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Wyświetlanie 1-15 z 66
Tytuł:
Peer Review Experiences for MOOC. Development and Testing of a Peer Review System for a Massive Online Course
Autorzy:
Acosta, Enrique Sánchez
Escribano Otero, Juan José
Toletti, Gabriela Christie
Powiązania:
https://bibliotekanauki.pl/articles/2031730.pdf
Data publikacji:
2014-09-30
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
MOOC
evaluation
peer
automatism
massive
Opis:
Although at first MOOC (Massive Open Online Courses) did not use peer reviews, this kind of assessment has increasingly demonstrated the benefits that it can contribute to this type of course by improving the learning process, increasing decisions making abilities, and developing several other academic skills. Other MOOC assessment instruments do not provide students with these opportunities. This paper discusses the results obtained by the most commonly used massive online course platforms, detailing their features and limitations, as well as the experience in the implementation and use of a peer review system for a course of more than 7300 students. This study also comments on how evaluation rubrics are created, along with the final results, and the impact of the inclusion of this type of evaluation in MOOC.
Źródło:
The New Educational Review; 2014, 37; 66-79
1732-6729
Pojawia się w:
The New Educational Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Body Contouring after Massive Weight Loss – Case Report
Autorzy:
Zieliński, Tomasz
Antoszewski, Bogusław
Powiązania:
https://bibliotekanauki.pl/articles/1396893.pdf
Data publikacji:
2012-12-01
Wydawca:
Index Copernicus International
Tematy:
body contouring
plastic surgery
massive weight loss
Opis:
The paper presents a 25-year-old woman who is using a strict diet of 1000 kcal lost 83 kg in 18 months. Despite her young age, weight loss caused numerous cutaneous fatty folds, because her skin was not elastic or resilient enough. The patient undergo a multi-stage surgical treatment aiming to rectify the deformations. This example illustrates the problems of patients having undergone intensive slimming procedures and presents surgical treatment methods that rectify typical deformations in these patients.
Źródło:
Polish Journal of Surgery; 2012, 84, 11; 585-589
0032-373X
2299-2847
Pojawia się w:
Polish Journal of Surgery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The application of massing handling theory for evaluation of the application of wharves and loading facilities in the maritime port
Autorzy:
Matuszak, Z.
Bundz, S.
Jaśkiewicz, M.
Stokłosa, J.
Posuniak, P.
Powiązania:
https://bibliotekanauki.pl/articles/957983.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
port system
massive handling theory
loading on ships
Opis:
This work presents the general characteristics of the port system. It defines sets and functions describing the structure and work of the port. Moreover, it characterizes foundations of the massive handling theory. It provides basic literature information about selected processes and models of the massive handling theory. On the example of a transportation company serving the loading on ships in the port of Szczecin, it shows the loading method. The material loading onto ships was the sodium water glass. There are observation results of operation times comprising the data available to determine parameters of the massive handling theory. Operations covered in the analysis include: the arrival of the ship at the port’s road, waiting for enter the port, passing through the fairway, waiting for loading, loading, determination of the cargo’s weight, preparation of documents and waiting for leaving the port. It presents critical remarks about possibilities of using the data obtained to describe loading cargo on a ship with the use of elements of the massive handling theory.
Źródło:
Advances in Science and Technology. Research Journal; 2016, 10, 31; 281-288
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improved Water-Filling Power Allocation for Energy-Efficient Massive MIMO Downlink Transmissions
Autorzy:
Noor Shahida, M. K.
Nordin, R.
Insmail, M.
Powiązania:
https://bibliotekanauki.pl/articles/227000.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
energy efficiency
Massive MIMO
power allocation
spectral efficiency
Opis:
Energy Efficiency (EE) is becoming increasingly important for wireless communications and has caught more attention due to steadily rising energy costs and environmental concerns. Recently, a new network architecture known as Massive Multiple-Input Multiple-Output (MIMO) has been proposed with the remarkable potential to achieve huge gains in EE with simple linear processing. In this paper, a power allocation algorithm is proposed for EE to achieve the optimal EE in Massive MIMO. Based on the simplified expression, we develop a new algorithm to compute the optimal power allocation algorithm and it has been compared with the existing scheme from the previous literature. An improved water filling algorithm is proposed and embedded in the power allocation algorithm to maximize EE and Spectral Efficiency (SE). The numerical analysis of the simulation results indicates an improvement of 40% in EE and 50% in SE at the downlink transmission, compared to the other existing schemes. Furthermore, the results revealed that SE does not influence the EE enhancement after using the proposed algorithm as the number of Massive MIMO antenna at the Base Station (BS) increases.
