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Tytuł:
Optimization of overlay computing systems with many – to - many transmissions
Optymalizacja nakładkowych systemów obliczeniowych z transmisjami wielu do wielu
Autorzy:
Walkowiak, K.
Kasprzak, A.
Andrusieczko, K.
Powiązania:
https://bibliotekanauki.pl/articles/375736.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
optimization
computing systems
overlay
heuristics
Opis:
The problem that this paper investigates, namely, optimization of overlay computing systems, follows naturally from growing need for effective processing and consequently, fast development of various distributed systems. We consider an overlay-based computing system, i.e., a virtual computing system is deployed on the top of an existing physical network (e.g., Internet) providing connectivity between computing nodes. The main motivation behind the overlay concept is simple provision of network functionalities (e.g., diversity, flexibility, manageability) in a relatively cost-effective way as well as regardless of physical and logical structure of underlying networks. The workflow of tasks processed in the computing system assumes that there are many sources of input data and many destinations of output data, i.e., many-to-many transmissions are used in the system. The addressed optimization problem is formulated in the form of an ILP (Integer Linear Programing) model. Since the model is computationally demanding and NPcomplete, besides the branch-and-bound algorithm included in the CPLEX solver, we propose additional cut inequalities. Moreover, we present and test two effective heuristic algorithms: tabu search and greedy. Both methods yield satisfactory results close to optimal.
Zagadnienia dotyczące optymalizacji systemów obliczeń rozproszonych zyskują w ostatnich latach na znaczeniu. Systemy obliczeń rozproszonych rozwijane są w dwóch podstawowych architekturach sieciowych. Po pierwsze, budowane są dedykowane sieci optyczne łączące ośrodki obliczeniowe. Po drugie, wykorzystuje się istniejącą infrastrukturę sieciową (np. Internet) dla budowania systemów pracujących w architekturze nakładkowej (ang. overlay). Ta druga koncepcja zyskuje ostatnio dużą popularność, gdyż umożliwia szybką i tanią realizację systemów obliczeniowych bez potrzeby mocnej współpracy z operatorami sieciowymi. W pracy rozważamy nakładkowy system obliczeniowy umożliwiający transmisje wielu do wielu – dane wejściowe do obliczeń są generowane w wielu źródłach (węzłach sieciowych), następnie po przetworzeniu są przesyłane do wielu odbiorców zainteresowanych wynikami obliczeń. W oparciu o zaproponowaną architekturę systemu, w pracy sformułowano problem optymalizacyjny mający na celu minimalizację kosztów operacyjnych systemu obejmujących koszty obliczeń i koszty przesyłania danych. Model został zapisany jako program całkowitoliczbowy. Z uwagi na fakt, że ten problem należy do klasy problemów NP-zupełnych, zaproponowano dodatkowe odcięcia dla algorytmu podziału i oszacowań oraz dwa efektywne algorytmy heurystyczne. Przeprowadzone eksperymenty obliczeniowe wykazały, że opracowane algorytmy dają wyniki bliskie optymalnym w mniejszym czasie niż algorytm optymalny zawarty w pakiecie CPLEX
Źródło:
Theoretical and Applied Informatics; 2012, 24, 4; 271-291
1896-5334
Pojawia się w:
Theoretical and Applied Informatics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of Minimum Cost Overlay Multicast Tree in Two Layer Networks
Autorzy:
Kucharzak, M.
Walkowiak, K.
Powiązania:
https://bibliotekanauki.pl/articles/226288.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
modelling
overlay multicast
multilayer networks
Opis:
Multicast realises the data delivering to a group of destinations simultaneously while using the minimum network resources. The first implementation of multicasting has been built using specialized multicast routers and is well known as IP Multicast. Such a network comprises some drawback including complex addressing and routing scheme, it requires the deployment of special routers that are rather expensive and finally, there has not been proposed a reasonable business model regarding cross-providers multicast realization. Thereby, for the past few years, a new interest in delivering multicast traffic has arisen and some multicast systems defined for end-hosts overlay network have been successfully proposed. Overlay multicast implements a multicast technique at the top of computer networks and creates a virtual topology of clients which duplicate packets and maintain a multicast structure. This overlay structure forms an independent layer with logical links between the nodes without the knowledge about the underlaying topology. In the work we take a look at flow cost minimization of multicast stream in a system which combines the advantages of overlays and underlaying network awareness. This papers presents three independent linear-based models aimed at optimization of multicast tree topology and its network level unicast realization. The proposed formulations can be applied for deriving either lower bound of flows costs in existing systems or for designing new cooperative multilayer protocols for effective multicast transmission.
