To see the other types of publications on this topic, follow the link: Threshold Detector.
Dissertations / Theses on the topic 'Threshold Detector'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'Threshold Detector.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
Lechesa, Wahau Simon. "A variable threshold for an energy detector using GNU radio." Master's thesis, University of Cape Town, 2018. http://hdl.handle.net/11427/29862.
Full textAbstract:
Spectrum is a natural resource and should be treated as such. Spectrum has dual use applications that range from short distance communication links such as Bluetooth to health, power systems, transport, smart city applications and space communications and exploration. Next Generation Networks (NGNs) are designed to connect millions of devices seamlessly and with high throughput rates in the aforementioned sectors and others not mentioned. The use of spectrum has to be efficiently utilized and appropriated. Cognitive radio communications serve to improve use of dwindling spectrum availability. Spectrum sensing is the first and critical technology in cognitive radio meant to determine radio parameters. Energy Detection (ED) is a spectrum sensing technology that has a low computational and operational complexity, a relatively fast spectrum sensing technique to other spectrum sensing technologies, and requires no knowledge of the primary user’s transmit signal properties such as modulation or error correction schemes. In its classical case, ED compares the signal energy received with a fixed detection threshold, estimated with an expected noise level. Noise however in practice varies randomly due to thermal variations, non-uniform movement of electrons, imperfections of semiconductor materials and external noise sources to mention a few. This creates a noise uncertainty phenomenon which negatively affects the fixed threshold approach used in classical ED. Development of an out-of-tree module for a variable threshold energy detector using the estimated noise power at each sample point is presented in this dissertation. GNU Radio software and Ettus Universal Software Radio Peripheral (USRP) hardware were used to simulate the performance of the proposed variable threshold energy detector. The Neyman-Pearson theory was adopted in achieving the proposed variable threshold energy detector. The variable threshold energy detector successfully sensed the presence of a primary user signal at 1.25% less the spectrum sensing time of the constant threshold. An ROC curve plot also showed that the proposed variable threshold energy detector had a better performance in general as opposed to the constant threshold energy detector at low signal-to-noise ratio levels.
2
Kusumoto, Tamon. "Radial electron fluence around ion tracks as a new physical concept for the detection threshold of PADC detector." Thesis, Strasbourg, 2017. http://www.theses.fr/2017STRAE046/document.
Full textAbstract:
La structure et le processus de formation des traces latentes dans le poly (allyl diglycol carbonate), PADC, ont été étudiés par spectroscopie FT-IR et par simulation Monte Carlo. La quantité de groupes OH formés est équivalente à la quantité de disparition des groupes éther. L’utilisation de radiations à faible TLE a prouvé que les fonctions carbonyle ne disparaissent que lorsque deux électrons au minimum interagissent avec une seule unité de répétition du polymère. Les résultats obtenus avec des protons de haute énergie permettent de comprendre la différence entre des traces révélables et non-révélables. Sur la base de ces résultats, un nouveau concept physique de Fluence Electronique Radiale autour de la Trace d’un Ion, défini comme la densité d'électrons secondaires qui traversent une surface cylindrique de rayon donné, est proposé pour décrire le seuil de détection du PADC en utilisant le code Geant4-DNA. Les connaissances acquises sont utiles pour trouver des agencements moléculaires appropriés pour de nouveaux détecteurs de sensibilités désirées<br>The structure and formation process of latent tracks in poly(allyl diglycol carbonate), PADC, have been examined using the combination of FT-IR spectrometry and a Monte Carlo simulation. The generation amount of OH groups is almost equivalent to the loss amount of ether. An important role of the secondary electron that the carbonyl can be broken only when more than two electrons pass through a single repeat unit is clarified by experiments using low LET radiations. Results of high energy protons lead us to the elucidation of the difference between etchable and un-etchable tracks. Based on these results, a new physical concept of Radial Electron Fluence around Ion Tracks, which is defined as the number density of secondary electron that pass through the cylinder surface with a certain radius is proposed for the detection threshold of PADC using Geant4-DNA. Obtained knowledge is helpful to find appropriate molecule arrangements for new etched track detector with desired sensitivities
3
Herbach, Clauß-Michael, H. G. Ortlepp, and Wolfgang Wagner. "Decay Study of Hot Nuclei below the Multifragmentation Threshold with the FOBOS Detector at Dubna." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-30960.
Full textAbstract:
The first series of experiments at the FOBOS detector, using beams of the U-400M cyclotron of the Flerov Laboratory of Nuclear Reactions, was devoted to few-fragment decays of equilibrated systems. To exclude deep inelastic collisions or quasifission as sources of massive fragments, hot heavy nuclei were produced in the very asymmetric reactions 7Li (43 AMeV) + 232Th, 14N (34 AMeV) + 197Au, and 14N (53 AMeV) + 197Au, 232Th. Two- and three-fragment events were analysed on the base of masses and velocity vectors measured independently for each fragment. The events were sorted into excitation energy bins according to the linear momentum transfer following the massive transfer approach. Binary events were treated as fission. Fragment mass distributions as well as total kinetic energies were studied for an excitation energy range of 100 - 500 MeV. A new TKE parametrisation is proposed extending the Viola systematics to large mass asymmetries. With rising excitation energy the mass dispersion develops unexpectedly. Two new effects have been fourid and are discussed as consquences of the cooling down during the slow fission process at moderate E*, and of a strong decrease of the fission time at large E*. Ternary events were analysed by comparing measured velocity correlations with results of Coulomb trajectory simulations. If one fragment has intermediate mass (A = 10...30), two components in the relative velocities and the Z/A ratios confirm a sequential and a neck mechanism. For events with three fragments of comperable size neither the assumption of two sequential independent fission acts nor a nlultifragnlentaion-like scenario can reproduce the data. Agreement is achieved if these three-fragment decays are characterized by a collinear intermediate state followed by two scissions separated by no more than 280 fm/c, a very short time scale compared with usual saddle-to-scission intervals.
4
Strekalovsky, O. V., K. D. Schilling, V. G. Tichtchenko, et al. "Decay Study of Hot Nuclei Below the Multifragmentation Threshold with the FOBOS Detector at Dubna." Forschungszentrum Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-31327.
Full text
5
Herbach, Clauß-Michael, H. G. Ortlepp, and Wolfgang Wagner. "Decay Study of Hot Nuclei below the Multifragmentation Threshold with the FOBOS Detector at Dubna." Forschungszentrum Rossendorf, 1997. https://hzdr.qucosa.de/id/qucosa%3A21923.
Full textAbstract:
The first series of experiments at the FOBOS detector, using beams of the U-400M cyclotron of the Flerov Laboratory of Nuclear Reactions, was devoted to few-fragment decays of equilibrated systems. To exclude deep inelastic collisions or quasifission as sources of massive fragments, hot heavy nuclei were produced in the very asymmetric reactions 7Li (43 AMeV) + 232Th, 14N (34 AMeV) + 197Au, and 14N (53 AMeV) + 197Au, 232Th. Two- and three-fragment events were analysed on the base of masses and velocity vectors measured independently for each fragment. The events were sorted into excitation energy bins according to the linear momentum transfer following the massive transfer approach. Binary events were treated as fission. Fragment mass distributions as well as total kinetic energies were studied for an excitation energy range of 100 - 500 MeV. A new TKE parametrisation is proposed extending the Viola systematics to large mass asymmetries. With rising excitation energy the mass dispersion develops unexpectedly. Two new effects have been fourid and are discussed as consquences of the cooling down during the slow fission process at moderate E*, and of a strong decrease of the fission time at large E*. Ternary events were analysed by comparing measured velocity correlations with results of Coulomb trajectory simulations. If one fragment has intermediate mass (A = 10...30), two components in the relative velocities and the Z/A ratios confirm a sequential and a neck mechanism. For events with three fragments of comperable size neither the assumption of two sequential independent fission acts nor a nlultifragnlentaion-like scenario can reproduce the data. Agreement is achieved if these three-fragment decays are characterized by a collinear intermediate state followed by two scissions separated by no more than 280 fm/c, a very short time scale compared with usual saddle-to-scission intervals.
6
Strekalovsky, O. V., K. D. Schilling, V. G. Tichtchenko, et al. "Decay Study of Hot Nuclei Below the Multifragmentation Threshold with the FOBOS Detector at Dubna." Forschungszentrum Rossendorf, 1996. https://hzdr.qucosa.de/id/qucosa%3A21959.
Full text
7
Wong, Winnie. "A Hybrid Pixel Detector ASIC with Energy Binning for Real-Time, Spectroscopic Dose Measurements." Doctoral thesis, Mittuniversitetet, Institutionen för informationsteknologi och medier, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-16171.
Full textAbstract:
Hybrid pixel detectors have been demonstrated to provide excellent quality detection of ionising photon radiation, particularly in X-ray imaging. Recently, there has been interest in developing a hybrid pixel detector specifically for photon dosimetry. This thesis is on the design, implementation, and preliminary characterisation of the Dosepix readout chip. Dosepix has 256 square pixels of 220 mm side-length, constituting 12.4 mm2 of photo-sensitive area per detector. The combination of multiple pixels provides many parallel processors with limited input flux, resulting in a radiation dose monitor which can continuously record data and provide a real-time report on personal dose equivalent. Energy measurements are obtained by measuring the time over threshold of each photon and a state machine in the pixel sorts the detected photon event into appropriate energy bins. Each pixel contains 16 digital thresholds with 16 registers to store the associated energy bins. Preliminary measurements of Dosepix chips bump bonded to silicon sensors show very promising results. The pixel has a frontend noise of 120 e-. In low power mode, each chip consumes 15 mW, permitting its use in a portable, battery-powered system. Direct time over threshold output from the hybrid pixel detector assembly reveal distinctive photo-peaks correctly identifying the nature of incident photons, and verification measurements indicate that the pixel binning state machines accurately categorise charge spectra. Personal dose equivalent reconstruction using this data has a flat response for a large range of photon energies and personal dose equivalent rates.
