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Schedulability analysis for linear transactions under fixed priority hybrid scheduling

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第6期9卷 776-785页

作者： Zhi-gang GAO zhao-hui wu School of Computer Science and Technology Zhejiang University Hangzhou 310027 China

In hard real-time systems, schedulability analysis is not only one of the important means of guaranteeing the timelines of embedded software but also one of the fundamental theories of applying other new techniques, such as energy savings and fault tolerance. However, most of the existing schedulability analysis methods assume that schedulers use preemptive scheduling or non-preemptive scheduling. In this paper, we present a schedulability analysis method, i.e., the worst-case hybrid scheduling (WCHS) algorithm, which considers the influence of release jitters of transactions and extends schedulability analysis theory to timing analysis of linear transactions under fixed priority hybrid scheduling. To the best of our knowledge, this method is the first one on timing analysis of linear transactions under hybrid scheduling. An example is employed to demonstrate the use of this method. Experiments show that this method has lower computational complexity while keeping correctness, and that hybrid scheduling has little influence on the average worst-case response time (WCRT), but a negative impact on the schedulability of systems.

关键词： Real-time systems Hybrid scheduling Linear transactions Worst-case response time (WCRT) Schedulability analysis

Context-aware smart car: from model to prototype

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第7期10卷 1049-1059页

作者： Jie SUN zhao-hui wu Gang PAN College of Computer Science and Technology Zhejiang University Hangzhou 310027 China

Smart cars are promising application domain for ubiquitous computing. Context-awareness is the key feature of a smart car for safer and easier driving. Despite many industrial innovations and academic progresses have been made, we find a lack of fully context-aware smart cars. This study presents a general architecture of smart cars from the viewpoint of context- awareness. A hierarchical context model is proposed for description of the complex driving environment. A smart car prototype including software platform and hardware infrastructures is built to provide the running environment for the context model and applications. Two performance metrics were evaluated: accuracy of the context situation recognition and efficiency of the smart car. The whole response time of context situation recognition is nearly 1.4 s for one person, which is acceptable for non-time critical applications in a smart car.

关键词： Smart car Intelligent vehicle Context-aware Ubiquitous computing

Recent advances of the Semantic Web

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Journal of Zhejiang University-Science C(Computers and Electronics) 2012年第4期13卷 239-240页

作者： zhao-hui wu Guest Editor-in-Chief for this special issue Zhejiang University Hangzhou 310027China

The World Wide Web (WWW) has become an indispensable media in our daily *** is frequently used in our day-to-day operations to procure a solution for a difficult problem,communicate and socialize with others,reserve hotels and book tickets to arrange our trips,seek business opportunities,entertain ourselves,and so *** the Web,our life may not have been what it is ***,a number of questions remain:Has the Web reached its full potential? Can it change our life more than what we have seen? What will the Web look like 20 years from now? One key question out of all is:Could the Web be smarter and more intelligent than before,considering the overwhelming Web content generated at such an exponential rate?

关键词：语义Web 网页内容网络 WWW 万维网生活分发智能

Editorial:Brain-machine interface(BMI) and cyborg intelligence

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浙江大学学报C辑：计算机与电子（英文版） 2014年第10期15卷 805-806页

作者： zhao-hui wu Zhejiang University

Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past *** on B... 详细信息

关键词：脑机接口 BMI 电子人智慧机器智能 Intel 通信路径外部设备

Mismatched feature detection with finer granularity for emotional speaker recognition

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Journal of Zhejiang University-Science C(Computers and Electronics) 2014年第10期15卷 903-916页

作者： Li CHEN Ying-chun YANG zhao-hui wu College of Computer Science & Technology Zhejiang University

The shapes of speakers' vocal organs change under their different emotional states, which leads to the deviation of the emotional acoustic space of short-time features from the neutral acoustic space and thereby the degradation of the speaker recognition performance. Features deviating greatly from the neutral acoustic space are considered as mismatched features, and they negatively affect speaker recognition systems. Emotion variation produces different feature deformations for different phonemes, so it is reasonable to build a finer model to detect mismatched features under each phoneme. However, given the difficulty of phoneme recognition, three sorts of acoustic class recognition—phoneme classes, Gaussian mixture model(GMM) tokenizer, and probabilistic GMM tokenizer—are proposed to replace phoneme recognition. We propose feature pruning and feature regulation methods to process the mismatched features to improve speaker recognition performance. As for the feature regulation method, a strategy of maximizing the between-class distance and minimizing the within-class distance is adopted to train the transformation matrix to regulate the mismatched features. Experiments conducted on the Mandarin affective speech corpus(MASC) show that our feature pruning and feature regulation methods increase the identification rate(IR) by 3.64% and 6.77%, compared with the baseline GMM-UBM(universal background model) algorithm. Also, corresponding IR increases of 2.09% and 3.32% can be obtained with our methods when applied to the state-of-the-art algorithm i-vector.

