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    Wyświetlanie 1-17 z 17
    Tytuł:
    Ukształtowanie powierzchni terenu a wartości metryk krajobrazowych w górach wysokich na przykładzie Tatr
    Autorzy:
    Niedźwiecki, Jan
    Kolecka, Natalia
    Powiązania:
    https://bibliotekanauki.pl/articles/634045.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
    Tematy:
    landscape metrics
    high mountain landscape
    Tatra Mountains
    3D approach
    metryki krajobrazowe
    krajobraz wysokogórski
    Tatry
    podejście 3D
    Opis:
    W niniejszej pracy zaprezentowano wyniki porównania wartości wybranych metryk krajobrazowych otrzymanych na podstawie obliczeń wykonanych dwiema metodami: metodą tradycyjną, w której pomiarów dokonuje się po zrzutowaniu mozaiki jednostek przestrzennych na powierzchnię planimetryczną, oraz metodą uwzględniającą trzeci wymiar krajobrazu – opartą na analizie numerycznego modelu terenu. Badania wykazały, że zastosowane metody mogą mieć wpływ na uzyskany obraz struktury krajobrazu wysokogórskiego. Ponadto w pracy zawarto uwagi dotyczące obliczania średniej szorstkości powierzchni oraz analiz wykonywanych przy wykorzystaniu pól geometrycznych w danym typie krajobrazu.
    The aim of the authors was to compare values of 2D and 3D landscape metrics in high mountains. The first part of the work takes into consideration the spatial structure of vegetation (the rank of landscape facias/ecotopes) of Kocioł Goryczkowy Świński, which was investigated in 1999 by Anna Kozłowska and Anna Jakomulska. The calculation of landscape metrics is resumed using the true surface geometries and compared with the result of traditional measurements on a reference plane. In the second part of the paper, a set of commonly used landscape metrics is calculated for the geocomplexes (rank of uroczysko unit) in the Morskie Oko catchment using both true surface and plain geometries. Finally average surface roughness is computed for the both study areas and some remarks for landscape metrics computed for geometric fields are given. The comparison shows that appropriate 2D and 3D metrics may differ significantly. Moreover, there is a strong correlation between the size of the discrepancy and the surface slope. For that reason, it is very important to distinguish between 2D and 3D metrics and to use them consciously, according to the particular problem.
    Źródło:
    Prace Geograficzne; 2012, 128; 81-98
    1644-3586
    Pojawia się w:
    Prace Geograficzne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EMOT - an evolutionary approach to 3D computer animation
    Autorzy:
    Kwaśnicka, H.
    Woźniak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1943270.pdf
    Data publikacji:
    2007
    Wydawca:
    Politechnika Gdańska
    Tematy:
    gene expression programming
    computer animation
    simulation
    motion
    Opis:
    Key-framing and Inverse Kinematics are popular animation methods, but new approaches are still developed. We propose a new evolutionary method of creating animation - the EMOT (Evolutionary MOTion) system. It enables automation of motion of animated characters and uses a new evolutionary approach - Gene Expression Programming (GEP). Characters are controlled by computer programs, an animator providing the way of motion's evaluation. GEP works with a randomly selected initial population, using directed but random selection. Experiments have shown that the proposed method is capable of developing robust controllers.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2007, 11, 1-2; 71-86
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical modeling of dispersion process for different density of gas mixtures – 2d and 3d numerical approach
    Numeryczne modelowanie dyspersji gazów o różnej gęstości w ujęciu dwuwymiarowym i trójwymiarowym
    Autorzy:
    Polańczyk, A.
    Salamonowicz, Z.
    Dmochowska, A.