8
Kompany, Kianoush. "Performance Evaluation of Transit Signal Priority in Multi-Directional Signal Priority Request Situations." Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/78271.
Full textAbstract:
Ring Barrier signal controller in VISSIM traffic simulation software provides different options for configuring Transit Signal Priority. This controller emulator allows for considering arterial progression by Priority Progression parameter; preferring specific transit signal priority calls to other calls by Priority Level feature; providing more green split to the signal priority phase by Green Extension attribute. This study aims to evaluate the impact of these three parameters on the performance of transit signal priority. The study area is based on three signalized intersections of Prices Fork Road in Blacksburg, Virginia. A total of five transit lines are assumed to request signal priority. Green Extension and Priority Level were found to have significant influence on bus delays, whereas bus frequency is not a significant variable to affect TSP effectiveness (for reducing the transit delays).
This study also aims to identify the traffic conditions in which the adaptive feature of VISSIM Ring Barrier Controller can be most useful. Detector Slack, Detector Adjust Threshold, and Adjust Step are the parameters that should be hardcoded in the controller for activating the adaptiveness feature. The study area (Prices Fork Road in town of Blacksburg, VA) incorporates five bus lines are assumed eligible to request priority. This study revealed that transit service overlap can enhance or exacerbate each bus performance when transit signal priority is implemented, depending on the scheduled headways and the frequency of signal priority requests in each intersection.<br>Master of Science
9
GUARISE, MARCO. "An experimental study of novel schemes for low-energy-threshold and low-background particle detection in rare gas crystals." Doctoral thesis, Università degli studi di Ferrara, 2020. http://hdl.handle.net/11392/2488080.
Full textAbstract:
There are numerous indications about possible new physics beyond the Standard Model and in particular, one of the major issues refers to the Universe composition. Indeed, the ordinary matter, which is everything we know, seems to account for only a tiny fraction of the Cosmos' mass. The unknown part of the Universe mass is the so-called dark matter which represents one of the greatest mysteries of the modern science. Experimental evidences from cosmological and astrophysical observations in many different contexts, suggest the existence of dark matter particles that interact with ordinary matter mainly under the gravitational force. However, so far, all these particles evaded the detection and a direct proof of their existence is still missing.
To overcome this lack, novel complementary detection schemes are necessary to improve the actual limits and the performances of current detectors, opening thus the possibility to novel breakthrough discoveries.
This dissertation focuses on a research and development study for a new category of low-energy-threshold particle detector necessary to investigate low-energy-releases within the matter such as the direct investigation of dark matter composition.
In this thesis I will present two experimental schemes based on solid matrices of rare gas combined with the in-vacuum single electron detection technology. Small energy releases in unreactive materials, such as solid matrices of rare gas both pure and doped, can be probed exploiting also laser-assisted processes that up-convert the low-energy-release of the incident particle. These mechanisms should lead to a detectable electronic signal triggered by the incoming particle. In such a way, energy threshold ranging from meV to tens of eV could in principle be reached opening-up thus the possibility to probe theoretically well-motivated regions of unexplored electroweak parameter-space and thus test the existence of light dark matter candidates.
The work performed during the PhD period refers to the experimental research and development phases about: the rare gas crystals growing techniques and the corresponding set-ups, the electrons' extraction from rare gas crystals to the vacuum environment, and finally the spectroscopic studies on atomic species embedded into rare gas matrices.<br>Oggigiorno, numerose prove sperimentali indicano che il Modello Standard della fisica delle particelle non sia completo, in particolare, una delle questioni più importanti riguarda la composizione dell'Universo. Infatti, la materia ordinaria, che è il costituente di tutto ciò che conosciamo, sembra essere solamente una minima frazione dell'intera massa del Cosmo stesso. La parte sconosciuta della massa dell'Universo viene indicata con il termine materia oscura e rappresenta uno dei più grandi misteri della scienza contemporanea. Le evidenze sperimentali sia su scala astrofisica sia cosmologica in contesti diversi, suggeriscono l'esistenza di particelle di materia oscura che interagiscono con la materia ordinaria mediante la forza gravitazionale. Nonostante queste osservazioni, fino ad ora, queste particelle non sono state mai misurate direttamente e quindi una prova diretta della loro esistenza tutt'ora manca. Per cercare di sopperire a questa lacuna è necessario migliorare le performance dei rivelatori attuali tramite nuovi schemi di rivelazione complementari, aprendo così la possibilità a nuove scoperte fondamentali.
La presente dissertazione di dottorato si focalizza su uno studio di ricerca e sviluppo per una nuova categoria di rivelatori di particelle a bassa soglia energetica e a basso fondo. Tali approcci, necessari per investigare piccoli rilasci di energia nella materia, possono ad esempio essere applicabili allo studio della composizione particellare della materia oscura.
In questa tesi verranno presentati due schemi sperimentali entrambi basati su matrici cristalline di gas rari o nobili quali neon argon kripton e xenon sia puri sia drogati con metalli alcalini o terre rare. Assieme a questi solidi, si intende sfruttare la tecnologia della rivelazione di singole cariche in vuoto che può essere ottenuta mediante strumenti quali microchannel-plate o channetron. Piccoli rilasci di energia in materiali isolanti quali solidi di gas rari sia drogati sia puri, possono infatti essere sondati da processi che sfruttano fenomeni quali la laser up-conversion per rivelare particelle debolmente interagenti. In questo modo, una soglia energetica che varia dal meV a decine di eV può essere in principio raggiunta, aprendo la possibilità all'indagine di regioni inesplorate dello spazio dei parametri dell'interazione elettrodebole, testando così l'esistenza di candidati leggeri per la materia oscura.
Il lavoro che ho svolto durante il PhD riguarda la fase di ricerca e sviluppo relativa a: tecniche di crescita di cristalli di gas rari ed i relativi apparati sperimentali, l'estrazione di elettroni da questi solidi, ed infine studi spettroscopici su specie atomiche intrappolate all'interno di queste matrici cristalline.
10
Park, Jongmin. "CMOS analog spectrum processing techniques for cognitive radio applications." Diss., Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/37230.
Full textAbstract:
The objective of the research is to develop analog spectrum processing techniques for cognitive radio (CR) applications in CMOS technology. CR systems aim to use the unoccupied spectrum allocations without any license when the primary users are not present. Therefore, the successful deployment of CR systems relies on their ability to accurately sense the spectrum usage status over a wide frequency range serving various wireless communication standards. Meanwhile, to maximize the utilization of the available spectrum segments, the bandwidth of the signal has to be highly flexible, so that even a small fraction of spectrum resources can be fully utilized by CR users. One of the key enabling technologies of variable bandwidth communication is a tunable baseband filter.
In this research, a reconfigurable CR testbed system is presented as groundwork for the researches related with CR systems. With the feasibility study on the multi-resolution spectrum sensing (MRSS) functionality, a method for determining sensing threshold for MRSS functionality is presented, and a fully integrated MRSS receiver in CMOS technology is demonstrated. On the other hand, a reconfigurable CMOS analog baseband filter which can change its bandwidth, type and order with high resolution for CR applications is presented. In sum, an analog spectrum sensing method as well as a highly flexible analog baseband filter architecture is established and implemented in CMOS technology. Both designs are targeting the utilization of the analog signal processing capability with the aid of the digital circuits.
11
Ahmad, Salleh. "Développement et réalisation d'un circuit de microélectronique pour le détecteur spatial de rayons cosmiques JEM-EUSO." Thesis, Paris 11, 2012. http://www.theses.fr/2012PA112327.
