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Ultra-Low Power Pipeline Structure Exploiting Noncritical Stage with Circuit-Level Timing Speculation

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Journal of Electronic Science and Technology 2013年第3期11卷 301-305页

作者： Tao Luo ya-juan he Ping Luo yan-Ming he Feng Hu the School of Microelectronics and Solid-State Electronics University of Electronic Science and Technology of China

With the increase of the clock frequency and silicon integration, power aware computing has become a critical concern in the design of the embedded processor and system-on-chip （SoC）. Dynamic voltage scaling （DVS） is an effective method for low-power designs. However, traditional DVS methods have two deficiencies. First, they have a conservative safety margin which is not necessary for most of the time. Second, they are exclusively concerned with the critical stage and ignore the significant potential free slack time of the noncritical stage. These factors lead to a large amount of power waste. In this paper, a novel pipeline structure with ultra-low power consumption is proposed. It cuts off the safety margin and takes use of the noncritical stages at the same time. A prototype pipeline is designed in 0.13 μm technology and analyzed. The result shows that a large amount of energy can be saved by using this structure. Compared with the fixed voltage case, 50% of the energy can be saved, and with respect to the traditional adaptive voltage scaling design, 37.8% of the energy can be saved.

关键词： Index Terms---Adaptive circuits dynamic voltagescaling exploiting noncritical stage ultra-low power.

Characterization of Fundamental Logics for the Sub-Threshold Digital Design

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Journal of Electronic Science and Technology 2013年第4期11卷 382-387页

作者： yan-Ming he ya-juan he yang-Ming Li Shao-Wei Zhen Ping Luo the School of Microelectronics and Solid-State Electronics University of Electronics Science and Technology of China

Digital circuits operating in the sub-threshold regime consume the least energy. The strict energy constraints are desired in the applications which work at the lowest possible supply voltage. On the other hand, the conventional design flow utilizes the technology library provided by the foundry with a fixed voltage boundary, which causes problems when the supply scales down to the sub-threshold regime. In this paper, we present a design methodology to characterize the existing cell library with Liberty NCX to facilitate the standard design flow. It is demonstrated in 0.13 μm complementary metal-oxide-semiconductor （CMOS） technology with the supply voltage of 300 mV.

关键词： Characterization digital circuit lowpower sub-threshold voltage technology library.

《实用儿科临床杂志》2009年第24卷中文主题词索引

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实用儿科临床杂志 2009年第24期24卷 I0001-I0008页

作者：欧阳鲜桃赵琼詹婷婷宋亚娟何亚南邱红晓张帆新乡医学院管理学院河南新乡453003

The TWO-LEVEL STABILIZED FINITE ELEMENT METHOD BASED ON MULTISCALE ENRICHMENT FOR The STOKES EIGENVALUE PROBLEM

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Acta Mathematica Scientia 2021年第2期41卷 381-396页

作者： juan WEN Pengzhan HUANG ya-Ling he Key Laboratory of Thermo-Fluid Science and Engineering of Ministry of Education School of Energy and Power EngineeringXi'an Jiaotong UniversityXi'an 710049China School of Sciences Xi'an University of TechnologyXi'an 710048China College of Mathematics and System Sciences Xinjiang UniversityUrumqi 830046China

In this paper,we first propose a new stabilized finite element method for the Stokes eigenvalue *** new method is based on multiscale enrichment,and is derived from the Stokes eigenvalue problem *** convergence of this new stabilized method is proved and the optimal priori error estimates for the eigenfunctions and eigenvalues are also ***,we combine this new stabilized finite element method with the two-level method to give a new two-level stabilized finite element method for the Stokes eigenvalue ***,we have proved a priori error estimates for this new two-level stabilized ***,numerical examples confirm our theoretical analysis and validate the high effectiveness of the new methods.

