New normalized nonlocal hybrid level set method for image segmentation

This article introduces a new normalized nonlocal hybrid level set method for image segmentation.Due to intensity overlapping,blurred edges with complex backgrounds,simple intensity and texture information,such kind of image segmentation is still a challenging task.The proposed method uses both the region and boundary information to achieve accurate segmentation results.The region information can help to identify rough region of interest and prevent the boundary leakage problem.It makes use of normalized nonlocal comparisons between pairs of patches in each region,and a heuristic intensity model is proposed to suppress irrelevant strong edges and constrain the segmentation.The boundary information can help to detect the precise location of the target object,it makes use of the geodesic active contour model to obtain the target boundary.The corresponding variational segmentation problem is implemented by a level set formulation.We use an internal energy term for geometric active contours to penalize the deviation of the level set function from a signed distance function.At last,experimental results on synthetic images and real images are shown in the paper with promising results.

The Effect of Life Skills Training on the Mental Health and Level of Resilience among Teachers of Normal Students and Teachers of Exceptional Students in Zahedan

This is an experimental study conducted on two groups of control and experimental using pretestposttest design, applying psychological intervention on the study sample. The present study aimed to determine the effectiveness of collective education life skills on mental health and resilience of teachers in Zahedan. The population of the study included all teachers at schools with normal students and teachers at schools with exceptional students in Zahedan, among which 60 teachers at normal schools and 20 teachers at exceptional schools were selected and placed in two groups of experimental and control, respectively. Initially, members of the experimental group were taught 10 basic life skills in 10 2-hour sessions. Mental health and resilience questionnaires were distributed and gathered before and after the training sessions. Results indicated the positive effect of life skills training on mental health of teachers at schools with normal students and teachers at schools with exceptional students, which meant that the more the life skills training to teachers at schools with normal students and teachers at schools with exceptional students, the lower their mental health scores would be. Results also indicated the positive effect of life skills training on resilience of teachers at schools with normal students and teachers at schools with exceptional students, which meant that the more the life skills training to teachers at schools with normal students and teachers at schools with exceptional students, the higher their resilience scores would be.

龙云灌区新建水源工程正常蓄水位方案比选

水库正常蓄水位方案比选是确定水库规模的一个重要环节,关系到工程实施的经济性和可行性。本文以广西玉林市龙云灌区工程为例,研究提出了串联水库正常蓄水位方案比选的原则和方法,得出了经济合理的正常蓄水位成果。

带多级免赔额的风险保费及其贝叶斯估计

在汽车保险中,保单设计常常会提供多个级别的免赔额以供被保险人选择.因此,在汽车保险的聚合风险模型中,将索赔额按大小分为若干级别.进而,建立了在均值-方差保费原理下风险保费的贝叶斯模型,并获得了风险保费和贝叶斯估计的显式解.研究结论显示:在一定条件下,贝叶斯估计能表达为样本估计和聚合估计的加权平均.同时,研究了风险保费的线性贝叶斯估计,获得了在任意分布下风险保费的最优信度估计,证明了贝叶斯估计和信度估计的强相合性和渐近正态性.最后,利用数值模拟方法验证了估计的大样本性质.

智能时代高水平师范大学研究型教师培养的路径研究

随着人工智能的发展,提高中小学生的创新能力是我国教育面临的重大问题。高水平师范大学应发挥引领示范作用,改革教学模式,培养研究型教师。首先要将教学和科研并举,兼顾师范生的教学能力与科研能力;在课程设置上要建立以培养教师研究能力为核心的课程体系,压缩课程总量,增加研究方法课程;在教学方法上,高水平师范大学应从以教师教为主转变为以学生学为主,兴建小班讨论教室,成立写作指导中心,引导学生更多地阅读、讨论、思考和写作,提升教师的科研素养。

基于Normal需求的二级零售系统最优库存水平确定

考虑客户需求是随机的且服从Normal分布,由一个分销中心和N个零售商组成的两级分销库存系统.假设两级库存补充均采取周期订货策略,当产品缺货时,顾客愿意等待特别订货的概率为一常数.我们的目标是在满足给定的客户服务水平的条件下,寻求两级库存总费用的最小化.对库存费用的计算进行了精确地推导,并且得到了最优的库存水平.

