المؤلفون: Arslan, H., Aulika, I., Sarakovskis, A., Bikse, L., Zubkins, M., Azarov, A., Gabrusenoks, J., Purans, J.

المصدر: Vacuum, Volume 211, May 2023, 111942

مصطلحات موضوعية: Condensed Matter - Materials Science

الوصف: An experimental investigation was conducted to explore spectroscopic and structural characterization of semiconducting yttrium oxide thin film deposited at 623 K (+/- 5K) utilizing reactive pulsed direct current magnetron sputtering. Based on the results obtained from both x-ray diffraction and transmission electron microscope measurements, yttrium monoxide is very likely formed in the transition region between {\beta}-Y2O3 and {\alpha}-Y2O3, and accompanied by the crystalline Y2O3. Resulting from either the low energy separation between 4d and 5s orbitals and/or different spin states of the corresponding orbitals' sublevels, the stability of monoxide is most presumably self-limited by the size of the crystal in thermodynamic terms. This behavior develops a distortion in the structure of the crystal compared to the metal oxide cubic structure and it also effectuates the arrangement in nanocrystalline/amorphous phase. In addition to this, spectroscopic ellipsometry denotes that the semiconducting yttrium oxide has the dominant, mostly amorphous, formation character over crystalline Y2O3. Our purpose, by means of the current findings, is to advance the understanding of formation kinetics/conditions of yttrium with an unusual valency (2+).

الوصول الحر: http://arxiv.org/abs/2305.06757Test

المؤلفون: Zubkins, M., Aulika, I., Strods, E., Vibornijs, V., Bikse, L., Sarakovskis, A., Chikvaidze, G., Gabrusenoks, J., Arslan, H., Purans, J.

المصدر: Vacuum 203 (2022) 111218

مصطلحات موضوعية: Condensed Matter - Materials Science, Physics - Applied Physics

الوصف: The synthesis of the photochromic YHO films is based on the oxidation of deposited yttrium hydride in ambient conditions. The actual state of the films during the deposition process, which is influenced by the deposition pressure and the oxidation caused by the residual gases, is not completely known. We report on the YHxOy thin films deposited by reactive pulsed-DC magnetron sputtering. Since the visible light transmittance is closely related to the phase and chemical composition of the films, in-situ transmittance measurements during and after deposition are performed. Ex-situ spectroscopic ellipsometry is used to determine the optical constants of YHxOy throughout the film thickness. In order to obtain metallic YH2-x films, the densest possible structure with a high deposition rate is required, otherwise the films could already be partially transparent during the deposition. The transmittance is higher if deposition pressure is increased. This is because of the oxidation promoted by more porous growth of the microstructure that is observed at the surface and cross-section images of the films. The films exhibit a refractive index gradient perpendicular to the substrate surface, which is related to the porosity and variation of the chemical composition.
Comment: 37 pages, 11 figures

الوصول الحر: http://arxiv.org/abs/2206.14644Test

المؤلفون: Yılmaz A.İ., Pekcan S., Eyüboğlu T.Ş., Hangül M., Arslan H., Kılınç A.A., Çokuğraş H.

مصطلحات موضوعية: Children, Cystic fibrosis, Refugee, War

الوصف: Since the outbreak of the Syrian civil war in 2011, the population of Arab refugees in Turkey has rapidly increased. While cystic fibrosis (CF) is believed to be rare among Arabs, recent studies suggest it is underdiagnosed. This study aims to present the demographic, clinical, and genetic characteristics of CF patients among Arab refugees in Turkey. Additionally, a comparison is made between the findings in the National CF Registry 2021 in Turkey (NCFRT) and the refugee CF patient group. The study included refugee patients between the ages of 0 and 18 years who were diagnosed with CF and received ongoing care at pediatric pulmonology centers from March 2011 to March 2021. The study examined demographic information, age at diagnosis, age of diagnosis of patients through CF newborn screening (NBS), presenting symptoms, CF transmembrane conductance regulator (CFTR) mutation test results, sputum culture results, weight, height, and body mass index (BMI) z score. Their results were compared with the NCFRT results. The study included 14 pediatric pulmonology centers and 87 patients, consisting of 46 (52.9%) boys and 41 (47.1%) girls. All of the patients were Arab refugees, with 80 (92%) being Syrian. All the patients were diagnosed in Turkey. The median age at diagnosis of patients was 22.33 (interquartile range, 1–258) months. The median age of diagnosis of patients through NBS was 4.2 (interquartile range, 1–12) months. The median age of older patients, who were unable to be included in the NBS program, was 32.3 (interquartile range, 3–258) months. Parental consanguinity was observed in 52 (59.7%) patients. The mutation that was most frequently found was F508del, which accounted for 22.2% of the cases. It was present in 20 patients, constituting 32 out of the total 144 alleles. There was a large number of genetic variations. CFTR genotyping could not be conducted for 12 patients. These patients had high sweat tests, and their genetic mutations could not be determined due to a lack of data. Compared to NCFRT, ...

