Gotowe bibliografie tematyczne / Imperfect Power Control

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Gotowa bibliografia na temat „Imperfect Power Control”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Imperfect Power Control"

Cameron, R., i B. Woerner. "Performance analysis of CDMA with imperfect power control". IEEE Transactions on Communications 44, nr 7 (lipiec 1996): 777–81. http://dx.doi.org/10.1109/26.508295.

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Agrawal, A., J. G. Andrews, J. M. Cioffi i Teresa Meng. "Iterative power control for imperfect successive interference cancellation". IEEE Transactions on Wireless Communications 4, nr 3 (maj 2005): 878–84. http://dx.doi.org/10.1109/twc.2005.846996.

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El-Dolil, Sami A. "Performance Analysis of CDMA WLL Systems with Imperfect Power Control and Imperfect Sectorization". International Journal of Vehicular Technology 2008 (30.09.2008): 1–8. http://dx.doi.org/10.1155/2008/413821.

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Wireless local loop (WLL) provides reliable, flexible, and economical access to the local telephone service using radio technology in the place of traditional wireline. In this paper, an analytical model is derived to evaluate the effect of both imperfect power control and imperfect sectorization on the performance of code division multiple access (CDMA) WLL systems. The results show that the capacity degradation, due to imperfect power control, is about 25.8% and 11.5% for single cell and multiple cell systems, respectively. Increasing the overlapping angle from to causes the capacity gain to decrease from 6 to 5.53, while the corresponding sectorization efficiency drops from 100% to 92.3%.

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Lee, J., R. Tafazolli i B. G. Evans. "Erlang capacity of OC-CDMA with imperfect power control". Electronics Letters 33, nr 4 (1997): 259. http://dx.doi.org/10.1049/el:19970173.

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Gatsis, Nikolaos, i Georgios B. Giannakis. "Power Control With Imperfect Exchanges and Applications to Spectrum Sharing". IEEE Transactions on Signal Processing 59, nr 7 (lipiec 2011): 3410–23. http://dx.doi.org/10.1109/tsp.2011.2143709.

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Park, Min Kyu, Seong Keun Oh i Chaewoo Lee. "Power allocation and call admission control in multi-class traffic DS-CDMA systems with imperfect power control". Wireless Communications and Mobile Computing 7, nr 6 (2007): 741–54. http://dx.doi.org/10.1002/wcm.405.

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Tao Shu i Zhisheng Niu. "Uplink capacity optimization by power allocation for multimedia cdma networks with imperfect power control". IEEE Journal on Selected Areas in Communications 21, nr 10 (grudzień 2003): 1585–94. http://dx.doi.org/10.1109/jsac.2003.815016.

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Corazza, G. E., G. De Maio i F. Vatalaro. "CDMA cellular systems performance with fading, shadowing, and imperfect power control". IEEE Transactions on Vehicular Technology 47, nr 2 (maj 1998): 450–59. http://dx.doi.org/10.1109/25.669083.

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Choe, S., H. M. Kwon i M. Uysal. "Performance analysis of imperfect closed-loop power control over Rayleigh fading". Electronics Letters 41, nr 19 (2005): 1071. http://dx.doi.org/10.1049/el:20052533.

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Boubaker, N., i K. B. Letaief. "Performance Analysis of DS-UWB Multiple Access Under Imperfect Power Control". IEEE Transactions on Communications 52, nr 9 (wrzesień 2004): 1459–63. http://dx.doi.org/10.1109/tcomm.2004.833204.

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Rozprawy doktorskie na temat "Imperfect Power Control"

Kou, Chin Fong. "Packet CDMA performance with imperfect power control". Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=22658.

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This work considers both single-cell and multi-cell packet CDMA cellular systems in the presence of power level variations due to imperfect power control. The teletraffic is modeled as an M/G/$ infty$ queueing system. Average error rates and outage probabilities are evaluated for single-cell and multi-cell CDMA systems. Traffic capacities in terms of a fixed average error rate or outage probability are presented. Often in the literature the analysis of multi-cell systems assumes a regular cell geometry with precisely defined boundaries. This condition is rarely met in practice. We have derived an analysis technique that does not assume a precise cell geometry, where the portable unit is connected to the base station from which it receives the highest power. In our opinion this represents a situation that is closer to reality than geographically specified cells. Both CDMA systems with two-dimensional and three-dimensional cell layouts have been considered. Numerical results for CDMA systems with different processing gains and coding gains are presented. It is shown that imperfect power control reduces significantly the CDMA traffic capacity.

