全状态移位型计数器

针对移位型计数器存在状态利用不足这一问题提出了全状态移位计数器从四位扭环移位计数器状态图中两个有效循环出发分析了四位全状态移位计数器的设计通过讨论拆环链合形成具有移位转换规律的完全状态图得到四位全状态移位计数器反馈函数卡诺图以及反馈函数表达式并给出了任意位全状态移位计数器反馈函数一般表达式

关于状态差计数法输入概率的优化

建立在逻辑电路内部自测试的基础上,提出了一种新的优化伪随机序列输入概率的方法.首先找到了最难测故障在电路中的分布,建立了对应于最难测故障的电路模型,然后根据状态差计数法对这些电路模型的输出信号进行压缩,通过分析压缩后的数据,得出最难测故障的故障检测率.最后利用电路的原始输入概率与故障检测率之间的关系,提出了一种优化输入概率的算法,求出了测试数字电路最佳的原始输入概率.

状态差计数法及其置信度的估计

本文提出了一种新的压缩电路输出信息的方法－状态差计数法，估计了该法的测试置信度，分析了置信度标准的一些性质，用有限状态自动机建立了测试过程的模型，用马尔科夫链描述了自动机状态间的相互转换，求出了测试置信度与测试序列长度间的相互关系，实验表明，分析数据与模拟结果是吻合的．

关于转移计数过程转移频度公式的一点注记

举例说明了仅有规则性不能推出一致收敛性 ,并给出了一些一致收敛性的充分条件。

并网风电转换系统中特定消谐PWM技术和控制方法

研究和设计出一种风电转换系统接口装置新的控制方法,它大大提高了对电网的供电质量,可以主动消除谐波,改善功率因数,省去滤波设备;进一步阐述了该装置采用特定消谐PWM技术的原理,探讨了新颖的控制方式;最后,给出了计算机实现的状态计数法。

开入量软件滤波的实现

结合实例分析了开入量软件滤波的原理及二种基本实现方法,并对二种方法的性能作了对比。

声音识别技术在门禁控制系统中的应用

传统的钥匙和锁已经不能满足目前智能建筑对门禁系统安全性和可靠性的要求,生物识别技术作为身份认证的一种技术在各种场合应用越来越广泛,而声纹识别又特别适用于门禁系统。采用语音压缩与技术对声纹进行采样,结合单片微型计算机,利用合理的算法对声纹进行识别,可以有效提高门禁系统的安全性和可靠性。

SCTree:一种互异情节模式挖掘算法

现有的事件序列情节模式挖掘算法多是基于滑动窗口和非重叠出现的。目前没有有效算法挖掘基于互异出现的互异情节模式。为此,提出带状态计数的前缀树结构(SCTree)来生成互异情节模式候选集,进行互异计数和裁剪。为减少数据库扫描次数,提出SCTree的主动扩展技术。实验表明了算法的有效性和高效性。

基于单片机和增量式光电编码器脉冲检测电路的设计

通过脉冲计数状态电路设计和计数状态的识别,给出了增量式光电编码器脉冲计数的新方法,有效地防止了误码计数,提高了检测系统的抗干扰能力。

ARCHITECTURE OF DYNAMIC DATA DRIVEN SIMULATION FOR WILDFIRE AND ITS REALIZATION

Dynamic data driven simulation （DDDS） is proposed to improve the model by incorporaing real data from the practical systems into the model. Instead of giving a static input, multiple possible sets of inputs are fed into the model. And the computational errors are corrected using statistical approaches. It involves a variety of aspects, including the uncertainty modeling, the measurement evaluation, the system model and the measurement model coupling ,the computation complexity, and the performance issue. Authors intend to set up the architecture of DDDS for wildfire spread model, DEVS-FIRE, based on the discrete event speeification （DEVS） formalism. The experimental results show that the framework can track the dynamically changing fire front based on fire sen- sor data, thus, it provides more aecurate predictions.

The shape character and development stage of nebkha

Based on statistical analysis on morphological data of nebkhas surveyed in the Hotan River Basin,Xinjiang, the changing regularity and characters of nebkhas’ morphology in different development stageshave been discussed. Results indicate that there exist better correlation among length, width and altitudeof all kinds of nebkhas, but there are certain various shape characters in different nebkhas and the sametype of nebkhas in differential development stages. On account of analysis on mathematical imitation ofnebkhas’ shape characters, regional ecological environmental and aeolian characters, the development ofthe nebkha can be divided into a growing stage, a stabilizing stage and a declining stage.