    Makowski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/136318.pdf
    Data publikacji:
    2018
    Wydawca:
    Szkoła Główna Służby Pożarniczej
    Tematy:
    Ammonia dispersion
    chlorine dispersion
    emergency gas release
    2d dispersion
    3d dispersion
    CFD
    dyspersja amoniaku
    dyspersja chloru
    uwolnienie awaryjne gazu
    dyspersja 2d
    dyspersja 3d
    Opis:
    The dispersion of the toxic gases due to the natural/industrial accidents can have the tragic consequences. To prevent the effects of these disasters different approaches have been introduced in the literature. In this paper we aimed to prepare the Computational Fluid Dynamics (CFD) the model of emergency escape of toxic gases of different density, e.g. the chlorine and the ammonia. The Aloha and Ansys-Fluent software for multiphase transport description was applied. For 2d simulation the Degadis model was used, while for the 3d approach the multiphase Volume of Fluid model (VOD) was applied. For the reconstruction of atmospheric conditions different air velocity (flowing in one direction) was included according to the Pasquil Stability Class. Moreover, different wind conditions were compared with the windless conditions. The comparison of the dispersion process for two gases with different density, for the same mathematical domain, indicated the different volume concentration in function of the height and the wind velocity. The implications of the spreading pattern from the risk assessment and risk mitigation point of view were discussed. With the increase of height and wind velocity, a decrease of gas concentration for both gases was observed. Moreover, for the ammonia for the windless case, the volume fraction profile was irregular, while for the chlorine the circular profile was observed. With the increase of the wind value, the shape of the ammonia and the chlorine profile became narrower. Similar, as it was for the two-dimensional model wider cloud for the ammonia compared to the chlorine was observed.
    Dyspersja toksycznych gazów w wyniku awarii przemysłowych lub naturalnych katastrof może prowadzić do tragicznych konsekwencji. W celu zapobiegania tego typu zdarzeniom w literaturze fachowej proponowane są różne rozwiązania. Celem niniejszego artykułu było opracowanie matematycznego modelu dla procesu awaryjnego uwolnienia gazów toksycznych, tj. chlor i amoniak. W badaniach analizowano dwa podejścia, tj. dwuwymiarowy i trójwymiarowy opis zjawiska dyspersji gazu. W tym celu zastosowano oprogramowanie Aloha i Ansys-Fluent. Do dwuwymiarowego opisu zjawiska dyspersji gazu wykorzystano model Degadisa, a dla trójwymiarowego opisu zjawiska dyspersji model VOF. W celu rekonstrukcji rzeczywistych warunków atmosferycznych zastosowano różne prędkości przepływu powietrza, zgodnie z klasami stabilności Pasquila. Co więcej, w badaniach uwzględniono również przypadek bez przepływu wiatru. Porównanie procesu dyspersji dwóch gazów o różnej gęstości dla takiej samej domeny obliczeniowej wskazuje na różny układ stężeń analizowanych gazów w funkcji wysokości, a także prędkości wiatru. Zaobserwowano, iż wraz ze wzrostem wysokości i prędkości wiatru malało stężenie obu analizowanych gazów. Co więcej, dla amoniaku w bezwietrznym przypadku profil stężenia miał kształt nieregularny. Wraz ze wzrostem prędkości wiatru kształt profilu stężenia amoniaku i chloru stawał się coraz węższy. Zarówno dla modelu dwuwymiarowego, jak i dla modelu trójwymiarowego zaobserwowano, iż profil stężenia amoniaku był szerszy w porównaniu z profilem stężenia chloru.
    Źródło:
    Zeszyty Naukowe SGSP / Szkoła Główna Służby Pożarniczej; 2018, 1, 66; 23-37
    0239-5223
    Pojawia się w:
    Zeszyty Naukowe SGSP / Szkoła Główna Służby Pożarniczej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A linearization-based hybrid approach for 3D reconstruction of objects in a single image
    Autorzy:
    Kotan, Muhammed
    Öz, Cemil
    Kahraman, Abdulgani
    Powiązania:
    https://bibliotekanauki.pl/articles/2055171.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    3D reconstruction
    shape from shading
    shape recovery
    image comparison
    surface inspection
    rekonstrukcja 3D
    odzyskiwanie kształtu
    porównywanie obrazów
    inspekcja powierzchni
    Opis:
    The shape-from-shading (SFS) technique uses the pattern of shading in images in order to obtain 3D view information. By virtue of their ease of implementation, linearization-based SFS algorithms are frequently used in the literature. In this study, Fourier coefficients of central differences obtained from gray-level images are employed, and two basic linearization-based algorithms are combined. By using the functionally generated surfaces and 3D reconstruction datasets, the hybrid algorithm is compared with linearization-based approaches. Five different evaluation metrics are applied on recovered depth maps and the corresponding gray-level images. The results on defective sample surfaces are also included to show the effect of the algorithm on surface reconstruction. The proposed method can prevent erroneous estimates on object boundaries and produce satisfactory 3D reconstruction results in a low number of iterations.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2021, 31, 3; 501--513
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cortical pattern detection for the developing brain: a 3D vertex labeling and skeletonization approach
    Autorzy:
    Clouchoux, C.
    Kudelski, D.
    Bouyssi-Kobar, M.
    Viseur, S.
    du Plessis, A.
