Judul: Karakteristik Habitat Populasi Dan Penyebaran Rekrekan (Presbytis Fredericae Sody, 1930) Di Resort Semuncar Taman Nasional Gunung Merbabu
Abstrak: Penelitian ini dilakukan dengan tujuan untuk mengetahui karakteristik habitat, populasi dan penyebaran rekrekan (Presbytis fredericae Sody, 1930). Vegetasi pada habitat rekrekan diketahui dengan metode analisis vegetasi. Metode transek garis digunakan untuk mendeteksi keberadaan satwaliar, predator dan keberadaan populasi rekrekan. Populasi rekrekan yang ditemukan selanjutnya disensus dengan metode terkonsentrasi. Hasil penelitian menunjukan, rekrekan ditemukan pada ketinggian 2 150 - 2 420 m dpl dengan suhu 19 C - 21 C dan kelembaban udara sebesar 89% - 94%. Intensitas cahaya di habitat rekrekan berkisar antara 8 260 lx - 120 831 lx. Vegetasi pada habitat rekrekan didominasi oleh jenis kesowo (Engelhardia serrate). Populasi rekrekan ditemukan sebanyak 2 kelompok dengan total populasi sebanyak 15 individu dan kepadatan populasi sebesar 0,395 individu/km2. Penyebaran rekrekan yaitu pada bukit Bundas, Ndeles, Dok Malang, Dok Cilik, Tulangan dan Pandean.
Keyword: habitat, rekrekan, resort Semuncar

Judul: Distribution and Population of Proboscis Monkeys  (Nasalis larvatus Wurmb 1781) in Sepandan Resort Danau Sentarum National Park.
Abstrak: Bekantan merupakan satwa yang dilindungi pemerintah dengan status terancam punah (endangered species). Taman Nasional Danau Sentarum mengalami masalah biofisik (kebakaran hutan, konversi hutan, perburuan) yang mengancam kelestarian bekantan. Penelitian bertujuan menduga populasi dan mengetahui persebaran serta mendeskripsikan faktor yang mempengaruhi sebaran bekantan di Resort Sepandan. Penelitian dilaksanakan pada bulan Juli-Agustus 2022 menggunakan metode line transect, concentration count, wawancara, analisis vegetasi, dan diperkuat dengan studi literatur. Kepadatan populasi bekantan di Resort Sepandan sebesar 1,94 individu/km2 presentase. Nisbah kelamin bekantan di resort sepandan yaitu 1:2. INP tertinggi pada tutupan riparian, hutan rawa gambut, dan lahan terbuka Sentarum saat musim kemarau secara berurutan yaitu temirit (Timonius flavescens) 157,03%, kawi (Shorea balangeran) 164,27%, dan laban (Vitex pubescens) 128,30%. Parameter biotik yang berpengaruh terhadap sebaran bekantan berupa pakan, aktivitas manusia, predator, dan kompetitor. Persentase jenis tumbuhan pakan bekantan sebesar 41,67%. Parameter abiotik yang mempengaruhi pergerakan bekantan yaitu curah hujan, suhu, kelembaban, dan kondisi air danau. Bekantan sering dijumpai pada pagi dan sore hari dengan rerata suhu 26,31°C dan 30,72°C serta rerata kelembaban 90,18% dan 78,09%.
Keyword: Bekantan, Populasi, Sebaran, distribution, population, proboscis monkey

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