Źródło:
International Journal of Electronics and Telecommunications; 2011, 57, 3; 317-322
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two Approaches to Network Design Problem for Overlay Multicast with Limited Tree Delay : Model and Optimal Results
Autorzy:
Szostak, M.
Walkowiak, K.
Powiązania:
https://bibliotekanauki.pl/articles/226284.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
overlay network
multicasting
optimization
network design
Opis:
Live multimedia streaming and on-demand streaming applications (such as Internet radio or Internet TV) have been gaining more popularity in recent years. They require significant amount of bandwidth from media streaming servers and can easily saturate network infrastructure when the number of participant or bit rate of streaming content increases. Overlay multicast is an effective approach to the problem of streaming distribution. It combines flexibility of application layer multicast with efficiency of network layer multicast. Since overlay networks are built on the top of existing infrastructure, the cost of maintenance and deployment of this solution is relatively low compared to traditional Content Distribution Networks (CDN). Based on our previous works, we focus on solving the overlay network design problem to economically distribute content among the participants using overlay multicast. The optimization goal is to minimize the overlay network cost expressed by the cost of access links. Additionally, we assume that the maximum total delay of a streaming tree is upper bounded to provide QoS (Quality of Service) guarantees. We present two approaches to this problem and construct model using Levels and Flow Conservation Constraints. We show how various constraints following from real overlay systems influence the behavior of the distributing system. In numerical experiments we use real ISPs' price lists. To illustrate our approach we present optimal results obtained from the CPLEX solver.
Źródło:
International Journal of Electronics and Telecommunications; 2011, 57, 3; 335-340
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Minimizing cost of network upgrade for overlay multicast – heuristic approach
Autorzy:
Szostak, M.
Walkowiak, K.
Powiązania:
https://bibliotekanauki.pl/articles/309120.pdf
Data publikacji:
2013
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
multicasting
network design
optimization
overlay network
streaming
Opis:
A rapid increase of the Internet users and traffic at the rate of 31% in years 2011–2016 contributes to emerging of new approaches to the content distribution. Among other approaches, the overlay multicasting seems to be one of the most interesting concepts according to relatively low deployment costs and large scalability. In this paper, the authors formulate a new incremental multicast overlay design problem. In particular, authors assumed that the overlay network is to be upgraded due to an increase of the number of participating users and the need to improve the streaming quality. However, the existing multicast tree structure is assumed to remain fixed. The goal was to minimize the cost of the upgrade, represented in euro/month. To achieve it, for each peer participating in the transmission, a link type offered by one of the ISPs was selected and overlay trees were constructed, rooted at the source of the content. The authors also present a new heuristic algorithm to efficiently solve this problem. According to experiments, the biggest factor influencing the upgrade cost and determining possible streaming quality values that the system can be upgraded to is the initial tree structure.
Źródło:
Journal of Telecommunications and Information Technology; 2013, 3; 66-73
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Random Approach to Optimization of Overlay Public-Resource Computing Systems
Autorzy:
Chmaj, G.
Walkowiak, K.
Powiązania:
https://bibliotekanauki.pl/articles/226168.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
computing systems
overlay
P2P
unicast
optimization
Opis:
The growing need for computationally demanding systems triggers the development of various network-oriented computing systems organized in a distributed manner. In this work we concentrate on one kind of such systems, i.e. public-resource computing systems. The considered system works on the top of an overlay network and uses personal computers and other relatively simple electronic equipment instead of supercomputers. We assume that two kinds of network flows are used to distribute the data in the public-resource computing systems: unicast and peer-to-peer. We formulate an optimization model of the system. After that we propose random algorithms that optimize jointly the allocation of computational tasks and the distribution of the output data. To evaluate the algorithms we run numerical experiments and present results showing the comparison of the random approach against optimal solutions provided by the CPLEX solver.
