Ce travail aborde le problème de l'identification de signaux et systèmes, appliqué à des problèmes de communications<br />numériques. Contrairement aux méthodes classiques d'optimisation stochastiques, nous proposons une approche algébrique<br />et déterministe. De plus, nous considérons les signaux et systèmes sous leur forme ``physique'' temps-continu, ce qui<br />nous permet d'exploiter certaines connaissances qui peuvent être cachées ou oubliées par un échantillonnage prématuré.<br />Enfin, avec les méthodes algébriques proposées, on abouti à des techniques simples et rapides, qui permettent une<br />implémentation en temps réel.<br /><br />Dans un premier temps, nous abordons le problème de correction des distorsions dans un système de communication par<br />courant porteur, en utilisant la platitude du système représenté par la ligne électrique. Le système inverse de la<br />ligne obtenu est, par la suite, utilisé dans un autre contexte, notamment celui de la correction du timbre de la voix<br />dans un réseau téléphonique.<br /><br />Dans un deuxième temps, le problème de l'identification est abordé dans le cadre d'une nouvelle théorie déterministe de<br />l'estimation reposant sur l'algèbre différentielle et le calcul opérationnel. Partant de cette théorie, nous avons<br />développé un algorithme général d'identifi-cation entrée-sortie d'un système rationnel. De plus, la rapidité des<br />estimations nous permet-tent d'introduire une notion de filtrage local. Ce filtrage rend possible la représentation<br />d'un système de grande dimension par un modèle de dimension très réduite (ordre un ou deux), variable par morceaux dans<br />le temps. Cette modélisation est très intéressante car elle permet une démodulation directe des symboles transmis, sans<br />nécessiter d'identifier/égaliser explicitement le canal.<br /><br />Finalement, le problème de démodulation des signaux modulés en fréquence à phase continue, reçus à travers un canal à<br />bruit additif, a aussi été abordé à la lumière de ces techniques algébriques. Notre démarche consiste à décrire le<br />signal reçu, dans chaque intervalle symbole, par une équation différentielle linéaire bruitée (en général à<br />coefficients variables), dont les coefficients sont des fonctions du symbole courant. La démodulation symbole par<br />symbole devient alors immédiate et particulièrement robuste aux perturbations.

Dans le cadre de cette thèse nous nous intéressons à la liaison d'un terminal utilisateur vers un satellite géostationnaire pour les futurs systèmes d'applications multimédia en bande Ka. Le but est de concevoir une forme d'onde qui permet de s'adapter aux conditions de propagation. L'adaptation des performances en spectre et en puissance de la forme d'onde, notamment dans un contexte avec une forte fluctuation du niveau du signal, comme celui du canal satellite en bande Ka, permet à la fois d'augmenter la capacité et d'améliorer la disponibilité du système. Dans ces travaux, les formes d'onde basées sur les modulations CPM (Continuous Phase Modulation) ont été adoptées. L'enveloppe constante, les différents paramètres ayant un impact sur les performances de la forme d'onde, ainsi que les bonnes performances en puissance lors d'un processus de décodage itératif sont les principales motivations de notre choix. Concernant l'adaptativité nous montrons qu'une forme d'onde CPM basée sur la variation de l'indice de modulation (et éventuellement la réponse en fréquence) au sein d'une famille d'indices ayant un même dénominateur est une solution particulièrement attractive. Une telle solution ne nécessite pas une très grande complexité lors d'un passage d'un mode de transmission à un autre. Elle nécessite essentiellement le changement des coefficients des filtres adaptés. Cette technique permet aussi d'obtenir une marge de performance assez importante vu que l'indice de modulation est le paramètre qui affecte le plus les performances de la CPM. La CPM octale 2RC est un schéma particulièrement attractif d'un point de vue performance.

Amorphous Silicon alloy thin films were deposited by plasma enhanced chemical vapor deposition technique. In order to make optoelectronic measurements, diode structures were fabricated by depositing transparent metal electrodes. Theoretical background of localized density of states in the mobility gap and photocurrent mechanisms has been revisited. In light of this, time of flight technique, using transient photocurrent, was utilized to determine mobility in extended states and characteristic energy of tail states in the film. The actual density of states (DOS) in the mobility gap of the deposited films was determined by using absorption coefficients obtained via constant photocurrent measurements. Finally, adverse effects of small Oxygen incorporation on mobility and DOS were observed.

ITC/USA 2013 Conference Proceedings / The Forty-Ninth Annual International Telemetering Conference and Technical Exhibition / October 21-24, 2013 / Bally's Hotel & Convention Center, Las Vegas, NV / Since the waveform was first developed by the Advanced Range Telemetry Program (ARTM) and adopted by the Range Commanders Council Telemetry Group (RCC/TG), receiver/demodulators for the ARTM Continuous Phase Modulation (CPM) waveform have undergone continued development by several hardware vendors to boost performance in terms of phase noise, detection performance, and resynchronization time. These same results were initially presented at the International Telemetry Conference (ITC) 2003 when hardware first became available supporting this waveform, at the time called ARTM Tier II. This paper reexamines the current state of the art performance of ARTM CPM receiver/demodulators available in the marketplace today.

