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Artykuły w czasopismach na temat "MGQSM"
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Ma, Xiaolu, Dajun Liu, Yaochuan Wang, Hongming Yin, Haiyang Zhong i Guiqiu Wang. "Propagation of Rectangular Multi-Gaussian Schell-Model Array Beams through Free Space and Non-Kolmogorov Turbulence". Applied Sciences 10, nr 2 (8.01.2020): 450. http://dx.doi.org/10.3390/app10020450.
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In this paper, rectangular multi-Gaussian Schell-model (MGSM) array beams, which consists N×D beams in rectangular symmetry, are first introduced. The analytical expressions of MGSM array beams propagating through free space and non-Kolmogorov turbulence are derived. The propagation properties, such as normalized average intensity and effective beam sizes of MGSM array beams are investigated and analyzed. It is found that the propagation properties of MGSM array beams depend on the parameters of the MGSM source and turbulence. It can also be seen that the beam size of Gaussian beams translated by MGSM array beams will become larger as the total number of terms, M, increases or coherence length, σ , decreases, and the beam in stronger non-Kolmogorov turbulence (larger α and l 0 , or smaller L 0 ) will also have a larger beam size.
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Yin, Tian, Zheng Ma, Hongcan Chen, Qun Luo, Jieyu Zhang i Guangxin Wu. "Phase Equilibria of the Mg-Zn-Sm System in Mg-Rich Corner at 320 °C and 400 °C". Metals 12, nr 10 (20.09.2022): 1553. http://dx.doi.org/10.3390/met12101553.
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To clarify the controversy regarding the phase equilibria in the Mg-rich corner of the Mg-Zn-Sm system, alloys annealed at 320 °C and 400 °C were employed to determine the phase constitution, composition and crystal structure by scanning electron microscopy (SEM), X-ray diffraction (XRD) and transmission electron microscopy (TEM). The maximum solubility of Zn in Mg3Sm was measured to be 49.2 at.% at 400 °C. The Y phase (Mg62Zn31Sm7), only observed in the as-cast alloys, was determined to have an orthorhombic structure with lattice parameters of a = 10.20 Å, b = 11.26 Å and c = 9.64 Å by TEM. The hexagonal compound μ7, identified with lattice parameters of a = 34.62 Å and c = 8.94 Å, was detected during the transformation of the Y phase to the Z phase in the alloys located in the (Mg) + Mg3Sm + Z three-phase region. The phase equilibria (Mg) + Mg41Sm5 + Mg3Sm, Mg + Mg3Sm + Z, (Mg) + Z + liquid and Mg2Zn3 + Z + liquid at 400 °C are confirmed, and the three-phase region (Mg) + Z + MgZn exists in the Mg-Zn side at 320 °C. Subsequently, a self-consistent thermodynamic description was obtained based on the experimental data. Meanwhile, solidification simulation of Y phase formation was conducted by suppressing the stale Z phase, which can reasonably explain the as-cast microstructure of alloys in the Mg-rich corner. The thermodynamic database would be helpful for the further development of Mg-Zn-Sm alloys.
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Zhu, Hui, Yingfang Xue, Xiaofeng Chen, Qiang Li i Hui Li. "V-MGSM: A Multilevel and Grouping Security Virtualization Model for Mobile Internet Service". Mobile Information Systems 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/841292.
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With the pervasiveness of smart phones and the advance of Mobile Internet, more and more Mobile Internet services migrated to the cloud service platform for better user experience. As one of the most indispensable components of the cloud computing infrastructure, virtualization technology has attracted considerable interest recently. However, the flourish of virtualization still faces many challenges in information security. In this paper, we propose a novel architecture, called multilevel and grouping security model for virtualization (V-MGSM), for the security of resources in cloud computing platform. Specifically, to fulfill the balance between information sharing and privacy preservation, the virtual machines (VMs) are divided into diverse groups based on their corresponding entities, and each VM in the same group is assigned to different security level according to security requirements. Besides, the operation between VMs is based on mandatory access control mechanism. Detailed security analysis shows that the proposed V-MGSM can provide a secure communication mechanism for VMs and implement the synchronous updates of the borrowed data. Ultimately, we implement V-MGSM in Xen for experiments, and the results demonstrate that V-MGSM can indeed achieve data security and privacy protection efficiently for Mobile Internet service.
