Judul: Study of Occupational Fatigue of Unloading Activities at Brondong Fishing Port, Lamongan, East Java
Abstrak: Aktivitas bongkar kapal perikanan di Pelabuhan Perikanan Nusantara Brondong salah satu aktivitas utama berupa proses memindahkan muatan ikan ke dermaga dan merupakan aktivitas yang memiliki tingkat kecelakaan kerja yang tinggi karena kondisi lingkungan kerja yang berbahaya serta melibatkan banyak individu yang beraktivitas saat bongkar. Salah satu penyebab kecelakaan kerja pada aktivitas bongkar yaitu kelelahan kerja. Kelelahan kerja diartikan sebagai perasaan lelah, letih, kantuk yang berlebihan akibat bebab kerja mental atau fisik yang berlebihan atau berkepanjangan. Oleh karena itu penelitian ini bertujuan mengidentifikasi aktivitas bongkar serta Menghitung tingkat kelelahan kerja dan mengidentifikasi faktor terbesar yang menyebabkan kelelahan kerja pada aktivitas bongkar di pelabuhan perikanan nusantara Brondong. Pengumpulan data penelitian dilakukan dengan metode wawancara dan observasi langsung serta data dianalisis dengan metode Hierarchy Task Analysis (HTA) dan Swedish Occupational Fatigue Inventory (SOFI). Hasil analisis berupa informasi mengenai aktivitas bongkar dalam diagram HTA dan tingkat kelelahan kerja dan faktor penyebab kelelahan pada aktivitas bongkar. Hasil penelitian menunjukkan terdapat 5 tahapan yang dikelompokan menjadi aktivitas-aktivitas meliputi penambatan dan pelaporan kedatangan kapal, penyiapan basket, penyiapan tenaga bongkar, kegiatan bongkar, kegiatan pasca bongkar dan aktivitas bongkar memiliki tingkat kelelahan kerja sedang dengan faktor paling berpengaruh yaitu nyeri pada tubuh pada dimensi ketidaknyamanan fisik., The unloading activity of fishing vessels at the Brondong Fishing Port is one of the main activities in the form of the process of moving fish cargo to the dock. It is an activity that has a high level of work accidents due to hazardous work environment conditions and involves many individuals who move during unloading. One of the causes of work accidents in unloading activities is work fatigue. Work fatigue is a feeling of tiredness, fatigue, and excessive sleepiness due to excessive or prolonged mental or physical labor. Therefore, this study aims to identify loading and unloading activities calculate the level of work fatigue, and identify the biggest factor that causes work fatigue in loading and unloading activities at the Brondong fishing port. The research data collection was carried out by interview and direct observation methods and the data was analyzed by Hierarchy Task Analysis (HTA) and Swedish Occupational Inventory (SOFI) methods. The analysis results are information about unloading activities in the HTA diagram the level of work fatigue and factors that cause fatigue in unloading activities. The results showed that there were 5 stages grouped into activities including mooring and reporting ship arrivals, preparing baskets, preparing unloading personnel, unloading activities, post-unloading activities and unloading activities had a moderate level of work fatigue with the most influential factor being body aching in the physical discomfort dimension
Keyword: aktivitas bongkar, kelelahan kerja, HTA, PPN Brondong, SOFI, Brondong Fishing Port, unloading activities

Judul: Identification of Potential Hazard in Fishing Vessel Unloading Activities at Bitung Ocean Fishing Port
Abstrak: Aktivitas bongkar merupakan aktivitas yang cukup padat dilakukan di Dermaga PPS Bitung. Kegiatan bongkar hasil tangkapan di PPS Bitung belum adanya SOP mengenai keselamatan saat melakukan operasi bongkar. Penelitian dilakukan dengan tujuan untuk mengidentifikasi kegiatan dan menghitung potensi risiko kegiatan pembongkaran ikan di PPS Bitung. Metode pengumpulan data yang digunakan adalah metode observasi langsung kemudian dianalisis dengan metode HTA (Hierarchy Task Analysis), JSA (Job Safety Analysis) dan analisis deskriptif. Hasil yang diperoleh yaitu terdapat total 40 aktivitas yang dikelompokkan menjadi 3 aktivitas utama yaitu persiapan operasi bongkar, operasi bongkar, dan pasca operasi bongkar, yang memiliki tingkat bahaya dibagi menjadi 5 tingkat bahaya, yaitu 3 (7%) tidak berbahaya, 19 (48%) Ringan, 14 (35%) Menengah, 0 (0%) Berat, dan 4 (10%) Fatal. Pengendalian risiko yang dapat dilakukan untuk memperkecil risiko yaitu dengan meningkatkan kesadaran untuk menggunakan APD pada saat kegiatan bongkar., Unloading activities are quite busy activities carried out at Bitung Ocean Fishing Port Bitung OFP. There is no SOP regarding safety when carrying out unloading operations. The aimed of the research were to identify and calculate the potential risks of fish unloading activities at Bitung OFP. The data were collected by direct observation. The data collected then analyzed using HTA (Hierarchy Task Analysis), JSA (Job Safety Analysis) and descriptive analysis methods. The results showed that there were 40 activities in total unloading process which were grouped into 3 main activities, namely unloading preparation activities, unloading activities, and post-unloading activities. Based on the analysis, all of those activities then divided into 5 group level of hazard. The level of hazard of those activities were 3 (7%) no hazard, 19 (48%) light, 14 (35%) medium, 0 (0%) severe, and 4 (10%) fatal. Risk control that can be carried out to minimize risks is by increasing awareness of using PPE during unloading activities.
Keyword: PPS Bitung, work safety, keselamatan kerja, operasi bongkar, potensi risiko, tingkat bahaya, Bitung Ocean Fishing Port, potential hazard, potential risk

Judul: Penentuan Nilai Eigen dan Vektor Eigen dari Matriks Tridiagonal 2-Toeplitz dengan Pendekatan Polinomial Chebyshev
Abstrak: The eigenvalues and eigenvectors of a matrix can be determined by finding its characteristic polynomials. The characteristic polynomials of a tridiagonal 2-Toeplitz matrix is shown to be closely connected to polynomials which satisfy the Chebyshev recurrence relationship. If the order of the matrix is odd, then the eigenvalues are found explicitly in terms of the Chebyshev zeros and the eigenvectors are found in terms of the polynomials satisfying the recurrence relationship. For even ordered matrices, the situation is more complicated. The problem in these cases is that although the Chebyshev recurrence formula is still applied, its initial values are not generating Chebyshev polynomials
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