中国科学院机构知识库网格系统: 检索

Network growth dynamics: The simultaneous interaction between network positions and research performance of collaborative organisations 期刊论文 OAI收割
TECHNOVATION, 2022, 卷号: 115
作者: Zhang, Yi; Chen, Kaihua

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收藏 | 浏览/下载：6/0 | 提交时间：2023/05/30

Network position Research performance Bidirectional relationship Inter-organisational research collaboration ego-network Cognitive proximity

Identification of the relationship between chinese adiantum reniforme var. sinense and canary adiantum reniforme 期刊论文 iSwitch采集
Bmc plant biology, 2015, 卷号: 15, 期号: 1
作者: Wang,Ai-Hua; Sun,Ye; Schneider,Harald

收藏 | 浏览/下载：30/0 | 提交时间：2019/05/09

Chromosome numbers Cpdna Flow cytometry Molecular clock dating Morphological characters Phylogenetic position Relationship identification Sem observation

Morphometric Characterization and Reconstruction Effect Among Lunar Impact Craters SCI/SSCI论文 OAI收割
2014
作者: Wang J.; Wang J.

收藏 | 浏览/下载：19/0 | 提交时间：2014/12/24

Morphometric characterization Position relationship Relative construction age Chang'E-1 change-1 moon

Trophic fingerprint of fish communities in subtropical floodplain lakes 期刊论文 OAI收割
ECOLOGY OF FRESHWATER FISH, 2013, 卷号: 22, 期号: 2, 页码: 246-256
作者: Zhang, Huan; Zhang, Huan; Wu, Gongguo; Zhang, Peiyu

收藏 | 浏览/下载：24/0 | 提交时间：2013/10/31

trophic position stable isotope dietary fish benthic omnivory habitat coupling feeding guild trophic relationship

Ligand-Based Structural Optimization of Grb2-SH2 Inhibitors: High Affinity, Low Charge and Reduced Peptidic Nature 期刊论文 OAI收割
CHINESE JOURNAL OF ORGANIC CHEMISTRY, 2011, 卷号: 31, 期号: 12, 页码: 2019-2033
作者: Peng Dian; Zhi Ying; Xue Ting; Gao Huiyuan; Long Yaqiu

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收藏 | 浏览/下载：15/0 | 提交时间：2021/07/23

STRUCTURE-BASED DESIGN RING-CLOSING METATHESIS SH2 DOMAIN NONPHOSPHORYLATED INHIBITOR PHOSPHOTYROSYL MIMETICS ACID-RESIDUES BINDING ANTAGONISTS POSITION REQUIREMENTS phosphotyrosine Grb2-SH2 inhibitor structure-activity relationship mitogenic ras pathway anti-tumor drug

Design of real-time small target detection system for infrared image based on FPGA (EI CONFERENCE) 会议论文 OAI收割
2010 International Conference on Optics, Photonics and Energy Engineering, OPEE 2010, May 10, 2010 - May 11, 2010, Wuhan, China
作者: Liu J.; Sun Q.; Wang J.; Ye X.; Xu H.

收藏 | 浏览/下载：26/0 | 提交时间：2013/03/25

A simple detection measurement is developed for realtime small target detection in infrared background which can be easily available on FPGA. Basing on the difference between target and background a predictive background is generated via restraining the infrared background with median filter and then global threshold segmentation is used to residual image for further processing. Taking advantage of the relationship of targets in frames a comprehensive analysis of residual image is made and then the precise position of target is got by removing pseudo-objectives. Experiment results show that the method is simple to apply to hardware system improve the system's false alarm rate and meet the requirements of practical engineering. 2010 IEEE.

A study of automation recognition of bridge in SAR image (EI CONFERENCE) 会议论文 OAI收割
2010 International Conference on Computer, Mechatronics, Control and Electronic Engineering, CMCE 2010, August 24, 2010 - August 26, 2010, Changchun, China
作者: Zhang L.-P.