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Neumann, Ruth, i James Guthrie. "Quality Enhancement in Doctoral Education: Developing a More Public Process". Journal of Management & Organization 7, nr 1 (2001): 13–24. http://dx.doi.org/10.1017/s1833367200005277.
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AbstractGovernments play an important role in providing an appropriate national framework and structure for the development of doctoral education. Nevertheless, ultimate responsibility for quality supervision processes lies with institutions, in particular with their departmental units and their policies and processes (DETYA, 1999c). This paper presents a case study of recent developments in the quality enhancement of doctoral supervision in the Macquarie Graduate School of Management (MGSM). In doing so it looks at three areas in particular: (1) the key role of infrastructure support, including the introduction of a code of practice in doctoral supervision; (2) the induction and acculturation processes; and (3) supervision quality, including the selection, development and training of supervisors. The aim of the developments is to make a recognized private process more public and transparent. MGSM currently enrolls a significant number of doctoral students and the enhancement of their doctoral experience is a key priority. The paper concludes by highlighting key issues for future development.
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Neumann, Ruth, i James Guthrie. "Quality Enhancement in Doctoral Education: Developing a More Public Process". Journal of the Australian and New Zealand Academy of Management 7, nr 1 (2001): 13–24. http://dx.doi.org/10.5172/jmo.2001.7.1.13.
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AbstractGovernments play an important role in providing an appropriate national framework and structure for the development of doctoral education. Nevertheless, ultimate responsibility for quality supervision processes lies with institutions, in particular with their departmental units and their policies and processes (DETYA, 1999c). This paper presents a case study of recent developments in the quality enhancement of doctoral supervision in the Macquarie Graduate School of Management (MGSM). In doing so it looks at three areas in particular: (1) the key role of infrastructure support, including the introduction of a code of practice in doctoral supervision; (2) the induction and acculturation processes; and (3) supervision quality, including the selection, development and training of supervisors. The aim of the developments is to make a recognized private process more public and transparent. MGSM currently enrolls a significant number of doctoral students and the enhancement of their doctoral experience is a key priority. The paper concludes by highlighting key issues for future development.
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Zhang, Guiyong, Da Hui, Da Li, Li Zou, Shengchao Jiang i Zhi Zong. "A New TVD Scheme for Gradient Smoothing Method Using Unstructured Grids". International Journal of Computational Methods 17, nr 03 (20.11.2019): 1850132. http://dx.doi.org/10.1142/s0219876218501323.
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An improved [Formula: see text]-factor algorithm for implementing total variation diminishing (TVD) scheme has been proposed for the gradient smoothing method (GSM) using unstructured meshes. Different from the methods using structured meshes, for the methods using unstructured meshes, generally the upwind point cannot be clearly defined. In the present algorithm, the value of upwind point has been successfully approximated for unstructured meshes by using the GSM with different gradient smoothing schemes, including node GSM (nGSM) midpoint GSM (mGSM) and centroid GSM (cGSM). The present method has been used to solve hyperbolic partial differential equation discontinuous problems, where three classical flux limiters (Superbee, Van leer and Minmod) were used. Numerical results indicate that the proposed algorithm based on mGSM and cGSM schemes can avoid the numerical oscillation and reduce the numerical diffusion effectively. Generally the scheme based on cGSM leads to the best performance among the three proposed schemes in terms of accuracy and monotonicity.
