Judul: Pengusahaan tanaman tebu di pabrik gula ngadiredjo Kediri, PTP XXI - XXII ( Persero ) Jawa Timur
Abstrak: Tebu merupakan salah satu tanaman yang dapat menghasilkan gula. Menurut Wilsie (1962) kira-kira 60% dari produksi gula dunia berasal dari tebu dan 40% berasal dari bit gula. Univer Tanaman tebu tumbuh di daerah tropika dan subtropika di sekitar katulistiwa sampai batas garis isoterm 20° C, yakni 39° garis lintang utara dan 35 lintang selatan. Tanaman tebu dapat tumbuh dari pantai sampai ke dataran tinggi 1 400 m di atas permukaan laut (dpl) (Notojoewono, 1964). Produksi gula Indonesia akhir Pelita II (1978) masih belum dapat memenuhi kebutuhan, sehingga masih harus meng- import sebesar 350 000 ton (Saputro, 1979). Dengan bertambahnya penduduk dan bertambahnya tingkat kemakmuran, kebutuhan gula makin bertambah. Pada akhir Pelita III (1983) kebutuhan gula untuk konsumsi dalam negeri diperkirakan sebesar 1.8 juta ton. Kebutuhan ini diperkirakan untuk konsumsi penduduk sebesar 150 901 000 jiwa dengan kebutuhan gula perkapita per tahun sebesar 12 kg (Anonim, 1978, dalam Yogasara, 1979). ...
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Judul: Pengusahaan Tanaman Tebu di Pg. Pesantren Baru- Kediri PT perkebunan XXI-XXII (Persero) Jawa Timur
Abstrak: Tanaman tebu (Saccharum officinarum) merupakan salah satu tanaman penghasil gula yang penting, karena setengah dari produksi gula dunia berasal dari tanaman tebu. Saat ini kebutuhan gula di dunia terus meningkat, sejalan dengan semakin bertambahnya penduduk dunia dan semakin majunya perekonomian bangsa (Viton, 1972 dalam Sugeng Sudiatso, 1980). PR Produksi gula di Indonesia belum dapat memenuhi kebutuhan didalam negeri yang semakin meningkat. Peningkatan ini disebabkan oleh pertambahan penduduk dan makin meningkatnya kemampuan masyarakat dalam mencukupi kebutuhan sehari-hari. Untuk tahun 1980 diperkirakan kebutuhan gula dalam negeri akan mencapai 1.9 juta ton, sedangkan produksi dalam negeri kira-kira 1.2 1.3 juta ton saja, sehingga pemerintah masih harus mengimpor sebanyak setengah juta ton lebih untuk dapat mencukupi kekurangan ini. Dalam usaha mencukupi kebutuhan gula dalam negeri dengan produksi sendiri, pemerintah berusaha meningkatkan produksi gula dengan berbagai cara. Pertama dengan jalan meningkatkan produksi dari Pabrik gula-pabrik gula yang ada di pulau Jawa dengan jalan memperbesar output persatuan luas yang ditanami tebu (intensifikasi), rehabilitasi dan kalau perlu dengan modernisasi dari semua usaha teknis baik tanaman maupun pengolahan tebu.
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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