Parallel Implementation of the Non-Overlapping Template Matching Test Using CUDA

NIST(National Institute of Standards and Technology) statistical test recognized as the most authoritative is widely used in verifying the randomness of binary sequences. The Non-overlapping Template Matching Test as the 7 th test of the NIST Test Suit is remarkably time consuming and the slow performance is one of the major hurdles in the testing process. In this paper, we present an efficient bit-parallel matching algorithm and segmented scan-based strategy for execution on Graphics Processing Unit(GPU) using NVIDIA Compute Unified Device Architecture(CUDA). Experimental results show the significant performance improvement of the parallelized Non-overlapping Template Matching Test, the running speed is 483 times faster than the original NIST implementation without attenuating the test result accuracy.

Inertia Matching During Dynamic Simulation of Vehicle Drive System on Test Bench

Framework and basic parameters of a test bench for motor drive system of electric vehicle (EV) are illuminated. Two kinds of electric drive models, one was for the electric vehicle drived on real road, the other was for that on test bench, are put forward. Then, dynamic analysis of these models is made in detail. Inertia matching method of the test bench is researched and some useful formulas and graphs are brought forward. The experiment of an electric bus is introduced in order to explain the usage of this inertia matching method.

Match loop测试方法研究

在数字芯片测试中,当遇到芯片的数据输出时间点不确定的情况时,测试仪无法编写严格时序的测试向量,而采用match loop向量编程的测试方法可有效的解决以上问题。本文分析了两种基本match loop方法,针对一款基带芯片,采用match loop测试方法进行了详细的分析,最终完成测试。

Matched Filter Based Spectrum Sensing When Primary User Has Multiple Power Levels

In this paper,we investigate the matched filter based spectrum sensing in a more reasonable cognitive radio(CR) scenario when the primary user(PU) has more than one transmit power levels,as regulated in most standards,i.e.,IEEE 802.11 Series,GSM,LTE,LTE-A,etc.This new multiple primary transmit power(MPTP) scenario is specialized by two different targets:detecting the presence of PU and identifying the power level.Compared to the traditional binary sensing where only the presence of PU is checked,SU may attain more information about the primary network(making CR more "intelligent") and design the subsequent optimization strategy.The key technology is the multiple hypothesis testing as opposed to the traditional binary hypothesis testing.We discuss two situations under whether the channel phase is known or not,and we derive the closed form solutions for decision regions and several performance metrics,from which some interesting phenomenons are observed and the related discussions are presented.Numerical examples are provided to corroborate the proposed studies.

Guided Waves Mode Discrimination in Pipes NDT Based on the Matching Pursuit Method

Ultrasonic guided wave have the multi-modes and dispersive characteristics, and its modes are easy to be converted at boundary or when running into defects in pipes, which makes the discrimination of different guided waves modes of the reflection signals in pipes NDT very hard. In this work, firstly, the experiments are carried out to test two kinds of stainless steel pipes by applying guided waves NDT, one is integrated pipe and another is non-integrated pipe with a small hole defect, and the detected guided waves echo signals are respectively obtained. Secondly, the measured signals are processed by matching pursuit method and the Chirplet matching atom parameters are calculated. By calculating the time-frequency distributions spectrum of detected guided waves echo signals, torsional, flexural and longitudinal guided waves modes are identified from the intact pipe, and the two wave-packets with torsional and flexural guided waves modes are also identified from the pipe with hole defect. The results showed that the matching pursuit method has a tremendous advantage to identify different guided waves modes in pipes nondestructive testing.

