scholarly journals Star Identification Algorithm Based on Oriented Singular Value Feature and Reliability Evaluation Method

2019 ◽  
Vol 62 (5) ◽  
pp. 265-274 ◽  
Author(s):  
Xin WEI ◽  
Desheng WEN ◽  
Zongxi SONG ◽  
Jiangbo XI
Keyword(s):  
Evaluation Method ◽  
Reliability Evaluation ◽  
Singular Value ◽  
Identification Algorithm ◽  
Star Identification

Operation reliability evaluation of cutting tools based on singular value decomposition transform and support vector space

2018 ◽  
Vol 233 (2) ◽  
pp. 175-185
Author(s):  
Baojia Chen ◽  
Baoming Shen ◽  
Fajun Zhang ◽  
Wenrong Xiao ◽  
Fafa Chen ◽  
...  
Keyword(s):  
Singular Value Decomposition ◽  
Dimensionality Reduction ◽  
Vector Space ◽  
Evaluation Method ◽  
Cutting Tools ◽  
Reliability Evaluation ◽  
Singular Value ◽  
Relative Distance ◽  
Support Vector ◽  
Value Decomposition

The traditional reliability evaluation method based on large sample statistics is inefficient for a single or a small batch computer numerical control turning cutting tool due to the inadequate description of time, dynamic process, inaccurate model and individualization. To solve the problem, a new operation reliability evaluation method based on singular value decomposition transform and support vector space is proposed. In this new method, the singular value decomposition is used for the dimensionality reduction of high-dimensional feature data so as to reduce the computational complexity and the redundant components. The hypersphere space of the similar data is established based on the dimension reduction data. The relative distance between the sample points and the hypersphere is then calculated and used to describe the performance of the tool. The semi-normal function is introduced to define the mapping relationship of the relative distance and the operation reliability of the tool. Finally, two cutting tools in the experiment are taken as the research example to verify the effectiveness of the method. The result shows that this method can evaluate the operation reliability of the tool effectively and the singular value decomposition dimensionality reduction improves the accuracy of the evaluation. It provides a new theoretical and practical support for the reliability evaluation of small sample data.

Robust Test Method of TSOP PEMs for Space Application

2019 ◽  
Author(s):  
Yasunobu Iwai ◽  
Koichi Shinozaki ◽  
Daiki Tanaka
Keyword(s):  
Evaluation Method ◽  
Low Cost ◽  
Reliability Evaluation ◽  
Test Method ◽  
Thermal Shock Test ◽  
Space Application ◽  
Space Applications ◽  
Limit Test ◽  
Long Time ◽  
Short Time

Abstract Compared with space parts, consumer parts are highly functional, low cost, compact and lightweight. Therefore, their increased usage in space applications is expected. Prior testing and evaluation on space applicability are necessary because consumer parts do not have quality guarantees for space application [1]. However, in the conventional reliability evaluation method, the test takes a long time, and the problem is that the robustness of the target sample can’t be evaluated in a short time. In this report, we apply to the latest TSOP PEM (Thin Small Outline Package Plastic Encapsulated Microcircuit) an evaluation method that combines preconditioning and HALT (Highly Accelerated Limit Test), which is a test method that causes failures in a short time under very severe environmental conditions. We show that this method can evaluate the robustness of TSOP PEMs including solder connections in a short time. In addition, the validity of this evaluation method for TSOP PEM is shown by comparing with the evaluation results of thermal shock test and life test, which are conventional reliability evaluation methods.

Research on Reliability Evaluation Methods of Distribution System

2014 ◽  
Vol 672-674 ◽  
pp. 1441-1446 ◽  
Author(s):  
Yu Qiang Ou ◽  
Le Feng Cheng ◽  
Jian Zhong Wen ◽  
Xuan Yu Qiu ◽  
Tao Yu
Keyword(s):  
Distribution System ◽  
Evaluation Method ◽  
Network Reliability ◽  
Distribution Network ◽  
Reliability Evaluation ◽  
Evaluation Indexes ◽  
Specific Distribution ◽  
And Function ◽  
Meaning And Function

Research on reliability of distribution network has very important meaning and function to ensure the quality of power supply. This paper introduces some basic concepts of reliability in distribution network, including distribution network reliability definition, task and index. The classical reliability evaluation method was reviewed, and focused on specific distribution network, an example analysis was given, and specific reliability evaluation indexes were calculated. Finally, the future development of distribution network reliability evaluation was made a simple prospect.

STAR IDENTIFICATION ALGORITHM FOR UNCALIBRATED, WIDE FOV CAMERAS

2015 ◽  
Vol 149 (6) ◽  
pp. 182 ◽  
Author(s):  
Mohamad Javad Ajdadi ◽  
Mahdi Ghafarzadeh ◽  
Mojtaba Taheri ◽  
Ehsan Mosadeq ◽  
Mahdi Khakian Ghomi
Keyword(s):  
Identification Algorithm ◽  
Star Identification ◽  
Wide Fov
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