Research Article. A query oriented implementation of a topologic data structure for 3-dimensional vector maps

1994 ◽  
Vol 8 (3) ◽  
pp. 243-260 ◽  
Author(s):  
René Rikkers ◽  
Martien Molenaar ◽  
John Stuiver
Keyword(s):  
Data Structure ◽  
Dimensional Vector ◽  
3 Dimensional ◽  
Research Article ◽  
Vector Maps

scholarly journals New Formulas and Results for 3-Dimensional Vector Fields

2021 ◽  
Vol 12 (11) ◽  
pp. 1058-1096
Author(s):  
Sadanand D. Agashe
Keyword(s):  
Vector Fields ◽  
Dimensional Vector ◽  
3 Dimensional

Research on Lossless Digital Watermarking Algorithm on Digital Vector Maps

2011 ◽  
Vol 268-270 ◽  
pp. 1132-1137
Author(s):  
Cheng Huang ◽  
Rong Dai
Keyword(s):  
Data Structure ◽  
Digital Watermarking ◽  
Clustering Analysis ◽  
Location Information ◽  
Vector Maps ◽  
File Structure ◽  
Attribute Information

Lossless digital watermarking algorithm based on attribute information has been presented based on the location information and coordinate information of vertex in vector maps. With the knowledge of data structure and file structure of digital vector maps, its attribute information has been presented in detail and a lossless scheme with zero-bit dynamical extension has been proposed. On the basis of this, space clustering analysis with grid density was used to increase robustness of the scheme.

Fiducial Registration With Spoiled Gradient-Echo Magnetic Resonance Imaging Enhances the Accuracy of Subthalamic Nucleus Targeting

Neurosurgery ◽  
2011 ◽  
Vol 69 (4) ◽  
pp. 870-875 ◽  
Author(s):  
Sharona Ben-Haim ◽  
Yakov Gologorsky ◽  
Ann Monahan ◽  
Donald Weisz ◽  
Ron L Alterman
Keyword(s):  
Dimensional Vector ◽  
Microelectrode Recording ◽  
Resonance Imaging ◽  
Gradient Echo ◽  
3 Dimensional ◽  
Vector Difference ◽  
Group 2 ◽  
Spoiled Gradient Echo ◽  
Deep Brain ◽  
Group 1

Abstract BACKGROUND: A variety of imaging strategies may be used to derive reliable stereotactic coordinates when performing deep brain stimulation lead implants. No single technique has yet proved optimal. OBJECTIVE: To compare the relative accuracy of stereotactic coordinates for the subthalamic nucleus (STN) derived either from fast spin echo/inversion recovery (FSE/IR) magnetic resonance imaging MRI alone (group 1) or FSE/IR in conjunction with T1-weighted spoiled gradient-echo MRI (group 2). METHODS: A retrospective analysis of 145 consecutive STN deep brain stimulation lead placements (group 1, n = 72; group 2, n = 73) was performed in 81 Parkinson disease patients by 1 surgical team. From the operative reports, we recorded the number of microelectrode recording trajectories required to localize the desired STN target and the span of STN traversed along the implantation trajectory. In addition, we calculated the 3-dimensional vector difference between the initial MRI-derived coordinates and the final physiologically refined coordinates. RESULTS: The proportion of implants completed with just 1 microelectrode recording trajectory was greater (81% vs 58%; P < .001) and the 3-dimensional vector difference between the anatomically selected target and the microelectrode recording–refined target was smaller (0.6 ± 1.2 vs 0.9 ± 1.3; P = .04) in group 2 than in group 1. At the same time, the mean expanse of STN recorded along the implantation trajectory was 8% greater in group 2 (4.8 ± 0.6 vs 5.2 ± 0.6 mm; P < .001). CONCLUSION: A combination of stereotactic FSE/IR and spoiled gradient-echo MRI yields more accurate coordinates for the STN than FSE/IR MRI alone.

scholarly journals Eeloscope—Towards a Novel Endoscopic System Enabling Digital Aircraft Fuel Tank Maintenance

Aerospace ◽  
2021 ◽  
Vol 8 (5) ◽  
pp. 136
Author(s):  
Florian Heilemann ◽  
Alireza Dadashi ◽  
Kai Wicke
Keyword(s):  
Design Thinking ◽  
Working Environment ◽  
Aircraft Wing ◽  
3 Dimensional ◽  
Research Article ◽  
Aircraft Fuel ◽  
Fuel Tanks ◽  
Inspection Data ◽  
Structural Inspection ◽  
Work Relief

In this research article, a novel endoscopic system, which is suited to perform a digital inspection of the aircraft wing fuel tanks, is introduced. The aim of this work is to specifically design and develop an assisting system, called `Eeloscope’, to allow accessing and diving through an aircraft kerosene tank in a minimally invasive matter. Currently, mechanics often suffer from the harsh working environment and the arduous maintenance duties within the tank. To address such challenges and derive a tailored solution, an adapted Design Thinking (DT) process is applied. The resulting system enables a fully digital inspection and generation of 3-dimensional structural inspection data. Consequently, devices such as the Eeloscope will facilitate a more efficient and continuous inspection of fuel tanks to increase the transparency regarding the condition of hardly accessible aircraft structures and provide a work relief for mechanics at the same time.

114 Development of 3-dimensional vector input equipment

2004 ◽  
Vol 2004.79 (0) ◽  
pp. _1-25_-_1-26_
Author(s):  
Toshinobu KIMURA ◽  
Satoru IWATA ◽  
Keizo AWA ◽  
Takuzou IWATUBO
Keyword(s):  
Dimensional Vector ◽  
3 Dimensional
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