Title : Marketing Model For Creative Industry “Batik” Market Oriented In The Industrial Era 4.0 (Case Study Batik Creative Industry Center, Sragen, Indonesia)

For the creative industry market, the industrial era 4.0  enters new challenges, including the batik industry that experiences significant competition, not only between local and national industries, but also competition from various multinational industries. This research aims to design and figure out a valid marketing model for batik products according to market desires and the goodness of fit model, so that the batik produced still exists, saleable in the market and increases the marketing performance. The research was conducted in batik industrial centers throughout Sragen Indonesia with a population of batik entrepreneurs and consumers as users of Sragen's batik products. Methods of data collection are carried out through interviews, questionnaires, observation, documentation and literature study. This research found a model of research & development (R & D) using the object of batik entrepreneurs through quantitative methods of experimental type one group pretest post-test design. Data analysis used structural equation analysis with structural equation modeling (SEM). The developed marketing model is a model of causality, correlation and influence to test hypotheses, identify the dimensions of a construct that is able to measure the influence between the identified factors in its dimensions.

Title : AN OVERVIEW OF THE ROUGHNESS COEFFICIENT ASSOCIATED TO UNIFORM AND NATURAL CHANELS

The roughness coefficient determines the flow resistance in a channel and its accurate estimation is essential for channel design and hydraulic modeling of water systems. Several studies have proposed different equations and methods for their calculation. However, authors differ between each other due to the variability of the flow, thus the coefficient calculation has become a challenging task because of the associated level of uncertainty. In this paper an extensive review of the methods habitually used to calculate the roughness of uniform and natural channels was carried out, considering the regimes associated with the bed microforms. Likewise, the mathematical models developed by different authors for the prediction of bedforms and the calculation of the roughness coefficient are detailed. Finally, a table is presented as a summary exposing each of the proposed equations and their conditions of use to simplify the selection process by readers and encourage the execution of research where the applicability of the different proposals is compared.