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Academic literature on the topic 'Passive scheme'

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Published: 1 June 2024

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Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Journal articles on the topic "Passive scheme":

1

Chithapuram, Chethan Upendra, Aswani Kumar Cherukuri, and Yogananda V. Jeppu. "Aerial vehicle guidance based on passive machine learning technique." International Journal of Intelligent Computing and Cybernetics 9, no. 3 (August 8, 2016): 255–73. http://dx.doi.org/10.1108/ijicc-12-2015-0042.

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Purpose The purpose of this paper is to develop a new guidance scheme for aerial vehicles based on artificial intelligence. The new guidance scheme must be able to intercept maneuvering targets with higher probability and precision compared to existing algorithms. Design/methodology/approach A simulation setup of the aerial vehicle guidance problem is developed. A model-based machine learning technique known as Q-learning is used to develop a new guidance scheme. Several simulation experiments are conducted to train the new guidance scheme. Orthogonal arrays are used to define the training experiments to achieve faster convergence. A well-known guidance scheme known as proportional navigation guidance (PNG) is used as a base model for training. The new guidance scheme is compared for performance against standard guidance schemes like PNG and augmented proportional navigation guidance schemes in presence of sensor noise and computational delays. Findings A new guidance scheme for aerial vehicles is developed using Q-learning technique. This new guidance scheme has better miss distances and probability of intercept compared to standard guidance schemes. Research limitations/implications The research uses simulation models to develop the new guidance scheme. The new guidance scheme is also evaluated in the simulation environment. The new guidance scheme performs better than standard existing guidance schemes. Practical implications The new guidance scheme can be used in various aerial guidance applications to reach a dynamically moving target in three-dimensional space. Originality/value The research paper proposes a completely new guidance scheme based on Q-learning whose performance is better than standard guidance schemes.
2

Xiaodong Liang and O. Ilochonwu. "Passive Harmonic Filter Design Scheme." IEEE Industry Applications Magazine 17, no. 5 (September 2011): 36–44. http://dx.doi.org/10.1109/mias.2010.939652.

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Zhou, Biao, Deockhyeon Ahn, Jungpyo Lee, Chao Sun, Sabbir Ahmed, and Youngok Kim. "A Passive Tracking System Based on Geometric Constraints in Adaptive Wireless Sensor Networks." Sensors 18, no. 10 (September 29, 2018): 3276. http://dx.doi.org/10.3390/s18103276.

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Target tracking technologies in wireless sensor network (WSNs) environments fall into two categories: active and passive schemes. Unlike with the active positioning schemes, in which the targets are required to hold cooperative devices, the research on passive tracking, i.e., tracking device-free targets, has recently showed promise. In the WSN, device-free targets can be tracked by sensing radio frequency tomography (RFT) on the line-of-sight links (LOSLs). In this paper, we propose a passive tracking scheme exploiting both adaptive-networking LOSL webs and geometric constraint methodology for tracking single targets, as well as multiple targets. Regarding fundamental knowledge, we firstly explore the spatial diversity technique for RFT detection in realistic situations. Then, we analyze the power consumption of the WSN and propose an adaptive networking scheme for the purpose of energy conservation. Instead of maintaining a fixed LOSL density, the proposed scheme can adaptively adjust the networking level to save energy while guaranteeing tracking accuracy. The effectiveness of the proposed scheme is evaluated with computer simulations. According to the results, it is observed that the proposed scheme can sufficiently reduce power consumption, while providing qualified tracking performance.
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Falugi, P. "Model predictive control: a passive scheme." IFAC Proceedings Volumes 47, no. 3 (2014): 1017–22. http://dx.doi.org/10.3182/20140824-6-za-1003.02165.

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Juraeva, Makhsuda, and Dong-Jin Kang. "Optimal Combination of Mixing Units Using the Design of Experiments Method." Micromachines 12, no. 8 (August 19, 2021): 985. http://dx.doi.org/10.3390/mi12080985.

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A passive micromixer was designed by combining two mixing units: the cross-channel split and recombined (CC-SAR) and a mixing cell with baffles (MC-B). The passive micromixer was comprised of eight mixing slots that corresponded to four combination units; two mixing slots were grouped as one combination unit. The combination of the two mixing units was based on four combination schemes: (A) first mixing unit, (B) first combination unit, (C) first combination module, and (D) second combination module. The statistical significance of the four combination schemes was analyzed using analysis of variance (ANOVA) in terms of the degree of mixing (DOM) and mixing energy cost (MEC). The DOM and MEC were simulated numerically for three Reynolds numbers (Re = 0.5, 2, and 50), representing three mixing regimes. The combination scheme (B), using different mixing units in the first two mixing slots, was significant for Re = 2 and 50. The four combination schemes had little effect on the mixing performance of a passive micromixer operating in the mixing regime of molecular dominance. The combination scheme (B) was generalized to arbitrary mixing slots, and its significance was analyzed for Re = 2 and 50. The general combination scheme meant two different mixing units in two consecutive mixing slots. The numerical simulation results showed that the general combination scheme was statistically significant in the first three combination units for Re = 2, and significant in the first two combination units for Re = 50. The combined micromixer based on the general combination scheme throughout the entire micromixer showed the best mixing performance over a wide range of Reynolds numbers, compared to other micromixers that did not adopt completely the general combination scheme. The most significant enhancement due to the general combination scheme was observed in the transition mixing scheme and was negligible in the molecular dominance scheme. The combination order was less significant after three combination units.
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Yang, Yan Gui, Zhi Xin Chen, Min Xun Lu, and Zhi Qiang Xu. "Analysis on Schemes of Passive Heave Compensation System for Base Plate." Advanced Materials Research 562-564 (August 2012): 851–54. http://dx.doi.org/10.4028/www.scientific.net/amr.562-564.851.

