To see the other types of publications on this topic, follow the link: Multi-core configuration.
Journal articles on the topic 'Multi-core configuration'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 journal articles for your research on the topic 'Multi-core configuration.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.
1
Zhang, Sheng Wen, and Xuan Peng Wang. "Configuration of Multi-Tenant Applications." Advanced Materials Research 219-220 (March 2011): 1182–85. http://dx.doi.org/10.4028/www.scientific.net/amr.219-220.1182.
Full textAbstract:
SaaS (Software as a Service) application mode came into being along with the expansion and convenient of the network platform, and its core lies in Multi-Tenant (multi-tenant) application. Multi-Tenant Application under the SaaS model makes software applications efficient and convenient, more importantly, tenants can greatly reduce their software development costs, hardware acquisition costs, training costs, and upgrade and maintenance costs by using the application system, which virtually eased business cost pressures and makes more focus on business development. This paper elaborates the personalized needs of tenants for Multi-Tenant Applications mainly from the three aspects: data, function, and interface. With the configuration of data, function and interface, Multi-tenant applications will become better.
2
Fan, Kaijie, Biagio Cosenza, and Ben Juurlink. "Accurate Energy and Performance Prediction for Frequency-Scaled GPU Kernels." Computation 8, no. 2 (April 27, 2020): 37. http://dx.doi.org/10.3390/computation8020037.
Full textAbstract:
Energy optimization is an increasingly important aspect of today’s high-performance computing applications. In particular, dynamic voltage and frequency scaling (DVFS) has become a widely adopted solution to balance performance and energy consumption, and hardware vendors provide management libraries that allow the programmer to change both memory and core frequencies manually to minimize energy consumption while maximizing performance. This article focuses on modeling the energy consumption and speedup of GPU applications while using different frequency configurations. The task is not straightforward, because of the large set of possible and uniformly distributed configurations and because of the multi-objective nature of the problem, which minimizes energy consumption and maximizes performance. This article proposes a machine learning-based method to predict the best core and memory frequency configurations on GPUs for an input OpenCL kernel. The method is based on two models for speedup and normalized energy predictions over the default frequency configuration. Those are later combined into a multi-objective approach that predicts a Pareto-set of frequency configurations. Results show that our approach is very accurate at predicting extema and the Pareto set, and finds frequency configurations that dominate the default configuration in either energy or performance.
3
Sun, Jiang, Ju Long Lan, and Yu Feng Li. "Reseach and Implementation of Packet Capture Based on Multi-Core Binding Technology in Linux Environment." Applied Mechanics and Materials 48-49 (February 2011): 902–5. http://dx.doi.org/10.4028/www.scientific.net/amm.48-49.902.
Full textAbstract:
According to zero-copy idea and the application of multi-core binding to realize a high-performance packet capture platform based on multi-core binding(MCPCP).By modifying the memory management mode about sk_buff in kernel,realize the user space program to directly access the data packet, which is a kind of universal significance of the zero-copy scheme. And then through the multi-core binding technique, for each CPU core scheduling and control, with multi-threaded user programs can minimize the cache jitter to improve the efficiency of packet capture. Experiments show that in the case of low-end configuration, the throughputs of MCPCP for 64Byte and 1500Byte messages are 620 ,000pps (about 320Mbps) and 78,000pps (about 941Mbps) respectively. In the high-end configuration, can reach 1.46 million pps (748Mbps) and 81,000 pps (979Mbps).MCPCP surpasses the traditional ones' in performance.
4
Wang, Dong. "The Study of Multi-Tenant's Configurability." Modern Electronic Technology 1, no. 1 (October 16, 2017): 24. http://dx.doi.org/10.26549/met.v1i1.326.
Full textAbstract:
SaaS (Software as a Service)the application mode occurs exactly along with the broadening and convenience of network platform, its core is the application of Multi-Tenant. The Multi-Tenant under SaaS not only makes Application Software more efficient and convenient, but also reduce the cost of software development, hardware purchase, training and upgrade maintenance, which can relieve the financial pressure of enterprises invisibly, so that enterprises can focus on the business development. Aiming at the personalized demand of Multi-Tenant's tenement, this thesis studies about personalized configuration of data, function, and operation interface, moreover, it shows the method of personalized configuration. It also indicates how to make the Multi-Tenant come true through personalized configuration, and realizes unified management of these applications.
5
Coutinho Demetrios, A. M., Daniele De Sensi, Arthur Francisco Lorenzon, Kyriakos Georgiou, Jose Nunez-Yanez, Kerstin Eder, and Samuel Xavier-de-Souza. "Performance and Energy Trade-Offs for Parallel Applications on Heterogeneous Multi-Processing Systems." Energies 13, no. 9 (May 11, 2020): 2409. http://dx.doi.org/10.3390/en13092409.
Full textAbstract:
This work proposes a methodology to find performance and energy trade-offs for parallel applications running on Heterogeneous Multi-Processing systems with a single instruction-set architecture. These offer flexibility in the form of different core types and voltage and frequency pairings, defining a vast design space to explore. Therefore, for a given application, choosing a configuration that optimizes the performance and energy consumption is not straightforward. Our method proposes novel analytical models for performance and power consumption whose parameters can be fitted using only a few strategically sampled offline measurements. These models are then used to estimate an application’s performance and energy consumption for the whole configuration space. In turn, these offline predictions define the choice of estimated Pareto-optimal configurations of the model, which are used to inform the selection of the configuration that the application should be executed on. The methodology was validated on an ODROID-XU3 board for eight programs from the PARSEC Benchmark, Phoronix Test Suite and Rodinia applications. The generated Pareto-optimal configuration space represented a 99% reduction of the universe of all available configurations. Energy savings of up to 59.77%, 61.38% and 17.7% were observed when compared to the performance, ondemand and powersave Linux governors, respectively, with higher or similar performance.
6
Scharf, Oliver, and Gediminas Gaigalas. "Large scale multi-configuration Hartree-Fock calculation of the hyperfine structure of the ground state of vanadium." Open Physics 4, no. 1 (March 1, 2006): 42–57. http://dx.doi.org/10.1007/s11534-005-0005-7.
Full textAbstract:
AbstractThe hyperfine structure of the ground state of vanadium, 51VI, is calculated in the nonrelativistic framework of the multi-configuration Hartree-Fock approximation. A configuration state function limiting algorithm is used to make the calculations feasible and to study the influence of core, valence and core-valence correlations in detail. The obtained configuration state function space captures the most important orbital correlations within 2%. Further correlations are included through configuration interaction calculation. The atomic state functions are used to evaluate the magnetic dipole hyperfine factor A and the electric quadrupole factor B. It turns out that the ab initio calculation can not capture the core polarization of the 2s shell. It introduces an error that is higher than the Hartree-Fock approximation. However, the detailed correlations being observed suggest the introduction of a wrong correlation orbital due to the algorithm being used. Neglecting this orbital leads to good agreement with 2% deviation from the experimental values for the A factors.
7
Maity, Arka, Anuj Pathania, and Tulika Mitra. "PkMin: Peak Power Minimization for Multi-Threaded Many-Core Applications." Journal of Low Power Electronics and Applications 10, no. 4 (September 30, 2020): 31. http://dx.doi.org/10.3390/jlpea10040031.
