中国科学院机构知识库网格系统: 检索

Informing urban sustainability through cross-scale urban metabolism: Insights from Shanghai and the Yangtze River Delta 期刊论文 OAI收割
ENVIRONMENTAL IMPACT ASSESSMENT REVIEW, 2025, 卷号: 112, 页码: 107863
作者: Fan, Yupeng; Zhang, Chao; Fang, Chuanglin

|

收藏 | 浏览/下载：12/0 | 提交时间：2025/04/21

Urban system Sustainable urban development Complex system analysis Cross-scale urban metabolism Shanghai Urban sustainability

Seasonal Characteristics of Agricultural Product Circulation Network: A Case Study in Beijing, China 期刊论文 OAI收割
AGRONOMY-BASEL, 2022, 卷号: 12, 期号: 11, 页码: 16
作者: Zhao, Yibo; Cheng, Shifen; Lu, Feng

|

收藏 | 浏览/下载：41/0 | 提交时间：2023/01/09

agricultural product system circulation network multi-view spatiotemporal analysis trajectory data mining spatial interaction seasonality complex network

Seasonal Characteristics of Agricultural Product Circulation Network: A Case Study in Beijing, China 期刊论文 OAI收割
AGRONOMY-BASEL, 2022, 卷号: 12, 期号: 11, 页码: 16
作者: Zhao, Yibo; Cheng, Shifen; Lu, Feng

|

收藏 | 浏览/下载：27/0 | 提交时间：2023/01/09

agricultural product system circulation network multi-view spatiotemporal analysis trajectory data mining spatial interaction seasonality complex network

Global sensitivity analysis in hydrological modeling: Review of concepts, methods, theoretical framework, and applications SCI/SSCI论文 OAI收割
2015
作者: Song X. M.; Zhang, J. Y.; Zhan, C. S.; Xuan, Y. Q.; Ye, M.

收藏 | 浏览/下载：47/0 | 提交时间：2015/12/09

Global method Hydrological model Parameter optimization Sensitivity analysis Uncertainty analysis complex environmental-model distributed watershed models artificial neural-network groundwater-flow system rainfall-runoff models uncertainty analysis parameter sensitivity morris method identifiability analysis correlated parameters

Multi-scale recurrence analysis of complex temporal-spatial system 会议论文 OAI收割
Chinese Control Conference, CCC, Nanjing, China, 2014-07-28
作者: Deng LH(邓林华)

收藏 | 浏览/下载：14/0 | 提交时间：2016/04/06

Information Processing Time Series Analysis empirical mode decomposition Morlet Wavelet Transform Complex Control System

Research of ballistic missile early warning system (EI CONFERENCE) 会议论文 OAI收割
2nd International Conference on Advanced Engineering Materials and Technology, AEMT 2012, July 6, 2012 - July 8, 2012, Zhuhai, China
Zhang M.-H.; Zhang Y.-Y.

收藏 | 浏览/下载：34/0 | 提交时间：2013/03/25

To develop a lift early warning infrared device as a part of land or boat (ship) early warning system the system has the ability to target pre-discovery and instructions invasion. Methods: In support of distant air situation alerts the enemy aircraft missiles and other long-range goals obtain the target type and preliminary judgment of grade deliver the alarm information to the command system. The infrared alarm device detects the target's own infrared radiation passively alarms the incoming targets at low altitude and low altitude remote when radar and other equipment is out of work. Results: The accuracy of entire system reached 20 according the analysis. Conclusions: The device has a full range of complex background with high sensitivity high resolution anti-jamming fast response time and other characteristics. (2012) Trans Tech Publications Switzerland.

Research on infrared dim-point target detection and tracking under sea-sky-line complex background (EI CONFERENCE) 会议论文 OAI收割
International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Infrared Imaging and Applications, May 24, 2011 - May 24, 2011, Beijing, China
作者: Dong Y.-X.; Zhang H.-B.; Li Y.; Li Y.; Li Y.