Innovation and Validation of Neuropsychopharmacological Testing Methods for the Assessment of Memory, Attention and Cognition in Human Participants

To meet the challenges of time searching for the new method for neuropsychopharmacology is still an ongoing process. In this experiment, we proposed and validated three neuropsychopharmacological testing methods, which are Matching Capacity (MC), Dissimilarity Identification (DI) and Sense Making (SM) tests for the estimation of memory, attention and cognition respectively in healthy aged human participants. The purpose of this experiment was to generate more effective testing methods for the determination of memory, attention and cognition in human. To endorse proposed methods a randomized double blind placebo controlled clinical trial was conducted among healthy aged human participants between the period of December 2015 and February 2016. The experiment was conducted at Gazipur Sadar, Gazipur-1703, Dhaka, Bangladesh and the experiment center was the Department of Pharmacy, Southeast University, Dhaka-1213, Bangladesh. In this experiment, 60 healthy male participants between the age of 42 to 50 years were selected and divided into 4 groups with 15 participants in each by simple randomization process. Ginkgo biloba standardized extract’s capsule (Giloba?) and Bacopa monnieri standardized extract’s syrup (Monera?) were used as standard. Psyllium seed husk (i.e., seed of the Plantago ovata) was incorporated in the hard gelatin capsule shell (size 0) to prepare capsule and used as a placebo control of the capsule (PCC). Excipients of oral liquid preparation of vitamin were used to prepare syrup and used as a placebo control of the syrup (PCS). The treatment procedure for group 1 was Ginkgo biloba standardized extract’s capsule (120 mg/capsule), 3 times daily for 21 days;group 2 was treated with Bacopa monnieri standardized extract’s syrup (1.21 g/5 ml), 2 teaspoonfuls, 3 times daily for 21 days. Psyllium seed husk’s capsule and excipients of oral liquid vitamin’s syrup were used as placebo control (PC) for group 3 and group 4 and administered in the similar manner of group 1 and group 2, respectively. Administration of Ginkgo biloba (GB) and Bacopa monnieri (BM) standardized extracts for successive days significantly increased the memory, attention and cognition of the participants with respect to PC groups. In the MC test, treatment with GB extract markedly (P < 0.05) increased the memory of the participants on 21st day with respect to PCC group. On the other hand administration of BM extract remarkably (P < 0.01) increased the memory of the participants on 14th day in comparison with PCS group. For DI test, administration of GB extract noticeably (P < 0.01, P < 0.05) increased the attention of the participants on 14th and 21st day as compared to that of PCC group. Conversely BM extract significantly (P < 0.05, P < 0.01) increased the attention of the participants on 7th, 14th and 21st day with regard to PCS group. In the SM test, administration of GB extract noticeably (P < 0.05) increased the cognition of the participants on 7th and 21st day in comparison with PCC group. BM extract administration considerably (P < 0.01) increased cognition of the participants on 14th and 21st day related to the PCS groups. The experiment demonstrates that MC, DI and SM tests clearly exposed the memory, attention and cognition enhancing activity of the GB and BM standardized extracts in healthful aged human participants respectively. Therefore, the proposed method can be used for the fortitude of memory, attention and cognition in human and will generate a landmark in the sphere of neuroscience.

The differences and similarities between two-sample t-test and paired t-test

临床研究中经常遇到比较实验组和对照组之间的结果。双样本t检验(又称为独立样本t检验)和配对t检验可能是运用于比较两个样本之间均值的最广泛的统计方法。然而,这两种方法的运用会产生混淆,从而导致使用不当。本文中,我们讨论了这两种t检验之间的异同性,并运用三个范例来阐述双样本t检验和配对t检验的计算过程。

Development and Testing of an Automatic Turning Movement Identification System at Signalized Intersections

Vehicle turning movement data from signalized intersections is utilized for numerous applications in the field of transportation. Such applications include real-time adaptive signal control, dynamic traffic assignment, and traffic demand estimation. However, it is very time consuming and costly to obtain vehicle turning movement information manually. Previous efforts to simplify this process were focused on solving the problem using an O-D matrix, but this method proved to be inaccurate and unreliable with the existing data acquisition system. Another study involved the identification of vehicle turning movements from the detector information, but the presence of shared lanes led to uncertainties in vehicle matching, thus limiting application of the method only to intersections without shared lanes. In light of those unsuccessful attempts, this paper develops and tests a system called the Automatic Turning Movement Identification System (ATMIS), which estimates vehicle turning movements at a signalized intersection in real time, regardless of its geometry. The results from lab experiments as well as a field test show that the algorithm is very promising and may potentially be expanded for field applications.

