Judul: Penjadwalan Kegiatan Belajar Mengajar di Lembaga Bimbingan Belajar dengan Menggunakan Integer Linear Programming dan Weighted Sum Method
Abstrak: This manuscript provides integer linear programming model to schedule teachers in a tutoring agency. The objective function of this model is to maximize students achievement with regard to teacher performance and to minimize the total cost for teachers which includes daily wage costs and transportation costs. These two objective functions are combined into one objective function using a weighted sum method. The model assuming that: (1) the study group has been formed and each group had time and place of teaching and learning activities, (2) it considers time availability of the teachers, (3) a teacher can teach at different locations within a day, (4) there is no time lag between the two time periods of teaching in a day, except the pause for switching locations.
Keyword: weighted sum method., scheduling, integer linear programming, tutoring agency,

Judul: Pemodelan Penjadwalan Kegiatan Belajar Mengajar Menggunakan Integer Linear Programming: Studi Kasus Di Lembaga Bimbingan Belajar Ganesha Operation Bogor
Abstrak: Bimbingan belajar Ganesha Operation Bogor menghadapi masalah setiap semester dalam membuat penjadwalan kegiatan belajar mengajar. Permasalahan ini dapat dimodelkan sebagai masalah Integer Linear Programming (ILP) yaitu masalah optimasi dengan fungsi objektif dan kendala yang linear serta variabel integer. Penelitian ini bertujuan untuk membangun model matematika masalah penjadwalan kegiatan belajar mengajar di Ganesha Operation Bogor ke dalam bentuk ILP dan menentukan penjadwalan terbaik dalam satu semester. Fungsi objektif dari permasalahan ini ialah memaksimumkan banyak pertemuan setiap mata pelajaran dalam satu semester. Kendala dari pemodelan meliputi kapasitas ruang belajar, waktu luang siswa, pengajar dan kendala gedung yang digunakan. Setiap minggu kelompok belajar memunyai jadwal mata pelajaran yang berbeda, serta pengajar yang tidak selalu sama dalam setiap pertemuan untuk mata pelajaran yang sama. Dari proses software LINGO 11.0, nilai total fungsi objektif sebesar 1088 yang menunjukkan bahwa banyaknya penjadwalan maksimum ada 1088 jadwal, sesuai dengan yang diinginkan.
Keyword: Integer, Optimization, Objective function, Constraints, Optimasi, Fungsi objektif, Kendala, Pemrograman linear, Integer programming

Judul: Studi Taksonomi Katak Subgenus Papurana (Lesson, 1831) dari Halmahera (Anura, Ranidae, Hylarana), Studi Taksonomi Katak Subgenus Papurana (Lesson, 1831) dari Halmahera (Anura, Ranidae, Hylarana
Abstrak: I reevaluated taxonomic of subgenus Papurana position from Halmahera based on morphological and molecular analyses. My results show that two separate species occur on the Halmahera Island, each nested within two distinct clades (hereafter papua clade and celebensis clade), one of which corresponds to H. moluccana (celebensis clade) and the other to an unidentified species (papua clade). By p-distance ranging from 6.9 to 11.5% on the 16S rRNA gene, the unidentified species (Hylarana sp.) is genetically different from all congeners of the papua clade. The Hylarana sp. can be distinguished from all congeners by following combination of charactes: vomer teeth in two oblique rows with narrow inter-vomer distance; snout rounded dorsally; dorsum with few scattered cone-shaped tubercles that are black with white tips; distinct skin folds (ridges) on the dorsal side of the thigh coinciding with dark brown cross bars; a marbled pattern on the ventral side of the thigh and yellowish groin. I also present new data for H. daemeli, H. volkerjane, and H. arfaki from the western region of Papua. Furthermore, I found that H. celebensis has numerous mtDNA lineages, indicating cryptic diversity within the celebensis clade. The discovery of two separate species on Halmahera necessitates more research into the biogeographic history of Hylarana in Northern Moluccas.
Keyword: frog, Halmahera, Hylarana, morphology, Papurana, phylogenetic