Judul: Aspek pengendalian gulma di perkebunan sagu [Metroxylon spp.] di PT. National Timber and Forest Product, Selat Panjang, Riau
Abstrak: Tujuan pelaksanaan kegiatan magang untuk meningkatkan keterampilan pengetahuan mahasiswa mengenai teknis budidaya sagu di perkebunan, meningkatkan kemampuan mahasiswa dalam memasuki dunia kerja, memperoleh pengetahuan praktis dari pelaksanaan magang di perkebunan, mempelajari pengaruh gulma terhadap pertumbuhan tanaman sagu, mempelajari efektivitas pengendalian gulma secara kimia dan mekanis. Kegiatan magang tersebut dilaksanakan di PT. National Timber and Forest Product, Kecamatan Tebing Tinggi, Kabupaten Meranti, Provinsi Riau pada bulan Februari – Juni 2009.
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Judul: Pengelolaan Sagu (Metroxylon  spp.)  Khususnya Aspek Pemupukan di PT. National Timber and Forest  Product, Selat Panjang, Riau.
Abstrak: Tujuan dari kegiatan magang adalah untuk mendapatkan informasi dan pengalaman kerja di lapang mengenai budidaya dan pengelolaan perkebunan sagu, serta untuk mendapatkan informasi mengenai pengaruh pemberian berbagai jenis pupuk daun pada pertumbuhan tanaman sagu. Magang dilaksanakan di PT. National Timber and Forest Product, Selat Panjang, Riau dari 20 Februari 2009 – 20 Juni 2009. Metode yang digunakan dalam kegiatan magang tersebut adalah dengan menggunakan metode langsung dan tak langsung. Untuk mengetahui pengaruh pemberian berbagai jenis pupuk daun pada tanaman sagu didekati dengan melakukan percobaan. Pupuk daun yang diaplikasikan adalah Biogronic D dengan konsentrasi 5 cc/l, Gandasil D 2 g/l, dan Java Mineral Tani (JMT) 2 cc/l. Rancangan percobaan yang digunakan adalah rancangan kelompok lengkap ter- acak (RKLT) dengan tiga ulangan. Kegiatan budidaya tanaman sagu yang dite- rapkan di PT. National Timber and Forest Product meliputi pengambilan anakan, persemaian, penanaman, penjarangan anakan, pengendalian gulma dan HPT, pe- mupukan, pemanenan, serta sensus tanaman. PT. National Timber and Forest Pro- duct termasuk dalam jenis organisasi lini/garis dengan tenaga kerja yang terdiri atas tenaga kerja tetap, kontrak, dan harian. Pemberian berbagai jenis pupuk daun tidak memberikan pengaruh yang nyata pada pertumbuhan anakan sagu. Kondisi lingkungan lebih berpengaruh terhadap pertumbuhan anakan sagu dari pada pe- ngaruh dari pupuk daun. Perlu dilakukan percobaan lebih lanjut mengenai pem- berian konsentrasi pupuk daun yang lebih tinggi dan periode aplikasi yang tepat sehingga dapat memberikan pengaruh pertumbuhan yang optimum pada tanaman sagu. Sebelum aplikasi pemupukan dilaksanakan sebaiknya gulma dan anakan sagu sudah dikendalikan dan ketinggian air dijaga antara 30-50 cm dari permu- kaan tanah sehingga penambahan unsur hara dapat digunakan secara optimum oleh tanaman sagu.
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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