Full textAbstract:
Extreme Universe Space Observatory on Japanese Experiment Module (JEM-EUSO) est conçu comme l’expérience de rayons cosmiques de prochaine génération pour observer les particules hautement énergétiques au-dessus de 10²⁰ eV. Le projet est mené par RIKEN et soutenu par une collaboration de plus de 200 membres provenant de 13 pays. Cet observatoire, sous la forme d'un télescope fluorescent, sera arrimé à la Station Spatiale internationale (ISS) pour un lancement prévu en 2017. En observant les gerbes atmosphériques produites dans la troposphère, à une altitude de 400 km, cet observatoire de rayons cosmique offrira une grande surface de détection, qui est au moins 100 fois supérieur que le plus grand détecteur de rayons cosmiques jamais construit. La surface focale de JEM-EUSO sera équipée d'environ 5000 unités de photomultiplicateur multianode 8x8 pixels (MAPMT). Un circuit intégré (ASIC), connu sous le nom SPACIROC, a été proposé pour la lecture du MAPMT. Cet ASIC de 64 voies propose des fonctionnalités comme le comptage de photons, la mesure des charges et le transfert de données à haute vitesse. Par-dessus tout, cet ASIC doit peu consommé afin de respecter la contrainte de puissance de JEM-EUSO. Réalisé en utilisant la technologie AMS Silicium-Germanium (SiGe) 0,35 µm, cet ASIC intègre 64 canaux de comptage de photons rapides (Photon Counting). La résolution de temps pour le comptage de photons est de 30 ns, ce qui permettra d’atteindre la valeur maximale comptage qui est de l'ordre de 10⁷ photons / s. Le système de mesure de charge est basé sur le Time-Over-Threshold qui offre 8 canaux de mesure. Chaque canal de mesure est une somme des 8 pixels du MAPMT et il est prévu que ce système est capable de mesurer jusqu'à 200 pC. La partie numérique fonctionne en continu et gère la conversion des données de chaque voie des blocs de Photon Counting et Time-Over-Threshold. Les données numériques sont transmises par l'intermédiaire de liaisons parallèles dédiées et ces opérations sont effectuées pendant une fenêtre de communication ou « Gate Time Unit » (GTU) de fréquence 400 kHz. Le taux de transfert des données d’ASIC avoisine les 200 Mbps ou 576 bits / GTU. La dissipation de puissance est strictement inférieure à 1 mW par canal ou 64 mW pour l'ASIC. Le premier prototype de SPACIROC a été envoyé pour fabrication en Mars 2010 au Centre Multi Projet (CMP). Des puces nues et packagés ont été reçues en Octobre 2010, ce qui a débuté la phase de caractérisation de cet ASIC. Après une phase de test réussie, des puces SPACIROC ont été intégrés dans l'électronique frontale d'un instrument pour détecter les sursauts gamma - Ultra Fast Flash Observatoire (UFFO) qui va être lancé en 2013. Vers la fin de l'année 2012, des cartes électroniques frontales conçues autour des puces SPACIROC ont été fabriqués pour le projet EUSO-Balloon. Ce projet de vol en ballon stratosphérique à une altitude de 40 km servira comme le démonstrateur technologique et l'ingénierie d'un instrument miniaturisé JEM-EUSO. La deuxième génération de cet ASIC a été envoyée à la fonderie en Décembre 2011. Ce second prototype, SPACIROC2, a été testé à partir de mai 2012. Les principales améliorations sont les suivantes: la consommation d'énergie a été revue à la baisse, ainsi que l'amélioration de la résolution temporelle de Photon Counting et l'extension de la gamme dynamique pour le module Time-Over-Threshold. Les mesures en cours ont montré que SPACIROC2 présente un bon comportement général et apporte des améliorations par rapport à son prédécesseur<br>Extreme Universe Space Observatory on Japanese Experiment Module (JEM-EUSO) is conceived as the next generation cosmic rays experiment for observing the highly energetic particles above 5.10¹⁹ eV. The project is lead by RIKEN and supported by an active collaboration of more than 200 members from 13 countries. This observatory, in the shape of a wide field-of-view UV telescope, will be attached to the International Space Station (ISS) for a planned launch in 2017. Observing the Air Showers generated in troposphere from an altitude of 400 km, this space based cosmic rays experiment will offer a very large instantaneous detection surface, which is at least 100 times bigger than the largest land based cosmic rays observatory. The detection surface of JEM-EUSO will be equipped with around 5000 units of 8x8 pixels Multianode Photomultiplier (MAPMT). A radiation hardened mixed signal application-specific integrated circuit (ASIC), known as SPACIROC, has been proposed for reading out the MAPMT. This ASIC features 64-channel analog inputs, fast photon counting capabilities, charge measurements and high-speed data transfer. Above all, the power dissipation of this ASIC is required to be very low in order to comply with the strict power budget of JEM-EUSO. By taking the advantages of high speed AMS 0.35 µm Silicon-Germanium (SiGe) process, this ASIC integrates 64 fast Photon Counting channels. The photon counting time resolution is 30 ns, which allows the theoretical counting rate in the order of 10⁷ photons/s. The charge measurement system is based on Time-Over-Threshold which offers 8 measurement channels. Each measurement channel is composed of 8 pixels of the MAPMT and it is expected that this system will measure up to 200 pC. The digital part is then required to operate continuously and handles data conversion of each Photon Counting and Time-Over-Threshold channel. For the first version of this ASIC, one channel measurement channel for the dynode is also available. The digital data are transmitted via dedicated parallel communication links and within the defined Gate Time Unit (GTU) of 400 kHz frequency. The ASIC data output rate is in the vicinity of 200 Mbps or 576 bits/GTU. The power dissipation is kept strictly below 1 mW per channel or 64 mW for the ASIC. The first prototype of SPACIROC was sent for tapeout in March 2010 through Centre Multi Projet (CMP) prototyping services. The packaged ASICs and bare dies have been received in October 2010 which marked the characterization phase of this chip. After successful testing phase, SPACIROC chips were integrated into the front-end electronics of an instrument pathfinder for detecting the gamma ray bursts – Ultra Fast Flash Observatory (UFFO) which is foreseen to be launched in 2013. Towards the end of 2012, front-end board designed around SPACIROC chips have been fabricated for the EUSO-Balloon project. This balloon borne project will serve as a technical and engineering demonstrator of a fully miniaturized JEM-EUSO instrument which will be flown to the stratosphere at the altitude of 40 km. The second tapeout of this ASIC was done in December 2011. This second prototype, SPACIROC2, was tested from May 2012. The main improvements are as follows: lower power consumption due to better power management, enhancement in Photon Counting time resolution and extension the Time-Over-Threshold maximum input rate. The ongoing tests have shown that SPACIROC2 exhibits a good overall behavior and improvement compared to its predecessor
12
Lautenbach, Klemens [Verfasser]. "High Speed Data Multiplexer for the Belle II Pixel Detector & Search for an Exotic Resonance at the D*0 anti-D*0 Threshold in Charged B Meson Decays / Klemens Lautenbach." Gießen : Universitätsbibliothek, 2021. http://d-nb.info/1228829225/34.
Full text
13
Banschbach, David C. "Optimizing systems of threshold detection sensors." Thesis, Monterey, Calif. : Naval Postgraduate School, 2008. http://bosun.nps.edu/uhtbin/hyperion-image.exe/08Mar%5FBanschbach.pdf.
Full textAbstract:
Thesis (M.S. in Operations Research)--Naval Postgraduate School, March 2008.<br>Thesis Advisor(s): Fricker, Ronald D. "March 2008." Description based on title screen as viewed on April 28, 2008. Includes bibliographical references (p. 59-62). Also available in print.
14
Bask, Michael. "Dynamic threshold generators for robust fault detection." Doctoral thesis, Luleå, 2005. http://epubl.luth.se/1402-1544/2005/11.
Full text
15
Oškera, Jan. "Detekce dopravních značek a semaforů." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2020. http://www.nusl.cz/ntk/nusl-432850.
Full textAbstract:
The thesis focuses on modern methods of traffic sign detection and traffic lights detection directly in traffic and with use of back analysis. The main subject is convolutional neural networks (CNN). The solution is using convolutional neural networks of YOLO type. The main goal of this thesis is to achieve the greatest possible optimization of speed and accuracy of models. Examines suitable datasets. A number of datasets are used for training and testing. These are composed of real and synthetic data sets. For training and testing, the data were preprocessed using the Yolo mark tool. The training of the model was carried out at a computer center belonging to the virtual organization MetaCentrum VO. Due to the quantifiable evaluation of the detector quality, a program was created statistically and graphically showing its success with use of ROC curve and evaluation protocol COCO. In this thesis I created a model that achieved a success average rate of up to 81 %. The thesis shows the best choice of threshold across versions, sizes and IoU. Extension for mobile phones in TensorFlow Lite and Flutter have also been created.
16
Lehtomäki, J. (Janne). "Analysis of energy based signal detection." Doctoral thesis, University of Oulu, 2005. http://urn.fi/urn:isbn:9514279255.
Full textAbstract:
Abstract
The focus of this thesis is on the binary signal detection problem, i.e., if a signal or signals are present or not. Depending on the application, the signal to be detected can be either unknown or known. The detection is based on some function of the received samples which is compared to a threshold. If the threshold is exceeded, it is decided that signal(s) is (are) present. Energy detectors (radiometers) are often used due to their simplicity and good performance. The main goal here is to develop and analyze energy based detectors as well as power-law based detectors.
Different possibilities for setting the detection threshold for a quantized total power radiometer are analyzed. The main emphasis is on methods that use reference samples. In particular, the cell-averaging (CA) constant false alarm rate (CFAR) threshold setting method is analyzed. Numerical examples show that the CA strategy offers the desired false alarm probability, whereas a more conventional strategy gives too high values, especially with a small number of reference samples.
New performance analysis of a frequency sweeping channelized radiometer is presented. The total power radiometer outputs from different frequencies are combined using logical-OR, sum and maximum operations. An efficient method is presented for accurately calculating the likelihood ratio used in the optimal detection. Also the effects of fading are analyzed. Numerical results show that although sweeping increases probability of intercept (POI), the final probability of detection is not increased if the number of observed hops is large.
The performance of a channelized radiometer is studied when different CFAR strategies are used to set the detection threshold. The proposed iterative methods for setting the detection threshold are the forward consecutive mean excision (FCME) method with the CA scaling factors in final detection decision (FCME+CA), the backward consecutive mean excision (BCME) method with the CA scaling factors in detection (BCME+CA) and a method that uses the CA scaling factors for both censoring and detection (CA+CA). Numerical results show that iterative CFAR methods may improve detection performance compared to baseline methods.