العلاقة: European Journal of Pediatrics; Makale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı; https://doi.org/10.1007/s00431-024-05431-8Test; https://hdl.handle.net/20.500.12831/19453Test; 2-s2.0-85182991146

الإتاحة: https://doi.org/10.1007/s00431-024-05431-8Test
https://doi.org/20.500.12831/19453Test
https://hdl.handle.net/20.500.12831/19453Test

المؤلفون: Furqan, H. M., Aygul, M. A., Nazzal, M., Arslan, H.

المصدر: J Wireless Com Network 2020, 141 (2020)

مصطلحات موضوعية: Electrical Engineering and Systems Science - Signal Processing

الوصف: Cognitive radio is an intelligent and adaptive radio that improves the utilization of the spectrum by its opportunistic sharing. However, it is inherently vulnerable to primary user emulation and jamming attacks that degrade the spectrum utilization. In this paper, an algorithm for the detection of primary user emulation and jamming attacks in cognitive radio is proposed. The proposed algorithm is based on the sparse coding of the compressed received signal over a channel-dependent dictionary. More specifically, the convergence patterns in sparse coding according to such a dictionary are used to distinguish between a spectrum hole, a legitimate primary user, and an emulator or a jammer. The process of decision-making is carried out as a machine learning-based classification operation. Extensive numerical experiments show the effectiveness of the proposed algorithm in detecting the aforementioned attacks with high success rates. This is validated in terms of the confusion matrix quality metric. Besides, the proposed algorithm is shown to be superior to energy detection-based machine learning techniques in terms of receiver operating characteristics curves and the areas under these curves
Comment: Accepted for publication in EURASIP Journal on Wireless Communications and Networking, TO BE APPEAR: Journal on Wireless Communications and Networking, 2020

الوصول الحر: http://arxiv.org/abs/2006.09231Test

المؤلفون: Demir, Ali Fatih, Elkourdi, M., Ibrahim, M., Arslan, H.

المصدر: 5G Networks: Fundamental Requirements, Enabling Technologies, and Operations Management, John Wiley & Sons, Inc., Sept. 2018, ch. 2, pp. 51-76

مصطلحات موضوعية: Electrical Engineering and Systems Science - Signal Processing

الوصف: 5G is envisioned to improve major key performance indicators (KPIs), such as peak data rate, spectral efficiency, power consumption, complexity, connection density, latency, and mobility. This chapter aims to provide a complete picture of the ongoing 5G waveform discussions and overviews the major candidates. It provides a brief description of the waveform and reveals the 5G use cases and waveform design requirements. The chapter presents the main features of cyclic prefix-orthogonal frequency-division multiplexing (CP-OFDM) that is deployed in 4G LTE systems. CP-OFDM is the baseline of the 5G waveform discussions since the performance of a new waveform is usually compared with it. The chapter examines the essential characteristics of the major waveform candidates along with the related advantages and disadvantages. It summarizes and compares the key features of different waveforms.
Comment: 22 pages, 21 figures, 2 tables; accepted version (The URL for the final version: https://onlinelibrary.wiley.com/doi/abs/10.1002/9781119333142.ch2Test)

الوصول الحر: http://arxiv.org/abs/1902.05999Test

المؤلفون: Demir, Ali Fatih, Abbasi, Q. H., Ankarali, Z. E., Alomainy, A., Qaraqe, K., Serpedin, E., Arslan, H.

