Indonesia requires a maritime surveillance system that's capable to monitor its extensive waters territorial. One of the maritime standard navigation systems named AIS (Automatic Identification System), which is based on GPS and VHF digital communication, have enabled the ship monitoring in a real-time. By placing AIS receiver on the satellite, its coverage will be larger compared to the one usually placed on the seashore by maritime authority. Orbiting the AIS receiver prompted appearing the limitation of Time Division Multiple Access (TDMA) technology so the probability of ship detection would decrease drastically due to a huge number of heard ship signal simultaneously. This paper describes the design of satellite constellation for Indonesian maritime surveillance based on the result of the AIS data acquisition by LAPAN-A2 and LAPAN-A3 satellites that operate in both equatorial and polar orbit.
Beban kerja mental ialah perbandingan antara tuntutan kerja mental dengan keahlian mental yang dipunyai oleh karyawan yang bersangkutan yaitu karyawan. Adapun permasalahan yang terjadi adalah kondisi pekerjaan yang menuntut supaya karyawan bisa menuntaskan pekerjaan dengan mutu yang baik dalam waktu yang sudah ditentukan, sehingga memiliki beban untuk menyelesaikannya. Tujuan penelitian ini guna mengetahui besar beban kerja mental yang didapatkan karyawan, mengetahui indikator yang paling mempengaruhi dan memberikan usulan perbaikan. Pengukuran ini dikerjakan dengan menggunakan NASA - TLX dengan mengambil sampel acak sebanyak 11 responden. Berdasarkan skor yang diperoleh, diketahui bahwa beban kerja mental agak tinggi dirasakan sebanyak 9%, kategori tinggi sebanyak 81 % dan sangat tinggi sebanyak 10%. Dan indikator tertinggi yang paling dirasakan karyawan adalah indikator temporal demand, performance, effort, serta mental demand. Oleh karena itu diberi usulan perbaikan berdasarkan fishbone diagram yaitu indikator temporal demand berupa manajemen diri serta manajemen waktu dalam menuntaskan sebuah pekerjaan, usulan performance yaitu melakukan penambahan karyawan, kemudian usulan indikator effort yaitu memberlakukan adanya reward, dan usulan mental demand yaitu memeriksa jobdesk dari pekerjaan yang diberikan dan memberikan evaluasi kerja secara berkala.
Currently, Indonesia does not have a standard size for prayer mats. For this reason, the size of the prayer mat should be designed according to Islamic requirements and laws. This can be done by measuring the human body which is directly related to determining the dimensions of the prayer mat. The length and width of the prayer mat can be determined by knowing the length of the prostration and the width of the shoulders. This research was conducted using an ergonomic approach with anthropometric methods and the cosine formula. This study focuses on male and female adult prayer mats. This research resulted in the length of the prayer mats 1277.12 mm and 1229.1 mm, while the widths of the prayer mats were 805 mm and 744 mm.
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