Judul: Pengaruh Video Bit-rate dan Buffer terhadap Kinerja Progressive Download pada Wireless LAN
Abstrak: Progressive download or HTTP-streaming is a method of sending a file (audio or video) via web server. Progressive download combines the advantages of streaming mode and download mode in terms of time and bandwidth. Progressive download inherets the benefits of download in term of bit-rate utilization and the benefits of streaming in terms of time utilization. It allows the download at much lower bit-rate than the streaming mode and much shorter waiting time than the download mode. Another advantage of progressive download does not require a special streaming server. This research is using video bitrate and buffer as test parameters. Sizes of the video bit-rate are 256 kbps, 512 kbps, 768 kbps and 1024 kbps and the buffer sizes are 1 second, 2 seconds, 3 seconds, 4 seconds, and 5 seconds. Buffer size is set on the media player used by the client. The experiment result shows that the network environment that is needed to support optimum progressive download which has video resolution 640 x 480 pixel are 256 kbps of bitrate and 3 seconds of buffer.
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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: Karakteristik Anatomi Skelet Kepala Badak Jawa (Rhinoceros sondaicus)
Abstrak: Badak jawa (Rhinoceros sondaicus) adalah spesies badak bercula satu yang hidup di Taman Nasional Ujung Kulon (TNUK), Indonesia. Tujuan penelitian ini adalah mempelajari karakteristik anatomi skelet kepala badak jawa yang dikaitkan dengan perilakunya. Penelitian dilakukan dengan mengamati struktur dua buah skelet kepala badak jawa jantan. Skelet kepala diukur dimensi dan volume cavum cranii, dipelajari struktur dan formula giginya, didokumentasi, serta dipindai dengan CT scan. Penamaan unsur-unsur anatomi berdasarkan Nomina Anatomica Veterinaria 2015 dan kemudian struktur anatominya dibandingkan dengan pustaka pada hewan-hewan lain. Secara umum skelet kepala badak jawa memiliki pars splanchnocranii yang sangat berkembang, pars neurocranii yang meninggi ke posterior, dan atap kepala yang konkaf dan tebal disertai simus-sinus di profundal-nya. Skelet kepala badak jawa memiliki permukaan yang kasar pada os incisivum, os nasale, os frontale, dan os maxilla serta memiliki bungkul di os lacrimale dan rigi di os zygomaticum. Selain itu, hewan ini memiliki crista nuchae yang terletak di dorsoanterior condylus occipitalis dan squama occipitalis yang luas dengan persendian occipitoatlantis yang luas di sisi dorsal-nya. Arcus zygomaticus dan fossa temporalis pada hewan ini luas dan berkembang serta angulus mandibularis dan permukaan persendian rahang bawah pada os temporale yang luas. Bagian-bagian tersebut beradaptasi untuk mendukung perilaku badak jawa dalam mencari makan dan bertahan hidup….
Keyword: Javan Rhino, Rhinoceros sondaicus, Skull, Anatomy, Skull anatomy, Rhino behavior, Brain cavity, Internal structure, Darsal roof