检索范围：
排序： 展示方式：
Multi-color space threshold segmentation and self-learning k-NN algorithm for surge test EUT status
Jian HUANG,Gui-xiong LIU
《机械工程前沿（英文）》 2016年 第11卷 第3期 页码 311-315 doi: 10.1007/s11465-016-0376-z
The identification of targets varies in different surge tests. A multi-color space threshold segmentation and self-learning k-nearest neighbor algorithm (k-NN) for equipment under test status identification was proposed after using feature matching to identify equipment status had to train new patterns every time before testing. First, color space (L*a*b*, hue saturation lightness (HSL), hue saturation value (HSV)) to segment was selected according to the high luminance points ratio and white luminance points ratio of the image. Second, the unknown class sample Sr was classified by the k-NN algorithm with training set Tz according to the feature vector, which was formed from number of pixels, eccentricity ratio, compactness ratio, and Euler’s numbers. Last, while the classification confidence coefficient equaled k, made Sr as one sample of pre-training set Tz′. The training set Tz increased to Tz+1 by Tz′ if Tz′ was saturated. In nine series of illuminant, indicator light, screen, and disturbances samples (a total of 21600 frames), the algorithm had a 98.65% identification accuracy, also selected five groups of samples to enlarge the training set from T0 to T5 by itself.
关键词： multi-color space k-nearest neighbor algorithm (k-NN) self-learning surge test
Baochen WEI, Feng GAO
《机械工程前沿（英文）》 2012年 第7卷 第2期 页码 109-119 doi: 10.1007/s11465-012-0323-6
Working capacity refers to the velocity output and force output of a manipulator. It is usually be represented by output capacity space. In this paper, the method of Linear Programming and a geometric method are proposed to calculate working capacity spaces in different situations. With the consideration of gravity effect of every component, the output force capacity space of heavy duty manipulators is calculated. The results show that the effect of the gravity is a translation of the capacity space. This paper gives a method for the output capacity express especially for heavy duty manipulators. The output capacity space can be helpful to the driving parameters selection. With the consideration of the gravity effect of every component and the friction at the joints, the excavating force capacity space of the heavy-load excavating mechanism is calculated and is represented as a multi-dimensional polytope. The results show that the effect of the gravity and friction is to translational act on the capacity space.
关键词： working capacity multi-DOF manipulator capacity polytope excavating mechanism
王安全,程晓舫,陆少松
《中国工程科学》 2002年 第4卷 第8期 页码 54-57
介绍了彩色测温方法的基本原理，并基于可见光波段内光谱发射率的线性模型给出物体辐射颜色色品的表述；明确了一个色品最多只能求解出两个温度；解决了彩色测温方法中物体辐射色域的界定问题，并将辐射色域划分为温度单解域和双解域。
Jie JI, Junrui DUAN, Huaxian WAN
《能源前沿（英文）》 2022年 第16卷 第6期 页码 1017-1026 doi: 10.1007/s11708-020-0716-x
关键词： flame interaction air entrainment flame height multi-point source model thermal radiation
潘德炉,白雁
《中国工程科学》 2008年 第10卷 第9期 页码 14-24
介绍了近年来我国在海洋水色遥感应用工程技术方面的新进展，包括以应用为导向的关键技术研究和各类应用示范系统的开发等。针对当前海洋水色遥感业务化应用服务所面临的问题和一些急需解决的关键工程技术进行了分析和展望。
叶培建,彭兢
《中国工程科学》 2006年 第8卷 第10期 页码 13-18
对人类已经开展的深空探测活动进行了回顾，简介了近期已开展和未来5年内将要开展的深空探测任务，以及未来主要航天国家的深空探测规划，提出了未来我国开展深空探测应掌握和突破的关键技术；介绍了我国深空探测的现状，对绕月探测工程和嫦娥1号进行了简介，重点介绍了探月工程二、三期的思路和二期工程的立项论证情况和初步总体方案，同时简要叙述了正在论证中的中俄联合火星探测、夸父计划、硬X射线天文望远镜和空间太阳望远镜等项目的概况；给出了对我国未来深空探测发展方向的思考和展望。
Investigations on color variations of
Guanglan LIAO, Haibo ZUO, Xuan JIANG, Xuefeng YANG, Tielin SHI
《机械工程前沿（英文）》 2012年 第7卷 第4期 页码 394-400 doi: 10.1007/s11465-012-0347-y
Experiments and simulations are carried out to investigate the optical properties of butterfly wing scales. The upper surface of a male butterfly wing presents a single-layer of scales, the microstructures of which are responsible for the brilliant blue color. The color varies from cyan blue to yellow green and soon afterwards returns back to cyan blue when some ethanol is dropped on the upper surface. At the start of the ethanol volatilization process, the reflection spectrum remains stable. As the ethanol further volatilizes, the peak reflectance decreases slightly, then increases dramatically. Meanwhile, the peak wavelength keeps approximately constant, then decreases, and keeps almost stable at the end of the process. Therefore, the optical properties depend strongly on the varying ambient conditions, including the refractive index and the thickness of the packing medium. Moreover, the possible causes for the scales in dark green region after several dropping ethanol experiments are clarified. This research benefits our understanding of the color variation mechanisms of the wing scales, and provides inspiration for further studies and applications.
