OPTIMIZACIÓN DE LA PRODUCCIÓN DE BIOMASAS DE Kluyveromyces marxianus EN LACTOSUERO

Whey is a by-product of cheese making and represents a danger of environmental contamination when discarded without prior treatment. However, due to its high content of lactose, vitamins and proteins, whey should not be considered a waste, but rather a raw material for obtaining value-added products. Among the alternatives for its use, biomass production stands out through fermentation with Kluyveromyces marxianus. Therefore, this work determines the best operating conditions for biomass production, minimizing residual lactose. To this end, a Doehlert Experimental Matrix Design was used to optimize the effects of aeration and nitrogen source concentration on the growth of K. marxianus by a minimum number of experiments. The results obtained allow maximizing the biomass production, the consumption of lactose and protein by K. marxianus, thus achieving a more effective treatment of whey prior to its discard.

Over-Actuated Underwater Robots: Configuration Matrix Design and Perspectives

In general, for the configuration designs of underwater robots, the positions and directions of actuators (i.e., thrusters) are given and installed in conventional ways (known points, vertically, horizontally). This yields limitations for the capability of robots and does not optimize the robot’s resources such as energy, reactivity, and versatility, especially when the robots operate in confined environments. In order to optimize the configuration designs in the underwater robot field focusing on over-actuated systems, in the paper, performance indices (manipulability, energetic, reactive, and robustness indices) are introduced. The multi-objective optimization problem was formulated and analyzed. To deal with different objectives with different units, the goal-attainment method, which can avoid the difficulty of choosing a weighting vector to obtain a good balance among these objectives, was selected to solve the problem. A solution design procedure is proposed and discussed. The efficiency of the proposed method was proven by simulations and experimental results.

RACI Matrix Design for Managing Stakeholders in Project Case Study of PT. XYZ

Stakeholders are one of the most significant factors in the success of a project. The creation of good team performance in a project is caused by clear work responsibilities given to each project stakeholder so that stakeholders have responsibility for their work and can complete their work correctly. The responsibility assignment matrix is ​​a method for managing the roles of each resource and describing the relationship between jobs for each job in the project, which is classified into four parts, namely Responsible, Assignment, Consult, and Informed. In this paper, a matrix will be designed to manage the work assignments of each stakeholder involved in the case of delays in project completion at PT. XYZ uses the RACI Matrix method as a guide. The results of the work assignment matrix design in the case study project of PT. XYZ shows that 12 stakeholders are grouped into four classifications according to the RACI components, which are arranged based on the level of interest and responsibility of each stakeholder to the project.