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    Wyświetlanie 1-8 z 8
    Tytuł:
    Modified music algorithm for DOA estimation using the a-priori defined unitary matrix
    Autorzy:
    Janowski, T.
    Porosińska, E.
    Zając, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/332526.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    DOA
    unitary matrix
    music algorithm
    Opis:
    The determination of the number of the simultaneously observed objects is an important problem of the MUSIC algorithm. As the result of the covariance matrix eigendecomposition the eingevector and unitary matrix are obtained. The unitary matrix defines the transformation of the measurement vector. Consequently the obtained vector is orthogonal to the noise subspace. The solution of the eigendecomposition problem can be avoided assuming a-priori knowledge of the unitary matrix. Practically, the passive sonar detects the first appeared noisy object. This enable to beforehand define the set of the unitary matrixes exactly matched to the previously determined directions of the signal arrival. The article presents the form of the matrix and features of the measurement vector transformation. The results of the DOA algorithm computer simulation for passive sonar composed of four hydrophones developed in the OBR CTM S.A. are also presented.
    Źródło:
    Hydroacoustics; 2009, 12; 77-82
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hydroacoustics waves direct-of-arrival estimation using music algorithm - simulations results
    Autorzy:
    Żak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/332842.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    music algorithm
    hydroacoustics waves
    hydroacoustics
    Opis:
    Paper presents simulations results of hydroacoustics waves' direction-of-arrival estimation using MUSIC algorithm. Firstly, the research problem is formulated by general description of studied case and release of simplifying assumption. Next the used to direct-of-arrival estimation MUSIC algorithm was discussed. The mathematical formulations, algorithm of calculation and some computational issues were presented. At the end of the paper the simulations results of estimation of direction-of-arrival using MUSIC algorithm for hypothetical situation were presented.
    Źródło:
    Hydroacoustics; 2009, 12; 249-256
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Passive localization for mixed-field moving sources
    Autorzy:
    Gao, C.
    Liu, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/258748.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    underwater positioning
    passive localization
    mixed-field sources
    MUSIC algorithm
    Opis:
    Due to the mobility of underwater equipment, high-precision underwater positioning technology will face two technical challenges: dealing with mixed-field signals composed of near-field signals and far-field signals; adapting to variable component of mixed-field signals considering the mobility of equipment. Under this condition, an effective method based on MUSIC is addressed in this paper. After distinguishing far-field signal subspace from mixed-field signal subspace, estimations of DOAs and powers of far-field sources are carried out. Then the corresponding far-field and noise signal components can be eliminated from the signal subspace. After that, based on path-following algorithm, modified 2D-MUSIC is performed for DOA and range estimations of near-field sources. The performance of the proposed method is verified and compared with the other methods through computer simulations. Reasonable classification of source types and accurate localization estimation can be achieved by using the proposed method.
    Źródło:
    Polish Maritime Research; 2018, S 2; 69-74
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new mutual coupling compensation method for receiving antenna array-based DOA estimation
    Autorzy:
    Parhizgar, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/141040.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    antenna array
    beamforming
    compensation matrix
    DOA estimation
    mutual coupling
    MUSIC algorithm
    Opis:
    Most receiving antenna arrays suffer from the mutual coupling problem between antenna elements, which can critically influence the performance of the array. In this work, a novel and accurate form of compensation matrix is applied to compensate the mutual coupling in a uniform linear array (ULA). This is achieved by applying a new method based on solving a boundary value problem for the whole ULA. In this method, both self and mutual impedances are exploited in an accurate characterization of mutual impedance matrix which results in a perfect mutual coupling compensation method, and hence a very accurate direction of arrival (DOA) estimation. In the new scheme, the compensation matrix is obtained by using the relationship between measured voltage and theoretical coupled voltage based on the MOM. Numerical results show that using DOA estimation algorithms to the decoupled voltage obtained by using this method leads to an excellent performance of DOA estimation with higher accuracy and resolution.
    Źródło:
    Archives of Electrical Engineering; 2018, 67, 2; 419--431
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calculating surface current distribution in antenna array in the presence of mutual coupling by analytical solving of Pocklington’s integral equation
    Autorzy:
    Parhizgar, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/141622.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    antenna array
    current distribution
    DOA estimation
    MUSIC algorithm
    mutual coupling effect
    Pocklington’s integral equation
    Opis:
    In this article, the current distribution of an antenna array in the presence of mutual coupling is calculated analytically by solving Pocklington’s integral equation. Blockpulse and Galerkin’s functions are used for numerical solving of Pocklington’s integral equation. In this work, the surface current distribution can be achieved for an antenna array in receiving mode, with any arbitrary structure and various numbers of elements. In all previous works, the authors have been tried to solve Pocklington’s integral equation for a single half dipole antenna in transmitting mode. Pocklington’s equation is somehow difficult to work with because of the singularity and existence of a sharp peak for a small value of wire’s radius. In order to calculate surface current distribution, for thin wires, singularity part is extracted from the kernel in aforementioned integral. Hence, the kernel is decomposed into singular and nonsingular parts. An inter-element mutual coupling effect between array elements and self-coupling for each element are assumed in this case. The validity of the proposed methodology is tested by numerical simulation results. The accuracy of the proposed method is evaluated by the multiple signal classification (MUSIC) algorithm for different scenarios to direction of arrival (DOA) estimation.
    Źródło:
    Archives of Electrical Engineering; 2018, 67, 1; 65-79
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photoacoustic detection of sentinel lymph node with sensor arrays
    Autorzy:
    Haraszczuk, R.
