Judul: Condition of Coral Reefs and Benthic Community Cover in Bontang City
Abstrak: ABSTRAK WAFIQ SALMAN ARROSADI. Kondisi Terumbu Karang dan Tutupan Komunitas Bentik di Kota Bontang. Dibimbing oleh BEGINER SUBHAN dan FERY KURNIAWAN. Indonesia merupakan negara dengan keanekaragaman hayati laut yang melimpah, memiliki sekitar 18% dari total luas terumbu karang di dunia dan dikenal sebagai salah satu titik pusat keanekaragaman hayati laut global. Terumbu karang, sebagai komponen penting dari ekosistem pesisir dan laut, sangat rentan terhadap gangguan. Penelitian ini bertujuan untuk mengevaluasi kondisi terumbu karang dan kualitas perairan di Perairan Kota Bontang, Kalimantan Timur. Data tutupan terumbu karang dianalisis dari sembilan stasiun pengamatan, sementara parameter kualitas air meliputi suhu, salinitas, pH, dan oksigen terlarut. Data yang digunakan dalam penelitian ini merupakan data sekunder yang diperoleh dari Pusat Kajian Sumberdaya Pesisir dan Lautan (PKSPL) IPB dan PT. Pupuk Kaltim. Data sekunder diperoleh dari sembilan stasiun pengamatan Hasil penelitian menunjukkan bahwa terumbu karang di kawasan ini umumnya mengalami degradasi, terutama ditandai dengan dominasi tutupan Rubble dan Dead Coral with Algae. Stasiun dengan tutupan karang hidup tertinggi adalah Stasiun 5 (22,67%), sedangkan Stasiun 4 menunjukkan tutupan terendah (0%). Lifeform karang keras yang dominan adalah Acropora tabulate dan Coral Mushroom. Meskipun demikian, kualitas air secara umum masih berada dalam batas toleransi, walaupun terdapat beberapa parameter yang tidak memenuhi baku mutu yang disarankan. Penelitian ini memberikan gambaran yang penting untuk memahami kondisi ekologis terumbu karang di Kota Bontang dan pentingnya upaya konservasi untuk memulihkan ekosistem ini di masa depan. Kata kunci: terumbu karang, kualitas air, Bontang, Kalimantan Timur, Indonesia., ABSTRACT WAFIQ SALMAN ARROSADI. Condition of Coral Reefs and Benthic Community Cover in Bontang City. Supervised by BEGINER SUBHAN and FERY KURNIAWAN. Indonesia is a country with abundant marine biodiversity, containing approximately 18% of the world's coral reefs and known as one of the global centers of marine biodiversity. Coral reefs, as a vital component of coastal and marine ecosystems, are highly vulnerable to disturbances. This study aims to evaluate the condition of coral reefs and water quality in the waters of Bontang City, East Kalimantan. Coral reef cover data were analyzed from nine observation stations, while water quality parameters included temperature, salinity, pH, and dissolved oxygen. The data used in this study were secondary data obtained from the Center for Coastal and Marine Resources Studies (PKSPL) at IPB University and PT. Pupuk Kaltim. Secondary data were collected from nine observation stations. The results indicate that the coral reefs in this area generally experience degradation, primarily marked by the dominance of Rubble and Dead Coral with Algae covers. Station 5 showed the highest live coral cover (22.67%), whereas Station 4 exhibited the lowest (0%). The dominant hard coral lifeforms were Acropora tabulate and Coral Mushroom. However, overall water quality remains within tolerance limits, although some parameters did not meet recommended standards. This research provides crucial insights into the ecological condition of coral reefs in Bontang City and underscores the importance of conservation efforts to restore this ecosystem in the future. Keywords: coral reefs, water quality, Bontang, East Kalimantan, Indonesia.
