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Wyszukujesz frazę "Sharma, Pooja" wg kryterium: Autor


Tytuł:
Examining the Predictive Capability of Advanced Software Fault Prediction Models – An Experimental Investigation Using Combination Metrics
Autorzy:
Sharma, Pooja
Sangal, Amrit Lal
Tematy:
process product
process metrics
classifiers
ensemble design
software
fault prediction
software quality
Pokaż więcej
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:
https://bibliotekanauki.pl/articles/2060915.pdf  Link otwiera się w nowym oknie
Opis:
Background: Fault prediction is a key problem in software engineering domain. In recent years, an increasing interest in exploiting machine learning techniques to make informed decisions to improve software quality based on available data has been observed. Aim: The study aims to build and examine the predictive capability of advanced fault prediction models based on product and process metrics by using machine learning classifiers and ensemble design. Method: Authors developed a methodological framework, consisting of three phases i.e., (i) metrics identification (ii) experimentation using base ML classifiers and ensemble design (iii) evaluating performance and cost sensitiveness. The study has been conducted on 32 projects from the PROMISE, BUG, and JIRA repositories. Result: The results shows that advanced fault prediction models built using ensemble methods show an overall median of $F$-score ranging between 76.50% and 87.34% and the ROC(AUC) between 77.09% and 84.05% with better predictive capability and cost sensitiveness. Also, non-parametric tests have been applied to test the statistical significance of the classifiers. Conclusion: The proposed advanced models have performed impressively well for inter project fault prediction for projects from PROMISE, BUG, and JIRA repositories.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonmaximal entanglement of photons from positron-electron annihilation demonstrated using a plastic PET scanner
Autorzy:
Curceanu, Catalina
Chug, Neha
Kapłon, Łukasz
Niedźwiecki, Szymon
Coussat, Aurélien
Czerwiński, Eryk
Gorgol, Marek
Skurzok, Magdalena
Tayefi Ardebili, Keyvan
Mryka, Wiktor
Kumar, Deepak
Beyene, Ermias Yitayew
Kacprzak, Krzysztof
Dulski, Kamil
Lisowski, Filip
Tanty, Pooja
Stępień, Ewa
Lisowski, Edward
Jasińska, Bożena
Das, Manish
Valsan Eliyan, Kavya
Parzych, Szymon
Sharma, Sushil
Kaplanoglu, Muhammed
Rädler, Martin
Moskal, Paweł
Kozik, Tomasz
Perez del Rio, Elena
Opis:
In state-of-the-art positron emission tomography (PET), information about annihilation photon polarization is unavailable. Here, we present a PET scanner built from plastic scintillators, where annihilation photons primarily interact via the Compton effect, providing information about both photon polarization and propagation direction. Using this plastic-based PET, we determined the distribution of the relative angle between polarization planes of photons from positron-electron annihilation in a porous polymer. The amplitude of the observed distribution is smaller than predicted for maximally quantum entangled two-photon states but larger than expected for separable photons. This result can be well explained by assuming that photons from pick-off annihilation are not entangled, while photons from direct and parapositronium annihilations are maximally entangled. Our result indicates that the degree of entanglement depends on the annihilation mechanism in matter, opening avenues for exploring polarization correlations in PET as a diagnostic indicator.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Quality control of plastic scintillators for the total-body J-PET scanner
Autorzy:
Chug, Neha
Kapłon, Łukasz
Mędrala-Sowa, Justyna
Niedźwiecki, Szymon
Czerwiński, Eryk
Skurzok, Magdalena
Tayefi Ardebili, Keyvan
Mryka, Wiktor
Kumar, Deepak
Moskal, Gabriel
Kacprzak, Krzysztof
Korcyl, Grzegorz
Kubat, Karol
Pandey, Piyush
Beyene, Ermias
Lisowski, Filip
Tanty, Pooja
Stępień, Ewa
Curceanu, C.
Lisowski, Edward
Kunimmal Venadan, Anoop
Kaplanoglu, T.
Das, Manish
Valsan Eliyan, Kavya
Parzych, Szymon
Sharma, Sushil
Moskal, Paweł
Perez del Rio, Elena
Opis:
The construction of the total-body Jagiellonian positron emission tomography scanner requires component verification before detector assembly. The purpose of this research is to verify the quality of BC-408 plastic scintillators with dimensions 6 mm × 30 mm × 330 mm. The scintillators were inspected for optical and mechanical defects and all dimensions were measured. Scratches, mechanically damaged corners and edges, as well as encapsulated dust and fibers within the scintillators, were identified under ceiling lamp illumination. Line defects on the as-cast surfaces were easily visible in a plane polariscope setup consisting of crossed horizontal and vertical polarizer foils. The transmittance at the wavelength of maximum emission through 6 mm thick scintillator samples and the technical attenuation length along 330 mm long scintillator samples were measured on a linear CCD array spectrometer for randomly selected scintillators from each delivered batch. Selected properties of the emission spectra, such as their FWHM and the values of the emission maxima as a function of the distance between the excitation point and the spectrometer fiber, were measured. Additionally, the scintillators optical homogeneity was measured on a light transfer setup consisting of an LED and photodiode matrix. The majority of the obtained plastic scintillators meets the transparency criteria and falls within the dimensional tolerances.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Nanoporosity imaging by positronium lifetime tomography
Autorzy:
Chug, Neha
Kapłon, Łukasz
Mędrala-Sowa, Justyna
Niedźwiecki, Szymon
Czerwiński, Eryk
Skurzok, Magdalena
Tayefi Ardebili, Keyvan
Kumar, Deepak
Kacprzak, Krzysztof
Korcyl, Grzegorz
Gorgol, M.
Kubat, Karol
Lisowski, F.
Dulski, Kamil
Pandey, Piyush
Lisowski, E.
