Object Cut as Minimum Ratio Cycle in a Superpixel Boundary Graph

2013 ◽  
Author(s):  
Gao Zhu ◽  
Yansheng Ming ◽  
Hongdong Li
Keyword(s):  
Minimum Ratio ◽  
Boundary Graph

scholarly journals Multi-Objective Optimization of Integrated Civilian-Military Scheduling of Medical Supplies for Epidemic Prevention and Control

Healthcare ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 126
Author(s):  
Hai-Feng Ling ◽  
Zheng-Lian Su ◽  
Xun-Lin Jiang ◽  
Yu-Jun Zheng
Keyword(s):  
Prevention And Control ◽  
Large Scale ◽  
Medical Services ◽  
The Novel ◽  
Multi Objective ◽  
Medical Supplies ◽  
Problem Instances ◽  
Novel Coronavirus ◽  
And Control ◽  
Minimum Ratio

In a large-scale epidemic, such as the novel coronavirus pneumonia (COVID-19), there is huge demand for a variety of medical supplies, such as medical masks, ventilators, and sickbeds. Resources from civilian medical services are often not sufficient for fully satisfying all of these demands. Resources from military medical services, which are normally reserved for military use, can be an effective supplement to these demands. In this paper, we formulate a problem of integrated civilian-military scheduling of medical supplies for epidemic prevention and control, the aim of which is to simultaneously maximize the overall satisfaction rate of the medical supplies and minimize the total scheduling cost, while keeping a minimum ratio of medical supplies reservation for military use. We propose a multi-objective water wave optimization (WWO) algorithm in order to efficiently solve this problem. Computational results on a set of problem instances constructed based on real COVID-19 data demonstrate the effectiveness of the proposed method.

scholarly journals A comparison of boundary graph grammars and context-free hypergraph grammars

1990 ◽  
Vol 84 (2) ◽  
pp. 163-206 ◽  
Author(s):  
Joost Engelfiet ◽  
Grzegorz Rozenberg
Keyword(s):  
Graph Grammars ◽  
Context Free ◽  
Boundary Graph

Sample sizes for point, double sampling

1992 ◽  
Vol 22 (7) ◽  
pp. 980-983 ◽  
Author(s):  
Richard G. Oderwald ◽  
Elizabeth Jones
Keyword(s):  
Basal Area ◽  
Double Sampling ◽  
Sample Sizes ◽  
Measuring Volume ◽  
Sample Points ◽  
Time Required ◽  
The Cost ◽  
Minimum Ratio

Formulas are derived for determining the total number of sample points and the number of volume points for a point, double sample with a ratio of means estimator to replace a point sample and achieve the same variance. A minimum ratio of the cost of measuring volume to the cost of measuring basal area at a point is determined for which the point, double sample will be less costly, in terms of time required to measure points, than the point sample.

scholarly journals Using Length of Bilge Keel to Length of Waterline Ratio to Reduce Ship Rolling Motion

2018 ◽  
Vol 8 (2) ◽  
pp. 2731-2734
Author(s):  
P. K. D. N. Y. Putra ◽  
B. H. Iskandar ◽  
Y. Novita
Keyword(s):  
Good Stability ◽  
Length Ratio ◽  
Rolling Motion ◽  
Fishing Vessels ◽  
Bilge Keel ◽  
Minimum Ratio ◽  
Ship Rolling

Fishing vessels must have good stability and manoeuvrability. Hull with round bottom shape has a relatively poor rolling duration compared to other forms. Rolling duration reduction will improve the quality of stability of the ship which can be obtained with bilge keel installation. The objectives of this research are 1) to compare each parameter value on model ship by using bilge keel and 2) to determine the minimum ratio of bilge keel's length toward waterline length on the model ship which still has the ability to reduce rolling motion on the ship. The method used was giving treatment to model ship and observing its rolling motion with different lengths of bilge keel. Based on the result of the research, it can be concluded that bilge keel installation with some length ratio toward length of waterline has different results significantly, and bilge keel with length ratio 0.2 still have effective capability in reducing the rolling motion of the model ship.

scholarly journals POSITIONING IMAGES OF SEGMENTED OBJECTS BASED ON QT CROSS-PLATFORM ENVIRONMENT