Full textAbstract:
Multiple multi-threaded tasks constitute a modern many-core application. An accompanying generic Directed Acyclic Graph (DAG) represents the execution precedence relationship between the tasks. The application comes with a hard deadline and high peak power consumption. Parallel execution of multiple tasks on multiple cores results in a quicker execution, but higher peak power. Peak power single-handedly determines the involved cooling costs in many-cores, while its violations could induce performance-crippling execution uncertainties. Less task parallelization, on the other hand, results in lower peak power, but a more prolonged deadline violating execution. The problem of peak power minimization in many-cores is to determine task-to-core mapping configuration in the spatio-temporal domain that minimizes the peak power consumption of an application, but ensures application still meets the deadline. All previous works on peak power minimization for many-core applications (with or without DAG) assume only single-threaded tasks. We are the first to propose a framework, called PkMin, which minimizes the peak power of many-core applications with DAG that have multi-threaded tasks. PkMin leverages the inherent convexity in the execution characteristics of multi-threaded tasks to find a configuration that satisfies the deadline, as well as minimizes peak power. Evaluation on hundreds of applications shows PkMin on average results in 49.2% lower peak power than a similar state-of-the-art framework.
8
Hernandez-Solis, Augusto, Yohannes Molla, Edoaurd Malambu, Alexey Stankovskiy, and Gert Van den Eynde. "VERIFICATION OF THE OpenMC HOMOGENIZED MYRRHA-1.6 CORE MODEL." EPJ Web of Conferences 247 (2021): 04002. http://dx.doi.org/10.1051/epjconf/202124704002.
Full textAbstract:
The OpenMC code is being employed both as a multi-group nodal macroscopic cross-section generator and a reference multi-group Monte Carlo (MGMC) solution. The aim is to do a neutronic benchmark verification study versus a deterministic model (based on the MYRRHA-1.6 core) performed by the PHISICS simulator. MYRRHA, a novel research accelerator driven system concept that is also foreseen to work as a critical configuration, offers a rich opportunity of testing state-of-the art methods for reactor physics analysis due to its strong heterogeneous configuration utilized for both thermal and fast spectra irradiation purposes. The original core configuration representing MYRRHA-1.6 and formed by 169 assemblies, was launched in OpenMC for producing a homogenous nodal model that, when executed in its multi-group Monte Carlo mode, it produced a keff that differs in almost 500 pcm from the original case. This means that in the future, such approximation should correct the nodal cross-sections to preserve the reaction rates in order to match those ones from the heterogeneous model. Nevertheless, such MGMC mode of operation offered by OpenMC could be exploited in order to verify deterministic core simulators. By inputting the same nodal multi-group cross-section model into the transport solver of the PHISICS toolkit, the neutronic benchmark showed a difference of 171 pcm in eigenvalue while comparing it to its OpenMC MGMC counterpart. Also, local multi-group and energy-integrated nodal profiles of the neutron flux showed a maximum relative difference between methodologies of 15% and 1%, respectively. This means that the MGMC capabilities offered by OpenMC can be employed to verify other deterministic methodologies.
9
Hao, Qing Bin, Cheng Shan Li, Sheng Nan Zhang, Gao Shan Li, Li Feng Bai, Guo Qing Liu, and Ping Xiang Zhang. "Preparation of Multi-Core Bi-2212/Ag Wires." Materials Science Forum 745-746 (February 2013): 168–72. http://dx.doi.org/10.4028/www.scientific.net/msf.745-746.168.
Full textAbstract:
The core breaking mechanism of the traditional Bi-2212 wires with filament configuration of 85×7 during the drawing process was analyzed, and the solution of these problems was given. The results showed that the major reason of core breaking occurs was that the tensile stress was bigger on the center than the edge of Bi-2212 wires during the drawing, and the silver-superconductor ratio was smaller of the center than the edge of the traditional Bi-2212 wires. It was effective to avoid the core breaking of Bi-2212 wires using the Ag core strengthener, and the uniformity of distortion of Bi-2212 wires during the drawing was improved, and the critical current of Bi-2212 wires increased 40% than that of traditional wires. If the diameter of the filament of Bi-2212 wires decreased further, there would be lots of bridging between core and core, which provided routeway for current. So the critical current of Bi-2212 wires was improved further.
10
Farahani, Elham Darmanaki, and Jafar Habibi. "Configuration Management Model in Evolutionary Software Product Line." International Journal of Software Engineering and Knowledge Engineering 26, no. 03 (April 2016): 433–55. http://dx.doi.org/10.1142/s0218194016500182.
Full textAbstract:
In Software Product Line (SPL), Configuration Management (CM) is a multi-dimensional problem. On the one hand, the Core Assets that constitute a configuration need to be managed, and on the other hand, each product in the product line that is built using a configuration must be managed, and furthermore, the management of all these configurations must be coordinated under a single process. Therefore, CM for product lines is more complex than for single systems. The CM of any software system involves four closely related activities: Change Management (ChM), Version Management (VM), System Building (SB) and Release Management (RM) [I. Sommerville, Software Engineering, 9th edn. (Addison-Wesley, 2010)]. The aim of this paper is to provide ChM and VM models for evolutionary-based SPL system development and maintenance. The proposed models support any level of aggregation in SPLs and have been applied to Mobile SPL as a case study.
11
Wahid, Achraf, Nadia Mouhib, Fatima Sabah, Hamid Chakir, and M. EL Ghorba. "Analytical estimation of the reliability of wire rope based on cumulative damage." MATEC Web of Conferences 286 (2019): 05001. http://dx.doi.org/10.1051/matecconf/201928605001.
Full textAbstract:
The main objective of this manuscript is the elaboration of a behavior model of the cable system, designed to the prediction of its damage from the behavior of its components (wires, strands). This multi-faceted scale is based primarily on the results experiments of the central core and helical strands components. At first, a resolution numerical probabilistic equation for the different configurations was established by the programming the system resolution scheme obtained, Subsequently, each damage curves obtained, corresponding to a particular configuration has been interpreted independently.
12
Li, Weiqiang, Xiao Ge, Hao Zhang, Qianqian Ding, Hualin Ding, Yunxia Zhang, Guozhong Wang, Haimin Zhang, and Huijun Zhao. "Hollow mesoporous SiO2 sphere nanoarchitectures with encapsulated silver nanoparticles for catalytic reduction of 4-nitrophenol." Inorganic Chemistry Frontiers 3, no. 5 (2016): 663–70. http://dx.doi.org/10.1039/c6qi00002a.
Full textAbstract:
Ag@hm-SiO2 nanoreactors with the multi-cores/shell configuration have been successfully synthesized via an effective pre-shell/post-core strategy combined with the laser ablation treatment.
13
Aalsaud, Ali, Fei Xia, Ashur Rafiev, Rishad Shafik, Alexander Romanovsky, and Alex Yakovlev. "Low-Complexity Run-time Management of Concurrent Workloads for Energy-Efficient Multi-Core Systems." Journal of Low Power Electronics and Applications 10, no. 3 (August 25, 2020): 25. http://dx.doi.org/10.3390/jlpea10030025.
Full textAbstract:
Contemporary embedded systems may execute multiple applications, potentially concurrently on heterogeneous platforms, with different system workloads (CPU- or memory-intensive or both) leading to different power signatures. This makes finding the most energy-efficient system configuration for each type of workload scenario extremely challenging. This paper proposes a novel run-time optimization approach aiming for maximum power normalized performance under such circumstances. Based on experimenting with PARSEC applications on an Odroid XU-3 and Intel Core i7 platforms, we model power normalized performance (in terms of instruction per second (IPS)/Watt) through multivariate linear regression (MLR). We derive run-time control methods to exploit the models in different ways, trading off optimization results with control overheads. We demonstrate low-cost and low-complexity run-time algorithms that continuously adapt system configuration to improve the IPS/Watt by up to 139% compared to existing approaches.
