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Research Developments and Prospects on Microseismic Source Location in Mines Review
Jiulong Cheng,Guangdong Song,Xiaoyun Sun,Laifu Wen,Fei Li
Engineering 2018, Volume 4, Issue 5, Pages 653-660 doi: 10.1016/j.eng.2018.08.004
Microseismic source location is the essential factor in microseismic monitoring technology, and its location precision has a large impact on the performance of the technique. Here, we discuss the problem of low-precision location identification for microseismic events in a mine, as may be obtained using conventional location methods that are based on arrival time. In this paper, microseismic location characteristics in mining are analyzed according to the characteristics of the mine's microseismic wavefield. We review research progress in mine-related microseismic source location methods in recent years, including the combination of the Geiger method with the linear method, combined microseismic event location method, optimization of relative location method, location method without pre-measured velocity, and location method without arrival time picking. The advantages and disadvantages of these methods are discussed, along with their feasible conditions. The influences of geophone distribution, first arrival time picking, and the velocity model on microseismic source location are analyzed, and measures are proposed to influence these factors. Approaches to solve the problem under study include adopting information fusion, combining and optimizing existing methods, and creating new methods to realize highprecision microseismic source location. Optimization of the velocity structure, along with applications of the time-reversal imaging technique, passive time-reversal mirror, and relative interferometric imaging, are expected to greatly improve microseismic location precision in mines. This paper also discusses the potential application of information fusion and deep learning methods in microseismic source location in mines. These new and innovative location methods for microseismic source location have extensive prospects for development.
Keywords： Microseismic source location Influencing factors Time-reversal imaging Research progress Prospects for development
Velocity-Free MS/AE Source Location Method for Three-Dimensional Hole-Containing Structures Article
Longjun Dong, Qingchun Hu, Xiaojie Tong, Youfang Liu
Engineering 2020, Volume 6, Issue 7, Pages 827-834 doi: 10.1016/j.eng.2019.12.016
Microseismic source/acoustic emission (MS/AE) localization method is crucial for predicting and controlling of potentially dangerous sources of complex structures. However, the locating errors induced by both the irregular structure and pre-measured velocity are poorly understood in existing methods. To meet the high-accuracy locating requirements in complex three-dimensional hole-containing structures, a velocity-free MS/AE source location method is developed in this paper. It avoids manual repetitive training by using equidistant grid points to search the path, which introduces A* search algorithm and uses grid points to accommodate complex structures with irregular holes. It also takes advantage of the velocity-free source location method. To verify the validity of the proposed method, lead-breaking tests were performed on a cubic concrete test specimen with a size of 10 cm × 10 cm × 10 cm. It was cut out into a cylindrical empty space with a size of ϕ6cm × 10 cm. Based on the arrivals, the classical Geiger method and the proposed method are used to locate lead-breaking sources. Results show that the locating error of the proposed method is 1.20 cm, which is less than 2.02 cm of the Geiger method. Hence, the proposed method can effectively locate sources in the complex three-dimensional structure with holes and achieve higher precision requirements.
Studies on Precise Spacecraft Navigation and Positioning Using GPS
Xiang Kaiheng,Qu Guangji
Strategic Study of CAE 2004, Volume 6, Issue 1, Pages 86-91
In this paper, GPS measurement technology, Encke method to solve satellite orbit perturbation and generalized Kalman filtering technology are organically combined together, and an innovative solution— carrier phase & pseudorange integrated dynamic orbit determination (CPPIDOD) for low earth orbit spacecraft on-board autonomous precise navigation and positioning using GPS is presented. Difficult problems of dynamically resolving of integer ambiguities and amendment of cycle slips in the application of GPS carrier phase have been solved. Based on all these, technique of carrier phase & pseudorange integrated dynamic differential relative navigation between two spacecrafts is brought forward. Results of numerical simulation analyses and semi-physical simulation tests show that the solutions presented in this paper are feasible. They can significantly improve the performance of GPS positioning, and their models, algorithms and software are practical for engineering use.
