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: Labour Management of Oil Palm Plantation (Elaeis guineensis Jacq.) at Negeri Lama Selatan Estate, PT Hari Sawit Jaya, Labuhanbatu, North Sumatera.
Abstrak: Pengelolaan tenaga kerja yang baik merupakan salah satu kunci keberhasilan perkebunan kelapa sawit. Kegiatan magang dilakukan mulai bulan Januari hingga bulan Mei 2022 di PT Hari Sawit Jaya, Labuhanbatu, Sumatera Utara. Kegiatan magang dilakukan secara langsung sebagai pekerja harian lepas (PHL), pendamping mandor, dan pendamping asisten untuk mempelajari aspek teknis dan aspek manajerial di kebun. Manajemen tenaga kerja merupakan aspek khusus yang diamati dalam kegiatan magang. Hal yang diamati dalam aspek khusus meliputi pengorganisasian tenaga kerja, prestasi kerja, disiplin dan kualitas tenaga kerja serta penerapan Indonesian Sustainable Palm Oil (ISPO) pada perkebunan terkait prinsip dan kriteria ISPO yang ke-5 tentang tanggung jawab tenaga kerja. Tenaga kerja di Kebun Negeri Lama Selatan, PT Hari Sawit Jaya terdiri dari karyawan staf dan non staf. Hasil pengamatan selama magang menunjukkan bahwa perusahaan telah melakukan sistem penerimaan kerja karyawan yang baik. Kualitas kerja pemanen umumnya sudah sesuai dengan standar perusahaan. PT Hari Sawit Jaya telah menerapkan prinsip dan kriteria ISPO ke-5 tentang tanggung jawab terhadap pekerja dengan memberikan fasilitas sarana dan prasarana untuk kesejahteraan dan kesehatan pekerja serta menyediakan alat pelindung diri (APD) untuk keselamatan kerja. Kata kunci : ISPO, kualitas kerja, prestasi kerja, Good fieldworker management is one of the key successes of palm plantations. The internship was held from January until May in PT Hari Sawit Jaya, Labuhanbatu, North Sumatra. The internship had been conducted by working directly as a daily worker, accompanying a field supervisor, and accompanying an afdeling assistant (division head) to learn technical and managerial aspects. Fieldworker management was the focus of the internship activity. The observed thing on the focus internship included fieldworker organizing, work performance, discipline and quality of work, and practice of Indonesian Sustainable Palm Oil (ISPO) in oil palm plantations to relate with the 5th principles and criteria ISPO about fieldworker responsibility. Fieldworker in Negeri Lama Estate, PT Hari Sawit Jaya categorized as staff and non-staff worker. The results showed that the company has implemented a good employee recruitment system. The harvester’s quality in PT Hari Sawit Jaya has implemented the principle and criteria of the company’s standards. PT Hari Sawit Jaya has complied with the 5th principle and criteria of ISPO about fieldworker responsibility by providing facilities and infrastructure for the prosperity and health of workers and also providing personal protective equipment (PPE) for work safety. Keywords: ISPO, quality of work, work performance.
Keyword: ISPO, quality of work, work performance

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