收藏 | 浏览/下载：111/0 | 提交时间：2013/03/25

Target detection and tracking technology in infrared image is an important part of modern military defense system. Infrared dim-point targets detection and recognition under complex background is a difficulty and important strategic value and challenging research topic. The main objects that carrier-borne infrared vigilance system detected are sea-skimming aircrafts and missiles. Due to the characteristics of wide field of view of vigilance system the target is usually under the sea clutter. Detection and recognition of the target will be taken great difficulties.There are some traditional point target detection algorithms such as adaptive background prediction detecting method. When background has dispersion-decreasing structure the traditional target detection algorithms would be more useful. But when the background has large gray gradient such as sea-sky-line sea waves etc.The bigger false-alarm rate will be taken in these local area.It could not obtain satisfactory results. Because dim-point target itself does not have obvious geometry or texture feature in our opinion from the perspective of mathematics the detection of dim-point targets in image is about singular function analysis.And from the perspective image processing analysis the judgment of isolated singularity in the image is key problem. The foregoing points for dim-point targets detection its essence is a separation of target and background of different singularity characteristics.The image from infrared sensor usually accompanied by different kinds of noise. These external noises could be caused by the complicated background or from the sensor itself. The noise might affect target detection and tracking. Therefore the purpose of the image preprocessing is to reduce the effects from noise also to raise the SNR of image and to increase the contrast of target and background. According to the low sea-skimming infrared flying small target characteristics the median filter is used to eliminate noise improve signal-to-noise ratio then the multi-point multi-storey vertical Sobel algorithm will be used to detect the sea-sky-line so that we can segment sea and sky in the image. Finally using centroid tracking method to capture and trace target. This method has been successfully used to trace target under the sea-sky complex background. 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).

The reflector bracket mirror structure optimization and design of the IR warring system (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Advanced Engineering Materials and Technology, AEMT 2011, July 29, 2011 - July 31, 2011, Sanya, China
作者: Wang B.; Wang B.

收藏 | 浏览/下载：21/0 | 提交时间：2013/03/25

This paper introduced a kind of reflector mirror support structure of IRST system. Thescanning reflector mirror support frame material is Ly2 aluminum under the principle of the suited ofmaterial expanding quotient. The support form of the reflector was talked and the system bracketstructure was designed following the requests of the certain complex IRST. The bracket wasoptimized and analyzed under the best structure quality and the least moment of inertia and thebellowing of bracket plane thickness mode frequency restriction and deadweight restriction. Fromthe result we can see that the bracket mass can reduce from 0.73kg to 0.49kg and the moment ofinertia can reduce from 0.0109kg2 to 0.0056 kg2 under the first precondition of the structure modefrequency being low and the biggest transmogrification being teeny. The base frequency and intensionof the complex IRST system can be indicated well after the finite element analysis static checking. (2011) Trans Tech Publications Switzerland.

Signal processing for the annual runoff process By wavelet and R/S analysis: A case Study of the Tarim headwater basin 会议论文 OAI收割
9th International Conference on Signal Processing, ICSP, Beijing, China, 2008
Xu; Jianhua1; Chen; Yaning2; Li; Weihong2; Dong; Shan1

收藏 | 浏览/下载：28/0 | 提交时间：2011/08/23

Nonlinear systems - Rivers - Signal processing - Annual runoff - Annual runoff process - Complex nonlinear system - Headwater basins - Hurst exponents - Long-term correlations - Non-linear trends - R/S analysis - Tarim headwater basin - Tarim river - Time periods - Time-scale - Wavelet

Design of GPS/INS integrated navigation system based on multisensor information fusion (EI CONFERENCE) 会议论文 OAI收割
6th World Congress on Intelligent Control and Automation, WCICA 2006, June 21, 2006 - June 23, 2006, Dalian, China
Chunmei H.; Yantao T.; Wanxin S.; Mao L.

收藏 | 浏览/下载：38/0 | 提交时间：2013/03/25

Two kinds of design methods of GPS/INS integrated navigation system are presented that is GPS/INS integrative system and integrated navigation system based on information fusion. By analyzing mathematics model of the first system error we found that inertia velocity error would cause code loop track error. Consequently the pseudo range meterage error is interrelated with inertia velocity error which is complex to calculate. If this relativity is ignored in the state equation and observation equation of this system it must affect the estimated precision of the kalman filter and maybe the system is unstable. Therefore the second integrated navigation method is introduced. It adopts information fusion federal kalman filter and covariance. And consider the above pertinence to analyze the navigation performance of the integration system. Then it gives the flow of federal kalman filter algorithm. By analyzing the conclusion is that velocity error of integrated navigation system drops from 0.5m/s to below 0.05m/s and improves the precision and reliability of the navigation system effectively well continuity and real-time capability. It provides an effective way for data analysis and process of fusion navigation system. 2006 IEEE.