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Добірка наукової літератури з теми "DCT TECHNIQUE"

Автор: Grafiati
Опубліковано: 11 вересня 2023

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Статті в журналах з теми "DCT TECHNIQUE"

1

Behl, Nipun, and Shivangi Katiyar. "Diagonally Assisted DCT Technique for Face Recognition: DA-DCT." International Journal of Computer Applications 141, no. 11 (May 17, 2016): 11–15. http://dx.doi.org/10.5120/ijca2016909848.

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2

Baithoon, Nushwan Yousif. "Zeros Removal with DCT Image Compression Technique." Journal of Kufa for Mathematics and Computer 1, no. 3 (May 30, 2011): 38–46. http://dx.doi.org/10.31642/jokmc/2018/010305.

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Анотація:
The discrete cosine transform (DCT) is a method for converting a signal into plain frequency components. It is extensively used in image compression. In this paper a new technique is proposed, namely ZRDCT (Zeros Removal with DCT) which is based on a lossy compression, and used to enhance image data compression.Image quality is measured impartially, using peak signal-to-noise ratio (PSNR) or picture quality scale, and individually using perceived image quality with compression factor (CF) being the main theme of this paper, taking into consideration the preservation of well PSNR outputs. The performance of DCT compression generally degrades low bit-rates mainly because of the underlying block-based DCT scheme. Experimental results demonstrated the effectiveness of the ZRDCT approach, which enhanced the performance of the conventional DCT image compression methods, by investigating and interrogating the whole image and hence enforcing mechanisms for finding possible redundant information and therefore the removal of unnecessary data which lead to an improvement in CF without upsetting PSNR.The new technique also proved to have low distortions with good quality PSNR, commendable CF and good execution time, when compared to other various DCT schemes and with some wavelet based image compression
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3

Bansal, Deepika, and Rita Chhikara. "An Improved DCT based Steganography Technique." International Journal of Computer Applications 102, no. 14 (September 18, 2014): 46–49. http://dx.doi.org/10.5120/17887-8861.

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4

said, Shaimaa A. El. "Efficient DCT-based image compression technique." International Journal of Signal and Imaging Systems Engineering 6, no. 4 (2013): 259. http://dx.doi.org/10.1504/ijsise.2013.056637.

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5

Saraiva, Aratã Andrade, Felipe Castro, Marcos Soares de Oliveira, and José Vigno Moura Sousa. "Identification of exonic regions in dna sequences an approach using cross-correlation and noise suppression by discrete cosine transform." Research, Society and Development 9, no. 9 (September 11, 2020): e883998173. http://dx.doi.org/10.33448/rsd-v9i9.8173.

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Анотація:
To identify the exonic regions in the DNA sequence of Chromosome 23, filtering techniques are used. DCT is a technique with the ability to remove noise from signals as shown in [Saraiva et al., 2018], in addition, noise suppression with DCT is not enough in itself, so in this work a new method of identifying exonic regions using cross correlation with DCT together with an FFT-based bandpass filter to decrease signal noise and find exonic regions.
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6

RENDRAGRAHA, RENDY DWI, GELAR BUDIMAN, and IRMA SAFITRI. "QIM - Based Audio Watermarking with Combination Technique of DCT-QR-CPT." ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika 7, no. 1 (January 24, 2019): 112. http://dx.doi.org/10.26760/elkomika.v7i1.112.

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Анотація:
ABSTRAKAudio watermarking adalah teknik memasukkan informasi ke dalam file audio dan untuk melindungi hak cipta data digital dari distribusi ilegal. Makalah ini memperkenalkan audio stereo watermarking berdasarkan Quantization Index Modulation (QIM) dengan teknik gabungan Discrete Cosine Transform (DCT) - QRCartesian Polar Transform (CPT). Host audio dibagi menjadi beberapa frame, selanjutnya setiap frame ditransformasi oleh DCT, kemudian output DCT diuraikan menjadi matriks orthogonal dan matriks segitiga menggunakan metode QR. Selanjutnya, CPT mengubah dua koefisien kartesian dari matriks segitiga (R) pada posisi (1,1) dan (2,2) menjadi koefisien polar. Setelah itu, penyisipan dilakukan pada koefisien polar oleh QIM. Hasil simulasi menunjukkan bahwa imperseptibilitas audio terwatermark berkualitas baik dengan Signal to Noise Ratio (SNR)> 20, Mean Opinion Score (MOS)> 4 dan tahan terhadap serangan seperti Low Pass Filter (LPF) dan Band Pass Filter (BPF) dengan cut off 25-6k, resampling, Linear Speed Change (LSC) dan MP3 Compression dengan rate diatas 64 kbps.Kata kunci: Audio Watermarking, CPT, DCT, QIM, QR ABSTRACTAudio watermarking is a technique for inserting information into an audio file and to protect the copyright of digital data from illegal distribution. This paper introduces a stereo audio watermarking based on Quantization Index Modulation (QIM) with combined technique Discrete Cosine Transform (DCT) – QR – Cartesian Polar Transform (CPT). Each frame of a host audio is transformed by DCT, then DCT output is decomposed using QR method. Next, CPT transform two cartesian coefficients from triangular matrix (R) in position (1,1) and (2,2) to polar coefficients. After that, embedding is executed on polar coefficients by QIM. The simulation result shows that the imperceptibility is good with Signal to Noise Ratio (SNR)>20, Mean Opinion Score (MOS)>4 and it is robust against attacks such as Low Pass Filter (LPF) and Band Pass Filter (BPF) with cut off 25-6k, Resampling, Linear Speed Change and MP3 Compression with rate 64 kbps and above. Keywords: Audio Watermarking, CPT, DCT, QIM, QR
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7

Kaur, Randeep, and Kamaljit Kaur Dhillon. "GRAYSCALE IMAGE WATERMARK DETECTION." INTERNATIONAL JOURNAL OF COMPUTERS & TECHNOLOGY 3, no. 1 (August 1, 2012): 100–105. http://dx.doi.org/10.24297/ijct.v3i1b.2748.

