is performed as well as results of these aircraft characterisations. Through this analysis a database le is created for use with NASA Design and Analysis of Rotorcraft (NDARC) tool.
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Iakovidis, Grigorios. "Safe Reinforcement Learning for Remote Electrical Tilt Optimization". Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-294161.
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The adjustment of the vertical tilt angle of Base Station (BS) antennas, also known as Remote Electrical Tilt (RET) optimization, is a simple and efficient method of optimizing modern telecommunications networks. Reinforcement Learning (RL) is a machine learning framework that can solve complex problems like RET optimization due to its capability to learn from experience and adapt to dynamic environments. However, conventional RL methods involve trial-and-error processes which can result in short periods of poor network performance which is unacceptable to mobile network operators. This unreliability has prevented RL solutions from being deployed in real-world mobile networks. In this thesis, we formulate the RET optimization problem as a Safe Reinforcement Learning (SRL) problem and attempt to train an RL policy that can offer performance improvement guarantees with respect to an existing baseline policy. We utilize a recent SRL method called Safe Policy Improvement through Baseline Bootstrapping (SPIBB) to improve over a baseline by training an RL agent on a offline dataset of environment interactions gathered by the baseline. We evaluate our solution using a simulated environment and show that it is effective at improving a tilt update policy in a safe manner, thus providing a more reliable RL solution to the RET optimization problem and potentially enabling future real-world deployment.Justeringen av den vertikala lutningsvinkeln hos basstationens antenner, även kallad Remote Electrical Tilt (RET) optimering, är en enkel och effektiv metod för att optimera moderna telenät. Förstärkningsinlärning är en maskininlärningsram som kan lösa komplexa problem som RET-optimering tack vare dess förmåga att lära sig av erfarenhet och anpassa sig till dynamiska miljöer. Konventionella förstärkningsinlärning metoder innebär emellertid försök och felprocesser som kan leda till korta perioder av dålig nätverksprestanda, vilket är oacceptabelt förmobilnätoperatörerna. Denna otillförlitlighet har hindrat förstärkningsinlärning lösningar från att användas i verkliga mobila nätverk. I denna hypotes formulerar vi problemet med RET-optimering som ett problem med Säker Förstärkningsinlärning(SF) och försöker utbilda en förstärkningsinlärning policy som kan erbjuda garantier för förbättrad prestanda i förhållande till en befintlig grundläggandepolicy. Vi använder en nyligen genomförd SF-metod som kallas Safe PolicyImprovement by Baseline Bootstrapping (SPIBB) för att förbättra en baslinje genom att utbilda en förstärkningsinlärning agent på en offlinedatabaserad datamängdmed miljöinteraktioner som samlats in vid baslinjen. Vi utvärderar vår lösning med hjälp av en simulerad miljö och visar att den är effektiv när det gäller att förbättra politiken för tippuppdatering på ett säkert sätt, vilket ger en mer tillförlitligförstärkningsinlärning lösning på problemet med RET-optimering och eventuellt möjliggör framtida realglobal driftsättning.
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Destombes, Bérangère. "Le tilt test positif : résultats et aspects électrocardiographiques". Bordeaux 2, 1996. http://www.theses.fr/1996BOR23036.
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Peruzzi, Anna. "Tilt-evoked responses in persons with idiopathic Parkinson's disease". Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=60452.
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The objective of the present thesis was to conduct a comparative study between persons with idiopathic Parkinson's disease and similarly aged normal subjects, by examining their lower limb reflex responses to forward whole head-body tilts under different sensory conditions.Tilts were applied with subjects (10 parkinsonian and 10 control) in standing, via a tilting apparatus through an axis collinear with the ankle joints. Vestibular input was manipulated by changing the acceleration of the tilt, visual input by the use or removal of a blindfold, and somatosensory input by the use of a compliant versus a firm support surface.
We found a consistently lower number of respondents in parkinsonian subjects under all the tilting conditions. These patients also demonstrated a higher proportion of absent or abnormal tilt-evoked responses, while exhibiting a significantly greater resting EMG activity in proximal limb muscles.
The most significant difference lies in the number of respondents between the two subject groups during the "eyes closed-compliant surface" tilting condition. The basal ganglia play a particular role in the weighing of appropriate versus inappropriate sensory inputs, in order to modify balance responses according to changes in environmental conditions.
