Analisa Pembagian Penggunaan Bandwidht Untuk Jaringan Internet Pelanggan Mnc Play Area Jakarta Dengan Menggunakan Teknologi Link Aggregation Dan Load Balance

<p>Dalam sebuah perusahaan penyedia layanan jaringan internet, di tuntut untuk memiliki<br />kulitas jaringan <em>high availability</em> dan <em>high reliability</em>. Dalam mendukung kualifikasi<br />jaringan internet terbaik maka salah satunya perlu menjaga kestabilan bandwidth<br />internet pelanggan. Salah satunya menjaga kepadatan traffic data pada jaringan internet.<br /><em>Congestion</em> merupakan pengumpulan paket data yang melebihi kapasitas bandwidth<br />yang tersedia padasebuah link, hal ini memberikan dampak penurunan kinerja jaringan<br />internet. Permasalahan di atas dapat di selesaikan salah satunya dengan menerapkan<br />penggunaan metode <em>link aggregation</em> dan teknologi <em>load balance</em>. Pada penelitian ini<br />penulis menerapkan metode <em>link aggregation</em> yang digunakan dalam merancang<br /><em>redundancy link</em> dan <em>load balance</em> dalam membuat skema membagi traffic untuk<br />penyeimbang beban berdasarkan <em>src address</em> dan <em>src port</em>, serta <em>dst address</em> dan <em>dst</em><br /><em>port.</em> Dari hasil pengujian penggunaan <em>link aggregation</em> dan <em>load balance</em> pada<br />penenlitian ini dapat membantu menjaga kestabilan throughput dengan nilai pengukuran<br />sebesar 10GB dengan standart MTU (<em>Maximum Transmission Unit</em>) yang menandakan<br />hasil test pengukuran paket data terbesar yang dapat di transmisikan melalui sebuah<br />jaringan.</p><p><br /><em><strong>Keyword</strong> : link aggregation, load balance, congestion, MTU</em></p>

INCREASING THE COMFORTABILITY OF THE VEHICLE DURING ACCELERATION BY IMPROVING THE DESIGN AND CONTROL METHODS OF THE MOTOR-TRANSMISSION UNIT

The derivative of acceleration with respect to time is used to evaluate and ensure driving comfort during acceleration and deceleration. Frequent and rapid changes in acceleration means frequent and rapid deformation, which can lead to the destruction of the load. The article proposes to minimize the amount of acceleration due to the rational choice of transmission ratios in intermediate gears and the law of changing the engine torque. The use of continuously variable transmissions allows you to solve the problem by choosing a rational law for changing the gear ratio of the transmission. The method of selection at the stage of car design of the maximum effective engine power and transmission ratio in top gear is proposed, taking into account the improved formula for calculating the aerodynamic resistance to motion. The required laws of change in the efficiency of the torque and engine power have been determined. The use of a continuously variable transmission allows the engine to operate at a constant high-speed mode and provides control over the acceleration of the car by changing the fuel supply. It is determined that the engine power expended on the movement with the adjustment of the acceleration of the car will be less than with unregulated acceleration if the exponent at the speed of the car, obtained experimentally, is less than one. Keywords: car; comfort; continuously variable transmission; motor-transmission unit; power; overclocking; aerodynamic resistance; gear ratio

Stiffness modelling of flexible support module for Large-aperture laser transmission unit

Large-aperture laser transmission unit (LLTU) is a device that focuses the laser beam to the center of the target, which are often designed as compliant mechanisms to achieve micro displacement adjustment. In the traditional mechanisms, they are designed as integrated micromanipulation systems, and driven by piezoelectric ceramics. However, most of these researches only focuses on motion accuracy, due to the lack of consideration of large load problems, the application is greatly limited. To this end, a flexible support module (FSM), as well as its stiffness model, was presented in this paper. Combined with finite element method (FEM) of FSM, structure size optimization was also completed, successfully solved the problems of stress concentration and load of FSM in engineering application. Moreover, a dual vision-based measurement method was introduced, to verify the stiffness model and analyze the repetitive error of FSM. From this result, the prototype enabled 5 mm and 0.007 rad of working area with average error of 0.3192 mm and -0.0036 rad. The repeatable error is within 7%, and will decreased to 4% with internal stress released in 5~15min.

The Effects of Programming with Arduino Students’ Achievements, Attitudes and Self-Sufficiency Intented for Science

This reasearch aims at examining the effect of Arduino programming on sixth grade students’ achievement, self-efficacy and attitudes towards the Science course. The research was carried out in a public school in Ereğli district of Zonguldak province during the Spring Semester of the 2016-2017 Academic Year. The sample of the study, in which the pretest with control group and the quasi-experimental research method with posttest group was adopted, consists of a total of 64 students studying in the sixth grade, 32 of whom are experiment group and 32 of them are the control group. In the experimental group, the activities in the electricity transmission unit were carried out using Arduino, while in the control group, the activities in the textbook were carried out. Achievement tests, self-efficacy scales and attitude scales were used as data collection tools in the study. Independent sample t-test analysis was performed with the raw scores obtained from the tests and scales. According to the findings obtained from the research, no significant difference was found between the experimental group students and the control group students’ success and self-efficacy in the electricity transmission unit. It was concluded that there was a significant difference in favor of the experimental group in terms of their attitudes towards the Science course. Some suggestions were made to educators and researchers in line with the results obtained.