The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
We present a phenomenological model correlating optical return loss and amplitude of fringes in transmission spectrum due to distributed backscattering in high-index-contrast waveguides. The model is validated experimentally using four different waveguide cross sections.
To enhance the safe operation of modern railway vehicles, an online condition monitoring scheme is proposed for vehicle suspension systems. The core technology of the scheme is based on the average correlation signals based stochastic subspace identification (ACS-SSI) algorithm which allows system identification to be implemented reliably with output signals only that have strong noise and nonlinearity...
The structure design of ceramic package for packaging system in package is introduced in this paper. The reliability experiments of multi-layer ceramic package were simulated and analyzed by using the finite element method. We mainly studied the influence of the side size and sealing ring size on the reliability of the ceramic package structure, analyzed the stress and strain distribution of the ceramic...
To investigate the influence of sectionalized stators on shaft voltage in integer slot permanent magnetic synchronous machine (PMSM), an aid of magnet circuit and analytical method is proposed to deduce the shaft voltage, whilst segment and pole number combinations are further discussed. Finite element method (FEM) is used to verify the accuracy of above qualitative analysis. The influence of various...
Production-quality parallel applications are often a mixture of diverse operations, such as computation- and communication-intensive, regular and irregular, tightly coupled and loosely linked operations. In conventional construction of parallel applications, each process performs all the operations, which might result inefficient and seriously limit scalability, especially at large scale. We propose...
This paper points out a new telltale trace – the characteristic of perspective distortion (CPD), for the image forensics of faces. The perspective distortion is determined by the position of image shooting, and it is often overlooked when creating a forgery, which results in the inconsistency between the claimed camera parameters and the CPD in the face image. To investigate this consistency problem,...
Data analytics is undergoing a revolution in many scientific domains, and demands cost-effective parallel data analysis techniques. Traditional Java-based Big Data processing tools like Hadoop MapReduce are designed for commodity CPUs. In contrast, emerging manycore processors like the Xeon Phi have an order of magnitude greater computation power and memory bandwidth. To harness their computing capabilities,...
We have demonstrated photonic packaging compatible with standard, high-throughput, microelectronics assembly lines. We show a 1.3dB fiber-to-chip loss and 1.1dB chip-to-chip loss. We discuss the rationale behind this approach and compare to other packaging directions.
We report on the first measurement of distributed backscattering in metamaterial (subwavelength grating) waveguides. We find distributed backscattering to be < −50 dB/mm in samples fabricated using a CMOS-integrated Si photonic production process.
This paper presents an extension to MPI supporting the one-sided communication model and window allocations in storage. Our design transparently integrates with the current MPI implementations, enabling applications to target MPI windows in storage, memory or both simultaneously, without major modifications. Initial performance results demonstrate that the presented MPI window extension could potentially...
Hardware accelerators have become a de-facto standard to achieve high performance on current supercomputers and there are indications that this trend will increase in the future. Modern accelerators feature high-bandwidth memory next to the computing cores. For example, the Intel Knights Landing (KNL) processor is equipped with 16 GB of high-bandwidth memory (HBM) that works together with conventional...
NHK has proposed a famous 3D audio system: 22.2 multi-channel system, but its loudspeakers are too many and are troublesome to put in home. Ando and Wang has proposed two simplification methods to reduce its channel number, but only 3D sound field at the central listening point can be recovered well by NHK 22.2 system and its simplified systems, the listening experience at a non central listening...
For cone-cylinder targets, sliding-type scattering center is the most dominant nonideal scattering models. This nonideal phenomenon induces defocusing in radar imagery since it slides on the edge discontinuity with the change of incident angle. This paper proposes a method to discriminate among the ideal-type and sliding-type scattering centers on the cone-cylinder target based on the deviation degree...
In this paper, we describe our implementation for N-body simulation with the aid of FPGA, GPU and CPU. TreePM, which is a common algorithm for N-body simulation and meets our demands well, is chosen here. We split treePM algorithm into several parts, and assign them to different accelerators depending on the features of the operation. Moreover, partially dynamically reconfigurable FPGA architecture...
We report backscattering of −19 to −36 dB per 1mm of waveguide length. We find the dependence of backscattering intensity on waveguide geometry and polarization to be consistent with backscattering being dominated by sidewall defects.
In the field of high-performance and energy-efficient scientific computing, FPGAs are promising candidates. In this paper, we show a case study of applying FPGA-based system for Modified Newtonian Dynamics (MOND) cosmological simulation. The numerical simulation is based on TreePM algorithm of N-body problem. TreePM algorithm combines the PM (Particle Mesh) method on large scales with a tree method...
Next-generation supercomputers will feature more hierarchical and heterogeneous memory systems with different memory technologies working side-by-side. A critical question is whether at large scale existing HPC applications and emerging data-analytics workloads will have performance improvement or degradation on these systems. We propose a systematic and fair methodology to identify the trend of application...
Idle periods on different processes of Message Passing applications are unavoidable. While the origin of idle periods on a single process is well understood as the effect of system and architectural random delays, yet it is unclear how these idle periods propagate from one process to another. It is important to understand idle period propagation in Message Passing applications as it allows application...
Identifying the consumption patterns of electric customers and grouping them to classes according to their load characteristics can be very meaningful for power supply and demand side management in smart grid. Previously, tariff structures are mainly based on the type of activity. However, the type of activity and electrical behavior of the customer have poor relationship. Using clustering techniques...
The word-level sentiment analysis is an essential issue in opinion mining. One challenge in this field is that not so many lexical items as expected have been labeled with sentimental opinions, especially in Chinese. There are two ways of rating words: one is manual marking which costs lots of resources, energy and time; the other is machine marking which is efficient, convenient and time-saving....
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.