Źródło:
International Journal of Electronics and Telecommunications; 2017, 63, 1; 79-84
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
MOOCs, Ethics and the Economics of Higher Education
Autorzy:
McCluskey, Frank B.
Winter, Melanie
Powiązania:
https://bibliotekanauki.pl/articles/425590.pdf
Data publikacji:
2013
Wydawca:
Szkoła Główna Handlowa w Warszawie
Tematy:
MOOC
higher education
course
Massive Open Online Courses
Opis:
The starting point for article is the question: Is there something in that exchange between a single caring professor and motivated student that, while impossible to assess, measure or digitize, is at the very heart of what a university tries to be? The authors discuss the concept of Massively Open Online Classes in the context of Gartner Hype Cycle and explore MOOC ethical implications. The aim of this short article is, according to the authors, not to support or oppose the deployment of MOOCs but to clarify certain ethical presuppositions.
Źródło:
e-mentor. Czasopismo naukowe Szkoły Głównej Handlowej w Warszawie; 2013, 4 (51)
1731-6758
1731-7428
Pojawia się w:
e-mentor. Czasopismo naukowe Szkoły Głównej Handlowej w Warszawie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability and bifurcation analysis of an overhung rotor with electromagnetic actuators
Autorzy:
Przybyłowicz, Piotr M.
Kurnik, Włodzimierz
Powiązania:
https://bibliotekanauki.pl/articles/1839660.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
overhung shaft
massive disc
flutter
bifurcation
magnetic control
Opis:
A rotating system consisting of a slender massless viscoelastic shaft simply supported in rolling bearings and a rigid massive disc mounted to the overhung end of the shaft is considered to study its stabilization against flutter. Instability and transverse vibration occurs due to the internal friction in the shaft. It is shown in the paper that the disc can be stabilized and its bifurcating self-excited vibration can be effectively reduced and modified by contactless radial magnetic actuators, using two alternative control strategies – semi-active utilizing constant or rotation-dependent actuator voltage or fully active with closed-loop state-dependent feedback. The near-critical transverse disc vibration is analyzed using the theory of Hopf bifurcation. Smooth, soft-type self-excitation is presented after activation of the dynamic vibration control which prevents the system from sudden jumps of vibration amplitude near the critical point.
Źródło:
Journal of Theoretical and Applied Mechanics; 2020, 58, 2; 525-539
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A rare and overlooked cause of massive gastrointestinal bleeding: Distal duodenal GIST
Autorzy:
Düzenli, Tolga
Köseoğlu, Hüseyin
Erenler, Behice Hande
Powiązania:
https://bibliotekanauki.pl/articles/2038194.pdf
Data publikacji:
2021-06-30
Wydawca:
Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
Tematy:
duodenum
gastrointestinal stromal tumor
GIST
massive gastrointestinal bleeding
Opis:
Introduction. Gastrointestinal stromal tumors(GIST) are tumors of mesenchymal origin which originate from the walls of gastrointestinal system (GIS) organs. Aim. In this case report we aim to discuss the clinical, labaratory and radiological presentation of distal duodenal GIST as a rare and overlooked cause of life-threatining GIS bleeding. Description of the case. A 76-year-old male patient was presented to the emergency department with massive gastrointestinal bleeding. Computerized tomography revealed a mass soft tissue density of 4x4cm at the level of the 3-4th segment of the duodenum. At the endoscopy, there was a deep ulcer in the proximal part of the 3rd segment of the duodenum with a diameter of 2 cm with a bleeding vessel protruding into the lumen. After endoscopic treatments, biopsies were taken from the edges of the ulcer. Histopathological examination revealed a sheet-like infiltration composed of mildly pleomorphic cells with oval-spindle nuclei and abundant eosinophilic cytoplasm in the duodenal lamina propria, as the patient was diagnosed of GIST. Conclusion. GIST and its clinical, labaratory and radiological presentation should be kept in mind in the approach to massive duodenal GIS bleeding.
