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Wirelength is the most fundamental objective in placement because it also affects various placement metrics (routability, timing, etc.). Half-perimeter wirelength (HPWL) is a pervasive metric for circuit placement. However, preplaced blocks (i.e., blockages) might misguide an HPWL-based placer to generate a placement solution that incurs significant routing detours. Consequently, it is desirable to...
This paper proposes a design pattern based on the service-oriented architecture for the design of flexible distributed automation control system for substation automation systems. The design pattern is intended to be applied to control systems based on the leading standards for software development of smart grid: IEC 61850 and IEC 61499. The proposed design pattern models system requirements as orchestrators...
For the effective operation of series input modular systems, it is essential to maintain input voltage sharing (IVS) or keep output voltages/currents constant (OVC/OCC). This paper investigates the steady state performance of the series input multiple outputs (SIMO) system. Based on small signal analysis, the inherent instability mechanism of OVC/OCC control strategies is revealed. Since ensuring...
The paper has presented a new augmented buck converter to improve its transient performance. At first, an augmentation circuit based on diode-capacitor topology is introduced. The voltage across the inductor can be increased during load transients, and the rate of inductor current can be higher compared with conventional buck converters. Then, a hysteresis control algorithm based on output voltage...
Articulated human pose estimation is a fundamental yet challenging task in computer vision. The difficulty is particularly pronounced in scale variations of human body parts when camera view changes or severe foreshortening happens. Although pyramid methods are widely used to handle scale changes at inference time, learning feature pyramids in deep convolutional neural networks (DCNNs) is still not...
Traditional Structure-from-Motion (SfM) uses images captured by cameras as inputs. In this paper, we explore using light fields captured by plenoptic cameras or camera arrays as inputs. We call this solution plenoptic SfM or P-SfM solution. We first present a comprehensive theory on ray geometry transforms under light field pose variations. We derive the transforms of three typical ray manifolds:...
With the rapid growth of data, big data processing imposes unprecedented challenge to existing network infrastructure. Network Function Virtualization (NFV) is the key technology for network transformation. Considering the transmission and processing of big data, how to reduce the service time by deploying virtual network function (VNF) instances is a critical issue in network virtualization. We formulate...
Textual-visual matching aims at measuring similarities between sentence descriptions and images. Most existing methods tackle this problem without effectively utilizing identity-level annotations. In this paper, we propose an identity-aware two-stage framework for the textual-visual matching problem. Our stage-1 CNN-LSTM network learns to embed cross-modal features with a novel Cross-Modal Cross-Entropy...
In this paper, a kind of interference on chirp pluses in spaceborne SAR and the corresponding suppression method are introduced. This interference is a kind of multi-component linear frequency modulated (LFM) signal which is difficult to be suppression by classical elimination methods. According to the generation mechanism of interference, the mathematical model is established firstly. Moreover, the...
We used a high dielectric constant material, hafnium dioxide (HfO2) as the dielectric layer and N, N'-ditridecyl-3, 4, 9, 10-pervlene tetracarboxylic diimide (PTCDI-C13) as the active layer to fabricate low voltage-driven organic thin-film transistor (OTFT) devices. After modifying the surface of HfO2 by polyimide (PI), the electrical characteristics and stability of PTCDI-C13-based OTFTs were considerably...
In order to improve the ability of harmonic reduction at DC link of multi-pulse rectifier (MPR), the harmonic reduction mechanism at DC link of two kinds of 24-pulse rectifiers with double-tapped interphase reactor (IPR) or auxiliary single-phase full-wave rectifier (ASFR) was investigated. According to the configuration and Ampere-Turn balance with double-tapped IPR and single full wave rectifier,...
In order to meet voltage targets, energy storage cells are usually used in series. The imbalance of series-connected cells leads to the premature degradation and a decrease in the available energy of the entire pack. One practical approach to improve performance of the energy storage cell stack is to timely perform cells equalization, which is especially essential for a large pack. An optimization...
In order to improve the harmonic reduction ability of the multi-pulse rectifier, this paper proposes a multi-pulse rectifier based on harmonic reduction technology at DC link. The proposed rectifier employs two diode bridges, each followed by a Boost converter. By controlling the inductor current of Boost converter, the input line current of the proposed rectifier can be approximated to sinusoidal...
This paper investigates flyback auxiliary power supply system of the input series modular power electronic converter. Through utilizing the input series output independent (ISOI) structure, a modular auxiliary power supply scheme is proposed. And in order to ensure input voltage sharing (IVS) between each auxiliary power supply module, A novel master slave input voltage sharing control strategy is...
In order to enhance the ability of harmonic suppression for multi-pulse converters (MPCs). This paper proposes a novel pulse multiplication method at DC side of MPCs. The presented rectifier consists of a three-phase bridge parallel structure 12-pulse rectifier and a novel double winding tapped inter-phase converter (TIPC). The functions and characteristics of delta-connected autotransformer and ZSBT...
In order to enlarge the output current of the rectifier, a large current rectifier based on six windings isolated transformer is proposed. The proposed rectifier uses the six windings isolated transformer as the phase-shift transformer, and the primary windings of the transformer are connected in delta, the secondary windings are independent and provide three groups of single-phase voltage with 120°phase...
This paper proposes an adaptive hysteresis sliding mode control method for double-switch buck-boost converter. First a hysteresis sliding mode current controller is applied to the converter such that the converter has a limited switching frequency; and second, adaptive control is adopted in order to enable the converter to work at a fixed switching frequency. The change of the switching frequency...
This paper presents s new circularly polarized (CP) omnidirectional microstrip antenna array. The designed antenna array has back-to-back structure, four series-fed patch antenna elements on each side. The resonant bandwidth of this array is about 7.4% with center frequency 17.5 GHz. The antenna array has CP gain variation in the main lobe plane is around ±2.5 dBic, axial ratio (AR) in the main lobe...
One of the most challenging problems in aerospace engineering is the analysis of the separation trajectories by which a missile ejected from an aircraft. The attitudes of some static unstable missile are divergent quickly due to aerodynamic interference by the aircraft. Therefore, it is disadvantageous to missile's separation from aircraft safely. The attitude control strategy must be applied to avoid...
Sequences of duplicate code, either with or without modification, are known as code clones or just clones. Code clones are generally considered undesirable for a number of reasons, although they can offer some convenience to developers. The detection of code clones helps to improve the quality of source code through software re-engineering. Numerous methods have been proposed for code clone detection...
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