Judul: Pengembangan industri kayu jeungjing (Paraserianthes falcataria (L.) Nielsen) ditinjau dari kualitas tegakkannya studi kasus di Kabupaten Sukabumi
Abstrak: Penelitian ini bertujuan untuk mengetahui secara mikroskopis kerusakan anatomi daun B. purpurea sebagai tanaman tepi jalan di Kota Bogor, untuk menduga adanya pengaruh emisi kendaraan bermotor. Bahan yang digunakan dalam penelitian ini adalah preparat daun pohon B. purpurea berupa daun muda dan daun tua. Dalam penelitian ini dilakukan pengamatan terhadap kerusakan bentuk, warna dan isi sel pada jaringan epidermis atas dan bawah, palisade serta bunga karang. Hasil pengamatan kerusakan dianalisis secara deskriptif. Selain itu dilakukan pula pengukuran terhadap panjang dan lebar sel masing-masing jaringan (epidermis atas dan bawah, palisade serta bunga karang) dan hasil pengamatan ini dianalisis dengan menggunakan Rancangan Percobaan. Faktorial dengan dua perlakuan, yaitu umur daun dan faktor lokasi.
Keyword: Bauhinia purpurea L.

Judul: Studi inventarisasi kualitas untuk menduga nilai pohon sengon (Paraserianthes falcataria(L) nielsen di Kesatuan Pemangkuan Hutan Bogor Perum Perhutani Unit III Jawa Barat
Abstrak: Pengelolaan hutan yang baik memerlukan teknik perencanaan pengelolaan yang Daik pula. Perencanaan hutan bertujuan untuk mencapai hasil yang maksimum Derdasarkan prinsip pengelolaan hutan yang lestari dan serbaguna. Inventarisasi kualitas pohon adalah metoda dalam inventarisasi hutan untuk menaksir secara obyektif volume pohon di dalam sampel melalui pengukuran seksi- seksi pada pohon model dengan memperhatikan karakteristik dari pohon tersebut yang membuat kayu menjadi lebih atau kurang bermanfaat dan berharga untuk tujuan- Tujuan tertentu (FAO, 1967 dalam Husch, 1971). Tujuan penelitian ini adalah untuk mendapatkan model penduga nilai pohon Jenis sengon (Paraserianthes falcataria), melalui kegiatan inventarisasi kualitas. Data referensi yang diperlukan adalah persyaratan bahan baku pada berbagai industri yang memanfaatkan kayu sengon serta harga kayu sesuai dengan kualitasnya. Dalam penentuan model regresi penduga nilai pohon terpilih jenis sengon, dilakukan uji coba analisis regresi pada model: Regresi Linier Sederhana, Regresi Semilog I, Regresi Semilog II dan Regresi Double-Log Paper. Jenis Industri yang menggunakan bahan baku sengon di BKPH Parung Panjang KPH Bogor yaitu industri bahan bangunan, industri kerangka meubel, industri peti kemas. Pembagian kualitas kayu sengon telah ditetapkan oleh Perum Perhutani yaitu berdasarkan Keputusan Direksi Perum Perhutani nomor: 2476/Kpts/Dir/1994 tentang Pedoman Persyaratan Sortasi Kayu Bundar Sengon. ...
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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