基于置信水平的钢轨焊接接头设备状态评定方法

[目的]为解决我国无缝线路钢轨设备状态评定体系不完善的问题,需要建立基于置信水平的钢轨焊接接头设备状态评定方法。[方法]阐述了目前我国规定的高速铁路钢轨平直度允许偏差、焊接接头平直度允许偏差。以我国某条已开通运营13年的高速铁路为案例,对该线钢轨焊接接头平直度数据进行分析,认为钢轨接头平直度检测数据总体服从正态分布。根据正态分布及置信区间原理,对均值和标准差评定法、置信水平评定法进行对比,提出了基于置信水平的钢轨焊接接头设备状态评定方法,得到高速铁路钢轨设备状态的评定标准。[结果及结论]该方法能够客观、直观地反映出钢轨焊接接头的设备状态,可以准确地掌握钢轨设备状态。该方法可为分析钢轨设备变化规律,以及制定大中修的标准、计划及方案等提供很好的理论依据。

商场建筑碳排放限额分析研究

调研广东省范围内商场建筑的能源消耗情况,分析碳排放核算与限额数据,可为后续的建筑碳达峰与碳中和标准制修订工作提供数据基础。本研究的调研工作收集多个样本建筑的基本信息和能源数据,并采用排放因子法核算了建筑碳排放量,得出了商场建筑单体碳排放量与单位面积碳排放指标的规律与特点,并使用统计限额法计算出商场建筑单位面积碳排放指标约束值、基准值和引导值。

合江水电站正常蓄水位抬高效益影响和补救措施研究

为提高合江水电站水力资源利用率和改善五华县城区水景观,拟抬高合江水电站的正常蓄水位。本文分别从水电站发电效益、河道水景观效益、排水和浸没影响3方面分析了电站正常蓄水位抬高的效益影响,对不同水位抬高方案进行比选,并基于选定的水位抬高方案提出了合理的工程与非工程补救措施以消除不利影响。

吊钟水库正常蓄水位论证分析

为合理选择水库正常蓄水位,遵循合理利用工程所在地区的地形地质条件,充分利用水资源,在保证工程任务和效益的基础上,尽可能降低库区淹没影响和工程投资的基本原则,初拟94.50 m、95.50 m和96.50 m共3个正常蓄水位方案进行综合技术经济比选。综合工程地质条件、水库淹没处理、枢纽及建筑物布置、生态环境、水资源利用及工程经济性,推荐吊钟水库正常蓄水位95.50 m。

伶俐水库正常蓄水位选择研究

在伶俐水库及灌区工程规模论证时,初步拟定了5个正常蓄水位方案进行比选分析。在此基础上,运用层次分析法以工程造价、工程效益、生态环境影响、库区淹没影响、工程布置及施工条件等为评价指标进行定量分析。经综合比选分析,初步选定了伶俐水库正常蓄水位为115.0m,为后续伶俐水库及伶俐灌区前期工作的开展提供了支撑。

学校教育建筑碳排放指标限额分析研究

在我国建筑领域碳达峰和碳中和过程中,建立并完善建筑碳排放管理体系十分必要,只有有效开展碳排放核算与限额分析研究,才能为相关标准修订工作提供数据支撑。文章收集筛选广东省内典型学校教育建筑的基本信息及能源数据,并采用排放因子法对其碳排放进行核算,得出其单体碳排放量与单位面积碳排放指标并总结规律,再用统计限额法对限额值进行排序计算,并对其单位面积碳排放指标限额的引导值、基准值和约束值给出建议。

我国陆地区域似大地水准面对数字化测图的适用性分析

全球导航卫星系统(GNSS)与区域似大地水准面能够代替低等级水准测量,获取正常高成果。为服务于各省不同比例尺测图项目,本文分析我国陆地区域似大地水准面对数字化测图的适用性。首先,统计国内各省(市)的区域似大地水准面精度情况;然后,推导不同比例尺测图中,似大地水准面模型为满足不同地形类别下高程点的限差应达到的精度。结果表明,大多数省(市)的区域似大地水准面模型均优于±0.1 m,能够满足中大比例尺测图需要,可以为各省开展不同比例尺测图提供技术服务。

