Keragaman Dan Kelimpahan Sumberdaya Ikan Di Perairan Hutan Mangrove Pulau Unggas Air Bangis Pasaman Barat

Hutan mangrove merupakan ekosistem unik dan mempunyai tiga fungsi pokok yaitu ekologi, fisik dan ekonomi. Di kawasan perairan hutan bakau Pulau Unggas, Air Bangis, Pasaman Barat. Tujuan penelitian ini adalah untuk menentukan keragaman dan kelimpahan sumberdaya perikanan disekitar perairan Pulau Unggas. Alat dan bahan yang digunakan adalah metode survei dari 4 stasiun. Dari sampel ikan yang ditangkap menggunakan alat penangkap ikan monofilamen net dengan ukuran mata jaring 1,5 inchi dan panjang jaring 120 meter. Telah ditemui 7 suku dan 16 jenis ikan yang dominan adalah suku Lutjanidae 4 jenis dan 3 jenis pada suku Carangidae. Dari hasil analisis data didapat nilai indeks keanekaragam 0,452–0,970, kemerataan 0,620–0,950, kekayaan 0,565–1,820 dan kesamaan 0,50–1,334. Dari nilai distribusi alat penangkapan ikan tiap individu didapati nilai rata-rata 0,785

On some generalized ageing orderings

Some partial orderings which compare probability distributions with the expo- nential distribution, are found to be very useful to understand the phenomenon of ageing. Here, we introduce some new generalized partial orderings which de- scribe the same kind of characterization of some generalized ageing classes. We give some equivalent conditions for each of the orderings. Inter-relations among the generalized orderings have also been discussed

Scalable and Cost Efficient Algorithms for Virtual CDN Migration

Virtual Content Delivery Network (vCDN) migration is necessary to optimize the use of resources and improve the performance of the overall SDN/NFV-based CDN function in terms of network operator cost reduction and high streaming quality. It requires intelligent and enticed joint SDN/NFV migration algorithms due to the evident huge amount of traffic to be delivered to end customers of the network. In this paper, two approaches for finding the optimal and near optimal path placement(s) and vCDN migration(s) are proposed (OPAC and HPAC). Moreover, several scenarios are considered to quantify the OPAC and HPAC behaviors and to compare their efficiency in terms of migration cost, migration time, vCDN replication number, and other cost factors. Then, they are implemented and evaluated under different network scales. Finally, the proposed algorithms are integrated in an SDN/NFV framework. Index Terms: vCDN; SDN/NFV Optimization; Migration Algorithms; Scalability Algorithms.Comment: 9 pages, 11 figures, 4 tableaux, conference Local Computer Networks (LCN), class

Ground State Spin Structure of Strongly Interacting Disordered 1D Hubbard Model

We study the influence of on-site disorder on the magnetic properties of the ground state of the infinite U 1D Hubbard model. We find that the ground state is not ferromagnetic. This is analyzed in terms of the algebraic structure of the spin dependence of the Hamiltonian. A simple explanation is derived for the 1/N periodicity in the persistent current for this model.Comment: 3 pages, no figure