Judul: Simulasi Virtual Server
Abstrak: Kebutuhan akan tingkat ketersediaan dan skalabilitas yang tinggi dari suatu situs di internet semakin meningkat. Virtual Server (VS) merupakan salah satu solusi untuk meningkatkan tlngkat ketersediaan dan skalabilitas suatu situs internet. Dibangun olcb sekumpulan server yang tertw.bung dalam suatu jaringan. VS memberikan pelayanan seperti halnya single server dalam hal interaksi dengan pengguna. Secara skematis VS terdiri dari dua bagian, yaitu kelompok server yang meiayani permintaan dari pengguna, disebut Real Server (RS) dan server yang rnenet'Uskan pennintaan (request) dari pengguna. disebut Director atau Load Balancer (DIRJ Implementasi VS terdiri dati tiga metodc penerusan paket, Network Address Translation (NAT), Direct Routing (DR) - keduanya diimplementasikan di dalam Local Area Network (LAN), dan IP Tunneling (TUN) yang diimplementasikan di dalam Wide Area Network (WAN), Terdapat delapan algoritma pemilihan RS oteh DIR. tetapi dalam penelitian ini dibatasi menjadi dua yang menganggap semua RS memiliki spesifikasi yang sarna, yaitu Round Robin (RR) dan Least Connection (LC).
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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: Insecticidal Activity of Essential Oils Leaves of Cinnamomum spp. (Lauraceae) against Crocidolomia pavonana and Their Phytotoxicity on Broccoli Seedlings
Abstrak: Essential oils from leaves of 13 species of Cinnamomum were tested for their insecticidal activity on the cabbage head caterpillar Crocidolomia pavonana with leaf immerse method. The results showed that the treatment with 1% (w/v) essential oils leaves of C. celebicum, C. multiflorum, C. sintoc, and C. verum caused 21.45, 93.65, 60.30, and 76.10% mortality, respectively. Based on the results of phytotoxicity and insecticidal activity tests, C. multiflorum oil was further tested at 6 concentration levels. In all treatments, larval mortality has occurred at 24 hours after treatment (HAT) and increased at 48 HAT. LC50 of C. multiflorum oil at 24 and 48 HAT was 0.504 and 0.396%, respectively. The treatment with C. multiflorum oil at ≤0.31% did not inhibit the development of C. pavonana larvae. Determination of the chemical constituents of Cinnamomum oils were carried out by gas chromatography-mass spectrometry (GCMS). Totally, 345 compounds were identified. Methyleugenol constituted the main component (49.4%) of leaf essential oil of C. multiflorum and was assumed to be responsible for the insecticidal activity of the oil against C. pavonana larvae. LC50 of pure methyleugenol obtained at 0.365% (48 HAT) and 0.363% (72 HAT). The results showed that C. multiflorum was more effective with LC50 value equivalent to methyleugenol content of 0.32% (24 HAT) and 0.24% (48 HAT).
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