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Meng, Fanxiang, Zhimin Sun, Long Yang, Kui Yu i Zongliang Wang. "Assessing the Forecasting Accuracy of a Modified Grey Self-Memory Precipitation Model Considering Scale Effects". Water 14, nr 10 (21.05.2022): 1647. http://dx.doi.org/10.3390/w14101647.
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Precipitation is an important parameter in water resource management, urban flood warning systems, and hydrological analyses. Precipitation forecasting can provide a decision-making basis for relevant organizations, such as those in the agricultural sector and water conservancy departments. In this paper, a modified grey self-memory model (MGSM) was constructed by combining a self-memory function and grey theory. To verify the precision of the model in cases in which measured data are not available in the forecasting stage, a self-test method based on the scale effect in the precipitation forecasting stage was proposed. Ultimately, the model was verified based on three precipitation scales—the annual scale, the crop growth period, and the monthly scale—in the crop growth period from 1961 to 2018 in the Songnen Plain area, Heilongjiang Province. The results showed that the MGSM yielded higher fitting accuracy than the original GM(1,1) and grey self-memory models. Furthermore, the precipitation in the study area was predicted with the MSGM at the three different scales above from 2019 to 2023. The accuracy of forecasting meets the relevant requirements, and the model can be used to forecast precipitation trends at different time scales in the future. The results provide a reference for formulating scientific and rational agricultural water use strategies and guiding agricultural production practices.
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Zhang, Xian, Zhen Wu, Wei Liu i Zi-sheng Chao. "Preparation of pyridine and 3-picoline from acrolein and ammonia with HF/MgZSM-5 catalyst". Catalysis Communications 80 (maj 2016): 10–14. http://dx.doi.org/10.1016/j.catcom.2016.02.011.
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Ciambelli, Paolo, i Pasquale Corbo. "Selective formation of propylene by acid-base catalyzed conversion of methyl alcohol over MgZSM-5". Reaction Kinetics and Catalysis Letters 37, nr 2 (wrzesień 1988): 391–95. http://dx.doi.org/10.1007/bf02062089.
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Zhang, Minghui, Xianlong Liu, Lina Guo, Lin Liu i Yangjian Cai. "Partially Coherent Flat-Topped Beam Generated by an Axicon". Applied Sciences 9, nr 7 (11.04.2019): 1499. http://dx.doi.org/10.3390/app9071499.
Pełny tekst źródłaStreszczenie:
The intensity distribution of a partially coherent beam with a nonconventional correlation function, named the multi-Gaussian Schell-model (MGSM) beam, focused by an axicon was investigated in detail. Our numerical results showed that an optical needle with a flat-topped spatial profile and long focal depth was formed and that we can modulate the focal shift and focal depth of the optical needle by varying the width of the degree of coherence (DOC) and the parameters of the correlation function. The adjustable optical needle can be applied for electron acceleration, particle trapping, fiber coupling and percussion drilling.
Rozprawy doktorskie na temat "MGQSM"
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Hussain, Azham. "Metric based evaluation of mobile devices : mobile goal question metric (mGQM)". Thesis, University of Salford, 2012. http://usir.salford.ac.uk/26720/.
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The constant developments in technology of mobile devices are rapidly increasing the demand for applications on these devices. In October 2010, there were 300,000 applications for iPhone available on iTunes store to be downloaded, and as of January 2011, the application store had over 9.9 billion downloads. Moreover, it is reported that the Blackberry phone has been used by more than 28 million people in 91 countries. Demand for Android phones is also increasing and exceeds analysts' expectations. As a result of the rapid evolution of mobile device development, a new challenge has emerged for application developers; how to improve the usability of mobile applications. This research examines usability issues of mobile devices, and proposes a metric based model which may be used to evaluate applications on mobile devices. A number of evaluation methods and tools are readily available to examine software usability. However usability measures that are specifically intended for mobile devices are very limited indeed. Limitations on current measures to evaluate mobile applications include 1) Their ability to generalize to other domains, 2) The focus on mobile devices instead of the applications and 3) They are not designed to measure applications that use new features on mobile devices. In addition to limited usability measures, evaluation becomes more challenging due to the unique features of mobile devices such as limited bandwidth, unreliability of wireless networks, changing mobile context (e.g., location), small screen size, and limited memory. Hence, this study will propose a conceptual model called mGQM to evaluate mobile applications. The objective of this research is to propose a usability metric that can be used to evaluate mobile applications. The proposed evaluation model is based on a goal-driven method for developing and maintaining a meaningful metrics program, Goal Question Metric (GQM). The proposed metric, mGQM (Mobile Goal Question Metric) consists of usability metrics to assess both quantitative and qualitative measures of mobile phone applications, which other models do not offer. In order to derive a usability metric using the GQM approach, a literature search and review are conducted to obtain usability characteristics, which become the goals to the initial model. The questions are subsequently developed to assess each goal and finally the metrics are derived by refining all the questions into metrics.