Źródło:
European Journal of Clinical and Experimental Medicine; 2021, 2; 189-192
2544-2406
2544-1361
Pojawia się w:
European Journal of Clinical and Experimental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geochemistry and tectonic setting of the volcanic host rocks of VMS mineralisation in the Qezil Dash area, NW Iran : implications for prospecting of Cyprus-type VMS deposits in the Khoy ophiolite
Autorzy:
Imamalipour, Ali
Barak, Samaneh
Powiązania:
https://bibliotekanauki.pl/articles/2058590.pdf
Data publikacji:
2019
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
geochemistry
massive sulphide mineralisation
IAT
ophiolite
Khoy
Iran
Opis:
The uppermost part of the Khoy ophiolite includes submarine volcanic lavas. These rocks are found as two different types including basaltic pillow lavas and andesitic to andesitic basalt massive-sheet lavas known as the Qezil Dash unit. These last rocks host volcanogenic massive sulphide mineralisation (VMS). Concordant small lenticular massive sulphides associated with widespread stockworks, extensive wall rock alteration and simple mineralogical parageneses are characteristic of this mineralisation. The Qezil Dash lavas are characterized by HFSE depletion (such as in Nb, Zr, and Hf) and LILE enrichment, low Yb, Y and Ni contents and low Zr/Hf and Nb/Ta ratios. These rocks have low Ti contents and are of LKT type. These geochemical characteristics can be interpreted as indicating SSZ magmatism and suggesting that the Qezil Dash rocks belong to an early stage of island arc formation. Geochemically, this host rock is comparable with the Lasail unit, part of a volcanic sequence within the Oman ophiolite. In the Troodos and Oman ophiolites VMS mineralisation has occurred at the contacts of MOR-basalt and island arc tholeiite (IAT) lavas, so prospecting for VMS deposits in the Khoy area should be estabilished based on geochemical investigations of the volcanic rocks and recognition of their field boundaries.
Źródło:
Geological Quarterly; 2019, 63, 3; 435--448
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development and infill of Vistulian glacial Lake Gniew (N Poland) : a sedimentological analysis
Autorzy:
Błaszkiewicz, M.
Gruszka, B.
Powiązania:
https://bibliotekanauki.pl/articles/2059705.pdf
Data publikacji:
2005
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Vistulian
glacial lake
sedimentology
glaciolacustrine deposits
massive clay
jökulhlaup
Opis:
A substantial glaciolacustrine unit in northern Poland, between the valleys of the Vistula and Wierzyca rivers, was deposited in glacial Lake Gniew during the climatic amelioration of the Late Vistulian. It covers an area of 35 km2 and has an average thickness of 7m, but locally reaches over 20 m. Four sedimentary facies are distinguished. The silty/clayey rhythmites of facies A are interpreted as varves from the central lake bottom. They represent the initial stage of lake development. Facies B is formed by a single sand layer that is interpreted as a turbidite originating during lake shallowing due to self-drainage. Facies C consists of massive clay with dropstones and dump structures. Two hypothesis regarding its genesis are put forward: the first assumes sedimentation in a shallow basin with a high input of homogenous fine-grained suspended sediment, whereas the second explains the facies as a result of amuddy jökulhlaup, pouring into Lake Gniew and being sourced from another glacial lake; further research is required to interpret this facies reliably. Facies D consists of thick silty/clayey rhythmites that are interpreted as prodeltaic deposits.
Źródło:
Geological Quarterly; 2005, 49, 4; 449--462
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Throughput, Spectral, and Energy Efficiency of 5G Massive MIMO Applications Using Different Linear Precoding Schemes
Autorzy:
Salah, Ibrahim
Rahouma, Kamel Hussein
Hussein, Aziza I.
