Academic literature on the topic 'Information quantique en variables continues'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Information quantique en variables continues.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Journal articles on the topic "Information quantique en variables continues"
1
Bencheikh, K., A. Jankovic, T. Symul, and J. A. Levenson. "Cryptographie quantique à variables continues." Journal de Physique IV (Proceedings) 12, no. 5 (June 2002): 167–69. http://dx.doi.org/10.1051/jp4:20020120.
Full text
2
Suwarman, Rusmawan, Edi Riawan, Yogi Sahat Maruli Simanjuntak, and Dasapta Erwin Irawan. "Kajian Perubahan Iklim di Pesisir Jakarta Berdasarkan Data Curah Hujan dan Temperatur." Buletin Oseanografi Marina 11, no. 1 (December 21, 2021): 99–110. http://dx.doi.org/10.14710/buloma.v11i1.42749.
Full textAbstract:
Sebagai ibu kota negara dan pusat berbagai kegiatan ekonomi, Jakarta terus mengalami pertumbuhan penduduk dan infrastruktur. Pembangunan ekonomi ini pun mengalami pergeseran ke wilayah pesisir utara Jakarta. Di sisi lain, perubahan iklim adalah permasalahan yang harus dihadapi secara global, termasuk Jakarta. Strategi pembangunan perlu mempertimbangkan aspek-aspek perubahan iklim untuk mengurangi potensi dampak-dampak lingkungan yang akan terjadi. Makalah ini bertujuan untuk menampilkan kondisi iklim saat ini di daerah pesisir utara Jakarta dan potensi perubahannya di masa yang akan datang. Informasi iklim didapatkan dari Badan Meteorologi Klimatologi Geofisika (BMKG), sedangkan informasi proyeksi iklim sampai tahun 2100, didapatkan dari data 21 member dari model iklim global (Global Circulation Models, GCMs). Metode yang digunakan adalah statistical downscaling quantile bias correction untuk mendapatkan informasi proyeksi iklim lokal. Analisa yang disajikan dalam kajian ini adalah analisa ekstrem secara statistik untuk variabel temperatur dan curah hujan. Hasilnya menunjukkan bahwa kondisi iklim baseline sudah mengalami tren kenaikan temperatur sebesar 1,1 C. Potensi kenaikan temperatur ini akan berlanjut sampai 0,5 – 1 C di tahun 2050 dan 1 - 3 C di tahun 2100. Pada variabel curah hujan, perubahan iklim di masa akan datang berdampak mempercepat awal dan memperlama musim hujan. Model-model iklim menunjukan bahwa curah hujan ekstrem akan naik antara 15-26 % pada periode ulang 100 tahun dari kondisi iklim saat ini. As the capital city and the center of various economic activities, Jakarta continues to experience population growth and infrastructure. On the other hand, climate change is an issues that must be faced globally, including Jakarta. Development strategies need to consider the aspects of climate change to reduce potential environmental impacts that will occur. The purpose of this study is to understand the current climate and its potential for future changes in the northern coastal area of Jakarta. Current climate information is obtained from meteorological data from the Meteorology Climatology Geophysics Agency (BMKG) observation station, while climate information of future climate projections, up to 2100, is obtained from 21 member data from Global Circulation Models (GCMs) . The method used is statistical downscaling quantile bias correction to obtain local climate projection information. The analysis presented in this study is a statistical extreme analysis for the variables of the temperature and the rainfall. Based on observation data, the baseline climatic conditions have experienced an increasing trend of temperature of 1.1 C. The potential for this temperature increase will continue to 0.5 – 1 C in 2050 and 1-3 C in 2100. Meanwhile, on the rainfall variable, future climate change has an impact on early of the start and prolonging the rainy season. The climate models show that extreme rainfall will increase between 15-26 % in the 100-year return period of current climatic conditions.
3
Abidin, Abidin, Novia Syafa’a Zahra, and Abdul Yusuf. "Analisis Aplikasi Kredivo Berdasarkan Information System Success Model (ISSM)." Jurnal Maksipreneur: Manajemen, Koperasi, dan Entrepreneurship 12, no. 2 (June 29, 2023): 602. http://dx.doi.org/10.30588/jmp.v12i2.1045.
Full textAbstract:
<em>In this digital era, the implementation of information systems in various areas of life continues to increase. Information system implementations need to be evaluated for their success. Delone and Mclean have developed an information system success model as a framework for measuring the success level of information systems. The purpose of this research is to conduct a thorough analysis, increase knowledge regarding the ISS Model, and find out its relevance as a research basis on the Kredivo FinTech platform. Of the several variables included in the ISSM, the results of this study indicate that only the user satisfaction has a significant effect on net benefits.</em>
4
Nica, Elvira, Milos Poliak, Cristina Alpopi, Tomas Kliestik, Cristina Manole, and Sorin Burlacu. "Impact of Trade, FDI, and Urbanization on Female Employment System in SAARC: GMM and Quantile Regression Approach." Systems 11, no. 3 (March 3, 2023): 137. http://dx.doi.org/10.3390/systems11030137.
Full textAbstract:
The fundamental objective of this research is to learn how trade liberalization, male employment, urbanization, and foreign direct investment (FDI) affect women’s participation in the labor force. To continue, this study aims to determine the effects of trade and other factors on women’s employment in three distinct sectors (i.e., agriculture, industry, and service). From 1991 to 2021, we analyzed data from eight SAARC countries. The study’s theoretical foundation was the Cobb–Douglas production function. To better understand the connections between trade liberalization and the SAARC labor market, this paper used panel quantile regression (QR) and generalized method of moments (GMM) to empirically explore the key determinants of female employment in total and three sub-sectors. The QR method was used in the study because it looks at how variables affect each other beyond the data mean. Additionally, our data set does not follow a normal distribution, and the connection between the explained and explanatory factors is non-linear. Trade openness has a beneficial effect on total female employment throughout system GMM and all quartiles. Total female employment also benefits from an increase in GDP and FDI. However, women’s access to the workforce is hampered by urbanization. Many strategies for increasing women’s participation in the workforce across three sectors are addressed in this article. The major finding of this study is the rate of change in female employment across three industries. Women’s participation in the service and manufacturing sectors increases, whereas their participation in agriculture decreases, as a result of increased trade openness. Although these studies can assist policymakers in choosing the best feasible trade adjustments, they will also add to diverse academic and policy discussions on trade liberalization and its gender consequences. Since trade has become more accessible, more and more women are entering the workforce. Therefore, workers should acquire industrial and service-sector-related competencies.
5
Nguyen, Kimberly T., Juhi Aggarwal, Maryanne L. Campbell, Stephanie Shiau, and Derek G. Shendell. "COVID-19 Vaccine Hesitancy among New Jersey Teachers and Impacts of Vaccination Information Dissemination." Vaccines 11, no. 2 (February 17, 2023): 466. http://dx.doi.org/10.3390/vaccines11020466.
Full textAbstract:
Vaccine hesitancy continues to be prevalent in the United States, especially in relation to the COVID-19 vaccines and its boosters, which have been made increasingly available for public use as the pandemic has progressed. There continues to be concern surrounding the safety and health of secondary or high school education professionals as they transition back to in-person learning and working opportunities. The present study highlights how information dissemination regarding the COVID-19 vaccine has varied among New Jersey secondary or high school teachers throughout the pandemic. The survey was completed online through the PsychData platform by 269 participants between March and July 2022. Participants received the opportunity to complete the survey via email. Afterwards, data were exported and analyzed using Microsoft Excel and SAS 9.4 Analytics Software and stratified by various clinical and demographic-based variables. While trusted agencies and media outlets identified by participants varied, most participants identified the Centers for Disease Control and Prevention (65.4%), primary care providers (37.5%), and state health departments (28.6%) as their top trusted sources for information related to COVID-19 vaccines. Overall, COVID-19 vaccination advocacy and educational efforts should continue across the state of New Jersey and elsewhere, especially as more variants emerge and boosters become available.
6
Yin, Tao, Hong Ping Zhu, and Dian Qing Li. "Optimal Sensor Configuration for Bridge Structures Following a Probabilistic Approach." Advanced Materials Research 594-597 (November 2012): 1098–104. http://dx.doi.org/10.4028/www.scientific.net/amr.594-597.1098.
