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A seamless switching control strategy for multi-terminal flexible HVDC system, presented in this paper, can maintain DC voltage of system stable and ensure a reasonable power allocation of converter stations. This strategy improves active channels of the outer loop, which enhances flexibility and selectivity of control by setting droop control mode cover fixed DC voltage control mode and constant...
Modern computer is lack of the counter to record the reboot times. However a reboot counter is a valuable primitive for system security. In this paper, we propose a method to build reboot counter which is tamper-resistant. To the end, a reboot counter is divided into many shares with threshold secret sharing, and these shares hide dispersedly in the disk. To protect these shares, the addresses of...
Our observation shows the limit of subjective logic that it treats equally the opinions and fails to operate them with their weights. To address this problem, we propose four novel operators including cumulative weighted fusion operator, averaging weighted fusion operator, cumulative weighted unfusion operator and cumulative weighted unfusion operator. These novel operators are capable of fusing or...
Different from data aggregation, in the process of transmitting data without aggregation from leaf node to the sink, the size of the integrated data increases. In this paper, we define that the lifetime of the node is the rounds of transmitting integrated data, which includes its own data and the received data from its children, in view of the feature of data gathering without aggregation. For different...
Memory accesses limit the performance of stream processors. The stream compiler exploits the reuse of records distributed on different ALU clusters by introducing inter-cluster communications, which decreases the program performance. The paper presents the Stream Transpose (ST) approach to exploit such reuse. The approach, by reorganizing the data, puts data that have been distributed on neighboring...
The performance of off-chip DDRx SDRAM has been greatly restricted by the single physical page that can be activated for each DRAM bank at any time. To alleviate this problem, an on-chip virtual open page buffer (VOPB) for multi-core multi-thread processor is proposed. The VOPB maintains a number of virtual active pages for each bank of off-chip memory, which effectively increases the maximum number...
It is a challenge to verify integrity of dynamic control flows due to their dynamic and volatile nature. To meet the challenge, existing solutions usually implant an “attachment” in each control transfer. However, the attachment introduces additional cost except performance penalty. For example, the attachment must be unique or restrictedly modified. In this paper, we propose a novel approach to detect...
A brief analysis of improved effectiveness and reliability of the third-generation Automatic Link Establishment (ALE) system is presented by comparing the performance with the second generation. And the channel coding theory in the second and third-generation ALE system is also introduced separately. With the channel coding performance simulation results, we conclude that there is an obviously improvement...
As the complex characteristics of underwater acoustic communication channel, the underwater acoustic communication data rate is limited. In order to realize the underwater voice communication, the required speech data compression rate should be much higher. So we select TLV320AIC12 and AMBE-3000 to realize the design of voice codec module. The TLV320AIC12 is a high-performance A/D & D/A chip with...
With the development of spatial information industry, traditional systems that are limited by scalability and reliability cannot well satisfy the huge amount of service need. The cloud computing has advantages of good scalability, high reliability and high availability, which can provide powerful technical support to promote the capability of spatial information service system. This paper proposed...
This paper differentiated and analyzed the coupling mechanism of stress and fluid flow in fractured rock mass. It pointed out that the structural plane between the water and the rock mass is not only a physical medium in the process of water-rock coupling, but also a mechanical medium. Then a seepage model has been proposed, i.e. “water-rock-structural plane” model. This model can describe the seepage...
LS2 is the logic to reason about the property of trusted computing. However, it lacks the capability of modeling the isolation provided by virtualization which is often involved in previous trusted computing system. With the support of changed LS2, we model three types of isolation. Moreover, we formally analyze the integrity measurement property of Trust Visor proposed recently which provides the...
Trusted platform module (TPM) has little computation capability, and it is the performance bottleneck of remote attestation. In the scenario where the server is the attestation-busy entity which answers attestation requirement frequently, the massive delay is inevitable. Without the modification to TPM, we propose Batch Integrity Report Protocol (BIRP) to overcome the performance bottleneck. B-IRP...
Commercial GNSS RF signal simulators are expensive and few of them provide modernized GPS L2C signal simulation capability so far. Based on the SDR architecture of a GNSS RF signal simulator developed by Beihang University, China, this paper focuses on the design and implementation of the L2C IF signal generator. The calculation and updating of waveform control parameters, the modulation of baseband...
Robust adaptive multiuser detection schemes are developed for direct-sequence code-division multiple-access (DS-CDMA) multipath frequency-selective fading channels. Multiple access interference (MAI) and intersymbol interference (ISI) are presented in identical format in the expanded signal subspace, which provides convenience for symbol-by-symbol multiuser detection. The proposed multiuse detectors...
Net primary productivity (NPP) estimation is an important study field of global change and terrestrial ecosystem. Here, we present an integrated modeling and analysis framework for researching climate change using NPP as an ecosystem indicator. It's brings together remote sensing, GIS and an ecosystem simulation model without requiring users to have any knowledge of any other specific software. Satellite...
Robust adaptive multiuser detection schemes are developed for direct-sequence code-division multiple-access (DS-CDMA) multipath frequency-selective fading channels. Multiple access interference (MAI) and intersymbol interference (ISI) are presented in identical format in the expanded signal subspace, which provides convenience for symbol-by-symbol multiuser detection. The proposed multiuse detectors...
It is challenging to design a high performance memory sub-system for heterogeneous multicore processor FT64-3, which features 18 on chip 64-bit float function units. In this paper, we propose a parallel stream memory architecture that can greatly leverage the design idea of exploiting memory level parallelism for higher memory throughput., Experimental results and analysis for kernel algorithms are...
Effective control strategies for reliable photovoltaic (PV) grid-connected systems are needed to efficiently use solar energy, an abundant and clean renewable energy source. A space vector pulse width modulation (SVPWM) has been widely applied in the current control of three-phase voltage source inverters (VSIs). The control strategy combines a constant voltage tracking method for the variable photovoltaic...
Heterogeneous multicore processor can integrate merits of different architecture, so it can achieve peak performance as high as processors with special architecture, while keeping as flexible as traditional general purpose processors at the same time. It is a challenge to design a memory sub-system for FT64-3, which is a heterogeneous multicore processor with 18 float function units. In this paper,...
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