A new fault-tolerant ATM switch architecture based on Multistage Interconnection Network (MIN) was proposed. Multiple paths between each input-output pair of the network are accomplished by connecting together switching elements within the same stage. Besides that, 2" 2x2 switching element were distributed between stage n to n+l in MIN to increase the paths for each input-output pair. It is self-routing, recursive in structure and smaller network easily be cascaded to form larger network. Compared to the conventional mechanism, it reduces delay and gives better performance in term of stability and throughput .

One of the material in mathematics lesson is algebra operation. Algebraic materials require the students to master the concept of algebra that becomes the basis for learning the next material. However, students still make mistakes in solving problems related to algebra operations. Includes the problem solving form of the story problem that adds difficulties for students. The purpose of this study is to find out what the mistakes and causes of mistakes made by students of class VIII SMP Negeri 1 Banda Aceh in solving the story based on Newman procedures. The approach used is a qualitative approach with the type of research is descriptive. Data collection using tests and interviews. The research involves students VIII-1, amounting to 27 students. Subjects of interview research taken 3 of 27 students class VIII-1, with the criteria of students who do a lot errors. Each subject was interviewed related to the results of his work on the algebra operation about story problem. The validity test of the data was done by triangulation technique. The results of the research indicate that the type of mistakes made by the students of grade VIII-1 SMP Negeri 01 Banda Aceh in solving the algebraic story problem are misunderstanding, transforming mistakes, processing skill mistakes, and the error of writing the final answer. Misunderstanding caused by the students forgetting and rushing in doing the problem. The problem of transformation is caused by the weakness of the student’s ability to change the story into algebra and wrong in using the approach. The error of process skill is caused wrongly in calculating algebraic operations. While the error of writing the final answer caused the students did not make conclusions and did not write the final outcome of the settlement. The implication of this study is the need for further research to reduce the students in making the same mistakes. Further research is also needed on the work that students can do to overcome the mistakes made by students as can be seen in this study.

The ability of mathematical representation is one of the abilities that must be possessed by students in learning mathematics. In fact, students 'mathematical representation ability is still relatively low, so we need a learning model that can improve students' mathematical representation abilities, namely Model Eliciting Activities (MEA) with STAD type. The purpose of this study is to compare the mathematical representation ability of students taught using MEA with STAD type and those taught with conventional learning. The approach to be used is a quantitative approach with a quasi-experimental research method and using a control group pretest-posttest design. The population in this study were all VII grade students. Sampling was done using simple random sampling, which consisted of two classes, class VII1 as the experimental class and class VII2 as the control class. Data collection is used by using a mathematical representation ability test sheet. The data analysis technique used is independent t-test. Based on these analysis it can be concluded that the mathematical representation ability of students taught using MEA with STAD type is better than conventional learning.

This study aims to analyze the factors that influence the production results of shrimp pond farming, namely: length of experience in farming, land area, fry stocking density, amount of feed given, number of workers / laborers, capital, harvest time, and installation of mills. The samples in this study were 45 respondents. Analysis technique used for this research is Cobb-Douglass function model. The results of the analysis show that the experience factor has a significant effect on the 100% confidence level in increasing the production of ponds, both semi-intensively and intensively managed. Statistically at the 95% confidence level, it turns out that every additional 1 year of experience in Vannamei Shrimp farming activities will result in an increase in production yield of 651 kg. Factors such as the area of arable land, the number of workers employed, the density of fry stocked, the number of pinwheels installed, the amount of bait given, and the amount of capital spent statistically still have little effect on increasing the production of Vannamei Shrimp in Pidie Jaya district so far.

The study is done for determining how many students and how the percentage of students who have mastered the material geometry about prism and pyramid, and getting the discriminant function about the mastery of the material. The study population was the entire eighth grade students of SMP Kasih Banda Aceh while the sample were students of class VIII-1 and VIII-8 to 66 students. Based on the research that has been done using the fisher discriminant analysis method, 18,18% of students have mastered the material geometry and 81,82% of students have not mastered the material geometry. It means that from 66 students only 12 students were able to master the material geometry about well- prism and pyramid. The discriminant function that is formed is and .