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A class of extended angular rate-based coning algorithms is presented to advance coning correction performance. Through reconfiguring some structure parameters of the coning algorithm based on a structure containing cross-product of angular rates, cross-product of angular increments, and cross-product of angular rate and increment, the extended coning algorithm is obtained. Frequency Taylor-series...
We propose a potential architecture of a microrobotic platform for transporting contrast agent inside the body in contrast-enhanced medical imaging (CMI), and analyze the targeting performance using a “touchable” molecular communication model. The remote controllability and trackability of microbots lead to such a “touch-communication” (TouchCom) mode. These microbots (i.e., message carriers in the...
Motivated by the high system complexity of today's datacenters, a large body of related studies tries to understand workloads and resource utilization in datacenters. However, there is little work on exploring unsuccessful job and task executions. In this paper, we study three types of unsuccessful executions in traces of a Google datacenter, namely fail, kill, and eviction. The objective of our analysis...
Visualization technology powers up the cloud computing paradigm and inevitably raises concerns about performance isolation of collocated virtual machines (VM). It is imperative for public cloud providers to guarantee performance targets for tenants' VMs while respecting strict business confidentiality, e.g., having no information on applications nor their performance. A large body of related work...
Big-data applications are becoming the core of today's business operations, featuring complex data structures and high task fan-out. According to the publicly available Google trace, more than 40% of big-data jobs do not reach successful completion. Interestingly, a significant portion of tasks of such failed jobs undergo multiple types of repetitive failed executions and consume a non-negligible...
Heat assisted magnetic recording (HAMR) is considered to be the next major hard disk drive (HDD) technology for areal densities beyond ∼1.5 Tb/in2 [1]. In HAMR, each high anisotropy magnetic grain is heated close to, or above, its Curie temperature (Tc), then freezed in a new magnetization direction with an effective magnetic field as the grain cools down. As recent theoretical recording simulations...
This paper presents a novel hybrid-flux magnetic gear, which integrates a transverse-flux magnetic gear and an axial-flux magnetic gear into a single unit. Compared to its conventional counterparts, the proposed magnetic gear transmits a relatively high torque density. When compared to the transverse-flux magnetic gear, this new structure employs an extra iron segment between the low-speed rotor and...
Nd-Fe-B and Pr-Fe-B films are proper magnetic material for application in micro electro mechanical systems (MEMS) and magnetic recording media due to their high magnetic performance such as huge magnetocrystalline anisotropy energy (Ku), high anisotropy field (Hk), large coercivity (Hc), and huge maximum energy product [(BH)max] [1-4]. Usually, in order to enhance the magnetic performances of Nd(Pr)-Fe-B...
Layers of magnetic materials from several nanometers to several micrometers in thickness are in wide use for applications including electronics, and magnetic recording media. In the last two decades the areal density of data storage and the data transfer rate in magnetic recording systems have been drastically improved. The magnetic damping remains among the factors that limit the switching speed...
Nano/Micro-scale magnetic sensors have been comprehensively investigated in recent decades. Among these sensors, anisotropic magnetoresistive (AMR) magnetic sensors have been well known for its simple and compact configuration. Recently, some researchers demonstrated that the magnetoresistance of a magnetic nanobar array can be changed by applying an external magnetic field orthogonal to the nanobar...
By translationally moving a magnetic source above a conductive plate guideway both levitation and drag forces are created. Unfortunately, the electrodynamic drag force can be quite high [1]. Kratz studied a double Halbach array topology, such as shown in Fig 1 [1], and used a simple curve fitting approximation to model the forces. Kratz experimentally showed that a significant reduction in drag force...
Spinel ferrites have been extensively used in the design and implementation of electromagnetic interference (EMI) suppressors and EM wave absorption materials in the megahertz frequency range. It is well known that EMI absorbing magnetic materials require high initial permeability and loss factor. MnZn and NiZn spinel ferrites are often used in the lower frequency range (< 300 MHz) due to the limit...
In recent decades, magnetodielectric (MD) materials have attracted a great deal of interest for both their unique physical properties as well as their potential as enabling materials in such applications as memory devices, electric field-controlled microwave resonance devices, etc.[1]. The magneto-electric effect has been observed in nature for very few single-phase materials, but many multiphase...
La1−xSrxMnO3 half-metal manganites attract much attentions due to the colossal magnetoresistance (CMR) effect1 related to the Griffiths singularity2 with a critical percolation threshold (x=∼0.08). For a ferromagnetic (FM) insulating homogeneous phase of bulk La0.9Sr0.1MnO3 (TC ∼ 150 K), the Griffiths phase which contains both FM and paramagnetic (PM) domains could be induced by intrinsic inhomogeneity...
Big-data applications are being increasingly used in today's large-scale data enters for a large variety of purposes, such as solving scientific problems, running enterprise services, and computing data-intensive tasks. Due to the growing scale of these systems and the complexity of running applications, jobs running in big-data systems experience unsuccessful terminations of different nature. While...
While workload collocation is a necessity to increase energy efficiency of contemporary multi-core hardware, it also increases the risk of performance anomalies due to workload interference. Pinning certain workloads to a subset of CPUs is a simple approach to increasing workload isolation, but its effect depends on workload type and system architecture. Apart from common sense guidelines, the effect...
Due to their large conversion between magnetic and electrical energy at room temperature, multiphase magnetoelectric or multiferroic materials have received considerable attention from the Spintronics' community.[1] The multiferroic composites or heterostructures are considered to have great potential use for next generation multifunctional devices such as sensors, transducers, filters, high frequency...
Electromagnetic absorbers, consisting of the magnetic particles suspended in a nonmagnetic matrix, have been widely used in the telecommunication industry to suppress electromagnetic interference (EMI) [1]. The magnetic material absorbers are required to have high permeability in the vicinity of resonance frequency due to the increasing working frequency of next generation telecommunication devices...
Conventional spin-transfer torque random access memory (STT-RAM) is a promising technology due to its non-volatility and dense cell structure. However, the long switching time of magnetic tunneling junction (MTJ) limits the write speed of the STT-RAM. In order to improve the write performance, a Spin-Hall Effect (SHE) assisted STT-RAM structure (SHE-RAM) has recently been proposed [1]. SHE effect...
In large-scale data enters, software and hardware failures are frequent, resulting in failures of job executions that may cause significant resource waste and performance deterioration. To proactively minimize the resource inefficiency due to job failures, it is important to identify them in advance using key job attributes. However, so far, prevailing research on datacenter workload characterization...
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