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In this paper, we address energy management for heating, ventilation, and air-conditioning (HVAC) systems in buildings, and present a novel combined optimization and control approach. We first formulate a thermal dynamics and an associated optimization problem. An optimization dynamics is then designed based on a standard primal-dual algorithm, and its strict passivity is proved. We then design a...
Energy crisis and environmental pollution are a serious threat to human survival and sustainable development. To alleviate the energy crisis and maintain the living environment of mankind, people develop and utilize new energy sources such as solar energy and wind energy. In order to ensure the safe and reliable use of the battery, and improve the performance of the battery after group, the battery...
With the rapid development of mobile Internet, the ways in which users access the network become diverse, which provides much convenience for us to collect huge amount of users' behavior information. In this paper, we combine data acquisition based on wireless access and brand analysis innovatively. This paper analyzes proportions of mobile terminal brands on campus using the data collected from WiCloud...
The study of the synchronization problems in wireless sensor networks (WSNs) is increasingly significant. Some researchers found that the network topology has an important impact on the convergence performance of the synchronization in WSNs. According to the feature of WSNs, we use random geometric graph (RGG) to describe the model of WSNs. And the degree distribution in RGG is similar to binomial...
Semantic query is a common natural language process task for many application scenarios. Given an input phrase, the phrases in a corpus with the exact and similar meanings are expected to be responded. As the exact spelling match cannot satisfy the semantic requirements especially when the query phrase has no common words with the targeted ones, the approaches based on word embedding vector learned...
This paper presents a novel reconfigurable dual-band bandstop filter with independently controlled stopbands and constant absolute bandwidths (ABWs). The fundamental structure is based on λ/4 varactor-loaded resonators, and the key to constant ABW is choosing proper coupling regions between resonators. Theoretical analysis and calculation are carried out to determine physical parameters of the coupling...
A tri-band balanced bandpass filter (BPF) is presented based on novel multi-stub resonators, which are modified from the conventional multi-mode resonator. From the theoretical analysis, the first three resonance modes can be flexibly controlled under differential-mode (DM) operation. The extra stub-stub couplings are introduced to increase the degrees of freedom in extracting the coupling coefficients,...
This paper investigates the influence of internal control on executive pay-performance sensitivity in public welfare SOE and commercial SOE in China by empirical study. Finally, we find that the implementation of internal control can not improve executive pay-performance sensitivity in all kinds of SOE, which means the reform of state-owned enterprises in China can not be the same mode. We need to...
We propose an improved image defogging algorithm based on Retinex, which consists of two parts: HSV color enhancement and RGB space detail enhancement. Through the single-scale Retinex algorithm to enhance the brightness component, in HSV space to introduce enhanced adjustment factor, to avoid color distortion and noise amplification, to achieve the effect of color enhancement. In the RGB space, based...
In this paper we propose a novel approach for designing digital circuits that uses the variance of a signal to represent Boolean logic levels. The variance-based logic (VBL) representation enables embedding of rectification and multiplication modules within the basic logic cells and unlike AC-coupled or energy-recovery logic circuits the proposed approach obviates the need for any phase synchronization...
Wireless Sensors Networks (WSN) have become vital in many areas and critical applications. Some applications require a reliable network and less maintenance, especially the power consumption. ZigBee standard shows the ability to be used for many applications that require low data transmission and low power consumption. The standard helps the overall network to reduce worries about the sensors power...
Geothermal Heat Pump (GHP) systems are heating and cooling systems that use the ground as the temperature exchange medium. GHP systems are becoming more and more popular in recent years due to their high efficiency. Conventional control schemes of GHP systems are mainly designed for buildings with a single thermal zone. For large buildings with multiple thermal zones, those control schemes either...
With off-line power supplies moving towards MHz switching frequency range, the converter's bus capacitor becomes the bottleneck of further improvement of power density. Partial constant power operation is effective in reducing the bus capacitance and capacitor current stress for low power applications. However, its impact on circuit operation and circuit design have not been studied thoroughly. With...
Despite being employed in burgeoning efforts to improve power delivery efficiency, integrated voltage regulators (IVRs) have yet to be evaluated in a rigorous, systematic, or quantitative manner. To fulfill this need, we present Ivory, a high-level design space exploration tool capable of providing accurate conversion efficiency, static performance characteristics, and dynamic transient responses...
In the context of multivariate information such as parking lots, individuals and commerce, we use K2 algorithm to do structure learning of Bayesian network and use maximum likelihood estimate algorithm to do parameter learning of Bayesian network. Bayesian network is established to study parking behavior under the influence of multi-information. This paper analyses the preferences of vehicle owners...
A new generation memory, Non-Volatile Memory (NVM), such as Phase-Change Memory (PCM), has been adopted together with DRAM in the main memory to form the hybrid main memory for low energy consumption and high capacity. The biggest challenge of hybrid memory is how to decrease the average memory access cost for the higher cost of NVM's read/write operation. Currently, most researches are based on migration...
A dual-band balanced bandpass filter (BPF) is proposed using stub-loaded resonators. Based on the theoretical analysis, it is found that the electrical performances of the differential-mode (DM), such as center frequencies and bandwidths can be controlled independently. The center frequency ratios of the two DM passbands can range from 1 to 2.6. The resonant frequencies of the common-mode (CM) are...
This paper presents a real-time decentralized temperature control scheme via Heating Ventilation and Air Conditioning (HVAC) systems for energy efficient buildings, which balances user comfort and energy saving. Firstly, we introduce a thermal dynamic model of building systems and its approximation. Then a steady-state optimization problem is formulated, which aims to minimize the aggregate deviation...
This paper presents a comparison study of three isolated DC/DC circuit topologies, LLC resonant circuit, phase shift bridge circuit and phase shift quasi switched capacitor (QSC) circuit. The device stress of three circuits is compared using total switching device power (SDP) which can be used as an indicator of circuit efficiency, device cooling requirement, device packaging requirement and cost...
Wide bandgap devices (WBGs) allow Power Factor Correction (PFC) circuits to operate at MHz frequency which leads to a better power density. Compared with kHz operation, MHz PFC in critical conduction mode (CrM) yields larger inductor valley current during the switch soft turn-on. Moreover, the input current distortion near grid voltage zero crossing has not been taken into account in the traditional...
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