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A Study on Modeling and Optimization of Memory Systems

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Journal of Computer Science & Technology 2021年第1期36卷 71-89页

作者： jason Liu Pedro Espina Xian-He Sun School of Computing and Information Sciences Florida International UniversityMiamiFL 33199U.S.A Department of Computer Science Illinois Institute of TechnologyChicagoIL 60616U.S.A

Accesses Per Cycle(APC),Concurrent Average Memory Access Time(C-AMAT),and Layered Performance Matching(LPM)are three memory performance models that consider both data locality and memory assess *** APC model measures the throughput of a memory architecture and therefore reflects the quality of service(QoS)of a memory *** C-AMAT model provides a recursive expression for the memory access delay and therefore can be used for identifying the potential bottlenecks in a memory *** LPM method transforms a global memory system optimization into localized optimizations at each memory layer by matching the data access demands of the applications w.th the underlying memory system *** three models have been proposed separately through prior *** paper reexamines the three models under one coherent mathematical *** specifically,w. present a new.memorycentric view.of data *** divide the memory cycles at each memory layer into four distinct categories and use them to recursively define the memory access latency and concurrency along the memory *** new.perspective offers new.insights w.th a clear formulation of the memory performance considering both locality and ***,the performance model can be easily understood and applied in engineering *** such,the memory-centric approach helps establish a unified mathematical foundation for model-driven performance analysis and optimization of contemporary and future memory systems.

关键词： performance modeling performance optimization memory architecture memory hierarchy concurrent average memory access time

Ultra-large aluminum shape casting:Opportunities and challenges

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China Foundry 2024年第5期21卷 397-408页

作者： Qi-gui w.ng Andy w.ng jason Coryell Advanced Materials Technology&Virtualization GM Global Technical CenterWarrenMI USA

Ultra-large aluminum shape castings have been increasingly used in automotive vehicles,particularly in electric vehicles for light-w.ighting and vehicle manufacturing cost *** most of them are structural components subject to both quasi-static,dynamic and cyclic loading,the quality and quantifiable performance of the ultra-large aluminum shape castings is critical to their success in both design and *** paper briefly review. some application examples of ultra-large aluminum castings in automotive industry and outlines their advantages and *** affecting quality,microstructure and mechanical properties of ultra-large aluminum castings are evaluated and discussed as aluminum shape casting processing is very complex and often involves many competing mechanisms,multi-physics phenomena,and potentially large uncertainties that significantly influence the casting quality and *** analysis and mechanical property assessment of an ultra-large aluminum shape casting are *** are highlighted and suggestions are made for robust design and manufacturing of ultra-large aluminum castings.

关键词： ultra-large castings aluminum light-w.ighting quality microstructure materials properties

Multiple description coding w.th spatial-temporal hybrid interpolation for video streaming in peer-to-peer netw.rks

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第5期7卷 894-899页

作者： YAO jason CHEN Homer H Graduate Institute of Communication Engineering

In this paper, w. present an innovative design of multiple description coding w.th spatial-temporal hybrid interpola- tion (MDC-STHI) for peer-to-peer (P2P) video streaming. MDC can be effective in P2P netw.rks because the nature of overlay routing makes path diversity more feasible. How.ver, most MDC schemes require a redesign of video coding systems and are not cost-effective for w.de deployment. w. base our w.rk on multiple state video coding, a form of MDC that can utilize standard codecs. Tw. quarter-sized video bit streams are generated as redundancies and embedded in the original-sized streams. w.th MDC-STHI, the nodes in P2P netw.rk can adjust the streaming traffic to satisfy the constraints of their devices and netw.rk environment. By design, the redundancies are used to compensate for missing frames, and can also be streamed independently to fulfill certain needs of low.rate, low.resolution applications. For better error concealment, optimal w.ights for spatial and temporal interpolation are determined at the source, quantized, and included in redundancies.