Full textAbstract:
In this paper, a statistical methodology is introduced for identifying the most effective way to install a limited number of sensors on a typical distributed-parameter system, i.e., a three-span continuous bridge model with two elastic supports to extract as much information as possible. This is performed by minimizing the uncertainties associated with the identified bridge modeling parameters. In the proposed methodology, the information entropy is employed as a measure to quantify the uncertainty of the identified structural modeling parameters. The problem of optimal sensor placement is then formulated as a continuous optimization problem, in which the information entropy is minimized, with the sensor configurations as the minimization variables. The generally used discrete-coordinate systems modeled by the finite element (FE) method can only approximate their actual dynamic behavior, which would in turn influence the sensor configuration results, and the sensors are confined to be only put on discrete nodes related to the coarse mesh scheme usually employed. For structures such as bridges belonging to typical distributed-parameter systems, it’s more reasonable and convenient to be modeled as continues-coordinate system with analytical formulation. It’s the main purpose of this paper to develop a sensor placement method for continues-coordinate systems following the Bayesian theorem and the information entropy method, with the binary-encoded genetic algorithm (GA) employed as the optimization technique.
7
Harianti, Renny, and Anna Sardiana. "PENGARUH KINERJA KEUANGAN DAN FIRM SIZE TERHADAP HARGA SAHAM PADA INDEX SAHAM SYARIAH." Paradigma 19, no. 2 (August 29, 2022): 41–54. http://dx.doi.org/10.33558/paradigma.v19i2.4572.
Full textAbstract:
The Islamic capital market in Indonesia continues to grow, especially in the List of Sharia Securities (DES). Each year the DES on the stock effect continues to increase in the number of issuers. In Islamic stocks there are several stock indices, one of which is the Jakarta Islamic Index (JII). The JII index has decreased and increased in the 2014-2017 period. Usually, investors will analyze before buying shares, one of them is by doing a fundamental analysis or looking at the company's financial performance, so that investors will get information about the profit opportunities that they will get. Therefore this study aims to analyze and provide empirical evidence of the effect of Net Profit Margin (NPM), Return on Equity (ROE), Earning per Share (EPS), Debt Equity Ratio (DER) and Firm Size on the stock price of companies listed in JII. The samples used in this study were 18 company stock prices with the 2014-2017 time period. Based on the results of testing using EViews 10 software, simultaneously NPM, ROE, EPS, DER, and Firm Size have a significant effect on stock prices. While partially only the ROE and EPS variables have a significant effect on stock prices. Other variables, NPM, DER, and Firm Size have no significant effect on stock prices.
8
Gerido, Lynette Hammond, Xiang Tang, Brittany Ernst, Aisha Langford, and Zhe He. "Patient Engagement in Medical Research Among Older Adults: Analysis of the Health Information National Trends Survey." Journal of Medical Internet Research 21, no. 10 (October 29, 2019): e15035. http://dx.doi.org/10.2196/15035.
Full textAbstract:
Background By 2035, it is expected that older adults (aged 65 years and older) will outnumber children and will represent 78 million people in the US population. As the aging population continues to grow, it is critical to reduce disparities in their representation in medical research. Objective This study aimed to describe sociodemographic characteristics and health and information behaviors as factors that influence US adults’ interest in engaging in medical research, beyond participation as study subjects. Methods Nationally representative cross-sectional data from the 2014 Health Information National Trends Survey (N=3677) were analyzed. Descriptive statistics and weighted multivariable logistic regression analyses were performed to assess predictors of one’s interest in patient engagement in medical research. The independent variables included age, general health, income, race and ethnicity, education level, insurance status, marital status, and health information behaviors. Results We examined the association between the independent variables and patient interest in engaging in medical research (PTEngage_Interested). Patient interest in engaging in medical research has a statistically significant association with age (adjusted P<.01). Younger adults (aged 18-34 years), lower middle-aged adults (aged 35-49 years), and higher middle-aged adults (aged 50-64 years) indicated interest at relatively the same frequency (29.08%, 29.56%, and 25.12%, respectively), but older adults (aged ≥65 years) expressed less interest (17.10%) than the other age groups. After the multivariate model was run, older adults (odds ratio 0.738, 95% CI 0.500-1.088) were found to be significantly less likely to be interested in engaging in medical research than adults aged 50 to 64 years. Regardless of age, the strongest correlation was found between interest in engaging in medical research and actively looking for health information (P<.001). Respondents who did not seek health information were significantly less likely than those who did seek health information to be interested in engaging in medical research. Conclusions Patients’ interest in engaging in medical research vary by age and information-seeking behaviors. As the aging population continues to grow, it is critical to reduce disparities in their representation in medical research. Interest in participatory research methods may reflect an opportunity for consumer health informatics technologies to improve the representation of older adults in future medical research.
9
Puji, Milan, and Krismanti Tri Wahyuni. "Analysis of the Effect of Technology on the Growth of the Information and Communication Sector in the Bali Province 2016-2021." Proceedings of The International Conference on Data Science and Official Statistics 2023, no. 1 (December 29, 2023): 417–29. http://dx.doi.org/10.34123/icdsos.v2023i1.291.
Full textAbstract:
Technology continues to develop and drive economic growth. Bali, as a province that is open to foreign tourists in Indonesia, has a great opportunity to adopt technology more quickly. This study aims to analyze the effect of technology development as well as other variables such as the number of workers in the ICT sector, household consumption for Information and Communication Technology (ICT), and the amount of accommodation for Gross Regional Domestic Product (GRDP) of the ICT Sector in districts/cities of Bali Province. The analysis to be used is descriptive and inferential analysis with panel data regression from regencies/cities in Bali Province period 2016-2021. The model used is the fixed effect model. In general, the GRDP of the ICT Sector continues to increase, but its growth is decreasing every year. Meanwhile, technological developments in Bali Province tend to increase every year. With a significance level of 5 percent, the percentage of e-commerce users, the percentage of ownership of cell phones, and the number of accommodations have a significant positive effect on the GRDP of the ICT sector. Technological progress has not been fully utilized, therefore the GRDP growth of the ICT sector tends to decrease every year.
10
Kohnle, Antje. "Quantum Processes, Systems and Information by Benjamin Schumacher & Michael Westmoreland." New Directions in the Teaching of Physical Sciences, no. 10 (June 1, 2014): 64–65. http://dx.doi.org/10.29311/ndtps.v0i10.519.
Full textAbstract:
Quantum Processes, Systems and Information is a textbook aimed at advanced undergraduate students that brings together more traditional quantum mechanics topics and quantum information theory. The book is novel both in this focus and its presentation of the material. The first five chapters discuss the basics of quantum theory using three isomorphic two-level systems: a photon in a Mach–Zehnder interferometer, a spin ½ particle and a two-level atom. These chapters also develop basic quantum information concepts such as the entropy of a message, interpreting unitary time evolution in terms of information capacity and the difference between distinct and distinguishable states in terms of the basic decoding and distinguishability theorems. The text then continues (chapters 6–9) with two-particle states, including entanglement, hidden variables, the no-cloning theorem, density operators and open systems. The transition to continuous systems, the starting point for many quantum mechanics textbooks, is made only in chapter 10, and the following chapters include standard wave mechanics found in many texts. The final three chapters revert the focus back to quantum information processing.
Dissertations / Theses on the topic "Information quantique en variables continues"
1
Minneci, Aurianne. "Information quantique : optique quantique en variables continues." Thesis, Sorbonne Paris Cité, 2018. http://www.theses.fr/2018USPCC121/document.