Mabrook, M. Mourad
Powiązania:
https://bibliotekanauki.pl/articles/2203002.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
throughput
massive MIMO
spectral efficiency
energy efficiency
trade-off
Opis:
On fifth-generation wireless networks, a potential massive MIMO system is used to meet the ever-increasing request for high-traffic data rates, high-resolution streaming media, and cognitive communication. In order to boost the trade-off between energy efficiency (EE), spectral efficiency (SE), and throughput in wireless 5G networks, massive MIMO systems are essential. This paper proposes a strategy for EE 5G optimization utilizing massive MIMO technology. The massive MIMO system architecture would enhance the trade-off between throughput and EE at the optimum number of working antennas. Moreover, the EE-SE tradeoff is adjusted for downlink and uplink massive MIMO systems employing linear precoding techniques such as Multiple -Minimum Mean Square Error (M-MMSE), Regularized Zero Forcing (RZF), Zero Forcing (ZF), and Maximum Ratio (MR). Throughput is increased by adding more antennas at the optimum EE, according to the analysis of simulation findings. Next, utilizing M MMSE instead of RZF and ZF, the suggested trading strategy is enhanced and optimized. The results indicate that M-MMSE provides the best tradeoff between EE and throughput at the determined optimal ratio between active antennas and active users equipment’s (UE).
Źródło:
International Journal of Electronics and Telecommunications; 2023, 69, 1; 185--191
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Propagation and Network Analysis for a Dipole Based Massive Mimo Antenna for 5G Base Stations
Autorzy:
Pushpa, Anita Jones Mary
Chrysolite, Samuelraj
Powiązania:
https://bibliotekanauki.pl/articles/2124749.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
5G antenna
massive MIMO
dipole array
maximum gain
Opis:
In today’s fast-paced world, where everyone/everything is moving towards an online platform, the need to provide high-speed data to all is inevitable. Hence, introducing the emerging 5G technology with orthogonal frequency division multiplexing integrated with massive MIMO technology is the need of the hour. A 640 port Massive MIMO (m-MIMO) antenna with high evenly spread gain and very low delay, along with a practically possible data rate operating in the mm waveband, is proposed for a 5G base station. The individual antenna element consists of a dipole (λ=0.5cm) designed to operate at 57GHz. Placing the cylindrical MIMO antenna array (8x20) facing the four directions forming the m-MIMO antenna (160x4) at the height of 3m from ground level for simulation. Achievement of a maximum gain of 23.14dBi (θ=90▫) and a minimum data rate of 1.44Gbps with -10dB bandwidth of 2.1GHz (256-QAM) approximately a distance of 478m from the 5G Base station. The m-MIMO structure gives an Envelope Correlation Coefficient of 0.015. The propagation analysis is carried out to substantiate the performance of the proposed system based on field strength and received power. Network Analysis for better reception performance is carried out by changing the antenna height placement, altering the down tilt of the antenna array, and sweeping the polarization angle of the antenna array.
Źródło:
International Journal of Electronics and Telecommunications; 2022, 68, 3; 511--517
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of Hybrid Precoder for mm-Wave MIMO System Based on Generalized Triangular Decomposition Method
Autorzy:
Thurpati, Sammaiah
Muthuchidambaranathan, P.
Powiązania:
https://bibliotekanauki.pl/articles/2124753.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
millimeter-wave
mmWave
SVD
GTD
hybrid precoding
massive MIMO
Opis:
Hybrid precoding techniques are lately involved a lot of interest for millimeter-wave (mmWave) massive MIMO systems is due to the cost and power consumption advantages they provide. However, existing hybrid precoding based on the singular value decomposition (SVD) necessitates a difficult bit allocation to fit the varying signal-to-noise ratios (SNRs) of altered sub-channels. In this paper, we propose a generalized triangular decomposition (GTD)-based hybrid precoding to avoid the complicated bit allocation. The development of analog and digital precoders is the reason for the high level of design complexity in analog precoder architecture, which is based on the OMP algorithm, is very non-convex, and so has a high level of complexity. As a result, we suggest using the GTD method to construct hybrid precoding for mmWave mMIMO systems. Simulated studies as various system configurations are used to examine the proposed design. In addition, the archived findings are compared to a hybrid precoding approach in the classic OMP algorithm. The proposed Matrix Decomposition’s simulation results of signal-to-noise ratio vs spectral efficiencies.