关键词： Two-level multiscale finite element method P_(1)/P_(1)elements the Stokes eigenvalue problem

Weak decays of doubly heavy baryons:B_(cc)→BD^(*)

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Chinese Physics C 2021年第4期45卷 130-152页

作者： Run-Hui Li juan-juan Hou Bei he ya-Ru Wang School of physical Science and Technology Inner Mongolia UniversityHohhot 010021China

The discovery of Ξ_(cc)^(++)has inspired new interest in studying doubly heavy *** this study,the weak decays of a doubly charmed baryon B_(cc)to a light baryon B and a charm meson D^(*)(either a pseudoscalar or a vector one)are *** our previous work,we calculate the short distance contributions under the factorization hypothesis,whereas the long distance contributions are modeled as the final state interactions,which are calculated with the one particle exchange *** find that the B_(cc)→BD^(*)decays'branching ratios are obviously larger,as they receive contributions of more polarization *** the decays that we investigate,the following have the largest branching fractions:BR(Ξ_(cc)^(++)→∑^(+)D^(*+))∈[0.46%,3.33%]estimated with τΞ_(cc)^(++)=256 fs;BR(Ξ_(cc)^(+)→AD^(*+))∈[0.38%,2.63%]and BR(Ξ_(cc)^(+)→∑^(0)D^(*+))∈[0.45%,3.16%]with τΞ_(cc)^(++)=45 fs;and BR(Ω_(cc)^(+)→Ξ^(0)D^(+))∈[0.27%,1.03%),BR(Ω_(cc)^(+)→∑^(0)D^(*+))∈[0.07%,0.44%],and BR(Ω_(cc)^(+)→∑^(0)D^(*+))∈[0.06%,0.45%] with τ_(Ω_(cc))^(+)=75 *** comparing the decay widths of pure color commensurate channels with those of pure bow-tie ones we find that the bow-tie mechanism plays an important role in charm decays.

关键词： doubly charmed baryon branching fraction final state interaction

Safety of an improved patent ductus arteriosus occluder for transcatheter closure of perimembranous ventricular septal defects with abnormally attached tricuspid chordae tendineae

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World Journal of Clinical Cases 2019年第5期7卷 562-571页

作者： Lu he ya-juan Du Ge-Sheng Cheng Yu-Shun Zhang Department of Structural heart Disease Xi'an Jiaotong University Medical College First Affiliated Hospital

BACKGROUND The off-label use of various devices has been reported for the transcatheter closure of perimembranous ventricular septal defects(PmVSD) because of serious complications, such as heart block and tricuspid regurgitation(TR),associated with conventional ventricular septal defect devices. However, whether certain defects such as PmVSD with abnormally attached tricuspid are fit for interventional treatment is still *** To explore the feasibility and safety of transcatheter closure of PmVSD with abnormally attached tricuspid chordae tendineae using an improved patent ductus arteriosus(PDA) *** We retrospectively analyzed 20 patients diagnosed with PmVSD with abnormally attached tricuspid chordae tendineae who underwent interventional treatment using an improved PDA occluder at our center from January 2012 to January 2016. Baseline characteristics and procedural and follow-up data were *** All 20 patients achieved procedure success. No heart block occurred during the operation. One patient had a transient complete right bundle branch block within48 h post-procedure and reverted to normal rhythm after intravenous injections of dexamethasone for 3 d. For all 20 patients, no residual shunt was observed by transthoracic echocardiography post-procedure. During the average follow-up period of 2.4 years, no severe TR was *** Using of the improved PDA occluder for the transcatheter closure of PmVSD with abnormally attached tricuspid chordae tendineae is a safe and promising treatment option. However, long-term follow-up in a large group of patients is still warranted.

关键词： Ventricular septal defect Transcatheter Patent ductus arteriosus occlude Tricuspid regurgitation Chordae tendineae

Clinical relevance of atrial septal aneurysm and patent foramen ovale with migraine

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World Journal of Clinical Cases 2018年第15期6卷 916-921页

作者： Lu he Ge-Sheng Cheng ya-juan Du Yu-Shun Zhang Department of Structural heart Disease Xi'an Jiaotong University Medical College First Affiliated Hospital