Źródło:
International Journal of Electronics and Telecommunications; 2010, 56, 1; 55-61
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Technological solutions to extend the operating cycle of tools and industrial machinery
Autorzy:
Lukarski, Y.
Tashev, P.
Argirov, C.
Kondov, H.
Powiązania:
https://bibliotekanauki.pl/articles/391484.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
Tematy:
operational lifetime
new materials
overlay welding
thermo-chemical treatment
Opis:
One of the most significant problems that engineers and researchers face is the development of technological solutions to extend the exploitation cycle of tools and industrial machinery. The research shows there are a few possibilities to solve this problem: 1. Development of new materials of enhanced working characteristics compared to those currently used. An example of this is the introduction of new metals and alloys in the automotive industry, the mining industry, etc. 2. Preventive processing of assemblies and parts prior to their use consisting mainly in overlay welding with wear resistant layers or thermo-chemical surface treatment of the parts. 3. Recovering assemblies and parts after their resource has been depleted. This is mainly applied in the mining industry, road construction, etc. Worn-out tools are overlay welded and reused. It has been proven that the price of the recovered details is 2 to 20 times lower than that of the new ones. Moreover, it should be pointed out that the recovery saves energy and ore resources and thus a significant environmental impact is achieved.
Źródło:
Prace Instytutu Odlewnictwa; 2017, 57, 4; 253-258
1899-2439
Pojawia się w:
Prace Instytutu Odlewnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Overlay Multicast Optimization : IBM ILOG CPLEX
Autorzy:
Kucharzak, M.
Zydek, D.
Poźniak-Koszałka, I.
Powiązania:
https://bibliotekanauki.pl/articles/226362.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
overlay multicast
maximum flows
linear programming
mixed-integer programming
Opis:
IBM ILOG CPLEX Optimization Studio delivers advanced and complex optimization libraries that solve linear programming (LP) and related problems, e.g., mixed integer. Moreover, the optimization tool provides users with its Academic Research Edition, which is available for teaching and noncommercial research at no-charge. This paper describes the usage of CPLEX C++ API for solving linear problems and, as an exhaustive example, optimization of network flows in overlay multicast is taken into account. Applying continuous and integral variables and implementing various constraints, including equations and inequalities, as well as setting some global parameters of the solver are presented and widely explained.
Źródło:
International Journal of Electronics and Telecommunications; 2012, 58, 4; 381-388
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A P2P-based Communication Framework for Geo-Location Oriented Networks
Autorzy:
Miyoshi, Takumi
Shimomura, Yusuke
Fourmaux, Olivier
Powiązania:
https://bibliotekanauki.pl/articles/307656.pdf
Data publikacji:
2019
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
geolocation oriented network
location-based service
overlay
peer-to-peer
Opis:
This paper proposes a novel peer-to-peer communication framework to implement geographical location oriented networks, called G-LocON. Location-based services have been gaining in popularity, as proven by ridesharing and mobile games. Although these services have to construct geolocation oriented networks based on their users’ geographical locations, they completely rely on client/server models to communicate with neighboring terminals. G-LocON provides geolocation oriented device-to-device communication only with the current wireless technologies, such as LTE and Wi-Fi, cooperating with the global positioning system and peer-to-peer overlay networking. G-LocON will serve as a type of a mobile ad-hoc network in which devices located within the focusing area are capable of communicating directly. We developed a primitive Android application to implement the GLocON framework. Evaluation of the solution’s performance has verified the usefulness of the proposed system that offers an admissive transmission delay. Moreover, to confirm the application-related potential of the G-LocON framework, we also show a practical map software in which all neighboring mobile devices present in the focusing area are displayed.