IL-28B polymorphisms and treatment response in hepatitis C virus patients with persistently normal alanine aminotransferase

AIM:To examine the association between the interleukin 28B(IL-28B)genotype and treatment response in hepatitis C virus(HCV)-infected patients with persistently normal alanine aminotransferase(PNALT).METHODS:We compared the treatment response of HCV-infected patients with PNALT to that of patients with non-PNALT.Between February 2010 and April2013,278 patients infected with HCV were enrolled in this study.All of the patients were treated with peginterferon-alpha 2a or 2b plus ribavirin.In addition,180μg of peginterferon alpha-2a or 1.5μg/kg peginterferon alpha-2b per week plus weight-based ribavirin(600-1000 mg/d)were typically administered for 24 wk to HCV genotype 2-infected patients or for 48-72 wk to HCV genotype 1-infected patients.In all of the patients,the IL-28B rs8099917 genotype was determined using a TaqMan single-nucleotide polymorphism assay.HCV RNA was measured using the COBAS TaqMan HCV test.RESULTS:Female patients were dominant in the PNALT group(P【0.0001).Among 72 HCV genotype 1-infected patients with PNALT,the early virologic response(EVR)rates(P【0.01)and the sustained virologic response(SVR)rates(P【0.01)were higher in patients with the IL-28B TT genotype than in those with the IL-28B TG/GG genotype.In HCV genotype 1-infected patients with PNALT,multivariate logistic-regression analysis showed that SVR was independently predicted by the IL-28B rs8099917 TT type(P【0.05)and having an EVR(P【0.01).The IL-28B rs8099917 TT genotype strongly correlated with treatment response in HCV genotype 1-infected Asian patients with PNALT.CONCLUSION:The IL-28B genotype may be useful for selecting HCV genotype 1-infected patients with PNALT who should receive interferon-based treatment.

Accuracy Improvement of PLIC-VOF Volume-Tracking Method Using the Equation of Surface Normal Vector

The PLIC/SN method that combines the second-order volume tracking method (PLIC-VOF) with the equation of surface normal (SN) vector was recently proposed (M. Sun, “Volume Tracking of Subgrid Particles,” International Journal for Numerical Methods in Fluids, Vol. 66, No. 12, 2011, pp. 1530-1554). The method is able to track the motion of a subgrid particle, but the accuracy is not as good as expected on high resolution grids for vortical flows. In this paper, a simple unsplit multidimensional advection algorithm is coupled with the equation of SN vector. The advection algorithm is formulated as the finite volume method, so that it can be used readily for both structured and unstructured grids while maintaining the exact mass conservation. The new method improves the accuracy significantly for high resolution grids. In the well-known test of the time-resolved vortex problem of T = 2, the circular interface is resolved with an accuracy better than ever using the equation of SN vector.

已建坝正常蓄水位调整论证方法研究

已建坝正常蓄水位调整是挖掘水库兴利能力的有效途径,但目前缺乏明确可靠的论证方法。采用水文学、大坝安全、大坝风险及生态环境理论,研究已建坝正常蓄水位调整必要性的影响因素及特征,分析调整后水库防洪安全、工程安全、库区淹没、库岸结构、库区水环境所受影响特征,提出了正常蓄水位调整必要性论证的6个一级、14个二级指标体系,以及调整后影响论证的7个一级、23个二级指标体系及其分析方法,构建调整方案风险效益分析方法,并应用于杭州青山水库正常蓄水位调整论证。结果表明:针对青山水库将正常蓄水位提高2.0 m的推荐方案,提出的论证指标体系和论证方法合理有效。

