http://repository.umnaw.ac.id/jspui/handle/123456789/3862 Fri, 10 Apr 2026 08:55:13 GMT 2026-04-10T08:55:13Z http://repository.umnaw.ac.id/jspui/handle/123456789/3903 Title: Jurnal Internasional Authors: Panjaitan, Dedy Juliandri; Suwilo, Saib; Sitompul, Opim S.; Sawaluddin Abstract: The main concern of this paper is to decide the locations and allocations of facilities that impact not only the profitability of an organization but the fast ability to serve customers. Generally the location-routing problem is to minimize the overall cost by simultaneously selecting a subset of candidate facilities and constructing a set of delivery routes that satisfy some restrictions. In this paper we consider the periodic routing of vehicle to be used to distribute goods. Integer programming model is built to solve the problem. A feasible neighbourhood search is developed to solve the result model. Thu, 01 Aug 2019 00:00:00 GMT http://repository.umnaw.ac.id/jspui/handle/123456789/3903 2019-08-01T00:00:00Z http://repository.umnaw.ac.id/jspui/handle/123456789/3901 Title: Jurnal Internasional Authors: Juliandri, Dedi; Mawengkang, Hermawan; Bu’ulolo, F Abstract: Vehicle Routing Problem (VRP) is an important element of many logistic systems which involve routing and scheduling of vehicles from a depot to a set of customers node. This is a hard combinatorial optimization problem with the objective to find an optimal set of routes used by a fleet of vehicles to serve the demands a set of customers It is required that these vehicles return to the depot after serving customers’ demand. The problem incorporates time windows, fleet and driver scheduling, pick-up and delivery in the planning horizon. The goal is to determine the scheduling of fleet and driver and routing policies of the vehicles. The objective is to minimize the overall costs of all routes over the planning horizon. We model the problem as a linear mixed integer program. We develop a combination of heuristics and exact method for solving the model. Mon, 01 Jan 2018 00:00:00 GMT http://repository.umnaw.ac.id/jspui/handle/123456789/3901 2018-01-01T00:00:00Z http://repository.umnaw.ac.id/jspui/handle/123456789/3891 Title: Jurnal Internasional Authors: Novita, Yenni; Hasratuddin; Firmansyah Abstract: This study aims to analyze the improvement of students 'mathematical problem solving abilities through Realistic Mathematics Learning (PMR) assisted by Autograph and Expository learning in class VIII of Al-Washliya 8 Medan Middle School and the interaction between KAM on students' mathematical problem solving abilities. This type of research is a quasi-experimental. The sample selection is done by purposive sampling, obtained a sample of two classes namely VIII-1 with the number of students 30 students and class VIII-2 with the number of students 30. Data processing is done by preliminary testing of normality and homogeneity tests, then testing the hypothesis in accordance with the formulation of the problem / hypothesis. The results of the study stated that the improvement of students' mathematical problem solving skills was better through PMR than Expository and there was no interaction between students' early mathematics learning abilities (high, medium, low) on students' mathematical problem solving abilities. Wed, 01 Jan 2020 00:00:00 GMT http://repository.umnaw.ac.id/jspui/handle/123456789/3891 2020-01-01T00:00:00Z http://repository.umnaw.ac.id/jspui/handle/123456789/3889 Title: Jurnal Internasional Authors: Nur'aini; Firmansyah; Mawengkang, Herman Abstract: This research development aims to develop learning tools realistic mathematics education valid, practical and effective and analyze the improvenment of communication skills in the application of realistic mathematics education learning tools. This study uses 4-D model. The result showed that, validity of RPP product total score of 4.1 was in the “valid” category. Teacher book and student book total score of 4.2 is was in the “valid” category. The LKS total score of 4.1 was in the “valid” category. Practically of learning tools based on the implementation of learning reaches an average of 3.5 with a high category. The effectiveness of learning tools based on student‟s learning reached 85% with complete criteria and improvement of student‟s mathematical communication skills, which increased from 35% to 72% Wed, 01 Apr 2020 00:00:00 GMT http://repository.umnaw.ac.id/jspui/handle/123456789/3889 2020-04-01T00:00:00Z