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Three kinds of schemes of passive heave compensation systems (PHCS) for base plate are presented in this paper. These schemes are PHCS based on winch, PHCS based on weight and PHCS based on hydraulic cylinder. An analysis focused on the principles and the characteristics of these schemes is developed, and the hydraulic systems of these schemes are also established. This provides an important theoretical guidance for choosing the scheme of the passive heave compensation system for base plate according to different conditions.
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Meng, Qing Li, Jun Chen, and Chun Yu Chu. "The Passive Control Seismic Strengthen about RC Frame Infilled Wall Structure." Applied Mechanics and Materials 405-408 (September 2013): 1056–62. http://dx.doi.org/10.4028/www.scientific.net/amm.405-408.1056.

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In this paper, a four-storey reinforced concrete frame infilled wall structure does not meet the seismic perform target, based on the seismic behavior target of both frame and infilled wall, to carry out the study on the passive control seismic strengthen of RC infilled wall structure with attached dampers. First, two kinds of passive control strengthen schemes were put forward. Scheme 1: Dampers were installed in the in-plane direction parallel with all 1-storey infilled walls; Scheme 2: Dampers were installed in the in-plane direction parallel with all 1-storey and 2-storey infilled walls. Then to establish the two types of passive control seismic strengthen model in OpenSees, carry out the rare earthquake nonlinear time-history analysis under El Centro, Parkfield and San Fenando ground motions. Finally, in accordance with the seismic performance target quantization index of RC Frame infilled wall structure used as hospital, i.e. considering storey drift ratio limit and infilled wall damage, judge the scheme 2 can meets the seismic performance target.
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Vasserman, I., and E. R. Moog. "A passive scheme for ID end correction." Review of Scientific Instruments 66, no. 2 (February 1995): 1943–45. http://dx.doi.org/10.1063/1.1146459.

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Kumar, Pankaj, Vishnu Sharma, Gaurav Sharma, and Tarunpreet Bhatia. "An Efficient and Secure Certificateless Aggregate Signature From Bilinear Maps." International Journal of Information Security and Privacy 13, no. 4 (October 2019): 89–108. http://dx.doi.org/10.4018/ijisp.2019100106.

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Certificateless signature schemes are a very intriguing aspect in information security because of its capability of removing the well-known key escrow problem predominately in ID-based cryptography. He et al. proposed an efficient certificateless aggregate signature scheme and proved that their scheme is secure against all possible types of security attacks. However, the authors still managed to find loopholes in the form of insecurities against ‘honest but curious' and ‘malicious but passive' attacks during cryptanalysis of He et al.'s scheme. The authors propose an efficient certificateless aggregate signature scheme which fills the security gaps in He et al.'s scheme and demonstrate the security in their scheme via a mathematical proof, and reinforce the fact that their scheme is much more efficient in a thorough performance comparison of their scheme against the previous schemes.
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Chun-Kit Chan, F. Tong, Lian-Kuan Chen, Jian Song, and D. Lam. "A practical passive surveillance scheme for optically amplified passive branched optical networks." IEEE Photonics Technology Letters 9, no. 4 (April 1997): 526–28. http://dx.doi.org/10.1109/68.559410.

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You might also be interested in the extended bibliographies on the topic 'Passive scheme' for particular source types:
Journal articles Dissertations / Theses Books

Dissertations / Theses on the topic "Passive scheme":

1

Smiley, W. J. "Collision detection scheme for unmanned aircraft using passive Panospheric§T§M Imaging sensor." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0002/MQ44858.pdf.

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Kubrak, Boris. "Direct numerical simulation of gas transfer at the air-water interface in a buoyant-convective flow environment." Thesis, Brunel University, 2014. http://bura.brunel.ac.uk/handle/2438/10196.

