Judul: Perencanaan sistem pengangkutan tebu dalam pendayagunaan fasilitas pengangkutan di PG Colomadu PTP XV-XVI Surakarta
Abstrak: Tiga aktifitas yang berperan di dalam proses produksi gula adalah penebangan atau pemanenan tebu, pengangkutan tebu dari kebun ke pabrik dan pengolahan tebu menjadi gula. Pengangkutan tebu merupakan suatu kegiatan pemindahan tebu dari lokasi kebun ke pabrik yang dilaksa- nakan secara cepat dan aman. Tujuan penelitian ini adalah mempelajari sistem pengangkutan tebu pada fasilitas pengangkutan tebu di PG Colomadu PTP XV XVI Surakarta, dalam usaha menekan selang waktu tunggu tebu antara proses penggilingan yang seminimum mungkin. pemanenan dengan Faktor-faktor yang berpengaruh di dalam sistem peng- angkutan tebu yakni jumlah panen tebu dari kebun yang se- dang dipanen, kapasitas giling tebu mesin pabrik, lama waktu pemuatan tebu ke fasilitas pengangkutan, jarak dan lama waktu pengangkutan tebu dari lokasi kebun ke pabrik, lama waktu pembongkaran tebu dari fasilitas pengangkutan, lama waktu perjalanan kembali fasilitas pengangkutan ke lokasi kebun dan bentuk jalur antriannya. ...
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Judul: Pengusahaan tanaman tebu dan pelaksanaan tebu rakyat intensifikasi di pg colomadu PTP XV-XVI surakarta
Abstrak: Tanaman tebu (Saccharum officinarum L.) merupakan tanaman penghasil gula yang penting peranannya bagi Indonesia, yang berfungsi sebagai bahan pangan dan bahan industri. Indonesia dahulu merupakan negara pengekspor gula ke dua terbesar di dunia. Setelah terjadi krisis ekonomi dunia dan setelah perang dunia ke dua, produksi gula Indonesia menurun. Penurunan produksi gula tersebut antara lain disebabkan karena sebagian pabrik gula dan perkebunan tebu di Indonesia mengalami kerugian dan kerusakan berat akibat perang, sehingga terpaksa tutup. Pada tahun-tahun terakhir ini Indonesia sedang berusaha untuk meningkatkan lagi produksi gula, sehingga kebutuhan dalam negeri bisa dipenuhi. Dalam pelita IV, Peseroan TerbatasbPerkebunan Gula dituntut tidak hanya dapat memenuhi kebutuhan konsumsi nasional dalam rangka swasembada gula, tetapi juga diwajibkan untuk dapat mengekspor gula dalam rangka meningkatkan devisa negara. Untuk itu diperlukan peningkatan produksi gula secara pasti sekitar 12 persen setiap tahun.
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Judul: Algorithm Construction of HLI Hash Function
Abstrak: Cryptography is a study of mathematical techniques related to aspects of information security regarding on confidentiality, data integrity, entity authentication, and data origin authentication. Data integrity is a service, which is associated with the conversion of data carried out by unauthorized parties. To maintain data integrity, one can use hash functions. An hash function is a computationally efficient function to map an arbitrary length bitstring to a fixed length bitstring called as hash value. The use of hash function in maintaining the information integrity and authentication is in digital signatures, virus protection, and software distribution. Illustration of the hash function in the integrity and authentication of information that is emailed as follow. The sender sends the information and hash value to the recipient. If the hash value of the information is equal to the hash value that is sent by the sender, then information has not been changed. Otherwise the information has been changed. An hash function has two properties, one way and collision resistance. An hash function is called one way if it is computationally infeasible to find any input such that when given any hash value . Meanwhile an hash function is called collision resistant if it is computationally infeasible to find any two inputs where such that . The purpose of this study is to construct a HLI hash function algorithm, to analyze the speed and security of the hash functions as a results of construction. Furthermore, it is to compare it with SWIFFT. Hash function is constructed based on the result of algebraic operations on modular polynomial ringwith . Modular polynomial ring noted as is a set of all polynomials of degree at most with coefficients in . can be represented as a set of integer vector of modulo in dimension . So, it is simple to implement in a computer. In vector operations, is lattice . Furthermore, alattice that is defined from certain polynomial ring is called ideal lattice. HLI hash function is consists of addition and multiplication algorithm in the ring. Addition algorithm consists of sumation operations of modulo and multiplication consists of multiplication operations of modulo . Generally, algorithm of HLI hash function consists of multiplication operations of modulo and addition operations of modulo . However, if the input is binary number then multiplication algorithm only consists of multiplication operation of modulo , so algorithm of HLI hash function consists of multiplication operations of modulo and addtion operations of modulo . An hash function is secured if it has two properties, i.e., one way and collision resistance. HLI hash function hash is one way, it is following the proof of Micciancio. It is has collision resistant because of polynomial is irreducible over and monic. Moreover, it is proved that for every unit vector , the vector is small vector. If the input of hash function is a binary number then HLI hash function only involves addition operations of modulo . So the time that used almost same with SWIFFT. The excellence of HLI hash function is the key size smaller than SWIFFT. This effect on
Keyword: hash function, modular polynomial ring, lattice