scholarly journals Selection of Optimal Path Control Algorithms for Probe Heads Used on Five-Axis Measuring Systems

2018 ◽  
Vol 8 (12) ◽  
pp. 2455 ◽  
Author(s):  
Adam Gąska ◽  
Piotr Gąska ◽  
Maciej Gruza ◽  
Jerzy Sładek
Keyword(s):  
Path Planning ◽  
Measurement Errors ◽  
Scientific Practice ◽  
Optimal Path ◽  
Measuring Systems ◽  
Factors Affecting ◽  
Path Control ◽  
Five Axis ◽  
The Impact ◽  
Selection Of

The utilization of rotational movements of a probing system during points measurementscontributes to the reduction of measurement duration and increases measurement repeatability.However, knowledge on such behavior and accuracy of probing systems is still unsatisfactory.Machines combined with articulating probing systems that have the ability of continuous indexationbecome redundant systems, which means that the same points can be measured using almost infinitemutual configurations of the machine and probe stylus orientations. Therefore, the proper selectionof inspection path planning method becomes one of the main factors affecting the accuracy of themeasurement. It is possible to assess the impact of this factor on the accuracy of the measurementby comparing the results of the measurements of gauge elements, which are done using differentpath controlling algorithms. After that, the best method for basic measuring tasks can be chosenin order to reduce measurement errors. Measurements of the multi-feature check gauge, using thedefault method for path planning and those chosen on the basis of described experiments, indicatesthat the improvement of accuracy may reach several microns. Results presented in this paper can bedirectly transferred to similar systems and measuring tasks, which are commonly met in industrialand scientific practice.

scholarly journals The Factors of Deterioration of Natural Pastures From The View Point of Agricultural Employees in Al-Muthanna Governorate

2021 ◽  
Vol 923 (1) ◽  
pp. 012066
Author(s):  
Emad Fahad Nafeh Al-Bahli ◽  
Mahmoud Hadis Jassim Al-Jumaili
Keyword(s):  
Personal Characteristics ◽  
Research Area ◽  
Point Of View ◽  
Personal Factors ◽  
Factors Affecting ◽  
Work Location ◽  
Natural Factors ◽  
Significant Difference ◽  
The Impact ◽  
Selection Of

Abstract The research aimed to determine the impact studied factors represented by (people’s activities, government activities, natural factors) on the deterioration of natural pastures in the Governorate of Al-Muthanna the point of view of agricultural employees in the governorate. The research included all agricultural employees with a preparatory scientific qualification in agriculture and above in the governorate their number is (94) employees. A questionnaire was prepared to collect the data necessary to achieve the objectives of the research. It consisted of two parts. The first part included the factors related to the employees, which are (term of service, academic achievement, participation in extension activities, job position and work location). The second part included a measure to identify the agricultural employees’ the point of view of on the factors affecting the deterioration of natural pastures. It consists of (46) section spread over (3) field covered by the research. The results showed that government activities have the most impact on the deterioration of natural pastures, it was found a statistically significant difference in the respondents’ point of view about the influence of the studied factors according to their personal characteristics. The researchers concluded the necessity of agricultural expansion in pasture lands and industrial investments, as well as the importance of personal factors in assigning employees who can work in the development of natural pastures, and the researchers recommend activating government laws for the protection of natural pastures to prevent abuses (people’s activities, government activities) that contributed greatly to the deterioration of vegetation cover in the research area and taking into account the factors studied in the selection of workers in the development of natural pastures in the research area.

Clinical implication of using up both fluoropyrimidine (FU) and paclitaxel (PTX) in patients with severe peritoneal metastases (SPM) of gastric cancer (GC).

2021 ◽  
Vol 39 (3_suppl) ◽  
pp. 221-221
Author(s):  
Hiroyuki Arai ◽  
Eisuke Inoue ◽  
Kensei Yamaguchi ◽  
Narikazu Boku ◽  
Hiroki Hara ◽  
...  
Keyword(s):  
Clinical Implication ◽  
Prognostic Score ◽  
Glasgow Prognostic Score ◽  
Best Supportive Care ◽  
Combination Strategy ◽  
Factors Affecting ◽  
The Difference ◽  
Post Hoc ◽  
The Impact ◽  
Selection Of

