A discrete-time performance model for congestion control mechanism using queue thresholds with QOS constraints

This paper presents a new analytical framework for the congestion control of Internet traffic using a queue threshold scheme. This framework includes two discrete-time analytical models for the performance evaluation of a threshold based congestion control mechanism and compares performance measurements through typical numerical results. To satisfy the low delay along with high throughput, model-I incorporates one threshold to make the arrival process step reduce from arrival rate ¿1 directly to ¿2 once the number of packets in the system has reached the threshold value L1. The source operates normally, otherwise. Model-II incorporates two thresholds to make the arrival rate linearly reduce from ¿1 to ¿2 with system contents when the number of packets in the system is between two thresholds L1 and L2. The source operates normally with arrival rate ¿1 before threshold L1, and with arrival rate ¿2 after the threshold L2. In both performance models, the mean packet delay W, probability of packet loss PL and throughput S have been found as functions of the thresholds and maximum drop probability. The performance comparison results for the two models have also been made through typical numerical results. The results clearly demonstrate how different load settings can provide different tradeoffs between throughput, loss probability and delay to suit different service requirements

Dbase Software Applications for Data Processing in the Car Rental PT. Duabe

Basically every rental is a work unit which has functions to collect, maintain, and utilize the rental car which was then given to service users. One of the factors that influence for an establishment engaged in the rental is the number of cars that want to use. because the number of stock cars that will be rented out, will greatly assist these efforts in meeting the needs of tenants. Another factor that also influences is how or tools that strongly support the speed and processing research data, transactions and the calculation of complex data on these enterprises, given the increasingly sharp competition berkembangan rental car today. Delays in producing reports that are treated, both on the vehicle, the tenant or transaction is the most common problem encountered in the car rental business. damage or loss of a device resulted in changes to the report of a bundle, not in the days of its existence because at some point will be damaged or missing

BIODIESEL AS A SUBSTITUTE FOR PETROLEUM DIESEL IN A STOCHASTIC ENVIRONMENT

Policy makers should consider price volatility effects when determining appropriate spending levels for alternative fuel programs.Resource /Energy Economics and Policy,

Pemilihan Metode dalam Pembuatan Benda Berbahan Fibreglass

Pemakaian material fibreglass (FRP) pada saat ini berkembang dengan pesat karena material ini bisa menggantikan kedudukan kayu/multiplek dan logam dalam membuat suatu produk. Dalam proses produksi terdapat langkah atau metode untuk menghasilkan suatu produk tersebut, pemilihan metode dalam produksi pada umumnya bertujuan untuk menghemat biaya agar tetap mampu bersaing, penghematan ini mencakup beberapa aspek antara lain dari segi tenaga kerja, mesin, material, dan waktu. Pada proses penghematan/efisiensi suatu produksi dari benda yang berbahan baku fibreglass tentunya tidak boleh mengabaikan akurasi, kekuatan struktur, ketepatan waktu dari suatu produk tersebut sehingga layak untuk digunakan dan pihak owner tidak akan mengalami kekecewaan. Beberapa produk FRP yang telah dihasilkan di UPT BPPH Surabaya ini telah melakukan hal seperti di atas, langkah ini banyak diterapkan terutama pada produk seri dan produk-produk yang akan dilakukan untuk beberapa modifikasi seperti modifikasi model