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Every company cannot be separated from transportation problems, both for the procurement of raw materials or in allocating finished goods. One method that can be used to minimize transportation costs is to optimize the distribution of goods as possible, using transportation methods. Given the complexity of supply chain problems, the use of metaheuristic methods such as genetic algorithms is expected to be able to quickly resolve supply chain problems, where time is a mandatory requirement to satisfy the market. The problem in the application of genetic algorithms in this study is the distribution of three levels. This study uses 3 producers, 3 agents, 5 distributors and 7 retails. Optimal solutions were obtained from population sizes of 10, 20, and 30 with a combination of mutation probabilities, 0.1 and 0.2, crossover probabilities of 0.1 and 0.2, amounting to 100.454, by conducting experiments 20 times for each genetic parameter. The lowest cost distribution is obtained at population size 20, mutation probability 0.1 and crossover probability 0.2. Based on these results obtained goods distribution channels from each producer, agent and distributor.

Learning of research method required effective instruction to help students developed research and academic writing skills. Various approaches had been offered to overcome this obstacle. However, these approaches do not have a special treatment to produce a model of instructional activity in generating research and academic writing well. This paper aims to describe the activities structure of a developed learning line to support research and academic writing skills for students in the mathematics education department. The design research method containing preliminary design, teaching experiment and retrospective analysis was applied. The research described how developed learning line on research contributed to 30 students in mathematics education department in Universitas Negeri Medan. Explicitly, the developed learning line on research was successful in promoting understanding of a research process.

Literature review as a crucial requirement in planning a mathematics education research project has received attention in the lecturing of mathematics education research methods in higher education environments. However, the students’ ability to write literature reviews that require skills in managing and analyzing previous relevant research to students’ research requires special attention. This paper aims to represent the significant activities in supporting students’ ability to collect, structure, summarize research finding, and write literature reviews that are relevant to students’ research. Initial data of 15 students’ writing literature review ability was analyzed. Design research comprised the preliminary design, teaching experiment, and retrospective analysis was applied. The outcome of the research presents that students can produce scientific articles through the developed activities of writing literature reviews.

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