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The gas transfer process across the air-water interface in a buoyant-convective environment has been investigated by Direct Numerical Simulation (DNS) to gain improved understanding of the mechanisms that control the process. The process is controlled by a combination of molecular diffusion and turbulent transport by natural convection. The convection when a water surface is cooled is combination of the Rayleigh-B´enard convection and the Rayleigh-Taylor instability. It is therefore necessary to accurately resolve the flow field as well as the molecular diffusion and the turbulent transport which contribute to the total flux. One of the challenges from a numerical point of view is to handle the very different levels of diffusion when solving the convection-diffusion equation. The temperature diffusion in water is relatively high whereas the molecular diffusion for most environmentally important gases is very low. This low molecular diffusion leads to steep gradients in the gas concentration, especially near the interface. Resolving the steep gradients is the limiting factor for an accurate resolution of the gas concentration field. Therefore a detailed study has been carried out to find the limits of an accurate resolution of the transport for a low diffusivity scalar. This problem of diffusive scalar transport was studied in numerous 1D, 2D and 3D numerical simulations. A fifth-order weighted non-oscillatory scheme (WENO) was deployed to solve the convection of the scalars, in this case gas concentration and temperature. The WENO-scheme was modified and tested in 1D scalar transport to work on non-uniform meshes. To solve the 2D and 3D velocity field the incompressible Navier-Stokes equations were solved on a staggered mesh. The convective terms were solved using a fourth-order accurate kinetic energy conserving discretization while the diffusive terms were solved using a fourth-order central method. The diffusive terms were discretized using a fourth-order central finite difference method for the second derivative. For the time-integration of the velocity field a second-order Adams-Bashworth method was employed. The Boussinesq approximation was employed to model the buoyancy due to temperature differences in the water. A linear relationship between temperature and density was assumed. A mesh sensitivity study found that the velocity field is fully resolved on a relatively coarse mesh as the level of turbulence is relatively low. However a finer mesh for the gas concentration field is required to fully capture the steep gradients that occur because of its low diffusivity. A combined dual meshing approach was used where the velocity field was solved on a coarser mesh and the scalar field (gas concentration and temperature) was solved on an overlaying finer submesh. The velocities were interpolated by a second-order method onto the finer sub-mesh. A mesh sensitivity study identified a minimum mesh size required for an accurate solution of the scalar field for a range of Schmidt numbers from Sc = 20 to Sc = 500. Initially the Rayleigh-B´enard convection leads to very fine plumes of cold liquid of high gas concentration that penetrate the deeper regions. High concentration areas remain in fine tubes that are fed from the surface. The temperature however diffuses much stronger and faster over time and the results show that temperature alone is not a good identifier for detailed high concentration areas when the gas transfer is investigated experimentally. For large timescales the temperature field becomes much more homogeneous whereas the concentration field stays more heterogeneous. However, the temperature can be used to estimate the overall transfer velocity KL. If the temperature behaves like a passive scalar a relation between Schmidt or Prandtl number and KL is evident. A qualitative comparison of the numerical results from this work to existing experiments was also carried out. Laser Induced Fluorescence (LIF) images of the oxygen concentration field and Schlieren photography has been compared to the results from the 3D simulations, which were found to be in good agreement. A detailed quantitative analysis of the process was carried out. A study of the horizontally averaged convective and diffusive mass flux enabled the calculation of transfer velocity KL at the interface. With KL known the renewal rate r for the so called surface renewal model could be determined. It was found that the renewal rates are higher than in experiments in a grid stirred tank. The horizontally averaged mean and fluctuating concentration profiles were analysed and from that the boundary layer thickness could be accurately monitored over time. A lot of this new DNS data obtained in this research might be inaccessible in experiments and reveal previously unknown details of the gas transfer at the air water interface.
3

Mojsejenko, Dimitri. "ESTIMATING PASSIVE MATERIAL PROPERTIES AND FIBER ORIENTATION IN A MYOCARDIAL INFARCTION THROUGH AN OPTIMIZATION SCHEME USING MRI AND FE SIMULATION." UKnowledge, 2014. http://uknowledge.uky.edu/me_etds/41.

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Myocardial infarctions induce a maladaptive ventricular remodeling process that independently contributes to heart failure. In order to develop effective treatments, it is necessary to understand the way and extent to which the heart undergoes remodeling over the course of healing. There have been few studies to produce any data on the in-vivo material properties of infarcts, and much less on the properties over the time course of healing. In this paper, the in-vivo passive material properties of an infarcted porcine model were estimated through a combined use of magnetic resonance imaging, catheterization, finite element modeling, and a genetic algorithm optimization scheme. The collagen fiber orientation at the epicardial and endocardial surfaces of the infarct were included in the optimization. Data from porcine hearts (N=6) were taken at various time points after infarction, specifically 1 week, 4 weeks, and 8 weeks post-MI. The optimized results shared similarities with previous studies. In particular, the infarcted region was shown to dramatically increase in stiffness at 1 week post-MI. There was also evidence of a subsequent softening of the infarcted region at later time points post infarction. Fiber orientation results varied greatly but showed a shift toward a more circumferential orientation.
4

Mohamed, Jessica Rose. "The development of a kernel to detect Ziphius cavirostris vocalizations and a performance assessment of an automated passive acoustic detection scheme." Thesis, Monterey, Calif. : Naval Postgraduate School, 2008. http://edocs.nps.edu/npspubs/scholarly/theses/2008/Sept/08Sep%5FMohamed.pdf.

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Thesis (M.S. in Meterology and Physical Oceanography)--Naval Postgraduate School, September 2008.
Thesis Advisor(s): Chiu, Ching-Sang ; Miller, Christopher W. "September 2008." Description based on title screen as viewed on .November 4, 2008. Includes bibliographical references (p. 35-36). Also available in print.
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Akhavanfoomani, Aria. "Derivative-free stochastic optimization, online learning and fairness." Electronic Thesis or Diss., Institut polytechnique de Paris, 2023. http://www.theses.fr/2023IPPAG001.

