Judul: Kualitas Air Cengkareng Drain, Pantai Indah Kapuk, Jakarta Utara Dan Kaitannya Dengan Pasang Surut
Abstrak: Cengkareng Drain merupakan salah satu wilayah yang masih dipengaruhi oleh pasang surut. Perairan Cengkareng Drain dijadikan sebagai titik pengamatan untuk mengkaji keterkaitan antara karakteristik kualitas air dengan pasang surut. Penelitian ini dilakukan satu bulan sekali selama empat bulan pemantauan (Juli-Oktober 2015). Pengambilan contoh air dilakukan pada saat pasang dan surut tiap bulan pemantauan. Indeks Pencemaran menunjukkan bahwa tingkat pencemaran di Cengkareng Drain tergolong tercemar sedang, dengan skor antara 7,7-8,6. Berdasarkan hasil uji t dan analisis similaritas, karakteristik kualitas air pada saat pasang tidak berbeda nyata dengan karakteristik kualitas air pada saat surut. Selama penelitian, nilai total tertinggi pada matrik pembobotan menunjukkan bahwa waktu terbaik pengambilan bahan baku air minum adalah saat surut pada bulan ke-2 pemantauan (Agustus).
Keyword: Cengkareng Drain, kualitas air, pasang surut

Judul: Dynamics of Water Quality and Tides Downstream Cengkareng Drain 2017-2019
Abstrak: Cengkareng drain merupakan salah satu cabang kanal buatan dari sungai Pesanggrahan yang melewati daerah administratif Jakarta Barat dan bermuara di Teluk Jakarta. Muara Cengkareng drain yang terletak di sekitar perumahan menjadikannya sebagai sumber masukan air daerah perumahan Pantai Indah Kapuk (PIK) untuk memenuhi kebutuhan air bersih. Penelitian ini bertujuan menentukan status kelayakan air baku air bersih dengan mendeskripsikan keterkaitan kualitas air di hilir Cengkareng drain, Pantai Indah Kapuk, Jakarta Utara, akibat pengaruh dari pasang surut dan musim. Data yang digunakan merupakan data hasil pemantauan bulanan Tim Kerjasama LPPM IPB – PIK periode 2017-2019. Keterkaitan kualitas air dan pasang surut dianalisis menggunakan analisis regresi linear dan uji t. Pasang surut memberikan pengaruh yang signifikan pada parameter salinitas, DHL, TDS, dan suhu di hilir Cengkareng drain. Air dari hilir Cengkareng drain memerlukan pengelolaan lebih lanjut untuk dapat digunakan sebagai sumber air bersih sesuai baku mutu air Kelas I., Cengkareng drain is a branch of an artificial canal from the Pesanggrahan river that passes through the administrative area of West Jakarta and empties into Jakarta Bay. The Muara Cengkareng drain which is located around the housing estate makes it a source of water input for the Pantai Indah Kapuk (PIK) residential area to meet the community's clean water needs. This study aims to determine the feasibility status of clean water raw water by describing the relationship between water quality in the downstream Cengkareng drain, Pantai Indah Kapuk, North Jakarta, due to the influence of tides and seasons. The data used is the result of monthly monitoring of the LPPM IPB – PIK Cooperation Team for the 2017-2019 period. The relationship between water quality and tides was analyzed using linear regression analysis and t-test. Tides have a significant influence on the parameters of salinity, conductivity, TDS, and temperature in the downstream Cengkareng drain. Water from the downstream Cengkareng drain requires further management to be used as a source of clean water according to Class I water quality standards.
Keyword: Cengkareng drain, dissolved oxygen, salinity, tides, waste

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