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Kilfoil, Peter J. "CALF HEMODYNAMICS DURING VENOUS OCCLUSION AND HEAD-UP TILT". UKnowledge, 2007. http://uknowledge.uky.edu/gradschool_theses/446.
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The potential role of lower limb blood pooling in reducing venous return to the heart during orthostasis and elevated venous pressure is investigated. This study compares lower limb capacitance, microvascular filtration, and peripheral resistance between a group of highly trained endurance athletes and a group of their sedentary peers. Seven endurance trained males were selected between the ages of 23-33 [(29.1 4.1 yr), mean SD]. The subjects weekly cycling mileage ranged from 80 to 150 miles per week with an average of 125 8.5 miles/week. Nine healthy, age-matched sedentary subjects (25.8 4.8 yr.) were selected for the control group, based upon their reporting they had not participated in repeated lower-body or cardiovascular exercise in the months prior to their study. Results show that both subject groups had similar calf venous capacitances, rates of capillary fluid filtration, and local flow shunting (vascular resistance change) in response to venous thigh occlusion and 70 head-up tilt (HUT). The only significant difference found between groups was the cyclist groups smaller rise in heart rate in response to HUT. The findings of this study suggest that cyclists are not predisposed to orthostatic intolerance due to any changes in lower limb function.
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McVicar, J. Scott G. "A generic tilt-rotor simulation model with parallel implementation". Thesis, University of Glasgow, 1993. http://theses.gla.ac.uk/4952/.
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The unique capabilities of the tilt-rotor configuration are generally accepted to provide significant potential when applied to numerous civil and military operations. A vital stage in the development of any tilt-rotor design is the simulation of its basic flying qualities which are essentially defined by the vehicle's response to a range of control inputs and the trim states it adopts. In order to carry out this simulation satisfactorily, an accurate generic mathematical model is required, however, the author is unaware of any existing tilt-rotor simulations which utilise the latest modelling techniques. A generic tilt-rotor simulation model (GTILT) which includes individual blade modelling to describe the behaviour of the rotor has been developed during this research. One of the most significant attributes of individual blade models is that they portray the oscillatory nature of the forces and moments produced by a lifting rotor. The resulting trimmed flight path of the vehicle is periodic rather than steady in nature and consequently existing trimming algorithms, formulated for use with rotor disc representations, are inappropriate when applied to individual blade simulations. A specialised trimming algorithm capable of rapidly trimming rotorcraft simulations to a specified periodic trim state has been developed and incorporated into the GTILT model. Individual blade modelling provides a higher level of fidelity than is possible when using a rotor disc representation but this benefit is obtained at the expense of computational burden. Hence, most sequential computing facilities are unable to provide the performance necessary to make such models practical. In order to reduce computational run-times to an acceptable level GTILT has been parallelised and implemented on a custom designed transputer network. GTILT has been configured using XV-IS data in order to investigate the fidelity of its predicted trim states and vehicle response to a range of control inputs. During the course of this investigation, the trim algorithm is shown to be robust and capable of producing rapid convergence to a wide range of trim states. Longitudinal trims predicted by GTILT are verified against those of the similarly configured Bell C81 for a range of nacelle incidences and good correlation obtained in all cases. A qualitative verification of the trim states adopted in turning flight reveals no anomalies and the results obtained are very encouraging. The dynamic response of the vehicle is demonstrated to be qualitatively valid when a range of control inputs are applied at various nacelle incidences with the behaviour of the vehicle being explicable in all cases.
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Hasan, Muhammed Kamrul. "The vulnerability of the Dupi Tila Aquifer, Dhaka, Bangladesh". Thesis, University College London (University of London), 1999. http://discovery.ucl.ac.uk/1317910/.