Application of signal sparse decomposition in dynamic test

In dynamic test,sampling rate is high and noise is strong,so a signal sparse decomposition method based on Gabor dictionary is put forward.This method iteratively decomposes the signal with the matching pursuit(MP)algorithm and takes the coherence ratio of the threshold as a condition of iteration termination.Standard MP algorithm is time-consuming,thus an adaptive genetic algorithm is introduced to MP method,which makes computation speed accelerate effectively.Experimental results indicate that this method not only can effectively remove high-frequency noise but also can compress the signal greatly.

测耙数量对进气道稳态畸变特性测量的影响

在现代战斗机进气道相关试验中,受低速辅助进气门打开和隐身大S弯管道、大迎角侧滑角飞行姿态等复杂因素影响,进气道流场畸变较大,不同测耙数量的测试结果相差较大。国内外对进气道出口流场稳态畸变的测量及计算有较多研究,但鲜有测耙数量对进气道稳态畸变测量影响的全面对比研究。本文采用测耙测量进气道大压力梯度区和低压区并计算其稳态畸变,针对进气道风洞试验、全尺寸进发联合台架试验和进发匹配试飞,对常用的6支耙和8支耙形式测量结果进行对比研究。结果表明,对于形状复杂的战斗机进气道而言,进气道出口流场的测试需要尽可能采用8支测耙的测量方式,才能取得满意的结果。特别是舰载战斗机在舰面环境下,受舰首来流及偏流板反射等因素影响,进气道流场更加复杂,且发动机工作在特殊加力状态,对进发匹配稳定性要求也更加苛刻,更有必要采用8支测耙的测量方式。

Adaptive detection in the presence of signal mismatch

The problem of adaptive detection in the situation of signal mismatch is considered; that is, the actual signal steering vector is not aligned with the nominal one. Two novel tunable detectors are proposed. They can control the degree to which the mismatched signals are rejected. Remarkably, it is found that they both cover existing famous detectors as their special cases. More importantly, they possess the constant false alarm rate（CFAR）property and achieve enhanced mismatched signal rejection or improved robustness than their natural competitors. Besides, they can provide slightly better matched signals detection performance than the existing detectors.

Rejection of Direct Blast Interference Based on Signal Phase-Matching Array Processing

In bistaic acoustic testing, there will be strong direct blast interference. An algorithm based on signal phase-matching array processing that rejects direct blast interference in bistatic acoustic testing has been studied, through which the object scattering signal is accurately extracted. Characteristics of bistatic acoustic testing and signal phase matching processing principle are fully integrated in this algorithm. Firstly, the direct blast interference is calculated from the receiving signal based on three subarrays signal phase matching processing. Secondly, the direct blast is rejected by subtraction from the receiving signal. In this way the limitations of the high signal to noise ratio that signal phase matching processing required for direct calculating the object scattering signal can be avoided. Simulation and sea trial results show that, when the ratio of signal to interference is greater than -20 dB, this algorithm of direct blast interference rejection based phase matching signal processing can accurately extract the object scattering signal.

MODEL AND METHOD OF WELL TEST ANALYSIS FORWELLS WITH VERTICAL FRACTURE

Based on the flow mechanism of hydraulic fractured wells, through integrating linear-flow model and effective well-radius model, a new model of well test analysis for wells with vertical fracture was established. In the model, wellbore storage, the damage in the wall of fracture and all kinds of boundary conditions are considered. The model is concise in form, has intact curves and computes fast, which may meet the demand of real-time computation and fast responded well test interpretation. A new method to determine effective well radius was presented, and the correlation between effective well radius and the fracture length, fracture conductivity, skin factor of fracture was given. Matching flow rate or pressure tested, the optimization model that identified formation and fracture parameters was set up. The automatic matching method was presented by synthetically using step by step linear least square method and sequential quadratic programming. At last, the application was also discussed. Application shows that all of these results can analyze and evaluate the fracturing treatment quality scientifically and rationally, instruct and modify the design of fracturing and improve fracturing design level.