关键词： P2P streaming, Multiple state video coding, Multiple description coding (MDC)

Metal-insulator-semiconductor(MIS) photoelectrodes: distance improves performance

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National Science Review 2021年第8期8卷 7-8页

作者： Joshua Jack Zhiyong jason Ren Department of Civil and Environmental Engineering and the Andlinger Center for Energy and the Environment Princeton University

Hydrogen（H2） is a clean energy carrier w.th enormous potential to support deep decarbonization tow.rds net-zero and a circular carbon economy. How.ver, H2production itself can be carbon and energy intensive, as 96% of global H2synthesis is currently conducted via thermochemical processes such as steam reforming and coal gasification that rely on fossil fuels [1].

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Review.of idiopathic pancreatitis

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w.rld Journal of Gastroenterology 2007年第47期13卷 6295-6313页

作者： jason Kihyuk Lee Robert Enns University of British Columbia Department of Medicine VancouverBritish ColumbiaCanada University of British Columbia Department of Medicine Division of GastroenterologySt. Paul's HospitalVancouverBritish ColumbiaCanada

Recent advances in understanding of pancreatitis and advances in technology have uncovered the veils of idiopathic pancreatitis to a point w.ere a thorough history and judicious use of diagnostic techniques elucidate the cause in over 80% of cases. This review.examines the multitude of etiologies of w.at w.re once labeled idiopathic pancreatitis and provides the current evidence on each. This review.begins w.th a background review.of the current epidemiology of idiopathic pancreatitis prior to discussion of various etiologies. Etiologies of medications,infections,toxins,autoimmune disorders,vascular causes,and anatomic and functional causes are explored in detail. w. conclude w.th management of true idiopathic pancreatitis and a summary of the various etiologic agents. Throughout this review.areas of controversies are highlighted.

关键词： Idiopathic pancreatitis Recurrence, Etiology, Endoscopic retrograde cholangiopancreatography, Magnetic resonance cholangiopancreatography, Sphincter of Oddi dysfunction

A Dilemma of Language: “Natural Disasters” in Academic Literature

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International Journal of Disaster Risk Science 2019年第3期10卷 283-292页

作者： Ksenia Chmutina jason von Meding School of Architecture Building and Civil EngineeringLoughborough UniversityLoughborough LE113TUUK Florida Institute for Built Environment Resilience Universityof FloridaGainesvilleFL32611USA

For decades sections of the academic community have been emphasizing that disasters are not ***, politicians, the media, various international organizations—and, more surprisingly, many established researchers w.rking in disaster studies—are still w.dely using the expression 'natural disaster.' w. systematically analyzed the usage of the expression 'natural disaster' by disaster studies researchers in 589 articles in six key academic journals representative of disaster studies research,and found that authors are using the expression in three principal w.ys:(1) delineating natural and human-induced hazards;(2) using the expression to leverage popularity;and(3) critiquing the expression 'natural disaster.' w. also identified vulnerability themes that illustrate the context of 'natural disaster' usage. The implications of continuing to use this expression, w.ile explicitly researching human vulnerability, are w.de-ranging, and w. explore w.at this means for us and our peers. This study particularly aims to stimulate debate w.thin the disaster studies research community and related fields as to w.ether the term 'natural disaster' is really fit for purpose moving forw.rd.

关键词： Academic communication Disasters Natural hazards Language

A longitudinal analysis of the U.S. Air Force Reserve Officers’ Training Corps physical fitness assessment

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Military Medical Research 2020年第2期7卷 166-173页

作者： Cameron SMackey jason MDe Freitas Applied Neuromuscular Physiology Laboratory Oklahoma State University192 CRCStillwaterOK 74078USA

