Storage Mechanism of Processing Magnanimity Small Files Applying HDFS Architecture

2013 ◽  
Vol 765-767 ◽  
pp. 1614-1617
Author(s):  
Wang Xin ◽  
Jun Ma
Keyword(s):  
Reading Time ◽  
New Method ◽  
Storage Mechanism ◽  
Application Architecture ◽  
Reading Efficiency ◽  
Low Efficiency

Pointing at the low efficiency problem of I/O operations of small files using HDFS application architecture, this article proposes a new method, that is, add disk buffer on DataNode to reduce addressing time of reading small files, and thus reduce reading time, and reduce the stress bringed by frequent NameNode access, so as to optimize the reading efficiency of small files. Experiment results show that the design programme is feasible, and adding disk buffer benefits for increasing efficiency of processing small files applying HDFS.

scholarly journals A New Method for Extracting Elevation Information of River System from Contours

2019 ◽  
Vol 2 ◽  
pp. 1-7
Author(s):  
Guifang He ◽  
Minshi Liu
Keyword(s):  
River Flow ◽  
Spatial Relationship ◽  
River System ◽  
New Method ◽  
River Section ◽  
Trend Surface ◽  
Existing Problems ◽  
Logical Error ◽  
Conventional Methods ◽  
Low Efficiency

<p><strong>Abstract.</strong> Considering the existing problems in methods of extracting elevation in river system, such as low efficiency, low accuracy, elevation logic errors and other issues, this paper proposes a new method of elevation extraction based on contours. Firstly, the spatial relationship between river system and contours is constructed to improve the intersection efficiency. Secondly, the accuracy of river system elevation can be improved and river flow logical error can be avoided by using the method of interpolation of trend surface of the river section. And then, the river tree is established to avoid the logical error of river system. Many comparison experiments about efficiency, elevation accuracy and elevation logical error between this method and other two conventional methods have been carried out, and the results show that both accuracy and efficiency can be improved and there is no logical error of elevation by this method.</p>

Topology Algorithm of Power Network Based on Breadth-First-Search

2014 ◽  
Vol 556-562 ◽  
pp. 4591-4595
Author(s):  
Lin Wei Li ◽  
Xing He Ma ◽  
Lian Ming Zhang
Keyword(s):  
Network Topology ◽  
Traditional Method ◽  
New Method ◽  
Power Network ◽  
Breadth First Search ◽  
Slow Speed ◽  
Adjacency List ◽  
Network Connection ◽  
Electric Equipment ◽  
Low Efficiency

Aiming at the defects of repeating searching the path, low efficiency and the slow speed of the traditional topology algorithm, proposes a network topology algorithm based on Breadth-First-Search in this paper.Introduces the topology modeling method,and the electric equipment is abstracted into nodes and branches,making the topology process not constrained by the network connection and structure,enhancing universal property of the algorithm.Then introduces the traditional method, and analysises the disadvantages. At the same time,puts forward a new method. Uses node-branch adjacency list in the new method,which improves the topology speed.When the local switch information is changed, can modify the node-branch adjacency list to conduct the local re-topology,so it improves the topology flexibility. Finally, through the example, proves the superiority and practicability of this algorithm.

Application Analysis of an Improved N-R Iterative Method about Finite Element Numerical Calculation

2010 ◽  
Vol 450 ◽  
pp. 518-521
Author(s):  
Ling Xin Zhang ◽  
Ming Yi Hu ◽  
Ping Chuan Wu
Keyword(s):  
Finite Element ◽  
Numerical Calculation ◽  
Iterative Method ◽  
Nonlinear Problems ◽  
New Method ◽  
Step Size ◽  
Tangent Stiffness Matrix ◽  
Whole Process ◽  
Macro Scale ◽  
Low Efficiency

During the numerical calculation by FE (Finite Element) method, N-R (Newton-Raphson) iterative method will be used to solve the problem such that material performing with elasto-plastic character and geometric non-linearity. However, if the problem has macro scale DOFs (degree of freedom), the classical N-R method is shown to make a low efficiency on the whole process. For this reason, in this paper, an improved N-R iterative method is proposed by creating proper mandatory limiters to change the step size of displacement field increment. In this way, the size of single iterative step is enlarged in the new method with tangent stiffness matrix used as classical N-R iterative theory as well. Furthermore, to test stability of the new method, two models of structure are chosen to be calculated with this method. In the conclusion, the improved N-R iterative method is indicated to be an efficient and stable numerical method which could solve nonlinear problems, especially with macro scale DOFs.

scholarly journals Research on the Dimensional Accuracy Measurement Method of Cylindrical Spun Parts Based on Machine Vision

