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: Mercury Toxicity and It’s Effect on Histopathology Change of Nile Tilapia (Oreochromis niloticus).
Abstrak: Nile tilapia (Oreochromis niloticus) is one of fish species that oportunity to contaminated with mercury. The effects of pollutants can damage living organisms organs and can cause death. The effects caused mercury had acute or chronic character. The aims of this study are to determine threshold and acute toxicity of mercury chloride (HgCl2) of Nile tilapia (Oreochromis niloticus), to assess the effect of mercury chloride (HgCl2) on several biometric parameters (survival, growth rate of average daily weighted, liver condition, bile and reproductive variability of Nile tilapia (Oreochromis niloticus), assess the level of damage to the histological structure of the gills, liver and kidney of Nile tilapia (Oreochromis niloticus) caused mercury chloride (HgCl2) exposure. This study was conducted from February to June 2013. Nile Tilapia (Oreochromis niloticus) were used in this study were female with average weight 20 grams or 11-13 cm length range. Toxicant materials used in this study was mercury chloride (HgCl2). Fish were reared in each aquarium 60x40x30 containing 48 liters of water. This study consists of three stages: a preliminary test, acute test, and sub-chronic test. To determine the changes in biometric condition of tilapia approximated by measuring the survival rate (SR), the growth rate of average daily weight , the content of mercury in the fish organs, hepatosomatic index (HSI), the relative bile volume (VER), gonadal soamtic index (IKG), fecundity and oocit diameter, tissue damage caused by mercury in fish organs by making histological preparations stained with hematoxylin and eosin. The median lethal concentration (96 hr, LC50) of Mercury Chloride was calculated as 1,64 mgL--1.The survival rate was highest in the control treatment (46,67 %) . Mercury chloride with concentration 0.196 mgL--1 show significant effect to changes HSI and relative bile volume, and oocyte diameter of Nile tilapia (p < 0,05). Mercury chloride with a concentration of 0,164 mgL-1 and 0,196 mgL-1 have not a significant effect on the growth rate of weight, gonadal somatic index and fecundity of Nile tilapia (p > 0,05). Mercury chloride cause damage to gills (hyperplasia, hypertrophy, proliferation and neukrosis), liver (hyperplasia, hemorhage, shrinkage of hepatocytes, proliferation and neukrosis) and kidney (hyperplasia, hemorrhage, shrinkage of the glomerulus, proliferation and neukrosis).
Keyword: Nile tilapia, Hepatosomatic indexs (HSI), histopathology