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: Permormance analysis of web server load balancing with dynamic ratio algorithm
Abstrak: Seiring dengan meningkatnya kebutuhan akan penggunaan sumber daya yang ada di dalam jaringan komputer, teknologi jaringan juga semakin berkembang. Load balancing merupakan salah satu teknik routing yang dapat memanfaatkan beberapa sumber daya untuk dapat digunakan secara bersamaan. Ketika permintaan dari pengguna meningkat maka server akan terbebani karena harus melayani permintaan tersebut. Tujuan dari penelitian ini adalah membangun load balancer yang dapat membaca ketersediaan resource pada server. Pembagian request dilakukan dengan mempertimbangkan informasi resource sever tersebut, yang terdiri dari CPU, memory, dan disk. Algoritme penjadwalan yang digunakan adalah rasio dinamis dan sebagai algoritme pembandingnya adalah round robin. Hasil penelitian menunjukkan bahwa algoritme rasio dinamis bekerja lebih optimal dibandingkan dengan algoritme round robin. Algoritme rasio dinamis mampu meningkatkan throughput, meminimalkan waktu tanggap, dan menghindari overload., The increasing demand of the computer network resources usages has triggered the development of networks technology. Load balancing is one of the routing technique that can utilize multiple resources simultaneously. When the requests from the users increase, the server will be burdened for giving response to that requests. The purpose of this research is to build a load balancer that can read the servers’ resource availabilities. Based on these information, the requests distribution is performed by considering the resources such as CPU, memory, and disk. Dynamic ratio is used as the schedulling algorithm and compared with round robin algorihtm. The results will be compared to the one of round robin algorithm. The results showed that the dynamic ratio algorithm works more optimal than round-robin algorithm. Dynamic ratio algorithm is able to improve the throughput, minimize the response time, and avoid overload.
Keyword: load balancing, rasio dinamis, round robin, server

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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