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Анотація:
A Digital watermarking is a technique that provides a solution to the longstanding problems faced with copyrighting digital data. Digital watermarks are pieces of information added to digital data (audio, video, or still images) that can be detected or extracted later to make an assertion about the data. This information can be textual data about the author, its copyright, etc; or it can be an image itself. Watermarking Based on DCT Coefficient Modulation technique embeds the watermark in the DCT domain to increase the robustness of the watermarking scheme.DCT based watermarking is an example of frequency domain watermarking. The objective of this research work is to implement DCT based watermarking technique on gray scale image. The study focuses on evaluating the robustness of watermarked image after having three different attacks on watermarked image and extraction of watermark from that particular image. To compare the DCT based watermarking with LSB based watermarking and to validate the proposed work & the comparative results of watermarking using DCT and LSB are also presented. This paper recommends DCT based technique for achieving robustness in digital image watermarking.
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8

Kong, Hui Fang, and Yu Ning Qiu. "Analysis of the Solenoid Driving Technique for DCT." Advanced Materials Research 466-467 (February 2012): 1162–66. http://dx.doi.org/10.4028/www.scientific.net/amr.466-467.1162.

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Анотація:
The control principle of DCT hydraulic system and the working principle of solenoid were described. The solenoid driving circuits based on TLE6220GP and TLE7242-2G of Infineon were designed. The principle of TLE7242-2G control the proportional solenoid and the calculation formula of Kp, Ki were analyzed. The current control waveforms of proportional solenoid in different Kp, Ki were given according to MATLAB simulation.
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9

Gupta, Mukta, Prem Shanker Yadav, and Anubhav Bewerwal. "Blue Channel Replacement Technique for DCT-Compressed Image." International Journal of Applied Information Systems 4, no. 10 (December 15, 2012): 20–23. http://dx.doi.org/10.5120/ijais12-450796.

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10

Pal, Suryakanta, Sudhakar Sahoo, and Birendra Kumar Nayak. "Deterministic Computing Techniques for Perfect Density Classification." International Journal of Bifurcation and Chaos 29, no. 05 (May 2019): 1950064. http://dx.doi.org/10.1142/s0218127419500640.

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Анотація:
The aim of this paper is to solve the density classification task (DCT), an extensively studied classical problem, using one-dimensional nonuniform Cellular Automata (CA) rules. A perfect solution of DCT requires searching for CA rules for binary strings of all possible lengths. But the generic problem is still open though the solution exists only for a specific fixed length CA. This paper provides two fundamental ideas to solve this problem in a better way. The first technique solves this problem using deterministic Turing machines which ultimately leads to generation of different CA rules under periodic boundary conditions. In the second technique, the existence of DCT solution by analyzing the state transition diagrams (STDs) of number conserving CA rules is investigated. The possibility of finding the exact solutions of DCT using Turing machine, STD and number conservation property of CA rules can be viewed as an improvement over the approximate solutions obtained by evolutionary techniques.
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Дисертації з теми "DCT TECHNIQUE"

1

Guezzi, Messaoud Fadoua. "Analyse de l'apport des technologies d'intégration tri-dimensionnelles pour les imageurs CMOS : application aux imageurs à grande dynamique." Thesis, Paris Est, 2014. http://www.theses.fr/2014PEST1022/document.