Continuous Phase Modulation is a popular digital modulation scheme for systems which have tight spectral efficiency and Peak-to-Average ratio (PAR) constraints. In this thesis we propose a method of estimating the capacity for a Continuous Phase Modulation (CPM) system and also describe techniques for design of codes for this system. We note that the CPM modulator can be decomposed into a trellis code followed by a memoryless modulator. This decomposition enables us to perform iterative demodulation of the signal and improve the performance of the system. Thus we have the option of either performing iterative demodulation, where the channel decoder and the demodulator are invoked in an iterative fashion, or a non-iterative demodulation, where the demodulation is performed only once followed by the decoding of the message. We highlight the recent results in the estimation of capacity for channels with memory and apply it to a CPM system. We estimate two different types of capacity of the CPM system over an Additive White Gaussian Noise (AWGN). The first capacity assumes that optimum demodulation and decoding is done, and the second one assumes that the demodulation is done only once. Having obtained the capacity of the system we try to approach this capacity by designing outer codes matched to the CPM system. We utilized LDPC codes, since they can be designed to perform very close to capacity limit of the system. The design complexity for LDPC codes can be reduced by assuming that the input to the decoder is Gaussian distributed. We explore three different ways of approximating the CPM demodulator output to a Gaussian distribution and use it to design LDPC codes for a Bit Interleaved Coded Modulation (BICM) system. Finally we describe the design of Multi Level Codes (MLC) for CPM systems using the capacity matching rule.

Darbo tikslas: nustatyti kineziterapijos priemonių efektyvumą lyginant pasyvias (NPJT) – aktyvias (KT pratimai) kineziterapijos priemones su aktyviomis (KT pratimai) kineziterapijos priemonėmis po pilno kelio sąnario endoprotezavimo operacijos ankstyvajame pooperaciniame etape. Darbo uždaviniai: 1.Įvertinti kelio sąnario lenkimą lyginant pasyvių (NPJT) – aktyvių (KT pratimai ) kineziterapijos priemonių taikymą su aktyvių priemonių (KT pratimai ) taikymu praėjus 24 val., 72 val., 120 val. po operacijos. 2.Įvertinti ir palyginti skausmo pokyčius pagal VAS skalę taikant pasyvias ( NPJT ) - aktyvias (KT pratimai ) kineziterapijos priemones ir aktyvias ( KT ) priemones praėjus 24 val., 72 val., 120 val. po operacijos. 3. Palyginti nueitą atstumą praėjus 48 val., 120 val. po operacijos grupėse. Metodai: anketinė apklausa ir statistinė duomenų analizė. Buvo ištirta 60 asmenų, gydančių Kauno medicinos universiteto klinikų (KMUK ) Ortopedijos – Traumatologijos skyriuje (OTR). Jie buvo atsitiktinių imčių principu suskirstyti į dvi grupes: pirmai grupei buvo taikytos pasyvios kineziterapijos (KT ) priemonės- nuolatinė pasyvaus judesio terapija (NPJT) ir aktyvios kineziterapijos priemonės (KT pratimai), antrai –tik aktyvios (KT pratimai) priemonės praėjus 24 val., 72 val., 120 val. po operacijos. Grupės buvo palygintos tarpusavyje. Pildant anketą, vertinta kelio sąnario judesių amplitudė, skausmas pagal VAS skalę, matuotas nueitas atstumas. Tyrimo medžiaga apdorota... [toliau žr. visą tekstą] / The aim of research: to establish the efficacy of physical therapy comparing passive-active physical therapy with active physical therapy after total knee arthroplasty in early in-patient stage. The goals: 1. Evaluate knee flexion comparing passive-active physical therapy with active physical therapy after 24 h, 72 h, and 120 h after surgery. 2. Evaluate pain changes comparing passive-active physical therapy with active physical therapy after 24 h, 72 h, and 120 h after surgery. 3. Compare the walking distance after 48 h, 120 h after surgery in groups. Methodology of research: 60 patents were observed in Kaunas Medical University Hospital, Orthopedics-Traumatology Department. They were divided into 2 groups. First group got passive-active physical therapy, second group – active physical therapy after 24 h, 72 h, and 120 h. The groups were compared. We evaluated knee range of motion of the operated knee, pain, and the distance which the patient could walk. Results. Total knee arthroplasty is done for older people. Most of them were 70,4-73,8 years old. According to the age, gender, knee deformities, the groups were homogenous. When we evaluated and compared knee range of motion in two groups, statisfically significant diference was got after 120 h after surgery (p=0,001). That means that knee range of motion in 1st group is bigger that in 2nd group. Comparing the pain in groups after 24 h, 72 h, and 120 h, we did’nt get statistically significant difference (p>0,05)... [to full text]

