Judul: Improving Supervisors' OSH Knowledge Field Supervisors in Logging Operations through Safety Game in BKPH Parung  Panjang KPH Bogor
Abstrak: Keselamatan dan kesehatan kerja (K3) di sektor kehutanan merupakan hal yang sangat penting sebagai bentuk perlindungan terhadap pekerja. Safety game merupakan instrumen yang dibuat oleh Prof. Dr. Efi Yuliati Yovi, S. Hut., M.Life.Env.Sc., terbukti efektif dalam penyebarluasan informasi mengenai K3 bagi pekerja kehutanan. Penelitian ini bertujuan membuktikan pengaruh safety game dalam peningkatan pengetahuan K3 dan mengidentifikasi strategi uji coba safety game yang efektif dalam peningkatan pengetahuan K3 supervisor lapangan di BKPH Parung Panjang melalui metode yang diberikan. Metode yang digunakan dalam penelitian ini adalah metode full set dan half set. Hasil penelitian ini menunjukkan bahwa safety game terbukti meningkatkan pengetahuan yang signifikan tentang K3 terhadap supervisor lapangan setelah lima kali pengulangan permainan. Strategi yang tepat dilakukan yaitu pengelompokkan permainan berdasarkan karakteristik pekerja dengan metode full set atau half set sebagai upaya pengoptimalan program pembelajaran K3. Hasil penelitian ini dapat digunakan sebagai acuan dalam menentukan metode yang tepat dalam meningkatkan pengetahuan K3 sesuai karakteristik pekerja., Occupational safety and health (OSH) in the forestry sector is very important as a form of protection for workers. Safety game is an instrument created by Prof. Dr. Efi Yuliati Yovi, S. Hut., M.Life.Env.Sc., proven effective in disseminating information about OSH for forestry workers. This study aims to prove the effect of safety games in improving OSH knowledge and identify safety game trial strategies that are effective in improving OSH knowledge of field supervisors in BKPH Parung Panjang through the given method. The methods used in this study are full set and half set methods. The results showed that the safety game was proven to significantly increase the OSH knowledge of field supervisors after five repetitions of the game. The right strategy is to group games based on worker characteristics with the full set or half set method as an effort to optimize the OSH learning program. The results of this study can be used as a reference in determining the right method in improving OSH knowledge according to worker characteristics.
Keyword: ergonomi, keselamatan dan kesehatan kerja (K3), pemanenan hutan, ergonomics, forest harvesting, occupational safety and health (OSH)

Judul: Kinerja Safety Game untuk Peningkatan Aspek Pengetahuan K3 Supervisor Lapangan dalam Kegiatan Penebangan di KPH Bogor
Abstrak: One of the jobs in the forest which is continuously exposed to a high accident risk is a timber cutter. The use of a chainsaw for the main wood cutting tool and the process of felling trees may trigger an accident. Focusing on achieving high productivity often makes workers neglect the aspects of OSH, resulting in undesirable accidents, which in the worst case can take lives and bring a big loss to the company where the workers concerned work. Therefore, it is a must for forestry workers to have good knowledge of OSH. And, safety game is actually a learning instrument designed to improve workers’ knowledge on Occupational Safety and Health (OSH) so that they can work safety in the forest. Safety game is a board game that can be played by anyone anytime, and it does not cost a lot of money. This instrument had been proven to be able to increase the knowledge of field supervisors on OSH after the safety game was tested with 5 replications.
Keyword: work accident, safety game, OSH, felling, field supervisor

Judul: Invers Drazin dari Matriks Toeplitz Singular
Abstrak: Matriks Toeplitz adalah matriks yang setiap unsur pada diagonal utama bernilai sama dan setiap unsur pada subdiagonal yang bersesuaian dengan diagonal utama juga bernilai sama. Matriks singular adalah matriks yang tidak bisa ditentukan inversnya. Akan tetapi, dapat diupayakan untuk ditentukan inversnya menggunakan invers matriks yang diperumum. Invers Drazin merupakan salah satu jenis invers matriks yang diperumum. Pada karya ilmiah ini ditentukan invers Drazin dari matriks Toeplitz singular dengan menggunakan metode Leverrier Faddeev. Kemudian, ditentukan invers Drazin dari matriks Toeplitz singular yang direpresentasikan sebagai penjumlahan segitiga bawah dan segitiga atas matriks Toeplitz berdasar pada teorema Gohberg dan Semencul., Toeplitz matrix is a matrix in with element on the main diagonal has the same value and on the subdiagonal corresponding to the main diagonal also has the same value. Singular matrix is a matrix that has no inverse. However, it can be attempted to determine the inverse using a generalized inverse matrix. Inverse Drazin is a type of generalized matrix inverse. This paper discussed the inverse Drazin for a singular Toeplitz matrix using the Leverrier Faddeev method. Then, the Drazin inverse of the singular Toeplitz matrix which is represented as a sum of products of lower and upper triangular Toeplitz matrix based on Gohberg and Semencul theorem.
Keyword: inverse Drazine, singular Toeplitz matrix