Judul: Kajian ekologi kemukus (Piper cubeba L.F) ditinjau dari aspek tanah. fisiografi dan iklim di Taman Nasional Meru Betiri Jawa Timur
Abstrak: Kemukus (Piper cubeba L.F) salah satu spesies dari Piperaceae yang digunakan masyarakat sebagai salah satu tumbuhan untuk mengobati berbagai jenis penyakit antara lain obat anti diare, masuk angin, radang usus, disentri, perut mulas, asma, peluruh air seni, antiseptik, penghilang bau mulut, kencing bernanah dan radang selaput lendir. : Tujuan penelitian ini untuk mengetahui parameter tanah, fisiografi dan iklim yang berpengaruh terhadap kehi dupan dan penyebaran kemukus. Dengan hasil penelitian ini diharapkan dapat memberikan data atau informasi dalam upaya penangkaran dan pelestarian kemukus. Survei lapang- an dalam penelitian ini dilakukan sejak tanggal 11 September 1993 sampai dengan 5 November 1993 di Taman Nasional Meru Betiri, Jawa Timur. Parameter ekologi yang diamati adalah faktor fisik yang terdiri dari keadaan fisiografi berupa ketinggian tempat dari permukaan laut, arah lereng dan kemiringan, faktor tanah berupa sifat-sifat fisik dan kimia tanah serta faktor iklim terdiri dari suhu rata-rata harian, kelembaban rata-rata harian dan intensitas cahaya harian pada pukul 07.30, 13.30 dan 17.30 WIB. Analisa vegetasi dilakukan untuk tingkat pohon, tiang, pancang, tumbuhan bawah dan semai. Tingkat pohon parameter yang diamati adalah: ...
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Judul: Kajian faktor-faktor lingkungan biotik tumbuhan obat kemukus (Piper cubeba L.F.) di Taman Nasional Meru Betiri Jawa Timur
Abstrak: Piper cubeba atau kemukus merupakan salah satu jenis tumbuhan obat yang belum banyak diketahui aspek ekologinya, yang mempunyai manfaat dalam penyembuhan beberapa macam penyakit terutama ashma dan gonorrhoe. Oleh karena itu perlu tersedia data ekologi yang dapat digunakan untuk upaya penangkaran atau budidaya kemukus. Tujuan penelitian ini adalah untuk mengetahui faktor-faktor lingkungan biotik yang mempengaruhi kehidupan kemukus. Data dan informasi mengenai faktor-faktor tersebut dapat digunakan sebagai masukan dalam rangka upaya penangkaran atau budidaya kemukus. Penelitian ini dilakukan di 4 resort yaitu Resort Bandealit, Mandilis, Sukamade dan Guci Betiri yang terletak dalam kawasan Taman Nasional Meru Betiri Jawa Timur. Waktu penelitian yaitu tanggal 11 September hingga 11 November 1993. ...
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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