Finally, a method to set the threshold of a power-law detector that uses a nonorthogonal transform is presented. The mean, variance and skewness of the decision variable in the noise-only case are derived and these are used to find a shifted log-normal approximation for the distribution of the decision variable. The accuracy of this method is verified through simulations.
17
Malefahlo, Eliab. "Measuring the quasar luminosity function below the detection threshold." University of the Western Cape, 2016. http://hdl.handle.net/11394/4956.
Full textAbstract:
>Magister Scientiae - MSc<br>The radio emission of radio-quiet active galactic nuclei (AGN) is thought to be from star formation and AGN related emission. I investigate these sources using 1.4 GHz radio data from FIRST and three optical quasars samples from the SDSS: (i) a volume-limited sample in the redshift range 0:2 < z < 0:4 defined by Mi < -23 (ii) magnitude-limited sample in the redshift range 1:8 < z < 2:5 defined by mr ≤ 18:5 and (iii) a uniform sample in the redshift range 0:2 < z < 3:5 (divided into 12 redshift bins). I constructed radio source counts and radio luminosity functions (RLFs) using the optical quasars detected in FIRST, which are consistent with literature results obtained using SDSS and NVSS quasars. There are differences at the low uxs end because of the different resolutions of FIRST and NVSS. I applied a median stack method to the 12 redshift bins of the uniform sample and found that the median ux decreases from 182 µJy in the lowest redshift bin to 39 µJy and the
highest redshift bin. This is because the high redshift quasars although more luminous than their low redshift counterparts, they are much further away so they have lower uxes. I probed the quasar radio source counts to lower levels using reconstructed source counts obtained by applying the Bayesian stack technique. The reconstructed radio source counts were then used to constructed the quasar
RLF to lower levels, where I found: (i) for z < 1 the constructed quasar RLF has the same slope as the detected quasars, suggesting that like the detect quasars their radio emission is dominated by AGN related emission (ii) above z = 1 the constructed RLF steepens with redshift, which suggests the strong link between accretion rate and radio jet power is gradually breaking down towards faint
optical luminosities at high redshift.<br>National Astrophysics and Space Science Program (NASSP) and SKA Africa
18
Jude, Thomas. "Strangeness photoproduction off the proton at threshold energies." Thesis, University of Edinburgh, 2010. http://hdl.handle.net/1842/4769.
Full textAbstract:
K+Λ photoproduction provides the best possibility for a model independent extraction of the photoproduction process and contributing resonances. To do this, it is vital that cross section measurements are well understood. This thesis presents pγ K+Λ differential cross sections from the reaction threshold, to an invariant centre of mass energy of 1.87 GeV. The data was taken at MAMI-C electron microtron facility in Mainz, Germany, during July 2007 and April 2009. The 1.5 GeV MAMI-C electron beam was used to produce an energy tagged bremsstrahlung photon beam with a maximum energy of 1.4 GeV and an intensity of 105γs-1MeV-1. The beam impinged upon a liquid hydrogen target, with reaction products detected in two segmented calorimeter arrays; the Crystal Ball detector and TAPS. This work pioneers a new method of K+ detection in segmented calorimeters, in which the K+ was identified from the signature of its weak decay inside the crystals of the calorimeter. This proved to be an excellent method of isolating K+ and accessing strangeness photoproduction channels, with good agreement between experimental and Geant4 simulated data. A novel method in seperating K+Λ and K+Σ0 final states was also developed by identifying the photon from the decay: Σ0 → Λγ. The intense photon beam at the MAMI-C facility enabled differential cross section data with greater invariant mass resolution than previous measurements. The new measurement near threshold imposes important constraints to effective field theories based on the approximate chiral symmetry of QCD. At higher centre of mass energies it also addresses the current problem of discrepant data sets and will form an important constraint on partial wave analysis for the nucleon excitation spectrum. As such, this work contributes to a major world wide programme aiming to extract the excitation spectrum of the nucleon and to understand the dynamics and interactions of its constituents. The greater statistics near threshold, and particularly at backwards K+ centre of mass angles will give new valuable constraints to contributions from meson and hyperonic resonances on the reaction mechanism. The high resolution of the photon beam (approximately 2 MeV) also allows the first search for narrow resonances coupling to KΛ final states. The differential cross sections give good agreement with Kaon-MAID partial wave solutions, apart from at backward angles close to threshold, where the data is lower. Near threshold, the data agrees with calculations from the chiral unitary framework of Borasoy et al, tending to be in better accordance with the model than previous data. No strong structure from potential narrow resonance states was observed over the centre of mass energy region of 1650-1700 MeV, where narrow structure has been observed in recent η photoproduction of the neutron.
19
Aktar, Tugba. "Determining the detection threshold for perception of selected textural attributes." Thesis, University of Leeds, 2015. http://etheses.whiterose.ac.uk/10753/.
Full textAbstract:
Texture perception and appreciation was found to be one of the determinative factors for preference, which lead to business success. Moreover, it was claimed to be vital for safe consumption in some cases for the vulnerable population (i.e. elderlies, babies or dysphagic patients). To create more desirable, preferable or safer foods it is necessary to understand the perception limits of the textural attributes and investigate if there are any correlations between other possible sensation systems. This study is motivated with the aim of finding thresholds for the selected attributes of texture (liquid viscosity, soft-solid firmness, soft-solid elasticity and solid surface roughness) and explore whether there is any correlation between texture sensation and tactile sensation systems, which was claimed to be responsible for texture sensation. Current study was examined with sensory tests on the fingertip and tongue for the textural attributes perception thresholds. Tactile sensation limits were observed with touch sensitivity tests and two-point discrimination tests. For each attribute, correlations with the tactile sensitivity were tested. Results revealed that the tactile sensation was not directly determinative in texture discrimination and correlation between texture discrimination and tactile sensation was not possible to be established for those attributes. Another approach was comparing the sensitivities between the fingertip and tongue. These two parts of the body seemed to have similar texture sensitivity, excluding the fluid viscosity. Due to this general similarity in discrimination of texture, we suggested that one could use fingertip texture discrimination threshold to predict the tongue threshold. Findings of this study have implications in the food industry and can contribute to the general understanding of the sensory scientists. For industry, obtained thresholds for particular attributes could be used as guidance for creating desirable food products. Moreover, if the same approach could be followed, thresholds for the vulnerable groups can be obtained and used for medical food production for creating safe to consume foods. On the other hand, methodologies and findings of this study could provide information to sensory scientists to map the full image of the texture sensation thresholds.
20
Valluri, Sasanka. "DETECTION OF THE R-WAVE IN ECG SIGNALS." Master's thesis, University of Central Florida, 2005. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2122.
Full textAbstract:
This thesis aims at providing a new approach for detecting R-waves in the ECG signal and generating the corresponding R-wave impulses with the delay between the original R-waves and the R-wave impulses being lesser than 100 ms. The algorithm was implemented in Matlab and tested with good results against 90 different ECG recordings from the MIT-BIH database. The Discrete Wavelet Transform (DWT) forms the heart of the algorithm providing a multi-resolution analysis of the ECG signal. The wavelet transform decomposes the ECG signal into frequency scales where the ECG characteristic waveforms are indicated by zero crossings. The adaptive threshold algorithms discussed in this thesis search for valid zero crossings which characterize the R-waves and also remove the Preventricular Contractions (PVC's). The adaptive threshold algorithms allow the decision thresholds to adjust for signal quality changes and eliminate the need for manual adjustments when changing from patient to patient. The delay between the R-waves in the original ECG signal and the R-wave impulses obtained from the algorithm was found to be less than 100 ms.<br>M.S.<br>Department of Electrical and Computer Engineering<br>Engineering and Computer Science<br>Electrical Engineering
21
Strömberg, Dino. "Adaptive detection threshold control for an experimental low-cost ultra wide band energy detection receiver." Thesis, KTH, Signalbehandling, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-53526.
Full text
22
Ahn, Seung Choon. "Variable threshold detection with weighted PCM signal transmitted over Gussian channel." Ohio : Ohio University, 1986. http://www.ohiolink.edu/etd/view.cgi?ohiou1183126123.
Full text
23
Fairbanks, Rollin J. III. "Algorithms refinement and threshold determination for a drowsy driver detection system." Thesis, Virginia Tech, 1995. http://hdl.handle.net/10919/41746.
Full textAbstract:
Research conducted over the past three years in the Vehicle Analysis and Simulation Laboratory at Virginia Tech has resulted in the development and validation of algorithms for the detection of driver drowsiness. Specifically, the goal of the research has been to develop the best possible drowsiness-detection algorithms using measures that can be computed while a vehicle is in motion with minimal interference with the driver. The results of these studies, which have been previously reported, generally support the feasibility of drowsy-driver detection and indicate that further analysis and refinement of the algorithms is warranted. This thesis researches several methods of refining existing driver-status algorithms, the integration of driver-performance deterioration measures, and the selection of appropriate alarm thresholds to be used in test and evaluation study.
The results of five algorithm optimization refinements are described. Chapter 2 reports that the elimination of outlier dependent measure data prior to algorithm development was found not to improve algorithm accuracy. Chapter 3 describes that the addition of cross product and squared terms to the algorithms did not provide consistent improvement in algorithm accuracy. Chapter 4 reports that, although time-on-task variables were found to have some improved capability, they did not consistently add to the accuracy of the algorithms.<br>Master of Science
24
Ahn, Seung Choon. "Variable threshold detection with weighted PCM signal transmitted over Guassian channel." Ohio University / OhioLINK, 1986. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1183126123.