Made available in DSpace on 2014-12-17T14:07:17Z (GMT). No. of bitstreams: 1 LauraXL_DISSERT.pdf: 3047950 bytes, checksum: 570af1df35d3161d6677ac6ec832e390 (MD5) Previous issue date: 2013-12-16 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / Recent studies are investigating a new class of inorganic materials which arise as a promising option for high performance applications in the field of photoluminescence. Highlight for rare earth (TR +3 ) doped, which have a high luminous efficiency, long decay time and being able to emit radiation in the visible range, specific to each element. In this study, we synthesized ZrO2: Tb +3 , Eu +3 , Tm +3 nanoparticles complex polymerization method (CPM). We investigated the influences caused by the heat treatment temperature and the content of dopants in zirconia photoluminescent behavior. The particles were calcined at temperature of 400, 500 and 600 ? C for two hours and ranged in concentration of dopants 1, 2, 4 and 8 mol% TR +3 . The samples were characterized by thermal analysis, X-ray diffraction, photoluminescence of measurements and uv-visible of spectroscopies. The results of X-ray diffraction confirmed the formation of the tetragonal and cubic phases in accordance with the content of dopants. The photoluminescence spectra show emission in the region corresponding simultaneous to blue (450 nm), green (550 nm) and red (615 nm). According to the results, ZrO2 particles co-doped with rare earth ions is a promising material white emission with a potential application in the field of photoluminescence / Estudos recentes investigam uma nova classe de materiais inorg?nicos que surgem como uma op??o promissora em aplica??es de alto desempenho no campo da fotoluminesc?ncia. Destaque para f?sforos dopados com ?ons de terras raras (TR +3 ), que possuem uma alta efici?ncia luminosa, um longo tempo de decaimento e por serem capazes de emitir radia??es na faixa do vis?vel, espec?ficas de cada elemento. Neste trabalho, foram sintetizadas nanopart?culas de ZrO2:Tb +3 , Eu +3 , Tm +3 pelo m?todo de polimeriza??o dos complexos (MPC). Foram investigadas as influ?ncias causadas pela temperatura de tratamento t?rmico e pelo teor dos dopantes no comportamento fotoluminescente da zirc?nia. As part?culas foram calcinadas nas temperaturas de 400, 500 e 600?C durante duas horas e a concentra??o dos dopantes variou em 1, 2, 4 e 8% mol TR +3 . As amostras foram caracterizadas por an?lises t?rmicas (TG/ DSC), difra??o de raios X (DRX), medidas de fotoluminesc?ncia (FL) e espectroscopia na regi?o do UV-Vis?vel (UV-vis). Os resultados de difra??o de raios X confirmaram a forma??o das fases tetragonal e c?bica de acordo com o teor de dopantes. Os espectros de fotoluminesc?ncia apresentam emiss?es simult?neas correspondentes na regi?o do azul (450 nm), do verde (550 nm) e do vermelho (615 nm). De acordo com os resultados obtidos, as part?culas de ZrO2 codopadas com ?ons de terras raras apresentam-se como um material promissor para emiss?o no branco com um potencial de aplica??o no campo da fotoluminesc?ncia

The tittle of the diploma thesis is Attitudes to online banner advertising on social network VK.com as a channel for purchasing clothing. The main objective is to examine attitudes of the registered users of Russian social network VK.com to banner advertising. Author of the diploma thesis explaines the role of online banner advertising, its main types and forms. To determine users attitudes to online banner advertising, qualitative and quantitative researches were made. The diploma thesis consists of two parts: literature overview and practical part. The first part focuses on a theoretical background; specified terms and definitions of online banner advertising were described. The practical part focuses on the detailed analysis of the online banner advertising on a chosen social network. The conditions of the placement and payment methods were examined. Practical part includes the survey and interpretation of the results. In the final chapter, based on the results of the questionnaire and the calculations, author provides the recommendations for the increase of the online banner advertising effectiveness. Author advices the social network how to avoid the banner blindness effect and to attract the attention of users.

The subject of my diploma thesis is internet marketing. Due to its complexity, the thesis focus mainly on online advertisement, primarily to PPC campaigns. The thesis provides summary of PPC advertisement itself, their rules and also the whole structure of campaigns, keywords etc. The same concept is used for social network Facebook and its advertisement. The target is to point out the importance of both approaches and also to show the main differences between them. These findings are used for practical part, where the real PPC and Facebook campaigns are put into practice for selected institution. The target of this work is to use the findings from literatury research in the real case scenario. Based on the campaigns result, find out what are the positives and negatives of such campaigns and to show how important the internet marketing is.

This thesis deals with crisis management. The theoretical part deals with the definition of basic concepts from several authors. The custom thesis analyzes the effectiveness of the deployment of the Army in the region. I used the measurement methods of historical comparisons or desired state by the CPM (Critical path method) in a particular situation. After the analysis follows the recommendations on how to get more efficient deployment of armed forces for unexpected events and to accelerate the return to economic stability.