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Dans cette thèse, nous étudions d'abord le problème de l'optimisation d'ordre zéro dans le cadre actif pour des fonctions lisses et trois classes différentes de fonctions : i) les fonctions qui satisfont la condition de Polyak-Łojasiewicz, ii) les fonctions fortement convexes, et iii) la classe plus large des fonctions non convexes fortement lisses.De plus, nous proposons un nouvel algorithme basé sur la randomisation de type l1, et nous étudions ses propriétés pour les fonctions convexes Lipschitz dans un cadre d'optimisation en ligne. Notre analyse est due à la dérivation d'une nouvelle inégalité de type Poincar'e pour la mesure uniforme sur la sphère l1 avec des constantes explicites.Ensuite, nous étudions le problème d'optimisation d'ordre zéro dans les schémas passifs. Nous proposons une nouvelle méthode pour estimer le minimiseur et la valeur minimale d'une fonction de régression lisse et fortement convexe f. Nous dérivons des limites supérieures pour cet algorithme et prouvons des limites inférieures minimax pour un tel cadre.Enfin, nous étudions le problème du bandit contextuel linéaire sous contraintes d'équité où un agent doit sélectionner un candidat dans un pool, et où chaque candidat appartient à un groupe sensible. Nous proposons une nouvelle notion d'équité qui est pratique dans l'exemple susmentionné. Nous concevons une politique avide qui calcule une estimation du rang relatif de chaque candidat en utilisant la fonction de distribution cumulative empirique, et nous prouvons sa propriété optimale
In this thesis, we first study the problem of zero-order optimization in the active setting for smooth and three different classes of functions: i) the functions that satisfy the Polyak-Łojasiewicz condition, ii) strongly convex functions, and iii) the larger class of highly smooth non-convex functions.Furthermore, we propose a novel algorithm that is based on l1-type randomization, and we study its properties for Lipschitz convex functions in an online optimization setting. Our analysis is due to deriving a new Poincar'e type inequality for the uniform measure on the l1-sphere with explicit constants.Then, we study the zero-order optimization problem in the passive schemes. We propose a new method for estimating the minimizer and the minimum value of a smooth and strongly convex regression function f. We derive upper bounds for this algorithm and prove minimax lower bounds for such a setting.In the end, we study the linear contextual bandit problem under fairness constraints where an agent has to select one candidate from a pool, and each candidate belongs to a sensitive group. We propose a novel notion of fairness which is practical in the aforementioned example. We design a greedy policy that computes an estimate of the relative rank of each candidate using the empirical cumulative distribution function, and we proved its optimal property
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Élise, Simon. "Développement d’indices écoacoustiques pour caractériser et suivre l’état et le fonctionnement des écosystèmes coralliens." Thesis, La Réunion, 2019. http://www.theses.fr/2019LARE0041.

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Les récifs coralliens sont l’écosystème marin le plus complexe, mais aussi le plus menacé par les perturbations croissantes liées aux activités anthropiques. Leur conservation représente un véritable défi. Alors que le maintien des récifs au plus proche de leurs configurations et dynamiques actuelles doit être privilégié, nous devons également nous préparer à une évolution rapide de leur fonctionnement et adapter réseaux et outils de suivis à cette nouvelle situation. Des avancées technologiques récentes ont permis l’émergence d’outils innovants qui pourraient permettre à court terme d’augmenter considérablement la résolution spatio-temporelle des suivis. Parmi eux, l’acoustique passive est en plein essor. L’objet de cette thèse a été d’affiner son cadre d’utilisation pour évaluer et suivre l’état écologique et le fonctionnement des écosystèmes coralliens. Des enregistrements des paysages sonores et des relevés écologiques (assemblages de poissons et habitat) ont été réalisés sur 31 récifs de pente externe autour de trois îles de l’Indo-pacifique avec des caractéristiques environnementales variables, incluant des pressions anthropiques contrastées. L’analyse des résultats obtenus avec différentes combinaisons de paramètres d’échantillonnage (bande de fréquences, moment du cycle journalier choisi pour réaliser l’enregistrement, durée des échantillons de son) a permis de sélectionner un protocole d’échantillonnage basé sur les deux types d’indices écoacoustiques les plus utilisés pour l’étude des récifs coralliens. Ce protocole permet la caractérisation rapide et fiable de l’état écologique des récifs. En se basant sur ces lignes directrices, la capacité de six indices écoacoustiques à évaluer des fonctions clé de l’écosystème corallien a ensuite été démontrée. En comparant les apports de l’acoustique passive et de données environnementales pouvant être collectées par télédétection, la plus-value de l’utilisation d’indices écoacoustiques pour prédire la structure des assemblages de poissons récifaux a été identifiée et quantifiée. Une application de l’approche écoacoustique au suivi continu d’un site isolé a mis en évidence le potentiel particulièrement important de l’acoustique passive comme outil d’appui à la gestion dans ce type de contexte. Face à l’ampleur et à la vitesse des changements climatiques annoncés, les méthodes de suivi employées aujourd’hui, basées sur la présence d’observateur in situ, seront vraisemblablement insuffisantes. Combinée à d’autres outils de suivi, l’acoustique passive pourrait contribuer à détecter rapidement les perturbations des écosystèmes, condition indispensable pour en comprendre les causes et mettre en œuvre des réponses rapides et adaptées
Coral reefs are the most complex of marine ecosystems, but also the most threatened by ecological disruption resulting directly or indirectly from human activities. Their conservation represents a huge challenge. While maintaining coral reefs as close as possible to their current configurations and dynamics is among the highest priorities, we must also prepare for rapid changes in their functioning and adapt monitoring tools and networks to this new situation. Recent technological advances enabled the emergence of innovative tools with the potential to drastically increase the spatio-temporal resolution of coral reef monitoring. Among these, Passive Acoustic Monitoring (PAM) is on the rise. The aim of this thesis was to improve and facilitate the use of PAM as a tool for the assessment and monitoring of coral reefs’ ecological states and functioning. Soundscape recordings and ecological surveys (reef fish assemblages and habitat) were performed at 31 outer reef slope sites around three Indo-Pacific islands with variable environmental characteristics, including contrasted anthropogenic pressures. Analysing the results obtained with multiple combinations of sampling settings (frequency bandwidth, time of sampling (day/night), and sample duration) allowed the selection of a sampling scheme based on the two types of indices mostly used in coral reef studies. This scheme enables a rapid and reliable categorisation of reef’s ecological states. Based on these sampling guidelines, the capacity of six ecoacoustic indices to evaluate coral reef key functions was demonstrated. By comparing the contributions of PAM and coarse environmental data that could be sampled remotely, the added value of using ecoacoustic indices to predict reef fish assemblage structure was identified and quantified. An application of ecoacoustics to the continuous monitoring of a remote site highlighted the strong potential of PAM as a supporting tool for managers in such context. In view of the amplitude and velocity of expected climatic changes, current observer-based monitoring methods are likely to be exceeded. Combined to other monitoring tools, PAM could contribute to promptly detect ecosystem disturbances, which is essential to understand their causes and put in place rapid and adapted responses
7

