Judul: Pemetikan Pucuk Teh (Camellia sinensis (L.) O. Kuntze) Di Perkebunan Medini, Pt. Rumpun Sari Medini, Kabupaten Kendal, Jawa Tengah
Abstrak: Kegiatan magang ini bertujuan untuk mempelajari aspek pengelolaan pemetikan pucuk teh, baik aspek teknis maupun manajerial yang dilaksanakan di perkebunan. Kegiatan magang dilaksanakan di Perkebunan Medini, Kabupaten Kendal Jawa Tengah. Pelaksanaan kegiatan magang dimulai tanggal 1 maret hingga 30 juni 2002. Metode yang dilaksanakan adalah kerja aktif dengan mengikuti seluruh kegiatan-kegiatan kebun pada berbagai tingkatan mulai dari buruh harian lepas, pendamping mandor, pendamping kepala afdeling, pendamping kepala tanaman dan pendamping administratur. Pengumpulan data bersumber pada data primer dan sekunder
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Judul: Pengelolaan Pemetikan Pucuk Teh (Camellia sinensis (L.) 0. Kuntze) di PTP Nusantara VIII, Kebun Ciater, Subang, Jawa Barat.
Abstrak: Kegiatan magang bertujuan memberikan pengalaman kerja praktis mengenai pengelolaan budidaya dan pengolahan teh, memberikan pengalaman manajerial pada berbagai tingkatan pengelolaan, dan menganalisis permasalahan yang tejadi di lapang. Sasaran dari kegiatan magang adalah mahasiswa dapat mempelajari faktor-faktor yang mempengaruhi produksi pucuk yang dihasilkan antara lain jenis pemetikan, jenis petikan, rumus petik, sistem pemetikan, gilir petik, hanca pemetikan, analisa petikan serta menghitung kebutuhan tenaga pemetik dan menganalisis faktor-faktor lain seperti curah hujan, ketinggian tempat, umur pangkas, tanah, dan kesehatan tanaman yang akan mempengaruhi kecepatan pertumbuhan pucuk. Melalui kegiatan magang, mahasiswa diharapkan mempunyai kemampuan profesional dalam menghadapi kondisi aktual kerja dan mampu menangani permasalahan yang dihadapi di lapang.
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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