Reliability Analysis Based on a Direct Ship Hull Strength Assessment

A method of reliability analysis based on a direct strength calculation employing the von Mises stress failure criterion is presented here. The short term strain distributions of ship hull structural components are identified through the statistical analysis of the wave-induced strain history and the long term distributions by the weighted summation of the short term strain distributions. The wave-induced long term strain distribution is combined with the still water strain. The extreme strain distribution of the response strain is obtained by statistical analysis of the combined strains. The limit state function of the reliability analysis is based on the von Mises stress failure criterion, including the related uncertainties due to the quality of the material and model uncertainty. The reliability index is calculated using FORM and sensitivity analysis of each variable that has effects on the reliability is also discussed.

A novel robust approach for SLAM of mobile robot

The task of simultaneous localization and mapping （SLAM） is to build environmental map and locate the position of mobile robot at the same time. FastSLAM 2.0 is one of powerful techniques to solve the SLAM problem. However, there are two obvious limitations in FastSLAM 2.0, one is the linear approximations of nonlinear functions which would cause the filter inconsistent and the other is the ＂particle depletion＂ phenomenon. A kind of PSO ＆ Hjj-based FastSLAM 2.0 algorithm is proposed. For maintaining the estimation accuracy, H~ filter is used instead of EKF for overcoming the inaccuracy caused by the linear approximations of nonlinear functions. The unreasonable proposal distribution of particle greatly influences the pose state estimation of robot. A new sampling strategy based on PSO （particle swarm optimization） is presented to solve the ＂particle depletion＂ phenomenon and improve the accuracy of pose state estimation. The proposed approach overcomes the obvious drawbacks of standard FastSLAM 2.0 algorithm and enhances the robustness and efficiency in the parts of consistency of filter and accuracy of state estimation in SLAM. Simulation results demonstrate the superiority of the proposed approach.

State Vectors—A New Method for Seismicity Analysis

The concept of state vector stems from statistical physics, where it is usually used to describe the evolution of a continuum field in its way of coarse-graining. In this paper, the state vector is employed to depict the evolution of seismicity quantitatively, and some interesting results are presented. The authors investigated some famous earthquake cases (e.g., the Haicheng earthquake, the Tangshan earthquake, the west Kunlun Mountains earthquake, etc.) and found that the state vectors evidently change prior to the occurrence of large earthquakes. Thus it is believed that the state vector can be used as a kind of precursor to predict large earthquakes.

基于74LS164交通信号控制系统逻辑电路的设计

主控制器是根据74LS164十四进制扭环形计数器状态循环转换原理而设计,是整个电路的核心,用于定时控制两个方向红、黄、绿信号灯的亮与灭及持续时间并将持续时间倒计时过程在LED七段数码管上同步显示出来。

A Statistical Mechanical Equation of State for Fluid UF4 and ThF4

Uranium tetrafluoride, UF4, and thorium tetrafluoride, ThF4, can be used as fuels in molten salt reactors. For the molten salt reactor design and safety analysis, it is essential to know the thermodynamic properties of the UF4 and ThF4 materials. However, the experimental data for UF4 and ThF4 P-V-T are scarce in literature. Under this circumstance prediction of the thermodynamic properties can be supported by theoretical calculations to remedy missing experimental data. Within this paper the Song, Mason and lhm＇s equation of state with modification of Tao and Mason, originally derived for spherical and molecular fluids, is applied for fluid UF4 and ThF4 based on the available experimental data. The equation of state is based on statistical mechanical perturbation theory with the perturbation scheme of Weeks, Chandler, and Andresen. The prediction of constants applied in the equation of state is based on the work of Boushehri et al. using data for heat of vaporization and liquid density at the triple point. The calculation of the heat of vaporization applies the ＂sigma＂ method reported by Darken et al. with the vapour pressure data and heat capacities of liquid and vapour of UF4 and ThF4. Finally an extra correction term for the vapour pressure is introduced into the new equation of state. The results show that this equation of state agrees reasonably well with the available experimental data. It can be expected that this equation of state can be applied also for conditions where experimental data are currently missing.