Bousset, Marc. "Orientation d'un schema par passage d'un flot dans les angles." Paris, EHESS, 1993. http://www.theses.fr/1993EHES0028.

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L'orientation bipolaire d'un graphe biconnexe est une orientation acyclique de ses aretes qui n'admet qu'une seule source et un seul puits. Nous etudions deux algorithmes d'orientation bipolaire d'un graphe plan biconnexe, avec prise en compte dans ces algorithmes de contraintes de laterialite. Notre approche de l'orientation bipolaire d'un graphe plan repose sur la theorie du marquage en deux couleurs des angles introduite par p. Rosenstiehl. Nous proposons une nouvelle propriete geometrique des angles d'un graphe plan et une methode graphique pour la torsion d'une partie de la figure par le moyen d'une courbe fremee du plan traversant les angles de couleurs alternees. Les invariants locaux sur les couleurs permettent la recherche d'une orientation bipolaire par la programmation lineaire. Nous mettons en oeuvre un algorithme de flots en 0(n sqrt(n)) a travers les angles, generant une orientation bipolaire sous contraintes si elle existe et, dans le cas contraire, permettant de determiner les incompatibilites et de modifier dynamiquement le graphe pour les resoudre. Il s'ensuit une solution topologique au probleme de la representation graphique de certains circuits electriques. Les algorithme de faible complexite mis en oeuvre autorisent le traitement de grands reseaux industriels dans des temps negligeables par rapport au temps d'affichage a l'ecran
The bipolar orientation of a 2-connected graph is an acyclic orientation of its edges, with only one source and only one sink. We studytwo algorithms for the bipolar orientation of a plane 2-connected graph, which take laterality constraints into account. Our approach of the bipolar orientation of a plane graph is based on the theory of the 2-colour marking of the angles introduced by p. Rosenstiehl. We give a new geometric property of the angles of a plane graph and a graphic method for twisting a part of a diagram by means of a closed curve of the plane traversing angles coloured alternately. The local invariants on the colours allow us to compute a bipolar orientation by linear programming. We use an 0(n sqrt(n)) flow algorithm through the angles, which generates a bipolar orientation under contraints if one exists and, otherwise, enables us to determine incompatibilities and to dynamically modify the graph to solve them. There follows a topological solution to the problem of the graphic representation of some electrical circuits. The low-comolexity algorithms allow the processing of large industrial networks within short times
8

Liette, Jared V. "New paradigms to control coupled powertrain and frame motions using concurrent passive and active mounting schemes." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1401134376.

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Dourado, Diego Marques. "Estratégias para aumento da eficiência espectral e energética em redes TWDM-PON." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/18/18155/tde-11092017-113611/.