المصدر: IEEE Journal of Biomedical and Health Informatics, vol. 21, no. 5, pp. 1254-1262, Sept. 2017

مصطلحات موضوعية: Electrical Engineering and Systems Science - Signal Processing

الوصف: In vivo wireless body area networks (WBANs) and their associated technologies are shaping the future of healthcare by providing continuous health monitoring and noninvasive surgical capabilities, in addition to remote diagnostic and treatment of diseases. To fully exploit the potential of such devices, it is necessary to characterize the communication channel which will help to build reliable and high-performance communication systems. This paper presents an in vivo wireless communication channel characterization for male torso both numerically and experimentally (on a human cadaver) considering various organs at 915 MHz and 2.4 GHz. A statistical path loss (PL) model is introduced, and the anatomical region-specific parameters are provided. It is found that the mean PL in dB scale exhibits a linear decaying characteristic rather than an exponential decaying profile inside the body, and the power decay rate is approximately twice at 2.4 GHz as compared to 915 MHz. Moreover, the variance of shadowing increases significantly as the in vivo antenna is placed deeper inside the body since the main scatterers are present in the vicinity of the antenna. Multipath propagation characteristics are also investigated to facilitate proper waveform designs in the future wireless healthcare systems, and a root-mean-square (RMS) delay spread of 2.76 ns is observed at 5 cm depth. Results show that the in vivo channel exhibit different characteristics than the classical communication channels, and location dependency is very critical for accurate, reliable, and energy-efficient link budget calculations.
Comment: 9 pages, 12 figures, 6 tables; accepted version (The URL for the final version: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=7593228&isnumber=8023990Test )

الوصول الحر: http://arxiv.org/abs/1902.05990Test

المؤلفون: Arslan, H., Akbulut, U., Cetin, A., Ä°plikçi, Serdar

مصطلحات موضوعية: Alarm Data Analysis, Alarm Management, Association Rule Mining, High Average-Utility Itemset Mining, Alarm systems, Data mining, Information management, Mobile telecommunication systems, Wireless networks, Alarm data analyse, Average utilities, Itemset, Mobile network operators, Network data, Network operations centers, Telecommunications networks, Utility itemsets minings, Association rules

الوصف: 2023 International Technical Conference on Circuits/Systems, Computers, and Communications, ITC-CSCC 2023 -- 25 June 2023 through 28 June 2023 -- 191750 ; Mining huge number of alarm events data collected at the network operations center of a mobile network operator has become a challenging problem in the mobile communication area due to the fact that alarm events are heterogeneous and that they have different significance levels and may occur more than once in a certain time-window. In this study, the High Average-Utility Itemset Mining (HAUIM) approach is adopted to identify high average-utility itemsets in the alarm events data collected at the network operations center of Turkcell, which is a major mobile network operator in Turkiye. Moreover, a new interestingness measure has been proposed to obtain association rules between high average-utility itemsets. Experimental results have shown the efficiency of the proposed system with respect to compression and prediction performances. © 2023 IEEE. ; 5210123; Türkiye Bilimsel ve Teknolojik AraÅŸtırma Kurumu, TÃœBÄ°TAK ; This work is supported by the Scientific and Technological Research Council of Turkiye (TUBITAK) and Turkcell Telecommunication Services Inc. under the University-Industry Collaboration Program with the project number 5210123.

العلاقة: 2023 International Technical Conference on Circuits/Systems, Computers, and Communications, ITC-CSCC 2023; Konferans Öğesi - Uluslararası - Kurum Öğretim Elemanı; https://doi.org/10.1109/ITC-CSCC58803.2023.10212557Test; https://hdl.handle.net/11499/52867Test; 2-s2.0-85169819439

الإتاحة: https://doi.org/10.1109/ITC-CSCC58803.2023.10212557Test
https://hdl.handle.net/11499/52867Test

المؤلفون: Saba Rana, Liaqat Hussain, Uzma Saleem, Muhammad Asif, Arslan H. Lodhi, Muhammad Q. Barkat, Muhammad Riaz, Alina Jamil

المصدر: Dose-Response, Vol 21 (2023)