Keyword: terumbu karang, bentik, kota bontang

Judul: Coral Reef Ecosystem Analysis Related With The Quality of Water in Labuan Waters, Pandeglang District, Banten
Abstrak: Terumbu karang merupakan ekosistem dengan kerentanan tinggi terhadap perubahan lingkungan perairan, dapat disebabkan faktor alami (autogenic) ataupun faktor manusia (anthropogenic). Penelitian ini dilakukan untuk menganalisis kondisi kualitas perairan serta keterkaiatannya dengan terumbu karang yang dilakukan pada 9 lokasi pengamatan kualitas air dan 4 lokasi pengamatan kondisi ekosistem terumbu karang di wilayah Labuan Banten. Penelitian ini diharapkan dapat menjadi acuan pengelolaan lingkungan wilayah perairan Labuan Banten, serta sebagai bahan dasar pengelolaan sumberdaya ekosistem pesisir khususnya ekosistem terumbu karang perairan Labuan Banten. Metode yang digunakan adalah metode survey, pengambilan data ekosistem terumbu karang dilakukan dengan metode Line Intercept Transect (LIT). Pengukuran kualitas air dilakukan dengan melakukan pengukuran parameter fisika perairan yang dilakukan secara insitu menggunakan water quality meter, dan parameter kimia air laut dengan identifikasi laboratorium. Tutupan substrat dasar ekosistem terumbu karang perairan Labuan Banten memiliki persentase karang keras 1,72% hingga 13,34%. Nilai persentase tutupan karang tersebut menggambarkan kondisi terumbu karang termasuk dalam kategori Rusak. Persentase tutupan substrat dasar berupa algae memiliki nilai tertinggi 54,08%. Nilai kualitas perairan secara umum dicirikan oleh nilai nitrat dan nilai COD dengan kondisi kualitas perairan yang sudah melebihi ambang batas. Keterkaitan kualitas air dengan ekosistem terumbu karang dicirikan dengan persentase Alga yang tinggi akibat tingginya nitrat, Keberadaan komunitas alga yang tinggi pada ekosistem terumbu karang menggambarkan bahwa adanya kompetisi ruang terhadap kondisi terumbu karang di Perairan Labuan Banten., Coral reefs ecosystems are highly vulnerability to the underwater environment changes, both caused by autogenic or anthropogenic. This study has been carried out at nine water quality observation locations and four observation locations for coral reef ecosystem conditions in the Labuan Banten region, to observe the water quality and its relation with coral reefs ecosystem. The outcome this research can be used as reference for environmental management in the waters of Labuan Banten, as well as a primary material for managing coastal ecosystem resources. This research utilise surveys methods, in which the coral cover data used Line Intercept Transect (LIT). Water quality measurements were carried out by measuring the physical parameters of the waters using a water quality meter and the chemical parameters by laboratory identification. The percentage value of coral cover describes the condition of coral reefs included in the damaged category. The percentage of base substrate cover in the form of algae has the highest value of 54.08%. The value of water quality is generally characterized by the value of nitrate and COD with water quality conditions that have exceeded the threshold. A high percentage of algae characterizes the relationship between water quality and coral reef ecosystems due to high nitrate. A high algal community in coral reef ecosystems describes that there is space competition for coral reef conditions in Labuan Banten waters.
Keyword: Algae, Kualitas Air, Labuan Banten

Judul: The Exploration of Discrete Logarithm over Finite Field GF(3m)
Abstrak: The security of many public~key algorithms is based on the problem of finding discrete logarithms. The generalized discrete logarithm problem is the following: given a finite cyclic group G of order n, a generator a of G, and an element fl E G, find the integer x, 0 ~ x ~ n - 1, such that 0: = fl. Algorithm for discrete logarithm problem focused on Menezes et al. (1997) that consist of exhaustive search algorithm, the baby-step giant-step algorithm, Pollard's rho algorithm, Pohlig-Hellman algorithm, and index-calculus algorithm. These algorithms are explorated to be used in discrete logarithm problem over finite field GF(3m ). The exploration also produces some algorithms, i.e. naif negative algorithm, baby-step mother-step algorithm, baby-step mother free-step algorithm, and baby-step free-step algorithm. All algorithms implemented using Maple 11. The Pohlig-Hellman and baby-step giant-step algorithms are efficient enough to be used in discrete logarithm problem over finite field GF(3m ) for m < 20.
Keyword: