Judul: Perencanaan Kapasitas Untuk Kinerja Web Dan Proxy Server IPB Menggunakan Model Open Queueing Network M/M/2 dan M/M/1
Abstrak: Penelitian ini bertujuan untuk melakukan perencanaan kapasitas terhadap web server dan proxy server yang dimiliki oleh IPB. Dari beberapa web server dan proxy server yang dimiliki oleh IPB, penelitian ini difokuskan pada web server (www.ipb.ac.id) dan proxy server (proxy1.ipb.ac.id atau 172.17.0.11) utama IPB. Kondisi jaringan IPB saat ini menggunakan model jaringan antrian yang bersifat terbuka (open queuing network model) dan heterogen dengan model M/M/2 dan M/M/1 masing-masing untuk web server dan proxy server IPB. Pada penelitian ini dilakukan pengukuran kuantitatif pada web server IPB yang meliputi utilisasi CPU server secara keseluruhan, utilisasi CPU untuk request web, dan rata-rata penggunaan memori. Sedangkan proxy server IPB dilakukan pengukuran kinerja meliputi utilisasi CPU secara keseluruhan, utilisasi CPU untuk Squid, utilisasi CPU untuk request, hit request pengguna ke proxy server.
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Judul: Peningkatan Kualitas Layanan Website IPB Menggunakan Load Balancing dan Mirorring
Abstrak: Bogor Agricultural University (IPB) uses website as media to promote all of it's activities and events to the academic community and world wide. Currently, IPB website using a single server to serve requests from the user. The use of a single server is not powerful enough to serve huge request at the same time, This research implements load balancing and mirroring mechanism to distribute workload to some server ofIPB website. Load balancing method implemented was dedicated load balancing at IP level used L VS software with Network Address Translation distribution method. Implementation was build in virtual network used VMWare virtual machine to solve the hardware limitation and to reduce risk. Mirroring method used was mixed of time base and event base mirroring. File synchronization used time base mirroring, whereas database synchronization used event base mirroring. The result of this research showed that the implementation of load balancing and mirroring mechanism has been proven in upgrading the web server reliability, scalability, and availability. Goodput of LVS was better than single server system. Response time and request loss L VS were lower than single server. In L VS system, CPU and memory utilization on both of web server were almost equal. It indicated that the director distributed workload to web servers fairly. Duration of take over director was less than 2 second that still achieved Cisco standard in RFC 2281, the recommended time of take over director was not be more than 10 second. On the other hand, the duration of take over web server was approximately 21 second.
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Judul: Isolasi senyawa sinamaldehida dari minyak kulit kayu manis sedagai antioksidan
Abstrak: Cinnamaldehyde is a major essential oil component of cinnamon bark. Cinnamon oil was isolated by using water distillation method that yielded 0.93% (w/w) or 0.95% (v/w). Gas chromatography mass spectrometry (GCMS) of cinnamon oil showed that the main component of the oil is a trans-cinnamaldehyde 32.8% and 3-phenyl-2-propenal 22.9%. The oil was further isolated for cinnamaldehyde by using preparative thin layer chromatography method at Rf of 0.62. GCMS analysis showed that cinnamaldehyde content was 89.1%. Furthermore, the cinnamaldehyde was tested for its antioxidant activity. The isolated product has antioxidant activity with IC50 of 5.06 mg/L as compared with positive control using butylated hydroxytoluene, which has the activity of 10.4 mg/L.
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