Full text
25
Fairbanks, Rollin J. "Algorithms refinement and threshold determination for a drowsy driver detection system /." This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-03242009-040357/.
Full text
26
Duggins, Jonathan William. "Parametric Resampling Methods for Retrospective Changepoint Analysis." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/28146.
Full textAbstract:
Changepoint analysis is a useful tool in environmental statistics in that it provides a methodology for threshold detection and modeling processes subject to periodic changes in the underlying model due to anthropogenic effects or natural phenomena. Several applications of changepoint analysis are investigated here. The use of inappropriate changepoint detection methods is first discussed and the need for a simple, flexible, correct method is established and such a method is proposed for the mean-shift model. Data from the Everglades, Florida, USA is used to showcase the methodology in a real-world setting. An extension to the case of time-series data represented via transition matrices is presented as a result of joint work with Matt Williams (Department of Statistics, Virginia Tech) and rainfall data from Kenya, Africa is presented as a case-study. Finally the multivariate changepoint problem is addressed by a two-stage approach beginning with dimension reduction via principal component analysis (PCA). After the dimension reduction step the location of the changepoint in principal component space is estimated and assuming at most one change in a mean-shift setting, all possible sub-models are investigated.<br>Ph. D.
27
Kuhner, Joseph T. "Automating the Detection of Precipitation and Wind Characteristics in Navy Ocean Acoustic Data." ScholarWorks@UNO, 2018. https://scholarworks.uno.edu/td/2567.
Full textAbstract:
A challenge in Underwater Acoustics is identifying the independent variables associated with an environment’s ambient noise. A strict definition of ambient noise would focus on non-transient signatures and exclude transient impacts from marine mammals, pelagic fish species, man-made sources, or weather events such as precipitation or wind speeds. Recognizing transient signatures in acoustic spectra is an essential element for providing environmental intelligence to the U.S. Navy, specifically the acoustic signatures from meteorological events. While weather event detection in acoustic spectra has been shown in previous studies, leveraging these concepts via U.S. Navy assets is largely an unknown. Environmental intelligence collection can be improved by detecting precipitation events and establishing wind velocities with acoustic signatures. This will further improve meteorological models by enabling validation from both manned and unmanned sub-surface assets.
28
Gheiratmand, Mina. "Orientation tuning in human color vision at detection threshold: a psychophysical approach." Thesis, McGill University, 2014. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=123169.
Full textAbstract:
Object processing is an essential task of the human visual system that is thought to beaccomplished through hierarchical processing of objects attributes in the ventral occipitotemporal cortex. An object can primarily be delineated by its shape and surface information,including its color and texture. A shape can initially be defined as a set of oriented elementsdefined in luminance or color contrast. It is now thought that red-green color vision can detectcolor-defined edges almost as well as luminance vision can detect luminance-defined edges. Thisis supported by evidence from both psychophysical experiments and single cell recordings.However, it is not yet well understood how color contrast is used by the visual system in formprocessing. Color vision can have an important additional role to luminance vision in objectperception, by processing the surface color of an object. Evidence from single cell recordings inprimates have shown the presence of a neurons population of about 10% in V1 that respondexclusively to full field color stimuli and are not tuned to spatial frequency or orientation,making them candidates for surface color processing. Psychophysical experiments, however,have not revealed any direct evidence for non-oriented color mechanisms.In this thesis I use the psychophysical method of subthreshold summation to determine theorientation tuning of the red-green color mechanisms in human vision, and for luminancecontrast under equivalent conditions. Psychophysical models, based on the presence of multipletuned detectors or a single, non-oriented mechanism, are used to determine tuning properties ofthe neural detectors underlying the psychophysical responses.The first set of experiments revealed evidence for two types of red-green color mechanism: 1)non-oriented revealed monocularly at low spatial frequencies (0.25-0.375 cycles/degree), and 2)oriented that appeared binocularly or at higher spatial frequencies (1.5 cycles/degree). Inluminance vision, evidence supported the presence of orientation tuning at all spatial scales andviewing conditions. Based on these findings, further experiments were done to measure the fullmonocular orientation tuning responses of color vision, in comparison to luminance vision, atdifferent spatial scales. At mid spatial frequencies, similar orientation tuning responses andneural detector bandwidth estimates were found for color and luminance vision (16 and 13 degsrespectively). At low spatial frequencies, tuning curves for color contrast were extremely broadand fitted reasonably by a model involving isotropic detectors. For luminance vision, orientationtuning is preserved with no change in detector bandwidth. Finally, binocular responses weremeasured using dichoptic chromatic stimuli that revealed orientation tuning at both low and midspatial frequencies. In summary, the results of this thesis have revealed the presence of twodistinct pathways in color vision at the behavioral level that are best equipped, respectively forthe representation of an object's surface-color and form, and have provided estimates of theorientation bandwidth of their underlying neural detectors.<br>Le traitement des objets est une tache essentielle pour le système visuel humain que l'on penseêtre accomplie à travers un traitement hiérarchique des attributs de l'objet dans la régionoccipito-temporale ventrale du cerveau. Premièrement un objet peut être délimité par sesinformations de forme et de surface, ce qui inclut sa couleur et sa texture. La forme peut êtreinitialement définie comme un groupe d'éléments orientés définis par leur contraste enluminance ou couleur. On pense maintenant que la vision de la couleur rouge-verte est capablede détecter des arêtes définies par leur couleur presque aussi bien que la vision de la luminancepeut détecter des arêtes définies par leur luminances. Les preuves a l'appui proviennent à la foisd'expériences en psychophysique et d'enregistrements électrophysiologiques cellule simple.Cependant on ne comprend pas encore très bien comment le contraste en couleur est utilise par lesystème visuel pour le traitement de la forme. La vision de la couleur peut avoir un rôleadditionnel important pour la vision de la luminance dans la perception des objets, en traitant lacouleur de la surface de l'objet. Des preuves provenant d'enregistrements cellule simple ontmontré l'existence d'une population de neurones - représentant environ 10% des neurones de V1- qui répond exclusivement aux stimuli couleur plein champ et qui n'est sensible ni à lafréquence spatiale ni à l'orientation, ce qui rend ces neurones de bon candidats pour le traitementdes surfaces colorées. En revanche, aucune expérience en psychophysique n'a mise en évidenceun mécanisme couleur non-orienté.Dans cette thèse j'utilise la méthode psychophysique de sommation subliminaire pour déterminerla sélectivité aux orientations et la sensibilité au contraste de luminance des mécanismes de lacouleur rouge-verte dans la vision humaine avec des conditions comparables. Des modèlespsychophysiques basés sur l'existence, soit de multiples détecteurs sensibles à l'orientation, soitd'un unique mécanisme non-orienté, ont été utilisés pour déterminer les propriétés de sensibilitédes détecteurs neuraux qui sous-tendent les réponses psychophysiques.Un premier groupe d'expériences a révélé l'existence de deux types de mécanisme de la couleurrouge-verte: 1) un mécanisme non-orienté qui a été mis en évidence en vision monoculaire et ce,à basses fréquences spatiales (0.25-0.375 cycles/degré) et 2) un mécanisme sensible àl'orientation qui est apparue en vision binoculaire mais également à haute fréquence spatiale (1.5cycles/degré). Dans la vision de la luminance les preuves supportent l'existence de mécanismessensibles à l'orientation pour toutes les fréquences spatiales et pour toutes les conditions de vue.Au regard de ces résultats, les expériences suivantes ont été menées afin de mesurer le spectreentier de la sensibilité aux orientations de la vision de la couleur sous condition monoculaire, dele comparer à celui de la vision de la luminance et ce, à différentes échelles spatiales. Pour lesfréquences spatiales intermédiaires, la vision de la couleur et la vision de la luminanceprésentaient des réponses de sensibilité aux orientations semblables et des estimations de bandespassantessimilaires pour les détecteurs neuraux. Pour les basses fréquences spatiales, les courbesde sensibilité au contraste de couleur étaient très larges et s'expliquaient raisonnablement bien àl'aide d'un modèle impliquant des détecteurs isotropiques. Dans le cas de la vision de laluminance, la sensibilité aux orientations est préservée sans changement de bandes-passantes dudétecteur. Enfin les réponses binoculaires ont été mesurées à l'aide de stimuli chromatiquesprésentés de façon dichoptique pour révéler en même temps la sensibilité aux orientations dansles basses fréquences spatiales et dans les fréquences spatiales intermédiaires.
29
Gan, Linmin. "Adaptive Threshold Method for Monitoring Rates in Public Health Surveillance." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/37721.