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Le, Treust Maël. "Théorie de l’information, jeux répétés avec observation imparfaite et réseaux de communication décentralisés". Thesis, Paris 11, 2011. http://www.theses.fr/2011PA112269/document.

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Cette thèse est consacrée à l’étude des interactions entre la théorie des jeux et la théorie de l’information, ainsi qu’à leurs applications aux réseaux de communication décentralisés. D’une part, la théorie des jeux apporte des réponses aux problèmes d’optimisation dans lesquels des agents interagissent. Dans un jeu, les joueurs choisissent des actions et obtiennent des gains appelés utilités. Les hypothèses sur l’information que possèdent les joueurs avant de jouer sont fondamentales pour déterminer l’issue d’un jeu, aussi appelée équilibre. Lorsque le même jeu est répété d’étape en étape et que les joueurs n’observent pas les actions passées parfaitement,alors les utilités d’équilibre ne sont pas connues. D’autre part, la théorie de l’information étudie les performances d’un système communicant. De nos jours, les réseaux de communication sont tellement denses qu’ils ne peuvent plus s’organiser autour d’un unique opérateur central. La théorie des jeux est appropriée pour étudier de nouvelles organisations du traitement de l’information dans lesquelles les décisions sont prises localement. Dans un premier temps, au chapitre3, nous étudions le jeu du contrôle de puissance efficace du point de vue énergétique, grâce aux résultats existants pour les jeux répétés. Les émetteurs sont considérés comme des joueurs et choisissent la puissance d’émission du signal, considérée comme leur action. L’objectif d’un joueur est de choisir une puissance optimale pour la qualité de sa propre communication. Même si les joueurs n’observent pas les actions passées de manière parfaite, nous montrons que l’observation du "ratio signal sur interférence plus bruit" est suffisante pour garantir des résultats d’équilibre optimaux pour le réseau de communication. Dans un second temps, nous utilisons les outils de la théorie de l’information pour approfondir l’étude de la circulation de l’information parmi les joueurs. Dans le chapitre 4, un encodeur envoie un signal supplémentaire aux joueurs afin qu’ils observent parfaitement les actions jouées à l’étape précédente. L’observation des joueurs devient suffisamment précise pour nous permettre de retrouver l’ensemble des utilités d’équilibre du jeu répété. Ces résultats sont à leur tour exploités afin de modéliser des réseaux de communication plus réalistes et d’y apporter des solutions nouvelles. Dans le chapitre5, nous approfondissons l’étude des utilités d’équilibre lorsque les joueurs observent les actions passées à travers un canal d’observation arbitraire. Nous démontrons un résultat d’atteignabilité pour un canal multi-utilisateurs avec états qui comporte un encodeur, deux récepteurs légitimes et un espion. Ce résultat nous permet d’étudier les corrélations entre les suites d’actions qu’un groupe de joueurs peut mettre en oeuvre à l’insu d’un joueur opposant. L’étude des canaux multiutilisateurs est un pas en avant vers la caractérisation des utilités d’équilibre dans un jeu répété avec observation imparfaite
This thesis is devoted to the study of mutual contributions between games theory and informationtheory and their applications to decentralized communication networks. First, game theoryprovides answers to optimization problems in which agents interact. In a game, players chooseactions and obtains gains called utilities. Assumptions about the information possessed by playersbefore play is fundamental to determine the outcome a game, also called equilibrium. When thesame game is repeated from stage to stage and the players do not observe the past actions perfectly,then the equilibrium utilities are not known. On the other hand, information theory studiesthe performance of a communicating system. Nowadays, communication networks are so densethat they can not organize around a single central operator. Game theory is appropriate to explorenew organizations of communication networks in which decisions are taken locally. At first,in Chapter 3, we study the game of power control in terms of energy efficiency, thanks to theexisting results for repeated games. Transmitters are regarded as players and choose the transmissionpower of the signal, considered as their action. The objective of a player is to choose anoptimal power for the quality of its own communication. The players do not observe the pastactions perfectly, but we show that the observation of the "signal over interference plus noiseratio" is sufficient to ensure optimal equilibrium results for the communication network. In a secondstep, we use the tools of the information theory for further study of the flow of informationamong the players. In Chapter 4, an encoder sends an extra signal to the players so that theyperfectly observe the actions chosen in the previous stage-game. The observation of players issufficiently precise to characterize the set of equilibrium utilities of the repeated game. Theseresults are, in turn, used to model new communication networks and to provide more realisticsolutions. In Chapter 5, we deepen the study of equilibrium utilities when players observe thepast actions to through an arbitrary observation channel. We show a rate region is achievablefor the multi-user channel with states which includes an encoder, two legitimate receivers andan eavesdropper. This result allows us to study the correlations over the sequences of actions agroup of players can implement while keeping it secret from an opponent player. The study ofmulti-user channels is a step towards the characterization of equilibrium utilities in a repeatedgame with imperfect monitoring

