Judul: Analisis Kinerja RSVP dan RTP Header Compression untuk Video Streaming
Abstrak: Video streaming is a real-time application that is sensitive to delays. Some methods like Differentiated Service (DiffServ), Resource Reservation Protocol (RSVP), and Real-time Transport Protocol (RTP) header compression are used to ensure Quality of Service (QoS) of the network to work well. The purpose of this research is to analyze the performance of RSVP and RTP header compression for video streaming. RSVP enables the receiver of a traffic flow to make the resource reservations necessary to ensure that the receiver obtains the desired QoS for the traffic flow. RTP header compression compresses the RTP header which consists of the combined Internet Protocol (IP), User Datagram Protocol (UDP) and RTP segments. Routing protocol is one of the important things to maintain communication within network. The routing protocol used in this research is Enhanced Interior Gateway Routing Protocol (EIGRP). Streaming ran in unicast using the on-demand streaming method. Test was conducted by using actual devices, i.e., five CISCO router 2620XM that is connected by serial cables with a small topology. This research analyzes the performance of RSVP and RTP header compression based on packet loss, throughput, delta and jitter. The result shows that RSVP and RTP header compression are capable of improving the performance of the network for video streaming. RSVP is better than RTP Header compression and works even better while those two methods are integrated.
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Judul: Kinerja Protokol Routing dalam Komunikasi Real-time pada Jaringan Berkabel
Abstrak: To reach its destination, different routing protocols are used by routers to determine the path for real time data (voice and video) communications. Each protocol has its own method of doing the routing. This research evaluates the performance of three routing protocols, namely RIPv2, EIGRP, and OSPF, based on two parameters: packet loss and router re-convergence time. Test was conducted by using actual devices, i.e., one CISCO 1841 router and eight CISCO 2620XM routers with a small topology. Video file that is used has a duration of 119.25 seconds with video format MPEG-4 and total bit-rate 87.6 Kbps. To obtain the value of packet loss and router re-convergence time, when the stream running about 1 minute, the network will be impaired by turning off one of the router. The analysis was done by looking at the number of packets captured by sniffer and the log of the router. The result shows that protocol EIGRP has the best performance compared with RIPv2 and OSPF with average time 0.148 second to re-convergence and 40 loss packets.
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Judul: Revisi marga Ptychopyxis miquel (Euphorbiaceae) di kawasan Malesia
Abstrak: Ptychopyxis adalah salah satu marga dari 317 marga yang termasuk ke dalam suku Euphorbiaceae. pertama kali dipublikasikan oleh Miquel (1860). Marga ini Marga ini pernah dimasukkan kedalam marga lain, yaitu Podadenia, Mallotus dan Clarorivinia. Fakta tersebut menunjukkan bahwa batasan marga Ptychopyxis belum cukup mantap. Persebaran marga ini menurut Van Welzen (1993) jumpai di Thailand, Indochina dan kawasan Malesia, di seluruhnya ada 23 jenis dan 10 jenis diantaranya terdapat di kawasan Malesia. Marga ini umum berperawakan pohon dan berumah dua, tumbuh di hutan hujan dataran rendah sampai pada ketinggian 1500 m dpl. Penelitian taksonomi yang komprehensif tentang marga ini telah dilakukan oleh Airy Shaw pada tahun 1960; sejak saat itu belum ada penelitian taksonomi yang lebih kompre- hensif, khususnya untuk kawasan Malesia. Kini dengan bertambahnya jumlah spesimen koleksi baru, maka tepatlah kiranya dilakukan revisi marga. Tujuan penelitian ini adalah untuk memberikan batasan marga serta jenis-jenisnya yang termasuk dalam Ptychopyxis selain itu diteliti pula hubungan kekerabatan antar jenis dan keterangan-keterangan..dst
Keyword: Herbarium Bogoriense, Podadenia, Mallotus, Clarorivinia