Keywords： spacecraft navigation GPS carrier phase Kalman filtering
A Method for License Plate Localization based on Texture and Wavelet Analysis
Huang Wei,Lu Xiaobo,Yu Yanxiang,Ling Xiaojing
Strategic Study of CAE 2004, Volume 6, Issue 3, Pages 19-24
This paper presents a method for vehicle license plate localization using texture and wavelet analysis. In view of the complex background and the small ratio of the license plate area to the whole picture, a method for finding a threshold for primitive classification is proposed. According to the distribution regularities of the characters in the license plate, a binary texture primitive analysis method is presented to extract the candidate license plate areas. A feature of the vertical strokes in the license plate is extracted using wavelet analysis. The feature of the vertical strokes, position feature and shape feature are quantificationally evaluated using membership degree, and a method for selecting the license plate area from the candidates by integrating all the features is described. A test shows that the proposed method offers a localization correctness rate of higher than 96% .
Keywords： texture wavelet analysis primitive license plate localization
A Survey of the Observability for Single Observer Passive Location
Deng Xinpu
Strategic Study of CAE 2007, Volume 9, Issue 11, Pages 54-62
A basic requirement for passive state estimation using single observer is the existence of a unique tracking solution. This leads to the question of observability. The target state is observable over the time interval if, and only if, it is uniquely determined by the measurements taken in that interval. In this paper, the state-observability problem for passive target tracking by angle measurements is analyzed using three methods: the geometrical method, the elementary algebraic method and linear system method. The observability for target tracking with frequency measurements is also analyzed. Degree of observability is discussed. And a concise review of papers on observability analysis is presented.
Keywords： passive location TMA observability
Use microseismic monitoring to forecast hazardous earthquake of water reservoirs and mines
Liu Jianzhong,Liu Guohua
Strategic Study of CAE 2012, Volume 14, Issue 4, Pages 45-48
This paper discusses the use of microseismic monitoring for water reservoir and mines in hazardous earthquake forecasting. Author deems that monitoring expanded to microseismic level can enlarge database and improve credibility of prediction. Actual results of microseismic monitoring underlies such expansion. With advancement of technology and earthquake forecasting principles, microseismic monitoring can achieve breakthrough in hazardous quake forecasting of water reservoirs and mines.
Keywords： reservoir mine earthquake disaster hypocenter
What if the Global Positioning System Didn’t Work?
Mitch Leslie
Engineering 2019, Volume 5, Issue 6, Pages 985-986 doi: 10.1016/j.eng.2019.10.007
Influence of Rigidity of Feed System With Ball Screw in NC Lathe on Positioning Precision
Wu Nanxing,Hu Rufu,Sun Qinghong
Strategic Study of CAE 2004, Volume 6, Issue 9, Pages 46-49
Rigidity of feed system with ball screw in NC lathe has a major influence on loss of momentum and positioning precision. Based on the spring mechanics model and the quality of the feed system, the analytic formulation for the effect of the transition and torsion rigidity of the feed system on the loss of momentum have been given. The analytic formulation for position error have been given, too. Theoretic basis for designing the structure, reducing loss of momentum and increasing positioning precision of feed system has been provided. Moreover, analysis and calculation have been made in combination with an actual example, and significant effect has been obtained.
Keywords： NC lathe rigidity loss of momentum positioning precision
Xia Jiahui
Strategic Study of CAE 2000, Volume 2, Issue 11, Pages 1-11
In this paper, the study on family collection, gene mapping, gene identification and gene function of human genetic diseases carried out in the National Laboratory of Medical Genetics of China, were described in detail. Using G-banding technique a marker chromosome t (1; 3) (q44; p11) associated with nasopharyngeal cancer was found in 1975 at first, and human TDF gene was mapped to chromosome Yp11. 32 in 1981. Since 1991, 590 families with 345 kind of genetic diseases were collected. In 1998, GJB3, a human genetic neurological deafness gene, was identified using a novel strategy of “Gene Family-Candidate Disease Gene Cloning”，and the paper was published in Nature Genetics (20： 370). In 1999, by linkage analysis and Genome Wide Scanning, a locus responsible for disseminated superficial actinic porokeratosis (DSAP) was identified at Chromosome 12q23. 2 - 24. 1; and at the same year a novel protein trafficking gene was also cloned from gene function study.