收藏 | 浏览/下载：21/0 | 提交时间：2013/03/25

According to river and bridge features in SAR (Synthetic Aperture Radar SAR) image as well as the position relationship between bridge and river the automatic recognition method of bridge is presented. First the gradient of an image is calculated by gradient operator in order to get the gradient image and river region is segmented by Fisher criterion. Then a doubtful bridge region is extracted by morphology method and segmented by Fisher criterion. Finally the bridge is recognized according to the features. Experimental results show that this method can automatically and rapidly recognize bridge. 2010 IEEE.

Mean shift tracking combining SIFT (EI CONFERENCE) 会议论文 OAI收割
2008 9th International Conference on Signal Processing, ICSP 2008, October 26, 2008 - October 29, 2008, Beijing, China
作者: Xue C.

收藏 | 浏览/下载：66/0 | 提交时间：2013/03/25

A novel visual tracking algorithm to cope with occlusion and scale variation is proposed. This method combines mean shift and SIFT algorithm to track object. SIFT algorithm is invariant to rotation translation and scale variation. But it is a timeconsuming algorithm. The wasting time is related to image size. So the proposed algorithm first adopts mean shift to initially locate object position then SIFT operator is used to detect features in object area and model area lastly the proposed method matches features in these two areas and calculates the relationship between them using affine transform. According to affine transform parameters the state of object can be adjusted in time. In order to reduce process time an improved feature matching algorithm is proposed in this paper. Experiments show that the proposed algorithm deals with occlusion successfully and can adjust object size in time. 2008 IEEE.

The effect on tolerance distributing of an off-axis three mirror anastigmatic optical system with wavefront coding technology (EI CONFERENCE) 会议论文 OAI收割
Optical System Alignment and Tolerancing II, August 10, 2008 - August 11, 2008, San Diego, CA, United states
作者: Yan F.; Zhang X.-J.; Yan F.

收藏 | 浏览/下载：35/0 | 提交时间：2013/03/25

The wavefront coding technology is known as a system-level technology which can extend the depth of focus of optical system by innovative optical design and image restoration. This technology can control misfocus related aberrations including misfocus astigmatism and Petzval curvature temperature-related misfocus in digital imaging systems. It can also help optical system tolerate more residual error in optical manufacturing and alignment besides misfocus. The brief introduction of wavefront coding technology and the wavefront coded TMA system under research is presented respectively in part 1 and part 2. The "MTF similarity" is defined to describe the relationship among MTF at different position or different fields in the third part. It is also shown in this part that the MTF similarity of wavefront coded system is much higher than the normal system within a large range. In part 4 comparison between the origin system and the new system with wavefront coding technology is provided after multiple errors are introduced from which it can be observed that the system with wavefront coding technology can tolerate much bigger error than origin system. The error tolerance is re-distributed according to a new criterion based on MTF similarity. If the MTF similarity is less than a certain value it can be regarded that the system can tolerate the residual error. The new error tolerance is displayed and it is shown that the wavefront coding technology can also loosen the error distributing besides extended the depth of focus.

Study of high precision non-contact measurement based on CCD (EI CONFERENCE) 会议论文 OAI收割
4th International Conference on Information Technology and Applications, ICITA 2007, January 15, 2007 - January 18, 2007, Harbin, China
Lin L.; Yun F.

收藏 | 浏览/下载：22/0 | 提交时间：2013/03/25

In this paper a method that measures relatively positionrelationshipquickly and accurately between two vehicles both on a horizontal plane is introduced. When the linear CCD camera placed on the end of manipulator scans two point targets located on the other vehicle by virtue of the spatial intersection principle and trigonometry theorem the relative position relationship between the loading vehicles and launching ones can be gotten(i.e. the spatial coordinate parameters of x y z and the angle displacement ). At the same time the paper establishes that the measurement error of length is less than 1mm by analysis of thee rror analysis and the simulation of computer. The angle displacement is less than 3 which satisfies the technical requests. So the vehicle orientation and loading missiles can be both done at the shortest time. It meets the demand of centralization between the measurement and execution. Forboth automatic transshipment and spatial position relationship measurement the study is valuable. And the manipulator is measure device as well as executive one so that residual inherent error decreases according to identical reference principle. Therefore the measure precision can be improved greatly.