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Анотація:
La poursuite de l'intégration de fonctions toujours plus complexes au sein d'un même circuit constitue un des principaux enjeux de la microélectronique. L'intégration tridimensionnelle par empilement de circuits (3D stacking) constitue une voie prometteuse pour y parvenir. Elle permet notamment de dépasser certaines limitations atteintes par les circuits actuels, plus particulièrement dans les circuits pour lesquelles les données sont distribuées et qui nécessitent des bandes passantes importantes. Néanmoins, à ce jour, très peu de travaux ont montré les avantages de l'intégration 3D, en particulier ceux s'appuyant sur des résultats expérimentaux et de circuits concrets notamment dans le domaine des imageurs. Le présent travail de thèse a eu pour objectif d'exploiter la technologie 3D dans le cadre des capteurs d'images et dépasser la preuve de concept présentée dans l'état de l'art afin d'apporter une analyse concrète des apports de cette technologie dans le domaine des imageurs visibles. Nous avons identifié, d'une part l'extension de dynamique qui requiert un traitement proche pixel, d'autre part la compression locale, destinée à adresser les problèmes d'intégrité du signal, bande passante et consommation qui deviennent critiques avec l'augmentation des formats des imageurs. Ce choix permet d'apporter une réponse à la limitation de la dynamique des capteurs d'images 2D actuels, tout en gardant une architecture classique des pixels et en adressant le problème de la réduction de la quantité de données à transmettre. Une nouvelle méthode de codage flottant par groupe de pixels a été proposée et implémentée. Le principe s'appuie sur l'adaptation du temps d'intégration par groupe de pixels via l'application d'un exposant commun au groupe. Le temps d'intégration est ajusté à l'image suivante. Un premier niveau de compression est ainsi réalisé par le codage mantisse-exposant proposé. L'implémentation de cette technique a été validée sur un démonstrateur 2D au détriment de pixels sacrifiés aveugles de chaque groupe de pixels, comportant l'électronique de génération des signaux de commande de la HDR. La technique d'extension de dynamique proposée est suivie d'une compression à base de DCT (Discrete Cosine Transform} permettant de réduire le flux de données en sortie de la puce imageur. Les deux niveaux de compression permettent d'atteindre des taux de compression élevés allant jusqu'à 93% en maintenant un PSNR de 30dB et une qualité d'image acceptable pour des post-traitements. Une étude théorique de l'apport de l'intégration 3D en termes de consommation a été élaborée. Enfin, un démonstrateur 2D a été réalisé en technologie CMOS 180 nm en vue de valider l'architecture grande dynamique proposée. L'utilisation de la technologie 3D, dans la suite des travaux, permet l'implémentation d'une boucle courte, devenue possible grâce aux interconnexions verticales sans sacrifier des pixels morts. Le traitement local proche du pixel et la réduction de la latence, du flux de données et de la consommation sont les apports majeurs de l'intégration 3D étudiés dans ce travail
With the increase of systems complexity, integrating different technologies together has become a major challenge. Another challenge has traditionally been the limitation on the throughout between different part of the system coming from the interconnections. If traditional two dimensional integration solutions like System In a Package (SIP) bring heterogonous technologies together there is still limitations coming from the restricted number and lengths of interconnections between the different system components. Three Dimensional stacking (3D), by exploiting short vertical interconnections between different circuits of mixed technologies, has the potential to overcome these limitations. Still, despite strong interests for the 3D concepts, there is no advanced analysis of 3D integration benefits, especially in the field of imagers and smart image sensors. This thesis study the potential benefits of 3D integration, with local processing and short feedback loops, for the realisation of a High Dynamic Range (HDR) image sensor. The dense vertical interconnections are used to locally adapt the integration time by group of pixels, called macro-pixels, while keeping a classic pixel architecture and hence a high fill factor. Stacking the pixel section and circuit section enables a compact pixel and the integration of flexible and versatile functions. High Dynamic Range values producing an important quantity of data, the choice has been made to implement data compression to reduce the circuit throughout. A first level of compression is produced by coding the pixel value using a floating format with a common exponent shared among the macro-pixel. A second level of compression is proposed based on a simplified version of the Discrete Cosine Transform (DCT). Using this two level scheme, a compression of 93% can be obtained with a typical PSNR of 30 dB. A validation of the architecture was carried out by the development; fabrication and test of a prototype on a 2D, 180 nm, CMOS technology. A few pixels of each macro-pixel had to be sacrificed to implement the high dynamic range control signals and emulate the 3D integration. The test results are very promising proving the benefits that will bring the 3D integration in term of power consumption and image quality compared to a classic 2D integration. Future realisations of this architecture, done using a real 3D technology, separating sensing and processing on different circuits communicating by vertical interconnection will not need the sacrifice of any pixel to adjust the integration time, improving power consumption, image quality and latency
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2

Louis-sidney, Ludovic. "Modèles et outils de capitalisation des connaissances en conception : contribution au management et à l'ingénierie des connaissances chez Renault - DCT." Phd thesis, Ecole Centrale Paris, 2011. http://tel.archives-ouvertes.fr/tel-00659298.

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Анотація:
Le changement de paradigme portant la ressource immatérielle qu'est la connaissance au devant des ressources matérielles est à l'oeuvre dans de nombreuses entreprises industrielles. Nos travaux de recherche mettent en lumière les disciplines du management des connaissances et de l'ingénierie des connaissances, apportant des réponses méthodologiques et techniques pour aborder cette ressource. Nous nous intéressons de façon particulière au mode d'exploitation des connaissances par le biais d'objets tangibles (documents, systèmes d'information). Dans ce cadre nous proposons un modèle conceptuel permettant de structurer les outils supports de connaissances d'un organisme. Ce modèle s'adresse principalement aux entreprises ayant une vision processus de leur fonctionnement, conformément à l'ISO 9000. Il a été évalué suivant deux axes. Le premier axe concerne sa capacité descriptive. Nous montrons que le principe de classification à facettes utilisé est apte à être suffisamment précis et complet pour s'adapter à de nombreuses applications. A cet effet, nous exploitons ce principe dans le domaine de l'ingénierie des connaissances et développons un premier démonstrateur permettant de réaliser des échanges automatisés entre fichiers paramétrés. Le second axe concerne l'aptitude du modèle conceptuel proposé à supporter la construction d'un système d'information contribuant à une démarche de management des connaissances. Un démonstrateur implémentant le modèle a été développé et apporte une vision concrète des possibilités offertes par ce dernier.
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3

Ekström, Alexander Gösta. "Developing dynamic combinatorial chemistry as a platform for drug discovery." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/31073.