Full textAbstract:
We examine some of the methodologies implemented by the Centers for Disease Control and Preventionâ s (CDC) BioSense program. The program uses data from hospitals and public health departments to detect outbreaks using the Early Aberration Reporting System (EARS). The EARS method W2 allows one to monitor syndrome counts (W2count) from each source and the proportion of counts of a particular syndrome relative to the total number of visits (W2rate). We investigate the performance of the W2r method designed using an empiric recurrence interval (RI) in this dissertation research. An adaptive threshold monitoring method is introduced based on fitting sample data to the underlying distributions, then converting the current value to a Z-score through a p-value. We compare the upper thresholds on the Z-scores required to obtain given values of the recurrence interval for different sets of parameter values. We then simulate one-week outbreaks in our data and calculate the proportion of times these methods correctly signal an outbreak using Shewhart and exponentially weighted moving average (EWMA) charts. Our results indicate the adaptive threshold method gives more consistent statistical performance across different parameter sets and amounts of baseline historical data used for computing the statistics. For the power analysis, the EWMA chart is superior to its Shewhart counterpart in nearly all cases, and the adaptive threshold method tends to outperform the W2 rate method. Two modified W2r methods proposed in the dissertation also tend to outperform the W2r method in terms of the RI threshold functions and in the power analysis.<br>Ph. D.
30
Rinzan, Mohamed Buhary. "Threshold extension of gallium arsenide/aluminum gallium arsenide terahetrz detectors and switching in heterostructures." unrestricted, 2006. http://etd.gsu.edu/theses/available/etd-10102006-204618/.
Full textAbstract:
Thesis (Ph. D.)--Georgia State University, 2006.<br>Title from title screen. Unil Perera, committee chair; Donald Edwards, Gennady Cymbaluyk, Mark Stockman, Nikolaus Dietz, Paul Wiita, committee members. Electronic text (348, 24-32 p. : ill.) : digital, PDF file. Description based on contents viewed June 8, 2007. Includes bibliographical references (p. 24-30, second sequence).
31
Tarjan, Aaron. "Development of a Decision Support Tool to Test Energy Management Alarming Thresholds." Scholarly Repository, 2011. http://scholarlyrepository.miami.edu/oa_theses/249.
Full textAbstract:
A novel model was developed to test the use of short data sets for testing various alarm thresholds as part of an energy management program. Several years of 15-minute interval data were utilized from five buildings in Jacksonville, Florida. The model aggregated the data by day type and occupancy so that there were four period types used. For all of the buildings’ meters, their daily usage by period type was tested against the threshold to determine if an alarm would be triggered, which would then be assigned a reward and cost based upon the type and duration of response. The risk management value was converted to dollars, in order to normalize the energy and time. It was determined that the 5-month short data set was the most appropriate choice for short data sets. In addition, it was concluded that the thresholds should be set between 0.8 and 1.0 standard deviation above the average of the short window. Several recommendations for further study are also enclosed.
32
Angel, Rebecca. "Cortical auditory evoked potentials to estimate gap-detection thresholds in adults." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/59532.
Full textAbstract:
Temporal resolution is the ability of the auditory system to detect small changes over time and is an important component for the detection and decoding of speech by the central auditory nervous system. Temporal resolution is most often measured by asking a person to detect small gaps between sounds, known as behavioural gap-detection tests. However, certain populations may be unable or unwilling to respond reliably due to perceptual or cognitive deficits, or in medico-legal compensation cases. There are limitations to behavioural gap-detection measures because they cannot separate cognitive from perceptual deficits. The present study utilized electrophysiological gap-detection measures as a means of objectively estimating behavioural gap-detection thresholds. Cortical auditory evoked potentials (CAEPs) are neural responses to changes in sound, duration, and frequency that can be measured from the scalp. The specific aim of this study was to collect adult normative data for CAEP gap-detection thresholds to examine if CAEPs could accurately estimate behavioural gap-detection thresholds. Gap-evoked CAEPs could be recorded in participants who were awake and passively listening and could estimate temporal resolution without the need for a participant’s cooperation or attention. The results showed that there was a significant N1-P2 response to gaps at ≥ 4 ms, with 85% of participants having a response to a 10 ms gap. Additionally, the electrophysiological mean gap-detection threshold was within 1 ms of behavioral mean gap-detection threshold. This demonstrated that gap-evoked CAEPs can accurately estimate behavioural gap-detection thresholds in a normal hearing adult population.<br>Medicine, Faculty of<br>Audiology and Speech Sciences, School of<br>Graduate
33
Wang, Yue. "Low threshold organic semiconductor lasers and their application as explosive sensors." Thesis, University of St Andrews, 2012. http://hdl.handle.net/10023/3491.
Full textAbstract:
This thesis presents studies of organic semiconductor lasers, including their operation when pumped by a light-emitting diode (LED), and their application as explosive sensors. The photophysics and amplified spontaneous emission (ASE) of star-shaped oligofluorene truxene molecules were investigated. These materials exhibit high gain and low optical loss in thin-film waveguides. Low ASE thresholds were achieved with the truxene T3 and T4. Second-order distributed feedback (DFB) lasers were fabricated, with pump threshold intensities below 0.5 kW/cm² and broad tunability of the emission. DFB lasers were demonstrated with a novel polymer BBEHP-PPV, pumped by a pulsed commercial InGaN LED. The laser emission occurred at 533 nm for peak drive current above 15 A. The output beams and pulse-dynamics of the lasers were investigated for the first time, along with a 'double-threshold' phenomenon that was observed in this long-pulse pumping regime. BBEHP-PPV lasers based on various types of diffractive resonators were also fabricated by UV nanoimprint-lithography (NIL). By optimising the resonator design and the fabrication, and the pump-beam geometry, polymer laser thresholds of ~60 W/cm², the lowest recorded for NIL lasers, were demonstrated, enabling them to be pumped by pulsed commercial LEDs and custom micro-LED arrays. One promising application of organic lasers is in explosive sensing. A polymer of intrinsic microporosity (PIM-1) was used to detect nitroaromatic vapours. Rapid detection of dinitrobenzene (DNB) of low vapour pressure was achieved by monitoring the photoluminescence and laser emission during exposure. In addition, a CMOS time-resolved fluorescence lifetime microsystem with a commercial green-emitting copolymer was used as a novel, portable sensor to detect DNB vapour. An InGaN LED pumped BBEHP-PPV laser was also used as a miniature sensor to detect 10 ppb of DNB. These highly sensitive hybrid sensors could be used in humanitarian demining, complementing existing technologies leading to improvement in the detection of hazardous objects.
34
Weidemann, Bonnie Diane. "Monitoring Land-Cover Change in the Las Vegas Valley: A Study of Five Change Detection Methods in an Urban Environment." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3539.
Full textAbstract:
Change detection is currently a topic of great interest to theoretic geographic researchers. The necessity to map, monitor, and model land cover change is also important to a variety of applied fields as varied as urban planning and military intelligence. This research compares five algorithms to map urban land cover change in the greater Las Vegas, Nevada metropolitan area. Landsat Thematic Mapper imagery acquired on May 1990 and May 2000 was used as the primary data. The change detection methods yielded simple maps of change vs. no change. These algorithms included image differencing, image ratioing, image regression, vegetation index differencing, and principal components analysis. Each of these techniques accurately identified areas of land cover with moderate levels of accuracy and produced overall change detection accuracy values between 60% and 76% depending on the method. The highest accuracy was obtained by the image ratioing method using the red spectral band (76%). As expected, the determination of change detection thresholds for each technique was critical to the accuracy produced by the algorithm. Moreover, the type of statistic used in optimizing that threshold was also a significant impacting the final accuracy. The approach of using a set of ground points to calibrate the change detection threshold proved to have significant merit.
35
Saghaian, Nejad Esfahani Sayed Mahdi. "STATISTICAL MODELS FOR CONSTANT FALSE-ALARM RATE THRESHOLD ESTIMATION IN SOUND SOURCE DETECTION SYSTEMS." UKnowledge, 2010. http://uknowledge.uky.edu/gradschool_theses/46.
Full textAbstract:
Constant False Alarm Rate (CFAR) Processors are important for applications where thousands of detection tests are made per second, such as in radar. This thesis introduces a new method for CFAR threshold estimation that is particularly applicable to sound source detection with distributed microphone systems. The novel CFAR Processor exploits the near symmetry about 0 for the acoustic pixel values created by steered-response coherent power in conjunction with a partial whitening preprocessor to estimate thresholds for positive values, which represent potential targets.
To remove the low frequency components responsible for degrading CFAR performance, fixed and adaptive high-pass filters are applied. A relation is proposed and it tested the minimum high-pass cut-off frequency and the microphone geometry.
Experimental results for linear, perimeter and planar arrays illustrate that for desired false alarm (FA) probabilities ranging from 10-1 and 10-6, a good CFAR performance can be achieved by modeling the coherent power with Chi-square and Weibull distributions and the ratio of desired over experimental FA probabilities can be limited within an order of magnitude.
36
Al, Tobi Amjad Mohamed. "Anomaly-based network intrusion detection enhancement by prediction threshold adaptation of binary classification models." Thesis, University of St Andrews, 2018. http://hdl.handle.net/10023/17050.