微型电动汽车正面碰撞约束系统匹配研究

目前对微型电动汽车相关研究逐渐增多,但碰撞安全性能方面的研究相对较少。基于国内某款微型电动汽车在进行49 km/h正面碰撞后车内Hybrid Ⅲ 50th男性假人伤害程度较高的问题,对该车约束系统的参数匹配进行优化处理。参考相关规范对驾乘人员的保护要求,以仿真分析结果中的头部伤害指标HIC、头部累积3 ms合成加速度、加权综合损伤数值WIC为研究指标,进行极差分析来综合选取参数及水平值;通过正交试验进行优化设计仿真,最终得出最佳约束系统的最佳参数匹配方式,使得微型电动汽车在发生碰撞事故时驾驶员头部位置的伤害得到降低,同时维持或降低胸部和下肢伤害水平,综合损伤也得到降低。结果表明优化后的该约束系统可达到对驾驶员最优的保护效果。

飞机装配过程错漏装检测技术研究进展

飞机装配过程中的错漏装问题对于飞机生产质量和飞行安全具有严重影响。从飞机装配过程错漏装对飞机可靠性和安全性的影响、国内外错漏装检测技术研究现状和飞机装配过程错漏装检测技术的发展和挑战等方面进行了分析,并结合人工智能技术的发展和应用,开展了基于模板匹配、机器学习和深度学习的飞机装配过程错漏装智能检测技术的综述,分析了飞机装配过程错漏装检测技术目前面临的挑战和未来发展方向。

T23/P23钢高强匹配焊缝金属接头再热裂纹表征

综述了T23/P23钢高强匹配焊缝金属接头再热裂纹的特征。结果表明,T23/P23耐热钢高强匹配接头再热裂纹倾向明显,焊后状态高强匹配接头具有较高的强度和可以接受的塑性和韧性。接头显微组织中的HAZ粗晶区碳化物析出、晶界的滑移及晶界的脆化是再热裂纹产生的必要条件;影响HAZ组织的主要因素是母材中碳化物形成元素和残留元素的种类及含量。随接头拘束应力增大,再热温度升高时再热裂纹倾向增大。T23/P23钢接头中氢的行为是产生再热裂纹不可忽视的影响因素。生产中常用低应力化和低氢化综合工艺及参数,以及新型专用焊接材料等措施,使接头中的应力水平降低,氢含量最小化,控制再热裂纹形成条件,并获得了较满意的效果。

中老年人5年内主观认知下降进展的危险因素:一项基于CHARLS的病例对照研究

目的探讨中老年人5 a内主观认知下降(SCD)进展的影响因素。方法选取2011—2018年中国健康与退休纵向研究(CHARLS)数据库中SCD人群为研究对象,根据5 a随访后的自身前后认知评分改变评估分为SCD进展组和SCD非进展组,使用1∶1倾向性评分匹配方法控制一般资料,匹配后的人群采用Logistic回归模型,分析SCD进展的影响因素。结果基线检查时报告3864例SCD中,258例SCD进展(6.68%);匹配前2组性别、BMI、教育水平、吸烟、CES-D 10得分、就餐模式、舒张压、平衡测试、握力、CRP水平差异有统计学意义;将匹配后2组比较中P<0.1的变量纳入Logistic回归分析,纳入CES-D 10得分(χ^(2)=2.494,P=0.01)、舒张压(Z=11.946,P=0.10)、平衡测试(Z=3.853,P=0.06)、CRP水平(Z=-1.646,P=0.10),结果显示CES-D 10得分(P=0.01,OR=1.092,95%CI:1.019~1.171)以及平衡测试(P=0.03,OR=0.643,95%CI:0.427~0.967)可能是SCD人群5 a后进展的危险因素。结论更高的CES-D 10得分及不能完成平衡测试对SCD人群短期发生认知障碍进展有不利影响。

