Judul: Pelestarian burung kepodang (Oriolus chinensis maculatus di Kampus IPB Darmaga
Abstrak: Tujuan penelitian adalah untuk mempelajari usaha peles- tarian burung Kepodang kuduk hitam (Oriolus chinensis) di kampus IPB Darmaga dengan mengamati habitat, populasi, pe- rilaku dan persepsi masyarakat. Pengamatan terhadap burung Kepodang kuduk hitam dilakukan pada kondisi terkurung dan kondisi bebas. 11 IT Populasi dihitung dengan cara consentration count yaitu penghitungan setiap burung Kepodang kuduk hitam yang terdapat di dalam plot pengamatan. Habitat diamati dengan melakukan analisa vegetasi dan persepsi masyarakat diamati dengan melakukan wawancara. Dan populasi burung Kepodang kuduk hitan. di desa Babakan Darmaga adalah 74 ekor dengan kepadatan populasi 0,22 ekor per hektar. Lokasi yang diamati adalah Arboretum Fakultas Kehuta- nan, kebun karet dan tanaman pekarangan di sekitar kompleks perumahan dosen (RW V). Arboretum Fakultas Kehutanan luas- nya 0,36 hektar, terdapat 41 jenis pohon dengan 29 jenis tanaman bawah. Jenis pohon yang paling dominan adalah Jeunjing (Albizia falcataria) dan kayu afrika (Maesopsis e-menii), sedangkan tanaman bawah didominasi oleh Otthocla nodosa. Kebunkaret didominasi oleh pohon karel (loven brani- liensis) jenis pohon lain adalah beringin (Ficus benjamina), Jeunjing (Albizia falcataria) dan kelapa sawit (Eluesis gu- naensis). Tanaman bawah ada 46 jenis dan yang paling domi- nan adalah Ottochloa nodosa. Pada plot pengamatan ditemukan kolam dan aliran sungai kecil. Di pekarangan perumahan dosen terdapat 15 jenis pohon dengan kerapatan 149 pohon per hektar. Jenis yang paling dominan adalah rambutan (Nephelium lapaceum) dan cengkeh (Eugenia aromatica). Pepohonan yang dimanfaatkan burung Ke- podang kuduk hitam sebagai relung berperilaku adalah Jeunjing (Albizia falcataria), beringin (Ficus benjamina), puspa (Schima noronhae), laban (Vitex pubescens), rambutan (Nephelium lapaceum), durian (Durio zibethinus), alpukat (Persea americana), karet (Hevea brasiliensis) dan muncang (Gmelina arborea). Dengan demikian jenis-jenis pohor ter- sebut disarankan sebagai tanaman pengganti pohon karet yang telah dan akan dikonversi di kampus IPB Darmaga. Ferilaku burung Kepodang kuduk hiter (Oriolus chinensis) adalah perilaku makan, minum perjalanan, berkicau, mandi, berjemur, istirahat, meregang tubuh, menggoreskan parruh,..dst
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Judul: Population and Distribution Pattern of The Black-naped Oriole (Oriolus chinensis Linnaeus,1766) di Kampus IPB Dramaga
Abstrak: The black-naped oriole (Oriolus chinensis Linnaeus, 1766) is one of the 99 bird species in the Dramaga Campus of IPB University. This bird included in medium-sized bird with length around 26 cm, has golden yellow feathers and beautiful voice. The black-naped oriole are included in the Least Concern protected status according to the IUCN Red List. Due to the declining population, this study was conducted to identifying the population and distribution pattern of the Blacknaped oriole on the Dramaga Campus of IPB University. This research was conducted in September-October 2020 using the path transect method with three repetitions. The analyzes carried out in this study were habitat analysis, population estimation, and morisita index. After a preliminary survey from 10 mapped locations, the Black-naped oriole were found in 5 locations, that is Conservation Park, Al-hurriyyah Forest, Coin, Faculty of Forestry and Environment, and Lecturer's Housing. The total number of individuals found is 67 individuals. The highest encounters were on Coins with a total of 21 individuals. Based on the calculation of population estimation, the population density value is 13,4 individuals/ha with an abundance of 12 individuals/encounter. The morisita index value obtained is 1.15 (>1) so that the distribution pattern of The Black-naper oriole is in groups., Kepudang kuduk hitam (Oriolus chinensis Linnaeus, 1766) merupakan salah satu dari 99 spesies burung yang ada di Kampus IPB Dramaga. Burung ini termasuk burung berukuran sedang dengan panjang berkisar 26 cm memiliki bulu kuning keemasan dan suara yang indah. Burung kepudang termasuk dalam status perlindungan Least Concern menurut IUCN Red List. Dikarenakan populasinya yang semakin menurun, maka dilakukan penelitian ini dengan tujuan mengidentifikasi populasi dan pola sebaran Kepudang kuduk hitam di Kampus IPB Dramaga. Penelitian ini dilakukan pada bulan September-Oktober 2020 menggunakan metode transek jalur dengan tiga kali pengulangan. Analisis yang dilakukan pada penelitian ini adalah analisis habitat, pendugaan populasi, dan indeks morisita. Setelah dilakukan survey pendahuluan, dari 10 lokasi yang dipetakan didapatkan perjumpaan pada 5 lokasi yaitu Taman Konservasi, Hutan Al-hurriyyah, Koin, Fakultas Kehutanan dan Lingkungan, dan Perumahan dosen. Total individu yang dijumpai adalah 67 individu. Perjumpaan tertinggi berada di Koin dengan total 21 individu. Berdasarkan perhitungan pendugaan populasi diperoleh nilai kepadatan populasi 13,4 individu/ha dengan kelimpahan 12 individu/perjumpaan. Nilai indeks morisita yang diperoleh adalah 1,15 (>1) sehingga didapatkan pola sebaran Kepudang kuduk hitam adalah berkelompok
Keyword: bird population, distribution pattern, morisita index, Oriolus chinensis

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