Full textAbstract:
L’information quantique peut être traitée sur différents types de systèmes physiques. Elle peut également être traitée selon deux façons fondamentalement différentes, en usant soit des variables discrètes, soit des variables continues. Dans cette thèse, nous nous concentrons sur l’optique quantique en variables continues et les expériences étudiées sont basées sur l’utilisation de photons. Après une introduction à quelques notions de base de la mécanique quantique, nous présentons un protocole sous-universel d’informatique quantique, appelé Boson Sampling, précédé d’une partie exposant des éléments de théorie de la complexité nécessaires pour comprendre la preuve de supériorité quantique de ce protocole. Puis, nous proposons un modèle pour décrire la création de qudits intriqués dans une expérience réalisée au sein de notre équipe. Enfin, la dernière partie de cette thèse présente une interprétation physique plus fondamentale des résultats obtenus lors d’expériences de type Hong-Ou-Mandel avec des filtres en fréquence devant les photodétecteurs, et montre qu’il s’agit d’une partie d’un état chat de Schrödinger produit par post-sélectionQuantum information can be processed on differents types of physical systems. It can also be processed in two fundamentally different ways, using either discrete or continuous variable implementations. In this thesis, we concentrate on quantum optics in continuous variables and the studied experiments are based on the use of photons. After an introduction to some basic notions of quantum mechanics, we present a subuniversal protocol of quantum computing, named Boson Sampling, preceded by a part exposing elements of complexity theory which are necessary to understand the quantum superiority proof of this protocol. Then, we propose a model to describe the creation of entangled qudits in an experiment done in the team. Finally, the last part of this thesis presents a more fundamental physical interpretation of the results obtained during Hong-Ou-Mandel experiments with frequency filters in front of the photodetectors, and shows that we have a part of a Schrödinger cat state, produced by postselection
2
Treps, Nicolas. "Optique Quantique Multimode en Variables Continues." Habilitation à diriger des recherches, Université Pierre et Marie Curie - Paris VI, 2006. http://tel.archives-ouvertes.fr/tel-00131679.
Full textAbstract:
Nous considérons la description quantique de la lumière dans lerégime des variables continues, où les photons ne sont pas
distinguables individuellement. Dans la limite des petites
fluctuations quantiques, nous cherchons à augmenter la richesse,
et les possibles applications, des états quantiques produits en
multipliant le nombre de "modes" -ou degrés de libertés- mis en
jeu par le processus de détection. C'est ce que nous appelons
l'optique quantique multimode. Dans ce cadre, nous voyons comment,
en pratique, compter le nombre de modes pertinents au sein d'un
faisceau lumineux. Puis nous reprenons la théorie de la mesure
optique pour associer le caractère multimode de la lumière à la
recherche d'information dans un faisceau. Par cette approche, nous
redéfinissons les limites ultimes de la mesure et nous considérons
l'intrication quantique à partir de n'importe quelle grandeur
mesurable. Nous illustrons cette théorie par des expériences
mettant en jeu de plus en plus de modes : mesures de photons
jumeaux, intrication et téléportation quantique, mesure et
réduction du bruit de polarisation, nano-positionnement d'un
faisceau au delà de la limite quantique standard, intrication
spatiale, amplification sans bruit d'images et optique quantique
multimode avec des peignes de fréquence. Nous évoquons également
les possibles applications à l'accroissement des capacités de
stockage et de transfert d'information, au traitement en parallèle
de l'information quantique et à l'amélioration les techniques
d'imagerie et de métrologie.
3
Grosshans, Frédéric. "Communication et cryptographie quantiques avec des variables continues." Phd thesis, Université Paris Sud - Paris XI, 2002. http://tel.archives-ouvertes.fr/tel-00002343.
Full textAbstract:
Ces dernières années, les variables continues ont émergées en tant qu alternative aux variables discrètes dans les communications quantiques. Cette thèse s'inscrit dans ce cadre des communications quantiques avec des variables continues. Les variables continues utilisées ici sont les quadratures d'un mode du champ électromagnétique. Pour les mesurer, nous avons construit une détection homodyne équilibrée, limitée au bruit de photons, impulsionnelle et résolue en temps. Celle-ci peut effectuer 800 000 mesures par seconde. En se fondant sur la limite de la duplication quantique, nous montrons qu'une valeur de la fidélité supérieure à 2/3 dans un protocole de téléportation quantique garantit que l'état téléporté est la meilleure copie qui reste de l'état d'entrée. Nous introduisons de nouveaux protocoles de distribution quantique de clef utilisant des variables quantiques continues, sûrs face à des attaques individuelles pour toute valeur de la transmission de la ligne optique entre Alice et Bob. En particulier, il n'est pas nécessaire que cette transmission soit plus grande que 50 % (moins de 3 dB de pertes). Ni compression des fluctuations quantiques, ni intrication ne sont nécessaires. Nous avons implémenté expérimentalement ces protocoles, en utilisant la détection homodyne limitée au bruit de photon mentionnée plus haut et des états cohérents. L'extraction complète de la clef secrète est réalisée en utilisant une technique de réconciliation par tranches inversée suivie d amplification de confidentialité. Notre dispositif expérimental produit un taux net de transmission de clef de 1,7 megabits par seconde pour une ligne sans pertes, et 75 kilobits par seconde pour une ligne avec 3,1 dB de pertes. Les limitations actuelles sont essentiellement techniques et proviennent surtout de l'efficacité limitée du logiciel de réconciliation.
4
Douce, Tom. "Realistic quantum information processing : from devices to computational models." Thesis, Sorbonne Paris Cité, 2016. http://www.theses.fr/2016USPCC201/document.
Full textAbstract:
La théorie du calcul quantique se situe à la frontière de la physique quantique et de l’informatique. Par conséquent, les deux domaines contribuent à la rendre d’autant plus riche en apportant leurs propres méthodes et outils mathématiques. La présente thèse tente de mettre en évidence cette particularité en traitant des problématiques qui vont la physique expérimentale aux modèles de calcul. Le but est d’offrir de nouvelles possibilités pour démontrer un avantage quantique. Après une brève introduction aux notions de base de la mécanique quantique, certains aspects liés à l’informatique sont discutés. Le formalisme des classes de complexité quantiques ainsi que le concept du calcul quantique en variables continues sont décrits. Ensuite, le modèle connu comme instantaneous quantum computing est traduit en variables continues, le rendant attrayant d’un point de vue expérimental. Le chapitre conclut sur une discussion concernant un protocole hybride impliquant l’algorithme de Grover dans le cadre des communications quantiques. La dernière partie de la thèse s’intéresse à des problématiques issues de la physique expérimentale. Le lien entre l’effet Hong-Ou-Mandel et la fonction de Wigner d’un état à deux photons est mise en évidence, et un protocole expérimental est décrit en conséquence. La suite traite du domaine des circuits supraconducteurs et envisage de possibles expériences. Il est montré comment utiliser un qubit de flux pour manipuler un centre coloré du diamant. Il est également décrit comment sonder le modèle de Rabi dans le régime de couplage ultra fort en utilisant un qubit supplémentaire faiblement coupléThe theory of quantum computing lies at the very boundary between quantum physics and computer science. As such, both fields bring their own methods and mathematical tools to make quantum computing even richer. The present thesis attempts to reflect this specificity by addressing questions ranging from experimental physics to computational models. The goal is to provide novel ways of demonstrating quantum advantage. After a short introduction to basic notions of quantum mechanics, some computer science aspects are discussed. We describe the powerful formalism of quantum complexity classes and the concept of quantum computations based on continuous variables. We then translate the model of instantaneous quantum computing to continuous variables, which is experimentally appealing. The chapter concludes with a discussion on a hybrid protocol involving Grover’s algorithm in a quantum communication framework. The last part of the thesis is devoted to experimentally driven issues. A fundamental connection between the Hong-Ou-Mandel experiment and the Wigner function of two-photon states is derived and a verification protocol is designed accordingly. We then move to the field of superconducting circuits to discuss proposals for future experiments. We show how to use a flux qubit to manipulate a NV color center. We also describe how to use to probe the Rabi model in the ultra strong coupling regime using an additional weakly coupled qubit
5
Arzani, Francesco. "Measurement based quantum information with optical frequency combs." Thesis, Paris Sciences et Lettres (ComUE), 2018. http://www.theses.fr/2018PSLEE005/document.
