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Architecture Level Thermal Modeling for Multi-Core Systems using Subspace System Method

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Architecture Level Thermal Modeling for Multi-Core Systems u...

Recent Advance in Non-Krylov Subspace Model Order Reduction of Interconnect Circuits

2009 IEEE 8th International Conference on ASIC(ASICON 2009)

作者： Thom Jefferson A.Eguia sheldon x.-d.tan Eduardo H.Pacheco Murli Tirumala department of Electrical En-gineering University of California RiversideCA 92521USA. Intel Corporation 2200 Mission Col-lege BlvdSanta ClaraCA 95052

This paper proposes a new architecture-level thermal modeling method to address the emerging thermal related analysis and optimization problem for high-performance multi-core microprocessor *** new approach,called Thermsid,builds the thermal behavioral models from the measured or simulated thermal and power information at the architecture *** builds the thermal models by first generating a Hankel matrix.of Markov parameters,from which state matrices are obtained through minimum square *** to ex.sting behavioral thermal modeling algorithms,the proposed method is much more general as it does not require step temperature responses,leading to greater flex.bility during the modeling *** results on a real quad-core microprocessor show that Thermsid provides accurate thermal behavioral models comparable ex.sting approaches.

关键词： Thermal analysis architecture thermal modeling multicore processor

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Tsinghua Science and Technology 2010年第2期15卷 151-168页

作者： sheldon x.-d. tan department of Electrical Engineering University of California

Model order reduction of interconnect circuits is an important technique to reduce the circuit complex.ty and improve the efficiency of post-layout verification process in the nanometer VLSI design. Ex.sting works using the Krylov subspace method are very efficient, but the resulting models are less compact and lack global accuracy. Also, ex.sting methods cannot handle interconnect circuits with large input and output ports. Recent advances in reduction techniques using non-Krylov subspace techniques such as truncated balanced realization （TBR） hold some promise to solve these problems. In this paper, we first review the classic TBR-based reduction methods and then present the recent developments in fast TBR-based reduction and techniques such as PMTBR, SBPOR, and ETBR methods. These newly proposed methods try to avoid the ex.ensive computing steps in traditional TBR methods at some cost to accuracy to boost efficiency and scalability, which is critical to reduce large interconnect parasitics modeled as RLCK circuits. The ETBR method can also reduce circuits with massive ports by considering the input signals. We show the pros and cons of each method and compare them on a set of large interconnect circuits, and finally point to some new research directions for this area.

关键词： model order reduction balanced realization interconnect

Efficient statistical analysis method of power/ground (P/G) network

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Progress in Natural Science:Materials International 2008年第2期18卷 189-196页

作者： sheldon x.d.tan CA 92521 department of Electrical Engineering University of California at Riverside USA

In this paper,we propose an incremental statistical analysis method with complex.ty reduction as a pre-process for on-chip power/ ground (P/G) networks. The new method ex.loits locality of P/G network analyses and aims at P/G networks with a large number of strongly connected subcircuits (called strong connects) such as trees and chains. The method consists of three steps. First it compresses P/ G circuits by removing strong connects. As a result,current variations (CVs) of nodes in strong connects are transferred to some remain-ing nodes. Then based on the locality of power grid voltage responses to its current inputs,it effciently calculates the correlative resistor (CR) matrix.in a local way to directly compute the voltage variations by using small parts of the remaining circuit. Last it statistically recovers voltage variations of the suppressed nodes inside strong connects. This new method for statistically compressing and ex.anding strong connects in terms of current or voltage variations in a closed form is very effcient owning to its property of incremental analysis. Ex.erimental results demonstrate that the method can effciently compute low-bounds of voltage variations for P/G networks and it has two or three orders of magnitudes speedup over the traditional Monte-Carlo-based simulation method,with only 2.0% accuracy loss.

