Judul: Penentuan Jalur Tercepat dan Terpendek Berdasarkan Kondisi Lalu Lintas di Kota Bogor Menggunakan Algoritme Dijkstra dan Algoritme Floyd-Warshall
Abstrak: Bogor is one of the major cities in Indonesia which have congestion problems large enough at some point. The congestion partly caused by the large number of public transport and private vehicles which circulating on the road, both are considered to have exceeded the capacity of the streets of the Bogor city . One alternative that can be offered to deal with this congestion is determine the best path to follow. The best path is the fastest path or the shortest path that used to achieve a place in the Bogor city in accordance with the conditions of the road traffic density. Dijkstra algorithm and Floyd algorithm Warshal as shortest path algorithm which is excellent in providing optimum value is used to support the of the best path with the most optimal travel time. The research resulted in a system that is able to produce the fastest path and the shortest path along with the approximate distance, estimated travel time and time of arrival. The function to determine the fastest path is capable of generating the fastest path adjusted to the results of the displacement time. Hence, the system always provide the path with the most optimal travel time.
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Judul: Aplikasi Mobile Penentuan Rute Terpendek di Kebun Raya Bogor Menggunakan Algoritme Dijkstra
Abstrak: Bogor Botanical Gardens (BBG) has many trees, plant collections, and points of interest which located in a wide area around 87 hectares. In addition, BBG also has a museum building, laboratory, and many important places which give difficulty for a person to reach those location. Because of the distance of each location, navigation or guide becomes essential for travelers who want to looking around BBG with optimum time. These problems can be solved by graph modelling to determine the shortest route from each location using Dijkstra algorithm. Based on the results of comparative testing in applications with spacing distance pedometer difference obtained an average error distance is 65.3 meters, this is because the location coordinate data obtained from different Google Maps with location coordinates of the received GPS signal while in KRB on pedometer application.
Keyword: Bogor Agricultural University (IPB), Dijkstra algorithm, shortest path, graphs, navigation

Judul: Synthesis of Apatite - Chitosan Composite Using Duck Eggshell and Chitosan with Temperature and pH Control
Abstrak: Composite of apatite-chitosan was prepared by using chitosan as polymer matrix. Calcium phosphate was prepared from CaO and (NH4)2HPO4, which the ratio Ca : P had to be 1.67. Chitosan is produced by deacetilase from biopolymer chitin. Duck eggshell (95% CaCO3) as starting material was converted to be calcium oxide (CaO) through calcinations with temperature 1000oC for 5 hours. In-situ and ex-situ methods were prepared from apatite and chitosan (dissolved with acetate acid 2%). Calcium phosphate prepared for bone implantation, but it is too fragile and brittle to be implant into the body. So addition of chitosan can decrease crystalinity and increase mechanic characteristic (tougher). Composite apatite-chitosan was resulted by fast precipitation. Fast precipitation was held in a breaker glass with nitrogen atmosphere, under controlled temperature at 37oC and pH 7, in order to increase amount of hydroxyapatite. Precipitation with CaO which was dropped by (NH4)2HPO4. Hydroxyapatite and chitosan were appearing at samples with in-situ and ex-situ methods which indicating by peak matching of XRD (closed lattice parameter, crystal size), overlapping at FTIR spectra and supporting by SEM picture (homogenous and agglomerated particle). However, it still needs further research to examine biocompatibility osteoconductive degree of sample by in-vivo and in-vitro test.
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