关键词：
Shape control of multi-cellular inflatable panels
N. KATAYAMA, K. ISHIMURA, K. MINESUGI, DANIEL J. INMAN
《机械工程前沿（英文）》 2013年 第8卷 第3期 页码 276-282 doi: 10.1007/s11465-013-0267-5
Multi-cellular inflatable structures are ultra-light and robust against membrane damage such as pinholes caused by space debris. Due to their robustness, inflatable structures supported by inner gases can be applied as space structures. In the present study, shape control for a simple multi-cellular inflatable panel was achieved via a novel diaphragm mechanism. When the bending actuator in a center membrane bends, the inner pressures of sub-cells become different, and the diaphragm mechanism bends as a whole. Because a sliding component is not included, this deformable system is a reliable mechanism. In addition, the proposed mechanism has higher rigidity than that of a bending actuator used alone. In the present paper, we investigate the feasibility of a novel diaphragm mechanism and its characteristics using experimental and numerical results.
关键词： Membrane structures inflatable structure shape control smart structures structural mechanics space engineering
傅洪亮,酆广增
《中国工程科学》 2006年 第8卷 第2期 页码 34-38
提出了智能天线多载波CDMA系统中一种空域和频域联合的盲多用户自适应检测算法，它是将空域波束形成和频域合并检测合二为一，使得检测器在空域和频域两维上同时优化，从而提高了系统的检测性能。对这种空频联合检测算法的误码性能进行了分析,并与先自适应波束形成然后再进行频域合并的分步算法进行了仿真比较，仿真结果表明，提出的空频联合盲多用户自适应检测算法的检测性能优于分步检测算法。
A discussion of objective function representation methods in global optimization
Panos M. PARDALOS, Mahdi FATHI
《工程管理前沿（英文）》 2018年 第5卷 第4期 页码 515-523 doi: 10.15302/J-FEM-2018044
Non-convex optimization can be found in several smart manufacturing systems. This paper presents a short review on global optimization (GO) methods. We examine decomposition techniques and classify GO problems on the basis of objective function representation and decomposition techniques. We then explain Kolmogorov’s superposition and its application in GO. Finally, we conclude the paper by exploring the importance of objective function representation in integrated artificial intelligence, optimization, and decision support systems in smart manufacturing and Industry 4.0.
关键词： global optimization decomposition techniques multi-objective DC programming Kolmogorov’s superposition space-filling curve smart manufacturing and Industry 4.0
Hierarchical fractal structure of perfect single-layer graphene
T. Zhang, K. Ding
《机械工程前沿（英文）》 2013年 第8卷 第4期 页码 371-382 doi: 10.1007/s11465-013-0279-1
The atomic lattice structure of perfect single-layer graphene that can actually be regarded as a kind of hierarchical fractal structure from the perspective of fractal geometry was studied for the first time. Three novel and special discoveries on hierarchical fractal structure and sets were unveiled upon examination of the regular crystal lattices of the single-layer graphene. The interior fractal-type structure was discovered to be the fifth space-filling curve from physical realm. Two efficient methods for calculating the fractal dimension of this fresh member was also provided. The outer boundary curve had a fractal dimension equal to one, and a multi-fractal structure from a naturally existing material was found for the first time. A series of strict self-similar hexagons comprised a rotating fractal set. These hexagons slewed at a constant counterclockwise angle of 19.1° when observed from one level to the next higher level. From the perspective of fractal geometry, these pioneering discoveries added three new members to the existing regular fractal structures and sets. A fundamental example of a multi-fractal structure was also presented.
关键词： hierarchical fractal structure fractal dimension the fifth space-filling curve multi-fractal structure
The “Tiangong” Chinese Space Station project
Yang HONG
《工程管理前沿（英文）》 2018年 第5卷 第2期 页码 278-283 doi: 10.15302/J-FEM-2018202
关键词： manned space station space station project basic design
固态照明系统中颜色维持率的研究进展 Review
Maryam Yazdan Mehr, Willem Dirk van Driel, 张国旗
《工程（英文）》 2015年 第1卷 第2期 页码 170-178 doi: 10.15302/J-ENG-2015035
本文全面回顾了固态照明 (SSL) 系统中颜色维持率 (也称颜色漂移) 的研究进展。首先介绍了颜色漂移及实际生产工艺中的颜色漂移实例，然后阐释了固态照明系统中不同部分的老化机制。通过对LED 产品中透镜/密封件所用的各种材料的介绍， 探讨了这些材料对颜色漂移的促进作用。本文还就行业对光通维持率的定义标准化、表征描述与预测所做的工作进行了简单的回顾。
关键词： LED，颜色漂移，光通量衰减，流明衰减
标题 作者 时间 类型 操作
Multi-color space threshold segmentation and self-learning k-NN algorithm for surge test EUT status
Jian HUANG,Gui-xiong LIU
期刊论文
A method to calculate working capacity space of multi-DOF manipulator and the application in excavating
Baochen WEI, Feng GAO
期刊论文
determining flame radiation fraction induced by interaction burning of tri-symmetric propane fires in open spacebased on weighted multi-point source model
Jie JI, Junrui DUAN, Huaxian WAN
期刊论文
Investigations on color variations of
Guanglan LIAO, Haibo ZUO, Xuan JIANG, Xuefeng YANG, Tielin SHI
期刊论文
Shape control of multi-cellular inflatable panels
N. KATAYAMA, K. ISHIMURA, K. MINESUGI, DANIEL J. INMAN
期刊论文
A discussion of objective function representation methods in global optimization
Panos M. PARDALOS, Mahdi FATHI
期刊论文
京公网安备 11010502051620号