221 Background: JCOG1108/WJOG7312G trial showed favorable but not significantly better outcomes of 5-FU/ l-leucovorin ( l-LV) /PTX combination (FLTAX) compared to 5-FU/ l-LV (FL) in untreated patients with SPM of GC. However, a half of patients treated with FL could not sequentially use PTX which is a key drug for peritoneal metastasis. We conducted a post hoc analysis to investigate the clinical implication of using up both FU and PTX in either combination or sequential strategy for GC patients with SPM. Methods: Among 101 patients enrolled in the trial (FL: N = 51; FLTAX: N = 50), overall survival (OS) was compared between three subgroups: patients treated with FL followed by PTX (FL/PTX: N = 25), those treated with FL followed by best supportive care (BSC) (FL/BSC: N = 21), and those treated with FLTAX (per protocol population, N = 48). To identify the factors affecting the likelihood of using sequential PTX (LUSP), we compared baseline characteristics between the FL/PTX and FL/BSC subgroups. Each baseline covariate was tested for the impact on LUSP by logistic regression model. The difference of treatment efficacy between FL and FLTAX was assessed in subgroups stratified by the factors identified to affect LUSP. Results: Patients in the FL/PTX subgroup showed significantly better OS than those in the FL/BSC subgroup (median OS, 7.8 vs 2.0 months; hazard ratio [HR] 0.24, 95% confidence interval [CI] 0.12-0.48, p < 0.01) and equivalent OS compared to those in the FLTAX subgroup (median OS, 7.8 vs 8.0 months; HR 0.83, 95% CI 0.50-1.39, p = 0.49). Compared with patients in the FL/BSC subgroup, those in the FL/PTX subgroup had a trend for lower frequency of Glasgow prognostic score (GPS) 2 (40.0% vs 66.7%, p = 0.17) and unresectable type (76.0% vs 95.2%, p = 0.07). GPS 2 and unresectable type were identified as factors with a worse impact on LUSP compared to GPS 0 and recurrent type, with odds ratio (OR) of 0.29 (95% CI 0.05-1.78, p = 0.18) and that of 0.16 (95% CI 0.02-1.44, p = 0.10), respectively. Among all patients enrolled in the trial, 43 patients had both GPS2 and unresectable type (score 2), 45 had either (score 1), 11 had neither (score 0), and two lacked the data of GPS. Median OS in the patients with score 2, 1, and 0 was 4.7, 7.8, and 18.8 months, respectively (score 2 vs 0, HR 4.37, 95% CI 1.84-10.42; score 1 vs 0, HR = 2.80, 95% CI 1.19-6.64). Compared to FL, FLTAX showed better OS in patients with score 2 (HR = 0.60, 95% CI 0.32-1.13) and in those with score 1 (HR = 0.77, 95% CI 0.42-1.42), but worse OS in those with score 0 (HR = 4.74, 95% CI 0.49-45.85). Conclusions: Combination or sequential use of active two drugs, 5-FU and PTX, might contribute to better OS of GC patients with SPM. However, because selection of patients suitable to sequential use is difficult, the combination strategy FLTAX is a favorable treatment option.

Factors Affecting the Selection of BIOX® as the Preferred Technology for the Treatment of a Refractory Gold Concentrate

2015 ◽  
Vol 1130 ◽  
pp. 191-196 ◽  
Author(s):  
Jan van Niekerk
Keyword(s):  
Operating Cost ◽  
Process Selection ◽  
Factors Affecting ◽  
Process Route ◽  
Refractory Gold ◽  
Project Risks ◽  
Fundamental Research ◽  
The Impact ◽  
Specific Project ◽  
Selection Of

The BIOX®process was developed in the late 1980’s for the treatment of refractory gold concentrates. The process has since developed into a commercially proven process with 12 successful installations of which 6 are currently still in operation. During this time development of the technology continued to improve the efficiency of the process, improve the reliability of the equipment used and to reduce the capital and operating cost for the implementation and operation of the process.This paper will look at some critical aspects in the selection of the BIOX as the preferred technology for the treatment of a refractory gold. Process selection will include technical criteria, for example the amenability of a concentrate to biooxidation and process design criteria, but will also include the overall project economic evaluation, a study of the project risks, the impact of the project and technology on the environment and local communities, operability of the process and implementation strategy.It is important that these aspects be taken into consideration in the design of any testwork program, be it fundamental research in the biooxidation field or in the development of a specific project. The impact of decisions taken during the execution of the program must also be tested continuously to gauge the impact on the overall process viability.The selection of biooxidation as the preferred process route for any project, be it gold, copper or any other mineral, will in most cases be based on the overall project economics compared to other processes, rather than technical considerations.