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Lin, Lin, i 林林. "Power Control Errors with Imperfect Channel in Cellular CDMA Systems". Thesis, 1999. http://ndltd.ncl.edu.tw/handle/27874421369121348412.

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碩士
逢甲大學
電機工程學系
87
Recently , CDMA(Code Division Multiple Access) System uses PCS(Power Control Scheme) including CLPC(Close Loop Power Control) and OLPC(Open Loop Power Control), so that it can perfectly compensate Path Loss, partially overcome Shadowing and Multi-Path Effect. The received signal become to P.C.E. (Power Control Error) signal which power is LogNormal Distribution Style with =1dB~4dB. In this thesis, the received signal will combine the other PCS including Antenna Diversity、Sectorization、Voice Activity Monitoring to improve System Capacity and we will also consider Non-Uniform User Distribution. Due to those factors on this model, we expect to establish a realistic model and to use & (Outage Probability) to evaluate the effect of System Capacity. According to the result of this thesis, we can get the conclusion as bellow: (I.)Under Uniform User Distribution 1. Voice Activity Monitoring and Overlap Angle will do a few effect of System Capacity. 2. System Capacity will get the direct proportion gain under using the Skills of Antenna Diversity, but Sectorization does not. 3. The quantity of Multi-Path and the amount of P.C.E. will do a lot effect of System Capacity. (II.)Under Non-Uniform User Distribution 1. Non-Uniform User Distribution will cut down System Capacity. 2. Outer Interference Factor will be decayed and result in promoting the number of System Users while increasing Path Loss Factor . 3. The quantity of Shadowing  will do a few effect of System Capacity. 4. Adding an Antenna Diversity will enhance more System Capacity than adding a Sectoring Area. 5. Putting down the of P.C.E. will improve much more System Capacity than using the schemes of Antenna Diversity and Sectorization.

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Yen, Shr-Jie, i 嚴仕傑. "Effects of Imperfect Power Control on the Performance of M-ary DS-CDMA Systems". Thesis, 2003. http://ndltd.ncl.edu.tw/handle/05427919659958723700.

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碩士
義守大學
電機工程學系
91
In this thesis, the system performance of an M-ary DS-CDMA system with antenna diversity array is investigated for coherent and noncoherent reception of uplink signals. In addition, the effect of imperfect power control resulting in a lognormal distribution of signal power on the system performance is also studied. Theoretical expressions for the bit error rate (BER) performance as a function of number of orthogonal signal set element M, number of active users, and branch of diversity are derived for different power control errors. For a prescribed BER, the system capacity in terms of number of active users that can be supported under imperfect power control is evaluated and compared for the coherent and noncoherent reception. The results show that the M-ary orthogonal modulation and diversity technique can offer great performance improvement, even under imperfect power control. However, the advantage of M-ary technology is almost lost due to bad power control, even increasing the number of orthogonal signal set element M. For a specified performance, the derived results can be used as guides in evaluating the required quality of power control for a DS-CDMA system with various scenarios, such as different number of orthogonal signal set element M, different branch of diversity, and coherent or noncoherent reception. Simulation results verify the theoretical derivations.

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Wu, Kuen-Joe, i 吳坤周. "PERFORMANCE OF DS-CDMA WITH PREDETECTION DIVERSITY IMPAIRED BY IMPERFECT POWER CONTROL FOR INDOOR RADIO COMMUNICATIONS". Thesis, 1995. http://ndltd.ncl.edu.tw/handle/09079262202202266952.

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碩士
國立中央大學
電機工程研究所
83
In this thesis, the performance of a direct sequence codeivision multiple access system with imperfect power controlperated over a multipath fading indoor radio channel isnalyzed. It has been suggested that DS-CDMA be used as aultiple access predetection diversity method and power controlo resist the effects of multipath fading and near-far problemor indoor radio channel. In practical, power control schemes not perfect and the degradation in performance will occurue to the imperfect power control. Therefore, we consider theffect of the performance of the DS-CDMA system impaired bymperfect power control, when receivers employ coherent BPSKemodulation or noncoherent DPSK demodulation for indoor radioommunication. The performance evaluations of these schemes haveeen made in our simulation and the performances of theredetection multipath diversity with channel coding impairedy imperfect power control are also investigated.