Źródło:
Journal of Telecommunications and Information Technology; 2019, 1; 58-66
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
COMPARATOR – a Universal Application for Forensic Comparative Examinations and a Statistical Analysis of Sample Parameters
Autorzy:
Goc, Mieczysław
Jastrzębski, Piotr
Semków, Dorota
Powiązania:
https://bibliotekanauki.pl/articles/45454805.pdf
Data publikacji:
2023-08-23
Wydawca:
Akademia Policji w Szczytnie
Tematy:
Comparator
comparative research
editing module
geometry module
images overlay
statistics
Opis:
In recent years, both in Poland and abroad, computer analysis methods have been increasingly used in forensic examinations. The article presents the operation and functionality of the computer program called COMPARATOR which is a joint project of the Polish Forensic Association and its Institute of Criminalistics. The COMPARATOR program is used for registration and presentation of images (samples) of handwriting, documents or their fragments as well as various types of forensic traces in 8 windows. The program allows of numerous useful operations in comparative and identification forensic analyses (including drawing, inversions, measurements, images overlay and matching). The application combines the advantages of graphic programs and spreadsheets - the user can directly perform statistical analyzes. It might also be used as a didactic aid for lecturers and speakers of diverse areas of expertise who want to present several images on the screen simultaneously in their lectures.
Źródło:
Przegląd Policyjny; 2023, 150(2); 246-271
0867-5708
Pojawia się w:
Przegląd Policyjny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of TiN nanoparticles on the microstructure and hardness of arc overlaid welding layers
Autorzy:
Kondov, H.
Tashev, P.
Powiązania:
https://bibliotekanauki.pl/articles/391391.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
Tematy:
arc overlay welding
nanomodifiers
nanosized TiN
nanopowders
heat treatment
Vickers hardness
Opis:
Electrodes for manual arc overlay welding with coating containing nanomodifier TiN in concentrations between 0.2% and 1.5% were developed and manufactured. Samples of welded overlay layers with electrodes were both examined by electron microscopy and X-ray microanalysis. Some samples were subjected to heat treatment consisting of annealing and subsequent hardening in water and oil. The Vickers hardness HV15/15 of the samples in the prepared state, and both after annealing and hardening were measured. It was found that growth of the hardness of nanomodified layers were up to 180 percent compared to the reference sample.
Źródło:
Prace Instytutu Odlewnictwa; 2017, 57, 4; 309-314
1899-2439
Pojawia się w:
Prace Instytutu Odlewnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
TEM Microstructure and Chemical Composition of Transition Zone between Steel Tube and an Inconel 625 Weld Overlay Coating Produced by CMT Method
Autorzy:
Rozmus-Górnikowska, M.
Blicharski, M.
Powiązania:
https://bibliotekanauki.pl/articles/354162.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Inconel 625
weld overlay coating
transition zone
martensite
CMT
STEM
TEM
Opis:
The aim of this work was to investigate the microstructure and chemical composition of the transition zone between 16Mo3 steel and Inconel 625 weld overlay coating produced by the Cold Metal Transfer (CMT) method. Investigations were primarily carried out through transmission electron microscopy (TEM) on thin foils prepared by FIB (Focus Ion Beam). The chemical analysis demonstrated that the amount of certain elements (Fe, Ni, Cr, Mo, Nb) in the transition zone between the base material and the weld overlay changes quickly, from the composition of the steel to the composition of the composite zone. STEM and TEM investigations revealed that two areas are clearly visible in the transition zone. In the narrow band close to the fusion boundary where plates are clearly visible and the Ms temperature is higher than room temperature, electron diffraction analyses show reflections of martensite and austenite. Moreover, the crystallographic relations between martensite and austenite can be described by the Kurdjumov-Sachs (K-S) relationship {110}α’ || {111}γ <111>α’ || <110>y ). The microstructure of the part of the transition zone with an Ms temperature lower than room temperature as well as that of the composite zone is austenite. The investigations proved that the width of the martensitic area can be significantly limited by using the CMT technique for weld overlaying.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2A; 787-793
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure of 309 and 310 Austenitic Stainless Steel CMT Overlays on the 16Mo3 Pressure Vessel Steel
Autorzy:
Rozmus-Górnikowska, Magdalena
Dymek, Stanisław
Blicharski, M.