Full textAbstract:
Ce manuscrit porte sur l’étude théorique de techniques expérimentales récemment développées pour réaliser des protocoles d’information quantique en variables continues. Les états Gaussiens multi-modes produits par conversion paramétrique de peignes de fréquences optiques jouent un rôle centrale dans ce travail. Ce phénomène permet de générer de façon déterministe un grand nombre d’états Gaussiens de la lumière. L’état de sortie peut ensuite être de-Gaussifié par soustraction ou addition d’un photon dans une superposition cohérente de modes du champ, puis mesuré par détection homodyne. La thèse est organisée en trois projets principaux. Le premier concerne l’optimisation du spectre du laser de pompe pour manipuler l’état de sortie de la conversion paramétrique. Nous avons développé les outils mathématiques pour traiter des profils spectraux avec amplitude et phase spectrales arbitraires. On a ensuite utilisé un algorithme d’optimisation pour trouver les spectres maximisant des différentes propriétés de l’état de sortie. Une importance particulière est donnée à la production d’"états cluster" en variables continues. Les optimisations ont été développées pour prendre en compte les limitations expérimentales pour assurer la faisabilité des forme spectrales dans les expériences. Dans le deuxième projet nous avons étudié comment les états non-Gaussiens obtenus par soustraction d’un photon d’un état comprimé peuvent être utilisés pour le calcul quantique. Nous proposons un protocole inspiré par le paradigme de "calcul quantique basé sur la mesure" qui combine l’état de-Gaussifié et la mesure homodyne pour approximer des opérateurs unitaires non-Gaussiens. On montre que les mêmes résultats peuvent être obtenus avec des mesure projectives sur des états de photon unique. Finalement, le troisième projet porte sur le partage de secret quantique ("quantum secret sharing"). Dans les protocoles de partage de secret quantique un donneur veut distribuer de l’information codée dans un système quantique à plusieurs joueurs d’une façon qui oblige des sous-ensembles de joueurs à collaborer s’ils veulent retrouver l’information originale. Nous avons développé un protocole qui peut être transféré aux expériences de notre groupe et nous avons participé à la formulation d’une preuve de concept expérimentale. À partir de cela, nous avons dérivé des résultats généraux sur le partage et la reconstruction d’états arbitraires de la lumière en utilisant des ressources GaussiennesThe present manuscript reports theoretical investigations about the use of recently developed experimental techniques in the realization of quantum information protocols with continuous variables. The focus of the work is on the multi-mode Gaussian states produced by spontaneous parametric down-conversion of optical frequency combs. Such setup allows to deterministicallyengineer many different Gaussian states of light. The output state can be de-Gaussified subtracting or adding a photon coherently on a superposition of modes and finally measured with pulse-shaped and wavelength-multiplexed homodyne detection. The thesis encompasses three projects. The first concerns the optimization of the spectrum of the pump laser field to engineer the Gaussian output state. We developed mathematical techniques to treat spectral profiles with arbitrary amplitude and spectral phase. We thenran an optimization algorithm to find the spectra maximizing several interesting properties of the state of the down-converted field. A particular emphasis was put on the production of continuous-variable cluster states. The optimizations were developed in such a way as to ensure the experimental feasibility of the optimized pump spectra. In the second project we studied how the non-Gaussian states produced subtracting a photon from a squeezed state can be used for quantum computation. We propose a protocol inspired by the measurement-based paradigm for quantum computation combining the photon subtracted states and homodyne detectionto approximate unitary non-Gaussian operations. We show that the same results can be obtained with projective measurements onsingle-photon states. Finally, the third project deals with quantum secret sharing. In quantum secret sharing schemes a dealer wants to share information encoded in some quantum system with a group of players in such a way that subsets of players need to collaborate if they want to retrieve the information. We devised a secret sharing protocol that could be mapped to the experimental setups developed in our group and participated in the formulation of an experimental proof of principle of such protocol. Starting from this we derived general results for sharing and reconstructing arbitrary quantum states using Gaussian resources
6
Wenger, Jérôme. "Dispositifs impulsionnels pour la communication quantique à variables continues." Phd thesis, Université Paris Sud - Paris XI, 2004. http://tel.archives-ouvertes.fr/tel-00006926.
Full textAbstract:
L'objectif central de cette thèse est d'exploiter les propriétés quantiques du champ électromagnétique pour développer de nouveaux dispositifs de communication. L'étude porte sur les composantes de quadrature (variables quantiques continues) d'un mode impulsionnel du champ lumineux. Une démonstration expérimentale de cryptographie quantique avec des états cohérents a été réalisée. Le dispositif se base sur des impulsions modulées en amplitude et en phase et comportant en moyenne une centaine de photons. Pour chaque impulsion lumineuse, une détection homodyne résolue en temps permet de mesurer une composante de quadrature particulière avec une forte efficacité. Une clé secrète a ainsi été transmise à un débit de 1.7 Mbits/s en l'absence de pertes et 75 kbits/s pour une transmission présentant des pertes de 3.1 dB, ce qui ouvre la voie pour des applications de cryptographie quantique à hauts débits. Afin d'étudier l'utilisation de spécificités quantiques, nous avons développé une source impulsionnelle d'états comprimés et d'états intriqués. Cette source utilise des conversions non-linéaires d'impulsions ultrabrèves intervenant dans un cristal mince de niobate de potassium. Suivant la configuration, la réduction du bruit en quadrature est de 2.7 dB sous le niveau de bruit quantique standard, ou les corrélations entre les quadratures des faisceaux intriqués sont de 2.5 dB. Grâce à ce dispositif, nous avons mis en oeuvre la première expérience de "dégaussification", pour transformer des impulsions de vide comprimé en des états non-gaussiens. Ce protocole est directement lié à la distillation de l'intrication de variables continues, qui permet d'améliorer la portée des dispositifs de cryptographie. Enfin, des schémas sont étudiés pour réaliser des tests complets des inégalités de Bell avec des variables continues mesurées par des détections homodynes.
7
Ketterer, Andreas. "Modular variables in quantum information." Thesis, Sorbonne Paris Cité, 2016. http://www.theses.fr/2016USPCC290/document.
Full textAbstract:
L’information quantique peut être traitée de deux manières fondamentalement différentes: à l’aide de variables discrètes ou continues. Dans cette thèse, nous étudions de manière théorique la réalisation de protocoles d’information quantique dans les systèmes caractérisés par des variables continues. Pour ce faire, nous utilisons les variables modulaires comme outil afin de révéler des structures discrètes dans les états, opérations et observables. Le présent travail est fortement motivé par l’applicabilité expérimentale de nos idées dans des expériences d’optique quantique. Le thème principal de cette thèse est la formulation d’un cadre pour le traitement quantique de l’information dans l’espace des phases grâce aux variables modulaires. L’usage des variables modulaires permet d’encoder des états logique dans des espaces de Hilbert de dimension infinie et de définir des opérations qui permettent de les manipuler. En particulier, nous considérons des protocoles qui impliquent des mesures de variables modulaires qui permettent la lecture d’information discrète codée dans des variables continues. Grâce à ce formalisme, nous montrons comment il est possible de réaliser des tests des propriétés fondamentales de la mécanique quantique comme l’intrication, la non-localité ou la contextualité dans des espaces de Hilbert de dimensions finie ou infinie. Ensuite, nous discutons pourquoi les degrés de liberté transverse des photons sont des candidats naturels pour l’implémentation expérimentale des variables modulaires. À cet effet, nous démontrons comment il est possible d’utiliser l’effet Talbot - un effet d’interférence de champ proche - afin d’encoder de l’information discrète dans la distribution spatiales des photons. Finalement, nous montrons pour la première fois comment produire des photons intriqués de dimension arbitraire de manière déterministe en utilisant la conversion paramétrique et des éléments d’optique linéaireQuantum information can be processed in two fundamentally different ways, using either discrete- or continuous-variable implementations. In this thesis we study theoretically how to implement discrete quantum information protocols in physical objects characterized by continuous variables. In order to do so we use modular variables as a helpful tool to reveal discrete structures in continuous-variable states, operations and observables. The present work is strongly guided by the experimental applicability of our ideas in quantum optics experiments, with a particular focus on the transverse degrees of freedom of single photons. One of the main themes of this thesis is the formulation of a framework for quantum information processing in phase-space based on the use of modular variables. The latter permit us to introduce logical states and operations allowing to manipulate discrete quantum information encoded in infinite dimensional Hilbert spaces. In particular, we consider protocols that involve measurements of judiciously chosen logical observables enabling the readout of the encoded discrete quantum information. Based on this framework we show how to perform tests of fundamental properties of quantum mechanics, such as entanglement, Bell nonlocality and contextuality, in Hilbert spaces of various dimensions. Further on, we discuss the transverse degrees of freedom of single photons as a natural platform to manipulate and measure modular variables. In particular, we demonstrate how to process discrete quantum information encoded in the spatial distribution of single photons via the optical Talbot effect - a near-field interference effect. Finally, we show for the first time how to produce deterministically d-dimensional entangled photon pairs using spontaneous parametric down-conversion and linear optical elements only
8
Leverrier, Anthony. "Etude théorique de la distribution quantique de clés à variables continues." Phd thesis, Télécom ParisTech, 2009. http://tel.archives-ouvertes.fr/tel-00451021.