14
Courtney, Amy, Luke M. Alvey, George O. T. Merces, Niamh Burke, and Mark Pickering. "The Flexiscope: a low cost, flexible, convertible and modular microscope with automated scanning and micromanipulation." Royal Society Open Science 7, no. 3 (March 2020): 191949. http://dx.doi.org/10.1098/rsos.191949.
Full textAbstract:
With technologies rapidly evolving, many research institutions are now opting to invest in costly, high-quality, specialized microscopes which are shared by many researchers. As a consequence, the user may not have the ability to adapt a microscope to their specific needs and limitations in experimental design are introduced. A flexible work-horse microscopy system is a valuable tool in any laboratory to meet the diverse needs of a research team and promote innovation in experimental design. We have developed the Flexiscope; a multi-functional, adaptable, efficient and high-performance microscopy/electrophysiology system for everyday applications in a neurobiology laboratory. The core optical components are relatively constant in the three configurations described here: an upright configuration, an inverted configuration and an upright/electrophysiology configuration. We have provided a comprehensive description of the Flexiscope. We show that this method is capable of oblique infrared illumination imaging, multi-channel fluorescent imaging and automated three-dimensional scanning of larger specimens. Image quality is conserved across the three configurations of the microscope, and conversion between configurations is possible quickly and easily, while the motion control system can be repurposed to allow sub-micrometre computer-controlled micromanipulation. The Flexiscope provides similar performance and usability to commercially available systems. However, as it can be easily reconfigured for multiple roles, it can remove the need to purchase multiple microscopes, giving significant cost savings. The modular reconfigurable nature allows the user to customize the system to their specific needs and adapt/upgrade the system as challenges arise, without requiring specialized technical skills.
15
Qiu, Weiming, Yonghao Chen, Dihu Chen, Tao Su, and Simei Yang. "Run-Time Hierarchical Management of Mapping, Per-Cluster DVFS and Per-Core DPM for Energy Optimization." Electronics 11, no. 7 (March 30, 2022): 1094. http://dx.doi.org/10.3390/electronics11071094.
Full textAbstract:
Heterogeneous cluster-based multi/many-core systems (e.g., ARM big.LITTLE, supporting dynamic voltage and frequency scaling (DVFS) at cluster level and dynamic power management (DPM) at core level) have attracted much attention to optimize energy on modern embedded systems. For concurrently executing applications on such a platform, this paper aims to study how to appropriately apply the three system configurations (mapping, DVFS, and DPM) to reduce both dynamic and static energy. To this end, this paper first formulates the dependence of the three system configurations on heterogeneous cluster-based systems as a 0–1 integrated linear programming (ILP) model, taking into account run-time configuration overheads (e.g., costs of DPM mode switching and task migration). Then, with the 0–1 ILP model, different run-time strategies (e.g., considering the three configurations in fully separate, partially separate, and holistic manners) are compared based on a hierarchical management structure and design-time prepared data. Experimental case studies offer insights into the effectiveness of different management strategies on different platform sizes (e.g., #cluster × #core, 2 × 4, 2 × 8, 4 × 4, 4 × 8), in terms of application migration, energy efficiency, resource efficiency, and complexity.
16
Arbaoui, Jamal, Hassane Moustabchir, Catalin I. Pruncu, and Yves Schmitt. "Modeling and experimental analysis of polypropylene honeycomb multi-layer sandwich composites under four-point bending." Journal of Sandwich Structures & Materials 20, no. 4 (July 22, 2016): 493–511. http://dx.doi.org/10.1177/1099636216659779.
Full textAbstract:
The behavior of a simple and innovative multi-layer sandwich panels having a polypropylene honeycomb core has been investigated carefully, theoretically and experimentally. A four-point bending test was performed to detect the mechanical characteristics of the multi-layer core. The experimental results emphasize a better rigidity of the multi-layer structure compared to the weakness displayed by the single-layer configuration. In fact, a small increase in the final weight of the component leads to a significant increase of the mechanical properties. In the second part of this study, analytical and numerical homogenization approaches were developed to compute the effective properties of the single polypropylene honeycomb core. The numerical model complies with the experimental protocol, and the simulation conducted is aiming to reproduce a typical four-point bending test on a polypropylene honeycomb multi-layer sandwich panel. Both numerical and experimental results are presented in details and a good correlation between them is highlighted.
17
Hochendoner, Philip, Curtis Ogle, and William H. Mather. "A queueing approach to multi-site enzyme kinetics." Interface Focus 4, no. 3 (June 6, 2014): 20130077. http://dx.doi.org/10.1098/rsfs.2013.0077.
Full textAbstract:
Multi-site enzymes, defined as where multiple substrate molecules can bind simultaneously to the same enzyme molecule, play a key role in a number of biological networks, with the Escherichia coli protease ClpXP a well-studied example. These enzymes can form a low latency ‘waiting line’ of substrate to the enzyme's catalytic core, such that the enzyme molecule can continue to collect substrate even when the catalytic core is occupied. To understand multi-site enzyme kinetics, we study a discrete stochastic model that includes a single catalytic core fed by a fixed number of substrate binding sites. A natural queueing systems analogy is found to provide substantial insight into the dynamics of the model. From this, we derive exact results for the probability distribution of the enzyme configuration and for the distribution of substrate departure times in the case of identical but distinguishable classes of substrate molecules. Comments are also provided for the case when different classes of substrate molecules are not processed identically.
18
Scrugli, Matteo Antonio, Paolo Meloni, Carlo Sau, and Luigi Raffo. "Runtime Adaptive IoMT Node on Multi-Core Processor Platform." Electronics 10, no. 21 (October 21, 2021): 2572. http://dx.doi.org/10.3390/electronics10212572.
Full textAbstract:
The Internet of Medical Things (IoMT) paradigm is becoming mainstream in multiple clinical trials and healthcare procedures. Thanks to innovative technologies, latest-generation communication networks, and state-of-the-art portable devices, IoTM opens up new scenarios for data collection and continuous patient monitoring. Two very important aspects should be considered to make the most of this paradigm. For the first aspect, moving the processing task from the cloud to the edge leads to several advantages, such as responsiveness, portability, scalability, and reliability of the sensor node. For the second aspect, in order to increase the accuracy of the system, state-of-the-art cognitive algorithms based on artificial intelligence and deep learning must be integrated. Sensory nodes often need to be battery powered and need to remain active for a long time without a different power source. Therefore, one of the challenges to be addressed during the design and development of IoMT devices concerns energy optimization. Our work proposes an implementation of cognitive data analysis based on deep learning techniques on resource-constrained computing platform. To handle power efficiency, we introduced a component called Adaptive runtime Manager (ADAM). This component takes care of reconfiguring the hardware and software of the device dynamically during the execution, in order to better adapt it to the workload and the required operating mode. To test the high computational load on a multi-core system, the Orlando prototype board by STMicroelectronics, cognitive analysis of Electrocardiogram (ECG) traces have been adopted, considering single-channel and six-channel simultaneous cases. Experimental results show that by managing the sensory node configuration at runtime, energy savings of at least 15% can be achieved.
19
Jiang, Xi, Xue Sheng Ji, and Jun Liu. "Multi-Resolution Modeling of High Speed Railway Infrastructure for Train Operation Simulation." Applied Mechanics and Materials 97-98 (September 2011): 560–65. http://dx.doi.org/10.4028/www.scientific.net/amm.97-98.560.