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He, Kuei-Chuan, i 何桂泉. "DS-CDMA INTERNAL DIVERSITY IN THE LOW EARTH ORBITING SATELLITE CHANNEL : SYSTEM PERFORMANCE WITH IMPERFECT POWER CONTROL". Thesis, 1995. http://ndltd.ncl.edu.tw/handle/78637686966538677052.

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碩士
國立中央大學
電機工程研究所
83
In this thesis,weuse the DS-CDMA to combat multipath effect, mperfect power control to reduce the near-far ratio interference,nternal diversity to enhance the recive singals and to analyzehe system performance in Rician and Rayleigh fading conditionsn the low earth orbiting satellite channel .Numerical resultsre computed under the different system's and channel's parametersThe numerical results indicate that performance of the systemse DS-CDMA system combining internal diversity with maximal ratiore effective improvement. Since these combining schemes cangainst the interference and delay spread,and the accurate powerontrol can reduce the near-far- ratio interference.

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Dewangan, Vikas Kumar. "Role of Power Control in Enhancing the Performance of Opportunistic Selection Schemes". Thesis, 2015. https://etd.iisc.ac.in/handle/2005/4798.

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Opportunistic selection reaps the benefits of multiuser diversity in many wireless applications. For example, it increases throughput of cellular networks, lifetime of wireless sensor networks, and improves diversity in cooperative relay systems. In it, the best node is selected for data transmission. The ability of a node to improve the system performance is quantified by a real-valued metric. The best node is the one with the highest metric. Since the nodes are geographically separated, no node in the network knows beforehand who the best node is. Hence, distributed selection schemes are required. We investigate the role of power control in distributed selection schemes. Power control allows the nodes to choose their target receive power from a set of pre-specified power levels. These levels are set such that a node can be selected even if some other nodes transmit with it but do so with lower power levels. Without power control, this would have resulted in a wasteful collision. First, we propose a new timer-based selection scheme with power control. In it, each node sets its timer and its target receive power level as a function of its metric. We develop several structural insights, about the optimal metric-to-timerand- power mapping, which maximizes the probability of selecting the best node. These significantly reduce the computational complexity of finding an optimal mapping and lead to valuable asymptotic insights. We show that the proposed scheme significantly outperforms the conventional timer-based selection scheme. Performance improvements as large as 28.2% are achieved even with only two target receive power levels. We also analyze the performance of the proposed scheme with imperfect power control, which is inevitable in practice. It randomly changes a node’s receive power and, thus, its signal-to-interference-and-noise ratio. Consequently, it affects the probability of selection of the best node and of no node getting selected. It can even lead to a sub-optimal node getting selected. We derive the probability of each of these effects. We observe that by increasing the lowest target receive power level enough, the reduction in probability of selection of the best node can be restricted to be within 9%. Lastly, we characterize the effect of imperfect power control on an alternate scheme known as the splitting-based selection scheme with power control. This scheme maintains a set of thresholds for each slot, which determine the nodes that transmit in that slot and their target receive power levels. The outcome of a slot is used to update the thresholds for the next slot. In case of a collision, the set of colliding nodes is split in two smaller subsets, the nodes in one of which transmit in the next slot. We analyze the average number of slots required for selection with perfect and imperfect power control. We also compute the probability that the best node or a sub-optimal node gets selected in each slot, and the probability that no node ever gets selected due to imperfect power control. The implications of imperfect power control on system throughput are also investigated. We show that imperfect power control reduces the system throughput. We also evaluate the effect of peak power constraint on the performance of the timer-based and splitting-based selection schemes with power control. We show that it can reduce the probability of selection of the two schemes by as much as 19.1% and 9.7%, respectively, when the metric and channel gain are uncorrelated depending on the system parameters.

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Książki na temat "Imperfect Power Control"

Imperfect control: Our lifelong struggles with power and surrender. New York: Simon & Schuster, 1998.

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Millikan, David. Imperfect company: Power and control in an Australian Christian cult. Port Melbourne, Vic: William Heinemann Australia, 1991.

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Viorst, Judith. Imperfect Control: Our Lifelong Struggles with Power and Surrender. Simon & Schuster, Limited, 2014.