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The Dupi Tila aquifer in Bangladesh is of national importance, providing over 95% of the water supply for the capital city, Dhaka. The demand for water is rising inexorably. There is concern about the sustainability of the aquifer and its vulnerability to contamination. In Dhaka, the Dupi Tila aquifer is confined by the Madhupur Clay. Natural recharge to the aquifer is by vertical leakage through the Madhupur Clay. However, large-scale development of the aquifer since 1971 has continued beyond the rate which could be sustained by vertical leakage. Piezometric levels have steadily declined, aquifer storage has been depleted, the aquifer has become unconfined over large parts of the city, and an extensive cone of depression has developed outwards to the rivers bounding the city. The extent to which groundwater abstraction can be balanced by induced river recharge and enhanced vertical leakage has been explored by development of a groundwater flow model. Both types of recharge are potential sources of contamination. To assess aquifer vulnerability to contamination, a detailed survey of groundwater quality across Dhaka has been made and related to previous data. A plume of contaminated groundwater is shown to have intruded the aquifer. In addition, a preliminary survey of organic contamination suggests that contaminants from industrial areas are entering the aquifer through the Madhupur Clay. To evaluate the relative impact on groundwater quality of induced river recharge and enhanced vertical leakage, a solute transport model was developed from the groundwater flow model. Induced recharge from the contaminated River Buriganga is responsible for the plume of low quality groundwater in the South West of the city. Vertical leakage of contaminated urban recharge may affect groundwater quality more widely in the longer term. Recommendations are made for the protection of the Dupi Tila aquifer as a source of high quality groundwater.
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CASTRO, ALESSANDRA TAVARES DE. "TILT TESTS AND DIRECT SHEAR ON SOIL-GEOSYNTHETIC INTERFACES". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2008. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=12570@1.
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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIROCOORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
A aplicação de geossintéticos em obras geotécnicas vem crescendo intensamente nos últimos tempos, tornando cada vez mais importantes e necessários os estudos da resistência de interface para aplicação em projetos e obras. Em particular, tais estudos devem tratar das técnicas de ensaios de campo e de laboratório para a obtenção dos parâmetros de resistência (adesão e ângulo de atrito). Os ensaios de laboratório são utilizados com maior freqüência por serem mais acessíveis e de fácil execução. Os ensaios de campo reproduzem mais diretamente as condições das obras, mas apresentam como desvantagem o custo elevado e a dificuldade de execução. Este trabalho tem como finalidades apresentar o equipamento de ensaio utilizado e analisar os resultados de um programa em interfaces solo- geossintético. O programa experimental envolveu ensaios de rampa, cisalhamento direto convencional e cisalhamento direto inclinado em solo com granulação grosseira (brita), em contacto com as geomembranas e as geogrelhas. Os resultados foram analisados avaliando-se as influências da tensão confinante e da inserção dos geossintéticos, e comparandose os diferentes tipos de materiais e de técnicas de ensaio. A influência da tensão confinante foi estudada com base em três tensões confinantes distintas, de baixa magnitude (1,0; 1,7 e 2,4kPa). O aumento da tensão confinante implicou em um aumento, tanto do deslocamento até a ruptura quanto da resistência da interface. Este comportamento deve-se à possibilidade de rearranjo e imbricamento entre os grãos da brita. Em relação ao tipo de geossintético, a interface brita-geogrelha apresentou maior resistência do que a interface brita-geomembrana. Isto pode ser explicado em função da estrutura do geossintético, pois a geomembrana perde possui uma superfície lisa, o que favorece o deslizamento, ao contrário da geogrelha, que conta com o efeito do imbricamento do solo nas aberturas da malha.
The use of geosynthetics in geotechnical construction is growing up intensively on the last years, which make the study on interface strength more important and necessary to its application on projects and construction. Particularly, these studies should watch out field and laboratory tests in order to obtain strength parameters (adhesion and friction angle). Laboratory tests are more frequently used, due to their accessibility and easy execution. Field tests reproduce construction condition in a directly way, but have as disadvantages high cost and hard execution condition. The current research have as objectives present the test equipment used and analyze software results obtained for soil and geosynthetic interfaces. The experimental program involved ramp tests, conventional direct shear test and inclined direct shear test. This program was carried out on gravel soil in contact with two different types of geosynthetics (geomembrane and geogrids). Results were analyzed based on the influence of confining pressure and the introduction of geosynthetics, and comparing the different materials and test techniques. The confining pressure influence/importance was studied based on three different low magnitude confining pressures (1,0; 1,7 e 2,4kPa). The confining pressure increases resulted in an increase of both displacements until the failure and interface strength. This behavior could be explained due to the possibility of interlocking e between the gravel grains. Considering the geosynthetic type, gravel-geogrid interface presented higher strength than gravel- geomembrane interface. This could be explained by the structure of the geosynthetic; geomembrane has low strength due to its smooth surface, which benefits the slide. Geogrid instead, counts with the soil interlocking; effects in the mesh holes.