scholarly journals Assessment of the Impact of Probe Head Hysteresis on the Accuracy of Five-Axis Coordinate Measuring Systems

2017 ◽  
Vol 11 (3) ◽  
pp. 277-282
Author(s):  
Piotr Gąska ◽  
Maciej Gruza ◽  
Adam Gąska ◽  
Wiktor Harmatys ◽  
Jerzy Sładek
Keyword(s):  
Measuring Systems ◽  
Five Axis ◽  
The Impact ◽  
Probe Head

scholarly journals The Analysis of Effectiveness of Conveyor Belt Tensioning Systems

2020 ◽  
Vol 3 (1) ◽  
pp. 283-293
Author(s):  
Piotr Kulinowski ◽  
Piotr Kasza ◽  
Jacek Zarzycki
Keyword(s):  
Conveyor Belt ◽  
Operating Conditions ◽  
Laboratory Model ◽  
Static Characteristics ◽  
Belt Conveyor ◽  
Measuring Systems ◽  
Belt Speed ◽  
The Impact ◽  
The Relationship ◽  
Selection Of

AbstractThe publication presents the evaluation of the effectiveness of belt tensioning systems based on the results of model laboratory tests. The types of tensioning devices most commonly used in industry were selected for testing: winch, gravity, pneumatic and follower. The evaluation of the efficiency of belt tensioning devices is complex, as the tensioning system is not autonomous and is only part of the belt conveyor equipment. Therefore, the publication presents the impact of belt tension force on the durability of basic conveyor components such as the belt and its joints, and drums. The characteristics of the tested belt tensioning devices are presented and the construction and research capabilities of the laboratory model of the belt conveyor are described. Measuring systems mounted on the conveyor are described in detail, enabling recording of variable conveyor operating conditions, measuring belt speed, driving force and belt stress. The results of the research are the experimental static characteristics of the most commonly used tensioning devices, which show the relationship between the drive moment and the belt tensioning force. Obtained characteristics will allow the development of guidelines for the design and selection of the most effective belt tensioning devices.

scholarly journals (Factors Affecting the Selection of the Saudi Consumer for Commercial Centers in Najran City (Saudi Arabia: العوامل المؤثرة على اختيار المستهلك السعودي للمراكز التجارية في مدينة نجران (المملكة العربية السعودية)

2017 ◽  
Vol 1 (8) ◽  
Author(s):  
   Mohamed El Amin Mahmoud Mohamed - Rami Osama El Ali
Keyword(s):  
Consumer Choice ◽  
Secondary Data ◽  
Primary Data ◽  
Shopping Malls ◽  
Factors Affecting ◽  
The Family ◽  
Statistical Hypotheses ◽  
The Subject ◽  
The Impact ◽  
Selection Of

This study aimed to identify factors that affecting on Saudi consumer choice for shopping malls in Najran city. The study problem was determining those factors that drive Saudi consumer to shopping in those malls. The Statistical hypotheses that examined the impact of the following factors on consumer choice to shopping malls in najran were formulated: mall environment, the products offered at the mall, the price, the promotion, the location of the mall, mall employees, the family atmosphere and entertainment. To get the results, this study used descriptive analytical approach according to primary data that collected through questionnaire tool and secondary data that collected from books and scientific articles related to the subject. The study reached that there is significant statistical impact of the following variables: mall environment, verity of products, products prices. Promotion, mall place, mall employee’s services, and family atmosphere and entertainments on consumer choice to shopping malls in Najran. The more important recommendations of the study are the shopping malls must pay attention to provide some entertainment for customers of all ages with a view to attract them to the shopping malls.

scholarly journals An Improved Dueling Deep Double-Q Network Based on Prioritized Experience Replay for Path Planning of Unmanned Surface Vehicles

2021 ◽  
Vol 9 (11) ◽  
pp. 1267
Author(s):  
Zhengwei Zhu ◽  
Can Hu ◽  
Chenyang Zhu ◽  
Yanping Zhu ◽  
Yu Sheng
Keyword(s):  
Neural Network ◽  
Path Planning ◽  
Optimal Path ◽  
Model Performance ◽  
Research Direction ◽  
Learning Performance ◽  
Utilization Rate ◽  
The Neural Network ◽  
Experience Replay ◽  
The Impact