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Viorst, Judith. Imperfect Control: Our Lifelong Struggles With Power and Surrender. Free Press, 1999.

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Falk, Oren. Violence and Risk in Medieval Iceland. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780198866046.001.0001.

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This interdisciplinary study of violence in medieval Iceland pursues three intertwined goals. First, it proposes a new cultural history model for understanding violence. The model has three axes: power, signification, and risk. Analysis in instrumental terms, as an attempt to coerce others, focuses on power. Analysis in symbolic terms, as an attempt to manipulate meanings, focuses on signification. Analysis in cognitive terms, as an attempt to exercise agency over imperfectly controlled circumstances, focuses on risk. The axis of risk is the model’s major innovation and is laid out in detail, using insights from prospect theory, edgework, and the calculus of jeopardy. It is shown that violence, which itself generates risks, at the same time also serves to control uncertainties. Second, the book tests this model on a series of case studies from the history of medieval Iceland. It examines how violence shapes present circumstances, future status, and past memories, and how it transforms uncertain reality into socially useful narrative, showing how Icelanders’ feud paradigm blocked the prospects of warfare and state formation, while their idiom of human violence domesticated the natural environment. Third, the book develops the concept of uchronia, the hegemonic ideology of the past, to explain how texts modulate history. Uchronia is a motivated cultural memory which vouches for historical authenticity (regardless of factual reliability), maintains textual autonomy from authorial intent, and secures a fit between present society and its own past. In medieval Iceland, as often elsewhere, violence played a key role in the making of uchronia

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Sepúlveda, Jovanny, red. Interdisciplinariedad, pedagogía y proyectos formativos. CUA - Medellin, 2020. http://dx.doi.org/10.52441/edu202003.

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La comunicación de la ciencia, en sí misma no es ciencia, pero sí contribuye a ella y a la difusión del conocimiento. ¿Por qué publicamos? Primero porque la investigación científica hoy es epistemología + metodología + tecnología+ comunicación del conocimiento, lo que también plantea la importancia de la gestión del conocimiento. La ciencia hoy no se hace para que se quede en informes o anaqueles, sino para que pueda ser difundida, utilizada y apropiada por otros. La publicación es un paso de puesta en validación en el medio, entre pares o entre beneficiarios finales de los resultados del proceso de investigación, y por tanto, de la gestión del conocimiento iniciada con un proyecto en su momento. La publicación hace visibles los hallazgos, pero también los nuevos saberes, las nuevas ideas, las nuevas explicaciones, los nuevos objetos dentro de la cultura de lo humano. La ciencia, la tecnología y la innovación, como prácticas sociales -tal como lo expresa el prólogo- son además actividades culturales que buscan ser visibles, hacerse públicas para dar pie a una función social y cognitiva más profunda: generar trascendencia del saber humano en la historia. Las publicaciones son solo piezas retóricas de un quehacer mucho más comprometedor: motivar nuevos procesos de búsqueda, nuevos procesos cognitivos en otros. Y es que como dice Bruno Latour (2017), hacer ciencia tiene mucho de ejercicio político y de ejercicio cultural en nuestras sociedades contemporáneas. Los científicos contemporáneos desde su función social, plantean -no todos, pero sí los más conscientes- la batalla contra la dictadura del beneficio (la rentabilidad económica de la ciencia que se inculcó durante el siglo XX), a partir de la libertad y la gratuidad del conocimiento y la investigación. Publicar, y mucho más volver al libro como dispositivo de comunicación, motiva un conocer diferente, un conocer desde el deseo de entregar como acto generoso lo aprendido. La ciencia en la antigüedad, como lo plantea Ordine (2013), nace de la curiosidad y de la admiración. Son los fenómenos de lo cotidiano, de lo común, los que mueven a los primeros filósofos a generar saber. El estudio, como dice Ordine es en primer lugar adquisición de conocimientos que “sin vínculo utilitarista alguno, nos hacen crecer y nos vuelven autónomos” (p. 45). Así pues, el estudio y la investigación están motivados por la gratuidad de la admiración del mundo y de la realización del ser humano en su proceso de búsqueda de sabiduría. Aquí cabe retomar a Poincaré (1904 citado por Ordine, 2013): El hombre de ciencia no estudia la naturaleza porque sea útil; la estudia porque encuentra placer, y encuentra placer porque es bella. Si la naturaleza no fuera bella, no valdría la pena conocerla, ni valdría la pena vivir la vida. No hablo aquí, entendámoslo bien, de esta belleza que impresiona los sentidos, de la belleza de las cualidades y de las apariencias; no es que la desdeñe, lejos de ahí, pero no tiene nada que ver con la ciencia. Quiero hablar de esa belleza, más íntima, que proviene del orden armonioso de las partes y que solo una inteligencia pura puede comprender. Por así decirlo es ella la que da un cuerpo, un esqueleto a las halagadoras apariencias que embellecen nuestros sentidos, y sin este soporte, la belleza de estos sueños fugitivos sería imperfecta, porque sería indecisa y huiría siempre (p. 61). Y finaliza Ordine: Hay que saber poner la mira en “la belleza intelectual” que “se basta a sí misma”. Por ella sola, “más quizá que por el bien futuro de la humanidad”, “el hombre de ciencia se condena a largos y penosos trabajos” (p. 21). Sin este laborioso y desinteresado esfuerzo, sería realmente difícil pensar en hacerse mejores (p. 61). Los autores de la presente compilación han comprendido esta belleza intelectual desde los saberes y disciplinas más diversos: la antropología pedagógica, la educación, la psicología, la comunicación. Si bien el eje central es la educación y este libro se enmarca en una visión de educación desde diferentes intereses, el origen de nuestros autores es variado y multidisciplinar, como podrá evidenciar el lector en las siguientes páginas. La educación, es una práctica cultural propia de nuestras sociedades occidentales que debe hacer visibles sus reflexiones desde la perspectiva científica. La capacidad de sistematización de lo aprendido en el aula, del proceso de conocimiento desde los niveles más básicos hasta los más avanzados, es la clave de una producción científica desde el campo formativo. Hoy encontramos esa evidencia de las búsquedas, de las comprensiones, de las iniciativas de realización del ser humano en muchos de los apartados de estos textos que los autores comparten con nosotros.