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O problema estudado relaciona-se ao planejamento de redes ópticas de acesso TWDM (Time and Wavelength Division Multiplexing), tendo como meta prover meios para atender ao consumo crescente de banda e, ao mesmo tempo, associar o mesmo ao menor consumo de energia possível e disponibilizar serviços de qualidade aos usuários da rede. Neste contexto, após a apresentação de uma revisão bibliográfica, alguns trabalhos foram selecionados como referências base para o estudo. Neste, foram analisadas técnicas de gerenciamento do comprimento de onda numa possível migração tecnológica dos equipamentos de acesso à rede pelo lado do usuário, as unidades de rede óptica (ONUs), considerando ser possível aproveitar de forma eficiente a distribuição de ONUs em cada par de comprimentos de onda, e como resultado, desligar interfaces de gerenciamento para economia de energia. Em paralelo a este objetivo, foram agregados métodos de \"registro adaptativo\" para melhorar o desempenho das ONUs que estão migrando e/ou entrando na rede, evitando colisões entre seus sinais e aumentando as chances de registro no terminal de linha óptico (OLT). Além do mais, o trabalho aborda o cumprimento do contrato de serviços (SLA) por parte das operadoras de telecomunicações, bem como oferece meios de estruturar uma rede óptica passiva (PON) para oferecer serviços com garantia de métricas de qualidade (QoS). Diferentes cenários foram tratados ao variar a porcentagem de usuários ativos na rede, e percebeu-se que, quando a PON opera com baixo índice de atividade (média 10% de ONUs ativas), foi possível economizar mais de 80% de energia em interfaces de gerenciamento. Por outro lado, ao envolver cenários mais realistas em redes ópticas (média de 50% de ONUs ativas), o TWDM-PON economizou quase 50% de energia nestas interfaces ao ser configurado com baixo período de migração (5 minutos). Além disso, alcançou um SLA de aproximadamente 100%, um valor considerado acima do usual quando se trata de cumprimento de serviços. Como uma tecnologia emergente, o TWDM-PON destaca-se num cenário que deve ser planejado para ser compatível com tecnologias implantadas, e além de disso, superar o legado de redes PON na economia de energia e qualidade de serviços oferecidos.
The problem studied is related to the planning of optical access networks TWDM (Time and Wavelength Division Multiplexing), aiming to provide means to meet the increasing bandwidth consumption and, at the same time, associating it to the lowest possible power consumption and providing quality services to the network users. In this context, following the presentation of a literature review, some studies were selected as a reference basis for the study. In this, some wavelength management techniques were analyzed aiming a possible technological migration of the network access equipment at the user side, the optical network units (ONU), whereas it is possible to use efficiently the ONUs distribution in each pair of wavelength. As a result, it becomes possible to switch off some management interfaces thus assuring a degree of power consumption save. In parallel, methods for providing an \"adaptive record\" of ONUs have been aggregated to improve the performance of those ONUs that are migrating and/or entering the network, avoiding collisions between their signals and increasing the chance of their registration in the optical line terminal (OLT). Furthermore, this work deals with the fulfillment of the service agreement (SLA) signed by telecommunications operators and proposes ways to design a passive optical network (PON) in order to offer services with quality metrics assurance (QoS). Different scenarios were treated to vary the percentage of active users on the network, and it was noticed that when the PON operates with low rate of activity (average 10% of active ONUs), it was possible to save over 80% energy in the management interfaces. Moreover, by involving more realistic scenarios in optical networks (50%, in average, of active ONUs), the TWDM-PON saved almost 50% of energy at the interfaces to be configured with low migration period (5 minutes). Additionally, it reached an SLA of approximately 100%, a value considered above the usual when it comes to compliance services. As an emerging technology, TWDM-PON stands out in a scenario that should be designed to be compatible with deployed technologies, and beyond that, to overcome the legacy of PON networks in energy saving and quality of services offered.
10

Ngo, Long. "Computationally sound automated proofs of cryptographic schemes." Thesis, Queensland University of Technology, 2012. https://eprints.qut.edu.au/54668/1/Long_Ngo__Thesis.pdf.

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Proving security of cryptographic schemes, which normally are short algorithms, has been known to be time-consuming and easy to get wrong. Using computers to analyse their security can help to solve the problem. This thesis focuses on methods of using computers to verify security of such schemes in cryptographic models. The contributions of this thesis to automated security proofs of cryptographic schemes can be divided into two groups: indirect and direct techniques. Regarding indirect ones, we propose a technique to verify the security of public-key-based key exchange protocols. Security of such protocols has been able to be proved automatically using an existing tool, but in a noncryptographic model. We show that under some conditions, security in that non-cryptographic model implies security in a common cryptographic one, the Bellare-Rogaway model [11]. The implication enables one to use that existing tool, which was designed to work with a different type of model, in order to achieve security proofs of public-key-based key exchange protocols in a cryptographic model. For direct techniques, we have two contributions. The first is a tool to verify Diffie-Hellmanbased key exchange protocols. In that work, we design a simple programming language for specifying Diffie-Hellman-based key exchange algorithms. The language has a semantics based on a cryptographic model, the Bellare-Rogaway model [11]. From the semantics, we build a Hoare-style logic which allows us to reason about the security of a key exchange algorithm, specified as a pair of initiator and responder programs. The other contribution to the direct technique line is on automated proofs for computational indistinguishability. Unlike the two other contributions, this one does not treat a fixed class of protocols. We construct a generic formalism which allows one to model the security problem of a variety of classes of cryptographic schemes as the indistinguishability between two pieces of information. We also design and implement an algorithm for solving indistinguishability problems. Compared to the two other works, this one covers significantly more types of schemes, but consequently, it can verify only weaker forms of security.
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Books on the topic "Passive scheme":

1

United States. National Aeronautics and Space Administration., ed. Multi-partitioning for ADI-schemes on message passing architectures. San Jose, CA: MCAT Institute, 1994.

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United States. National Aeronautics and Space Administration., ed. Multi-partitioning for ADI-schemes on message passing architectures. San Jose, CA: MCAT Institute, 1994.

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United States. National Aeronautics and Space Administration., ed. Multi-partitioning for ADI-schemes on message passing architectures. San Jose, CA: MCAT Institute, 1994.

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Schröder, Klaus Albrecht. Egon Schiele: Eros und Passion. München: Prestel, 2004.

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Schröder, Klaus Albrecht. Egon Schiele: Eros and passion. Munich: Prestel, 2006.

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Schröder, Klaus Albrecht. Egon Schiele: Eros and passion. Munich: Prestel, 1999.

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Schröder, Klaus Albrecht. Egon Schiele: Eros and passion. Munich: Prestel, 2006.

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Schröder, Klaus Albrecht. Egon Schiele. Eros und Passion. Prestel, 1995.