Full textAbstract:
This paper analyzes the railway infrastructure simulation demands in train operation and organization at different levels. It takes the rail road network topology model and the railway signal system model as the core to build a multi-resolution-based simulation model architecture of the railway infrastructure. According to different information needs of railway infrastructure simulation model, it proposes a Hierarchical model achieving logic function of signaling system, and studies the signal system’s multi-resolution simulation methods through multi-level logic block configuration. According to the space information requirement of different simulation levels, the paper builds a multi-resolution rail road network mode.
20
NEST, M. "DETERMINATION OF THE ELECTRONIC GROUND STATE OF MOLECULAR SYSTEMS WITH THE MULTI-CONFIGURATION TIME-DEPENDENT HARTREE–FOCK METHOD." Journal of Theoretical and Computational Chemistry 06, no. 03 (September 2007): 563–74. http://dx.doi.org/10.1142/s0219633607003180.
Full textAbstract:
In this paper, we present progress in the application of the explicitly time-dependent multi-configuration time-dependent Hartree–Fock (MCTDHF) method. The spin–orbitals and equations of motion are expressed in the basis of Gaussian Type Orbitals. MCTDHF is then applied to the calculation of the electronic ground state of various small molecules by imaginary time propagation. We were able to take between four and 12 active electrons into account. We discuss the suitability of a core guess as initial wave function, the possibility to obtain excited states, as well as the consequences of a neglect of core excitations.
21
GOU, BINGCONG, YIDONG LIU, and FENG WANG. "ELECTRON CORRELATION EFFECTS FOR DOUBLY-EXCITED STATES OF Be-LIKE Ar14+ ION." International Journal of Modern Physics B 18, no. 17n19 (July 30, 2004): 2590–94. http://dx.doi.org/10.1142/s0217979204025725.
Full textAbstract:
The energies, radiative and Auger rates of the doubly excited states of Be-like Ar 14+ ion are studied by using the multi-configuration-interaction method and model potential method. The doubly excited states of Be-like Ar 14+ are labeled by the quantum numbers K, T and A to show the systematic regularity. The results show that the spectroscopy of Be-like ions is different from that of He-like ions because of the polarization and core penetration effects from the 1s2 core electrons.
22
Suo, Lina, Ya-Pei Peng, Cheng-Kai Yao, Shijie Ren, Xinhe Lu, and Nan-Kuang Chen. "High Sensitivity Strain Sensors Using Four-Core Fibers through a Corner-Core Excitation." Micromachines 13, no. 3 (March 11, 2022): 431. http://dx.doi.org/10.3390/mi13030431.
Full textAbstract:
A weakly-coupled multicore fiber can generate supermodes when the multi-cores are closer to enter the evanescent power coupling region. The high sensitivity strain sensors using tapered four-core fibers (FCFs) were demonstrated. The fan-in and fan-out couplers were used to carry out light coupling between singlemode fibers and the individual core of the FCFs. A broadband lightsource from superlumminescent diodes (SLDs) was launched into one of the four cores arranged in a rectangular configuration. When the FCF was substantially tapered, the asymmetric supermodes were produced to generate interferences through this corner-core excitation scheme. During tapering, the supermodes were excited based on a tri-core structure initially and then transited to a rectangular quadruple-core structure gradually to reach the sensitivity of 185.18 pm/μԑ under a tapered diameter of 3 μm. The asymmetric evanescent wave distribution due to the corner-core excitation scheme is helpful to increase the optical path difference (OPD) between supermodes for improving the strain sensitivity.
23
Barg, Sobhi, and Kent Bertilsson. "Multi-objective Pareto and GAs nonlinear optimization approach for flyback transformer." Electrical Engineering 101, no. 3 (September 2019): 995–1006. http://dx.doi.org/10.1007/s00202-019-00836-3.
Full textAbstract:
Abstract Design and optimization of high-frequency inductive components is a complex task because of the huge number of variables to manipulate, the strong interdependence and the interaction between variables, the nonlinear variation of some design variables as well as the problem nonlinearity. This paper proposes a multi-objective design methodology of a 200-W flyback transformer in continuous conduction mode using genetic algorithms and Pareto optimality concept. The objective is to minimize loss, volume and cost of the transformer. Design variables such as the duty cycle, the winding configuration and the core shape, which have great effects on the former objectives but were neglected in previous works, are considered in this paper. The optimization is performed in discrete research space at different switching frequencies. In total, 24 magnetic materials, 6 core shapes and 2 winding configurations are considered in the database. Accurate volume and cost models are also developed to deal with the optimization in the discrete research space. The bi-objective (loss–volume) and tri-objective (loss–volume–cost) optimization results are presented, and the variations of the design variables are analyzed for the case of 60 kHz. An example of a design (30 kHz) is experimentally verified. The registered efficiency is 88% at full load.
24
Xu, Min, Gang Jiang, Miao Wu, Xiangfu Li, Guojie Bian, and Feng Hu. "Multiconfiguration Dirac–Fock calculations of excitation energies and wavelengths in highly charged tungsten ions." Canadian Journal of Physics 94, no. 6 (June 2016): 563–68. http://dx.doi.org/10.1139/cjp-2015-0772.
Full textAbstract:
The fully relativistic multiconfiguration Dirac–Fock (MCDF) method is employed to calculate the excitation energies and wavelengths for nine isoelectronic sequences of tungsten ions. In calculations, electron correlations, quantum electrodynamical (QED) effect, and Breit correction are taken into account. The core–valence and valence–valence corrections are analyzed in a systematic way. The core setting was systematically studied for four cases of one electron occupying the outermost s orbital, one electron occupying the outermost p orbital, three electrons occupying the outermost p orbital, and one electron occupying the outermost d orbital. In our research, at least two calculation models are adopted for every tungsten ion. Through analyzing our results, it is found that the following three calculation models can help to get results closer to measured values: (i) setting the closed shells as core; (ii) taking core–valence corrections into account when there is only one valence electron; (iii) taking valence–valence corrections into account when the number of valence electrons is not less than three. The purpose of this paper is to provide some references on configuration selection and configuration interaction in calculations for a multi-electron system of highly charged tungsten ions.
25
Qiao, Zhitong, Yan Han, Xiaoxia Han, Han Xu, Will X. Y. Li, Dong Song, Theodore W. Berger, and Ray C. C. Cheung. "ASIC Implementation of a Nonlinear Dynamical Model for Hippocampal Prosthesis." Neural Computation 30, no. 9 (September 2018): 2472–99. http://dx.doi.org/10.1162/neco_a_01107.
Full textAbstract:
A hippocampal prosthesis is a very large scale integration (VLSI) biochip that needs to be implanted in the biological brain to solve a cognitive dysfunction. In this letter, we propose a novel low-complexity, small-area, and low-power programmable hippocampal neural network application-specific integrated circuit (ASIC) for a hippocampal prosthesis. It is based on the nonlinear dynamical model of the hippocampus: namely multi-input, multi-output (MIMO)–generalized Laguerre-Volterra model (GLVM). It can realize the real-time prediction of hippocampal neural activity. New hardware architecture, a storage space configuration scheme, low-power convolution, and gaussian random number generator modules are proposed. The ASIC is fabricated in 40 nm technology with a core area of 0.122 mm[Formula: see text] and test power of 84.4 [Formula: see text]W. Compared with the design based on the traditional architecture, experimental results show that the core area of the chip is reduced by 84.94% and the core power is reduced by 24.30%.
