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: Occupational Safety During Loading and Unloading Process Fishing Vessel (Case Study of Mini Purseiner at Lempasing Fishing Port, Lampung)
Abstrak: Lempasing fishing port is the largest fishing port in Lampung Province. One of the most widely operated vessel at Lempasing Fishing Port is mini purseiner. There are several activities at the fishing port, namely fish landing activities (loading and unloading) and marketing. Loading and unloading activities at Lempasing Fishing Port are the main activities after a fishing vessel berthing at the pier. Accidents that occur causes losses in the form of delays in loading and unloading activities. The research objectives are to identify activities and hazard potential in loading unloading activities on mini purseiner in Lempasing Fishing Port, to analyze risk opportunities and accident rates that may occur and provide alternative solutions and determine prevention of work accidents. The descriptive, survey, and Hierarchy Task Analysis (HTA) methods were used in this research. The result showed that there were 47 risks of accidents in the loading and unloading activities, as many as 36 (77%) categorized in light risk, 5 (11%) medium risk, 2 (4%) severe risk and 4 (9%) fatal risk. The highest accident risk occurs in unloading activities, because there were a lot of fishers involved and the activities were quite heavy., Pelabuhan Lempasing merupakan pelabuhan perikanan terbesar di Provinsi Lampung. Salah satu kapal yang paling banyak dioperasikan pada Pelabuhan Lempasing yaitu kapal mini purse seine. Terdapat beberapa aktivitas di Pelabuhan Lempasing, yaitu pendaratan ikan (bongkar muat) dan pemasaran. Aktivitas bongkar muat di Pelabuhan Lempasing merupakan aktivitas utama setelah kapal berlabuh di dermaga. Kecelakaan pada kegiatan bongkar muat dapat menyebabkan kerugian berupa terhambatnya aktivitas. Tujuan penelitian yaitu mengidentifikasi aktivitas dan potensi bahaya kegiatan bongkar muat kapal mini purse seine, menganalisis peluang risiko dan tingkat kecelakaan yang mungkin terjadi, memberikan alternatif solusi dan menentukan tindak pencegahan pengendalian kecelakaan kerja. Metode deskriptif, survei, dan Hierarchical Task Analysis (HTA) digunakan dalam penelitian ini. Hasil penelitian menunjukkan bahwa terdapat 47 risiko kecelakaan pada proses bongkar muat, sebanyak 36 (77%) kegiatan berisiko ringan, 5 (11%) menengah, 2 (4%) kegiatan berisiko berat dan 4 (9%) kegiatan berisiko fatal. Risiko kecelakaan terbesar terjadi pada aktivitas bongkar, dikarenakan individu yang terlibat cukup banyak berkisar antara 20 orang dan aktivitas yang dilakukan cukup berat.
Keyword: loading and unloading, work safety, mini purse seine, HTA

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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