Judul: Pengelolaan tanaman tebu (Saccharum officinarum. L) di PG Madukismo PT Madubaru Yogyakarta dengan aspek khusus manajemen tebang angkut tebu
Abstrak: Pabrik gula (PG) Madukismo berdiri pada tahun 1955. Pabrik gula ini merupakan perusahaan swasta di bawah pimpinan Sri Sultan Hamengkubuwono IX. PT Madubaru PG/PS Madukismo berdiri dari dua kepemilikan saham, yaitu 65% milik Sri Sultan Hamengkubuwono IX dan 35% milik PT Rajawali Nusantara Indonesia. PG Madukismo didirikan di lokasi bekas PG Padokan 5 km di sebelah selatan Yogyakarta, tepatnya di Desa Padokan, Kelurahan Tirtonirmolo, Kecamatan Kasihan, Kabupaten Bantul, Provinsi DIY. Pabrik menempati areal seluas 276,000 m² dengan luas bangunan 51,000 m². Berdasarkan letak geografi, PG Madukismo terletak antara 7°4' LU dan 8°20' LS dan antara 110° dan 111° BT pada ketinggian 84 m dpl. Kegiatan magang bertujuan untuk meningkatkan pengetahuan dan keterampilan dalam setiap teknis budidaya dan manajemen di perkebunan serta mengetahui bagaimana manajemen tebang angkut tebu yang baik dan benar. Magang ini dilaksanakan mulai tanggal 13 Februari hingga 13 Mei 2012 di PG Madukismo PT Madubaru, Bantul, Yogyakarta. Kegiatan magang dilaksanakan dengan menggunakan dua metode yaitu metode langsung dan metode tidak langsung. Metode langsung meliputi beberapa kegiatan mengenai aspek teknis, aspek manajerial, dan aspek khusus yang merupakan data primer dan diperoleh secara langsung di lapangan. Metode tidak langsung yang dilakukan pada saat magang adalah pengumpulan data-data sekunder PG Madukismo beserta studi pustakanya. Berdasarkan kegiatan manajemen tebang angkut tebu yang dilakukan di lapangan, diperoleh data kehilangan hasil panen dan persentase kotoran tebu. Kehilangan hasil panen tersebut diukur dari tebu tertinggal di lahan yang berupa tunggul/tunggak. Hasil yang diperoleh adalah kehilangan hasil panen pada tebu tertinggal di lahan daerah Bantul lebih besar dibandingkan dengan daerah Purworejo…dst
Keyword: Harvest, Transportation, Management, Trash

Judul: Pengelolaan Tanaman Tebu (Saccharum officinarum L.) di PG Madukismo PT Madubaru Yogyakarta dengan Aspek Khusus Manajemen Tebang Angkut Tebu.
Abstrak: The objective of this internship is to increase technical and managerial skill. The internship was conducted from February 13th until May 13th 2012 at PG Madukismo PT Madubaru, Bantul, Yogyakarta. Observations made with the specific aspects of harvest and transportation management. Particular aspect observed was losses and the percentage of sugar cane trash. The results obtained from the observation is all the problems that occur during harvest and transportation can be managed by applying the good practises of harvest and transportation management. Harvest and transportation management is an activity in organizing and putting things relating harvest and transportation according to the standards. Losses in Bantul area larger than the area of Purworejo. Levels of impurities in PG Madukismo percentage is still below the tolerance limit corporate standards. A proper harvest system is consider terms of sugarcane milling capacity, the optimal maturity, state of the plant, area conditions, weather and climate, the number of worker and transport methods. Losses of sugarcane during harvest have effect on the productivity levels of sugar that produced.
Keyword: 

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