Unmanned Surface Vehicle (USV) has a broad application prospect and autonomous path planning as its crucial technology has developed into a hot research direction in the field of USV research. This paper proposes an Improved Dueling Deep Double-Q Network Based on Prioritized Experience Replay (IPD3QN) to address the slow and unstable convergence of traditional Deep Q Network (DQN) algorithms in autonomous path planning of USV. Firstly, we use the deep double Q-Network to decouple the selection and calculation of the target Q value action to eliminate overestimation. The prioritized experience replay method is adopted to extract experience samples from the experience replay unit, increase the utilization rate of actual samples, and accelerate the training speed of the neural network. Then, the neural network is optimized by introducing a dueling network structure. Finally, the soft update method is used to improve the stability of the algorithm, and the dynamic ϵ-greedy method is used to find the optimal strategy. The experiments are first conducted in the Open AI Gym test platform to pre-validate the algorithm for two classical control problems: the Cart pole and Mountain Car problems. The impact of algorithm hyperparameters on the model performance is analyzed in detail. The algorithm is then validated in the Maze environment. The comparative analysis of simulation experiments shows that IPD3QN has a significant improvement in learning performance regarding convergence speed and convergence stability compared with DQN, D3QN, PD2QN, PDQN, PD3QN. Also, USV can plan the optimal path according to the actual navigation environment with the IPD3QN algorithm.

scholarly journals Optimal Path Planning for Selective Waste Collection in Smart Cities

Sensors ◽  
2019 ◽  
Vol 19 (9) ◽  
pp. 1973 ◽  
Author(s):  
María-Victoria Bueno-Delgado ◽  
José-Luis Romero-Gázquez ◽  
Pilar Jiménez ◽  
Pablo Pavón-Mariño
Keyword(s):  
Path Planning ◽  
Open Source ◽  
Smart Cities ◽  
Optimal Path ◽  
Geographical Information ◽  
Practical Case ◽  
Waste Collection ◽  
Optimal Path Planning ◽  
The Impact ◽  
The City

Waste collection is one of the targets of smart cities. It is a daily task in urban areas and it entails the planning of waste truck routes, taking into account environmental, economic and social factors. In this work, an optimal path planning algorithm has been developed together with a practical software platform for smart and sustainable cities that enables computing the optimal waste collection routes, minimizing the impact, both environmental (CO2 emissions and acoustic damage) and socioeconomic (number of trucks to be used and fuel consumption). The algorithm is executed in Net2Plan, an open-source planning tool, typically used for modeling and planning communication networks. Net2Plan facilitates the introduction of the city layout input information to the algorithm, automatically importing it from geographical information system (GIS) databases using the so-called Net2Plan-GIS library, which can also include positions of smart bins. The algorithm, Net2Plan tool and its extension are open-source, available in a public repository. A practical case in the city of Cartagena (Spain) is presented, where the optimal path planning for plastic waste collection is addressed. This work contributes to the urban mobility plans of smart cities and could be extended to other smart cities scenarios with requests of optimal path planning.

scholarly journals - The factors affecting the evaluation and selection of hotels - An analytical study of a field a sample of tourists visiting the State of Djelfa - Algeria: العوامل التي تؤثر في تقييم واختيار الفنادق - دراسة ميدانية تحليلية لعينة من السياح الذين يقصدون ولاية الجلفة- الجزائر-

2020 ◽  
Vol 4 (3) ◽  
Author(s):  
Hiba Ali Toual, Siham Salem Mahamdi
Keyword(s):  
Interior Design ◽  
The State ◽  
Factors Affecting ◽  
The Social ◽  
Independent Variable ◽  
And Gender ◽  
Definition Of ◽  
The Impact ◽  
The Relationship ◽  
Selection Of

This research aims to study the impact of a range of factors on the evaluation and selection of hotels, for that we’ve conducted a study based on the descriptive analytical approach, where 100 questionnaires were distributed to a random sample of tourists visiting the state of Djelfa- Algeria. The study found that the evaluation and selection of the hotel within the sample members is influenced by the range of factors covered by the study (the purpose of the visit, the definition of value by the visitor, the social and economic factors, age and gender, race or religion). Depending on the correlation coefficient value (R 0.885), the relationship between the independent variable and the dependent variable was strong, and the independent variable explains 77.2%of the dependent variable. Finally, the study has presented a set of recommendations, which conclude in:- Renovation and development of the interior design of hotels;- Annual training programs including the hotel staff and this is to learn about new trends in the hotel’s industry.

Sign in / Sign up

Export Citation Format

Share Document