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Анотація:
Dynamic combinatorial chemistry (DCC) is a powerful tool to identify new ligands for biological targets. In the technique, library synthesis and hit identification are neatly combined into a single step. A labile functionality between fragments allows the biological target to self-select binders from a dynamic combinatorial library (DCL) of interconverting building blocks. The scope of suitable reversible reactions that proceed under thermodynamic control in physiological conditions has been gradually expanded over the last decades, however DCC has thus far failed to gain traction as a technique appropriate for drug discovery in the pharmaceutical industry. The constraints placed on library size by validated analytical techniques, and the effort-intensive reality of this academically elegant concept have not allowed DCC to develop into a broad-platform technique to compete with the high-throughput screening campaigns favoured by medicinal chemists. This thesis seeks to develop DCL analysis techniques, in an effort to increase the library size and accelerate the analysis of DCC experiments. Using a 19F-labelled core scaffold, we constructed a DCL that could be monitored non-invasively by 19F NMR. Building on NMR techniques developed by fragment screening and non-biological DCC campaigns, the method was developed to circumvent the undesired equilibrium-perturbing side effects arising from sample-consuming analytical methods. The N-acylhydrazone (NAH) DCL equilibrated rapidly at pH 6.2 using 4-amino-L-phenylalanine (4-APA) as a novel, physiologically benign, nucleophilic catalyst. The DCL was designed to target b-ketoacyl-ACP synthase III (FabH), an essential bacterial enzyme and antibiotic target. From the 5-membered DCL, a single combination was identified as a privileged structure by our 19F NMR method. The result correlated well with an in vitro assay, validating 19F NMR as a tool for DCL screening. During the 19F NMR study we identified an established antimicrobial compound, 4,5- dichloro-1,2-dithiole-3-one (HR45), to have potential as a core scaffold from which to develop future DCLs targeting FabH. Despite the potentially tractable chemistry of HR45 for DCC, lack of knowledge around the inhibitory mechanism of the compound prevented us from proceeding. Thus, we used mass spectrometry, NMR and molecular modelling to show that HR45 acts by forming a covalent adduct with S. aureus FabH. The 5-chloro substituent directs attack from the nucleophilic thiol side chain of the essential active site cysteine-112 residue via a Michael-type addition elimination mechanism. Although interesting, this mechanism disfavoured the use of HR45 as a core scaffold for NAH exchange in a DCC campaign. Electrospray ionisation mass spectrometry (ESI-MS) is a powerful technique that allows for larger DCLs by eliminating the size-limitations imposed by the need for spectral or chromatographic resolution of DCL members. We developed a 4-APAcatalysed NAH library targeting the pyridoxal 5’-phosphate (PLP) dependent enzyme 7,8-diaminopelargonic acid synthase (BioA), an essential enzyme in the biotin biosynthesis pathway. We exploited the aldehyde moiety of PLP to form an NAH DCL with a panel of hydrazides, and used the BioA isozymes from M. tuberculosis (Mtb) and E. coli to template the library. A combination of buffer exchange and denaturing ESI-MS allowed us to conduct a DCC experiment with a 29-member DCL. Hits from the DCC experiment correlated well with differential scanning fluorimetry (DSF) results. Of these hits, 5 compounds were selected for further study. In vivo activity was displayed by 2 compounds against E. coli and the ESKAPE pathogen A. baumannii. The identification of compounds with antibacterial activity from a DCL further validates ESI-MS as a platform technology for drug discovery.
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4

Aimer, Younes. "Étude des performances d'un système de communication sans fil à haut débit." Thesis, Poitiers, 2019. http://www.theses.fr/2019POIT2269.

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Анотація:
La demande des usagers en termes de débit, de couverture et de qualité de service croît exponentiellement, avec une demande de plus en plus accrue en énergie électrique pour assurer les liaisons entre les réseaux. Dans ce contexte, les nouvelles formes d’ondes basées sur la modulation OFDM se sont répandues et sont utilisées dans les récentes architectures de radiocommunications. Cependant, ces signaux sont très sensibles aux non-linéarités des amplificateurs de puissance à cause des fortes fluctuations d’enveloppe caractérisées par un fort PAPR qui dégrade le bilan énergétique et le rendement de l’émetteur. Dans ce travail de thèse, nous avons tout d’abord dressé un état de l’art des techniques de réduction du PAPR. Cette présentation nous a permis de proposer une nouvelle méthodologie basée sur les techniques d’entrelacement et de codage. Cette première contribution consiste en l’utilisation de la technique d’entrelacement, en faisant appel aux sous porteuses nulles pour la transmission des informations auxiliaires, tout en respectant les spécifications fréquentielles du standard utilisé. La deuxième contribution est basée sur la combinaison des deux techniques de Shaping et de Transformée en Cosinus Discrète DCT, dans l’objectif d’améliorer davantage les performances du système. Les résultats de simulation ont montré que l’utilisation de ces deux techniques permet un gain significatif en termes de réduction du PAPR, qui se traduit par l’amélioration du rendement. Enfin, nous avons présenté une étude expérimentale pour l’ensemble des techniques proposées afin de confirmer les résultats obtenus en simulation. Ces évaluations sont réalisées avec un banc d'essais de radiocommunications pour le test d'un amplificateur de puissance commercial de technologie LDMOS de 20W, fonctionnant à 3.7 GHz en classe AB. Les résultats obtenus pour les standards IEEE 802.11 montrent que ces nouvelles approches permettent de garantir la robustesse de transmission, d’améliorer la qualité des liaisons et d’optimiser la consommation électrique
The request of the users in terms of rate, coverage and quality of service is growing exponentially, with increasing demand for electrical energy, to ensure networks link. In this context, new waveforms based on the OFDM modulation become widely popular and used intensively in recent radio communications architectures. However, these signals are sensitive to the power amplifier nonlinearities because of their high envelope fluctuations characterized by a high PAPR, which degrades the energy consumption and the transmitter efficiency.In this thesis, we first began by a state art of the PAPR reduction techniques. This presentation allowed us to propose a new method based on interleaving and coding techniques. The first contribution consists on the use of the interleaving technique using null-subcarriers for the transmission of the side information, while respecting the frequency specifications of the used standard. The second one is based on the conjunction of the Shaping technique and the Discrete Cosine Transform (DCT), with the aim of improving the performance of the system. Simulation results show that the use of these two techniques allows a significant gain in terms of PAPR reduction, which results in the improvement of the system efficiency. Finally, we presented an experimental study of the proposed techniques using an RF test bench with a commercial LDMOS 20 W PA, class AB operating at 3.7 GHz. The results obtained for the IEEE 802.11 standards show that the proposed approaches allow the transmission robustness and quality, while optimizing the power consumption
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5

Edirisuriya, Amila. "Digital Hardware Architectures for Exact and Approximate DCT Computation Using Number Theoretic Techniques." University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1363233037.