关键词： P/G network Statistical analysis Incremental analysis Equivalent circuit method

Localized relax.tion theory of circuits and its applications in electro-thermal analyses

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Science China(Information Sciences) 2012年第4期55卷 938-950页

作者： GORdON Joseph A. tan sheldon x.-d. department of Electrical Engineering University of CaliforniaRiversideCA 92521USA

In the high-performance IC design with increasing design complex.ty,it is a very important design content to efficiently analyze IC ***,the electro-thermal (ET) analyses including power/ground (P/G) analysis and thermal analysis are hot topics in today's IC *** ET analysis equation has a sparse,positive definite and strictly diagonally dominant coefficient-matrix.we prove that the ET analysis has the advantage of *** to this advantage,localized relax.tion method is formally proposed,which has the same accuracy as the global relax.tion done with the constraint of the same truncation error *** on the localized relax.tion theory,an efficient and practical localized successive over-relax.tion algorithm (LSOR2) is introduced and applied to solve the following three ET analysis problems.(1) Single-node statistical voltage analysis for over-IR-drop nodes in P/G networks;(2) single-node statistical temperature analysis for hot spots in 3d thermal analysis;(3) fast single open-defect analysis for P/G networks.A large amount of ex.erimental data demonstrates that compared with the global successive over-relax.tion (SOR) algorithm,LSOR2 can speed up 1-2 orders of magnitudes with the same accuracy in ET analyses.

关键词： integrated circuit electro-thermal analysis SOR algorithm power/ground network

基于部分随机行走的电源线/地线(P/G)网络快速求解方法

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计算机辅助设计与图形学学报 2004年第11期16卷 1535-1541页

作者：骆祖莹王国璞蔡懿慈洪先龙 sheldon x.-d.tan 清华大学计算机科学与技术系 department of Electrical Engineering University of California Riverside CA 92521

介绍一种基于随机行走方法与松弛迭代 (SOR)算法相结合的快速电源网络求解方法 ,它先将P/G网分为若干块 ,然后用简化的随机行走方法求取电路块边界结点的电压 ,最后采用松弛迭代算法求出电路块内部结点的电压同时还给出了一种电路块从... 详细信息

介绍一种基于随机行走方法与松弛迭代 (SOR)算法相结合的快速电源网络求解方法 ,它先将P/G网分为若干块 ,然后用简化的随机行走方法求取电路块边界结点的电压 ,最后采用松弛迭代算法求出电路块内部结点的电压同时还给出了一种电路块从对角顶点向中央求解的策略 ,并将此方法推广到采用RLC瞬态网络的求解大量的实验数据表明 ,受限于P/G网供电PAd的数目较少这一现实 ,随机行走方法的效率比较低 ,在此情形下 ,该方法比随机行走方法快 2

关键词：随机行走电源线/地线网格松弛迭代算法(SOR) 分层策略

Time-domain analysis methodology for large-scale RLC circuits and its applications

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Science in China(Series F) 2006年第5期49卷 665-680页

作者： LUO Zuying CAI Yici sheldon x.-d.tan HONG x.anlong WANG x.aoyi PAN Zhu FU Jingjing department of Computer Science and Technology Tsinghua University Beijing 100084 China College of Information Science and Technology Beijing Normal University Beijing 100875 China department of Electrical Engineering University of California at Riverside Riverside CA92521 USA

