Judul: Prototipe layanan mobile berbasis lokasi memanfaatkan jaringan wireless-fidelity di kampus IPB Darmaga
Abstrak: Wireless-Fidelity (Wi-Fi) was one of technologies on Indoor Positioning Location-based Services (LBS) which was part of the Context-aware System. The LBS‟s applications were commonly found in everyday life, such as Car Navigation and Yellow Pages. The main idea of this prototype development was to create mobile commerce application for IPB‟s facilities on Windows Mobile Professional phone which implemented Context-aware System. The contexts were location, time, user‟s profile, and presence status of the user. The location context retrieved by measuring the signal strength of the access point of the Wi-Fi on a location.The name of the access point with the highest signal then recorded and used as the location context. There were two services of this application, they were product images and the static map images of the facilities.
Keyword: Context-aware system, Location based, Wireless-fidelity, Mobile commerce, Windows mobile, Bogor Agricultural University, Institut Pertanian Bogor, IPB

Judul: Prototype Mobile GIS Kampus IPB Darmaga Menggunakan J2ME, GeoServer, dan Jaringan Wi-Fi
Abstrak: Bogor Agricultural University has a vast land area and identical building shape consisting of nine faculties and thirty eight departments. Many university students, especially freshman who are not familiar with the entire building’s site campus, in particular the location of lecture halls. In order to resolve the issue, a dynamic and accessible Geographic Information Systems for IPB Darmaga campus needs to be built. The aims of this research is to create and display a dynamic map for IPB campus as a mobile-based GIS. The system prototype used J2ME, GeoServer, and the campus Wi-Fi network used for location-based services. The prototype was built as a three-tier system that has three components: the client, the web server, and the database server. The client serves as a presentation tier for running the application. The web server consists of GeoServer as web map server, and Apache web server. GeoServer serves as an application to store and process geospatial data and sends a response in the form of maps and its information to client. A PHP web application serves as the application for processing location data based on SSID Wi-Fi sent by client. System provides functions to select and display map layers, and there are additional menus such as Zoom in, Zoom out, Refresh, Reset view, GetFeatureInfo, the menu to request information about specific features shown on the map, and MyLocation, the menu used to identify user’s location based on Wi-Fi network.
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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