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Gunde, Kiran. "Spectral Efficiency Improvement in Spatial Modulation Systems". Thesis, 2019. https://etd.iisc.ac.in/handle/2005/4724.
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A novel energy efficient Multiple-Input-Multiple-Output (MIMO) technique is called Spatial Mod-
ulation (SM). It uses only one radio frequency (RF) chain that reduces the hardware complexity
and cost of the system. The concept of SM is to transmit the data information using modulation
constellation and spatial constellation. It increases the spectral efficiency by keeping only one an-
tenna active per every symbol period. Spatial Multiplexing (SMX) uses equal number of RF chains
with transmit antennas that increases the hardware complexity and cost of the system. SM is
free from Inter Channel Interference (ICI) and Inter Symbol Interference (ISI). Generalised Spatial
Modulation (GSM) and Multiple Active Spatial Modulation (MASM) techniques were developed
to increase the spectral efficiency of SM by increasing the number of RF chains. In GSM, the
same modulation symbol transmits on different antennas hence, it avoids ISI. In MASM, multiple
symbols are transmitted on different antenna con guration. A modi ed version of SM technique
called Quadrature Spatial Modulation (QSM) uses both in-phase and quadrature dimensions to
transmit the data symbol in one time instant. Hence, QSM enhance the spectral efficiency over
SM. Recently, Generalised QSM (GQSM) scheme was developed to increase spectral efficiency by
grouping the transmit antennas according to QSM principle.
We propose a modi ed Generalised QSM (mGQSM) scheme without antenna grouping and
we use multiple RF chains to enhance the spectral efficiency. The proposed scheme provides ex-
tra one bit per channel use (bpcu) spectral efficiency over GQSM scheme with the constraint of
flog2
Nt
Nrf
g 0:5, where f g denotes the fractional part of the decimal value, Nt denotes number
of transmit antennas, and Nrf denotes number of RF chains. In mGQSM system, multiple data
symbols are divided into real and imaginary parts and these parts are transmitted as in-phase and
quadrature components by selecting any possible antenna activation patterns available in mGQSM,
resulting in the choice of antenna activation patterns being doubled in mGQSM compared to GQSM
which yields the extra one bpcu spectral efficiency over GQSM.
Using the ML detection algorithm, we study the performance via numerical simulations using
half code rate convolutional encoder at the transmitter and Viterbi decoding algorithm at the
receiver to estimate the transmitted bits. We compute the computational complexity of ML-
decoding in terms of real valued multiplications and introduce a variant of mGQSM called Reduced
Codebook mGQSM (RC-mGQSM) to reduce the complexity by decreasing the spectral efficiency.
In summary, a novel scheme mGQSM is proposed which improves the spectral efficiency of
known scheme, GQSM by one bpcu.
Części książek na temat "MGQSM"
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Hussain, Azham, Nor Laily Hashim i Nazib Nordin. "mGQM: Evaluation Metric for Mobile and Human Interaction". W HCI International 2014 - Posters’ Extended Abstracts, 42–47. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-07857-1_8.
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