Judul: Pengelolaan Pemetikan Tanaman Teh (Camellia sinensis (L.) O. Kuntze) di Unit Perkebunan Rumpun Sari Kemuning, PT Sumber Abadi Tirta Sentosa, Karanganyar, Jawa Tengah
Abstrak: Kegiatan magang dilaksanakan untuk memperluas pengetahuan, pengalaman teknis dan manajerial tanaman teh serta mempelajari aspek pemetikan. Kegiatan magang dilaksanakan di Perkebunan Rumpun Sari Kemuning, Karanganyar, Jawa Tengah pada bulan Februari sampai Juni 2014. Metode yang dilaksanakan selama kegiatan magang terbagi atas dua yaitu metode langsung dan tidak langsung. Metode langsung dilakukan secara aktif mengikuti dan mengamati kegiatan teknis di lapangan dan wawancara. Metode tidak langsung dilakukan dengan mengumpulkan laporan manajemen, arsip kebun dan jurnal penelitian teh. Hasil magang menunjukkan bahwa tinggi bidang petik, diameter bidang petik, tebal daun pemeliharaan, kapasitas pemetik, gilir dan hanca petik, dan sarana transportasi telah sesuai standar PPTK Gambung. Analisis petik dan analisis pucuk masih perlu peningkatan agar kuantitas dan kualitas pucuk yang optimal. Pemangkasan mesin lebih efektif daripada pemangkasan manual dinilai dari bobot brangkasan dan manajemen waktu. Produksi dan HOK masih memerlukan jumlah tenaga kerja dalam memenuhi target produksi.
Keyword: bobot brangkasan, pemetikan, Perkebunan Rumpun Sari Kemuning, teh

Judul: Pengelolaan Pemangkasan Tanaman Teh (Camellia Sinensis (L.) O. Kuntze) Di Unit Perkebunan Pt Rumpun Sari Kemuning, Karanganyar, Jawa Tengah
Abstrak: Kegiatan magang dilaksanakan untuk memperluas pengetahuan, pengalaman teknis dan manajerial tanaman teh serta mempelajari aspek pemangkasan. Kegiatan magang dilaksanakan di PT Rumpun Sari Kemuning, Karanganyar, Jawa Tengah pada 10 Februari - 10 Juni 2014. Pengambilan data dilakukan dengan menggunakan metode langsung dan tidak langsung. Gilir pangkas di Unit Perkebunan PT Rumpun Sari Kemuning yaitu 4 tahun sesuai dengan pedoman pemangkasan untuk daerah dataran tinggi (> 1 200 m dpl), namun karena beberapa permasalahan, gilir pangkas dapat mencapai empat hingga enam tahun. Hal ini disebabkan kondisi kebun, iklim, biaya, dan tenaga kerja. Luas areal yang dipangkas setiap tahun adalah 25 % dari total luas lahan produktif (437.82 ha). Pemangkasan dilakukan dengan menggunakan sabit pangkas dan mesin pemotong. Gilir pangkas berpengaruh terhadap pertumbuhan pangkas dan jenis pangkasan pada tanaman teh.
Keyword: tanaman teh, pemangkasan, gilir pangkas, jenis pangkas

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