Judul: Penjadwalan Karyawan Menggunakan Integer Linear Programming: Studi Kasus di Taman Air Tirtamas Palem Indah Jakarta.
Abstrak: Taman Air Tirtamas adalah taman wisata air yang memiliki sejumlah karyawan dengan beberapa pembagian tugas. Penjadwalan karyawan merupakan permasalahan yang sering dihadapi oleh pengelola Taman Air Tirtamas Palem Indah. Peraturan yang telah ditetapkan oleh pihak Taman Air Tirtamas Palem Indah dan faktor-faktor lain, seperti banyaknya karyawan yang tersedia di perusahaan tersebut, banyaknya hari bertugas karyawan, banyaknya karyawan yang dibutuhkan untuk setiap jenis pekerjaan menjadi faktor penentu dalam penjadwalan. Permasalahan penjadwalan di Taman Air Tirtamas Palem Indah ini dapat dimodelkan sebagai masalah integer linear programming (ILP). ILP merupakan teknik optimasi dengan fungsi objektif linear, fungsi kendala linear, dan variabel berupa bilangan bulat. Masalah penjadwalan karyawan ini dirumuskan dengan fungsi objektif meminimumkan biaya untuk upah karyawan. Tulisan ini membahas formulasi masalah penjadwalan karyawan dalam bentuk ILP dengan mengambil kasus di Taman Air Tirtamas Palem Indah, Jakarta. Model diselesaikan dengan bantuan software LINGO 11.0.
Keyword: integer linear programming, penjadwalan karyawan, Taman Air Tirtama

Judul: Penjadwalan Perawat Rumah Sakit Menggunakan Integer Linear Programming
Abstrak: Dampak dari Pembatasan Sosial Berskala Besar diperlukannya penjadwalan ulang staf/personel dari jadwal yang sudah ada. Penjadwalan perawat merupakan masalah penting bagi rumah sakit, sehingga diperlukan pengelolaan penjadwalan yang tepat. Penjadwalan secara otomatis dapat dilakukan dengan bantuan software seperti LINGO. Dalam karya ilmiah ini, permasalahan penjadwalan dapat dimodelkan sebagai masalah integer linear programming lalu akan dibuat ke dalam 5 skenario berbeda. Fungsi objektifnya adalah meminimumkan biaya keseluruhan yang harus dikeluarkan Rumah Sakit sesuai dengan peraturan atau kendala yang ada di rumah sakit. Penjadwalan dengan lima skenario akan dimasukkan ke dalam proses komputasi dan diselesaikan dengan bantuan software LINGO 18.0, The impact of large-scale social restrictions necessitates rescheduling of staff or personnel from the existing schedule. Nurse scheduling is an important issue for hospitals, so proper scheduling management is needed. Automatic scheduling can be done by software such as LINGO. In this scientific paper, scheduling problems can be modeled as integer linear programming problems and then divided into 5 different scenarios. Its objective function is to reduce the overall costs must be incurred by the hospital with the hospital's regulations or constraints. Scheduling with five scenarios will be included in the computation process and solved with software LINGO 18.0.
Keyword: Hospital, Integer Linear Programming, Nurse Scheduling

Judul: DNA Extraction and Characterization of Salmonella‟s Lytic Bacteriophage Genome
Abstrak: Bacteriophages are ubiquitous in nature and are known to proliferate wherever their bacterial hosts exist. Their virion particles can exist independently outside the host, however all phages are need their host to propagate. Several phages are highly specific to host cell surface receptors and any slight changes in structure results in little or no interaction between the phage and its host. Salmonella‟s phage isolated from sewage water where their bacteria exist. Three isolated of phages (phages 15, 19 and 38) were used in this research that concentrated using three types of methods. PEG/ NaCl method was firstly used to concentrate the phages based on their molecular weight to precipitate the phage particles during centrifugation. The second method was Scraping Plaque method. In this method, overlay plaques were scraped and collected in SM buffer to get phage concentrates. Enrichment method was the last method used to concentrate the phages. Phage genome isolation was done using two methods i.e. EDTA/SDS and Proteinase K methods. The first method was done using DNase I to eliminate bacterial DNA followed by SDS/EDTA treatment to release phages DNA and phenol-chloroform-isoamyl alcohol to extract the DNA. DNA was collected by isopropanol extraction. While in Proteinase K method, bacterial DNA was eliminated by DNase I and Proteinase K/SDS was used to degrade phages capsids and ethanol for DNA precipitation. The result showed that PEG/NaCl method resulted the highest phage concentration for phage 15 and phage 19, while scrapping method was the highest for phage 38. The quantity and purity of extracted DNA were low for PEG/NaCl and Scraping methods, while Enrichment method was higher indicated higher purity. Run on agarose gel electrophoresis of extracted DNA confirmed that Enrichment method results were the best while scraping and PEG/NaCl method was appeared smear background. Based on DNA genome size determination, the bacteriphages of Salmonella sp were comparable with other study of Salmonella phages. Phage P15 with genome size of 39,5 kb was close to phage epsilon15. Phage P19 with genome size of 41 kb was close to phage ST160. And phage P38 with genome size of 48,5 kb was close to phage Gifsy-1.
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