Źródło:
International Journal of Electronics and Telecommunications; 2022, 68, 3; 519--525
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Deep Learning-Powered Beamforming for 5G Massive MIMO Systems
Autorzy:
Bendjillali, Ridha Ilyas
Bendelhoum, Mohammed Sofiane
Tadjeddine, Ali Abderrazak
Kamline, Miloud
Powiązania:
https://bibliotekanauki.pl/articles/27312956.pdf
Data publikacji:
2023
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
5G
digital beamforming
hybrid beamforming
massive MIMO
ResNeSt
Opis:
In this study, a ResNeSt-based deep learning approach to beamforming for 5G massive multiple-input multipleoutput (MIMO) systems is presented. The ResNeSt-based deep learning method is harnessed to simplify and optimize the beamforming process, consequently improving performance and efficiency of 5G and beyond communication networks. A study of beamforming capabilities has revealed potential to maximize channel capacity while minimizing interference, thus eliminating inherent limitations of the traditional methods. The proposed model shows superior adaptability to dynamic channel conditions and outperforms traditional techniques across various interference scenarios.
Źródło:
Journal of Telecommunications and Information Technology; 2023, 4; 38--45
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficient Iterative Detection Based on Conjugate Gradient and Successive Over-Relaxation Methods for Uplink Massive MIMO Systems
Autorzy:
Labed, Smail
Aounallah, Naceur
Powiązania:
https://bibliotekanauki.pl/articles/24200730.pdf
Data publikacji:
2023
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
computational complexity
conjugate gradient
massive MIMO
relaxation parameter
signal detection
Opis:
Being a crucial aspect of fifth-generation (5G) mobile communications systems, massively multiple-input multipleoutput (mMIMO) architectures are expected to help achieve the highest key performance indicators. However, the huge numbers of antennas used in such systems make it difficult to determine the inversion of the signal channel matrix relied upon by several detection methods, hence posing a problem with accurate estimation of the symbols sent. In this paper, conjugate gradient (CG) and successive over-relaxation (SOR) methods are selected to construct a new iterative approach that avoids the matrix inversion computation issue. This suggested approach for uplink mMIMO detection is based on a joint cascade structure of both iterative methods. The CG method is first applied and adjusted for the initial solution, followed by the SOR method in the final iterations for terminal computations, resulting in an algorithm with robust performance and low computational complexity. Furthermore, the new hybrid scheme operates based on the relaxation parameter, whose value has a great impact on error performance and, whose optimal determination is necessary. Numerical simulations reveal that the proposed scheme is capable of significantly improving signal detection accuracy with minimum complexity. The simulation results indicated that the proposed detector outperforms CG and SOR detectors, achieves close to optimal performance, requires fewer iterations, and reduces complexity.
Źródło:
Journal of Telecommunications and Information Technology; 2023, 2; 1--9
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Successful MOOC project “IT School” for informatics education on secondary level
Autorzy:
Galwas, B.
Żyławski, A.
Powiązania:
https://bibliotekanauki.pl/articles/91337.pdf
Data publikacji:
2013
Wydawca:
Warszawska Wyższa Szkoła Informatyki
Tematy:
innovation
research projects
IT education
Massive Open Online Courses
MOOC
Opis:
Warsaw School of Computer Science has launched a multi-annual MOOC project “IT School” to prepare and open on-line a number of popular courses and other materials in the area of “basics of computer knowledge” for students of secondary level. The main objective of the project “IT School” is to popularize basic knowledge of computer technology, to encourage young people to study in the field of Information Technology and thus facilitate the study of the core courses. In the framework of Project twelve online courses was prepared and opened with particular care in preparing self-assessment tests, allowing students to check the level of understanding of the learning material after each course (http://www.it-szkola.edu.pl). The final test assesses student knowledge and its completion allows to receive a certificate. The education technology used for preparing the lectures is explained in this paper in details.
Źródło:
Zeszyty Naukowe Warszawskiej Wyższej Szkoły Informatyki; 2013, 7, 10; 39-52
1896-396X
2082-8349
Pojawia się w:
Zeszyty Naukowe Warszawskiej Wyższej Szkoły Informatyki
Dostawca treści:
Biblioteka Nauki
Artykuł
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