Judul: Pemangkasan Tanaman Teh (Camellia sinensis (L.) O. Kuntze) di Perkebunan Ciater Subang-Jawa Barat
Abstrak: Kondisi lingkungan terutama suhu dan kelembaban udara sangat berpengaruh terhadap hasil pemangkasan. Meskipun demikian pemangkasan dapat dilakukan sepanjang tahun dengan memilih tipe pangkasan yang tepat. Kegiatan magang ini bertujuan untuk mengamati, mempelajari dan menganalisa pangkasan bersih dan pangkasan jambul pada tanaman teh di Perkebunan Ciater.
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Judul: Pengelolaan pemangkasan teh (Camellia sinensis (L.) O. Kuntze) di PTP Nusantara VIII, Kebun Ciater, Subang, Jawa Barat
Abstrak: Pemangkasan merupakan salah satu kegiatan pemeliharaan tanaman teh periode tanaman menghasilkan (TM). Tindakan pemangkasan dapat mengganggu pertumbuhan dan produktivitas tanaman. Oleh karena itu, pemangkasan harus dilaksanakan secara hati-hati dan memperhatikan kondisi tanaman lingkungan hidupnya. serta Kegiatan magang secara umum bertujuan untuk meningkatkan keterkaitan dan kesepadanan antara proses pendidikan dengan lapangan kerja, meningkatkan kemampuan profesional mahasiswa dan memperoleh umpan balik dari dunia kerja bagi perguruan tinggi. Adapun tujuan khususnya untuk meningkatkan pengetahuan dan memberikan pengalaman kerja kepada mahasiswa. Magang dilaksanakan selama empat bulan, mulai Pebruari hingga Juni 2000 di Perkebunan Ciater PTPN VIII Subang, Jawa Barat. Metode yang digunakan adalah dengan bekerja di lapang, dan mengumpulkan data secara langsung dan tidak langsung. Selanjutnya dilakukan analisa data secara sederhana. Tanaman teh di Perkebunan Ciater secara umum termasuk tanaman teh menghasilkan (TM). Kegiatan pemeliharaan yang dilaksanakan di Perkebunan Ciater meliputi pengendalian hama dan penyakit, pengendalian gulma, pemupukan dan pemangkasan. Jenis pangkasan yang dilakukan di Perkebunan Ciater adalah pangkasan bersih dan pangkasan jambul. Pangkasan jambul dilaksanakan di Afdeling Ciater IV dan hanya pada kondisi yang sangat diperlukan, yaitu pada saat musim kemarau dengan mempertimbangkan ketersediaan tenaga pemangkas. Perkebunan Ciater terletak pada ketinggian 600 -1 600 m dpl dan secara umum menggunakan gilir pangkas 3.5 tahun. Namun sejak tahun 1998, pemangkasan di Perkebunan Ciater mulai mengalami keterlambatan. Hal ini disebabkan oleh keterbatasan jumlah tenaga pemangkas...dst
Keyword: perkebunan teh, Ciater, pemetikan, pemangkasan, pengolahan

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