With soaring work frequency and decreasing feature sizes, VLSI circuits with RLC parasitic components are more like analog circuits and should be carefully analyzed in physical design. However, the number of ex.racted RLC components is typically too large to be analyzed efficiently by using present analog circuit simulators like SPICE. In order to speedup the simulations without error penalty, this paper proposes a novel methodology to compress the time-descritized circuits resulted from numerical integration approx.mation at every time step. The main contribution of the methodology is the efficient structure-level compression of dC circuits containing many current sources, which is an important complement to present circuit analysis theory. The methodology consists of the following parts： 1） An approach is proposed to delete all intermediate nodes of RL branches. 2） An efficient approach is proposed to compress and back-solve parallel and serial branches so that it is error-free and of linear complex.ty to analyze circuits of tree topology. 3） The Y to πtransformation method is used to error-free reduce and back-solve the intermediate nodes of ladder circuits with the linear complex.ty. Thus, the whole simulation method is very accurate and of linear complex.ty to analyze circuits of chain topology. Based on the methodology, we propose several novel algorithms for efficiently solving RLC-model transient power/ground （P/G） networks. Among them, EQU-AdI algorithm of linear-complex.ty is proposed to solve RLC P/G networks with mesh-tree or mesh-chain topologies. Ex.erimental results show that the proposed method is at least two orders of magnitude faster than SPICE while it can scale linearly in both time- and memory-complex.ty to solve very large P/G networks.

关键词： RLC circuits analog circuit analysis time-domain analysis PIG networks algorithm complex.ty

Apolipoprotein E elicits targetdirected miRNA degradation to maintain neuronal integrity

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Neural Regeneration Research 2025年第9期20卷 2577-2578页

作者： Jiazi tan Chin-Tong Ong Temasek Life Sciences Laboratory National University of SingaporeSingapore department of Biological Sciences National University of SingaporeSingapore

Apolipoprotein E has diverse functions in neurons:Apolipoprotein E(ApoE)is a glycoprotein that primarily regulates lipid metabolism and transport in the central nervous *** are three predominant human ApoE protein isoforms with cysteine and arginine substitutions at amino acid positions 112 and 158 that impact their lipidation and related functions(Flowers and Rebeck,2020).ApoE2 is characterized by Cys112 and Cys158,ApoE3 by Cys112 and Arg158,whereas ApoE4 contains Arg112 and Arg158.

关键词： metabolism glycoprotein maintain

Unveiling the mechanism of non-conventional superconductivity through material genome engineering

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Frontiers of physics 2022年第3期17卷 7-8页

作者： x.-d.x.ang department of materials science and engineering and department of physicssouthern university of science and technologyshenzhen 518055china

Studying the complex.ty of the electronic phase diagram is at the heart of understanding strongly correlated system in general,with high Tc superconductors as the most known *** temperature superconductivity has a wide range of application potentials in power transmission,nuclear magnetic resonance,magnetic levitation transportation,aerospace,information and communication technologies,*** its mechanism remains a long-standing challenge,due to its complex.material structures and interlays among different phases such as charge density wave,antiferromagnetic and superconducting *** a result,this has greatly hindered its further development.

关键词： mechanism superconductivity magnetic

Static and dynamic snap-through behaviour of an elastic spherical shell

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Acta Mechanica Sinica 2012年第3期28卷 695-710页

作者： d. Karagiozova x.-W. Zhang T.-x. Yu department of Mechanical Engineering Hong Kong University of Science and TechnologyClear Water Bay Kowloon Hong Kong China Institute of Mechanics Bulgarian Academy of SciencesAcad. G. Bonchev Street Block 4Sofia 1113 Bulgaria School of Mechantronical Engineering Beijing Institute of Technology100081 Beijing China

The deformation and snap-through behaviour of a thin-walled elastic spherical shell statically compressed on a flat surface or impacted against a fiat surface are studied the- oretically and numerically in order to estimate the influence of the dynamic effects on the response. A table tennis ball is considered as an ex.mple of a thin-walled elastic shell. It is shown that the increase of the impact velocity leads to a variation of the deformed shape thus resulting in larger de- formation energy. The increase of the contact force is caused by both the increased contribution of the inertia forces and contribution of the increased deformation energy. The contact force resulted from deformation/inertia of the ball and the shape of the deformed region are calcu- lated by the proposed theoretical models and compared with the results from both the finite element analysis and some previously obtained ex.erimental data. Good agreement is demonstrated.

关键词： Elastic spherical shell Snap-through buckling.Static dynamic