AIM To test the potential association between atrial septal aneurysm(ASA) and migraine in patent foramen ovale(PFO) closure patients through an observational, singlecenter, case-controlled *** We studied a total of 450 migraineurs who had rightto-left shunts and underwent PFO closure in a retrospective single-center non-randomized registry from February 2012 to October 2016 on the condition that they were aged 18-45 years old. Migraine was diagnosed according to the International Classification of headache Disorders, 3^(rd) edition and evaluated using the headache Impact Test-6(HIT-6). All patients underwent preoperative transesophageal echocardiography, contrast transthoracic echocardiography, and computed tomography or magnetic resonance imaging examinations, with subsequent fluoroscopy-guided PFO closure. Based on whether they have ASA or not, the patients were divided into two groups: A(PFO with ASA, n = 80) and B(PFO without ASA, n = 370). Baseline characteristics and procedural and follow-up data were reviewed. RESULTS Compared to group B, group A had an increased frequency of ischemic lesions(11.3% vs 6.2%, P = 0.038) and migraine with aura(32.5% vs 21.1%, P = 0.040). The PFO size was significantly larger in group A(P = 0.007). There was no significant difference in HIT-6 scores between the two groups before and at the oneyear follow-up after the PFO closure [61(9) vs 63(9), P = 0.227; 36(13) vs 36(10), P = 0.706].CONCLUSION Despite its small sample size, our study suggests that the prevalence of ASA in PFO with migraine patients is associated with ischemic stroke, larger PFO size, and migraine with aura.

关键词： Patent foramen ovale Migraine Atrial septal aneurysm Contrast transthoracic echocardiography Right-to-left shunt Transesophageal echocardiography

Optimal livelihood strategy for different poverty groups among farmers: a case study of the Qin-Ba Mountain area in South-Shaanxi, China

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Journal of Mountain Science 2020年第5期17卷 1206-1220页

作者： SU Fang YIN ya-juan School of Economics and Management Shaanxi University of Science&TechnologyXi'an 710021China

Achieving sustainable livelihood is the ultimate goal of poverty alleviation efforts in mountainous areas,and selecting an optimal livelihood strategy for different poverty-type farmers greatly improves farmers’livelihood capital,resists livelihood risks,and promotes sustainable *** farmers,optimal livelihood strategy means better employment opportunities,higher family income(or better income structure),and stronger employability or development *** paper classifies different types of farmers’poverty on the basis of a quantitative evaluation of farmers’livelihood capital in the Qin-ba Mountain Area in South-Shaanxi by using the k-means clustering method and subsequently the fuzzy evaluation method to evaluate the effectiveness of farmers’livelihood ***,the multi-attribute decision-making model is used to analyze the selection of optimal livelihood strategies for different poverty-type *** results suggest a significant difference in the selection of the optimal livelihood strategy for different poverty-type *** without financial and human capital choose to"go out to work,"farmers lacking natural capital choose to"acquire social insurance and government relief,"farmers without physical capital choose to"use loans,"and farmers lacking social capital choose to"use savings."Studying the selection of optimal livelihood strategies for different poverty-type farmers can help to propose targeted sustainable livelihood optimization programs for farmers and accelerate efforts to overcome poverty in mountainous areas.

关键词： Optimal strategy Livelihood capital Effectiveness evaluation Qin-Ba Mountain Area Shaanxi

Self-assembly Behavior of Rod-Coil-Rod Triblock Copolymers within a Planar Slit

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Chinese Journal of Polymer Science 2016年第7期34卷 838-849页

作者： ya-juan su 黄建花 Department of Chemistry Zhejiang Sci-Tech University Hangzhou 310018 China

The self-assembly behavior of sphere-forming R_5C_（30）R_5 triblock copolymers within a planar slit is studied by performing dissipative particle dynamics simulations. A sequence of novel structures which are not observed in bulk are formed within slits, including wetting layers, island-like structure, parallel cylinders, perpendicular cylinders and crosscylindrical structures. Perpendicular cylinders are always formed before the increase in the layers of parallel cylinders. A phase diagram of the assembled structures with respective to the slit property and height is thus presented. The rod length is found to have a significant impact on the rod alignment, and a disordered-ordered transition of rod orientation occurs with an increase in the length of rod blocks. Some special structures, such as parallel half-cylinders and arrowhead-shaped morphology, are observed when the rod length increases to a certain extent. Our results show that the property and height of the slit and rod length all influence the self-assembly of rod-coil-rod triblock copolymers.

关键词： Self-assembly Triblock copolymers Slit Simulation