    Evans, A.
    Mari, J.-L.
    Limperopoulos, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/333059.pdf
    Data publikacji:
    2010
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    rozwój mózgu
    ocena krzywizny
    wychwytywanie cech
    sulcal pattern
    brain development
    in-vivo MRI
    cortical surface
    curvature estimation
    morphological operators
    feature extraction
    Opis:
    Normal brain development is associated with expansion and folding of the cerebral cortex in a normal sequence of gyral–sulcal formation. We propose a global approach for measuring the cortical folding pattern of the developing brain. Our method measures geometric features directly on the cortical surface mesh, based on vertex labeling and skeletonization. The resulting extraction provides an accurate representation of global cortical organization. We applied this method to 17 young infants in order to characterize the evolution of cortical organization in the developing brain.
    Źródło:
    Journal of Medical Informatics & Technologies; 2010, 16; 161-166
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An approach to computer-aided reconstruction of museum exhibits
    Autorzy:
    Kęsik, J.
    Montusiewicz, J.
    Kayumov, R
    Powiązania:
    https://bibliotekanauki.pl/articles/102989.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    heritage preservation
    3D scanning
    3D reconstruction
    Opis:
    The article discusses the possibility of using 3D laser and 3D structured light scanning technology to support the restoration of museum objects and presents the concept of applying techniques of 3D scanning and CAD processing to create a model of the missing fragment of a museum object, based on scans of the damaged surface and fragments of the object with a similar shape. The resulting model can be used as a base element in the restoration of the original shape of the artifact, both virtually and in reality. The paper also presents the proposal of a process of reconstructing a missing fragment model of an actual museum object (an exhibit from the Zamoyski Museum in Kozłówka) using the method in question and mobile 3D scanning equipment.
    Źródło:
    Advances in Science and Technology. Research Journal; 2017, 11, 2; 87-94
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interdisciplinary approach to technical education
    Autorzy:
    KROTKÝ, JAN
    KORYTÁŘ, JINDŘICH
    SIMBARTL, PETR
    Powiązania:
    https://bibliotekanauki.pl/articles/456690.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Rzeszowski
    Tematy:
    informal education
    technical education
    new technology
    3D print
    creativity
    STEM
    Opis:
    The authors introduce a realistic concept of innovation in teaching technical subjects at primary schools with regard to sustainable development of industrial society. The concept is based on the published results of an institutional survey carried within six organizations which are concerned with teaching the educational area of Man and the World of Work and preparing teachers for the area. The survey was conducted as a part of the project Erasmus +Activity 1, action strategic partnerships for school education no. 2015-1-SK01-KA201-008942 and as a training of the institute of informal way of teaching at Techmania Technology Center. The innovation is seen especially in interdisciplinary connections between subjects, implementation of new modern technologies in teaching and support of informal education.
    Źródło:
    Edukacja-Technika-Informatyka; 2016, 7, 3; 82-88
    2080-9069
    Pojawia się w:
    Edukacja-Technika-Informatyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Digitally designed casting ring and sprue system - a contemporary approach to the casting process in dentistry
    Autorzy:
    Penchev, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/24200612.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    3D printing
    digital sprue system
    casting
    denture pattern
    dentistry
    drukowanie 3D
    cyfrowy system wlewowy
    odlew
    wzór protezy
    stomatologia
    Opis:
    Purpose: The current paper aims to present a new casting approach in dentistry by eliminating some conventional preliminary procedures and digitalising the process as much as possible. Design/methodology/approach: The experiment uses six digital crown patterns. They are aligned with each other and to the wall of a virtual casting ring. Then a digital sprue system is created. The object alignment and sizes are revised, and the optimal correlation is set. Finally, a single virtual object is created and is 3D printed of light curing acrylic resin suitable for casting, invested, and cast. Findings: The castings that are achieved have good quality and no defects. At the same time, the virtual designing and aligning of the patterns and all the components of the sprue system and casting ring save much time and allows better precision to be achieved. All these facts allow better control of the casting process results, making the process faster, more predictable, and more accurate. Research limitations/implications: The limitations of this study concerns pattern selection. It is well-known that the acrylic resin sublimates and expands massively during a temperature rise, which may cause mould fracture. This obstacle is very representative as solid objects with higher volumes are examined. This may enforce alignment revision or even temperature rate modification. Practical implications: Suggested approach will be very useful for daily dental laboratory practice by optimizing the working time of the dental technician, making the denture production process faster, more predictable, and more accurate. As a result, the process optimizes the working process in dental offices, by allowing shortening the time of each visit and treatment plan terms. Originality/value: Presented approach reveals some new opportunities for dental technicians to substitute the conventional raw stages of sprue system fabrication with digital planning and designing. This allows dental technicians to take advantage of the full potential of digital technologies.
