Judul: Pengelolaan ketenagakerjaan pada pemetikan teh [Camellia sinensis (L.) O. Kuntze] di Unit Perkebunan Tambi PT Perkebunan Tambi Wonosobo, Jawa Tengah
Abstrak: Kegiatan magang yang dilaksanakan pada bulan Februari sampai Mei 2009 bertujuan agar penulis memiliki kemampuan dan dapat memperluas wawasan dalam hal pengelolaan perkebunan. Tujuan khususnya adalah mengetahui dan memahami pengelolaan perkebunan teh khususnya dalam hal pengelolaan tenaga kerja pada pemetikan. Metode yang digunakan dalam kegiatan magang adalah dengan bekerja sebagai karyawan harian lepas (KHL) selama dua bulan, pendamping mandor/mandor besar selama satu bulan dan pendamping asisten kepala bagian kebun selama satu bulan. Selain itu dilakukan juga pengumpulan data primer melalui observasi lapang terhadap pengelolaan kebun, wawancara dengan karyawan di lapang dan pengumpulan data sekunder melalui laporan berkala, arsip kebun, dan data penunjang lain.
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Judul: Pengelolaan pemupukan pada tanaman teh (Camellia sinensis (L.) O. Kuntze) di Unit Perkebunan Tambi PT Tambi, Wonosobo, Jawa Tengah
Abstrak: Kegiatan magang ini dilaksanakan pada bulan Februari hingga Juni 2015 di Unit Perkebunan Tambi Wonosobo, Jawa Tengah. Tujuan khusus dari magang adalah mempelajari dan menganalisis pengelolaan pemupukan pada tanaman teh. Metode pelaksanaan magang meliputi aspek teknis dan aspek manajerial dengan khusus pengamatan pengelolaan pemupukan. Aspek teknis dilakukan ketika bekerja langsung di lapang menjadi karyawan harian lepas selama satu bulan. Aspek manajerial dilakukan ketika menjadi pendamping mandor, pendamping kepala blok, dan pendamping asisten bagian kebun masing-masing selama satu bulan. Hasil pengamatan menunjukan hubungan dosis dengan produktivitas menunjukan hubungan yang negatif. Kehilangan pupuk menjadi salah satu faktor tidak terpupuk seluruh areal sesuai dengan rencana. Dosis pupuk yang dibenam pada setiap pohon yang dilakukan pekerja tidak sesuai dengan rekomendasi dikarenakan kegiatan di lapang tidak menggunakan alat takar pada setiap pekerja. Pemupukan dilakukan sesuai dengan analisis produksi teh kering dan kondisi tanaman teh di kebun maka dosis pemupukan pada setiap tahun memiliki realisasi dan rencana yang berbeda.
Keyword: Losses of fertilizers, Fertilizers, Nutrients, The realization of the plan, Crop fertilization, Agronomy and horticulture, Botani teh, Tata guna lahan, Tea plantation, Dosis pupuk

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