Keywords： genetic disease gene mapping and cloning gene familiy-candidate disease gene cloning genome wide scan gene function study
Wei Zhang,Xiaoli Yang,Jingjing Song,Xin Zheng,Jianbo Chen,Panpan Ma,Bangzhi Zhang,Rui Wang
Engineering 2015, Volume 1, Issue 4, Pages 500-505 doi: 10.15302/J-ENG-2015106
The emergence of multidrug-resistant bacteria creates an urgent need for alternative antibiotics with new mechanisms of action. In this study, we synthesized a novel type of antimicrobial agent, Acr3-NLS, by conjugating hydrophobic acridines to the N-terminus of a nuclear localization sequence (NLS), a short cationic peptide. To further improve the antimicrobial activity of our agent, dimeric (Acr3-NLS)2 was simultaneously synthesized by joining two monomeric Acr3-NLS together via a disulfide linker. Our results show that Acr3-NLS and especially (Acr3-NLS)2 display significant antimicrobial activity against gram-negative and gram-positive bacteria compared to that of the NLS. Subsequently, the results derived from the study on the mechanism of action demonstrate that Acr3-NLS and (Acr3-NLS)2 can kill bacteria by membrane disruption and DNA binding. The double targets–cell membrane and intracellular DNA–will reduce the risk of bacteria developing resistance to Acr3-NLS and (Acr3-NLS)2. Overall, this study provides a novel strategy to design highly effective antimicrobial agents with a dual mode of action for infection treatment.
Keywords： acridine nuclear localization sequence conjugate antimicrobial activity mechanism of action
A Fault Location Approach for the Testable Realization of Logic Functions
Pan Zhongliang
Strategic Study of CAE 2002, Volume 4, Issue 1, Pages 69-74
An approach of design for testability(DFT) for logic functions is presented in the paper, which employs AND gates and XOR gates tree to realize the generalized Reed-Muller expression of arbitrary logic functions. The major features of the approach are： 1) The circuits adopting the DPT techniques in the paper are totally fault locatable. 2) The circuits have universal test sets for fault detection, the cardinality of the test sets is (n + 5), where n is equal to the number of input variables in the logic function. A fault location method for the circuits is presented, which can identify all fault equivalence classes in the AND gates, and the faults in XOR gate tree in the circuits.
Keywords： logic functions Reed-Muller expressions design for testability single stuck at fault faults location
Mina Fahimipirehgalin, Emanuel Trunzer, Matthias Odenweller, Birgit Vogel-Heuser
Engineering 2021, Volume 7, Issue 6, Pages 758-776 doi: 10.1016/j.eng.2020.08.026
Liquid leakage from pipelines is a critical issue in large-scale process plants. Damage in pipelines affects the normal operation of the plant and increases maintenance costs. Furthermore, it causes unsafe and hazardous situations for operators. Therefore, the detection and localization of leakages is a crucial task for maintenance and condition monitoring. Recently, the use of infrared (IR) cameras was found to be a promising approach for leakage detection in large-scale plants. IR cameras can capture leaking liquid if it has a higher (or lower) temperature than its surroundings. In this paper, a method based on IR video data and machine vision techniques is proposed to detect and localize liquid leakages in a chemical process plant. Since the proposed method is a vision-based method and does not consider the physical properties of the leaking liquid, it is applicable for any type of liquid leakage (i.e., water, oil, etc.). In this method, subsequent frames are subtracted and divided into blocks. Then, principle component analysis is performed in each block to extract features from the blocks. All subtracted frames within the blocks are individually transferred to feature vectors, which are used as a basis for classifying the blocks. The k-nearest neighbor algorithm is used to classify the blocks as normal (without leakage) or anomalous (with leakage). Finally, the positions of the leakages are determined in each anomalous block. In order to evaluate the approach, two datasets with two different formats, consisting of video footage of a laboratory demonstrator plant captured by an IR camera, are considered. The results show that the proposed method is a promising approach to detect and localize leakages from pipelines using IR videos. The proposed method has high accuracy and a reasonable detection time for leakage detection. The possibility of extending the proposed method to a real industrial plant and the limitations of this method are discussed at the end.