Long Range Correlations in Chemical Oscillations

The purpose of thepresent study is to determine whether a long range correlation is present in BZ （Belousov-Zhabotinskii） reaction and how this correlation varies with the change in concentration of the solution. To explore the dynamics of the system with change in concentration, phase space plot and power spectrum are studied. Hurst exponent is estimated using log log plot and R/S technique. We discuss the results which uncover how the system changes from an excitable steady stateto a limit cycle,

针灸联合克罗米芬对卵巢储备功能下降患者窦卵泡计数血清学指标及中医证候积分的影响

目的 探讨针灸联合克罗米芬治疗卵巢储备功能下降患者的临床效果。方法 选取2021年1月—2021年12月龙港市人民医院与温州市中医院泰顺分院收治的卵巢储备功能下降且辨证为肾阳虚型患者共60例,依照治疗方法的不同,分为对照组与观察组,每组各30例。对照组患者接受克罗米芬治疗,观察组患者在此基础上加入针灸治疗。比较两组患者的卵巢储备功能、性激素水平、中医证候积分及临床有效率。结果 对照组年龄23~38岁,平均年龄(28.50±4.22)岁;观察组年龄24~37岁,平均年龄(28.73±4.31)岁。两组患者的一般资料比较差异无统计学意义(P>0.05)。治疗前:两组患者的卵巢储备功能相关指标及雌激素水平和中医证候积分比较差异无统计学意义(P>0.05);治疗后,两组患者的抗苗勒氏管激素(AMH)、黄体生成素(LH)及卵泡刺激素(FSH)水平下降,且观察组低于对照组(AMH:2.13±0.40 ng/ml vs. 2.71±0.59 ng/ml,t=4.457,P=0.009;LH:4.25±1.01 mIU/ml vs. 4.82±1.09 mIU/ml,t=2.101,P=0.040;FSH:10.02±2.32 mIU/ml vs. 12.53±2.63 mIU/ml,t=3.920,P<0.001);窦卵泡计数(AFC)、抑制素B(InhB)、雌二醇(E2)水平增加,且观察组明显高于对照组(AFC:8.93±2.41 vs. 7.67±1.75,t=2.101,P=0.041;InhB:39.27±5.89 pg/ml vs. 33.62±5.07 pg/ml,t=3.982,P<0.001;E2:53.09±13.52 mIU/ml vs. 45.93±12.56 mIU/ml,t=2.125,P=0.038),差异均有统计学意义(均P<0.05)。治疗后,两组患者中医证候积分明显下降,且观察组低于对照组(12.21±3.01分vs. 15.56±3.25分,t=4.142,P<0.05),同时治疗后观察组患者临床有效率为93.33%,明显高于对照组73.33%的临床有效率,差异均有统计学意义(χ~2=9.381,均P<0.05)。结论 针灸联合克罗米芬治疗可有效改善卵巢储备功能下降患者的激素水平,减轻临床症状并提高临床有效率,提升卵巢储备功能。

Effective condition numbers and small sample statistical condition estimation for the generalized Sylvester equation

Abstract In this paper, we investigate the effective condition numbers for the generalized Sylvester equation （AX - YB, DX - YE） = （C,F）, where A,D ∈ Rm×m B,E ∈ Rn×n and C,F ∈ Rm×n. We apply the small sample statistical method for the fast condition estimation of the generalized Sylvester equation, which requires （9（m2n ＋ mn2） flops, comparing with （-O（m3 ＋ n3） flops for the generalized Schur and generalized Hessenberg- Schur methods for solving the generalized Sylvester equation. Numerical examples illustrate the sharpness of our perturbation bounds.

Efficient estimation for additive hazards regression with bivariate current status data

This paper discusses efficient estimation for the additive hazards regression model when only bivariate current status data are available. Current status data occur in many fields including demographical studies and tumorigenicity experiments （Keiding, 1991; Sun, 2006） and several approaches have been proposed for the additive hazards model with univariate current status data （Linet M., 1998; Martinussen and Scheike, 2002）. For bivariate data, in addition to facing the same problems as those with univariate data, one needs to deal with the association or correlation between two related failure time variables of interest. For this, we employ the copula model and an efficient estimation procedure is developed for inference. Simulation studies are performed to evaluate the proposed estimates and suggest that the approach works well in practical situations. An illustrative example is provided.