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Części książek na temat "Imperfect Power Control"

Bo, Xiaoming, i Zujue Chen. "Call Admission Control for Multimedia CDMA Networks under Imperfect Power Control". W Lecture Notes in Computer Science, 467–77. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-540-39425-9_55.

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Li, Hangqi, Xiaohui Zhao i Yongjun Xu. "Min-max BER Based Power Control for OFDM-Based Cognitive Cooperative Networks with Imperfect Spectrum Sensing". W Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 654–67. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-40352-6_54.

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Jerez, Juan Manuel Romero, Margarita Ruiz García i Antonio Díaz Estrella. "Performance Analysis of a Cellular Slotted CDMA System with Imperfect Power Control over a Rayleigh Fading Channel". W Multiaccess, Mobility and Teletraffic in Wireless Communications: Volume 4, 253–62. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4757-5920-4_26.

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Bhadu, Mahendra, K. G. Sharma, D. K. Pawalia i Jeetendra Sharma. "A Comparative Analysis on Wide-Area Power System Control with Mitigation the Effects of an Imperfect Medium". W Advances in Intelligent Systems and Computing, 157–66. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-6981-8_13.

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Townsend, Peter. "Valuable imperfections in crystal lattices". W The Power of Imperfections, 160–72. Oxford University Press, 2022. http://dx.doi.org/10.1093/oso/9780192857477.003.0010.

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Crystal lattice structures are prone to error with both localized faults of impurities or misplaced atoms, and more major long-range flaws. The chapter discusses the many ways in which a lattice may be imperfect, both at the localized level of nearby neighbours, or with larger grains, boundaries and inclusions. All types exist and variously offer beneficial or negative features for various properties of the material options and how they influence the overall properties. Some very simple, well-characterized defect structures are discussed and from there one tries to extrapolate to more complex systems. Imperfections are variously valuable or destructive, and therefore understanding and control are critical. In reality this is challenging and so the examples used here are idealized but, because they are based on simple structures, they are readily understandable.

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Zhang, Lanyong, i Ziming Yuan. "Modeling of Ship Micro-Grid Based on Wind and Solar Power Generation Technology". W Frontiers in Artificial Intelligence and Applications. IOS Press, 2021. http://dx.doi.org/10.3233/faia210181.