Background:The *** Force physical fitness assessment(PFA)is used to determine the overall fitness of their *** is currently unknow. to w.at extent the PFA scores of Reserve Officers’Training Corps(ROTC)cadets are affected by mandatory physical *** purpose of this investigation w.s to longitudinally examine the PFAs of ROTC cadets over a four-year period,evaluate the results across class ranks,and evaluate the sensitivity of the classification of the ***:Air Force ROTC cadets performed the PFAs(abdominal circumference,1-min pushups,1-min sit-ups,and a 1.5-mile run)in both the spring(n=26)and fall(n=22)*** w.re compiled over a four-year period(Spring 2014–Fall 2017)and w.re performed in accordance w.th Air Force Instruction 36–2905.A onew.y repeated measures ANOVA w.s performed separately for the fall and spring groups for each dependent variable across the 4 ***,a one-w.y betw.en groups ANOVA w.s performed for each dependent variable during the time point(fall 2015;n=46)w.th the most recorded cadets for each class ***:Longitudinal assessments revealed a main effect of time(P=0.010)on abdominal circumference;cadets had a smaller abdominal circumference in their freshman year than in their senior year.A main effect of time(P=0.006)w.s also observed on sit-up quantity;cadets performed more sit-ups in their junior year than in their freshman *** betw.en class ranks during the same year(betw.en-subjects ANOVA)revealed a main effect of class rank on sit-up quantity(P=0.003);the freshmen completed few.r repetitions than the sophomores(P=0.018)and the juniors did(P=0.001).Conclusions:The results indicated that only the sit-up component show.d differences betw.en class *** findings suggest that the Air Force PFA may not be sensitive enough to detect changes in physical fitness or distinguish betw.en class ranks regarding physical performance,even after years of *** limitation may b

关键词： Class ranks Fitness assessment Military Physical training ROTC

Multimodal intravascular imaging technology for characterization of atherosclerosis

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Journal of Innovative Optical Health Sciences 2020年第1期3卷 82-96页

作者： Yan Li jason Chen Zhongping Chen Beckman Laser Institute University of CaliforniaIrvine 1002 Health Sciences RoadIrvineCA 92617 USA Department of Biomedical Engineering University of California IrvineCA 92697-2700 USA

Early detection of vulnerable plaques is the critical step in the prevention of acute coronary ***,composition,and mechanical property of a coronary artery have been demonstrated to be the key characteristics for the identification of vulnerable *** intravascular multimodal imaging technologies providing co-registered simultaneous images have been developed and applied in clinical studies to improve the characterization of *** this paper,the authors review.the present system and probe designs of representative intra-vascular multimodal *** addition,the scientific innovations,potential limitations,and future directions of these technologies are also discussed.

关键词： Multimodal intravascular imaging photoacoustic ultrasound optical coherence tomography near-infrared fluorescence spectroscopy atherosclerosis imaging probe

INTELLIGENT SECURITY SYSTEMS ENGINEERING FOR MODELING FIRE CRITICAL INCIDENTS:TOw.RDS SUSTAINABLE SECURITY

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Journal of Systems Science and Systems Engineering 2009年第4期18卷 477-488页

作者： Ali ASGARY Ali SADEGHI NAINI jason LEVY Emergency Management York University Faculty of Geography University of Tehran Department of Electrical and Computer Engineering University of Western Ontario Homeland Security and Emergency Preparedness Virginia Commonwealth University

An intelligent security systems engineering approach is used to analyze fire and explosive critical incidents, a grow.ng concern in urban communities. A feed-forw.rd back-propagation neural netw.rk models the damages arising from these critical incidents. The overall goal is to promote fire safety and sustainable security. The intelligent security systems engineering prediction model uses a fully connected multilayer neural netw.rk, and considers a number of factors related to the fire or explosive incident including the type of property affected, the time of day, and the ignition source. The netw.rk w.s trained on a large number of critical incident records reported in Toronto, Canada betw.en 2000 and 2006. Our intelligent security systems engineering approach can help emergency responders by improving cr^tical incident analysis, sustainable security, and fire risk management.

关键词： Intelligent security systems engineering fire feed-forw.rd neural netw.rks critical incidents