Judul: Implementasi Aplikasi Android untuk Pencarian Lokasi WiFi Terdekat dengan Algoritme Haversine dan Great Circle (Studi Kasus: Jaringan Nirkabel IPB)
Abstrak: Teknologi wireless (WiFi) telah menjadi standar dalam dunia teknologi informasi. Pertukaran data melalui media transmisi udara dapat membantu manusia dalam bertukar informasi secara dinamis, fleksibel, dan cepat. Tujuan dari penelitian ini adalah untuk mengembangkan database dan aplikasi berbasis Android untuk mengelola perangkat WiFi. Tujuan tersebut memfasilitasi pengguna untuk memilih koneksi WiFi terbaik di sekitar Institut Pertanian Bogor (IPB). Jarak dan daya transmisi sinyal adalah parameter yang digunakan dalam memilih koneksi terbaik. Informasi jarak dan sistem navigasi menuju titik akses point WiFi dihitung dengan algoritma haversine dan great Circle. Android API menghitung nilai frekuensi dan kekuatan sinyal WiFi. Persentase rasio dari jarak antara haversine dan great circle adalah 61.84%. Pengguna menggunakan rasio tersebut untuk mempertimbangkan posisi terbaik ketika mencari titik akses WiFi. Semua fungsi dalam pengembangan sistem berjalan dengan baik.
Keyword: Android, API, great circle, haversine, WiFi

Judul: Pencarian Jarak Titik Akses Sinyal Wireless Fidelity (WiFi) dengan Location Based Service (LBS) pada Android di Area IPB Darmaga
Abstrak: The WiFi signal access point in IPB Darmaga area is unevenly spread and overlap. Users have difficulties to access it. This research aims to develop a system, namely imWiFi, which can help users accessing WiFi signal in IPB Darmaga. One of the feautures provided by the system is provide the information of the WiFi signal access point distance. The distance information can be yielded by Location Based Services (LBS). LBS used in this research is the LBS services from Google Maps and application of Haversine formula. Comparison between Google Maps and Haversine formula is used to determine percentage of the distance comparison between two different algorithms. The percentage comparison distance between Google Maps and formula Haversine is 64.61% with the error value of 0.8204. The development of the system has successfully implemented three of four principal functions. Thus, 75% of overall systems was successfully developed.
Keyword: WiFi, location based service (LBS), GPS, distance

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