    Źródło:
    Archives of Materials Science and Engineering; 2022, 119, 1; 31--41
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An approach to an intelligent scanning of the machine tool workspace
    Autorzy:
    Marchewka, Lukasz
    Grudzinski, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/1429066.pdf
    Data publikacji:
    2021
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    machine vision
    machine tool
    on-machine measurement
    3D scanning
    Opis:
    Modern 3D scanners can measure the geometry with high accuracy and within a short time. In turn, currently produced CNC machine tools allow for very accurate manufacturing; however, processes beyond the machining cycle remain time-consuming. This paper presents the idea and experimental tests of the scanning system in the CNC machine, which allows to speed up on-machine measurements, align clouds of 3D data points with an accuracy close to that of the machine itself, and finally set the workpiece coordinate system for machining. This modern approach is in line with Industry 4.0, combining the terms of data processing, machine vision, manufacturing automation, and human-machine interfaces. The future implementation of the proposed system as an interchangeable tool will allow performing autonomous measurements, inspection, and supervision of the workspace, without engaging the machine operator. The system calibration and experimental results using the industrial 3D scanner and CNC machine are described.
    Źródło:
    Journal of Machine Engineering; 2021, 21, 2; 60-74
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Building the library of RNA 3D nucleotide conformations using the clustering approach
    Autorzy:
    Zok, T.
    Antczak, M.
    Riedel, M.
    Nebel, D.
    Villmann, T.
    Lukasiak, P.
    Blazewicz, J.
    Szachniuk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/329744.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    RNA nucleotides
    conformer library
    torsion angles
    clustering
    neural gas
    Opis:
    An increasing number of known RNA 3D structures contributes to the recognition of various RNA families and identification of their features. These tasks are based on an analysis of RNA conformations conducted at different levels of detail. On the other hand, the knowledge of native nucleotide conformations is crucial for structure prediction and understanding of RNA folding. However, this knowledge is stored in structural databases in a rather distributed form. Therefore, only automated methods for sampling the space of RNA structures can reveal plausible conformational representatives useful for further analysis. Here, we present a machine learning-based approach to inspect the dataset of RNA three-dimensional structures and to create a library of nucleotide conformers. A median neural gas algorithm is applied to cluster nucleotide structures upon their trigonometric description. The clustering procedure is two-stage: (i) backbone- and (ii) ribose-driven. We show the resulting library that contains RNA nucleotide representatives over the entire data, and we evaluate its quality by computing normal distribution measures and average RMSD between data points as well as the prototype within each cluster.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2015, 25, 3; 689-700
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Band Structure and Magnetic Properties of DO$\text{}_{3}$-Type Fe$\text{}_{3-x}$V$\text{}_{x}$Al Alloys. Super-Cell Approach
    Autorzy:
    Deniszczyk, J.
    Borgieł, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2014414.pdf
    Data publikacji:
    2000-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Eh
    71.20.-b
    72.15.-v
    72.10.-d
    Opis:
    The electronic structure of Fe$\text{}_{3-x}$V$\text{}_{x}$Al alloys was calculated using the super-cell methodology of alloy modeling. The concentration range of x=0.0÷1.0 was investigated. For a concentration of x=0.0625 the energy based analysis reveals that vanadium prefers to replace the Fe atom at sites with the octahedral coordination. It was found that the iron atoms coordinated by the eight nearest-neighbor Fe atoms preserve their high magnetic moment up to a concentration of x=0.9375 even though the average total magnetic moment goes to zero. The relatively high (≃ -1.0μB) negative magnetic moment of V remains constant up to x≃ 0.5. In the concentration range of x=0.75÷0.9375 the gap at ε$\text{}_{F}$ of the minority density of states is observed while the majority density of states displays a sharp peak structure at the Fermi energy. This feature suggests the heavy-fermion behavior of the Fe$\text{}_{2}$VAl compound.
    Źródło:
    Acta Physica Polonica A; 2000, 98, 5; 551-554
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Deterministic Approach to Predicting the Fatigue Crack Growth in the 2024-T3 Aluminum Alloy Under Variable Amplitude Loading
    Autorzy:
    Kocańda, D.
    Torzewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/97779.pdf
    Data publikacji:
    2009
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    aluminum alloy
    fatigue crack growth rate
    microfractographic analysis
    Willenborg retardation model
    Opis:
    The paper presents the attempt to predict fatigue crack growth rate in a component subjected to variable amplitude loading containing overload-underload cycles. For this goal in a deterministic approach the modified Willenborg retardation model was applied. To provide experimental data the research into fatigue crack growth for 2024-T3 aluminum alloy sheet CCT specimens under LHL type block program loading with multiple overload-underload cycles was developed. The microfractographic analysis of fatigue fractures with the use of the transmission electron microscope (TEM) made it possible to trace the effect of block program loading on the crack growth rate. The knowledge of the affection of a particular overloadunderload cycle or a block of these cycles on crack rate on the basis of microfractographic analysis was utilized for assessing the equivalent loading for the LHL block program. The diagrams that presented the crack growth rate both on the surface and inside the aluminum alloy sheet was performed. The crack growth rate inside the sheet was estimated on the basis of the striation spacing analysis.
    Źródło:
    Fatigue of Aircraft Structures; 2009, 1; 102-115
    2081-7738
    2300-7591
    Pojawia się w:
    Fatigue of Aircraft Structures
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A novel approach to visualization of the right ventricular outflow tract
    Autorzy:
    Kaczyńska, Agata Ewa
    Kosiński, Adam
    Kamiński, Rafał
    Zajączkowski, Miłosz Andrzej
    Gleinert-Rożek, Marta
    Nowicka, Ewa
    Powiązania:
    https://bibliotekanauki.pl/articles/895767.pdf
    Data publikacji:
    2019-02-05
    Wydawca:
    Gdański Uniwersytet Medyczny
    Tematy:
    3D models
    cardiac imaging
    silicone molding
    photogrammetry
    right ventricular outflow tract
    Opis:
    Introduction: Nowadays, heart is one of the most demanding organs for imaging procedures. This is related to its irregular shape and complex internal structure. Increased demand for imaging complex cardiac structures has resulted in the development of novel 3D modeling techniques. Not only did the methods of imaging the organs of the living patients developed in recent years, but also new methods of post-mortem analysis. Acquired 3D models have a number of applications, both clinical and educational. Detailed knowledge of the morphology of right ventricular outflow tract (RVOT) is extremely important in terms of cardio-invasive therapeutic procedures. Its significance was noticed during the exploration of the optimal pacing sites in the area of right ventricle. What is more, accurate analysis of the RVOT morphology and spatial structure is also the basis for the treatment of ventricular arrhythmias which foci are located within the outflow tract. The aim of this study was to elaborate the most accurate technique of preparing interior models of the right ventricle and digitizing them to the 3D form. For this purpose we used a silicone molding of the heart cavities with digital photogrammetry.
    Źródło:
    European Journal of Translational and Clinical Medicine; 2018, 1, 2; 36-40
    2657-3148
    2657-3156
    Pojawia się w:
    European Journal of Translational and Clinical Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improving Segmentation of 3D Retina Layers Based on Graph Theory Approach for Low Quality OCT Images
    Autorzy:
    Stankiewicz, A.
    Marciniak, T.
    Dąbrowski, A.
    Stopa, M.
    Rakowicz, P.
    Marciniak, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/221548.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Optical Coherence Tomography (OCT)
    segmentation of retinal layers
    image segmentation
    graph theory
    Opis:
    This paper presents signal processing aspects for automatic segmentation of retinal layers of the human eye. The paper draws attention to the problems that occur during the computer image processing of images obtained with the use of the Spectral Domain Optical Coherence Tomography (SD OCT). Accuracy of the retinal layer segmentation for a set of typical 3D scans with a rather low quality was shown. Some possible ways to improve quality of the final results are pointed out. The experimental studies were performed using the so-called B-scans obtained with the OCT Copernicus HR device.
    Źródło:
    Metrology and Measurement Systems; 2016, 23, 2; 269-280
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Human centric approach to inhomogeneous geospatial data fusion and actualization
    Symbioza mózgu człowieka z komputerem przy sprawdzaniu aktualności heterogenicznych danych geoprzestrzennych
    Autorzy:
    Żarnowski, A.
    Levin, E.
