Judul: Biologi Ganoderma boninense PAT. pada kelapa sawit (Elaeis guineensis Jacq.) dan pengaruh beberapa mikroba tanah antagonistik terhadap pertumbuhannya
Abstrak: Hasil survei pada beberapa petak contoh di kebun kelapa sawit Adolina, Gunung Bayu, dan Tinjowan, Sumatera Utara, menunjukkan bahwa tanaman kelapa sawit yang menderita kerusakan akibat serangan Ganoderma boninense cenderung berkelompok. Penyebaran tanaman sakit tidak membentuk pola teratur. Sering didapati tanaman sehat di antara tanaman sakit atau tanaman tumbang. Berat serta luas serangan patogen semakin meningkat dengan bertambahnya umur tanaman.
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Judul: Dampak fungisida dan herbisida terhadap Ganodeuna boninense Pat dan cendawan antagonisnya in vitro
Abstrak: G. boninense dan antagonisnya menunjukkan respons yang beragam baik terhadap perlakuan fungisida maupun terhadap herbisida. Tridemorf dan triadimenol ternyata menghambat pertumbuhan miselium ketiga isolat patogen dan kelima antagonisnya, juga menghambat sporulasi anta­gonis, serta menghambat antagonisme antara keduanya. Toksisitas fungisida terhadap antagonis lebih rendah di­bandingkan terhadap patogen. Tridemorf lebih toksik da­ripada triadimenol. Isolat PPM-1 dari patogen lebih to­leran terhadap tridemorf. sedangkan isolat BI0-9 tole.ran terhadap triadimenol tetapi sensitif terhadap tridemorf. Herbisida yang umum digunakan di pe.rkebunan kelapa sawit ternyata sebagian dapat mendorong perkembangan penyakit busuk pangkal batang. Parakuat da.n 2,4-D a.min memacu pertumbuhan patogen tetapi menghambat pertumbuhan mise­lium dan sporulasi cendawan antagonisnya. Meskipun de­mikian, Trichoderma harzianum BI0-2 merupakan antagonis yang paling baik. Herbisida dengan konsentrasi rendah dapat mernacu antagonisme. Antagonisme lebih dihambat oleh fungisida dibandingkan dengan herbisida.
Keyword: Ganoderma boninense, Elaeis guineensis, Microbial antagonists

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