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6

Muradagha, Rafea. "A modified DFT technique for linear phase measurement." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0005/MQ45336.pdf.

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7

Gregušová, Michaela. "Modifikace techniky difúzních gelů (DGT) pro charakterizaci přírodních systémů." Doctoral thesis, Vysoké učení technické v Brně. Fakulta chemická, 2010. http://www.nusl.cz/ntk/nusl-233319.

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Анотація:
Diffusive gradient in thin film technique (DGT) represents a relatively new approach for in situ determinations of labile metal-species in aquatic systems. The DGT device passively accumulates labile species from the solution while deployed in situ, and therefore contamination problems associated with conventional collection and filtration procedures are eliminated. This study deals with a possible modification of DGT technique. The key of using DGT technique for speciation analysis of metals is to find out suitable binding phase and diffusion layer. The new resin gel based on Spheron Oxin (5 sulphophenyl-azo-8-hydroxyquinoline) ion exchanger with a higher selectivity to trace metals than Chelex 100 could potentially provide more information on metals speciation in aquatic systems. The performance of this new binding phase was tested for the determination of Cd, Cu, Ni, Pb and U under laboratory conditions. The hydrogel layer based on poly(2-hydroxyethyl methacrylate) was synthesized and tested as a new diffusion gel for application in DGT technique.
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8

Rio, Jérémy. "Modélisation à l'échelle atomique de Cycloparaphénylènes avec les techniques ab initio." Thesis, Nantes, 2017. http://www.theses.fr/2017NANT4078/document.

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Le travail de cette thèse porte sur l’étude à l’échelle atomique des molécules de Cycloparaphénylènes ([n]CPPs) et leurs dérivés, par modélisation ab initio (calculs par DFT/LDA). La première étude a été de regarder la stabilité de ces anneaux lors de leurs fonctionnalisations par des halogènes et les changements structuraux induits. La notion importante d’énergie de courbure a été soulevée pour trouver de nouvelles routes de synthèse. L’encapsulation de fullerène C60 à l’intérieur des [10]CPPs est une part très importante de cette thèse, avec plus particulièrement l’interaction entre le dimère d’azafullerène (C59N)2 et deux [10]CPPs. Les interactions supramoléculaires et l’alignement de deux [10]CPPs sur ce dimère ont été regardés théoriquement mais aussi expérimentalement grâce à une collaboration avec deux équipes de recherches en Allemagne et en Grèce. La possibilité d’alignement des [10]CPPs a conduit à l’étude de la fonctionnalisation de ces molécules dans le but de les connecter avec différents ponts de type aromatique, polymère ou métallique pour former une nouvelle famille de pseudo-nanotubes composé de [10]CPPs connectés. Selon les connexions utilisées, les propriétés de conduction des pseudo-nanotubes varient de semi-conducteur à large gap jusqu’à des structures métalliques. Dans ce manuscrit, les interactions entre les [n]CPPs et les nanotubes de carbone ont été étudiés pour former des structures où le [n]CPP interagit à l’intérieur ou autour du nanotube de carbone. Dans ce cadre, l’étude de la rotation du [n]CPP montre une très faible force de frottement et permet ainsi de prévoir une rotation ultra rapide du CPP
The work in this thesis concerns the study at the atomic scale of Cycloparaphenylene ([n]CPP) molecules and their complexes and derivatives, using ab initio modeling methods (DFT/LDA). I initially look at the stability of these molecular rings when functionalized by halogens, and the structural changes induced. The important notion of curvature energy is raised to find new synthesis routes. The encapsulation of C60 fullerene inside [10]CPPs is a very important part of this work and more particularly the interaction between the azafullerene dimer (C59N)2 and two [10]CPPs. This allowed us to look at supramolecular interactions and the alignment of two [10]CPPs on this dimer both theoretically and experimentally, through collaboration with research teams in Germany and Greece. The possibility of templated alignment of [10]CPPs leads to a study on the functionalization of these molecules with the aim of connecting them together with various connectors, for example with aromatic species, polymers or metals to form a new family of pseudo-nanotubes composed of multiply inter-linked [10]CPPs. Depending on the connections used, the conduction properties of the 'pseudo-nanotubes' can vary from wide-gap semiconductors to metallic structures. I also show in this manuscript, that [n]CPPs and carbon nanotubes can interact to form structures where the ring is encapsulated inside or around the carbon nanotube. In this context, the study of the rotation of cycloparaphenylene demonstrate a very low frictional force and thus predict ultra-rapid CPP rotation
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9

Dale, Brian M. "Optimal Design of MR Image Acquisition Techniques." Case Western Reserve University School of Graduate Studies / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=case1081556784.

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10

Alrasheed, Waleed. "Time and Space Efficient Techniques for Facial Recognition." Doctoral diss., University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/6238.