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National Aeronautics and Space Administration (NASA) Staff. Multi-Partitioning for Adi-Schemes on Message Passing Architectures. Independently Published, 2018.

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Qureshi, Zeshan. Unofficial Guide to Passing OSCEs: Candidate Briefings, Patient Briefings and Mark Schemes. Qureshi, Zeshan, 2013.

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Book chapters on the topic "Passive scheme":

1

Bao, Feng. "Analysis of a Conference Scheme Under Active and Passive Attacks." In Information Security and Privacy, 157–63. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-27800-9_14.

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Bai, Le-Yuan, Kai Gu, Bin Zeng, and Gang Yin. "Optimization Scheme of Turbine Frequency Regulation for Passive Nuclear Power Plant." In Lecture Notes in Electrical Engineering, 104–13. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-3113-8_12.

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Wang, Huan, Hongxia Wang, and Canghong Shi. "An Efficient Passive Authentication Scheme for Copy-Move Forgery Based on DCT." In Cloud Computing and Security, 417–29. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-48674-1_37.

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Panken, Frans J. M. "A TDMA Based Access Control Scheme for an ATM Passive Optical Tree Network." In Broadband Communications, 323–32. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-0-387-34987-9_27.

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Raval, Sejal, Himanshukumar R. Patel, Sagar Patel, and Vipul A. Shah. "Passive Fault-Tolerant Control Scheme for Nonlinear Level Control System with Parameter Uncertainty and Actuator Fault." In Applications of Fuzzy Techniques, 229–42. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-16038-7_23.

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Ge, Shuping, and Zhuo Zhang. "Conceptual scheme construction of active and passive re-creation adjustable frequency technology for urban acoustic environment based on TRIZ functional modeling." In Advances in Urban Engineering and Management Science Volume 2, 155–61. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003345329-21.

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Ahn, Kyung-hwan, Su-il Choi, Jae-doo Huh, and Ki-jun Han. "A Key Management Scheme Integrating Public Key Algorithms and GATE Operation of Multi-point Control Protocol (MPCP) for Ethernet Passive Optical Network (EPON) Security." In Information Networking, 783–92. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-540-45235-5_77.

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Berthome, Pascal, and Afonso Ferreira. "On broadcasting schemes in restricted optical passive star systems." In DIMACS Series in Discrete Mathematics and Theoretical Computer Science, 19–29. Providence, Rhode Island: American Mathematical Society, 1995. http://dx.doi.org/10.1090/dimacs/021/03.

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Dijkslag, Marco, Marc Damie, Florian Hahn, and Andreas Peter. "Passive Query-Recovery Attack Against Secure Conjunctive Keyword Search Schemes." In Applied Cryptography and Network Security, 126–46. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-09234-3_7.

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Panda, Dhabaleswar K., Sanjay Singal, and Pradeep Prabhakaran. "Multidestination message passing mechanism conforming to base wormhole routing scheme." In Parallel Computer Routing and Communication, 131–45. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/3-540-58429-3_33.

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Conference papers on the topic "Passive scheme":

1

Tao, Shiquan, Bo Wang, and Dayong Wang. "TWOR scheme for holographic wavelength filters." In Passive Components and Fiber-based Devices III. SPIE, 2006. http://dx.doi.org/10.1117/12.689336.

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Van Pelt, Tobin H., and Dennis S. Bernstein. "H2 Optimal Tuning of Passive Isolators and Absorbers." In ASME 1995 Design Engineering Technical Conferences collocated with the ASME 1995 15th International Computers in Engineering Conference and the ASME 1995 9th Annual Engineering Database Symposium. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/detc1995-0557.

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Abstract Isolators and absorbers have been studied extensively as a means of passively suppressing vibration in mechanical systems. This paper derives the optimal tuning parameters for these passive suppression schemes with an H2 performance criterion. The H2 norm of a system is briefly reviewed, and its selection as a performance criterion is motivated. The optimal tuning scheme in the case of the absorber is then compared to the classical work of Den Hartog [1] and Snowdon [2]. The comparison shows little improvement in the H2 cost over the classical scheme, which suggests that the approximately optimal H∞ analysis of the absorber respects the optimal H2 cost. However, the reverse is generally not true, as in the case with increasing absorber masses.
3

Musa, Faisal A., and Anthony Chan Carusone. "A Passive Filter Aided Timing Recovery Scheme." In 2008 IEEE International Symposium on Circuits and Systems - ISCAS 2008. IEEE, 2008. http://dx.doi.org/10.1109/iscas.2008.4542105.

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Venkateswara Reddy, M., Sourav De, and Ranjana Sodhi. "A Data-Driven Passive Islanding Detection Scheme." In 2022 IEEE 10th Power India International Conference (PIICON). IEEE, 2022. http://dx.doi.org/10.1109/piicon56320.2022.10045174.

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Jayasinghe, Thisara, Chang Joon Chae, and Rodney S. Tucker. "Bandwidth-Efficient Protection Scheme for Passive Optical Networks." In COIN-NGNCON 2006 - The Joint International Conference on Optical Internet and Next Generation Network. IEEE, 2006. http://dx.doi.org/10.1109/coinngncon.2006.4454490.

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McCauley, Gregory, Donald Durston, Philip Marcus, and Omer Savas. "Computational Analysis of a Passive Wake Alleviation Scheme." In 24th AIAA Applied Aerodynamics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2006. http://dx.doi.org/10.2514/6.2006-2820.