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Under the influence of environmental issues and energy crises, wind and solar power generation technologies have developed rapidly. Compared with terrestrial micro-grid, this technology has relatively few applications on ships. Aiming at the problems of low energy utilization rate of ship micro-grid, imperfect control strategy, and single simulation situation, this paper uses the construction method of terrestrial micro-grid to build a detailed ship micro-grid model based on wind and solar power generation technology on the MATLAB/simulink simulation platform, and uses hill climbing search Method and disturbance observation method to control wind and photovoltaic power generation system. In the simulation process, several situations of wind speed, light intensity, and load sudden changes during the operation of the micro-grid were simulated. The simulation results show that the micro-grid model can track the maximum power point in real time, and the wind energy utilization rate is increased to 0.48, and the bus voltage and current are equal. The actual operation requirements are met, and the correctness and effectiveness of the simulation model and control strategy are verified, which is helpful to the in-depth study of the construction of the ship micro-grid model.

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Iturralde, Manuel. "The Weight of Empire". W Decolonizing the Criminal Question, 53—C3P106. Oxford University PressOxford, 2023. http://dx.doi.org/10.1093/oso/9780192899002.003.0004.

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Abstract During the last two decades, Latin American scholars have shown an increasing interest in the region’s crime control fields as an object of study. Nonetheless, the analysis of crime, violence, and social control in Latin America is still marginal in Global North discussions. In the cases that Global North criminologists acknowledge the Global South, it is often depicted as an imperfect realization of universal theories and laws of development. This rhetorical device marshals the assumption that Global South countries are bound to follow the path of Global North societies to reach modernity as a superior stage of development. This setup has cleared the way for the ‘standard’ perspectives and highly punitive penal policies that predominate in Latin American societies. These policies and practices are not simply the reproduction and adaptation of discourses that travel from Global North countries. Instead, they lay roots in a colonial past that is still felt in the present-day realities of many Global South countries through global hierarchical market relations, extreme forms of inequality, injustice, and violence that constitute neocolonial forms of unequal power relations. This chapter focuses on some of the most salient features of Latin American crime control during the last three decades. It discusses how these fields of crime control are deeply connected to Latin American countries’ historical trajectories and the dynamics of colonialism and neocolonialism. The latter is not just a remnant of the past but an acting force that profoundly affects the political economy of Latin American societies.

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Brownill, Sue, i Quintin Bradley. "Introduction". W Localism and Neighbourhood Planning, 1–16. Policy Press, 2017. http://dx.doi.org/10.1332/policypress/9781447329497.003.0001.

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This introductory chapter provides an overview of neighbourhood planning, which builds on a long history of community-based planning and can be seen as the latest in a series of initiatives that have attempted to ‘fix’ what is seen as the restricted and imperfect opportunities for the public to engage in the planning system. Given the prospect that neighbourhood planning can extend local control and reinvigorate democratic engagement, issues of empowerment and democracy are key to its appeal and consideration. Neighbourhood planning also has to be seen in the context of the rise of localism, characterised by the scalar and spatial dispersal of power, which has become a key feature of contemporary governance. Neighbourhood planning is both a particularly English phenomenon which deserves to be explored in more depth, and a microcosm of key planning issues that has resonance for wider debates on participation, localism and the purposes and practices of planning. As such, this book critically explores neighbourhood planning through empirical evidence on how it is evolving and by placing these experiences in the context of existing debates on governance and planning in an international context.

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Kaye, Phillip, Raymond Laflamme i Michele Mosca. "Quantum Error Correction". W An Introduction to Quantum Computing. Oxford University Press, 2006. http://dx.doi.org/10.1093/oso/9780198570004.003.0013.

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A mathematical model of computation is an idealized abstraction. We design algorithms and perform analysis on the assumption that the mathematical operations we specify will be carried out exactly, and without error. Physical devices that implement an abstract model of computation are imperfect and of limited precision. For example, when a digital circuit is implemented on a physical circuit board, unwanted electrical noise in the environment may cause components to behave differently than expected, and may cause voltage levels (bit-values) to change. These sources of error must be controlled or compensated for, or else the resulting loss of efficiency may reduce the power of the information-processing device. If individual steps in a computation succeed with probability p, then a computation involving t sequential steps will have a success probability that decreases exponentially as pt. Although it may be impossible to eliminate the sources of errors, we can devise schemes to allow us to recover from errors using a reasonable amount of additional resources. Many classical digital computing devices use error-correcting codes to perform detection of and recovery from errors. The theory of error-correcting codes is itself a mathematical abstraction, but it is one that explicitly accounts for errors introduced by the imperfection and imprecision of realistic devices. This theory has proven extremely effective in allowing engineers to build computing devices that are resilient against errors. Quantum computers are more susceptible to errors than classical digital computers, because quantum mechanical systems are more delicate and more difficult to control. If large-scale quantum computers are to be possible, a theory of quantum error correction is needed. The discovery of quantum error correction has given researchers confidence that realistic large-scale quantum computing devices can be built despite the presence of errors. We begin by considering fundamental concepts for error correction in a classical setting. We will focus on three of these concepts: (a) the characterization of the error model, (b) the introduction of redundancy through encoding, and (c) an error recovery procedure. We will later see that these concepts generalize quite naturally for quantum error correction.

