Judul: Penjadwalan Proyek Menggunakan Metode Aljabar Max-Plus: Studi Kasus pada Pemasangan Pengolah Air PDAM Kota Semarang.
Abstrak: Project scheduling is part of the project management which planning the implementation of activities in a project in a structured manner and have a clear time limitation. The linkage among activities in a project can be transformed into the form of matrix which can be analyzed by using max-plus algebraic method. This matrix will then be applied in the calculation to obtain the required solution of the project scheduling, such as the optimum time, critical path, and a time tolerance.
Keyword: Max-Plus algebra, project scheduling, optimum time, critical path

Judul: Analisis Perbandingan Durasi Penjadwalan Proyek antara Metode CPM dan PERT  pada Pembangunan Gedung Business Center Pertamina Jakarta
Abstrak: Dalam proyek konstruksi sering terjadi ketidaksesuaian antara jadwal perencanaan dengan realisasinya di lapangan yang akan menyebabkan keterlambatan dalam sebuah proses pembangunan. Oleh karena itu, dibutuhkan analisis perbandingan durasi penjadwalan proyek menggunakan metode CPM dan PERT dengan bantuan aplikasi Microsoft Office Project. Penelitian ini bertujuan untuk menentukan jalur kritis, durasi percepatan, serta persentase probabilitas yang dihasilkan dengan kedua metode tersebut pada Gedung Business Center Pertamina Jakarta. Setelah dilakukan analisis durasi penjadwalan didapatkan jalur kritis yang dilalui dari pekerjaan tanah (A), pekerjaan beton (B), pekerjaan penyelesaian (H), dan pekerjaan elektronik (P) dengan total float = 0. Selain itu, didapatkan pada metode CPM durasi yang dihasilkan adalah 364 hari sedangkan pada metode PERT sebanyak 378 hari. Lalu, nilai persentase probabilitas yang dihasilkan didapatkan bahwa bahwa proyek ini selesai dalam 399 hari sesuai dengan waktu perencanaan dengan peluang sebesar 99,13% tepat waktu, dalam 356 hari sesuai dengan metode CPM sebesar 27,76% tepat waktu, dan dalam 378 hari sesuai dengan metode PERT sebesar 72,24% tepat waktu., In construction projects, discrepancies often occur between the planning schedule and its realization in the field, which will cause delays in the construction process. Therefore, a comparative analysis of project scheduling duration using the CPM and PERT methods with the help of the Microsoft Office Project application is needed. This research aims to determine the critical path, acceleration duration, and probability percentages generated using these two methods at the Pertamina Jakarta Business Center Building. After analyzing the scheduling duration, it was found that the critical path for earthwork (A), concrete work (B), finishing work (H), and electronic work (P) was obtained with a total float = 0. In addition, the CPM method obtained a duration that was the result is 364 days while the PERT method is 378 days. Then, the resulting probability percentage value shows that this project was completed in 399 days according to the planning time with a chance of 99.13% on time, in 356 days according to the CPM method of 27.76% on time, and in 378 days according to with the PERT method 72.24% on time.
Keyword: Acceleration duration, CPM, Critical path, PERT, Probability percentage

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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