引黄灌渠生态护坡技术

生态护坡是促进边坡生态恢复和减少地质灾害的主要技术措施。基于生态环境学理论和地质灾害防治理论,分析当前常用生态护坡类型的适应性,综合不同类型生态护坡的“固、保、透、滤、柔”等优点,针对开封段引黄灌渠多为硬质护坡的现状和砂质土的特性,因地制宜地提出适合灌区渠道常水位以上使用的装配式PET网袋箱生态护坡。为了探讨该方案的可行性,设计了4种试验工况,通过试验对比验证PET网袋箱生态护坡的性能。试验结果表明:使用PET网袋箱生态护坡的土体与原生态护坡相比,抗剪强度增强较多,尤其是土体的黏聚力比原生态护坡增强约110%,同时PET网袋箱生态护坡相较于混凝土、浆砌石、六棱砖护坡在滤土排水、便于施工、工程造价、生态环保等方面优势明显,可为类似生态护坡工程提供参考依据,以期助力黄河流域生态保护和高质量发展。

血清前列腺特异抗原正常的前列腺癌6例报告及文献复习

目的 分析6例术前前列腺特异抗原(PSA)处于正常水平的前列腺癌患者的临床资料,为进一步提高前列腺癌的诊断水平提供有价值的参考指标。方法 回顾性分析于我院行经会阴前列腺穿刺活检或经尿道前列腺手术病理确诊的6例前列腺癌患者的临床资料。分析总结其在年龄、临床表现、体质指数(BMI)、前列腺特异抗原密度(PSAD)、血甘油三酯、血胆固醇、彩超、磁共振、病理类型、Gleason评分的特点。结合文献总结PSA处于正常水平的前列腺癌患者的临床特点及高危因素。结果 2例前列腺穿刺病理确诊,4例前列腺电切术后病理确诊,3例血脂偏高,3例骨显像阴性,另外3例未查。PSAD 0.017~1.215。彩超提示形态不规整2例,回声不均匀2例,两者均有1例,所有6例均提示钙化。在行磁共振检查的3例中2例磁共振提示结节,多参数核磁共振的前列腺影像报告和数据评分系统(PIRADS) 4级;1例PIRADS 5级,并提示侵犯精囊腺、直肠、膀胱后壁、双侧神经血管束(NVB)增粗、盆腔淋巴结肿大。5例病理提示前列腺腺泡腺癌,其中4例Gleason评分3+3=6,1例5+5=10。1例提示高级别神经内分泌癌。结论 PSA正常水平前列腺癌临床检出率偏低,临床上要注意结合其特点及高危因素综合判断。

基于二阶锥规划和NNC法的交直流混合配电网双层规划模型及其求解方法

随着直流配电技术的快速发展,未来交直流混合的拓扑结构将成为智能电网的重要形态,如何实现交直流混合配电网的规划及求解成为一个亟需解决的问题。为此,该文提出一种交直流混合配电网双层规划模型,同时综合考虑源-网-荷-储的协同优化运行。上层规划层,以投资成本和运行成本的综合成本最小为目标,考虑线路、分布式电源(distributed generation, DG)和储能系统(energy storage system,ESS)的投资规划;下层运行层,以运行成本和电压偏移量最小为目标,考虑有载调压变压器(on-load tap changer,OLTC)、分组投切电容器(capacitor banks,CB)、开关、可削减负荷、电压源型换流器(voltage source converter,VSC)、DG及ESS这些主动调控对象的控制。同时,为了有效地求解此双层模型,对模型上、下层进行关联建模,将其转换为单层模型,并采用二阶锥松弛、Big-M法和McCormick线性化方法等将此单层模型转化为混合整数二阶锥规划(mixed integer second-order cone programming,MISOCP)模型。由于最终的MISOCP单层模型为多目标优化问题,采用归一化法向约束法(normalized normal constraint,NNC)进行求解,以获取均匀的帕累托前沿。最后,对改进的交直流混合配电系统进行仿真分析,验证模型的有效性。

新江海河航道梯级布置方案技术经济分析

针对新江海河航道双桥枢纽与新江海枢纽距离近、水位差小且上下游平水期长,对双桥梯级方案取消与否两种方案进行技术经济分析。结果表明,取消双桥梯级方案对区域防洪、排涝、水系连通、水质等影响较大,水系恢复工程总投资和营运费用高,项目内部收益率低;保留双桥梯级方案维持现有水系布局,船闸具备开通条件,可与新江海河船闸联合调度,共用待闸锚地,经济上合理。