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长春光学精密机械与物... [4]
数学与系统科学研究院 [2]
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OAI收割 [6]
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会议论文 [4]
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The Asymptotic Behavior of Bootstrap Support Values in Molecular Phylogenetics
期刊论文
OAI收割
SYSTEMATIC BIOLOGY, 2021, 卷号: 70, 期号: 4, 页码: 774-785
作者:
Huang, Jun
;
Liu, Yuting
;
Zhu, Tianqi
;
Yang, Ziheng
  |  
收藏
  |  
浏览/下载:40/0
  |  
提交时间:2021/10/26
Bootstrap
model selection
star-tree paradox
support value
Robust Novelty Detection via Worst Case CVaR Minimization
期刊论文
OAI收割
IEEE TRANSACTIONS ON NEURAL NETWORKS AND LEARNING SYSTEMS, 2015, 卷号: 26, 期号: 9, 页码: 2098-2110
作者:
Wang, Yongqiao
;
Dang, Chuangyin
;
Wang, Shouyang
  |  
收藏
  |  
浏览/下载:20/0
  |  
提交时间:2018/07/30
Conditional value-at-risk (CVaR)
kernel methods
novelty detection
robust programming
single-class support vector machine (SSVM)
Integrated context tacit knowledge manage model (EI CONFERENCE)
会议论文
OAI收割
2011 7th International Conference on Natural Computation, ICNC 2011, July 26, 2011 - July 28, 2011, Shanghai, China
作者:
Liu G.
;
Wang Y.-C.
;
Wang Y.-C.
收藏
  |  
浏览/下载:30/0
  |  
提交时间:2013/03/25
Aimed at solving the practical problem about the difficult in the acquirement
the transformation and the sharing of the tacit knowledge
this paper have constructed a integrated context tacit knowledge modelCTKM
and the paper is based on the conclusion that knowledge is the product of certain context
the value of the knowledge depends on its context. Firstly
the model described in this paper fulfills online knowledge mutual platform
and it provide a support for the sharing transmission of the knowledge and the collection of tacit knowledge and knowledge context elements. After that
the paper constructs a context management model to finish the design of context recognition acquisition scheme and problem-based context modeling. Lastly
on the basis of the context model the paper fulfill the acquisition the expression
the sharing and the storage in the tacit knowledge management. CTKM model provide a solution of the integrated context for the tacit knowledge management and through the load of context elements achieve the effective sharing of the tacit knowledge. 2011 IEEE.
Analysis of laser jamming to satellite-based detector (EI CONFERENCE)
会议论文
OAI收割
International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging, June 17, 2009 - June 19, 2009, Beijing, China
作者:
Guo L.-H.
;
Guo R.-H.
;
Wang S.-W.
收藏
  |  
浏览/下载:29/0
  |  
提交时间:2013/03/25
The reconnaissance satellite
communication satellite and navigation satellite used in the military applications have played more and more important role in the advanced technique wars and already become the significant support and aid system for military actions. With the development of all kinds of satellites
anti-satellite laser weapons emerge as the times require. The experiments and analyses of laser disturbing CCD (charge coupled detector) in near ground have been studied by many research groups
but their results are not suitable to the case that using laser disturbs the satellite-based detector. Because the distance between the satellite-based detector and the ground is very large
it is difficult to damage it directly. However the optical receive system of satellite detector has large optical gain
so laser disturbing satellite detector is possible. In order to determine its feasibility
the theoretical analyses and experimental study are carried out in the paper. Firstly
the influence factors of laser disturbing satellite detector are analyzed in detail
which including laser power density on the surface of the detector after long distance transmission
and laser power density threshold for disturbing etc. These factors are not only induced by the satellite orbit
but dependence on the following parameters: laser average power in the ground
laser beam quality
tracing and aiming precision and atmospheric transmission. A calculation model is developed by considering all factors which then the power density entering into the detector can be calculated. Secondly
the laser disturbing experiment is performed by using LD (laser diode) with the wavelength 808 nm disturbing CCD 5 kilometer away
which the disturbing threshold value is obtained as 3.5510-4mW/cm2 that coincides with other researcher's results. Finally
using the theoretical model
the energy density of laser on the photosensitive surface of MSTI-3 satellite detector is estimated as about 100mW/cm2
which is largely exceed the disturbing threshold and therefore verify the feasibility of using this kind of laser disturbing the satellite-based detector. According to the results. using the similar laser power density absolutely saturate the requirements to laser disturbing satellite-based detector. If considering the peak power of pulsed laser
even decrease laser average power
it is also possible to damage the detector. This result will provide the reliable evidences to evaluate the effect of laser disturbing satellite-based detector. 2009 SPIE.
Design and analysis of large spaceborne light-weighted primary mirror and its support system (EI CONFERENCE)
会议论文
OAI收割
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies, AOMATT 2007: Large Mirrors and Telescopes, July 8, 2007 - July 12, 2007, Chengdu, China
Yan Y.
;
Jin G.
;
Yang H.-B.
收藏
  |  
浏览/下载:16/0
  |  
提交时间:2013/03/25
With the development of the resolution of spaceborne remote sensor
the diameter of the primary mirror of spaceborne telescope becomes larger and larger. The distortion of primary mirror which is influenced by the mirror material
structure
self-weight
support system and temperature environment affects optical image quality finally. In this paper
an on-axis TMA high-resolution Cassegrain optical payload with a primary mirror whose diameter is 650mm was designed and the effects of the influence factors of the distortion acts on the on-axis TMA optical system primary mirror had been analyzed by means of Finite Element Analysis. During work
the technology of the primary mirror design had been summarized and general consideration of the primary mirror design technology also had been described at the same time. Considering the telescope manufacture and work station
a reasonable and optimal structure of the primary mirror sub-assembly is taken finally. In the end
the distortion of the primary mirror during its fabrication station and work station had been analyzed by integrated Finite Element Analysis Method. The results implicated the synthesis profile error (P-V value) for the primary mirror is less than /10 and all the indexes of the primary mirror satisfy the requirements of the optical system.
Support technique of ultra thin mirror in space optics (EI CONFERENCE)
会议论文
OAI收割
2nd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, November 2, 2005 - November 5, 2005, Xian, China
作者:
Ren J.-Y.
;
Gao M.-H.
收藏
  |  
浏览/下载:31/0
  |  
提交时间:2013/03/25
With the development of space optical system
the technique of ultra thin mirror come forth and is paid more attention because of less difficulty in machining
low cost
lightweight
no disassembly during detecting and maintaining. The key technique takes advantage of deformation of ultra thin mirror as the influence of environment to adjust the surface figure. Its accuracy meets requirement. An analysis method is based on finite element analysis (FEA)
and many items
including the amount of support points
the way of arrangement
the optimum design of support component are studied. The finite element method was used to analyze the mirror and some different mirror support schemes. The principal aim of the mirror analysis is to get numbers of support points and the ways of the support. There are three schemes including 12-6-1
12-8-1 and 16-8-1 models. Deformation of deadweight is calculated under the three conditions. The way of 16-8-1 is more suitable than the designs of other two. The support subassembly is amended to meet with the mirror surface RMS in the range of 30m. Deformation of the mirror with support structure has been calculated. The result is 16.52nm
lower than a quarter of the wavelength
which indicates the feasibility of the support scheme applied to mirror. Theoretical result for the best way of support is presented. The result of analysis shows that requirement surface figure could be met through adjusting support points. It predicts feasibility of the support technique and provides theoretical value for active adjustment in the laboratory. At present
support and adjusting experiment of ultra thin mirror is being carried on.