飞机典型装配工艺挖掘技术研究

针对飞机典型装配工艺，首先采用分类编码技术，将飞机装配工艺数据进行编码处理，在此基础上，应用聚类算法对装配工艺进行分类，然后应用FP—growth算法提取各类的典型装配工艺。以某企业实际的装配工艺数据为例，对挖掘方法进行了论述和验证，表明该方法是可行的。     

Fingerprints of anthocyanins and flavonols of Vaccinium uliginosum berries from different geographical origins in the Greater Khingan Mountains and their antioxidant capacities

The Greater Khingan Mountains region is the largest natural distribution area of wild Vaccinium uliginosum L. in China. V. uliginosum berries from 16 representative geographical origins in this region were systematically investigated in this study. The anthocyanin and flavonol contents and the antioxidant capacities of V. uliginosum berries measured in this study were generally higher than those reported from previous studies investigating berries from other regions of China, but significant variations were detected. Significant positive correlations were detected between the bioactive component content in fresh berry peels of V. uliginosum and latitude. Our results indicated that the ‘Greater Khingan Mountains’ can be used as a geographical indication for V. uliginosum berries produced in this region to reflect their high bioactive component content. However, we suggest that some more specific geographical indications should be used to ensure quality control and to label V. uliginosum with superior bioactive component content, such as V. uliginosum from locations L14 and L15.     

Development of an event-specific assay for the qualitative and quantitative detection of the genetically modified flax CDC Triffid (FP967)

The genetically modified flax, event FP967, with tolerance to sulfonylurea herbicides, is one of the commercial genetically modified events approved in Canada and USA.This event is not authorized in Switzerland and EU, therefore, a method to specifically detect the CDC Triffid line, was required. We revealed the 3′ integration junction sequence between host plant DNA and the integrated gene construct FP967 by means of Restriction Site PCR and both a qualitative and a quantitative PCR detection assays were developed. The qualitative PCR revealed a limit of detection of 0.01% of GM flax in 100 ng of genomic DNA. The quantitative PCR assay showed a limit of detection of about 9 haploid genome copies. The specificity and sensitivity of the assay indicate that the developed event-specific PCR methods can be used for identification and quantification of FP967 flax.     

基于FPGA的100MHz近红外单光子探测器

为克服InGaAs/InP雪崩二极管(APD)光电探测器的后脉冲现象,本文提出了基于FPGA的单光子探测器(SPD)测量系统,其门控频率最高可达100MHz,门控宽度最窄可到1ns,死区时间设定为109ns,并且这些参数都易于调节且有助于减少后脉冲概率。实验结果表明:在以上门控条件并且制冷温度为218K时,探测器的有效门宽为0.79ns;在死区时间超过109ns时,后脉冲现象可忽略;最大光子探测效率(PDE)约为14%;在光子探测效率为10%时,暗计数率(DCR)约为2×10-5/ns;并具有小型化、易调节的特点。     

共轭凸轮机构两滚子间最小跨距问题讨论的延伸

针对FP型和PF型两种新的共轭凸轮机构结构形式，研究解决了该两种直动从动杆共轭凸轮机构两滚子中心间最小跨距的确定问题。     

尾纤化非共焦FP谐振腔及其在光纤频分复用系统中的应用

报道了一种带输入单模光纤尾纤的器件化非共焦ＦＰ谐振腔，腔细度在１００以上，插入损耗低于５ｄＢ。该腔被应用于一个二路１４０Ｍｂ／Ｓ频分复用光纤传输系统中，借助于一精心设计的电子伺服系统，该腔在长期的系统实验中显示了十分优良可靠的性能。     

一种优化FP-growth的支持度相同项的排序算法

Han等人提出了频繁模式增长FP-growth算法,该算法在第一次扫描数据库后,得到频繁项集合和每个频繁项的支持度,并按支持度降序排列,但没有对支持度相同项的排列做进一步说明。本文依据"越是频繁出现,越可能被共享"的建树原则,提出了通过比较该项与前后项项集的支持度,较大者先排列的方法,使后续构建的FP-tree比任意排序构建的FP-tree更优。     

Computer-aided detection and classification of microcalcifications in mammograms: a survey

Breast cancer continues to be a significant public health problem in the world. Approximately, 182,000 new cases of breast cancer are diagnosed and 46,000 women die of breast cancer each year in the United States. Even more disturbing is the fact that one out of eight women in US will develop breast cancer at some point during her lifetime. Primary prevention seems impossible since the causes of this disease still remain unknown. Early detection is the key to improving breast cancer prognosis. Mammography is one of the reliable methods for early detection of breast carcinomas. There are some limitations of human observers, and it is difficult for radiologists to provide both accurate and uniform evaluation for the enormous number of mammograms generated in widespread screening. The presence of microcalcification clusters (MCCs) is an important sign for the detection of early breast carcinoma. An early sign of 30–50% of breast cancer detected mammographically is the appearance of clusters of fine, granular microcalcification, and 60–80% of breast carcinomas reveal MCCs upon histological examinations. The high correlation between the appearance of the microcalcification clusters and the diseases show that the CAD (computer aided diagnosis) systems for automated detection/classification of MCCs will be very useful and helpful for breast cancer control. In this survey paper, we summarize and compare the methods used in various stages of the computer-aided detection systems (CAD). In particular, the enhancement and segmentation algorithms, mammographic features, classifiers and their performances are studied and compared. Remaining challenges and future research directions are also discussed.     

FP-Tree算法在饰品设计中的应用

饰品设计具有很强的主观性,一款饰品设计的成功很大程度上取决于设计师对市场与工艺的把握。为了让设计师们更好的了解市场与工艺,提出利用FP-Tree挖掘的方法对销售数据与生产数据进行挖掘,从而找到隐藏于数据中的设计规律以供设计师参考,从而提高企业新产品与市场的贴近程度,减少开发的成本。     

Effect of pre- and postharvest salicylic acid treatment on ethylene production,fungal decay and overall quality of Selva strawberry fruit

The effect of salicylic acid (SA) treatment at different concentrations and growth stages of strawberry (Fragaria ananassa cv. Selva) fruit on postharvest ethylene production, fungal decay and overall quality index was studied. SA at all concentrations effectively reduced fruit ethylene production and fungal decay and retained overall quality. Treatment of plants at vegetative stage and fruit development stage followed by postharvest treatment of fruits with 1 and 2 mmol L⁻¹ was the most effective strategy, whilst with decrease in treatment time the effects of treatment decreased. Single stage treatment strategy of fruits with 2 mmol L⁻¹ SA at postharvest stage was most effective. Postharvest treatment with 4 mmol L⁻¹ SA slightly damaged the fruits and was less effective than 2 mmol L⁻¹ in retaining fruit quality.