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In recent years, there has been an increasing interest in face recognition. As a result, many new facial recognition techniques have been introduced. Recent developments in the field of face recognition have led to an increase in the number of available face recognition commercial products. However, Face recognition techniques are currently constrained by three main factors: recognition accuracy, computational complexity, and storage requirements. The problem is that most of the current face recognition techniques succeed in improving one or two of these factors at the expense of the others. In this dissertation, four novel face recognition techniques that improve the storage and computational requirements of face recognition systems are presented and analyzed. Three of the four novel face recognition techniques to be introduced, namely, Quantized/truncated Transform Domain (QTD), Frequency Domain Thresholding and Quantization (FD-TQ), and Normalized Transform Domain (NTD). All the three techniques utilize the Two-dimensional Discrete Cosine Transform (DCT-II), which reduces the dimensionality of facial feature images, thereby reducing the computational complexity. The fourth novel face recognition technique is introduced, namely, the Normalized Histogram Intensity (NHI). It is based on utilizing the pixel intensity histogram of poses' subimages, which reduces the computational complexity and the needed storage requirements. Various simulation experiments using MATLAB were conducted to test the proposed methods. For the purpose of benchmarking the performance of the proposed methods, the simulation experiments were performed using current state-of-the-art face recognition techniques, namely, Two Dimensional Principal Component Analysis (2DPCA), Two-Directional Two-Dimensional Principal Component Analysis ((2D)^2PCA), and Transform Domain Two Dimensional Principal Component Analysis (TD2DPCA). The experiments were applied to the ORL, Yale, and FERET databases. The experimental results for the proposed techniques confirm that the use of any of the four novel techniques examined in this study results in a significant reduction in computational complexity and storage requirements compared to the state-of-the-art techniques without sacrificing the recognition accuracy.
Ph.D.
Doctorate
Electrical Engineering and Computer Science
Engineering and Computer Science
Electrical Engineering
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Книги з теми "DCT TECHNIQUE"

1

Merhav, Neri. Fast inverse motion compensation algorithms for MPEG-2 and for partial DCT information. Palo Alto, CA: Hewlett-Packard Laboratories, Technical Publications Department, 1996.

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Wang, Francis C. Digital circuit testing: A guide to DFT and other techniques. San Diego: Academic Press, 1991.

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3

(Denmark), Etiske råd, and Københavns universitet, eds. Indlæg fra konferencen: Mennesker og genteknologi i det nye årtusinde : hvordan får vi gen-etik til tiden? : arrangeret af Det Etiske Råd og Københavns Universitet, 9. november 1999. København: Det Etiske råd, 2000.

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4

Sánchez Salcedo, Alejandro. Theory on DC Electric Circuits. Bogotá. Colombia: Universidad de La Salle. Ediciones Unisalle, 2016. http://dx.doi.org/10.19052/9789588939933.

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This book is intended as a major support for the DC Electric Circuits course from the Electrical Engineering program and the Automation Engineering program at Universidad de La Salle. Its main contribution is to provide the students with a step-by-step explanation and detailed illustrations about the main concepts and analysis techniques of DC electric circuits and their related measurement systems.
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5

Lantbruksuniversitet, Sveriges, ed. Direct current plasma(DCP)-atomic emission spectrometry: Development of technique and applications to biological materials. Uppsala: Sveriges Lantbruksuniversitet, 1996.

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6

Mathematics of the discrete Fourier transform (DFT): With music and audio applicaitons. [S.l.]: W3K Pub., 2003.

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7

Friedl, Jeffrey E. F. Mastering Regular Expressions: Powerful techniques for Perl and other tools. Edited by Andy Oram. Cambridge: O'Reilly, 1998.

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8

Friedl, Jeffrey E. F. Mastering Regular Expressions: Powerful techniques for Perl and other tools. Cambridge: O'Reilly, 1997.

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9

Jan, Maes, and Vercammen Marc, eds. Digital audio technology: A guide to CD, MiniDisc, SACD, DVD(A), MP3 and DAT. 4th ed. Oxford: Focal, 2001.

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10

Betshammar, Erik. Men i allt det diffusa, får vi ändå ett säkert grepp om omgivningens karaktär = However, despite the haze you can still get a concrete feeling for the surroundings. Lund, Sweden: Null & Void Publishers, 2019.

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Частини книг з теми "DCT TECHNIQUE"

1

Ghosal, Nabin, Anirban Goswami, Jyotsna Kumar Mondal, and Dipankar Pal. "Image Authentication Technique Based on DCT (IATDCT)." In Advances in Intelligent Systems and Computing, 863–71. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-30111-7_83.

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2

Suhail, M. A., A. H. Siddiqi, and S. Ipson. "A New Fast DCT Based Digital Watermarking Technique." In Applied Optimization, 117–28. Boston, MA: Springer US, 2002. http://dx.doi.org/10.1007/978-1-4613-0263-6_6.

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3

Khelalef, Aziz, Fakhreddine Ababsa, and Nabil Benoudjit. "A Simple Human Activity Recognition Technique Using DCT." In Advanced Concepts for Intelligent Vision Systems, 37–46. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-48680-2_4.

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4

Dhaked, Devender Kumar. "Combined DCT-DWT Color Image Digital Watermarking Technique." In Studies in Autonomic, Data-driven and Industrial Computing, 169–77. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-3915-9_13.

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5

Shekar, B. H., and R. K. Bharathi. "DCT-SVM-Based Technique for Off-line Signature Verification." In Lecture Notes in Electrical Engineering, 843–53. New Delhi: Springer India, 2013. http://dx.doi.org/10.1007/978-81-322-1157-0_85.

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6

Schulze, Christian, Marco Schreyer, Armin Stahl, and Thomas Breuel. "Using DCT Features for Printing Technique and Copy Detection." In Advances in Digital Forensics V, 95–106. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-04155-6_7.

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7

Khare, Priyank, and Vinay Kumar Srivastava. "An Efficient Image Watermarking Technique Based on IWT-DCT-SVD." In Lecture Notes in Electrical Engineering, 841–49. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9775-3_76.

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Gupta, Megha, and R. Rama Kishore. "Secured Blind Image Watermarking Using Entropy Technique in DCT Domain." In Proceedings of Second Doctoral Symposium on Computational Intelligence, 31–47. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-3346-1_3.

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Khare, Priyank, and Vinay Kumar Srivastava. "HT-IWT-DCT-Based Hybrid Technique of Robust Image Watermarking." In Lecture Notes in Electrical Engineering, 359–70. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-6840-4_28.