Cieniek, Łukasz
Kusiński, Jan
Powiązania:
https://bibliotekanauki.pl/articles/2049742.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
309 austenitic steel
310 austenitic steel
weld overlay coating
CMT
SEM
EDS
Opis:
The aim of this work was to characterize the changes in microstructure and chemical composition of the austenitic overlays on a pressure vessel steel that occur in the vicinity of the interface between the overlay and the base material. The investigations were carried out on a 16Mo3 boiler pipes weld overlaid by 309 and 310 steels. The microstructural examinations were performed on longitudinal cross-sectioned samples. The qualitative and quantitative chemical composition analyses on metallographic samples were determined on Scanning Electron Microscopy (SEM) by means of Energy Dispersive Spectrometry (EDS). The article analyzes the influence of the solidification sequence in both types of steel on final microstructure.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 2; 645-649
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microsegregation and Precipitates in Inconel 625 Arc Weld Overlay Coatings on Boiler Pipes
Mikrosegregacja i wydzielenia w powłokach ze stopu Inconel 625 napawanych łukowo na rury kotłowe
Autorzy:
Rozmus-Górnikowska, M.
Blicharski, M.
Powiązania:
https://bibliotekanauki.pl/articles/355070.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
microsegregation
precipitates
Inconel 625
weld overlay
SEM
TEM
STEM
mikrosegregacja
wydzielenia
napoiny
Opis:
The aim of this work was to investigate the microsegregation and precipitates formed due to segregation in Inconel 625 arc weld overlay coatings on boiler pipes. Examination of microsegregation and precipitates were carried out by means of a scanning electron microscope (SEM) equipped with an EDS detector as well as a transmission electron microscope (TEM) equipped with a HAADF (STEM) and an EDS detectors. The presence of precipitations in the weld overlay was also confirmed with X-ray diffraction analysis (XRD) of residue in the form of powder that remained after the electrolytic dissolution of weld overlay matrix. The investigations showed that the interdendritic regions were considerably enriched during microsegregation with Nb, and less so with Mo. The distribution of Cr and Fe in the weld overlay is relatively uniform. The value of the partition coefficient k for Mo and Nb is lower than 1. Therefore, these elements segregate during solidification into the liquid and, once solidification is finished, the interdendritic regions are considerably enriched with these elements. The value of k for Cr, Ni and Fe are only slightly higher than 1. Though the Inconel 625 is a solid-solution strengthened alloy, precipitation of secondary phases occurs in weld overlays. Precipitations were identified as a Laves phase and carbonitrides (Nb, Ti)(C, N).
Celem pracy była ocena segregacji dendrytycznej (mikrosegregacji) oraz identyfikacja wydzieleń w napoinach ze stopu Inconel 625 napawanych metodą CMT na rury kotłowe. Badania segregacji dendrytycznej oraz składu chemicznego wydzieleń w napoinach ze stopu Inconel 625 prowadzono za pomocą mikroskopu elektronowego skaningowego NanoSEM 450 firmy FEI wyposażonego w detektor EDS firmy EDAX oraz za pomocą mikroskopu elektronowego transmisyjnego (TEM, TECNAI GF20) wyposażonego w detektor HAADF do badań techniką skaningowo - transmisyjną STEM, jak również zintegrowany spektrometr promieniowania rentgenowskiego do analizy składu chemicznego firmy EDAX. Obecność wydzieleń została potwierdzona za pomocą rentgenowskiej analizy fazowej (XRD) cząstek proszku osadu uzyskanego w wyniku elektrolitycznego rozpuszczenia osnowy napoiny. Badania wykazały, że w wyniku mikrosegregacji zachodzącej podczas krzepnięcia napoin następuje znaczne wzbogacenie obszarów międzydendrytycznych tj. obszarów między ramionami dendrytów w Nb a mniejsze w Mo. Wartość równowagowego współczynnika rozdziału k dla Mo i Nb jest mniejsza od 1, dlatego podczas krystalizacji pierwiastki te segregują do cieczy, a zatem, po zakończeniu krystalizacji obszary międzydendrytyczne są znacznie wzbogacone w w/w pierwiastki. Pomimo, że stop Inconel 625 jest stopem umacnianym roztworowo to w napoinach występowały wydzielenia. Na podstawie wyników analizy składu chemicznego, jak również rentgenowskiej analizy fazowej wydzielenia te zidentyfikowano jako fazę Lavesa oraz (Nb, Ti)(C, N).