    Nurzyńska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/333409.pdf
    Data publikacji:
    2011
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    algorytm muzyczny
    wskaźnikowe wykrywanie węzłów chłonnych
    ultradźwięki magnetomotoryczne
    MUSIC algorithm
    sentinel lymph node detection
    magnetomotive ultrasound
    Opis:
    Cancer is one of the diseases which cause the highest death rate in XXI century. However, through years techniques and equipment used to fight with this disease improved there are still many opportunity to get better results. Nowadays, the attention is focused on precise cancerous cells place estimation. It is important for effective cancer treatment, but also it allows diminishing the unwanted effects as destruction of healthy cells. One of the promising techniques in obtaining better spatial and temporal resolution of the internal of the human body is the photoacoustic imaging. Combination of the acoustics, ultrasounds or microwaves by the set of ultrasonic detectors can lead to estimation of the localization of the sources of the waves. The work presents the utilization of the multiple signal classification (MUSIC) algorithm in estimation of angle and distance of microwave or photoacoustic waves sources. The technique presented in the work allows for better prediction of localization of the sources of the detected waves by the sensors array. The proposed application of his technique is detection of sentinel lymph nodes.
    Źródło:
    Journal of Medical Informatics & Technologies; 2011, 17; 233-238
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Piano Dance Pawła Kwapińskiego: nowe drogi czy synteza muzyki fortepianowej?
    New face of piano music — Paweł Kwapiński’s The Piano Dance. Composition technique, ideas and executive problems
    Autorzy:
    Łukaszewski, Marcin
    Powiązania:
    https://bibliotekanauki.pl/articles/521974.pdf
    Data publikacji:
    2018
    Wydawca:
    Akademia Muzyczna im. Stanisława Moniuszki w Gdańsku
    Tematy:
    aleatoryzm,
    algorytm,
    Kwapiński Paweł,
    muzyka fortepianowa,
    poliwersyjność,
    sonoryzm
    aleatoricism,
    algorithm,
    piano music,
    sonority,
    variability of many versions
    Opis:
    Artykuł jest poświęcony utworowi The Piano Dance Pawła Kwapińskiego (ur. 1988), absolwenta kompozycji w gdańskiej Akademii Muzycznej (klasa prof. Andrzeja Dziadka) i UMFC (klasa prof. Pawła Łukaszewskiego) oraz Podyplomowych Studiów Kompozycji (UMFC) w klasie prof. Mariana Borkowskiego. Za utwór ten otrzymał specjalne wyróżnienie na konkursie kompozytorskim w Wiedniu (2014). Dzieło składa się z 11 sekcji, następujących attacca. W niektórych kompozytor dopuścił możliwość wyboru kolejności mniejszych fragmentów przez wykonawcę. Utwór ma przebieg jednokierunkowy, lecz w niektórych sekcjach istnieje możliwość poliwersyjnego wykonania według określonych przez kompozytora sugestii. Dzieło nawiązuje do dwudziestowiecznych środków techniki kompozytorskiej, takich jak aleatoryzm, sonoryzm, dwunastodźwiękowość i atonalność, jednakże nie są one traktowane przez kompozytora w sposób dogmatyczny. Wykorzystuje on ich elementy do wykreowania własnego języka muzycznego. Kompozycja prezentuje wysoki stopień trudności wykonawczych, inicjuje nowe możliwości brzmienia fortepianu po okresie postmodernistycznym.
    The article discusses the work of Paweł Kwapiński (born 1988), composer, graduate of the Academy of Music in Gdańsk (class of Prof. Andrzej Dziadek) and the Fryderyk Chopin University of Music in Warsaw (class of Prof. Paweł Łukaszewski). He also completed postgraduate composition studies in the class of Prof. Marian Borkowski. He received a special award for this piece at the Composer’s Competition in Vienna (2014). The composition consists of 11 sections, following in the attacca sequence. In some cases, the composer allowed for the performer’s choice of the order of the smaller pieces. The composition is unidirectional, but in some sections there is a possibility of a polyphonic performance as suggested by the composer. The work refers to the twentieth-century means of compositional technique, such as aleatoricism, sonorism, twelve-tone technique and atonality, but they are not approached in a dogmatic way by the composer who uses their elements to create his own musical language. The composition presents a high degree of performance difficulty, initiating new possibilities for the piano sound after the postmodern period.
    Źródło:
    Aspekty Muzyki; 2018, 8; 417-439
    2082-6044
    Pojawia się w:
    Aspekty Muzyki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Music Playlist Generation using Facial Expression Analysis and Task Extraction
    Autorzy:
    Sen, A.
    Popat, D.
    Shah, H.
    Kuwor, P.
    Johri, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/908868.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
    Tematy:
    facial expression analysis
    emotion recognition
    feature extraction
    viola jones face detection
    gabor filter
    adaboost
    k-NN algorithm
    task extraction
    music classification
    playlist generation
    Opis:
    In day to day stressful environment of IT Industry, there is a truancy for the appropriate relaxation time for all working professionals. To keep a person stress free, various technical or non-technical stress releasing methods are now being adopted. We can categorize the people working on computers as administrators, programmers, etc. each of whom require varied ways in order to ease themselves. The work pressure and the vexation of any kind for a person can be depicted by their emotions. Facial expressions are the key to analyze the current psychology of the person. In this paper, we discuss a user intuitive smart music player. This player will capture the facial expressions of a person working on the computer and identify the current emotion. Intuitively the music will be played for the user to relax them. The music player will take into account the foreground processes which the person is executing on the computer. Since various sort of music is available to boost one's enthusiasm, taking into consideration the tasks executed on the system by the user and the current emotions they carry, an ideal playlist of songs will be created and played for the person. The person can browse the playlist and modify it to make the system more flexible. This music player will thus allow the working professionals to stay relaxed in spite of their workloads.
    Źródło:
    Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica; 2016, 16, 2; 1-6
    1732-1360
    2083-3628
    Pojawia się w:
    Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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