26
Hua, Weijie, Kochise Bennett, Yu Zhang, Yi Luo, and Shaul Mukamel. "Study of double core hole excitations in molecules by X-ray double-quantum-coherence signals: a multi-configuration simulation." Chemical Science 7, no. 9 (2016): 5922–33. http://dx.doi.org/10.1039/c6sc01571a.
Full text
27
Carniato, Stéphane, Jean-Marc Bizau, Denis Cubaynes, Eugene T. Kennedy, Ségolène Guilbaud, Emma Sokell, Brendan McLaughlin, and Jean-Paul Mosnier. "Vibrationally and Spin-Orbit-Resolved Inner-Shell X-ray Absorption Spectroscopy of the NH+ Molecular Ion: Measurements and ab Initio Calculations." Atoms 8, no. 4 (October 4, 2020): 67. http://dx.doi.org/10.3390/atoms8040067.
Full textAbstract:
This article presents N2+ fragment yields following nitrogen K-shell photo-absorption in the NH+ molecular ion measured at the SOLEIL synchrotron radiation facility in the photon energy region 390–450 eV. The combination of the high sensitivity of the merged-beam, multi-analysis ion apparatus (MAIA) with the high spectral resolution of the PLEIADES beamline helped to resolve experimentally vibrational structures of highly excited [N1s−1H]*+ electronic states with closed or open-shell configurations. The assignment of the observed spectral features was achieved with the help of density functional theory (DFT) and post-Hartree Fock Multiconfiguration Self-Consistent-Field/Configuration Interaction (MCSCF/CI) ab-initio theoretical calculations of the N1s core-to-valence and core-to-Rydberg excitations, including vibrational dynamics. New resonances were identified compared to previous work, owing to detailed molecular modeling of the vibrational, spin-orbit coupling and metastable state effects on the spectra. The latter are evidenced by spectral contributions from the 4Σ− electronic state which lies 0.07 eV above the NH+2Π ground state.
28
Zhang, Jingxing, Zhongzheng Lin, Jie Liu, Junyi Liu, Zhenrui Lin, Shuqi Mo, Shuqing Lin, et al. "SDM transmission of orbital angular momentum mode channels over a multi-ring-core fibre." Nanophotonics 11, no. 4 (November 19, 2021): 873–84. http://dx.doi.org/10.1515/nanoph-2021-0471.
Full textAbstract:
Abstract Spatial division multiplexed optical transmission over a multi-ring-core orbital angular momentum (OAM) fibre is reported for the first time. The seven cores in the fibre each supports OAM modes belonging to mode groups (MGs) of topological charge |l| = 0–4. The MGs of |l| = 1–4 each contains four near-degenerate OAM modes that carry the combinations of opposite orbital and spin angular momenta. The weak coupling between these higher-order MGs as well as between the cores enables the simultaneous transmission of 56 OAM mode channels (two MGs per core of the topological charges |l| = 2 and 3) over the 60-km span, while only requiring modular 4 × 4 multi-input multi-output (MIMO) signal processing to equalize the mixing among the four mode channels in each MG that are strongly coupled – a feature that also minimizes the number of filter taps. The mode channels are launched using seven-core single-mode fibre fan-in devices, with the light in all seven cores converted into OAM modes via specially designed plates that carry seven off-axis-compensated phase masks matching the hexagonal configuration of the multi-core fibres. Each mode channel carries 10 WDM wavelengths, equivalently aggregating to a capacity of 31.4 Tbit/s (net 25.1 Tb/s) and a spectral efficiency (SE) of 62.7 bit/s/Hz (net 50.2 bit/s/Hz) with 28-GBaud QPSK modulation per data channel.
29
Guo, Yongxing, Min Chen, Li Xiong, Xinglin Zhou, and Cong Li. "Fiber Bragg grating based acceleration sensors: a review." Sensor Review 41, no. 1 (February 11, 2021): 101–22. http://dx.doi.org/10.1108/sr-10-2020-0243.
Full textAbstract:
Purpose The purpose of this study is to present the state of the art for fiber Bragg grating (FBG) acceleration sensing technologies from two aspects: the principle of the measurement dimension and the principle of the sensing configuration. Some commercial sensors have also been introduced and future work in this field has also been discussed. This paper could provide an important reference for the research community. Design/methodology/approach This review is to present the state of the art for FBG acceleration sensing technologies from two aspects: the principle of the measurement dimension (one-dimension and multi-dimension) and the principle of the sensing configuration (beam type, radial vibration type, axial vibration type and other composite structures). Findings The current research on developing FBG acceleration sensors is mainly focused on the sensing method, the construction and design of the elastic structure and the design of a new information detection method. This paper hypothesizes that in the future, the following research trends will be strengthened: common single-mode fiber grating of the low cost and high utilization rate; high sensitivity and strength special fiber grating; multi-core fiber grating for measuring single-parameter multi-dimensional information or multi-parameter information; demodulating equipment of low cost, small volume and high sampling frequency. Originality/value The principle of the measurement dimension and principle of the sensing configuration for FBG acceleration sensors have been introduced, which could provide an important reference for the research community.
30
Ahadi, Amir Mohammad, Hana Libenská, Tereza Košutová, Miroslav Cieslar, Veronika Červenková, Dejan Prokop, Milan Dopita, Hynek Biederman, and Jan Hanuš. "Core@shell nanoparticles by inflight controlled coating." Journal of Physics D: Applied Physics 55, no. 21 (February 25, 2022): 215201. http://dx.doi.org/10.1088/1361-6463/ac5559.
Full textAbstract:
Abstract Controlled synthesis of core@shell nanoparticles (NPs) for certain applications is a difficult challenge in many nanotechnology projects. In this report, a conventional arrangement composed of a gas aggregation source (GAS) is employed to generate the core NPs, which are subsequently coated by the shell materials in a secondary planar magnetron sputtering. The important difference to the usual system is the application of the two opposing planar magnetrons in a closed field configuration. The prepared core Ag NPs by a GAS are coated/treated by the two magnetrons with Ti targets. Our findings clearly show that the shell thickness can be controlled by tuning the power delivered to the secondary magnetron plasma. Characterizations of the prepared films, by x-ray diffraction technique, disclose multi-crystalline cores covered by amorphous shells. Based on x-ray photoelectron spectroscopy and energy dispersive x-ray spectroscopy measurements, different chemistry on the NPs surfaces and volume of the NPs can be achieved by tuning the operation conditions. Furthermore, the thermal annealing process leads to the growth of the crystallite size which results in emerging some microparticles caused by accelerating Ag surface mobility. The employed technique promises a reliable route to synthesize different heterogeneous NPs with stoichiometry tunable in a wide range for multi-functional devices.
31
Tian, Hong Wei, Hai Feng Chang, and Hong Jun Ye. "Progress in Foldcore Sandwich Manufacturing and Application." Key Engineering Materials 905 (January 4, 2022): 246–53. http://dx.doi.org/10.4028/www.scientific.net/kem.905.246.
Full textAbstract:
The sandwich structure with foldcore is a new type of structural material with light weight, high specific strength, high specific rigidity and multi-functional potential, which is connected with each other in core space, this kind of three dimensional structures can be formed by folding based on two dimensional materials. The main research achievements and characteristics of sandwich structure with foldcore in recent years are summarized and analyzed according to the lightweight and multi-functional requirements of aircraft structure in this paper. The configuration optimization scheme and fabrication process of the sandwich structure with foldcore are described. Moreover, the research status of multi-function of the sandwich structure with foldcore are summarized, including sound insulation, thermal protection, stealth performance of the structure, etc.