反复输血者血小板抗体对血小板输注效果的影响研究

目的分析反复输血者血小板抗体对血小板输注效果的影响,以便为日后临床提供参考。方法回顾性分析2023年1月至2023年12月焦作市人民医院收入的1216例反复输血患者,对其开展血小板抗体检测,分析抗体呈阳性的患者输注血小板的治疗效果;根据患者的血小板抗体检验结果,将配型为阴性或弱阳性的供者标本归类为相符亚组,而多次配型为阳性的供者标本则归类为不符亚组。对比首次输注后的阳性组和阴性组,以及相符亚组与不符亚组本次输注后的情况,分析1 h和24 h的血小板校正增高计数(CCI)以及血小板回收率(PPR)之间的差异。通过Spearman相关系数模型,总结1 h和24 h的血小板CCI以及PPR与血小板抗体检验、以及交叉配型试验结果之间的相关性。结果相较于阳性组患者,阴性患者CCI、PPR指标及输注效果均明显升高,且血小板输注无效(PTR)发生率降低,差异有统计学意义(P<0.05);相符亚组输注后l h、24 h CCI及PPR水平均高于不符亚组,差异有统计学意义(P<0.05);Spearman相关系数模型分析结果显示,血小板抗体检测结果与CCI、PPR水平呈负相关,交叉配型结果与CCI、PPR水平呈正相关,差异有统计学意义(P<0.05)。结论患者在接受多次输血后,血小板抗体的检测阳性率相对较高,抗体生成直接关系输注血小板疗效。检测血小板抗体和进行交叉配型的结果与患者接受的血小板输注效果密切相关。

基于大数据的抽油机井硬件匹配技术研究

为了进一步提高抽油机井的运行效率,适应未来一段时间内的抽油机井产量和流动液面变化,应用了基于大数据分析的抽油机井硬件匹配技术。以日产液量分级、举升高度等参数作为单井硬件设备匹配方案的优选参数,按照能耗最优的原则形成硬件设备匹配模板,适应抽油机井未来一段时间内的产液量及生产参数的变化,降低了抽油机井的能耗及维修维护性成本,满足了抽油机井低成本开发的需要。通过4口井进行验证,电动机平均装机功率下降了13.29%,平均功率利用率上升了2.24个百分点,取得了较好的效果,为后期油田智能化建设提供技术支撑。

解冻卵裂期胚胎养成囊胚行植入前遗传学检测二次冷冻复苏移植后临床结局

目的 回顾性评估解冻卵裂期胚胎养成囊胚后进行活检,再次冷冻移植后临床及新生儿结局,以期为临床医生和患者提供参考数据。方法 收集2017年1月至2022年10月于西北妇女儿童医院生殖中心接受解冻卵裂期胚胎养成囊胚后进行活检,再次解冻移植治疗的患者的冻融胚胎移植周期为实验组(n=13),并将女方新鲜周期取卵时年龄、移植囊胚级别、胚胎植入前遗传学诊断的指证以及分类作为匹配因素,按照1∶3配对,选取同周期新鲜囊胚活检、解冻后移植的患者作为对照组(n=39)。比较两组患者的临床基线资料、妊娠结局以及新生儿结局。结果 两组患者临床基本资料、妊娠率以及活产率均无统计学差异(P>0.05),两组产科及新生儿结局亦无显著性差异(P>0.05)。两组患者均未报道重大产科并发症和新生儿畸形。结论 将冻存的卵裂期胚胎解冻后培养至囊胚期进行活检,行胚胎植入前遗传学检测,冷冻后再次复苏行冻融移植周期的妊娠率、活产率及新生儿结局与新鲜囊胚活检后进行冻融移植无明显差异,可以为患者提供更多的选择。