Judul: Analisis Pengaruh Video Bit-Rate dan Resolusi Video terhadap Kinerja Live Streaming
Abstrak: The principle of live streaming is to deliver recording media streaming directly from a device to a client who asks, without saving the recording media in to the client’s storage. The quality of live streaming is influenced by several factors, among which are the resolution, video bit-rate and network conditions. This research is expected to give a performance of live streaming technology to limit the resolution and video bit-rate of 802.11 g wireless network for two different players. Video results processed at the broadcaster recording using MPEG-4 H.264 and AAC audio format. The resolutions used are 176x144 pixel, 320x240 pixel and 640x480 pixel. Video bit-rates used are 256 Kbps, 512 Kbps, 768 Kbps and 1024 Kbps. The analysis was done by performing capture streaming service on the server side. The analysis includes the performance parameters of throughput and delay packet. The result is video with resolution 320x240 pixel is the best resolution and is able to adapt to different video bit-rate. However, the result in the network load is not too different both from the broadcasters to the server or from server to the client.
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Judul: Analisis Pengaruh Spesifikasi Video Terhadap Kinerja Video Streaming pada Jaringan Mobile Interne
Abstrak: Nowadays, GSM network Infrastructure has reach the 3G or UMTS (Universal Mobile Telecommunications System) and 3.5G or HSDPA (High-Speed Downlink Packet Access), allowing the end-user streams multimedia content. The availability of network infrastructure and support does not mean that multimedia streaming is free from problem. Its main limitation is the instability of wireless network which resulted in quality degradation of the multimedia streaming. To address these problems, many of the multimedia video are made with low resolution, low frame-rate and low bit rate. This study used the latest H.264/AVC video encoding which makes multimedia streaming service possible to be performed without reducing the quality of the video. Even with the low video specification, the end-users still receive a good video display and good Quality of Service (QoS) in video streaming. There are two test case in this research which represent 2 (two) conditions of the video streaming users. The first test case simulates a situation where the user is sitting still at classroom and the second test case simulates a situation where the user walks around the campus during lunchtime. Based on the analysis of 3 (three) different criteria of QoS in video streaming, that is packet loss, delay and jitter, it was found that the performance of video streaming over the mobile internet is not only influenced by the video specification, but also the condition of the surrounding environment of the end-user. For end-users who were in classroom it is recommended to use low specification video as 320x240 pixel video resolution, frame-rate of 5 fps, and with 24, 56, or 105 kbps of bit-rate. Meanwhile, end-users who were on the outside of the class can access the video with high specifications such as video with 480x360 pixel resolution, 15 fps frame-rate, and 24, 56, or 105 kbps of bit-rate.
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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