Full textAbstract:
Cette thèse porte sur la distribution quantique de clés, qui est une primitive cryptographique permettant à deux correspondants éloignés, Alice et Bob, d'établir une clé secrète commune malgré la présence potentielle d'un espion. On s'intéresse notamment aux protocoles " à variables continues " où Alice et Bob encodent l'information dans l'espace des phases. L'intérêt majeur de ces protocoles est qu'ils sont faciles à mettre en œuvre car ils ne requièrent que des composants télécom standards. La sécurité de ces protocoles repose sur les lois de la physique quantique : acquérir de l'information sur les données échangées par Alice et Bob induit nécessairement un bruit qui révèle la présence de l'espion. Une étape particulièrement délicate pour les protocoles à variables continues est la " réconciliation " durant laquelle Alice et Bob utilisent leurs résultats de mesure classiques pour se mettre d'accord sur une chaîne de bits identiques. Nous proposons d'abord un algorithme de réconciliation optimal pour le protocole initial, puis introduisons un nouveau protocole qui résout automatiquement le problème de la réconciliation grâce à l'emploi d'une modulation discrète. Parce que les protocoles à variables continues sont formellement décrits dans un espace de Hilbert de dimension infinie, prouver leur sécurité pose des problèmes mathématiques originaux. Nous nous intéressons d'abord à des symétries spécifiques de ces protocoles dans l'espace des phases. Ces symétries permettent de simplifier considérablement l'analyse de sécurité. Enfin, nous étudions l'influence des effets de tailles finies, tels que l'estimation du canal quantique, sur les performances des protocoles.
9
Leverrier, Anthony. "Etude théorique de la distribution quantique de clés à variables continues." Phd thesis, Paris, Télécom ParisTech, 2009. https://theses.hal.science/tel-00451021.
Full textAbstract:
Cette thèse porte sur la distribution quantique de clés, qui est une primitive cryptographique qui permet à deux correspondants éloignés, Alice et Bob, d'établir une clé secrète commune malgré la présence potentielle d'un espion. On s'intéresse notamment aux protocoles « à variables continues »' où Alice et Bob encodent l'information dans l'espace des phases. L'intérêt majeur de ces protocoles est qu'ils sont faciles à mettre en œuvre car ils ne requièrent que des composants télécom standards. La sécurité de ces protocoles repose sur les lois de la physique quantique : acquérir de l'information sur les données échangées par Alice et Bob induit nécessairement un bruit qui révèle la présence de l'espion. Une étape particulièrement délicate pour les protocoles à variables continues est la « réconciliation » durant laquelle Alice et Bob utilisent leurs résultats de mesure classiques pour se mettre d'accord sur une chaîne de bits identiques. Nous proposons d'abord un algorithme de réconciliation optimal pour le protocole initial, puis introduisons un nouveau protocole qui résout automatiquement le problème de la réconciliation grâce à l'emploi d'une modulation discrète. Parce que les protocoles à variables continues sont formellement décrits dans un espace de Hilbert de dimension infinie, prouver leur sécurité pose des problèmes mathématiques originaux. Nous nous intéressons d'abord à des symétries spécifiques de ces protocoles dans l'espace des phases. Ces symétries permettent de simplifier considérablement l'analyse de sécurité. Enfin, nous étudions l'influence des effets de tailles finies, tels que l'estimation du canal quantique, sur les performances des protocolesThis thesis is concerned with quantum key distribution (QKD), a cryptographic primitive allowing two distant parties, Alice and Bob, to establish a secret key, in spite of the presence of a potential eavesdropper, Eve. Here, we focus on continuous-variable protocols, for which the information is coded in phase-space. The main advantage of these protocols is that their implementation only requires standard telecom components. The security of QKD lies on the laws of quantum physics: an eavesdropper will necessary induce some noise on the communication, therefore revealing her presence. A particularly difficult step of continuous-variable QKD protocols is the ``reconciliation'' where Alice and Bob use their classical measurement results to agree on a common bit string. We first develop an optimal reconciliation algorithm for the initial protocol, then introduce a new protocol for which the reconciliation problem is automatically taken care of thanks to a discrete modulation. Proving the security of continuous-variable QKD protocols is a challenging problem because these protocols are formally described in an infinite dimensional Hilbert space. A solution is to use all available symmetries of the protocols. In particular, we introduce and study a class of symmetries in phase space, which is particularly relevant for continuous-variable QKD. Finally, we consider finite size effects for these protocols. We especially analyse the influence of parameter estimation on the performance of continuous-variable QDK protocols
10
Fabre, Nicolas. "Quantum information in time-frequency continuous variables." Thesis, Université de Paris (2019-....), 2020. http://www.theses.fr/2020UNIP7044.
Full textAbstract:
Cette thèse aborde l’encodage de degrés de liberté continus temps-fréquence de photon uniques. Les similitudes mathématiques avec les quadratures du champ électromagnétique amène à généraliser des protocoles exprimées dans ces variables dans notre encodage. On introduit un nouveau type de qubit robuste contre des erreurs du type déplacement dans l’espace des phases temps-fréquence. Un nouvel espace des phases doublement cylindriques est étudié et est une représentation particulièrement adaptée pour des états ayant une symétrie de translation. On étudie également comment construire une distribution de phase fonctionnelle permettant de décrire un état quantique possédant des degrés de libertés continus spectraux et en quadratureThis thesis tackles the time-frequency continuous variables degree of freedom encoding of single photons and examine the formal mathematical analogy with the quadrature continuous variables of the electromagnetic field. We define a new type of qubit which is robust against time-frequency displacement errors. We define a new double-cylinder phase space which is particularly adapted for states which have a translational symmetry. We also study how to build a functional phase space distribution which allows to describe a quantum state with spectral and quadrature continuous variables degrees of freedom
Books on the topic "Information quantique en variables continues"
1
(Editor), N. J. Cerf, G. Leuchs (Editor), and E. S. Polzik (Editor), eds. Quantum Information With Continuous Variables of Atoms and Light. Imperial College Press, 2007.
Find full text
2
(Editor), N. J. Cerf, G. Leuchs (Editor), and E. S. Polzik (Editor), eds. Quantum Information With Continuous Variables of Atoms and Light. Imperial College Press, 2007.
Find full textBook chapters on the topic "Information quantique en variables continues"
1
Ewert, Alan W., Denise S. Mitten, and Jillisa R. Overholt. "Natural landscapes and human health: an introduction and overview." In Health and natural landscapes: concepts and applications, 1–9. Wallingford: CABI, 2021. http://dx.doi.org/10.1079/9781789245400.0001.
Full textAbstract:
Abstract This book chapter approaches the linkage between natural landscapes and human health through the lens of two guiding questions, the first considering the various ways nature benefits human health from both historic and contemporary perspectives, and the second considering the mechanisms through which this relationship occurs. In doing so, we consider the ways societies and cultures have mediated our relationship with the natural world over time, and the ways human health and planetary health are intertwined. It also examines these influences by providing an overview of what is currently known about specific variables, such as physical activity in natural landscapes, as well as discussing some of the past and current theories that seek to explain how these connections actually work. The book provides a bridge between what we do (individually and collectively) in natural settings and how those actions impact our health and our relationships with the natural world. The hope is that the information presented here empowers students and professionals to learn more and to be part of the rich dialogue occurring in many disciplines to help find ways to increase well-being for all people. The aim is for the readers to think critically about research and be able to analyse and evaluate the results. The bottom line, based on the undertaking of this book and the experience of the authors, is that nature has been and continues to be essential and incredibly positive for human life, and that mutualistic and reciprocal connections with nature will positively influence human development, health, and wellbeing.
2
Currell, Graham. "Multiple variables." In Scientific Data Analysis. Oxford University Press, 2015. http://dx.doi.org/10.1093/hesc/9780198712541.003.00011.
Full textAbstract:
This chapter explores situations in which the investigation produces several measured variables. As the ability to measure and record multiple variables with greater ease and accuracy continues to increase, we are being faced with very large data sets from which we wish to draw out hidden information. A general type of approach is to investigate whether different groups of variables provide related information and then whether it is possible to represent the actions of many variables with a small number of composite variables. The chapter then develops techniques of data reduction through principal component analysis, and data modelling through cluster analysis and multiple regression. It also takes the example of questionnaire data, which could also represent multiple experimental measurements, and identifies a wide range of possible analytical techniques, together with specific references to analyses developed previously.
