Current Issue : July - September Volume : 2018 Issue Number : 3 Articles : 5 Articles
In order to use psychometric instruments to assess a multidimensional construct, we may\ndecompose it into dimensions and, in order to assess each dimension, develop a set of items, so one\nmay assess the construct as a whole, by assessing its dimensions. In this scenario, content analysis\nof items aims to verify if the developed items are assessing the dimension they are supposed to\nby requesting the judgement of specialists in the studied construct about the dimension that the\ndeveloped items assess. This paper aims to develop a nonparametric statistical approach based on\nthe Cochran�s Q test to analyse the content of items in order to present a practical method to assess\nthe consistency of the content analysis process; this is achieved by the development of a statistical test\nthat seeks to determine if all the specialists have the same capability to judge the items. A simulation\nstudy is conducted to check the consistency of the test and it is applied to a real validation process....
How to maximize customer satisfaction is an important research topic in the service quality evaluation. This paper proposes an\nevaluation method of comprehensive product quality for customer satisfaction based on the intuitionistic fuzzy number. In this\nmethod, we design a questionnaire and investigate the customer�s language evaluation information of product quality evaluation,\nincluding product expectations and product perception at first. And then, the product quality evaluation model is obtained by\nDelphi method; that is, the first-level evaluation indexes and the second-level evaluation indexes are obtained and the weight vector\nof each evaluation index is determined. Next, language evaluation information translates into corresponding fuzzy numbers using\nintuitionistic fuzzy numbers. Therefore, the results of the product quality evaluation of the production system are obtained using\nthe weighted mean method. Finally, an example is used to illustrate the feasibility and effectiveness of the proposed method....
Compaction quality is directly related to the structure and seepage stability of a rockfill dam. To timely and accurately test the\ncompaction quality of the rockfill material, four real-time test indexes were chosen to characterize the soil compaction degree\nbased on the analysis of roller vibratory acceleration, including acceleration peak value (ap), acceleration root mean square value\n(arms), crest factor value (CF), and compaction meter value (CMV). To determine which of these indexes is the most appropriate,\na two-part field compaction experiment was conducted using a vibratory roller in different filling zones of the dam body. Data on\nrolling parameters, real-time test indexes, and compaction quality indexes were collected to perform statistical regression analyses.\nCombined with the spectrum analysis of the acceleration signal, it was found that the CF index best characterizes the compaction\ndegree of the rockfill material among the four indexes. Furthermore, the quantitative relations between the real-time index and\ncompaction quality index were established to determine the control criterion of CF, which can instruct the site work of\ncompaction quality control in the rockfill rolling process...
This paper aims at identifying the key factors to maintain the quality and safety of agricultural products in the agricultural product\nquality and safety information system (APQSIS). Based on the theoretical framework of information entropy and complexity,\nthis paper uses the dynamic evolutionary game model and the multiagent modeling and simulation to discuss the APQSIS\nagents� equilibrium strategies and the effects of their interactive behaviors on the APQSIS evolutionary stability with asymmetric\ninformation. The results show that the governmental supervision and intermediary organizations are significant to assuring\nagricultural product quality and safety (APQS) as well as the effective transmission of APQS information in stable environments\nwith low complexity....
We propose a generalized virus dynamics model with distributed delays and both modes of transmission, one by virus-to-cell\ninfection and the other by cell-to-cell transfer. In the proposedmodel, the distributed delays describe (i) the time needed for infected\ncells to produce newvirions and (ii) the time necessary for the newly produced virions to become mature and infectious. In addition,\nthe infection transmission process is modeled by general incidence functions for both modes. Furthermore, the qualitative analysis\nof the model is rigorously established and many known viral infection models with discrete and distributed delays are extended\nand improved....
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