Papers by Keyword: Statistical Analysis

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Authors: Vincenzo Franzitta, Angelo Milone, Daniele Milone, Salvatore Pitruzzella, Marco Trapanese, Alessia Viola
Abstract: This paper proposes two complementary procedures for assessing the global quality comfort: the first one, prevalently objective, is based on the acquisition of microclimate measured data and computed subjective values; the second one, that is purely subjective, uses a questionnaire drawn from the ISO/DP 10551 Recommendation. An application to some lecture-halls and laboratories of the school is here showed.
Authors: Zhen Po Wang, Peng Liu, Hai Bin Han, Chun Lu, Tao Xin
Abstract: The location and the overall arrangement of the charging stations is an important problem with the development of electric vehicles. It is related to the charging needs, city planning, service level of charging station, geographic location and competitive ability and so on. A distribution model of EV charging station is introduced in the paper. In order to describe the model preferably, this paper introduces the attractive factor of charging stations and the area-different factor. The model can give the charging station rational positions by analyzing the data of the traffic flow and the electric-consuming-rate of cars on the road. A case study is given to illustrate the applying the model.
Authors: M.H. Hsu, K.W. Su, C.J. Chang, C.Y. Chen, C.W. Chen, P.Y. Chung
Abstract: After many Internet-scale worm incidents in recent years, it is clear that a simple self-propagating worm can quickly spread across the Internet and cause severe damage to our society. Facing this great security threat, we need to build an early detection system. With coming of information society, the most important thing for all countries around the world is to terminate digital divide. Many searches to realize the condition of digital divide utilize diverse methods answering to standards of modern science. It also assess benefit in need of the falling head scheme resolved by government organizations. According to this paper, it presents divergence in gender by using weibo. In a conclusion, Male takes weibo as a tool to pass time. Female is caring for weibo about entertainments and social events. Male is caring for weibo about politics, sports and economy. There are only few obvious divergences in using webio by gender.
Authors: Kun Qian Wang, Ren Ping Xu, Jie Hui Lin
Abstract: surface formula based on stress ratio was proposed in consideration of the effects of stress ratio on fatigue crack growth rate and the scatter of fatigue crack growth. The parameters of surface formula were estimated by using the linear principle of no-linear function. The surface formula was applied on GC4 steel to analyze statistically the effects of stress ratio on fatigue crack growth rate. The results showed that the crack growth rate will increases as the stress ratio increases in the stable stage of fatigue crack propagation for GC4 steel. The increase trend is more obvious when higher reliability is demanded.
Authors: Es Ghadiri Zahrani, H. Soleimanimehr, Amir Heidari Shahmaleki, D. Zamani
Abstract: Superalloy is an alloy that has been developed to be used in processes with high thermal and mechanical stresses and also preserving high surface stabilities. Because of the increase in temperature and wearing of tool tip (even in low cutting speeds), machining of these materials has not developed considerably. Increase in demand for machining of these materials equally increases the need for investigating their manufacturing methods. For this reason, optimal machining of superalloys is very important and is under great investigations. The most important parameter for manufacturing companies is surface roughness. In the present paper, surface roughness of Udimet500 superalloy which is a nickel-based superalloy is investigated. Based on regression analysis, the most influential parameters to surface roughness are obtained and a relation for the roughness with respect to depth of cut, cutting speed, feed rate and lubricant type (CO2, Z1 or dry) is derived.
Authors: Dan Dan Gong, Xiao Hong Su, Tian Tian Wang, Pei Jun Ma
Abstract: Path-based fault-localization technique is proved to be more effective than coverage-based fault localization because of analyzing the semantics of a program. Most previous work focused on investigating coverage-based test-suite reduction approach for fault localization. But it is not suitable for path-based fault localization, because it only analyzes coverage information, and does not take the execution path information of test cases into account. In this paper, we propose a test-suite reduction approach for path-based fault localization. This approach analyzes the concrete execution path of test cases. The experimental results show that the proposed method works well in improving the effectiveness of path-based fault localization.
Authors: Alexei Vinogradov, A. Leksovskii
Authors: Jacek Pietraszek, Norbert Radek, Konrad Bartkowiak
Abstract: Carbide coatings have numerous industrial applications due to their high abrasion, sliding and erosion resistance. The paper presents results of an advanced statistical analysis – involving auxiliary simulation methods like smooth bootstrapping and imputing of missing data – executed on surface layer profile of modified carbide-ceramic coatings. Source data were gathered in the previous research by Radek and Bartkowiak focused on microstructure analysis (SEM Joel JSM-5400), microhardness (Vickers method), roughness (FORM TALYSURF-120L) and adhesion (CSEM REVETEST)) tests. Anti-wear coating were first deposited on carbon steel C45 from WC-Co-Al2O3 electrodes in the process of the electro-spark alloying (ESA) by the EIL-8a apparatus. In the next step the coating were laser melted using impulse mode of Nd:YAG laser (BLS 720 model). Due to significant irregularity of collected data, the special methods of smoothing and imputing were involved based on Monte-Carlo methods. The collected data set was several times randomly divided into analytical and verification sub-sets and mentioned methods were applied. The results were used to calculate descriptive statistics like average values, variances, confidence intervals and smoothed histograms of probability distributions. The validity of the proposed approach was positively verified and it significantly improved quality of the results. The smoothing and imputing of data allow to avoid numerical artifacts that may arise during the classical statistical calculations on irregular data.
Authors: Mehdi Vahdati, Mohammad Sedighi, Hossein Khoshkish
Abstract: In this paper, spring-back and its effect on geometrical and dimensional accuracy of incremental sheet metal forming (ISMF) process has been studied. The influence of process parameters such as: vertical step size, sheet thickness, tool diameter, feed rate and spindle speed have been investigated. A series of experimental tests have been carried out for a straight groove bead-shape part made of aluminum sheets. A reliable statistical analysis has been carried out to extract the importance of each parameter. The obtained model permits to select appropriate process parameters to reduce spring-back effectively.
Authors: Zhong Hong Wu, Zhang Song Shi, Zhao Ming Shi, Ying Lv
Abstract: Aiming at problem about real-time processing power is poorer as the cause of too many clutter plots in multisource information fusion conditions when traditional information algorithm is used, method of sensor clutter elimination based on statistical characteristics analysis is put forward. Firstly, statistical characteristics of clutter plots are extracted, calculated and analyzed. Secondly, in combination with the advantages of multi-sensor detection, the plots of real-target have been filtered according to certain threshold values and safeguarded. Finally, a specific simulation experiment is given. Experiment shows this method can achieve the real-time processing power effectively.
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