32
Al-Qutt, Mirvat Mahmoud, Heba Khaled, and Rania El Gohary. "Neural Network Inversion-Based Model for Predicting an Optimal Hardware Configuration." International Journal of Grid and High Performance Computing 13, no. 2 (April 2021): 95–117. http://dx.doi.org/10.4018/ijghpc.2021040106.
Full textAbstract:
Deciding the number of processors that can efficiently speed-up solving a computationally intensive problem while perceiving efficient power consumption constitutes a major challenge to researcher in the HPC high performance computing realm. This paper exploits machine learning techniques to propose and implement a recommender system that recommends the optimal HPC architecture given the problem size. An approach for multi-objective function optimization based on neural network (neural network inversion) is employed. The neural network inversion approach is used for forward problem optimization. The objective functions in concern are maximizing the speedup and minimizing the power consumption. The recommendations of the proposed prediction systems achieved more than 89% accuracy for both validation and testing set. The experiments were conducted on 2500 CUDA core on Tesla K20 Kepler GPU Accelerator and Intel(R) Xeon(R) CPU E5-2695 v2.
33
Pinho, Ana C., and Ana P. Piedade. "Sandwich Multi-Material 3D-Printed Polymers: Influence of Aging on the Impact and Flexure Resistances." Polymers 13, no. 22 (November 21, 2021): 4030. http://dx.doi.org/10.3390/polym13224030.
Full textAbstract:
With the advances in new materials, equipment, and processes, additive manufacturing (AM) has gained increased importance for producing the final parts that are used in several industrial areas, such as automotive, aeronautics, and health. The constant development of 3D-printing equipment allows for printing multi-material systems as sandwich specimens using, for example, double-nozzle configurations. The present study aimed to compare the mechanical behavior of multi-material specimens that were produced using a double-nozzle 3D printer. The materials that were included in this study were the copolymer acrylonitrile-butadiene-styrene (ABS), high-impact polystyrene (HIPS), poly(methyl methacrylate) (PMMA), and thermoplastic polyurethane (TPU). The configuration of the sandwich structures consisted of a core of TPU and the outer skins made of one of the other three materials. The mechanical behavior was evaluated through three-point bending (3PB) and transverse impact tests and compared with mono-material printed specimens. The effect of aging in artificial saliva was evaluated for all the processed materials. The main conclusion of this study was that the aging process did not significantly alter the mechanical properties for mono-materials, except for PMMA, where the maximum flexural stress decreased. In the sandwich structures, the TPU core had a softening effect, inducing a significant increase in the resilience and resistance to transverse impact. The obtained results are quite promising for applications in biomedical devices, such as protective mouthguards or teeth aligners. In these specific applications, the changes in the mechanical properties with time and with the contact of saliva assume particular importance.
34
Jia, Hui Qin. "Design of EMC Test Software Based on Configurable File." Applied Mechanics and Materials 48-49 (February 2011): 387–90. http://dx.doi.org/10.4028/www.scientific.net/amm.48-49.387.
Full textAbstract:
According to EMC Standard,fulfilling one Test-Item generally includes below process: select and configure the parameters of instrument,form and execute the Test-Flow, therefore the main task of EMC is to configure instrument and form the Test-Item. In this paper the authors present a new method using configuration file to describe EMC Test-Item to improve the expansibility and maintainability of EMC test software. Multi-layered software architecture is designed according to EMC test operating sequence, and COM component technology is used to design the core module of each layer to guarantee plug&play for the new program-controlled instruments. Because of using the form of configuration file to describe Test-Item, the new Test-Item will be produced through Test-Engine calling Test-Item Configuration Generator. The Virtual Instrument Software Architecture is used to design and realize the frame of EMC software, and the Visual C++ software platform is used to realize the above design method. Application using configuration file make EMC software has the features of easy to use, easy update and expandability.
35
Galatus, Ramona, Nunzio Cennamo, and Emil Voiculescu. "Optimal Design of D-Type Plastic Fibers for Best Sensitivity of SPR Sensors." Advanced Engineering Forum 8-9 (June 2013): 563–73. http://dx.doi.org/10.4028/www.scientific.net/aef.8-9.563.
Full textAbstract:
A design method for a SPR (surface plasmon resonance) sensor based on a D-type plastic optical fiber (POF) geometry in a configuration of a multi-layered scheme is proposed in this paper. The numerical simulation for the optimal sensitivity with spectral interogation was performed in order to choose the practical implementation geometry of the SPR sensor. A side-polish to the half of the fiber's PMMA core, with about 10mm in length is made and a Microposit 1813 buffer and gold layer deposition is used for sample fabrication. The effect of different thickness of the layers in different multi-layered configuration has been investigated. The proposed setup for sensor test, measures the light intensity instead of phase difference. It can be used for refractive index changes (1.33-1.40) in real time detection of the substances for different biosensing applications. The proposed sensor is simple to use, has small size, it works on small analyt-sample size and it is cost effective for specific non-invasive application users.
36
Kim, Sang Woo, and Dae Yong Kim. "Analytical Investigation on Optimum Member Angle of Lattice Truss Structures." Applied Mechanics and Materials 548-549 (April 2014): 537–41. http://dx.doi.org/10.4028/www.scientific.net/amm.548-549.537.
Full textAbstract:
Metallic sandwich panels based on lattice truss structure have been developed for a wide range of potential applications with their lightweight and multi-functionality. The study focused on the analytical approach to investigate compression and shear characteristics of pyramidal and tetrahedral truss unit cells. With various unit cell models which have the same weight per unit area but different member angle, analytical solutions for effective stiffness and strength have been predicted and compared with each other. The results showed that there are the most optimal core configuration to maximize effective mechanical properties.
37
Lakhdari, Saliha, and Fateh Boutekkouk. "Optimization Trends for Wireless Network On-Chip." International Journal of Wireless Networks and Broadband Technologies 10, no. 1 (January 2021): 1–31. http://dx.doi.org/10.4018/ijwnbt.2021010101.
Full textAbstract:
Designing sustainable and high-performance wireless multi-core chips requires a matchless tradeoff between many aspects including scalable and reliable architectures implementation which in its turn implies aware-wideband energy-efficient wireless interfaces and adopting innovative straightforward optimization approaches to achieve the optimal configuration with a minimal cost. This paper focuses on investigating various existing designs and methodologies for wireless network on chip (WiNoC) architectures, as well as the different emerging technologies and optimization tools for the design of a robust and reliable WiNoC infrastructure with a special focus on combinatorial optimization meta-heuristics.
38
Papon, Nicolas, and Ann M. Stock. "What do archaeal and eukaryotic histidine kinases sense?" F1000Research 8 (December 27, 2019): 2145. http://dx.doi.org/10.12688/f1000research.20094.1.
Full textAbstract:
Signal transduction systems configured around a core phosphotransfer step between a histidine kinase and a cognate response regulator protein occur in organisms from all domains of life. These systems, termed two-component systems, constitute the majority of multi-component signaling pathways in Bacteria but are less prevalent in Archaea and Eukarya. The core signaling domains are modular, allowing versatility in configuration of components into single-step phosphotransfer and multi-step phosphorelay pathways, the former being predominant in bacteria and the latter in eukaryotes. Two-component systems regulate key cellular regulatory processes that provide adaptive responses to environmental stimuli and are of interest for the development of antimicrobial therapeutics, biotechnology applications, and biosensor engineering. In bacteria, two-component systems have been found to mediate responses to an extremely broad array of extracellular and intracellular chemical and physical stimuli, whereas in archaea and eukaryotes, the use of two-component systems is more limited. This review summarizes recent advances in exploring the repertoire of sensor histidine kinases in the Archaea and Eukarya domains of life.