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Joshi, Amit M., Shubham Gupta, Mohit Girdhar, Pranshu Agarwal, and Ranabir Sarker. "Combined DWT–DCT-Based Video Watermarking Algorithm Using Arnold Transform Technique." In Proceedings of the International Conference on Data Engineering and Communication Technology, 455–63. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-1675-2_45.

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Тези доповідей конференцій з теми "DCT TECHNIQUE"

1

Gangadhar, Deeksha Bekal, and A. G. Ananth. "Satellite Image Compression Using DCT Technique." In 2018 Third International Conference on Electrical, Electronics, Communication, Computer Technologies and Optimization Techniques (ICEECCOT). IEEE, 2018. http://dx.doi.org/10.1109/iceeccot43722.2018.9001533.

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2

Du, Yao-gang, Yan-Shuo Zhang, and Wang Li-Feng. "DCT-Based Video Watermarking Transcoding Technique." In 2007 International Conference on Computational Intelligence and Security Workshops (CISW 2007). IEEE, 2007. http://dx.doi.org/10.1109/cisw.2007.4425579.

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3

Al-Gindy, Ahmed, Amaia Mendez Zorrilla, and Bassam Beyrouti. "DCT Watermarking Technique Using Image Normalization." In 2015 International Conference on Developments of E-Systems Engineering (DeSE). IEEE, 2015. http://dx.doi.org/10.1109/dese.2015.27.

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Agrwal, Shubh Lakshmi, Anita Yadav, Umesh Kumar, and Sandeep Kumar Gupta. "Improved invisible watermarking technique using IWT-DCT." In 2016 5th International Conference on Reliability, Infocom Technologies and Optimization (Trends and Future Directions) (ICRITO). IEEE, 2016. http://dx.doi.org/10.1109/icrito.2016.7784966.

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5

Bhojani, Dhaval R., and Ved Vyas Dwivedi. "Innovative video compression technique using DWT-DCT." In 2012 1st International Conference on Emerging Technology Trends in Electronics, Communication and Networking (ET2ECN). IEEE, 2012. http://dx.doi.org/10.1109/et2ecn.2012.6470097.

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6

Phadatare, Pallavi, and Pratibha Chavan. "Implementation of DCT and Fractal Compression Technique." In 2021 5th International Conference on Electronics, Communication and Aerospace Technology (ICECA). IEEE, 2021. http://dx.doi.org/10.1109/iceca52323.2021.9675895.

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7

Goswami, Anirban, Dipankar Pal, and Nabin Ghoshal. "Authentication technique for gray images using DCT (ATGIDCT)." In 2012 Third International Conference on Emerging Applications of Information Technology (EAIT). IEEE, 2012. http://dx.doi.org/10.1109/eait.2012.6407989.

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8

Agrwal, Shubh Lakshmi, Meeta Sharma, Deeksha Kumari, and Sandeep Kumar Gupta. "Improved image compression technique using IWT-DCT transformation." In 2016 2nd International Conference on Next Generation Computing Technologies (NGCT). IEEE, 2016. http://dx.doi.org/10.1109/ngct.2016.7877499.

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9

Al Baloshi, Mohamed, and Mohammed E. Al-Mualla. "A DCT-Based Watermarking Technique for Image Authentication." In 2007 IEEE/ACS International Conference on Computer Systems and Applications. IEEE, 2007. http://dx.doi.org/10.1109/aiccsa.2007.370717.

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10

Kafri, Nedal M. S., and Hani Y. Suleiman. "Bit-4 of frequency domain-DCT steganography technique." In 2009 First International Conference on Networked Digital Technologies (NDT). IEEE, 2009. http://dx.doi.org/10.1109/ndt.2009.5272108.

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Звіти організацій з теми "DCT TECHNIQUE"

1

Bruce. L51642 Field Nondestructive Examination of ERW Pipe Seams. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), June 1991. http://dx.doi.org/10.55274/r0010587.

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Electric resistance welded (ERW) pipe has been used in the natural gas transmission industry for many years. The Department of Transportation (DOT) has recently expressed interest in the integrity of the weld seam in pipelines made from ERW pipe that was manufactured prior to 1970. Specifically, the DOT has requested that natural gas transmission and hazardous liquid pipeline operators determine whether or not their pipelines that meet this description require hydrostatic proof testing. The initial concern from the DOT was for seam weld selective corrosion, although reference has since been made to growth of manufacturing discontinuities in the ERW seam. Early ERW pipe was manufactured using either direct current or low-frequency alternating current, processes that were prone to producing incomplete fusion discontinuities. These discontinuities (also referred to as cold welds, penetrators, etc.), if present in a pipeline, can grow under normal service or under upset operating conditions resulting in leaks or ruptures. There exists a need for a method that a pipeline operator could use to demonstrate the integrity of pipelines that were made from this older ERW pipe other than hydrostatic testing, which is expensive and potentially harmful to pipeline integrity. The use of a nondestructive-examination (NDE) technique would enable an operator to sample the integrity of a suspect pipeline during other routine in-service maintenance operations without the need for hydrostatic testing. The detection of incomplete fusion discontinuities is difficult if not impossible with conventional NDE techniques. The intimate mechanical contact between compressed surfaces causes a small amount of reflection and a large amount of transmission of ultrasonic signals. Recently however, several ultrasonic techniques have been introduced to study these types of discontinuities in resistance spot welds and inertia friction welds. These new techniques are based on ultrasonic spectroscopy, that is, the frequency dependence of the various ultrasonic interfacial parameters. These parameters include reflection and transmission coefficients and the frequency dependence of ultrasonic volumetric parameters (e.g., velocity and attenuation).
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2

Dunford, Todd, and Shayan Haque. PR-392-113701-R01 Improved Crack Depth Measurement Techniques. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), December 2018. http://dx.doi.org/10.55274/r0011541.