2018 ◽  
Vol 167 ◽  
pp. 03010
Author(s):  
Xiao Gangfeng ◽  
Zhong Xingwei ◽  
Shen Weixian ◽  
Xia Qinxiang ◽  
Chen Weiping
Keyword(s):  
Machine Vision ◽  
Measurement Method ◽  
Dimensional Accuracy ◽  
New Method ◽  
Edge Detector ◽  
Manual Measurement ◽  
Accuracy Measurement ◽  
Canny Edge ◽  
Low Efficiency ◽  
Relative Errors

A new method for measuring the dimensional accuracy of the cylindrical spun parts based on machine vision was proposed to overcome the artificial deviation and low efficiency of manual measurement. The image acquisition system of machine vision was built up. The methods of image processing and edge extraction of cylindrical spun parts were studied. The straightness and ovality of the cylindrical spun parts were obtained by the proposed new method. The results showed that the edge contour of the cylindrical spun parts extracted by Canny edge detector is better than Sobel and Prewitt edge detector. The dimensional accuracy of the cylindrical spun parts can be obtained accurately by the proposed measurement method based on machine vision. The relative errors of the straightness and ovality between the machine vision and the manual measurement are less than 10%.

The Discussion of Appling Parametric 3D Modeling in Urban Design Based on Cityengine

2013 ◽  
Vol 774-776 ◽  
pp. 1734-1737 ◽  
Author(s):  
Juan Li ◽  
Jie Yu Han ◽  
Li Jiao Hao
Keyword(s):  
Public Participation ◽  
Urban Design ◽  
3D Modeling ◽  
3D Visualization ◽  
Parametric Modeling ◽  
New Method ◽  
Rule Based ◽  
Modeling Process ◽  
Modeling Software ◽  
Low Efficiency

In this paper ,we explored the new method of urban design modeling based on a new rule-based parametric modeling software: CityEngine. Through combining the technology of CityEngine and ArcGIS, we can solve the problems existing in traditional urban design: complex modeling process, poor 3D visualization, low efficiency of modification and poor public participation, and can expand the new technique applications in urban design.

Study of Efficiency Improvements in a Fuel-Cell-Powered Vehicle Using Water Electrolysis by Recovering Regeneration Energy and Avoiding Partial Load Operation

2005 ◽  
Vol 2 (3) ◽  
pp. 202-207 ◽  
Author(s):  
S. Obara ◽  
K. Kudo
Keyword(s):  
Energy Efficiency ◽  
Fuel Cell ◽  
Load Condition ◽  
Water Electrolysis ◽  
Maximum Output ◽  
Storage Mechanism ◽  
Vehicle Operation ◽  
Partial Load ◽  
Drive Motor ◽  
Low Efficiency

Improvements in efficiency of a fuel-cell-powered vehicle have been studied using water electrolysis as the energy storage mechanism. Three methods are proposed for this purpose: 1. The reformer and fuel cell are divided into two or more units, and the maximum output of each unit is set to be small, which reduces the partial load operation, 2. all the fuel cell units are operated above the low efficiency partial load condition and excess electricity is supplied to another fuel cell unit to generate hydrogen and oxygen by water electrolysis, and these gases are compressed and stored, and arbitrary fuel cell units are supplied and they generate electricity, 3. deceleration periods perform water electrolysis of the fuel cell units using the electric power generated by the drive motor, and both gases are compressed and they store in each cylinder. The LA4 cycle (EPA urban dynamometer schedule) was introduced for the vehicle operation. The energy saving effects of the abovementioned methods were studied and were shown to increase the energy efficiency by 1.23 to 1.72 times compared to that for the conventional method.

scholarly journals Does the PillCam SB3 capsule endoscopy system improve image reading efficiency irrespective of experience? A pilot study

2018 ◽  
Vol 06 (06) ◽  
pp. E669-E675 ◽  
Author(s):  
Teppei Omori ◽  
Toshifumi Hara ◽  
Sachiyo Sakasai ◽  
Harutaka Kambayashi ◽  
Shun Murasugi ◽  
...  
Keyword(s):  
Small Intestine ◽  
Capsule Endoscopy ◽  
Reading Time ◽  
Diagnostic Efficiency ◽  
Hospital Data ◽  
Reading Efficiency ◽  
Significant Difference ◽  
Intermediate Readers ◽  
Time Burden ◽  
Small Intestinal

Abstract Background and study aims The aim of this study was tp compare the diagnostic efficiency of the PillCam SB3 capsule endoscopy (CE) system with the older system, PillCam SB2, taking into consideration the experience of the image reader. Patients and methods Small intestinal CE was conducted on 64 patients around May 2014 when the SB3 was introduced in our hospital. Data obtained from 20 patients (SB2: 10 and SB3: 10) based on transit time were assessed by junior (experience: 20 images), intermediate (> 50), and expert readers (> 600). Results Reading time with the CE down to the end of the small intestine was shorter in the SB3 group for each reader (SB2 vs. SB3: junior, 40.2 ± 10.1 vs. 23.7 ± 6.7 [P = 0.0009]; intermediate, 21.4 ± 4.9 vs. 10.3 ± 2.9 [P = 0.0003]; expert, 23.2 ± 5.6 vs. 11.1 ± 2.9 min [P = 0.0002]). Interpretation agreement rates between the findings by junior and intermediate readers and those by the expert reader were 84.6 % and 92.3 %, respectively. For the junior reader, rates of agreement using the SB2 and SB3 systems with those by the expert reader were 85.7 % and 83.3 %, respectively; no significant difference was noted between the two systems. Similarly, for the intermediate reader, the respective agreement rates using the SB2 and SB3 systems were 85.7 % and 100 %, respectively. Conclusions The PillCam SB3 reduces the time burden on readers irrespective of their experience.