3
Ngafeeson, Madison N. "User Resistance to Health Information Technology." In Advanced Methodologies and Technologies in Medicine and Healthcare, 276–87. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-7489-7.ch022.
Full textAbstract:
The use of information technology (IT) in healthcare to improve outcomes is now a global phenomenon. If effectively implemented and efficiently leveraged, these technologies will greatly lower healthcare costs, improve safety, and elevate the quality of health. Nevertheless, health IT implementation and adoption continues to meet challenges. Reports show that physicians, nurses, and other healthcare professionals continue to resist health IT. Researchers have proposed models to explain this notion, and till date, there still is a lack of an overarching paradigm to view the concept. Resistance is a complex phenomenon that defies simple explanation and analysis. It requires well-accepted theories or paradigms encompassing the full range of variables associated with it. Understanding and mitigating user resistance is a great step toward improving sector-wide adoption. In this chapter, the authors survey extant theories of resistance and provide a paradigmatic lens for leveraging this knowledge to practical solutions in health IT adoption.
4
"Information Technology Needs for Public Service Delivery in the Digital Era." In Information Systems Strategic Planning for Public Service Delivery in the Digital Era, 227–68. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-9647-9.ch009.
Full textAbstract:
This chapter continues the path through the ISSP framework by considering the IT needs of government entities. The chapter discusses the evolution of eGovernment and mGovernment and presents research findings regarding the website evaluation of 40 countries using the Inland Revenue and Social Security governmental websites as the research basis. The website evaluation utilized an instrument developed by Cumbrowski that consists of eight dimensions. The research also examined the relationship between these website ratings and other variables extracted from reports provided by the International Telecommunication Union, World Economic Forum, and United Nations Development Programme. The chapter also examines the trends that are at the forefront of IT developments. The chapter concludes by applying various models to show how a government entity may determine its IT needs. The above are discussed in the context of how to improve public service delivery in the digital era, with numerous examples to support this discussion.
5
Panina, Daria. "Electronic Monitoring in the Workplace." In Encyclopedia of Human Resources Information Systems, 314–20. IGI Global, 2009. http://dx.doi.org/10.4018/978-1-59904-883-3.ch047.
Full textAbstract:
Recent advances in technology have led to the rapid development of electronic monitoring in the workplace (Chen & Ross, 2007). Electronic monitoring is widely used in many industries, and there is no doubt that the size of the workforce subjected to it continues to grow (American Management Association, 2005; D’Urso, 2006). It is used by organizations due to its potential to optimize supervision and control processes, protect company assets, safeguard property information, and avoid costly litigation (Case & Young, 2002; Friedman & Reed, 2007). Electronic monitoring can become a central organizational tool for human resource management as well. It can have a profound impact on several HR functions. For example, an electronic monitoring system may be used as a source of data for performance management and performance evaluation and provide the basis for promotion, training, and development decisions (Wells, Moornan, & Werner, 2007). Due to these capabilities, electronic monitoring affects an array of work-related attitudes and behaviors of employees and management (Stanton, 2000b). Existing research is focusing on identifying the ways to make electronic monitoring acceptable to all stakeholders, by elucidating electronic monitoring designs that help maintain the motivation and well-being of individuals. However, we are only beginning to address the issue of the effects of organizational culture and human resource strategy on the role of electronic monitoring and its effectiveness within specific organizational contexts (Chen & Ross, 2005). These contextual factors may determine the role that electronic monitoring plays in managing human resources, from being one of the technology-enhanced human resource management practices devolved to line managers, to being a central part of the overall human resource strategy that supports various HR functions within an organization. The purpose of this article is to present a model of electronic monitoring effectiveness that combines the major electronic monitoring characteristics, their individual and organizational outcomes, and contextual variables that affect electronic monitoring acceptance and use.
6
Davenport, Christian, and Benjamin J. Appel. "Studying Spells: A New Unit of Analysis, Measure, and Model." In The Death and Life of State Repression, 40–66. Oxford University PressNew York, 2022. http://dx.doi.org/10.1093/oso/9780197655375.003.0003.
Full textAbstract:
Abstract Chapter 2 introduces our new measure of repressive spells which we defined as the duration of time government behavior existed above a certain threshold (i.e., a particular level of severity and size of the targeted population). When repression moves above this threshold, a spell begins. As long as repressive action stays above this level, it continues. Once repression falls below the designated level, the spell terminates. And, if, after having gone through a spell already, repressive behavior once again rises above the designated threshold, it is said to recur. Throughout the chapter we provide overviews of what the specific spell component look life. Chapter 2 also provides information about the diverse variables/policies that are employed in the world to reduce/stop repression and examined in empirical models. The chapter concludes with a description of our analytic strategy.
7
Müller, Ralf, Nathalie Drouin, and Shankar Sankaran. "A Theory of Balanced Leadership." In Balanced Leadership, 25–47. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780190076122.003.0003.
Full textAbstract:
This chapter describes balanced leadership theory. It starts by discussing the need for theories for good practical work. A positioning follows, which locates balanced leadership as a middle-range theory between substantive and grand theories. The chapter continues with some of the required information to make sense of the theory. This includes the philosophical stance, which is critical realism, and the theoretical lens, which is realist social theory and its morphogenetic cycle. A detailed description of the theory follows. This description addresses the theory’s constituting variables (the what), the macro- and micro-processes that explain the flow of activities (the how), the internal functioning and its relation to contingency theory (the why), and finally, the limitations and areas of application where the theory holds (the where/when/who). Various cross-references are made to the subsequent chapters in this book.
8
Rochester, Ramonia R. "Multiliteracies Pedagogy." In Handbook of Research on Education and Technology in a Changing Society, 1005–13. IGI Global, 2014. http://dx.doi.org/10.4018/978-1-4666-6046-5.ch075.
Full textAbstract:
The converging global environment has given rise to a social-constructivist approach to new literacy pedagogical and learning practices. Emergent digital and social spaces have created new literacy or multiliteracies. Support for multiliteracies is an inherently social construct which encapsulates human capital and Information Communications Technology (ICT), including technical and administrative infrastructure, policy and school culture, and teacher training and collaborative support. Several variables intervene in the pedagogical landscape in support of new literacy development in adolescent learners. Students become both producers and transmitters of multiliteracies through transformed practice and by forming social and professional identities, facilitated through authentic learning experiences. ICT is both a literacy as well as the media which support 21st century new literacy development. As socio-economic factors determine the availability and use of technology in the classroom, the hegemonic use of print and the inability to access “digital geographies” creates a digital divide. As literacy pedagogy continues to unfold, creative instruction must be employed in ensuring the development of multiliteracies through providing scaffolding, critical framing, and authentic learning experiences for students and teachers alike. This is explored in this chapter.
9
Li, Eldon Y., and Shu-Hsun Chang. "User Intention of Sharing Video Clips on Web 2.0 Social Network Websites." In Organizations and Social Networking, 153–73. IGI Global, 2013. http://dx.doi.org/10.4018/978-1-4666-4026-9.ch008.
Full textAbstract:
As the advance of Internet technology continues, various applications, services, and business models are emerging in the market. The online video sharing website is the hottest application nowadays; thus it is important to understand the key factors influencing user’s behavior on these websites. In this chapter, the authors propose a conceptual model which is based on the integrated model of user satisfaction and technology acceptance developed by Wixom and Todd (2005). To comprehend the user’s behavior intention toward using the website, the authors also add the potential factors about community which influence user’s behavior on video sharing websites. The results indicate that community satisfaction, content satisfaction, and system satisfaction all have significant positive impact on usefulness and ease of use, and that community satisfaction has a much higher impact than the other two types of satisfaction. This finding reveals an important attribute of video sharing websites, namely, the users of the website care most about the entire website community. Indeed, reliable system operations and useful, interactive content are two factors influencing the community satisfaction. For designers who want to set up a video sharing website, this research provides more comprehensive information on how to invest the limited resources on the critical variables in order to maximize the service value.
10
Chebi, Hocine. "Scalable Data Analysis Application to Web Usage Data." In Multimedia and Sensory Input for Augmented, Mixed, and Virtual Reality, 261–74. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-4703-8.ch014.