39
Liu, Ying, and Peng Zhou. "Plastic Performance and Coordinated Design of Surface-Reinforced Sandwich Beams." International Journal of Applied Mechanics 12, no. 01 (January 2020): 2050006. http://dx.doi.org/10.1142/s1758825120500064.
Full textAbstract:
In this work, a surface-reinforced sandwich configuration with variable material layer is proposed to improve the plastic performance of sandwich structures in limited-space with the least cost, which is promoted by the hierarchy of human bone with multi-stiff layers outside the cellular core. First, a generalized yielding criterion and an analytical model for the large deflection of the fully clamped surface-reinforced sandwich beams under transverse loading are developed. Then, the comparison between finite element (FE) simulations and experimental results for surface-reinforced sandwich beams with varied geometric and physical properties of each material layers is presented, which verifies the accuracy of the theoretical solutions. Finally, the coordinated design of the surface-reinforced sandwich beam in limited-space is investigated and the synergistic effects of each material layer on the load carrying and energy absorption ability of the structure are discussed in detail. The results given in this paper provide theoretical guidance in plastic design of sandwich structures with multi-cover sheets as well as the selection of the face-sheet, the core and the reinforced skin.
40
Kubiński, Wojciech, Piotr Darnowski, and Kamil Chęć. "Optimization of the loading pattern of the PWR core using genetic algorithms and multi-purpose fitness function." Nukleonika 66, no. 4 (November 25, 2021): 147–51. http://dx.doi.org/10.2478/nuka-2021-0022.
Full textAbstract:
Abstract The study demonstrates an application of genetic algorithms (GAs) in the optimization of the first core loading pattern. The Massachusetts Institute of Technology (MIT) BEAVRS pressurized water reactor (PWR) model was applied with PARCS nodal-diffusion core simulator coupled with GA numerical tool to perform pattern selection. In principle, GAs have been successfully used in many nuclear engineering problems such as core geometry optimization and fuel configuration. In many cases, however, these analyses focused on optimizing only a single parameter, such as the effective neutron multiplication factor (k eff), and often limited to the simplified core model. On the contrary, the GAs developed in this work are equipped with multiple-purpose fitness function (FF) and allow the optimization of more than one parameter at the same time, and these were applied to a realistic full-core problem. The main parameters of interest in this study were the total power peaking factor (PPF) and the length of the fuel cycle. The basic purpose of this study was to improve the economics by finding longer fuel cycle with more uniform power/flux distribution. Proper FFs were developed, tested, and implemented and their results were compared with the reference BEAVRS first fuel cycle. In the two analysed test scenarios, it was possible to extend the first fuel cycle while maintaining lower or similar PPF, in comparison with the BEAVRS core, but for the price of increased initial reactivity.
41
Riccio, Giuseppe, Massimo Brescia, Stefano Cavuoti, Amata Mercurio, Anna Maria Di Giorgio, and Sergio Molinari. "C3: A Command-line Catalogue Cross-matching tool for modern astrophysical survey data." Proceedings of the International Astronomical Union 12, S325 (October 2016): 327–32. http://dx.doi.org/10.1017/s1743921316013120.
Full textAbstract:
AbstractIn the current data-driven science era, it is needed that data analysis techniques has to quickly evolve to face with data whose dimensions has increased up to the Petabyte scale. In particular, being modern astrophysics based on multi-wavelength data organized into large catalogues, it is crucial that the astronomical catalog cross-matching methods, strongly dependant from the catalogues size, must ensure efficiency, reliability and scalability. Furthermore, multi-band data are archived and reduced in different ways, so that the resulting catalogues may differ each other in formats, resolution, data structure, etc, thus requiring the highest generality of cross-matching features. We presentC3(Command-line Catalogue Cross-match), a multi-platform application designed to efficiently cross-match massive catalogues from modern surveys. Conceived as a stand-alone command-line process or a module within generic data reduction/analysis pipeline, it provides the maximum flexibility, in terms of portability, configuration, coordinates and cross-matching types, ensuring high performance capabilities by using a multi-core parallel processing paradigm and a sky partitioning algorithm.
42
Journal, Baghdad Science. "The Electro-Excitation Form Factors for Low-Lying States of 7Li Nucleus." Baghdad Science Journal 7, no. 1 (March 7, 2010): 105–12. http://dx.doi.org/10.21123/bsj.7.1.105-112.
Full textAbstract:
The transverse electron scattering form factors have been studied for low –lying excited states of 7Li nucleus. These states are specified by J? T= (0.478MeV), (4.63MeV) and (6.68MeV). The transitions to these states are taking place by both isoscalar and isovector components. These form factors have been analyzed in the framework of the multi-nucleon configuration mixing of harmonic oscillator shell model with size parameter brms=1.74fm. The universal two-body of Cohen-Kurath is used to generate the 1p-shell wave functions. The core polarization effects are included in the calculations through effective g-factors and resolved many discrepancies with experiments. A higher configuration effect outside the 1p-shell model space, such as the 2p-shell, enhances the form factors for q-values and reproduces the data. The present results are compared with other theoretical models. PACS: 25.30.Bf Elastic electron scattering - 25.30.Dh Inelastic electron scattering to specific states – 21.60.Cs Shell model – 27.20. +n 5? A ?19
43
Sharma, Amit R., and David E. Weeks. "Excited interatomic potential energy surfaces of Rb + He that correlate with Rb terms 52S through 72S." Physical Chemistry Chemical Physics 20, no. 46 (2018): 29274–84. http://dx.doi.org/10.1039/c8cp05550e.
Full textAbstract:
The excited state, spin-free, and spin–orbit interatomic potential energy surfaces of Rb + He which correlate with the Rb atomic terms 52S, 52P, 42D, 62S, 62P, 52D, and 72S, are calculated at multi-reference configuration interaction level of theory using all-electron basis sets of triple and quadruple-zeta quality that have been contracted for Douglas–Kroll–Hess (DKH) Hamiltonian and includes core-valence correlation. Important features of the potential energy surfaces are discussed with implications for alkali laser spectroscopy.
44
Watanabe, H., H. Ueno, D. Kameda, W. Sato, A. Yoshimi, H. Miyoshi, T. Kishida, et al. "g-Factor of the high-spin isomer in 149Dy and a multi-quasiparticle configuration caused by the N=82 core excitations." Nuclear Physics A 728, no. 3-4 (December 2003): 365–78. http://dx.doi.org/10.1016/j.nuclphysa.2003.09.007.
Full text
45
Zhang, Zi Hong, and Hong Quan Zhang. "The Design of Automatic Control System for Large-Scale Aluminum Ring Rolling Mill." Advanced Materials Research 443-444 (January 2012): 974–79. http://dx.doi.org/10.4028/www.scientific.net/amr.443-444.974.
Full textAbstract:
Large –scale aluminum ring rolling mill is the core of ring rolling ,it is required for automatic control system to realize high precision and fast response.Based on the configuration of the equipment, characteristics of ring rolling and the process flow of production, the paper not only studied the Control principle of the automatic control system but also designed the control scheme of software and hardware. The core of system is PLC. The system can effectively control hydraulic system, measurement system, feeding servo system by the cooperation of PLC and human machine interface (HMI). It realized fully automatic operation under the ring rolling mill close-loop control. The high precision control and safe operation can be realized by using multi network communication technology and advanced full AC drive system .The rolling quality of rings is high. The design accords with the control logic requirements of rolling process control. The control system is smooth and reliable.