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 4; 2599-2606
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ sposobu preparacji ubytku typu mod w przedtrzonowcach leczonych endodontycznie na wytężenie twardych tkanek zęba
The impact of mod cavity preparation in endodontically treated premolars on strength of tooth hard tissues
Autorzy:
Kiszka, G.
Chojnacka-Brożek, A.
Powiązania:
https://bibliotekanauki.pl/articles/99261.pdf
Data publikacji:
2015
Wydawca:
Politechnika Śląska. Katedra Biomechatroniki
Tematy:
inlay
onlay
overlay
terapia endodontyczna
MES
zęby przedtrzonowe
endodontical therapy
FEM
premoral teeth
Opis:
W pracy przedstawiono wpływ poszczególnych metod preparacji ubytku typu MOD (mezjalno-okluzyjno-dystalnego) pod pośrednie wypełnienia koronowe typu inlay, onlay i overlay na wytężenie twardych tkanek zęba. Wykorzystano numeryczny model zęba przedtrzonowego leczonego endodontycznie odbudowanego wkładami koronowo-korzeniowymi. Zamodelowano geometrię ubytku dla odpowiednich typów rekonstrukcji korony oraz przeprowadzono numeryczną analizę wytrzymałościową modeli w warunkach prawidłowej okluzji w programie ANSYS Workbench.
The paper presents the impact of MOD (Mezial-Occlusal-Distal) cavity preparation for indirect restorations type inlay, onlay and overlay. The numerical model of premolar tooth treated endodontically with the use of root dowels has been used. It has been modeled the geometry of cavity for the respective types of crown reconstruction and executed the numerical strength analysis of tooth models under normal occlusion to ANSYS Workbench program.
Źródło:
Aktualne Problemy Biomechaniki; 2015, 9; 57-60
1898-763X
Pojawia się w:
Aktualne Problemy Biomechaniki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
CT/SPECT image fusion in patients treated with iodine-131
Autorzy:
Psiuk-Maksymowicz, K.
Borys, D.
Gorczewski, K.
Steinhof, K.
d'Amico, A.
Powiązania:
https://bibliotekanauki.pl/articles/333051.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
połączenie obrazu
emisyjna tomografia komputerowa pojedynczego fotonu
image fusion
SPECT-CT overlay
point-based method
Opis:
Computer tomography gives visualization of anatomical structures and abnormalities, but it lacks of functional information. On the other hand, single photon emission tomography provides the missing information about the tumour function, but it has relative low resolution and the localization of the visible focus may be difficult, especially when iodine ¹³¹I is used. Thus, several methods of image fusion are applied. We present an algorithm of image fusion based on affine transformation. On the base of a phantom study, we showed that the created program can be a useful tool to fuse CT and SPECT images and then applied to patients' datasets. External marker method was used to align patient functional and anatomical data. Image alignment quality depends on appropriate marker placement and acquisition protocol. The program estimates maximal misalignment in a volume between the markers. Created acquisition protocol minimizes misalignment of patient placement on both CT and gamma camera, however misalignment derived from respiratory movements cannot be avoided. The proposed technique is simple, low-cost and can be easily adopted in any hospital or diagnostic centre equipped with gamma camera and CT. Fusion of morphology and function can improve diagnostic accuracy in many clinical circumstances.
Źródło:
Journal of Medical Informatics & Technologies; 2004, 8; II7-12
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł

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