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Li, Jean. "Egypt before the Saites". W The Oxford History of the Ancient Near East Volume IV, 1—C35P257. Oxford University PressNew York, 2023. http://dx.doi.org/10.1093/oso/9780190687632.003.0035.

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Abstract The Third Intermediate Period spanned the time period from the end of the New Kingdom (ca. 1070 bc) to the subsequent reassertion of Egyptian control by the Saite 26th Dynasty (664 bc). Virtually all aspects of the history, archaeology, and social and cultural developments of this era are complex, imperfectly understood, and subject to continued revision. Once characterized as a time of political weakness and cultural decay, Egypt before the Saites witnessed a dynamic period of diffusion of power, in which historically marginalized groups (foreigners and women) participated. The chapter also focuses on the tension between innovative interpretations of cultural concepts and practices, such as kingship, afterlife, religion, and written and material culture, and their place within the framework of enduring Egyptian traditions.

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Streszczenia konferencji na temat "Imperfect Power Control"

Tugnait, Jitendra K. "Pilot decontamination under imperfect power control". W 2017 51st Asilomar Conference on Signals, Systems, and Computers. IEEE, 2017. http://dx.doi.org/10.1109/acssc.2017.8335513.

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Liping Li, J. K. Townsend i Robert J. Ulman. "Performance of Transmitted Reference UWB Communications with Imperfect Power Control". W MILCOM 2007 - IEEE Military Communications Conference. IEEE, 2007. http://dx.doi.org/10.1109/milcom.2007.4455249.

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Memmi, Amen, Zouheir Rezki i Mohamed-Slim Alouini. "Power Control for D2D Underlay Cellular Networks with Imperfect CSI". W 2016 IEEE Globecom Workshops (GC Wkshps). IEEE, 2016. http://dx.doi.org/10.1109/glocomw.2016.7849006.

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Byun, Seok-Ju, i Ye Hoon Lee. "Power Control Scheme for NOMA Random Access with Imperfect SIC". W 2023 Fourteenth International Conference on Ubiquitous and Future Networks (ICUFN). IEEE, 2023. http://dx.doi.org/10.1109/icufn57995.2023.10199825.

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Hossain, Md Mahbub, Md Abdul Awal, Dipankar Roy, Md Asraful Islam i Md Anwar Hossain. "Performance analysis of DS-CDMA under perfect and imperfect power control". W 2009 12th International Conference on Computer and Information Technology (ICCIT). IEEE, 2009. http://dx.doi.org/10.1109/iccit.2009.5407167.

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Chitti, Krishna, Xiaochen Tan i Stephan Ten Brink. "Multi-user uplink power control under imperfect-CSI and probabilistic constraints". W 2014 Sixth International Conference on Wireless Communications and Signal Processing (WCSP). IEEE, 2014. http://dx.doi.org/10.1109/wcsp.2014.6992182.

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Kumar, Preetam, i Saswat Chakrabarti. "BER of Overloaded Cellular DS-CDMA System with Imperfect Power Control". W 2008 IEEE Region 10 and the Third international Conference on Industrial and Information Systems (ICIIS). IEEE, 2008. http://dx.doi.org/10.1109/iciinfs.2008.4798426.

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Feng, Yizhi, Hongjiang Wang i Min Yang. "Uplink analysis for cellular MC-CDMA systems under imperfect power control". W 2009 IEEE International Conference on Communications Technology and Applications (ICCTA). IEEE, 2009. http://dx.doi.org/10.1109/iccomta.2009.5349131.

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Zhang, Shan, i Peimin Yan. "SIR-based call admission control by more realistic imperfect power control for CDMA system". W 2010 International Conference on Audio, Language and Image Processing (ICALIP). IEEE, 2010. http://dx.doi.org/10.1109/icalip.2010.5685006.

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Goken, Cagri, Onur Dizdar i Alptekin Yilmaz. "Filtering for Uplink Non-Orthogonal Multiple Access with Imperfect Received Power Control". W 2019 IEEE 30th Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC). IEEE, 2019. http://dx.doi.org/10.1109/pimrc.2019.8904411.

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