46
Sledevič, Tomyslav, and Artūras Serackis. "mNet2FPGA: A Design Flow for Mapping a Fixed-Point CNN to Zynq SoC FPGA." Electronics 9, no. 11 (November 2, 2020): 1823. http://dx.doi.org/10.3390/electronics9111823.
Full textAbstract:
The convolutional neural networks (CNNs) are a computation and memory demanding class of deep neural networks. The field-programmable gate arrays (FPGAs) are often used to accelerate the networks deployed in embedded platforms due to the high computational complexity of CNNs. In most cases, the CNNs are trained with existing deep learning frameworks and then mapped to FPGAs with specialized toolflows. In this paper, we propose a CNN core architecture called mNet2FPGA that places a trained CNN on a SoC FPGA. The processing system (PS) is responsible for convolution and fully connected core configuration according to the list of prescheduled instructions. The programmable logic holds cores of convolution and fully connected layers. The hardware architecture is based on the advanced extensible interface (AXI) stream processing with simultaneous bidirectional transfers between RAM and the CNN core. The core was tested on a cost-optimized Z-7020 FPGA with 16-bit fixed-point VGG networks. The kernel binarization and merging with the batch normalization layer were applied to reduce the number of DSPs in the multi-channel convolutional core. The convolutional core processes eight input feature maps at once and generates eight output channels of the same size and composition at 50 MHz. The core of the fully connected (FC) layer works at 100 MHz with up to 4096 neurons per layer. In a current version of the CNN core, the size of the convolutional kernel is fixed to 3×3. The estimated average performance is 8.6 GOPS for VGG13 and near 8.4 GOPS for VGG16/19 networks.
47
Ahn Furudate, Michiko, Denis Hagebaum-Reignier, and Gwang-Hi Jeung. "Full-Dimensional Ab Initio Potential Energy Surface and Vibrational Energy Levels of Li2H." Molecules 24, no. 1 (December 21, 2018): 26. http://dx.doi.org/10.3390/molecules24010026.
Full textAbstract:
We built a full-dimensional analytical potential energy surface of the ground electronic state of Li2H from ca. 20,000 ab initio multi-reference configuration interaction calculations, including core–valence correlation effects. The surface is flexible enough to accurately describe the three dissociation channels: Li (2s 2S) + LiH (1Σ+), Li2 (1Σg+) + H (1s 2S) and 2Li (2s 2S) + H (1s 2S). Using a local fit of this surface, we calculated pure (J = 0) vibrational states of Li2H up to the barrier to linearity (ca. 3400 cm−1 above the global minimum) using a vibrational self-consistent field/virtual state configuration interaction method. We found 18 vibrational states below this barrier, with a maximum of 6 quanta in the bending mode, which indicates that Li2H could be spectroscopically observable. Moreover, we show that some of these vibrational states are highly correlated already ca. 1000 cm−1 below the height of the barrier. We hope these calculations can help the assignment of experimental spectra. In addition, the first low-lying excited states of each B1, B2 and A2 symmetry of Li2H were characterized.
48
Farhadi Beldachi, Arash, Mohammad Hosseinabady, and Jose Luis Nunez-Yanez. "Configurable Router Design for Dynamically Reconfigurable Systems based on the SoCWire NoC." International Journal of Reconfigurable and Embedded Systems (IJRES) 2, no. 1 (March 1, 2013): 27. http://dx.doi.org/10.11591/ijres.v2.i1.pp27-48.
Full textAbstract:
New Field Programmable Gate Arrays (FPGAs) are capable of implementing complete multi-core System-on-Chip (SoC) with the possibility of modifying the hardware configuration at run-time with partial dynamic reconfiguration. The usage of a soft reconfigurable Network-on-Chip (NoC) to connect these cores is investigated in this paper. We have used a standard switch developed with the objective of supporting dynamically reconfigurable FPGAs as the starting point to create a novel configurable router. The configurable router uses distributed routing suitable for regular topologies and can vary the number of local ports and communication ports to build multi dimensional networks (i.e., 2D and 3D) with different topologies. The evaluation results show that the selection of the ideal router is different depending on traffic patterns and design objectives. Overall, the mesh network with a four local ports router offers a higher level of performance with lower complexity compared to the traditional mesh with one local port router.
49
Yuqiong, Zhang, Chen Ziwei, Shao Zhifang, Zhao Qiang, and Han Chuyin. "Capacity Configuration Optimization of Micro-grid System basedon Quantum Particle Swarm Algorithm." E3S Web of Conferences 252 (2021): 01021. http://dx.doi.org/10.1051/e3sconf/202125201021.
Full textAbstract:
The optimized configuration of wind/photovoltaic/storage micro-grid system capacity can realize multi-energy complementation and improve the stability and economy of grid-connected operation of power generation units. In this paper, the capacity of each core component of the micro-grid system under different combination paths such as Wind-PV power generation, battery energy storage, hydrogen production by electrolysis, and fuel cell power generation are optimized and economically analyzed. Taking the FCFF (Free Cash Flow of Firm) net present value maximization of the system running for 20 years as the objective function, considering the impact of energy shortage rate and dynamic electricity price, an operation research optimization model is established and intelligent algorithms are used to solve the model. The model can flexibly realize capacity optimization under different micro-grid combination paths, and it can prevent the solution result from falling into the local optimum through the design of quantum particle swarm algorithm. We analyzed the optimization results in terms of economic benefits, social benefits, and environmental benefits, and further analyzed the annual power generation status of the system and the operation status of the electrolysis hydrogen production system. The calculation example shows that under the current technical conditions, the micro-grid system composed of wind and solar power generation, electrochemical energy storage, and hydrogen production by electrolysis has better economic, social and environmental benefits than other models.
50
Khan, Subayal, Jukka Saastamoinen, Jyrki Huusko, Juha-Pekka Soininen, and Jari Nurmi. "Application Workload Modelling via Run-Time Performance Statistics." International Journal of Embedded and Real-Time Communication Systems 4, no. 2 (April 2013): 1–35. http://dx.doi.org/10.4018/jertcs.2013040101.
Full textAbstract:
Modern mobile nomadic devices for example internet tablets and high end mobile phones support diverse distributed and stand-alone applications that were supported by single devices a decade back. Furthermore the complex heterogeneous platforms supporting these applications contain multi-core processors, hardware accelerators and IP cores and all these components can possibly be integrated into a single integrated circuit (chip). The high complexity of both the platform and the applications makes the design space very complex due to the availability of several alternatives. Therefore the system designer must be able to quickly evaluate the performance of different application architectures and implementations on potential platforms. The most popular technique employed nowadays is termed as system-level-performance evaluation which uses abstract workload and platform capacity models. The platform capacity models and application workload models reside at a higher abstraction-level. The platform and application workload models can be instantiated with reduced modeling effort and also operate at a higher simulation speed. This article presents a novel run-time statistics based application workload model extraction and platform configuration technique. This technique is called platform COnfiguration and woRkload generatIoN via code instrumeNtation and performAnce counters (CORINNA) which offers several advantages over compiler based technique called ABSINTH, and also provides automatic configuration of the platform processor models for example cache-hits and misses obtained during the application execution.