Judul: Penetapan Besarnya Erosi di Perkebunan Tebu PT Gunung Madu Plantations, Lampung
Abstrak: PT Gunung Madu Plantations, Lampung sebagai salah satu perusahaan yang bergerak dalam bidang pertanian, khususnya budidaya tanaman tebu, melakukan pertanian lahan kering atau lebih dikenal dengan budidaya tebu lahan kering. Lahan yang ditanami berupa tegalan yang sumber aimya terbatas pada air hujan. Pada dasarnya pertanian dilakukan secara ekstensif bukan intensi£ Penggunaan lahan yang luas menjadi ciri utama dalam pertanian ini dan hasil produksinya tergantung dari luasnya lahan yang ditanami. Penggunaan lahan yang terus menerus dapat mengakibatkan menurunnya produktivitas tanah sehingga produksi yang didapatkan juga menurun. Selain itu banyaknya tanah yang tererosi juga dapat mempengaruhi produkvitas tanah.
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Judul: Penentuan Jadwal Pengolahan Tanah dan Kebutuhan Tenaga Mekanis Serta Pengarunya Terhadap Timeliness Losses di PT Gunung Madu Plantations Lampung
Abstrak: Budidaya tanaman tebu yang baik sebenarnya bukanlah satu-satunya jaminan untuk mencapai tingkat produksi maksi mal. Banyak aspek yang harus diperhitungkan termasuk iklim, tapi agaknya masalah yang sering muncul yang merontokan semua ihwal budidaya tersebut adalah masa tebang yang selalu terlambat. Keterlambatan tebang akan menyebabkan rendemen turun, dan dalam banyak kasus keterlambatan tebang ini menyebabkan kerugian-kerugian yang tidak terhingga. Begitu juga halnya dengan waktu tanam, apabila waktu tanam bergeser lebih awal maupun lebih lambat daripada waktu tanam optimumnya maka akan menyebabkan suatu penurunan hasil panen. Keterlambatan penebangan terjadi karena melimpahnya tebu yang tidak sesuai dengan kapasitas giling pabrik, lama hari giling dan jadwal penanaman yang tidak teratur. Ketidakteraturan ini disebabkan dalam penentuan jadwal penanamannya tidak diselenggarakan dengan kapasitas giling pabrik dan lama hari giling.
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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