walfa hidayat - Academia.edu (original) (raw)
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Papers by walfa hidayat
Networks This paper presents a new group communication scheme, roamingcast, for collaborative inf... more Networks This paper presents a new group communication scheme, roamingcast, for collaborative information processing in wireless sensor networks.' Roamingcast enables efficient communication among a subset of mobile terminals in a collaboration group. Unicast and multicast communication can be considered as special cases of roamingcast in which the subset contains one and all group members, respectively. We propose a Roaming Hub Based Architecture (RoamHBA, pronounced as 'rumba') as one solution to support roamingcast. We present the distributed construction and dynamic update of a multicast tree, referred as the roaming hub. This roaming hub has the property that an average pair of terminals communicate using the hub with only constant degradation in path length compared to the best possible path. We have developed network layer protocols implementing this mechanism and evaluated their performance in comparison with roaming restricted flooding. We simulated our design u...
Proceedings IEEE 24th Annual Joint Conference of the IEEE Computer and Communications Societies.
We present Gradient Landmark-Based Distributed Routing (GLIDER), a novel naming/addressing scheme... more We present Gradient Landmark-Based Distributed Routing (GLIDER), a novel naming/addressing scheme and associated routing algorithm, for a network of wireless communicating nodes. We assume that the nodes are fixed (though their geographic locations are not necessarily known), and that each node can communicate wirelessly with some of its geographic neighbors-a common scenario in sensor networks. We develop a protocol which in a preprocessing phase discovers the global topology of the sensor field and, as a byproduct, partitions the nodes into routable tiles-regions where the node placement is sufficiently dense and regular that local greedy methods can work well. Such global topology includes not just connectivity but also higher order topological features, such as the presence of holes. We address each node by the name of the tile containing it and a set of local coordinates derived from connectivity graph distances between the node and certain landmark nodes associated with its own and neighboring tiles. We use the tile adjacency graph for global route planning and the local coordinates for realizing actual inter-and intra-tile routes. We show that efficient loadbalanced global routing can be implemented quite simply using such a scheme.
ABSTRAK Penelitian ini bertujuan mengetahui efek patofisiologi infeksi jamur penyebab dermatofito... more ABSTRAK Penelitian ini bertujuan mengetahui efek patofisiologi infeksi jamur penyebab dermatofitosis pada kucing kampung (Fellis domesticus) di Kecamatan Syiah Kuala, Banda Aceh. Penelitian ini menggunakan 10 ekor kucing kampung yang terinfeksi dermatofitosis. Setiap sampel diambil darah perifer di daerah yang terinfeksi dermatofitosis. Sampel darah segar diteteskan pada gelas obyek dan dibuat preparat apus. Preparat apus tersebut dikering anginkan dan difiksasi dengan methanol 10% selama 3-5 menit, dibiarkan mengering di udara. Preparat kemudian diwarnai dengan larutan Giemsa selama 30 menit. Selanjutnya preparat dicuci dengan aquades dan dibiarkan mengering. Setelah kering, preparat dihitung di bawah mikroskop dengan perbesaran 1000x. Setiap jenis leukosit menggunakan blood counter tabulator. Sel yang dihitung paling sedikit 100 sel, dan dilakukan perhitungan persentase jenis leukosit. Hasil penelitian menunjukkan terjadinya peningkatan monosit dan eosinofil pada perhitungan jumla...
Networks This paper presents a new group communication scheme, roamingcast, for collaborative inf... more Networks This paper presents a new group communication scheme, roamingcast, for collaborative information processing in wireless sensor networks.' Roamingcast enables efficient communication among a subset of mobile terminals in a collaboration group. Unicast and multicast communication can be considered as special cases of roamingcast in which the subset contains one and all group members, respectively. We propose a Roaming Hub Based Architecture (RoamHBA, pronounced as 'rumba') as one solution to support roamingcast. We present the distributed construction and dynamic update of a multicast tree, referred as the roaming hub. This roaming hub has the property that an average pair of terminals communicate using the hub with only constant degradation in path length compared to the best possible path. We have developed network layer protocols implementing this mechanism and evaluated their performance in comparison with roaming restricted flooding. We simulated our design u...
Proceedings IEEE 24th Annual Joint Conference of the IEEE Computer and Communications Societies.
We present Gradient Landmark-Based Distributed Routing (GLIDER), a novel naming/addressing scheme... more We present Gradient Landmark-Based Distributed Routing (GLIDER), a novel naming/addressing scheme and associated routing algorithm, for a network of wireless communicating nodes. We assume that the nodes are fixed (though their geographic locations are not necessarily known), and that each node can communicate wirelessly with some of its geographic neighbors-a common scenario in sensor networks. We develop a protocol which in a preprocessing phase discovers the global topology of the sensor field and, as a byproduct, partitions the nodes into routable tiles-regions where the node placement is sufficiently dense and regular that local greedy methods can work well. Such global topology includes not just connectivity but also higher order topological features, such as the presence of holes. We address each node by the name of the tile containing it and a set of local coordinates derived from connectivity graph distances between the node and certain landmark nodes associated with its own and neighboring tiles. We use the tile adjacency graph for global route planning and the local coordinates for realizing actual inter-and intra-tile routes. We show that efficient loadbalanced global routing can be implemented quite simply using such a scheme.
ABSTRAK Penelitian ini bertujuan mengetahui efek patofisiologi infeksi jamur penyebab dermatofito... more ABSTRAK Penelitian ini bertujuan mengetahui efek patofisiologi infeksi jamur penyebab dermatofitosis pada kucing kampung (Fellis domesticus) di Kecamatan Syiah Kuala, Banda Aceh. Penelitian ini menggunakan 10 ekor kucing kampung yang terinfeksi dermatofitosis. Setiap sampel diambil darah perifer di daerah yang terinfeksi dermatofitosis. Sampel darah segar diteteskan pada gelas obyek dan dibuat preparat apus. Preparat apus tersebut dikering anginkan dan difiksasi dengan methanol 10% selama 3-5 menit, dibiarkan mengering di udara. Preparat kemudian diwarnai dengan larutan Giemsa selama 30 menit. Selanjutnya preparat dicuci dengan aquades dan dibiarkan mengering. Setelah kering, preparat dihitung di bawah mikroskop dengan perbesaran 1000x. Setiap jenis leukosit menggunakan blood counter tabulator. Sel yang dihitung paling sedikit 100 sel, dan dilakukan perhitungan persentase jenis leukosit. Hasil penelitian menunjukkan terjadinya peningkatan monosit dan eosinofil pada perhitungan jumla...