Full textAbstract:
The number of hits to web pages continues to grow. The web has become one of the most popular platforms for disseminating and retrieving information. Consequently, many website operators are encouraged to analyze the use of their sites in order to improve their response to the expectations of internet users. However, the way a website is visited can change depending on a variety of factors. Usage models must therefore be continuously updated in order to accurately reflect visitor behavior. This remains difficult when the time dimension is neglected or simply introduced as an additional numeric attribute in the description of the data. Data mining is defined as the application of data analysis and discovery algorithms on large databases with the goal of discovering non-trivial models. Several algorithms have been proposed in order to formalize the new models discovered, to build more efficient models, to process new types of data, and to measure the differences between the data sets. However, the most traditional algorithms of data mining assume that the models are static and do not take into account the possible evolution of these models over time. These considerations have motivated significant efforts in the analysis of temporal data as well as the adaptation of static data mining methods to data that evolves over time. The review of the main aspects of data mining dealt with in this thesis constitutes the body of this chapter, followed by a state of the art of current work in this field as well as a discussion of the major issues that exist there. Interest in temporal databases has increased considerably in recent years, for example in the fields of finance, telecommunications, surveillance, etc. A growing number of prototypes and systems are being implemented to take into account the time dimension of data explicitly, for example to study the variability over time of analysis results. To model an application, it is necessary to choose a common language, precise and known by all members of a team. UML (unified modeling language, in English, or unified modeling language, in French) is an object-oriented modeling language standardized by the OMG. This chapter aims to present the modeling with the diagrams of packages and classes built using UML. This chapter presents the conceptual model of the data, and finally, the authors specify the SQL queries used for the extraction of descriptive statistical variables of the navigations from a warehouse containing the preprocessed usage data.
Conference papers on the topic "Information quantique en variables continues"
1
Coatane´a, Eric, Tuomas Ritola, Irem Y. Tumer, and David Jensen. "A Framework for Building Behavioral Models for Design-Stage Failure Identification Using Dimensional Analysis." In ASME 2010 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/detc2010-28864.
Full textAbstract:
In this paper, a design-stage failure identification framework is proposed using a modeling and simulation approach based on Dimensional Analysis and qualitative physics. The proposed framework is intended to provide a new approach to model the behavior in the Functional-Failure Identification and Propagation (FFIP) framework, which estimates potential faults and their propagation paths under critical event scenarios. The initial FFIP framework is based on combining hierarchical system models of functionality and configuration, with behavioral simulation and qualitative reasoning. This paper proposes to develop a behavioral model derived from information available at the configuration level. Specifically, the new behavioral model uses design variables, which are associated with units and quantities (i.e., Mass, Length, Time, etc…). The proposed framework continues the work to allow the analysis of functional failures and fault propagation at a highly abstract system concept level before any potentially high-cost design commitments are made. The main contribution in this paper consists of developing component behavioral models based on the combination of fundamental design variables used to describe components and their units or quantities, more precisely describing components’ behavior.
2
Nagarajan, Hari P. N., Hesam Jafarian, Azarakhsh Hamedi, Hossein Mokhtarian, Romaric Prod'hon, Shaima Tilouche, Eric Coatanéa, and Vladislav Nenchev. "Knowledge-Based Optimization of Artificial Neural Network Topology for Process Modeling of Fused Deposition Modeling." In ASME 2018 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/detc2018-86187.
Full textAbstract:
Additive manufacturing (AM) continues to rise in popularity due to its various advantages over traditional manufacturing processes. AM interests industry, but achieving repeatable production quality remains problematic for many AM technologies. Thus, modeling the influence of process variables on the production quality in AM can be highly beneficial in creating useful knowledge of the process and product. An approach combining dimensional analysis conceptual modeling, mutual information based analysis, experimental sampling, factors selection, and modeling based on Knowledge-Based Artificial Neural Network (KB-ANN) is proposed for Fused Deposition Modeling (FDM) process. KB-ANN reduces the excessive amount of training samples required in traditional neural networks. The developed KB-ANN’s topology for FDM, integrates existing literature and expert knowledge of the process. The KB-ANN is compared to conventional ANN using prescribed performance metrics. This research presents a methodology to concurrently perform experiments, classify influential factors, limit the effect of noise in the modeled system, and model using KB-ANN. This research can contribute to the qualification efforts of AM technologies.
3
Strömberg, Niclas. "Reliability Based Design Optimization by Using a SLP Approach and Radial Basis Function Networks." In ASME 2016 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/detc2016-59522.
Full textAbstract:
In this paper reliability based design optimization by using radial basis function networks (RBFN) as surrogate models is presented. The RBFN are treated as regression models. By taking the center points equal to the sampling points an interpolation is obtained. The bias of the network is taken to be known a priori or posteriori. In the latter case, the well-known orthogonality constraint between the weights of the RBFN and the polynomial basis functions of the bias is adopted. The optimization is performed by using a first order reliability method (FORM)-based sequential linear programming (SLP) approach, where the Taylor expansions are generated in intermediate variables defined by the iso-probabilistic transformation. In addition, the reliability constraints are expanded at the most probable points which are found by using Newton’s method. The Newton algorithm is derived by proposing an in-exact Jacobian. In such manner, a FORM-based LP-formulation in the standard normal space of problems with non-Gaussian variables is suggested. The solution from the LP-problem is mapped back to the physical space and the suggested procedure continues in a sequence until convergence is reached. This is implemented for five different distributions: normal, lognormal, Gumbel, gamma and Weibull. It is also presented how the FORM-based SLP approach can be corrected by using second order reliability methods (SORM) and Monte Carlo simulations. In particular, the SORM approach of Hohenbichler is studied. The outlined methodology is both efficient and robust. This is demonstrated by solving established benchmarks as well as finite element problems.
4
Purnamasari, Endah Dewi, Try Wulandari, Leriza Desitama Anggraini, and Fani Kristina. "THE IMPLEMENTATION OF INFORMATION TECHNOLOGY ON INCREASING MSMEs INCOME." In Global Conference on Business and Management Proceedings. Goodwood Conferences, 2022. http://dx.doi.org/10.35912/gcbm.v1i1.6.
Full textAbstract:
Information technology makes it easier for humans to carry out various activities, including producing, processing, and disseminating information. Information technology that continues to develop brings big changes for MSMEs in which the existence of MSMEs is believed to make a substantial contribution to the economy in Indonesia. In its development, MSMEs experience many challenges to maintain their business continuity. The application of information technology is believed to help MSMEs increase their income and maintain MSME business continuity. This study aims to find out how the application of information technology can increase the income of MSMEs. This study used primary data, namely data obtained from the source directly through a questionnaire/questionnaire. The results showed that the application of information technology had a positive impact on increasing MSME income. The sign value showed 0.000 < 0.05. The conclusion was that H1 is accepted, meaning that the application of information technology affected the income of MSMEs in Seberang Ulu 1 Palembang District. MSMEs that have used information technology could increase their income by 15% -25% per month, which was a new advantage for MSME actors. Applying information technology to MSMEs has proven to help MSMEs survive amid the Covid-19 pandemic, which weakens the business world. With this information technology, MSMEs can bounce back and meet customer needs. Constraints in this research are time and the object of research. This research can be used as further research in the future by adding some relevant variables.
5
Saade, Raafat, Dennis Kira, Fassil Nebebe, and Camille Otrakji. "Openness to Experience: An HCI Experiment." In InSITE 2006: Informing Science + IT Education Conference. Informing Science Institute, 2006. http://dx.doi.org/10.28945/2944.
Full textAbstract:
Today’s market continues to introduce many and different information communications technologies. As a result, end users are faced with a variety of interfaces which they need to learn and use in a short period of time. The motivation to learn a new interface is subject to many variables most importantly is level of computer competencies, and openness to experience. The aim of this study was to explore end-users’ overall computer competencies, competencies using software with graphical interfaces and openness to experiencing new software interfaces. In a controlled experiment, participants were asked to perform five tasks using an image editing icon based interface software for the first time. We identify possible personality trait construct in modeling better interfaces.
6
Kritzer, Jake, Katy Bland, Tom Shyka, and Jackie Motyka. "Designing A Data Buoy Network To Support Offshore Wind Energy Development In Southern New England." In Offshore Technology Conference. OTC, 2023. http://dx.doi.org/10.4043/32273-ms.
