Judul: Water Quality Evaluation for Tourism and Agricultural Feasibility at Situ Gede Sub-District of Bogor Barat, Bogor City
Abstrak: Saat ini, air yang tercemar merupakan masalah utama dalam penurunan kualitas air. Penurunan kualitas air akan menurunkan daya guna dan kapasitas sumber daya air. Tujuan penelitian ini adalah untuk menganalisis kualitas air Situ Gede dengan parameter fisika-kimia, menganalisis perubahan tata guna lahan, serta menentukan indeks pencemaran perairan. Penelitian dilakukan pengujian di lapangan untuk parameter pH, suhu, DHL, TDS dan kedalaman, serta pengujian di laboratorium untuk parameter TSS, DO, BOD, dan Nitrit. Situ Gede memiliki Indeks Pencemaran dengan kategori tercemar ringan, dimana nilai IP berada pada rentang 1-5. Analisis tata guna lahan yang dilakukan perbandingan antara peta tahun 2021 dengan tahun 2012, terdapat peningkatan permukiman dan jumlah penduduk. Suhu air berkisar antara 28,5-31,1ºC, nilai DHL berkisar antara 134,4-195,5 mmhos/cm, nilai TDS pada rentang 67,1-94 ppm dan TSS memiliki kisaran 2,75-8,25 mg/L, sedangkan parameter kimia, pH air pada kisaran 5,42-6,75, nilai DO memiliki kisaran 4,93-7,05 mg/L, nilai BOD berkisar 1,41-3,92 mg/L dan nilai nitrit berkisar 0,061-0,265 mg/L. Hasil pengujian, terdapat 2 parameter yang nlainya tidak sesuai dengan baku mutu yaitu pH dan nitrit. Hal ini dapat diakibatkan adanya hujan, adanya pembuangan sampah organik maupun anorganik di area tepi situ, adanya limbah pupuk dari pertanian, dan adanya RPH (Rumah Potong Hewan).
Keyword: parameters, testing, value, water quality

Judul: Penilaian ekonomi Situ Gede, Kelurahan Situ Gede, Kecamatan Bogor Barat, Kota Bogor
Abstrak: Situ Gede is a pond located in Bogor City, precisely in Situ Gede Village, West Bogor Sub-district, Bogor Infrastructure management of Situ Gede has not been optimalize like very few trashcan, tourism attraction and only few rest area available. Hence, the reseach about economic value of Situ Gede were made. This research is aimed for: (1) analyzing nearby citizen’s perception about Situ Gede’s environmental and management, (2)identifiying the variations of Situ Gede utilization, and (3) estimating the economic value of Situ Gede utilization. Some of kind lake utilizations that conducted in Situ Gede at this time are as fishing ground, irrigation, and tourism object. The aim of this research is to calculate Situ Gede’s economic value using market price method for the fishery utilization, cost analysis for the agricultural utilization, and travel cost method for the tourism utilization. Respondents’ perception of Situ Gede are good air quality, good water quality, beautiful scenery, poor waste disposal system around the lake, and the operations management that still has not run well. Economic valuation for the utilization of Situ Gede consist of fishery utilization which worth 2.621.740.000 IDR, agricultural utilization which worth 18.500.471 IDR, and tourism utilization which worth 1.157.062.500 IDR. Use value of Situ Gede is 3.797.302.971 IDR.
Keyword: Bogor Agricultural University, Economic  Value of Irrigated Water., Travel Cost Method, Situ Gede, Market Price Method, Valuation

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