    Skubiev, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/129931.pdf
    Data publikacji:
    2010
    Wydawca:
    Stowarzyszenie Geodetów Polskich
    Tematy:
    computer
    actualization
    geospatial data
    digital image
    3D model
    human eye-movements
    stero measurements
    komputer
    aktualizacja
    dane geoprzestrzenne
    obraz cyfrowy
    model stereoskopowy
    oko ludzkie
    Opis:
    This paper describes a research which attempts to combine the advantages of human analysts and computer automated processing for efficient human-computer symbiosis in geospatial data fusion. Specifically, the experiments performed were related to the analysis of the potential use of inhomogeneous (composed of different sources) stereo pairs for mapping dataset actualization. Inhomogeneous stereo pairs were combined with images of the map to be updated along with actual aerial images of the same territory. The anaglyphic product obtained after image processing of such stereo pairs was demonstrated to human analysts (subjects) and stereo perception of such stereo pairs was achieved. The most interesting finding of this experiment is the fact that some objects existing only on the aerial photo appeared in the inhomogeneous stereo pairs as 3D. This effect is caused by phenomena within the human eye-brain system known as human stereopsis, which is widely deployed in photogrammetry. For the quantitative measurements of the effect obtained an eye-tracking system was deployed. Analysis of human eye-movements (driven by conscious and subconscious brain processes), while perceiving an inhomogeneous stereo dataset, provides a unique opportunity for the human computer symbiosed geospatial systems. There are two potential outcomes of such approach: a) interpretative – analysts’ gaze-fixation zones can help to localize the areas where mapping dataset should be updated b) quantitative processing of eye fixations geometry during stereo model perception allows to transform the virtual 3D model to a geometrical one based on binocular summation measurements deploying eye-tracking.
    W artykule opisano badania, które mają na celu zintegrowanie możliwości ludzkiego umysłu oraz automatyzowanych procesów opracowania dużych zbiorów danych na komputerze do projektowania skutecznego systemu symbiozy człowieka z komputerem przy opracowaniu danych geoprzestrzennych. Eksperymenty w szczególności były związane z analizą możliwości wykorzystywania heterogenicznych (uzyskanych z różnych źródeł) stereogramów dla aktualizacji map i baz danych SIP. Heterogeniczne stereogramy stworzono z mapy rastrowej i aktualnych obrazów cyfrowych. Anaglif uzyskuje się po standardowemu opracowaniu obrazów i wykorzystuje się do stereoskopowego oglądania terenu (model 3D). Najbardziej interesującym fenomenem tego eksperymentu jest fakt, że niektóre obiekty, zarejestrowane tylko na aktualnym obrazie cyfrowym, pojawiły się na heterogenicznych stereogramach w postaci 3D. Ten efekt leży w granicach wzrokowo-mózgowego systemu, znanego jako widzenie stereoskopowe, który szeroko wykorzystuje się w fotogrametrii. Dla oceny parametrów uzyskanego stereomodelu wykorzystano eye-tracking system. Analiza ruchów ludzkiego oka, którymi rządzą świadome oraz podświadome procesy mózgowe, w procesie obserwacji obiektów na heterogenicznym stereogramie – jest źródłem unikalnej informacji dla systemów analizowania danych geoprzestrzennych, zbudowanych na symbiozie ludzkiego umysłu z komputerem.
    Źródło:
    Archiwum Fotogrametrii, Kartografii i Teledetekcji; 2010, 21; 523-533
    2083-2214
    2391-9477
    Pojawia się w:
    Archiwum Fotogrametrii, Kartografii i Teledetekcji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exploring cultural values and sustainability preferences in housing development: A structural equation modeling approach
    Autorzy:
    Aule, Thomas Terna
    Majid, Roshida Binti Abdul
    Jusan, Mahmud Bin Moh’d
    Powiązania:
    https://bibliotekanauki.pl/articles/35561879.pdf
    Data publikacji:
    2022
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    indigenous housing
    cultural values
    sustainable development
    sustainability preferences
    Tiv housing
    Opis:
    The study aimed to establish the relationship between values and people’s preferences for sustainable improvement in Nigeria’s indigenous housing context. The relationship was tested in SEM using ordinal survey data obtained between February and March 2022 with 241 valid samples. The mainstream values were statistically validated using CFA while the relationships were generated in the SEM. Results established a significant relationship between values and the people’s preferences for transformative improvements. The findings provide a foundation for long-term policy formation, practical transformative experimentation, and an empirical foundation for future methodological research.
    Źródło:
    Scientific Review Engineering and Environmental Sciences; 2022, 31, 3; 149-160
    1732-9353
    Pojawia się w:
    Scientific Review Engineering and Environmental Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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