2020 ◽  
pp. 18-26
Author(s):  
M. E. Golovkin
Keyword(s):  
Scaling Factor ◽  
Single Image ◽  
Image Scaling ◽  
Modern Methods ◽  
Scaling Methods ◽  
Cross Platform ◽  
Series Of Experiments ◽  
The Difference ◽  
Object Features ◽  
Minimum Ratio

The article provides information about the program developed on the basis of the Qt environment, which allows positioning the original image of an object within the field of attention in order to simplify the procedure for generating object features that are invariant to shift, change scale, and rotate its image. Provides an overview of modern methods and software tools for scaling images. The algorithm of the program and a series of computational experiments is described. During the first series, the program positions the image of a triangle within the field of attention using various scaling methods. According to the results of this series, it was concluded which method of scaling an image of an object gives the least loss of quality. In other series of experiments, the program centers and scales the images of a square and a circle inside the attention field with different sizes of the attention field (selection frame) corresponding to a single image scaling factor. Following the results of each series of xperiments, measurements of the sizes of positioned objects were carried out and the dependence of the ratio of their areas on the scaling factor was established. The difference between the maximum and minimum ratio of the coefficients for each series of experiments is calculated. On the basis of the data obtained, it was concluded that for further work with segmented objects of the scene and their positioning in the field of attention, the size of the selection frame of 256x256 pixels can be considered reference.

The Complexity of Minimum Ratio Spanning Tree Problems

2004 ◽  
Vol 30 (4) ◽  
pp. 335-346 ◽  
Author(s):  
Christopher C. Skiścim ◽  
Susan W. Palocsay
Keyword(s):  
Spanning Tree ◽  
Minimum Ratio

Some Recent Developments in the Design of Rigid Airships

1927 ◽  
Vol 31 (203) ◽  
pp. 1029-1036
Author(s):  
W. T. Sandford
Keyword(s):  
Complete Analysis ◽  
Commercial System ◽  
Express Train ◽  
Ocean Liner ◽  
Recent Developments ◽  
Safety And Reliability ◽  
The Subject ◽  
Minimum Ratio ◽  
Horse Power

This paper is primarily intended to stimulate discussion on a subject of increasing interest to aeronautical students and of rapidly growing interest to commercial aeronautics. It must not by any means, therefore, be looked upon as a complete analysis of the subject, but rather as an introduction to the most important questions arising in recent development.In considering this question we must first define the particular requirements of the large rigid airship. The airship must be looked upon with regard to the aeroplane rather as the ocean liner is looked upon with regard to the express train and not in any sense as a rival of the aeroplane. They each have their own distinctive duty.Any commercial system depends upon safety and reliability. The airship designer has, therefore, the problem of making a structure safe under any conditions of flight and having a minimum ratio of structural weight to useful weight per horse-power.

scholarly journals CNT-Based Solar Thermal Coatings: Absorptance vs. Emittance

Coatings ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1101
Author(s):  
Yelena Vinetsky ◽  
Jyothi Jambu ◽  
Daniel Mandler ◽  
Shlomo Magdassi
Keyword(s):  
Carbon Nanotubes ◽  
Stainless Steel ◽  
Solar Thermal ◽  
Good Adhesion ◽  
Solar Absorptance ◽  
Novel Approach ◽  
Binder Concentration ◽  
Excellent Adhesion ◽  
Minimum Ratio

A novel approach for fabricating selective absorbing coatings based on carbon nanotubes (CNTs) for mid-temperature solar–thermal application is presented. The developed formulations are dispersions of CNTs in water or solvents. Being coated on stainless steel (SS) by spraying, these formulations provide good characteristics of solar absorptance. The effect of CNT concentration and the type of the binder and its ratios to the CNT were investigated. Coatings based on water dispersions give higher adsorption, but solvent-based coatings enable achieving lower emittance. Interestingly, the binder was found to be responsible for the high emittance, yet, it is essential for obtaining good adhesion to the SS substrate. The best performance of the coatings requires adjusting the concentration of the CNTs and their ratio to the binder to obtain the highest absorptance with excellent adhesion; high absorptance is obtained at high CNT concentration, while good adhesion requires a minimum ratio between the binder/CNT; however, increasing the binder concentration increases the emissivity. The best coatings have an absorptance of ca. 90% with an emittance of ca. 0.3 and excellent adhesion to stainless steel.

Sign in / Sign up

Export Citation Format

Share Document