New requirements for abstract

Dear authors, since April 2018, the volume of abstracts should be at least (more than) 1800 characters. An abstract should identify the purpose of the paper, information about the content of the core idea of paper and provide a brief overview of the results obtained in the research. Please format the abstract as separate paragraphs: (1) Purpose, (2) Methodology / approach, (3) Results, (4) Originality / scientific novelty and (5) Practical value / implications.