Judul: Karakteristik iklim mikro dan respon tanaman padi gogo pada pola tanam sela dengan tanaman karet
Abstrak: Penelitian ini bertujuan untuk mempelajari iklim mikro di bawah tegakan tanaman karet,serta mengidentifikasi perbedaan respon galur padi gogo yang ditanam sebagai tanaman sela pada berbagai umur tanaman karet dan tingkat naungan paranet. Penelitian ini terdiri dari dua tahap yaitu percobaan I dilakukan pada kebun karet PTP. Nusantara VIII Cikumpay-Purwakarta, dimulai Desember 1997-April 1998, dengan menggunakan berbagai tingkat naungan (umur) tanaman karet. Percobaan II dilakukan pada kebun percobaan Pusat Studi Pemuliaan Tanaman (PSPT) Cikabayan - Darmaga, mulai Juni-Oktober 1998, dengan menggunakan naungan paranet.
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Judul: Modifikasi Iklim Mikro, Pertumbuhan dan Produksi Padi Gogo di  Bawah Naungan Karet Menggunakan Reflektor
Abstrak: Penelitian ini dilakukan mulai bulan Agustus 2001 sampai Mei 2002 di lahan gambut Desa Pelalawan, Kecamatan Pelalawan, Kabupaten Pelalawan Propinsi Riau. Berdasarkan hasil penelitian terlihat bahwa pembakaran menyebabkan penurunan jumlah jenis semai dan peningkatan jumlah jenis tumbuhan bawah pada bulan ketiga dan keenam setelah pembakaran. Peningkatan jumlah jenis tumbuhan bawah disebabkan karena ketersediaan benih yang tinggi dan dengan adanya pencahayaan akibat pembakaran mampu merangsang perkecambahan benihnya. Berdasarkan hasil analisis sifat fisik tanah diketahui bahwa secara umum pembakaran limbah vegetasi menyebabkan peningkatan nilai bulk density pada gambut saprik, namun cenderung menurun pada gambut hemik, sedangkan pada gambut fibrik cenderung tetap. Nilai porositas tanah pada gambut saprik dan hemik cenderung menurun setelah pembakaran, namun pada gambut fibrik cenderung tetap. Nilai water holding capacity menurun setelah pembakaran pada gambut saprik dan hemik, namun meningkat pada gambut fibrik. Pembakaran menyebabkan penurunan nilai permeabilitas pada gambut saprik, hemik maupun fibrik. Berdasarkan hasil analisis sifat kimia tanah diketahui bahwa pembakaran pada ketiga tipe gambut menyebabkan peningkatan pH tanah dan kandungan hara sesaat setelah pembakaran, namun mulai menurun nilainya pada bulan ketiga dan keenam setelah pembakaran. Pembakaran juga telah menyebabkan penurunan total mikroorganisme tanah, total fungi, respirasi mikroorganisme tanah dan kualitas air.
Keyword: Oryza sativa, Padi gogo, Multiple cropping, Climate modification, Rubber plants, Microclimate, Reflector

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