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Rea, Alexander David. "Fast tip-tilt correction at the MROI and beyond". Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708940.
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Ting, Nai-Hsin 1964. "Earthquake-induced tilt of retaining wall with saturated backfill". Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/17319.
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Bhatt, Jayesh S. y Marc-Olivier Coppens. "Diffusion at tilt grain boundaries in polycrystalline porous materials". Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-198033.
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Sinclair, Mark Macdonald. "Object tracking with a pan, tilt and zoom camera". Thesis, University of Edinburgh, 2005. http://hdl.handle.net/1842/14426.
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This thesis reviews the existing work done on tracking with pan/tilt/zoom cameras and proposes a novel method of multiscale block tracking with perspective cameras using principles and methods from both computer vision and computer graphics. The theory of perspective transforms in 3D graphics is reviewed as well as relating real world cameras to synthetic cameras through camera calibration. Conventional 2D block tracking methods are reviewed and the expanded to track under pan, tilt and zoom conditions. Two methods of pan/tilt/zoom tracking are developed and then applied to blocks and blobs (connected regions of pixels). A novel offline technique of fitting contours to these track points is then explored with and without the presence of pan, tilt and zoom. A method of updating the multiscale reference block is presented and the tracker is evaluated without block updating (feed forward) and with block updating and position filtering. Experimental results for people following are presented using synthetic ray-traced data with absolute ground truth and real sequences taken with a commercial pan/tilt/zoom camera with hand estimated ground truth. All sequences were processed offline, however, with optimisation it appears to be feasible to implement a real-time solution. Applying position filtering and predictions, using a Kalman filter, improves results and robustness. The application of this method to existing vision techniques is discussed as well as the possible methods for real-time implementation of these algorithms.
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Bhatt, Jayesh S. y Marc-Olivier Coppens. "Diffusion at tilt grain boundaries in polycrystalline porous materials". Diffusion fundamentals 24 (2015) 6, S. 1, 2015. https://ul.qucosa.de/id/qucosa%3A14520.
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Lim, Chim Chai. "Analysis, design, and construction of tilt-up wall panel". Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/45801.
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The idea of tilt-up construction started in America in the early I900’s. In the beginning, this technique was mainly used on structures such as industrial warehouses and factories. However, recent developments and improvements in tilt-up construction technique and accessories have enabled this building method to be applied to many architecturally appealing offices and residential structures.
There are many details the design-build team must consider to ensure the success of a tilt-up project. The floor slab must be designed for panel casting and to withstand the loading of the mobile crane which will be used to lift the panel. The crane capacity affects the panel size and weight. Proper curing and bondbreaker application are very important to reduce bonding and to ensure clear cleavage between concrete surfaces. Changing rigging configuration consumes expensive crane time and must be reduced to minimum possible. The availability of ground-release quick connect/disconnect tilt—up hardware improves workers safety and speeds up the erection process substantially.
Although the stress analysis of simple wall panels during erection can be done by hand, panels with more complicated geometry or with openings, are more efficiently analysed with a computer. Many manufacturers have technical services to help in the design of insert layout so that the concrete will not be over stressed when the panel is tilted into position. After the panel is plumbed, it is braced temporarily before the final connection is made. For in-place loading there are now design aids available which ease the design process. When properly designed and built, tilt—up has proved to be a fast, efficient, and economical building construction technique.Master of Science
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Jönsson, Jack. "Belief-aided Robust Control for Remote Electrical Tilt Optimization". Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-301028.