Full textAbstract:
Abstract Capitalizing on the considerable economic value and climate change mitigation benefits of offshore wind energy (OSW) while minimizing and mitigating its impacts on other ocean users and the marine environment requires a robust foundation of information. The Massachusetts/Rhode Island Wind Energy Area (MA/RI WEA) on the Southern New England Shelf is the first site of industrial-scale OSW development in the United States, and therefore where these challenges are first being confronted. Several sustained ocean observing buoys in the region provide valuable information for mariners, policymakers, and scientists, but additional data streams are needed in light of the forthcoming changes in use of the ocean. Therefore, we are investigating end-user data needs related to OSW development to inform the working design of a purpose-built buoy network structured around five priority issues: Navigation Safety, Marine Pollution, Fisheries Management, Wildlife Conservation, and Climate Tracking. Network design attributes sought by users include high-density measurements of the most important variables likely to be affected by turbines within the WEA while streamlining installation of additional infrastructure to the extent possible, a trade-off that calls for optimization analyses. Users also stressed the need to expand coverage of the shelf ecosystem given the bidirectional oceanographic, ecological, and economic interactions between the WEA and surrounding areas. We therefore identify an initial set of nine priority locations for ecosystem-scale observations. Observing in nearshore areas will be particularly important given the prevalence of vessel traffic, sensitive habitats, and human use close to shore. Priority measurements included a modest set of variables that characterize sea state conditions and weather to support Navigation Safety, along with a broader suite of ecosystem variables measured throughout the water column to inform other issues. As our research continues the working design will evolve, with the process ultimately aiming to provide lessons and precedent for how to build a robust information base for OSW development across the nation.
7
Lee, Jeehwan, and Sanghyun Lee. "IEQ Visual Data to Building Occupants for Personal Control of Indoor Environmental Quality." In AHFE 2023 Hawaii Edition. AHFE International, 2023. http://dx.doi.org/10.54941/ahfe1004248.
Full textAbstract:
Indoor Environmental Quality (IEQ) profoundly influences occupants' health, productivity, and comfort in built environments. Effective interaction with occupants to comprehend and control IEQ conditions is crucial in human-centered design for IEQ optimization. This paper presents a preliminary study that leverages three-dimensional (3D) virtual space to deliver IEQ data to occupants, enabling them to understand indoor conditions better and exercise personal control of IEQ. A survey was conducted with participants in a virtually simulated educational environment. For a comparative study, participants experienced 3D virtual space with and without IEQ data information on IEQ variables such as temperature, humidity, air quality, lighting, and noise levels. The proposed framework addresses the effectiveness of IEQ visual data on occupants' responses to ways of indoor environmental controls. Regarding the effectiveness of IEQ visual data for occupants' engagement in IEQ controls, the percentage of positive tendency, that responses strongly agree and agree, ranges from 86 to 88% for thermal comfort, from 84 to 92% for visual comfort, from 71 to 81% for acoustic comfort, and 85% for indoor air quality. Findings also show that specific directions on pictograms would help participants take active engagement to improve comfort levels rather than visual data solely. In conclusion, this paper indicates a preliminary approach utilizing 3D virtual space to determine how participants respond to IEQ visual data for personal control of IEQ. By merging immersive visualization with interactive control, our framework bridges human factors and indoor design for occupants' comfort and productivity. The demand for human-centered design continues to expand to IEQ management with emerging technologies such as electroencephalography, resulting in the design of optimized, healthier, productive, and energy-efficient indoor spaces.
8
Rizzo Cascio, Joseph, Antonio Da Silva, Martino Ghetti, Martino Corti, and Marco Montini. "Proxy Model for Real-Time Estimation of Cool Down Time of Subsea Production System to Prevent Hydrates Formation." In International Petroleum Technology Conference. IPTC, 2021. http://dx.doi.org/10.2523/iptc-21489-ms.
Full textAbstract:
Abstract Objectives/Scope The benefits of real-time estimation of the cool down time of Subsea Production System (SPS) to prevent formation of hydrates are shown on a real oil and gas facility. The innovative tool developed is based on an integrated approach, which embeds a proxy model of SPS and hydrate curves, exploiting real-time field data from the Eni Digital Oil Field (eDOF, an OSIsoft PI based application developed and managed by Eni) to continuously estimate the cool down time before hydrates are formed during the shutdown. Methods, Procedures, Process The Asset value optimization and the Asset integrity of hydrocarbon production systems are complex and multi-disciplinary tasks in the oil and gas industry, due to the high number of variables and their synergy. An accurate physical model of SPS is built and, then, used to develop a proxy model, which integrates hydrate curves at different MeOH concentration, being able to estimate in real time the cool down time of SPS during the shutdown exploiting data from subsea transmitters made available by eDOF in order to prevent formation of hydrates. The tool is also integrated with a user-friendly interface, making all relevant information readily available to the operators on field. Results, Observations, Conclusions The integrated approach provides a continues estimation of cool down time based on real time field data (eDOF) in order to prevent formation of hydrates and activate preservation actions. An accurate physical model of SPS is built on a real business case using Olga software and cool down curves simulated considering different operating shutdown scenarios. Hydrate curves of the considered production fluid are also simulated at different MeOH concentration using PVTsim NOVA software. Off-line simulated curves are then implemented as numerical tables combined with eDOF data by an Eni developed fast executing proxy model to produce estimated cool down time before hydrates are formed. A graphic representation of SPS behavior and its cool down time estimation during shutdown are displayed and ready to use by the operators on field in support of the operations, saving cost and time. Novel/Additive Information The benefits of real time estimation of the cool down time of SPS to prevent hydrates formation are shown in terms of saving of time and cost during the shutdown operations on a real case application. This integrated approach allows to rely on a continue, automatic and acceptably accurate estimate of the available time before hydrates are formed in SPS, including the possibility to be further developed for cases where subsea transmitters are not available or extended to other flow assurance issues.
9
Johnson, Samuel E., Jaclyn E. Nesbitt, and Jeffrey D. Naber. "Mass and Momentum Flux Measurements With a High Pressure Common Rail Diesel Fuel Injector." In ASME 2010 Internal Combustion Engine Division Fall Technical Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/icef2010-35171.
Full textAbstract:
The combined optimization of diesel engine power, fuel consumption, and emissions output significantly drives the development and tuning of engines. One leading subsystem that continues to receive major development and advancement is the fuel system. High pressure common rail systems lead fuel injection technology and utilize both solenoid and piezoelectric actuated injectors with a wide range of pressure and injection scheduling control. To optimize engine operation the fuel system’s capability is implemented through complex fuel scheduling coupled with charge preparation. With the number of parameters to control, fuel delivery (including dynamic flow characteristics) is one that must be well understood. Most rate of injection systems provide mass flow rate; however, studies have shown that momentum flux is a critical parameter controlling spray entrainment and penetration. To obtain the mass flow rate and momentum flux for a high pressure common rail diesel fuel injector, a rate of injection meter was designed, constructed, and tested allowing for the dynamic measurement of fuel injection with the capability of in-situ operation in a combustion vessel. Measurements were obtained by recording the force signal from a fuel spray jet impinging on the anvil of a force transducer. Combining the force signal with a measure of cumulative injected mass enables calculation of mass and momentum dynamics. The injection system consisted of a Bosch Generation 2 CRIP 2.2 solenoid controlled fuel injector with a single hole 0.129 mm diameter injector nozzle, driven by a custom programmable injector driver from Southwest Research Institute. Testing control variables were injection pressure and injection duration while using #2 ULSD fuel. Initial results showed high repeatability with a COV of less than 1.1 percent for all injection parameters with an average Cd of 0.92 and Ca of 0.97 for a mean injection pressure of 852 bar. A six point injection pressure sweep from 1000 to 1810 bar showed a 1.74 mg/ms overall increase in injection rate and a 0.16 ms overall decrease in fuel discharge duration. A six point injection duration sweep from 0.25 ms to 1.50 ms showed a 3.36 mg/ms total injection rate increase and a 0.68 ms overall increase in fuel discharge time while maintaining a consistent start-of-injection delay. The results show that this injection rate apparatus provides needed information on injection characteristics to assist engine manufacturers with achieving goals of high power with minimal emissions. Furthermore, it has been shown that this system is versatile for future injector characterizations over a wide range of pressures and durations, along with fuel type and injector parameters including nozzle hole diameter.