关键词： Emotional speaker recognition Mismatched feature detection Feature regulation

An iterative computation method for interpreting and extending an analytical battery model

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第2期9卷 279-288页

作者： Neng-gan ZHENG zhao-hui wu Man LIN Qi-jia WANG School of Computer Science and Technology Zhejiang University Hangzhou 310027 China Department of Computer Science St. Francis Xavier University Antigonish NS B2G 2 W5 Canada

Battery models are of great importance to develop portable computing systems,for whether the design of low power hardware architecture or the design of battery-aware scheduling *** this paper,we present a physically justified iterative computing method to illustrate the discharge,recovery and charge process of Li/Li-ion *** discharge and recovery processes correspond well to an existing accurate analytical battery model:R-V-W's analytical model,and thus interpret this model *** method can also extend R-V-W's model easily to accommodate the charge *** work will help the system designers to grasp the characteristics of R-V-W's battery model and also,enable to predict the battery behavior in the charge process in a uniform way as the discharge process and the recovery *** are performed to show the ac-curacy of the extended model by comparing the predicted charge times with those derived from the DUALFOIL *** profiles with different combinations of battery modes were *** experimental results show that the extended battery model preserves high accuracy in predicting the charge behavior.

关键词： Analytical battery model lterative computation method Capacity response Charge Discharge

Immune checkpoint molecules:“new”kids on the block of skin photoimmunology

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Genes & Diseases 2021年第1期8卷 1-5页

作者： Wei Wang zhao-hui wu Department of Pathology and Laboratory Medicine University of Tennessee Health Science CenterMemphisTNUSA Center for Cancer Research University of Tennessee Health Science CenterMemphisTNUSA Center for Cancer Research University of Tennessee Health Science CenterMemphisTNUSA Department of Radiation OncologyUSA

Ultraviolet radiation(UVR)is a prominent etiological factor of the pathogenesis of skin diseases such as squamous cell carcinoma and *** exposure to the natural sources of UVR such as sunlight or artificially from tanning lamps has been linked to the increasing incidence of skin cancers in the United *** the skin inflammation,DNA damage and oncogenic mutation caused by UVR,UV exposure also plays a critical role in suppressing local and systemic immune responses which enable premalignant and cancer cells to escape immune surveillance.A variety of mechanisms have been reported to regulate the immune-suppressive effects of *** we discuss the current understanding of how UV modulates the local and systemic immunity,the recent progress in roles of immune checkpoint molecules in UVR-induced immune suppression,and how the crosstalk between the immune cells may shape the immune landscape of the skin upon UVR.

关键词： immunity inflammation Immune

Principal components of nuclear mass models

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Science China(Physics,Mechanics & Astronomy) 2024年第7期67卷 65-71页

作者： Xin-hui wu Pengwei zhao Department of Physics Fuzhou UniversityFuzhou 350108China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China

Principal component analysis(PCA)is employed to extract the principal components(PCs)present in nuclear mass models for the first *** effects from different nuclear mass models are reintegrated and reorganized in the extracted *** PCs are recombined to build new mass models,which achieve better accuracy than the original theoretical mass *** comparison indicates that using the PCA approach,the effects contained in different mass models can be collaborated to improve nuclear mass predictions.

关键词： nuclear mass principal component analysis nuclear models statistical methods

A comparison of core–shell Si/C and embedded structure Si/C composites as negative materials for lithium-ion batteries

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Rare Metals 2021年第9期40卷 2440-2446页

作者： Shuai-Jin wu zhao-hui wu Sheng Fang Xiao-Peng Qi Bing Yu Juan-Yu Yang Grinm Group Co. Ltd.Beijing 100088China General Research Institute for Nonferrous Metals Beijing 100088China China Automotive Battery Research Institute Co. Ltd.Beijing 101407China

Silicon materials have attracted wide attention as negative materials due to exceptional gravimetric capacity and abundance. The strategy of using nano-silicon materials as structural units to construct nano/micro-structured silicon-based negative materials for lithium-ion batteries has come into sight in recent years. In order to provide guidance for the material structure design of micro-sized silicon-based negative materials in practical application, in this work, two commercialized nano/micro-structured silicon-based negative materials with a specific capacity of about 650 mAh·g^(-1) were investigated and compared in the aspects of material microstructure, electrochemical performance of half cells, and electrode morphological evolution during cycling. The cycling performance(with capacity retention ratio of about 17% higher after 100 cycles) and electrode structure maintenance of the embedded structure Si/C material are superior to those of core–shell Si/C material. This research can provide guidance on design and application of nano/micro-structured silicon-based negative materials.

关键词： Lithium-ion battery Negative materials Silicon-based materials Material structure