مصطلحات موضوعية: Therapeutics. Pharmacology, RM1-950

الوصف: Background Polycystic ovarian syndrome (PCOS) is an endocrine metabolic disorder of women. Purpose This study aimed to explore the potential of aqueous extract of Garcinia cambogia Desr. (AEGC) in PCOS. Methodology The HPLC was used to determine the phytoconstituents present in Garcinia cambogia. Thirty adult female albino rats were divided into 6 groups: Normal control (NC) disease Control (PCOS; letrozole 1 mg/kg), plant extract (AEGC 100, 300, 500 mg/kg) and standard (metformin; 20 mg/kg). Disease was confirmed by vaginal smear cytology. After 10 weeks, animals were euthanized, ovaries dissected for histopathology, blood collected for hormonal and biochemical analysis. Results HPLC analysis showed the presence of phenolic contents; chlorogenic acid, gallic acid, coumaric acid while flavonoid contents were quercetin, kaempferol, and rutin. After treatment, there was dose dependent reduction of weight, ovarian cysts, improvement of follicle growth. DPPH radical scavenging percentage was 67.89%. Hormonal analysis showed a significant improvement ( P < .05) in follicle stimulating hormone (FSH), estrogen, and progesterone while a reduction in testosterone, luteinizing hormone (LH) and insulin level. Antioxidant enzymatic markers were significantly ( P < .05) increased. Lipid profile and LFTs were also improved. Conclusions The study validated the potential of Garcinia cambogia in the management of PCOS.

وصف الملف: electronic resource

العلاقة: https://doaj.org/toc/1559-3258Test

الوصول الحر: https://doaj.org/article/ce71746cc15a41d5898c26e379b58ec0Test

المؤلفون: Rana, Saba, Hussain, Liaqat, Saleem, Uzma, Asif, Muhammad, Lodhi, Arslan H., Barkat, Muhammad Q., Riaz, Muhammad, Jamil, Alina

المصدر: Dose-Response ; volume 21, issue 2, page 155932582311693 ; ISSN 1559-3258 1559-3258

مصطلحات موضوعية: Chemical Health and Safety, Health, Toxicology and Mutagenesis, Public Health, Environmental and Occupational Health, Toxicology

الوصف: Background Polycystic ovarian syndrome (PCOS) is an endocrine metabolic disorder of women. Purpose This study aimed to explore the potential of aqueous extract of Garcinia cambogia Desr. (AEGC) in PCOS. Methodology The HPLC was used to determine the phytoconstituents present in Garcinia cambogia. Thirty adult female albino rats were divided into 6 groups: Normal control (NC) disease Control (PCOS; letrozole 1 mg/kg), plant extract (AEGC 100, 300, 500 mg/kg) and standard (metformin; 20 mg/kg). Disease was confirmed by vaginal smear cytology. After 10 weeks, animals were euthanized, ovaries dissected for histopathology, blood collected for hormonal and biochemical analysis. Results HPLC analysis showed the presence of phenolic contents; chlorogenic acid, gallic acid, coumaric acid while flavonoid contents were quercetin, kaempferol, and rutin. After treatment, there was dose dependent reduction of weight, ovarian cysts, improvement of follicle growth. DPPH radical scavenging percentage was 67.89%. Hormonal analysis showed a significant improvement ( P < .05) in follicle stimulating hormone (FSH), estrogen, and progesterone while a reduction in testosterone, luteinizing hormone (LH) and insulin level. Antioxidant enzymatic markers were significantly ( P < .05) increased. Lipid profile and LFTs were also improved. Conclusions The study validated the potential of Garcinia cambogia in the management of PCOS.

الإتاحة: https://doi.org/10.1177/15593258231169381Test

المؤلفون: Derya Arslan, H., Ergener, Hilal

المصدر: Ain Shams Engineering Journal ; volume 14, issue 9, page 102063 ; ISSN 2090-4479

مصطلحات موضوعية: General Engineering

الإتاحة: https://doi.org/10.1016/j.asej.2022.102063Test
https://api.elsevier.com/content/article/PII:S2090447922003744?httpAccept=text/xmlTest
https://api.elsevier.com/content/article/PII:S2090447922003744?httpAccept=text/plainTest