A large portion of the power consumption data centers can be attributed to cooling. In dynamic thermal management mechanisms for and servers, setpoints are typically chosen statically conservatively, which leaves significant room improvement in form improved energy efficiency. this paper, we propose two hierarchical thermal-aware optimization techniques that complementary each other achieve (i) lower overall system with no performance penalty or (ii) higher within same budget. At center...

As the core component of an engine, vibration characteristics blades directly affect stability and lifespan engine. Thus, monitoring status is essential. This paper presents improvement on blade tip timing (BTT) method based Composite Reference. The conventional BTT method, when computing displacement, typically presumes a constant rotor speed per revolution, which fails to account for rotor’s instantaneous state conditions accurately. In this study, space equations angular velocity position...

Constant amplitude zero autocorrelation (CAZAC) sequence, which is one type of polyphase codes, has many applications in channel estimation and time synchronization, since it good periodic correlation properties. Now also introduced to long-term evolution (LTE) 3rd Generation Partnership Project (3GPP) random access procedure as preamble signature. Based on the introduction CAZAC sequences correlation, this paper gives a simple detection structure preambles. Simulation results indicate that...

Benefiting from the flexibility and low operational cost, dispatching unmanned aerial vehicles (UAVs) to collect measurements is promising in spectrum cartography (SC). The main goal optimize trajectory of an UAV seek most informative measurement under environment with dynamic emitters. In this letter, we formulate a Markov Decision Process find optimal flight that maximizes accuracy SC minimizes energy consumption. However, due unavailable instantaneous feedback about SC, existing methods...

A conical conformal leaky-wave antenna based on substrate integrated waveguide (SIW) technology is proposed and demonstrated in this paper. This conforms to a shape surface with the angle of 40°. It has narrow beam that scans from 80° 97° varying frequency (34 GHz~37 GHz). Both nonconformal antennas are fabricated through standard PCB process. Their performances compared within desired frequency.

A broadband high-gain planar array antenna is proposed for 60 GHz wireless communication applications. It consists of two layers to achieve a compact topology through standard PCB fabrication process. The wideband substrate integrated waveguide (SIW) feeding network placed in the bottom layer while radiating patches are on top layer. novel structure widen bandwidth terms impedance matching and gain. Measured results fabricated show about 14.6% reflection coefficient (S11<;-10dB) frequency...

Abstract This paper examines the linkage between foreign direct investment ( FDI ) and productivity of domestic firms, paying particular attention to local institutions. Using Chinese manufactures from 1998 2007, we find strong evidence that negatively affects firms. Firm in regions with better institutions suffers more presence owing production contraction, labor cost increases innovation deterrence.

The evolution of TD-SCDMA is LTE TDD. But the scarcity spectrum resource below 1GHz one most serious problems in deployment Digital Dividend spectrum, which free up for conversion from analog TV to digital TV, ideal frequency band deploy TDD 1GHz. So coexistence issue between Terrestrial Television Broadcast (DTTB) and Spectrum important plan [1]. In this paper, interference DTTB analyzed using deterministic analysis method Monte Carlo simulation based on standard China. results show that...

With the development for ubiquitous computing, smart home services will not only be limited at household space, but also scope of out range geographical constraint, and service support activities each member even home. In this paper, we propose a with intelligent monitoring controlling system based on Wi-Fi, which mainly provides three kinds services: monitor status appliances, through depended devices' configuration information to control setting feedback device user by cycle; appliances....

Deep learning (DL) has exhibited notable effectiveness in channel estimation for orthogonal frequency division multiplexing (OFDM) systems. However, most existing neural networks have not explicitly accounted the intercarrier interference (ICI) and fail to achieve desirable performance under high-mobility air-ground communication environments. To address this problem, a modified Involution-based Channel Estimation Network (InvoEsNet) is proposed letter, which designed cope with ICI. The...

LTE system will share the same frequency band with fixed-satellite service (FSS) in 3400 ~ 3600 MHz, which has been identified as one of candidate bands for future development mobile systems. In this paper, deterministic analysis and Monte Carlo simulation are adopted to study co-existence two systems 3400~3600 MHz based on FSS parameters China. analysis, three types interference, co-channel adjacent channel interference overdrive, studied. Then probability earth station is simulated using...

In this article, a novel two-dimensional (2D) imaging scheme for forward-looking missile-borne radar systems is proposed, where the vortex electromagnetic (EM) waves with different orbital angular momentum (OAM) modes are transmitted. First, EM waves's model established. Then, two processing algorithms, i.e. FFT and sparse recovery proposed. Finally, simulation results confirm proposed algorithms. Compared traditional radar, OAM-based system can not only achieve slant range resolution, but...

In order to achieve intelligence control of air purification and sweeper combined robot, it is developed in this paper a set system, designs the hardware software system based on description main function especially for design step motor open close door. The has merit high degree realize remote dust concentration clearance floor. cooperative between purifier sweeping machine realized calculation thickness floor efficiency energy saving cleaning purification.

ECG acquisition and monitoring system has important significance in the diagnosis of cardiovascular disease maintenance health. This article thoroughly systematically introduces design A low power portable system. The functions include acquisition, signal conditioning, digital filtering, dynamic electrocardiogram display, data local storage remote transmission, etc. unit uses ADI monitor to simulate front-end AD8232, main control adopts 16-bit low-power MSP430F5529 MCU Texas Instrument,...

Due to the inherent openness of wireless channels, data transmission in user-centric ultra-dense networks (UUDNs) is vulnerable eavesdropping and malicious jamming attacks (EJA). This paper addresses clustering, beamforming, artificial noise design combat with EJA, an accelerated deep reinforcement learning (DRL) based approach has been proposed for downlink UUDNs from a security, reliability energy efficiency (SREE) perspective. In contrast existing approaches, divides UE's communication...

This paper presents a network attack authentication method based on digital watermark technology, CRC16 as is added to the original data, combined with simulation model of performance analysis.It proved that can detect false data in real time conditions, provide new choice for information security.At same time, watermarking analyzed detail through simulation, and feasibility superiority real-time protection further demonstrated.The current voltage are obtained by simple model, waveforms...

UO 2 is an important nuclear fuel, also has potentials in the field of functional materials. In this work, electrochemical behavior 2+ LiCl-KCl molten salt (500 °C) and effects reduction potential (−0.1 to −1.0 V) uranyl concentration (0.5 wt% 4.0 wt%) on morphology grain size electrolytic products were studied. The was found playing a decisive role cathodic products. When ≤−0.4 V (vs Pt(II)/Pt), dendritic cracked characteristic crystal appeared. average current density had positive...