Full textAbstract:
Network traffic exhibits a high level of variability over short periods of time. This variability impacts negatively on the performance (accuracy) of anomaly-based network Intrusion Detection Systems (IDS) that are built using predictive models in a batch-learning setup. This thesis investigates how adapting the discriminating threshold of model predictions, specifically to the evaluated traffic, improves the detection rates of these Intrusion Detection models. Specifically, this thesis studied the adaptability features of three well known Machine Learning algorithms: C5.0, Random Forest, and Support Vector Machine. The ability of these algorithms to adapt their prediction thresholds was assessed and analysed under different scenarios that simulated real world settings using the prospective sampling approach. A new dataset (STA2018) was generated for this thesis and used for the analysis. This thesis has demonstrated empirically the importance of threshold adaptation in improving the accuracy of detection models when training and evaluation (test) traffic have different statistical properties. Further investigation was undertaken to analyse the effects of feature selection and data balancing processes on a model's accuracy when evaluation traffic with different significant features were used. The effects of threshold adaptation on reducing the accuracy degradation of these models was statistically analysed. The results showed that, of the three compared algorithms, Random Forest was the most adaptable and had the highest detection rates. This thesis then extended the analysis to apply threshold adaptation on sampled traffic subsets, by using different sample sizes, sampling strategies and label error rates. This investigation showed the robustness of the Random Forest algorithm in identifying the best threshold. The Random Forest algorithm only needed a sample that was 0.05% of the original evaluation traffic to identify a discriminating threshold with an overall accuracy rate of nearly 90% of the optimal threshold.
37
Harshman, D. K., B. M. Rao, J. E. McLain, G. S. Watts, and J. Y. Yoon. "Innovative qPCR using interfacial effects to enable low threshold cycle detection and inhibition relief." AAAS, 2015. http://hdl.handle.net/10150/621255.
Full textAbstract:
UA Open Access Publishing Fund<br>Molecular diagnostics offers quick access to information but fails to operate at a speed required for clinical decision-making. Our novel methodology, droplet-on-thermocouple silhouette real-time polymerase chain reaction (DOTS qPCR), uses interfacial effects for droplet actuation, inhibition relief, and amplification sensing. DOTS qPCR has sample-to-answer times as short as 3 min 30 s. In infective endocarditis diagnosis, DOTS qPCR demonstrates reproducibility, differentiation of antibiotic susceptibility, subpicogram limit of detection, and thermocycling speeds of up to 28 s/cycle in the presence of tissue contaminants. Langmuir and Gibbs adsorption isotherms are used to describe the decreasing interfacial tension upon amplification. Moreover, a log-linear relationship with low threshold cycles is presented for real-time quantification by imaging the droplet-on-thermocouple silhouette with a smartphone. DOTS qPCR resolves several limitations of commercially available real-time PCR systems, which rely on fluorescence detection, have substantially higher threshold cycles, and require expensive optical components and extensive sample preparation. Due to the advantages of low threshold cycle detection, we anticipate extending this technology to biological research applications such as single cell, single nucleus, and single DNA molecule analyses. Our work is the first demonstrated use of interfacial effects for sensing reaction progress, and it will enable point-of-care molecular diagnosis of infections.
38
De, Witt Corn e. Juan. "Investigating the threshold of event detection with application to earthquake and operational risk theory." Diss., University of Pretoria, 2013. http://hdl.handle.net/2263/79227.
Full textAbstract:
This study provides systematic analysis of points of structural change in probability distributions.
In observed frequency data of earthquakes, such a threshold exists due to the non-detection of events
below a certain magnitude. By examining the factors in
uencing the operational risk exposure of
institutions, a similar threshold is hypothesized to exist in operational loss data. In both elds of
study, this threshold is termed the threshold of completeness, above which 100% of events are de-
tected. External factors have caused this level of completeness to shift over time for earthquake data.
The level of complete recording in
uences the volume of data that can be consistently incorporated
in a study of seismic activity. Such data can be used by re-insurers and direct writers of catastrophe
agreements who deal in seismic hazard. Historically, a variety of methods have been proposed by
authors in an attempt to gauge the location of the threshold of completeness in earthquake data.
This study aims to evaluate the e cacy of some of the most prominent methods under di ering
assumptions regarding the incomplete portion of the data. Furthermore, a new threshold estimation
scheme (MITC) is developed and tested against the prevailing methods. Additionally, earthquake
data and the wealth of literature will aid in introductory analysis and assessing applicability of esti-
mation techniques in the context of operational losses.<br>Dissertation (MSc)--University of Pretoria, 2013.<br>Actuarial Sciences<br>MSc<br>Unrestricted
39
Moussa, Georges Fouad Mr. "EARLY FOREST FIRE DETECTION USING TEXTURE, BLOB THRESHOLD, AND MOTION ANALYSIS OF PRINCIPAL COMPONENTS." DigitalCommons@CalPoly, 2012. https://digitalcommons.calpoly.edu/theses/881.
Full textAbstract:
Forest fires constantly threaten ecological systems, infrastructure and human lives. The purpose behind this study is minimizing the devastating damage caused by forest fires. Since it is impossible to completely avoid their occurrences, it is essential to accomplish a fast and appropriate intervention to minimize their destructive consequences. The most traditional method for detecting forest fires is human based surveillance through lookout towers. However, this study presents a more modern technique. It utilizes land-based real-time multispectral video processing to identify and determine the possibility of fire occurring within the camera’s field of view. The temporal, spectral, and spatial signatures of the fire are exploited. The methods discussed include: (1) Range filtering followed by entropy filtering of the infrared (IR) video data, and (2) Principal Component Analysis of visible spectrum video data followed by motion analysis and adaptive intensity threshold. The two schemes presented are tailored to detect the fire core, and the smoke plume, respectively.
Cooled Midwave Infrared (IR) camera is used to capture the heat distribution within the field of view. The fire core is then isolated using texture analysis techniques: first, range filtering applied on two consecutive IR frames, and then followed by entropy filtering of their absolute difference.
Since smoke represents the earliest sign of fire, this study also explores multiple techniques for detecting smoke plumes in a given scene. The spatial and temporal variance of smoke plume is captured using temporal Principal Component Analysis, PCA. The results show that a smoke plume is readily segmented via PCA applied on the visible Blue band over 2 seconds sampled every 0.2 seconds. The smoke plume exists in the 2nd principal component, and is finally identified, segmented, and isolated, using either motion analysis or adaptive intensity threshold.
Experimental results, obtained in this study, show that the proposed system can detect smoke effectively at a distance of approximately 832 meters with a low false-alarm rate and short reaction time. Applied, such system would achieve early forest fire detection minimizing fire damage.
Keywords: Image Processing, Principal Component Analysis, PCA, Principal Component, PC, Texture Analysis, Motion Analysis, Multispectral, Visible, Cooled Midwave Infrared, Smoke Signature, Gaussian Mixture Model.
40
Chen, Cong. "Side Channel Leakage Exploitation, Mitigation and Detection of Emerging Cryptosystems." Digital WPI, 2018. https://digitalcommons.wpi.edu/etd-dissertations/472.
Full textAbstract:
With the emerging computing technologies and applications in the past decades, cryptography is facing tremendous challenges in its position of guarding our digital world.
The advent of quantum computers is potentially going to cease the dominance of RSA and other public key algorithms based on hard problems of factorization and discrete logarithm. In order to protect the Internet at post-quantum era, great efforts have been dedicated to the design of RSA substitutions. One of them is code- based McEliece public key schemes which are immune to quantum attacks.
Meanwhile, new infrastructures like Internet of Things are bringing the world enormous benefits but, due to the resource-constrained nature, require compact and still reliable cryptographic solutions. Motivated by this, many lightweight cryptographic algorithms are introduced.
Nevertheless, side channel attack is still a practical threat for implementations of these new algorithms if no countermeasures are employed. In the past decades two major categories of side channel countermeasures, namely masking and hiding, have been studied to mitigate the threat of such attacks. As a masking countermeasure, Threshold Implementation becomes popular in recent years. It is sound in providing provable side channel resistance for hardware-based cryptosystems but meanwhile it also incurs significant overheads which need further optimization for constrained applications. Masking, especially for higher order masking schemes, requires low signal-to-noise ratio to be effective which can be achieved by applying hiding countermeasures.
In order to evaluate side channel resistance of countermeasures, several tools have been introduced. Due to its simplicity, TVLA is being accepted by academy and industry as a one-size-fit-all leakage detection methodolgy that can be used by non-experts. However, its effectiveness can be negatively impacted by environmental factors such as temperature variations. Thus, a robust and simple evaluation method is desired.
In this dissertation, we first show how differential power analysis can efficiently exploit the power consumption of a McEliece implementation to recover the private key.
Then, we apply Threshold Implementation scheme in order to protect from the proposed attack. This is, to the best of our knowledge, the first time of applying Threshold Implementation in a public key cryptosystem.
Next, we investigate the reduction of shares in Threshold Implementation so as to bring down its overhead for constrained applications. Our study shows that Threshold Implementation using only two shares reduces the overheads while still provides reliable first-order resistance but in the meantime it also leaks a strong second-order leakage.
We also propose a hiding countermeasure, namely balanced encoding scheme based on the idea of Dual- Rail Pre-charge logic style in hardwares. We show that it is effective to mitigate the leakage and can be combined with masking schemes to achieve better resistance.
Finally, we study paired t-test versus Welch's t-test in the original TVLA and show its robustness against environmental noises. We also found that using moving average in computing t statistics can detect higher-order leakage faster.
41
Domingos, Ana Sofia Martins. "Determination of ortho- and retronasal detection and recognition thresholds for off-favours in wine." Master's thesis, ISA/UL, 2019. http://hdl.handle.net/10400.5/18370.
