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Failure signature analysis of power-opens in DDR3 SDRAMs
Li, Tan,Lee, Hosung,Bak, Geunyong,Baeg, Sanghyeon Elsevier 2018 Microelectronics reliability Vol.88 No.-
<P><B>Abstract</B></P> <P>Open defects in power pins can only be diagnosed indirectly, and these diagnoses are a challenging task in failure analysis due to the failure signature's aliasing to other issues. Open defects cannot be detected by traditional DC-type test methods and can remain a potential risk in stressful device operation. In this work, error signatures in power open faults are experimentally probed to better understand electrical signatures induced by power-open. The power open faults are intentionally injected into a DDR3 SDRAM test platform. The power network inside the DDR3 SDRAM is experimentally found to be asymmetrical. Power-open defects in one power pin produce a range of power noise (0–65 mV), depending on the location of the power pin.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Power open faults are intentionally injected into customized DDR3 SDRAM test platform. </LI> <LI> Error signatures in power open faults are experimentally probed. </LI> <LI> The power network inside the DDR3 SDRAM is experimentally found to be asymmetrical. </LI> <LI> Power-open defects of one power ball increased power noise for a DDR3 component. </LI> </UL> </P>
Partly Random Multiple Weighting Matrices Selection for Orthogonal Random Beamforming
Li Tan,Zhongcai Li,Chao Xu,Desheng Wang 한국통신학회 2016 Journal of communications and networks Vol.18 No.6
In the multi-user multiple-input multiple-output(MIMO) system, orthogonal random beamforming (ORBF)scheme is proposed to serve multiple users simultaneously in orderto achieve the multi-user diversity gain. The opportunistic spacedivisionmultiple access system (OSDMA-S) scheme performs multipleweighting matrices during the training phase and choosesthe best weighting matrix to be used to broadcast data during thetransmitting phase. The OSDMA-S scheme works better than theoriginal ORBF by decreasing the inter-user interference duringthe transmitting phase. To save more time in the training phase,a partly random multiple weighting matrices selection scheme isproposed in this paper. In our proposed scheme, the Base Stationdoes not need to use several unitary matrices to broadcast pilotsymbol. Actually, only one broadcasting operation is needed. Each subscriber generates several virtual equivalent channels witha set of pre-saved unitary matrices and the channel status informationgained from the broadcasting operation. The signal-tointerferenceand noise ratio (SINR) of each beam in each virtualequivalent channel is calculated and fed back to the base stationfor the weighting matrix selection and multi-user scheduling. Accordingto the theoretical analysis, the proposed scheme relativelyexpands the transmitting phase and reduces the interactive complexitybetween the Base Station and subscribers. The asymptoticanalysis and the simulation results show that the proposed schemeimproves the throughput performance of the multi-user MIMOsystem.
Higher-order assumed stress quadrilateral element for the Mindlin plate bending problem
Li, Tan,Qi, Zhaohui,Ma, Xu,Chen, Wanji Techno-Press 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.54 No.3
In this paper an 8-node quadrilateral assumed stress hybrid Mindlin plate element with $39{\beta}$ is presented. The formulation is based on complementary energy principle. The proposed element is free of shear locking and is capable of passing all the patch tests, especially the non-zero constant shear enhanced patch test. To accomplish this purpose, special attention is devoted to selecting boundary displacement interpolation and stress approximation in domain. The arbitrary order Timoshenko beam function is successfully used to derive the boundary displacement interpolation. According to the equilibrium equations, an appropriate stress approximation is rationally derived. Particularly, in order to improve element's accuracy, the assumed stress field is derived by employing $39{\beta}$ rather than conventional $21{\beta}$. The resulting element can be adopted to analyze both moderately thick and thin plates, and the convergence for the very thin case can be ensured theoretically. Excellent element performance is demonstrated by a wide of experimental evaluations.