Beyene, Ermias
Jasińska, B.
Tanty, Pooja
Stępień, Ewa
Curceanu, C.
Das, Manish
Parzych, Szymon
Sharma, Sushil
Rädler, Martin
Moskal, Paweł
Kozik, Tomasz
Perez del Rio, Elena
Opis:
Positron Annihilation Lifetime Spectroscopy (PALS) is a well-established non-destructive technique used for nanostructural characterization of porous materials. It is based on the annihilation of a positron and an electron. Mean positron lifetime in the material depends on the free voids size and molecular environment, allowing the study of porosity and structural transitions in the nanometer scale. We have developed a novel method enabling spatially resolved PALS, thus providing tomography of nanostructural characterization of an extended object. Correlating space (position) and structural (lifetime) information brings new insight in materials studies, especially in the characterization of the purity and pore distribution. For the first time, a porosity image using stationary positron sources for the simultaneous measurement of the porous polymers XAD4, silica aerogel powder IC3100, and polyvinyl toluene scintillator PVT by the J-PET (Jagiellonian Positron Emission Tomography) system is demonstrated.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Development of correction techniques for the J-PET Scanner
Autorzy:
Curceanu, Catalina
Khreptak, Aleksander
Niedźwiecki, Szymon
Chug, Neha
Mędrala-Sowa, Justyna
Sowa-Staszczak, Anna
Badawi, Ramsey
Czerwiński, Eryk
Skurzok, Magdalena
Głowa, Bogusław
Spencer, Benjamin A.
Tayefi Ardebili, Keyvan
Mryka, Wiktor
Kumar, Deepak
Beyene, Ermias Yitayew
Kacprzak, Krzysztof
Korcyl, Grzegorz
Kubat, Karol
Pandey, Piyush
Lisowski, Filip
Tanty, Pooja
Opalińska, Marta
Bayerlein, Reimund
Stępień, Ewa
Lisowski, Edward
Kunimmal Venadan, Anoop
Das, Manish
Valsan Eliyan, Kavya
Parzych, Szymon
Sharma, Sushil
Hubalewska-Dydejczyk, Alicja
Kaplanoglu, Muhammed
Moyo, Simbarashe
Kasperska, Kamila
Moskal, Paweł
Rädler, Martin
Opis:
Objective: Positron emission tomography (PET) is a widely used medical imaging technique that allows for non-invasive imaging of metabolic processes. However, traditional PET scanners rely on costly inorganic scintillators that limit their accessibility, especially in light of emerging long axial field-of-view devices. The modular J-PET scanner, an innovative alternative, uses 50-cm-long plastic scintillator strips, offering a cost-effective and modular solution. In this study we develop and assess the PET data correction techniques required for quantitative image reconstruction. Methods: We present methods for attenuation correction, random coincidence correction using the delayed time window (DTW) technique and scatter correction based on Monte Carlo simulations. Phantom studies using the NEMA IQ phantom were performed to qualitatively evaluate these corrections. Results: The results demonstrate that our implemented corrections for attenuation and random and scattered coincidences successfully improve the uniformity of tracer distribution in homogenous volumes and significantly reduce undesired activity in cold regions. Despite limitations in sensitivity and axial resolution, the applied correction techniques effectively enhance image quality, providing promising results for future applications. Conclusions: These findings highlight the potential of the modular J-PET system to offer affordable PET imaging and to pave the way for a total-body PET scanner based on plastic scintillators. Future work will focus on quantitative validation and the implementation of these corrections for human subject imaging.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Studies of CPT symmetry in positronium decays with the 192 plastic strip J-PET detector
Autorzy:
Hajduga, J.
Bass, Steven D.
Khreptak, Aleksander
Tiwari, Satyam
Czerwiński, Eryk
Szumlak, T.
Stępień, Ewa
Chug, Neha
Curceanu, C.
Korcyl, Grzegorz
Valsan Eliyan, Kavya
Beyene, Ermias
Rädler, Martin
Kierys, A.
Mryka, Wiktor
Lisowski, E.
Pandey, Piyush
Kunimmal Venadan, Anoop
Mędrala-Sowa, Justyna
Kumar, Deepak
Niedźwiecki, Szymon
Tanty, Pooja
Gorgol, M.
Sienkiewicz, A.
Jasińska, B.
Kubat, Karol
Sharma, Sushil
Moskal, Paweł
Kapłon, Łukasz
Kacprzak, Krzysztof
Skurzok, Magdalena
Perez del Rio, Elena
Parzych, Szymon
Rachwał, B.
Lisowski, F.
Kasperska, Kamila
Jalali, Sharareh
Porcelli, Alessio
Tayefi Ardebili, Keyvan
Das, Manish
Moyo, Simbarashe
Kaplanoglu, Muhammed Tevfik
Kozik, Tomasz
Opis:
A direct test of the CPT symmetry is performed for the electromagnetic decays of ortho-positronium using the Jagiellonian positron emission tomograph (J-PET). We present the precise measurement of the CPT-sensitive angular correlation entailing the positronium spin and the momenta of its annihilation photons, surpassing previous studies utilizing the same detection system. Positrons originating from a $^{22}$Na source are emitted from the detector’s center and subsequently form positronium atoms within the spherical chamber covered with porous material. Reconstruction of annihilation locations using the 192-strip J-PET detector makes it possible to determine the positronium emission direction, which defines the quantization axis along which positronium is polarized, without the application of external magnetic fields. The measurements were performed in total for 356 days resulting in an identification of 47.8 $\times$ 10$^{6}$ events with ortho-positronium decays into three photons. The results are consistent with the exactness of CPT symmetry with measured asymmetry amplitude -0.00029 ± 0.00022 (stat.) and with statistical error four times smaller than the previous best measurement.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł

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