Judul: Potensi pemanfaatan air Cengkareng Drain, Pantai Indah Kapuk, Jakarta Utara, sebagai sumber air baku
Abstrak: ADI dan MAJARIANA KRISANTI. Cengkareng Drain merupakan sebuah kanal buatan yang diupayakan dapat dijadikan sebagai sumber air bersih oleh pengelola perumahan Pantai Indah Kapuk. Penelitian ini bertujuan untuk mengevaluasi kesesuaian kualitas air Cengkareng Drain untuk dijadikan sumber air bersih. Penelitian dilaksanakan pada tanggal 28 November-1 Desember 2014. Pengamatan dilakukan setiap satu jam selama 72 jam untuk parameter (DO, pH, temperatur, DHL, TDS, dan salinitas) terkait pasang surut dan satu kali pengamatan dalam sehari pada tiga kedalaman. Analisis data yang digunakan yaitu Indeks Pencemaran (IP) untuk menganalisis kualitas air yang dianalisis di laboratorium dan analisis deskriptif untuk menggambarkan kondisi kualitas air Cengkareng Drain yang diamati secara in situ. Nilai indek pencemaran (IP) pada saat pasang sebesar 8,62, saat surut nilai IP sebesar 5,41. Menurut PPRI No.82 tahun 2001 kelas I perairan tersebut tergolong tercemar sedang disebebkan oleh parameter DO, BOD, COD, total fospat, kekeruhan, raksa, kadmium, selenium, dan total coliform yang tidak sesuai dengan baku mutu perairan. Dengan demikian perairan Cengkareng Drain belum layak untuk dijadikan sumber air baku air minum.
Keyword: Cengkareng Drain, Parameters, Pollution Index, Water Quality

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