Litan Kumar Saha,Nobuyuki Oshima 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.5
"A serpentine flow channel is one of the most common and practical channel layouts for Polymer electrolyte fuel cells (PEFCs) since it ensures the removal of water produced in the cell with an acceptable parasitic load. The operating parameters such as temperature, pressure and flow distribution in the flow channel and gas diffusion layer (GDL) has a great influence on the performance of PEFCs. It is desired to have an optimum pressure drop because a certain pressure drop helps to remove excess liquid water from the fuel cell, too much of pressure drop would increase parasitic power needed for the pumping air through the fuel cell. In order to accurately estimate the pressure drop precise calculation of mass conservation is necessary. Flow crossover in the serpentine channel and GDL of PEFC has been investigated by using a transient, non-isothermal and three-dimensional numerical model. Considerable amount of cross flow through GDL is found and its influence on the pressure variation in the channel is identified. The results obtained by numerical simulation are also compared with the experimental as well as theoretical solution."
Central limit theorem for weighted local time of L2 modulus of fractional Brownian motion
Chao Chen,Litan Yan,Cheng Ju 한국통계학회 2012 Journal of the Korean Statistical Society Vol.41 No.4
In this paper, we mainly prove a central limit theorem for weighted local time of L2-modulus of fractional Brownian motion with Hurst parameter H ∈ (12, 1). Similar to Hu and Nualart (2009), based on techniques of stochastic analysis, the main ingredients of the proof are analogous to the asymptotic version of Knight’s theorem and the fractional Clark–Ocone formula for the L2-modulus of the weighted local time increments.
Remarks on asymptotic behavior of weighted quadratic variation of subfractional Brownian motion
Junfeng Liu,Litan Yan 한국통계학회 2012 Journal of the Korean Statistical Society Vol.41 No.2
The present note is devoted to prove, by means of Malliavin calculus, the convergence in L2 of some properly renormalized weighted quadratic variation of sub-fractional Brownian motion SH with parameter H < 1/4.
On the convergence to the multiple subfractional Wiener–Itô integral
Guangjun Shen,Litan Yan,Chao Chen 한국통계학회 2012 Journal of the Korean Statistical Society Vol.41 No.4
In this paper, we construct a family of continuous stochastic processes that converges in law to the multiple Wiener–Itô integrals with respect to the subfractional Brownian motion withH > 12 for the integrand f in a rather general class of functions.Wemainly use Donsker and Stroock approximations and the techniques of the multiple Wiener–Itô integral with respect to the Wiener process.
Nonlocal Cauchy problem for some stochastic integro-differential equations in Hilbert spaces
Jing Cui,Litan Yan,Xiaotai Wua 한국통계학회 2012 Journal of the Korean Statistical Society Vol.41 No.3
In this paper, we study the existence results of mild solutions for a class of stochastic integro-differential equations with nonlocal conditions and stochastic impulsive integrodifferential equations with nonlocal conditions in Hilbert spaces. Sufficient conditions for the existence of mild solutions are derived by means of Leray–Schauder nonlinear alternative. An example is provided to illustrate the theory.
Remarks on an integral functional driven by sub-fractional Brownian motion
Guangjun Shen,Litan Yan 한국통계학회 2011 Journal of the Korean Statistical Society Vol.40 No.3
This paper studies the functionals A1(t, x) = ∫ ^t _01_[0,∞)(x − S^H _s )ds,A_2(t, x) = ∫^ t _01_[0,∞)(x − S^H _s )s^(2H−1)ds,where (S^H _t )0≤t≤T is a one-dimension sub-fractional Brownian motion with index H ∈ (0, 1). It shows that there exists a constant pH ∈ (1, 2) such that p-variation of the process A_j(t, S^H_t ) − ^t _0 L_j(s, ^S_H s )dS^H _s (j = 1, 2) is equal to 0 if p > pH, where L_j, j = 1, 2, are the local time and weighted local time of S^H, respectively. This extends the classical results for Brownian motion.
Nonlocal Cauchy problem for some stochastic integro-differential equations in Hilbert spaces
Cui, Jing,Yan, Litan,Wu, Xiaotai 한국통계학회 2012 Journal of the Korean Statistical Society Vol.41 No.3
In this paper, we study the existence results of mild solutions for a class of stochastic integro-differential equations with nonlocal conditions and stochastic impulsive integro-differential equations with nonlocal conditions in Hilbert spaces. Sufficient conditions for the existence of mild solutions are derived by means of Leray-Schauder nonlinear alternative. An example is provided to illustrate the theory.