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Liang, Shan, Yunjian Tang, and Qin Zhu. "Passive Wake-up Scheme for Wireless Sensor Networks." In Second International Conference on Innovative Computing, Informatio and Control (ICICIC 2007). IEEE, 2007. http://dx.doi.org/10.1109/icicic.2007.443.

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Chan, Y. T., and Terry Rea. "Passive tracking scheme for a single stationary observer." In Aerospace/Defense Sensing, Simulation, and Controls, edited by Ivan Kadar. SPIE, 2001. http://dx.doi.org/10.1117/12.436975.

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Elmasry, Aly, and Matthias Liermann. "Passive Pneumatic Teleoperation System." In ASME/BATH 2013 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/fpmc2013-4464.

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This paper describes the modeling and control of a pneumatic tele-operation scheme, where the connection of master and slave cylinder is realized signal based but also physically via long transmission lines. The system is called passive because of the passive physical connection, which can also serve as a safety fallback solution. The advantage of this scheme is that a limited force feedback is realized with a minimum of extra effort in comparison to a teleportation system without force feedback. The stiffness of the physical connection is enhanced through a cascaded position and pressure control scheme with two proportional valves as actuators for each pneumatic line. The paper presents the mathematical model of the setup, which is used to determine the relative stability of the dynamic system as a function of control parameters. An experimental setup is presented which was set up to validate the system model. For a distance of 5 m between master and slave cylinder a stiffness of 2.4 N/mm could be established.
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Yu, Fei, Yueming Fu, Feng Zhu, and Mingqian Zhang. "Feasibility Study of Passive Water-Cooled Residual Heat Removal Scheme for Small Reactors." In 2022 29th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/icone29-92779.

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Abstract With the development of nuclear energy and the need for environmental protection, some advanced small reactors have gradually entered the public’s field of vision. The passive natural circulation is an important part of the inherent safety feature for advanced small reactors. Based on the limitations of the site environment, the large heat exchange area of the air cooler, and the high cost of equipment construction for the air-cooled waste heat removal scheme of a small reactor, this paper studies the water-cooled passive residual heat removal scheme and analyzes the water-cooled water cooling by establishing a system natural circulation hydraulic calculation model. From the aspects of equipment scale, construction cost, and operation & maintenance cost, etc., the advantages and disadvantages of several schemes were analyzed. This study shows that the water-cooled passive waste heat removal scheme can extract the core heat under accident conditions; it can reduce the equipment volume, and reduce the cost. Finally, suggestions are put forward for the follow-up improvement direction, and further research and realization of steam-water two-phase condensation heat transfer are made to improve heat exchange efficiency, reduce equipment scale, and improve the economy, which can provide a reference for the follow-up small reactor research and development.

Reports on the topic "Passive scheme":

1

Schwartz, Frank. Semi-Passive Chemical Oxidation Schemes for the Long-Term Treatment of Contaminants. Office of Scientific and Technical Information (OSTI), June 2005. http://dx.doi.org/10.2172/885059.

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Schwartz, Frank. Semi-Passive Chemical Oxidation Schemes for the Long-Term Treatment of Contaminants. Office of Scientific and Technical Information (OSTI), June 2005. http://dx.doi.org/10.2172/885181.

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Schwartz, Frank. Semi-Passive Chemical Oxidation Schemes for the Long-Term Treatment of Contaminants. Office of Scientific and Technical Information (OSTI), December 2004. http://dx.doi.org/10.2172/885352.

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Schwartz, Frank. Semi-Passive Chemical Oxidation Schemes for the Long-Term Treatment of Contaminants. Office of Scientific and Technical Information (OSTI), June 2003. http://dx.doi.org/10.2172/835411.

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Schwartz, Frank W., Eung Seok Lee, and Motomu Ibaraki. Semi-passive, chemical oxidation schemes for the long-term treatment of contaminants. Office of Scientific and Technical Information (OSTI), June 2003. http://dx.doi.org/10.2172/835412.

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Frank W. Schwartz. Semi-passive, Chemical Oxidation Schemes for the Long-term Treatment of Contaminants. Office of Scientific and Technical Information (OSTI), December 2005. http://dx.doi.org/10.2172/861451.

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Pearce. L51969 Development and Construction of a 24 inch and 36 inch Mk3 Elastic Wave In-Line Inspection Vehicle. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), November 2002. http://dx.doi.org/10.55274/r0011295.

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The Elastic Wave (EW) technology has a proven record of detecting longitudinal cracking in gas and liquid pipelines. Prior to the initiation of this project, the technology had been based on a 36" pipe diameter with conversion kits covering 30", 32" and 34". Bend passing capability was 3D back to back, changing to 5D on the 30" build. To extend the technology over a greater range of pipe diameters and to incorporate 1.5D bend-passing capability on the smaller sizes required a radical re-design of the whole system. The brief of this project was to design a system capable of operating over the size range from 20" to 48", to produce a mechanical arrangement that enabled 1.5D bend passing on the 24" to 30", and to provide built-in gas by-pass capability for all sizes from 24"to 48". The project has been completed. Designs have been schemed for 20"to 48". A 24" 1.5D tool and a 36" 3D tool have been designed, manufactured and tested. The mechanical integrity and defect detection capabilities of both vehicles have been proven. Seven commercial inspection operations were successfully completed in 2000, collecting a total 572.8km (355.9 miles) of EW data.

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