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基于ISAR像序列的弹道目标进动特征提取  [PDF]
金光虎,高勋章,黎〓湘,陈永光
电子学报 , 2010,
Abstract: 中段弹道目标进动特征是分辨弹头及诱饵的重要依据.以二维ISAR图像序列为基础,分析了弹道目标成像特点和目标姿态角的变化过程,提出了基于图像配准的ISAR像姿态差估计方法;采用等间隔配准避免了配准奇异,根据姿态差二次方曲线实现了进动参数的估计,给出了计算目标进动角、进动周期的具体步骤.仿真结果表明,该方法能够实现弹道目标进动特征提取,估计精度较高.
?横轴改?  [PDF]
程滋民
地质与勘探 , 1957,
Abstract: 103?利用500m?机?横?改?成300m??用横?,解决了备件缺乏??。其方法是将500m?横轴的键槽用雷焊填补,再车成300m转机横轴的设计尺寸,即可使用.
Decoding of Visual Attention from LFP Signals of Macaque MT  [PDF]
Moein Esghaei, Mohammad Reza Daliri
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0100381
Abstract: The local field potential (LFP) has recently been widely used in brain computer interfaces (BCI). Here we used power of LFP recorded from area MT of a macaque monkey to decode where the animal covertly attended. Support vector machines (SVM) were used to learn the pattern of power at different frequencies for attention to two possible positions. We found that LFP power at both low (<9 Hz) and high (31–120 Hz) frequencies contains sufficient information to decode the focus of attention. Highest decoding performance was found for gamma frequencies (31–120 Hz) and reached 82%. In contrast low frequencies (<9 Hz) could help the classifier reach a higher decoding performance with a smaller amount of training data. Consequently, we suggest that low frequency LFP can provide fast but coarse information regarding the focus of attention, while higher frequencies of the LFP deliver more accurate but less timely information about the focus of attention.
"双进"感悟  [PDF]
孙坦
图书情报工作 , 2002,
Abstract: ?在阳光明媚的春夏之交,"双进"(指进入新馆,进入创新)工作结出了丰硕的果实,"科图"人用自己的勤劳和智慧为中关村又增添了-道亮丽的风景--中国科学院文献情报中心新馆.作为一名直接参与"双进"工作的"科图"新兵,像很多老一辈"科图"人和老读者一样,热切地期盼着新馆能够真正成为一座"智慧骤站,科学殿堂",为科研人员提供符合时代需求的方便快捷的信息服务和信息资源保障,成为知识创新不可或缺的基础设施.
LFP-915A微机型母线保护装置  [PDF]
李力,吕航,沈国荣,郑玉平
电力系统自动化 , 2000,
Abstract: 介绍了电力自动化研究院继电保护所研制的新型LFP-915A微机型母线保护装置的硬件组成、保护原理及功能。该装置采用了自适应阻抗加权法抗电流互感器饱和的新原理,利用工频变化量比率差动与常规比率差动相结合的新判据,由此构成完善的母线差动保护。此外,LFP-915A装置还具有母联充电保护、死区保护、母联失灵保护、断路器失灵保护等保护功能以及完善的事件报文处理及录波打印功能。
LFP-901A和LFP-902A保护在特殊故障时的性能分析  [PDF]
沈国荣,郑玉平,戴学安,彭华农
电力系统自动化 , 1999,
Abstract: 以运行实践记录到的一些特殊故障,验证了LFP-900系列保护的性能,例如在振荡闭锁期间发生故障的保护性能;高电阻接地故障的保护性能;单侧电源线路故障受电侧选相跳闸的性能;单侧空充线路运行发生故障时,纵联保护的性能。传统保护对这些故障或拒动,或延时,或无能为力,而LFP-900系列保护则有严密的考虑,可正确、快速切除故障。
管钳子改??活  [PDF]
直爽
地质与勘探 , 1957,
Abstract: ?探??常用的工具――管?子,在工作中损坏是?多的,特?是?子?和?子箍更易?坏,而?子把损坏的?少。因此利用?子把再加工改??活成管?子是一?有效的节?措施。105勘探?已??用?一方法,解?了管?子改??活?题。他们的改??程是:???的???加?剁?,每????可?成????。剁?后,再加?至可??度(?1150°~200℃左右),?行?加工成?子?形?,再???工加工即成成品。其次再利用??粒??(如?之1)改??子箍,首先作成如?之2及3所示的???模,其中3?芯模,4??模。具?作法是???粒??按改?管?子箍所需的?度在?床上切好,放在?中加?,
A New Approach of Solving Linear Fractional Programming Problem (LFP) by Using Computer Algorithm  [PDF]
Sumon Kumar Saha, Md. Rezwan Hossain, Md. Kutub Uddin, Rabindra Nath Mondal
Open Journal of Optimization (OJOp) , 2015, DOI: 10.4236/ojop.2015.43010
Abstract: In this paper, we study a new approach for solving linear fractional programming problem (LFP) by converting it into a single Linear Programming (LP) Problem, which can be solved by using any type of linear fractional programming technique. In the objective function of an LFP, if β is negative, the available methods are failed to solve, while our proposed method is capable of solving such problems. In the present paper, we propose a new method and develop FORTRAN programs to solve the problem. The optimal LFP solution procedure is illustrated with numerical examples and also by a computer program. We also compare our method with other available methods for solving LFP problems. Our proposed method of linear fractional programming (LFP) problem is very simple and easy to understand and apply.
LFP-900系列微机线路保护在广东500 kV系统中的应用  [PDF]
黄河,孔伟彬
电力系统自动化 , 1999,
Abstract: 将国产LFP-900系列微机线路保护用于广东省500kV输变电线路设计中。对其与进口复用载波机接口、断路器保护配置、死区保护、电压断线闭锁、抗干扰等问题提出了解决办法,并对LFP-900系列线路保护提出改进建议。
Novel Cluster Validity Index for FCM Algorithm
Jian Yu,Cui-Xia Li,
Jian
,Yu,and,Cui-Xia,Li

计算机科学技术学报 , 2006,
Abstract: How to determine an appropriate number of clusters is very important when implementing a specific clustering algorithm, like c-means, fuzzy c-means (FCM). In the literature, most cluster validity indices are originated from partition or geometrical property of the data set. In this paper, the authors developed a novel cluster validity index for FCM, based on the optimality test of FCM. Unlike the previous cluster validity indices, this novel cluster validity index is inherent in FCM itself. Comparison experiments show that the stability index can be used as cluster validity index for the fuzzy c-means.
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