Judul: Train Scheduling Using Integer Linear Programming.
Abstrak: Karya ilmiah ini memberikan formulasi masalah penjadwalan kereta api menggunakan model pemrograman linear integer. Penjadwalan kereta api tersebut didasarkan pada jalur tunggal yang menghubungkan antar stasiun. Formulasi yang dibangun bertujuan meminimumkan keterlambatan serta menjamin bahwa tidak ada kereta api yang mengalami tabrakan baik searah maupun berlawanan arah. Input model berupa jadwal keberangkatan kereta api yang direncanakan (aktual), sedangkan outputnya berupa jadwal keberangkatan dan kedatangan kereta api yang faktual.
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Judul: The Rescheduling Principle to Minimize Total Delay on Train with Mixed Integer Linear Programming Method
Abstrak: Salah satu transportasi massa yang cukup diminati masyarakat karena efektivitasnya adalah kereta rel listrik atau biasa dikenal sebagai KRL. KRL tentunya memiliki jadwal tetap yang mengatur perjalanannya. Namun, dalam pelaksanaannya, bukan tidak mungkin akan ada gangguan yang menunda perjalanan kereta. Oleh karena itu, dibutuhkan sebuah sistem untuk menjadwalkan ulang perjalanan kereta. Pada karya ilmiah ini, disediakan sebuah model untuk membentuk jadwal perjalanan baru bagi kereta dengan meminimumkan total waktu keterlambatan. Model tersebut diformulasikan sebagai model Mixed Integer Linear Programming dan diaplikasikan pada jadwal KRL Commuter Line milk PT. KAI menggunakan rute KRL Bogor-Jakarta Kota. Dalam penerapannya, model ini menghasilkan tiga jadwal baru dengan keterlambatan minimum untuk tiga contoh kasus yang telah dibuat., Commuter rail, also known as KRL, has become one of the most preferably mass transportation for its effectiveness. KRL itself surely has a routine schedule to organize its trek every day. But on its implementation, any disruption would blackout the train schedule. Therefore, a system to re-scheduling the train schedule is very needed. On this paper, a model to make a new schedule for the train and minimizing the total delay time is presented. This model is considered as a Mixed Integer Linear Programming model and applicated on KRL Commuter Line’s schedule, using the route of Bogor-Jakarta Kota KRL. On its application, this model generates three new schedules with minimum total delay for three cases provided.
Keyword: mixed integer linear programming, rescheduling, train

Judul: Distribution and Diversity of Ectoparasite Mites on Geckos in Indonesia
Abstrak: Data on the diversity and dispersal of parasitic mites on house geckos in Indonesia are very scarce. In this work, the distribution and diversity of mites living on three species of house geckos, namely Cosymbotus platyurus, Hemidactylus frenatus, and H. garnotii collected throughout Indonesia, has been elaborated. Geckos and mites were captured and immediately preserved in 70% ethanol. Whole mount of the mites was prepared by clearing in lactophenol followed by mounting on polyvinyl lactophenol solutions. The SEM preparation was conducted to examine the detail morphological characters of the mites. The results showed that among 448 individuals of geckos, 221 geckos were infected by Geckobia mites. Prevalences of C. platyurus, H. frenatus, and H. garnotii infested by mites were 14.8%, 50.69%, and 79.6%, respectively. Three different spesies of Geckobia (G1, G2, and G3) could be differentiated; and based on similarities of their morphological characters to ones described in published literatures, Geckobia G2 is Geckobia glebosum and Geckobia G3 is Geckobia bataviensis while G1 could not be identified to the species level. The highest mean intensity of Geckobia G1 infestation was found on H. garnotii (I=7.0), G. glebosum infestation on H. frenatus (I=3.5), and G. bataviensis infestation on H. garnotii (I=11.8). In general, C. platyurus was infested by the least number of mites. Geckobia G1 were found living on the skin folds on the claws, G. glebosum were found mainly on the body and thigh, and G. bataviensis were found on almost all parts of the host’s body. Geckobia mites are distributed randomly throughout Indonesian Archipelago, following the pattern of distribution of their hosts. So it is concluded that Geckobia G1, G. glebosum, and G. bataviensis are sympatric.
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