Full textAbstract:
Mestrado em Viticultura e Enologia - Instituto Superior de Agronomia - UL / Faculdade de Ciências - Universidade do Porto<br>The research performed in this thesis had as overall objective to fill the gap in the current literature about flavour thresholds and sensitivity to suprathreshold concentrations. Two groups of tasters were used, one comprised by 15 novices (student panel) and the other by 16 wine experts (professional panel). Detection (DT) and recognition (RT) thresholds were established in wine for six common off-flavour compounds when present in high concentration: acetaldehyde, acetic acid, ethyl acetate, hexanol, hydrogen sulfide and volatile phenols. Thresholds were evaluated orthonasally (ON) and retronasally (RN) by each participant, using the standardized procedures based on the ascending forced-choice (3-AFC) triangular tests. The suprathreshold intensity was obtained ON and RN after testing three measures of individual responsiveness: geometric mean (GM), area-under-curve (AUC) and slope of the response regression line.
DT and RT thresholds yielded overall results within the range reported in literature. Interestingly, in both threshold and suprathreshold tests, contrary to predictions based on reports of an association between expertise and improvement of the olfactory and gustatory sensitivity, the thresholds for the same molecules were similar between tasting panels, indicating that sensitivities were practically not affected by expertise. The relationship between threshold and suprathreshold intensities was also studied. In most cases there was not a relationship, implying that a low threshold does not necessarily lead to greater sensations elicited by suprathreshold concentrations. On the other hand, the results suggested that some subjects perceived the molecules differently on both orthonasal and retronasal pathways, presenting higher variability on the orthonasal evaluation comparing with the retronasal one.
Overall, results highlighted the high variability of individual olfactory responses and the importance of the retronasal pathway on the assessment of off-flavours in wines<br>N/A
42
Luu, Hoang Duc, Joseph Páez Chávez, Doan Thai Son, and Stefan Siegmund. "Finite-time Lyapunov exponents and metabolic control coefficients for threshold detection of stimulus–response curves." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-215920.
Full textAbstract:
In biochemical networks transient dynamics plays a fundamental role, since the activation of signalling pathways is determined by thresholds encountered during the transition from an initial state (e.g. an initial concentration of a certain protein) to a steady-state. These thresholds can be defined in terms of the inflection points of the stimulus-response curves associated to the activation processes in the biochemical network. In the present work, we present a rigorous discussion as to the suitability of finite-time Lyapunov exponents and metabolic control coefficients for the detection of inflection points of stimulus-response curves with sigmoidal shape.
43
Ngethe, Nixon Thuo. "An adaptive threshold energy detection technique with noise variance estimation for cognitive radio sensor networks." Master's thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/20103.
Full textAbstract:
The paradigm of wireless sensor networks (WSNs) has gained a lot of popularity in the recent years due to the proliferation of wireless devices. This is evident as WSNs find numerous application areas in fields such as agriculture, infrastructure monitoring, transport, and security surveillance. Traditionally, most deployments of WSNs operate in the unlicensed industrial scientific and medical (ISM) band and more specifically, the globally available 2.4 GHz frequency band. This band is shared with several other wireless technologies such as Bluetooth, Wi-Fi, near field communication and other proprietary technologies thus leading to overcrowding and interference problems. The concept of dynamic spectrum access alongside cognitive radio technology can mitigate the coexistence issues by allowing WSNs to dynamically access new spectrum opportunities. Furthermore, cognitive radio technology addresses some of the inherent constraints of WSNs thus introducing a myriad of benefits. This justifies the emergence of cognitive radio sensor networks (CRSNs). The selection of a spectrum sensing technique plays a vital role in the design and implementation of a CRSN. This dissertation sifts through the spectrum sensing techniques proposed in literature investigating their suitability for CRSN applications. We make amendments to the conventional energy detector particularly on the threshold selection technique. We propose an adaptive threshold energy detection model with noise variance estimation for implementation in CRSN systems. Experimental work on our adaptive threshold technique based on the recursive one-sided hypothesis test (ROHT) technique was carried out using MatLab. The results obtained indicate that our proposed technique is able to achieve adaptability of the threshold value based on the noise variance. We also employ the constant false alarm rate (CFAR) threshold to act as a defence mechanism against interference of the primary user at low signal to noise ratio (SNR). Our evaluations indicate that our adaptive threshold technique achieves double dynamicity of the threshold value based on the noise variance and the perceived SNR.
44
Nadkarni, Ketan Milind. "An Intrusion Detection Scheme for Wireless Mobile Ad hoc Networks based on DSDV Protocol." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/44514.
Full textAbstract:
Wireless mobile ad-hoc networks (MANETs) have come into prominence due to
potentially rapid and infrastructure-less deployment in military operations and also in
emergency and disaster-relief situations. However, the unreliability of wireless links
between nodes, possibility of mobile nodes being captured or compromised, break down
of cooperative algorithms, all lead to increased vulnerability. No matter how supposedly
secure a system is, unrelenting attackers eventually succeed in infiltrating it. This
underscores the need to monitor what is taking place in a system and look for suspicious
behavior. An Intrusion Detection System (IDS) does just that: monitors audit data, looks
for intrusions in the system, and initiates a proper response. Bandwidth constraints of
MANETs necessitate the need for efficiency of any security scheme in order to prevent
the overloading of the network.
In this thesis, we have proposed an effective and efficient IDS for MANETs that
aims to combine misuse detection with anomaly detection. Experimental validation has
provided significant results about not only the accuracy and robustness of the scheme but
also the non-degradability of network performance upon induction of our security
scheme. It is not affected by factors such as node density, node mobility, traffic load and
percentage of malicious nodes. On an average, our IDS, implemented using Destination-
Sequenced Distance-Vector (DSDV) protocol, detects intrusions with an accuracy of over
90% and is generally insensitive to false alarms. Moreover, performance metrics such as
end-to-end delay, packet delivery ratio and normalized routing load are only marginally
affected (about 2% decrease in performance).<br>Master of Science
45
Karmarkar, Kedar Madhav. "SCALABLE BUS ENCODING FOR ERROR-RESILIENT HIGH-SPEED ON-CHIP COMMUNICATION." OpenSIUC, 2013. https://opensiuc.lib.siu.edu/dissertations/720.
Full textAbstract:
Shrinking minimum feature size in deep sub-micron has made fabrication of progressively faster devices possible. The performance of interconnects has been a bottleneck in determining the overall performance of a chip. A reliable high-speed communication technique is necessary to improve the performance of on-chip communication. Recent publications have demonstrated that use of multiple threshold voltages improves the performance of a bus significantly. The multi-threshold capture mechanism takes advantage of predictable temporal behavior of a tightly coupled bus to predict the next state of the bus early. However, Use of multiple threshold voltages also reduces the voltage slack and consequently increases the susceptibility to noise. Reduction in supply voltage exacerbates the situation. This work proposes a novel error detection and correction encoding technique that takes advantage of the high performance of the multi-threshold capture mechanism as well as its inbuilt redundancy to achieve reliable high-speed communication while introducing considerably less amount of redundancy as compared to the conventional methods. The proposed technique utilizes graph-based algorithms to produce a set of valid code words. The algorithm takes advantage of implicit set operations using binary decision diagram to improve the scalability of the code word selection process. The code words of many crosstalk avoidance codes including the proposed error detection and correction technique exhibit a highly structured behavior. The sets of larger valid code words can be recursively formed using the sets of smaller valid code words. This work also presents a generalized framework for scalable on-chip code word generation. The proposed CODEC implementation strategy uses a structured graph to model the recursive nature of an encoding technique that facilitates scalable CODEC implementation. The non-enumerative nature of the implementation strategy makes it highly scalable. The modular nature of the CODEC also simplifies use of pipelined architecture thereby improving the throughput of the bus.
46
Larsson, Linda. "Olfactory sensitivity in CD-1 mice for the sperm-attractant odorant bourgeonal and some of its structural analogues." Thesis, Linköping University, Linköping University, Department of Physics, Chemistry and Biology, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-56813.
Full textAbstract:
<p>Using a conditioning paradigm and an automated olfactometer, I investigated the olfactory sensitivity of five CD-1 mice for seven aromatic aldehydes. With two of the stimuli (3-phenylpropanal and canthoxal), the animals discriminated concentrations as low as 10 ppb (parts per billion) from the odorless solvent and with four of the stimuli (helional, cyclamal, lilial and lyral) they discriminated concentrations as low as 1 ppb, with single individuals even scoring better. All five animals yielded the by far lowest threshold value with bourgeonal and discriminated a concentration of 0.1 ppq (parts per quadrillion) from the odorless solvent. The detection threshold values for aromatic aldehydes were found to be affected by the type of functional groups and oxygen moiety attached to the benzene ring. A comparison of the present data with those obtained in other species found no clear correlation between olfactory sensitivity and the size of the olfactory receptor repertoire.</p>
47
Rach, Stefan [Verfasser]. "On quantifying multisensory interaction effects in the vicinity of detection thresholds / Stefan Rach." Bremen : IRC-Library, Information Resource Center der Jacobs University Bremen, 2010. http://d-nb.info/1034988158/34.
Full text
48
Li, Peter H. "Gap-junctional coupling of mammalian rods and its effect on visual detection thresholds." Diss., Search in ProQuest Dissertations & Theses. UC Only, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3339214.
Full text
49
Chakraborty, Debaditya. "Detection of Faults in HVAC Systems using Tree-based Ensemble Models and Dynamic Thresholds." University of Cincinnati / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1543582336141076.
Full text
50
Hytla, Patrick C. "Multi-Ratio Fusion Change Detection Framework with Adaptive Statistical Thresholding." University of Dayton / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1461322397.
Full text