scholarly journals Improving rib fracture detection accuracy and reading efficiency with deep learning-based detection software: a clinical evaluation

2020 ◽  
pp. 20200870
Author(s):  
Bin Zhang ◽  
Chunxue Jia ◽  
Runze Wu ◽  
Baotao Lv ◽  
Beibei Li ◽  
...  
Keyword(s):  
Deep Learning ◽  
Reading Time ◽  
Rib Fractures ◽  
Rib Fracture ◽  
Radiology Workflow ◽  
Detection Accuracy ◽  
Reference Standard ◽  
Fracture Detection ◽  
Reading Efficiency ◽  
The Impact

Objectives: To investigate the impact of deep learning (DL) on radiologists’ detection accuracy and reading efficiency of rib fractures on CT. Methods: Blunt chest trauma patients (n = 198) undergoing thin-slice CT were enrolled. Images were read by two radiologists (R1, R2) in three sessions: S1, unassisted reading; S2, assisted by DL as the concurrent reader; S3, DL as the second reader. The fractures detected by the readers and total reading time were documented. The reference standard for rib fractures was established by an expert panel. The sensitivity and false-positives per scan were calculated and compared among S1, S2, and S3. Results: The reference standard identified 865 fractures on 713 ribs (102 patients) The sensitivity of S1, S2, and S3 was 82.8, 88.9, and 88.7% for R1, and 83.9, 88.7, and 88.8% for R2, respectively. The sensitivity of S2 and S3 was significantly higher compared to S1 for both readers (all p < 0.05). The sensitivity between S2 and S3 did not differ significantly (both p > 0.9). The false-positive per scan had no difference between sessions for R1 (p = 0.24) but was lower for S2 and S3 than S1 for R2 (both p < 0.05). Reading time decreased by 36% (R1) and 34% (R2) in S2 compared to S1. Conclusions: Using DL as a concurrent reader can improve the detection accuracy and reading efficiency for rib fracture. Advances in knowledge: DL can be integrated into the radiology workflow to improve the accuracy and reading efficiency of CT rib fracture detection.

A Novel Method to Calculate Frequency Control Word of Direct Digital Synthesizer

2011 ◽  
Vol 267 ◽  
pp. 433-437
Author(s):  
Jian Guo ◽  
Jie Zhu ◽  
Jiu Liu ◽  
Li Zhou
Keyword(s):  
Frequency Control ◽  
Control Word ◽  
Signal Generator ◽  
New Method ◽  
Storage Space ◽  
Direct Digital Synthesis ◽  
Direct Digital Synthesizer ◽  
Digital Synthesis ◽  
Novel Method ◽  
Low Efficiency

When designing signal generator with adjustable frequency based on direct digital synthesis technology (DDS), it is very important to calculate the frequency control word. To address the shortcoming of large computation, low efficiency of frequency setting, more storage space occupied or significant cumulative errors of frequency setting when calculating frequency control word with traditional methods, a novel calculation way for frequency control word is researched in this paper. This new method does not need large computation and more space and simultaneously it can decrease the error greatly, which plays an important role in improving the frequency setting speed and precision in signal generator.

A New Method of Battlefield Situation Collaborative Plotting Based on Ontology

2014 ◽  
Vol 513-517 ◽  
pp. 1365-1371 ◽  
Author(s):  
Wei Feng Shan ◽  
Ji Wen Zhou ◽  
Hong Jie Dai ◽  
Peng Wang
Keyword(s):  
New Method ◽  
Semantic Mapping ◽  
Prototype System ◽  
Slow Speed ◽  
Ontology Construction ◽  
Client Server ◽  
Mapping Problem ◽  
Ontology Integration ◽  
Similarity Calculation ◽  
Low Efficiency

Due to the diversity of the situation information collected in the battlefield, and the conventional way of plotting runs with low efficiency and slow speed. This paper bring forward a new method of battlefield situation collaborative plotting based on ontology, which improves the integration plotting efficiency by formulating the local ontology construction. And based on the local ontology character constructed, solved the semantic mapping problem in the process of rapid ontology integration with a new similarity calculation algorithm.In the end this paper design a battlefield situation collaborative plotting prototype system based on client-server mode consequently.

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