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: Pengaruh Kekuatan Sinyal terhadap Kinerja Video Streaming pada Jaringan WLAN 802.11b
Abstrak: Along with technological development, many multimedia services on the internet have been developed. One of the services is video streaming. The accessibility is the most advantage of wireless LAN. On the other hand, the Wireless LAN also has problem related to signal strength fluctuation that affect to the quality of streaming video transmitted. The quality of the signal strength has an important role in obtaining a good quality of streaming video. The quality of the signal strength is classified into four categories based on the percentage of received signal on the client side. The categories are Excellent (signal strength > 75%), Good (signal strength 45% - 75%), Fair (signal strength 20% - 45%) and Poor (signal strength < 20%). This research aims to analyze the impact of signal strength degradation to the quality of streaming video on various video bit-rates. The bit-rates are 256 Kbps, 512 Kbps, 768 Kbps and 1024 Kbps. The addition of background traffic is intended to test the streaming service on the busy network. The results showed that video streaming was running well if the signal strength is above 20%. Addition of 5 Mbps network load to the video streaming bit-rate is above 768 Kbps leaded the PLR to the value above 5 %. However the video quality resulted is still acceptable to the human visual system.
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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