Judul: Manajemen Tenaga Kerja Perkebunan Kelapa Sawit (Elaeis guineensis Jacq.) di Gunung Alam Estate, PT. Nusantara Sarana Alam, Kalimantan Barat.
Abstrak: Kelapa sawit merupakan komoditas yang penting dalam perekonomian Indonesia. Manajemen tenaga kerja yang baik di perkebunan kelapa sawit diperlukan agar perusahaan mampu menerapkan Indonesian Sustainable Palm Oil (ISPO). Kegiatan magang di Gunung Alam Estate (GAE), PT. Nusantara Sarana Alam (Sampoerna Agro), Kabupaten Landak, Kalimantan Barat bertujuan untuk meningkatkan kemampuan dan keterampilan kerja melalui aspek teknis dan aspek manajerial. Hal yang diamati dalam manajemen tenaga kerja adalah pengorganisasian tenaga kerja, prestasi kerja karyawan, kualitas dan kedisiplinan kerja, penerapan prinsip dan kriteria ISPO tentang tanggung jawab terhadap pekerja. Hasil magang menunjukkan manajemen tenaga kerja perkebunan di GAE sudah mematuhi kriteria ISPO. Pihak manajemen sudah menerapkan aspek berkelanjutan dan tanggung jawab terhadap pekerja.
Keyword: berkelanjutan, disiplin kerja, kesejahteraan tenaga kerja, keselamatan dan kesehatan kerja, kualitas kerja

Judul: Labor Management of Oil Palm Plantation (Elaeis guineensis Jacq.) in Cikasungka Estate under Joint Operation of PTPN III West Java Banten District
Abstrak: Kelapa sawit merupakan sumber devisa terbesar Indonesia dari subsektor perkebunan. Praktik manajemen tenaga kerja yang baik di perkebunan kelapa sawit sangat penting dilakukan agar perusahaan mampu mencapai produktivitas tinggi secara berkualitas dan berkelanjutan. Kegiatan magang di Kebun Cikasungka Kerjasama Operasional (KSO) PTPN III Distrik Jawa Barat Banten bertujuan mendapatkan pengalaman dan kompetensi aspek teknis dan manajerial di perusahaan perkebunan. Kegiatan dan penghimpunan data difokuskan pada aspek khusus manajemen tenaga kerja meliputi pengorganisasian tenaga kerja, prestasi kerja, disiplin dan kualitas kerja, dan penerapan Indonesian Sustainable Palm Oil (ISPO). Hasil magang menunjukkan tenaga kerja Kebun Cikasungka telah bekerja secara disiplin dengan kualitas kerja yang baik. Pihak manajemen Kebun Cikasungka telah menerapkan aspek berkelanjutan dan tanggung jawab terhadap pekerja dengan baik., Oil palm is Indonesia's largest source of foreign exchange from the plantation subsector. Good labor management practices in oil palm plantations are very important so that companies are able to achieve high productivity in quality and sustainability. Internship activities in Cikasungka Estate under Joint Operational (KSO) of PTPN III West Java Banten District aim to gain experience and competence in technical and managerial aspects in plantation companies. Activities and data collection focused on specific aspects of labor management including labor organization, work performance, discipline and work quality, and the application of Indonesian Sustainable Palm Oil (ISPO). The results of the internship show that the Cikasungka Estate labor has worked in a disciplined manner with good work quality. The management of Cikasungka Plantation has implemented sustainable aspects and responsibility for labor well.
Keyword: disiplin kerja, ISPO, kualitas kerja, prestasi kerja

Judul: Dynamical System of Hepatitis B in Three Groups with Vaccination
Abstrak: The aim of this study is to modify the hepatitis B transmission model in three age groups involving vaccination from the model conducted by Zhoe and Zhang.The method used is to analyze the stability of the fixed point and its basic reproduction number (R_0). Performed stability analysis and numerical simulation to see population dynamics. Next, a sensitivity analysis of the parameters was carried out to see its effect on R_0. From the analysis obtained two fixed points, namely non-endemic and endemic fixed points. Non-endemic fixed points are locally asymptotically stable if R_0 <1 Meanwhile, the endemic fixed point is locally asymptotically stable if R_0 > 1. Hepatitis vaccination affects the number of susceptible population, because the more successful the vaccination, the smaller the number of susceptible populations so that the smaller the population will be infected.
Keyword: Dynamic, Hepatitis B, Vaccine, Mathematical model