Keywords： Leakage detection and localization Image analysis Image pre-processing Principle component analysis k-nearest neighbor classification
Energy-efficient localization and target tracking via underwater mobile sensor networks None
Hua-yan CHEN, Mei-qin LIU, Sen-lin ZHANG
Frontiers of Information Technology & Electronic Engineering 2018, Volume 19, Issue 8, Pages 999-1012 doi: 10.1631/FITEE.1700598
Keywords： Underwater mobile sensor networks Energy-efficient Sensor localization Target tracking
Geolocation method of HY-2 satellite microwave radiometer
Wu Kuiqiao,Lin Mingsen,Guo Zhenyu
Strategic Study of CAE 2014, Volume 16, Issue 6, Pages 21-26
Using cone scanning method, microwave radiometer of HY-2 satellite measures the SST and the atmosphere of the earth. This article represents one geolocation method applied to the microwave radiometer of HY-2 satellite according to the geometry model. The image of microwave radiometer was geolocationed with this method, and the result was evaluated at last.
Keywords： HY-2 satellite geolocation coordinate system
A performance analysis of multi-satellite joint geolocation Article
Ding WANG,Shuai WEI,Ying WU
Frontiers of Information Technology & Electronic Engineering 2016, Volume 17, Issue 12, Pages 1360-1387 doi: 10.1631/FITEE.1500285
Keywords： Satellite geolocation Time difference of arrival (TDOA) Cramer-Rao bound (CRB) Calibration sources Performance analysis
Title Author Date Type Operation
Research Developments and Prospects on Microseismic Source Location in Mines
Jiulong Cheng,Guangdong Song,Xiaoyun Sun,Laifu Wen,Fei Li
Journal Article
Velocity-Free MS/AE Source Location Method for Three-Dimensional Hole-Containing Structures
Longjun Dong, Qingchun Hu, Xiaojie Tong, Youfang Liu
Journal Article
Studies on Precise Spacecraft Navigation and Positioning Using GPS
Xiang Kaiheng,Qu Guangji
Journal Article
A Method for License Plate Localization based on Texture and Wavelet Analysis
Huang Wei,Lu Xiaobo,Yu Yanxiang,Ling Xiaojing
Journal Article
Use microseismic monitoring to forecast hazardous earthquake of water reservoirs and mines
Liu Jianzhong,Liu Guohua
Journal Article
Influence of Rigidity of Feed System With Ball Screw in NC Lathe on Positioning Precision
Wu Nanxing,Hu Rufu,Sun Qinghong
Journal Article
Study on Family Collection, Gene Mapping, Gene Identification and Gene Function of Human Genetic Diseases
Xia Jiahui
Journal Article
Conjugation with Acridines Turns Nuclear Localization Sequence into Highly Active Antimicrobial Peptide
Wei Zhang,Xiaoli Yang,Jingjing Song,Xin Zheng,Jianbo Chen,Panpan Ma,Bangzhi Zhang,Rui Wang
Journal Article
A Fault Location Approach for the Testable Realization of Logic Functions
Pan Zhongliang
Journal Article
Automatic Visual Leakage Detection and Localization from Pipelines in Chemical Process Plants Using Machine Vision Techniques
Mina Fahimipirehgalin, Emanuel Trunzer, Matthias Odenweller, Birgit Vogel-Heuser
Journal Article
Energy-efficient localization and target tracking via underwater mobile sensor networks
Hua-yan CHEN, Mei-qin LIU, Sen-lin ZHANG
Journal Article
Geolocation method of HY-2 satellite microwave radiometer
Wu Kuiqiao,Lin Mingsen,Guo Zhenyu
Journal Article
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