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The PRCI Crack Depth Measurement Program was designed to demonstrate JENTEK technology (being developed under DOT and JENTEK funding) on PRCI and/or PRCI member samples with specific adaptation of measurement procedures to enable practical inspection and reporting of results. Modifications to JENTEK sensing technology and products are being performed under the DOT and JENTEK funding. The objective of this program was to identify appropriate test samples and coordinate demonstration of MWM-Array capability for crack detection and crack depth measurement. JENTEK has now successfully completed Year 4 of this multi-year program and this program is now fully completed.
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3

Jordan, Mary S., and Philip A. Durkee. Verification and Validation of the Satellite Marine-Layer/Elevated Duct Height (SMDH) Technique. Fort Belvoir, VA: Defense Technical Information Center, December 2000. http://dx.doi.org/10.21236/ada390416.

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4

Truong, C. H., E. J. Simburger, R. C. Lacoe, J. C. Ross, and S. Brown. Radiation Effects on a Small DC-DC Converter and a Remedy by Circuit Design Technique. Fort Belvoir, VA: Defense Technical Information Center, May 2002. http://dx.doi.org/10.21236/ada403299.

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5

van der Heijden, Joost. Optimizing electron temperature in quantum dot devices. QDevil ApS, March 2021. http://dx.doi.org/10.53109/ypdh3824.

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The performance and accuracy of quantum electronics is substantially degraded when the temperature of the electrons in the devices is too high. The electron temperature can be reduced with appropriate thermal anchoring and by filtering both the low frequency and radio frequency noise. Ultimately, for high performance filters the electron temperature can approach the phonon temperature (as measured by resistive thermometers) in a dilution refrigerator. In this application note, the method for measuring the electron temperature in a typical quantum electronics device using Coulomb blockade thermometry is described. This technique is applied to find the readily achievable electron temperature in the device when using the QFilter provided by QDevil. With our thermometry measurements, using a single GaAs/AlGaAs quantum dot in an optimized experimental setup, we determined an electron temperature of 28 ± 2 milli-Kelvin for a dilution refrigerator base temperature of 18 milli-Kelvin.
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6

Lawson, K. M., and N. G. Thompson. PR-186-9412-R01 Cathodic Protection in DC Stray Current Areas. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), December 1999. http://dx.doi.org/10.55274/r0011920.

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The objectives of the research were (1) to develop reliable measurement techniques to assess the level of cathodic protection (CP) in stray current areas, (2) to develop reliable CP criteria in the presence of stray currents, and (3) to identify and assess procedures used to mitigate any deleterious effects of the stray currents. The scope of the effort focused on the review of existing technology for the criteria, measurement techniques, and mitigation procedures. In addition, new technologies for pipeline monitoring were developed. Assessment of the new and existing technologies was conducted in both field and laboratory evaluations.
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7

Kiefner. L51606 Technique Development for Polarized Pipe-to-Soil Potential Measurements. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), December 1989. http://dx.doi.org/10.55274/r0010103.

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In the recent past years there has been a considerable amount of effort devoted to developing methods and instruments to correct measured pipe-to-soil potentials for IR drops that may occur from currents (from the cathodic protection system or stray sources) in the soil to obtain the polarized potential. However, many of the methods or instruments available are either time-consuming, cumbersome to use in the field, applicable to only certain types of cathodic protection systems and under particular circumstances, subject to influences from stray current sources or not fully developed as of yet. Thus, there is a need to develop a practical method of determining the polarized pipe potential free of IR drop errors. This report examines and compares seven available methods for measuring polarized potential and describes the advantages and disadvantages of each. The following methods for measuring polarized potential were evaluated: (1) pipe-to-soil measurements with cathodic protection; (2) pipe-to-soil measurements with interrupted cathodic protection (also called instant-off); (3) measurements based on rectifier AC waveform analysis; (4) stepped current reduction; (5) a four-terminal network; (6) extrapolation to zero resistance (IR drop); and (7) a combination of DC/AC transverse measurements.
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8

Kiefner. L52274 Survey and Interpretive Review of Operator Practices for Damage Prevention. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), April 2007. http://dx.doi.org/10.55274/r0010387.

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Pipeline incident data show that about 22 percent of the pipeline incidents reported to the DOT for the period from 1995 through 2003 was caused by excavation damage. Only incidents from all forms of corrosion account for a higher proportion of the incidents, and the corrosion proportion is around 24 percent. This work presents the results of a survey and interpretive review of pipeline operator practices for the prevention of damage to pipelines from mechanical excavating equipment. A recent joint industry-DOT project has produced a compendium of practices and technologies for preventing damage to pipelines. The work described herein represents a follow-on effort to determine how effective these practices and technologies have been with respect to preventing damage. The project was aimed at determining which techniques are effective, which are not effective, and which would be worth further investigation.
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9

Groeneveld. L41039 Locating Coating Defects and Interpreting Cathodic Protection Effectiveness. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), December 1996. http://dx.doi.org/10.55274/r0011227.

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A number of commercially available survey methods were examined to determine the best techniques for locating coating defects and interpreting cathodic protection effectiveness. The survey evaluated numerous methods using AC, DC, and electromagnetic measurement principles. The evaluations were based upon vendor literature, previous technical publications, and practical experience.
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10

Jozewicz, Wojciech, and G. T. Rochelle. Theoretical approach for enhanced mass transfer effects in duct flue gas desulfurization processes. Topical report for Task 4, Novel techniques. Office of Scientific and Technical Information (OSTI), September 1991. http://dx.doi.org/10.2172/10125937.

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