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Remote Electrical Tilt (RET) is a method for configuring antenna downtilt in base stations to optimize mobile network performance. Reinforcement Learning (RL) is an approach to automating the process by letting an agent learn an optimal control strategy and adapt to the dynamic environment. Applying RL in real world comes with challenges, for the RET problem there are performance requirements and partial observability of the system through exogenous factors inducing noise in observations. This thesis proposes a solution method through modeling the problem by a Partially Observable Markov Decision Process (POMDP). The set of hidden states are modeled as a high- level representation of situations requiring one of the possible actions uptilt, downtilt, no change. From this model, a Bayesian Neural Network (BNN) is trained to predict an observation model, relating observed Key Performance Indicators (KPIs) to the hidden states. The observation model is used for estimating belief state probabilities of each hidden state, from which decision of control action is made through a restrictive threshold policy. Experiments comparing the method to a baseline Deep Q- network (DQN) agent shows the method able to reach the same average performance increase as the baseline while outperforming the baseline in two metrics important for robust and safe control behaviour, the worst- case minimum reward increase and the average reward increase per number of tilt actions.Fjärrstyrning av Elektrisk Lutning (FEL) är en metod för att reglera lutningen av antenner i basstationer för att optimera presentandan i ett mobilnätverk. Förstärkande Inlärning (FI) används som metod för att automatisera processen genom att låta en agent lära sig en optimal strategi för reglering och anpassa sig till den dynamiska miljön. Att tillämpa FI i ett verkligt scenario innebär utmaningar, för FEL specifikt finns det krav på en viss nivå av prestanda samt endast en delvis observerbarhet av systemet på grund av externa faktorer som orsakar brus i observationerna. I detta arbete föreslås en metod för att hantera detta genom att modellera problemet som en Delvis Observerbar Markovprocess (DOM). De dolda tillstånden modelleras för att representera situationer där var och en av de möjliga aktionerna behövs, det vill säga att luta antennen upp, ner eller inte ändra på lutningen. Utifrån denna modellering så tränas ett Bayesiskt Neuralt Nätverk (BNN) för att estimera en observationsmodel som kopplar observerade nyckeltal till de dolda tillstånden. Denna observationsmodel används för att estimera sannolikheten att vardera dolt tillstånd är det rätta. Utifrån dessa sannolikheter så görs valet av aktion genom ett tröskelvärde på sannolikheterna. Genom experiment som jämför metoden med en standardimplementering av en agent baserad på ett Djupt Qnätverk (DQN) visas att metoden har samma prestation när det kommer till en medelnivå på prestandaökning i nätverket. Metoden överträffar dock standardmetoden i två andra mätvärden som är viktiga ur aspekten säker och robust reglering, minimumvärdet på prestandaökningen samt medelökningen av prestandan per antal up- och nerlutningar som används.
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Parwaga, Sandeep. "An investigation of the gaze contingent tilt after-effect". Thesis, University of Leicester, 2015. http://hdl.handle.net/2381/37434.
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In order to act on the world around us, the brain needs to encode the location of visible objects. This begins with representing the location of visual features on the retina. However, a retinal representation alone does not provide information about the direction of visual features with respect to the head or body whenever the eyes, head and body move. Therefore, successful action requires more than a retinal representation of location. One possibility is that the locations of visible objects may be encoded in retino-centric, head-centric and body-centric frames of reference. To investigate this, we used a well-known visual phenomenon: the tilt aftereffect (TAE). We investigated whether visual feature tilt is represented beyond a retino-centric representation, using a gaze contingent adaptation paradigm. The results of seven experiments yielded four key findings: 1) The TAE was contingent on gaze, suggesting that the TAE is not just retino-centric. We found evidence of a head-centric representation of tilt, but no evidence of a body-centric or world-centric representation of tilt. 2) The gaze contingent TAE showed different characteristics compared to the conventional TAE. While the conventional TAE was sensitive to test stimulus duration, the gaze contingent TAE was not. The gaze contingent TAE was also significantly smaller in aftereffect magnitude. Both TAEs shared similar characteristics with respect to stimulus contrast. 3) We found no evidence that either TAE was modulated by attention. 4) Our findings support the conclusion that the conventional TAE is the result of adaptation of two mechanisms: a tilt sensitive mechanism and a gaze direction encoding mechanism. This result fits with neurophysiological findings of neurons jointly sensitive to tilt and gaze direction (Trotter & Celebrini, 1999). Concluding, our results in this thesis provide psychophysical evidence that our impression of the world is based on head-centric visual representations.