Judul: Kondisi Tingkat Risiko Gangguan K3 dalam Kegiatan Pengelolaan Hutan Menggunakan Pendekatan Remote Sensing di RPH Takokak, KPH Sukabumi
Abstrak: Hutan Indonesia dikenal memiliki keanekaragaman tinggi dan berperan penting bagi kehidupan manusia sehingga perlu dikelola secara lestari. Pengelolaan hutan lestari tidak hanya memperhatikan aspek produktivitas tetapi menuntut perlindungan Keselamatan dan Kesehatan Kerja (K3). Remote sensing dimanfaatkan dalam memberikan informasi mengenai sumber bahaya menggunakan data geospasial untuk menganalisis tingkat risiko gangguan K3 dalam kegiatan pengelolaan hutan di RPH Takokak, KPH Sukabumi. Terdapat enam sumber bahaya sebagai parameter yaitu kemiringan lereng, ketinggian, curah hujan, jenis tanah, kerapatan vegetasi, dan aksesibilitas menggunakan metode skoring serta tingkat kecelakaan kerja yang ditujukan kepada stakeholder melalui metode kuesioner. Dari lima kelas klasifikasi, kelas 3 mendominasi lokasi dengan tingkat risiko gangguan K3 sedang yakni seluas 1661,02 ha atau 77,36%, serta seluas 0,49 ha atau 0,02% termasuk dalam kelas risiko 4 dengan tingkat risiko gangguan K3 tinggi. Hasil dan rekomendasi dari penelitian ini diharapkan dapat memberikan informasi kepada Perum Perhutani dalam mengelola kawasan hutan khususnya manajemen risiko dan dapat menjadi acuan untuk penelitian selanjutnya. Kata kunci: kecelakaan kerja, keselamatan dan kesehatan kerja, remote sensing, Indonesian forests are known to have high diversity and play an important role in human life, so they need to be managed sustainably. Sustainable forest management does not only pay attention to productivity aspects but also demands protection of Occupational Safety and Health (OSH). Remote sensing is used to provide information about hazard sources using geospatial data to analyze the level of risk of OSH disturbance in forest management activities at RPH Takokak, KPH Sukabumi. There are six hazard sources as parameters, namely slope, elevation, rainfall, type of soil, vegetation density, and accessibility, as well as the history of work accidents which are addressed to forest management stakeholders through the questionnaire method. From the five classification classes, it was found that the study location was dominated by class 3 classification or had a moderate level of risk of OSH disturbances with an area of 1.661,02 ha or 77.36%, and an area of 0.49 ha or 0.02% included in risk class 4 or had a high level of risk of OSH disturbances. The results and recommendations of this study are expected to provide information to Perum Perhutani in managing forest areas, especially risk management and can become a reference for further research. Keywords: occupational safety and health, remote sensing, work accident
Keyword: Risiko, Remote Sensing, Keselamatan dan Kesehatan Kerja, occupational safety and health, remote sensing, work accident

Judul: Analisis Iklim Keselamatan Kerja pada Kegiatan Pengelolaan Hutan di KPH Bogor, Jawa Barat
Abstrak: Kegiatan pengelolaan hutan mempunyai risiko tinggi terkena gangguan Kesehatan dan Keselamatan Kerja (K3), yang dipicu oleh sumber bahaya atau karakteristik pekerjaan kehutanan. Karena itu, perlindungan K3 pada pekerja kehutanan perlu dilakukan yaitu dengan meningkatkan iklim keselamatan kerja. Penelitian ini bertujuan untuk mengidentifikasi hubungan keterikatan antar dimensi iklim keselamatan, mengukur nilai iklim keselamatan pada kegiatan pengelolaan hutan di KPH Bogor, serta merekomendasikan strategi peningkatan iklim keselamatan yang tepat. Instrumen yang digunakan pada penelitian yaitu Nordic Occupational Safety Climate Questionnaire (NOSACQ-50) yang terdiri dari tujuh dimensi iklim keselamatan. Dimensi 1–3 merupakan penilaian terhadap kebijakan, prosedur, dan praktik keselamatan manajemen dan dimensi 4–7 merupakan penilaian terhadap penanganan keselamatan pekerja. Hasil analisis PLS-SEM menunjukkan bahwa dimensi 1, 2, dan 3 berpengaruh terhadap dimensi 4, 5, 6, dan 7. Hasil analisis iklim keselamatan menunjukkan terdapat perbedaan persepsi antara pekerja dan manajerial. Manajerial menganggap dirinya dan pekerja sudah cukup baik, sedangkan pekerja menganggap manajerial dan dirinya sendiri belum cukup baik dan perlu adanya suatu perbaikan. Strategi peningkatan iklim keselamatan dirumuskan berdasarkan hasil analisis PLS-SEM dan nilai iklim keselamatan rendah yaitu dengan memperkuat dimensi 1, 2, dan 3. Strategi ini berfokus pada peran manajerial terhadap perlindungan K3 pekerja., Forest management activities has a high risk of being affected by Occupational Safety and Health (OSH) disorders, which are triggered by hazard sources or characteristics of forestry work. Therefore, it’s necessary to protect OSH for forestry workers by increasing the work safety climate. This study aims to identify the interrelationships between the dimensions of safety climate, measure the value of the safety climate in forest management activities in KPH Bogor, and recommend appropriate safety climate improvement strategies. The instrument used in this study is the Nordic Occupational Safety Climate Questionnaire (NOSACQ-50) which consists of seven dimensions of safety climate. Dimensions 1–3 are an assessment of management safety policies, procedures and practices and dimensions 4–7 are an assessment of worker’ handling of safety. The results of the PLS-SEM analysis show that dimensions 1, 2, and 3 have an effect on dimensions 4, 5, 6, and 7. The results of the safety climate analysis show that there are differences in perceptions between workers and managers. Managers consider themselves and workers to be quite good, while workers consider managerial and themselves not good enough and need improvement. The safety climate improvement strategy is formulated based on the results of the PLS-SEM analysis and the low safety climate value is by strengthening dimensions 1, 2, and 3. This strategy focuses on managerial roles in protecting workers’ OSH.
Keyword: iklim keselamatan, keselamatan dan kesehatan kerja, NOSACQ-50, pengelolaan hutan, PLS-SEM

Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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