Judul: Korelasi Kualitas Air terhadap Kinerja Produksi dan Analisis Komponen Utama Produktivitas Udang Vaname (Litopenaeus vannamei) di PT Surya Windu Kartika
Abstrak: Udang vaname adalah komoditas unggulan dalam industri perikanan Indonesia. Budidaya udang vaname yang prospektif tidak luput dari permasalahan yang dapat menurunkan hasil produksi. Kualitas air yang menurun dapat mengakibatkan kematian. Penelitian bertujuan menganalisis korelasi kualitas air serta komponen utama pada budidaya udang vaname unit Badean PT SWK, Banyuwangi, Jawa Timur. Penelitian dilakukan menggunakan 5 kolam dengan padat tebar 96–102 ekor/m2 . Kualitas air yang diamati diantaranya pH, salinitas, suhu, kecerahan, oksigen terlarut, total plankton, NH4, NO2, NO3, PO4, alkalinitas, TOM, total yellow vibrio, total green vibrio, dan total vibrio count. Kualitas air di uji korelasi dengan kinerja produksi dan uji PCA terhadap produktivitas. SR berhubungan negatif signifikan dengan suhu siang, NO2, dan alkalinitas. FCR berhubungan signifikan positif dengan pH pagi, suhu pagi, suhu siang, dan alkalinitas. Sedangkan kecerahan pagi, kecerahan siang, DO malam berhubungan negatif terhadap FCR. Tidak ada kualitas air yang berhubungan kuat dan signifikan dengan ADG. Kualitas air yang terukur masih berada pada kisaran optimal, namun terdapat beberapa parameter yang memiliki kisaran yang berfluktuasi. Hasil PCA menunjukkan 4 PC. Komponen utama pada PC1 ada DO malam (positif), PC2 komponen utamanya TGV (positif), PC3 komponen utamanya ADG (positif), komponen utama pada PC4 adalah NO3 (positif)., Vannamei shrimp is a leading commodity in the Indonesian fishing industry. Prospective vaname shrimp cultivation is not free from problems that can reduce production yields. Decreased water quality can lead to death. This study aims to analyze the correlation of water quality and the main components in the cultivation of vaname shrimp at the Badean unit of PT SWK, Banyuwangi, East Java. The study was conducted using 5 ponds with a stocking density of 96–102 fish/m2. The observed water quality included pH, salinity, temperature, brightness, dissolved oxygen, total plankton, NH4, NO2, NO3, PO4, alkalinity, TOM, total yellow vibrio, total green vibrio, and total vibrio count. Water quality was tested for correlation with production performance and PCA test on productivity. SR was significantly negatively related to daytime temperature, NO2, and alkalinity. FCR was significantly positively related to morning pH, morning temperature, afternoon temperature, and alkalinity. Meanwhile, morning brightness, afternoon brightness, and night DO are negatively related to FCR. There is no water quality that is strongly and significantly associated with ADG. The measured water quality is still in the optimal range, but there are some parameters that have fluctuating ranges. PCA results show 4 PCs. The main components in PC1 is night DO (positive), PC2 isthe main component TGV (positive), PC3 is the main component is ADG (positive), the main component in PC4 is NO3 (positive).
Keyword: correlation, water quality, white shrimp

Judul: Korelasi Kualitas Air dan Kinerja Produksi pada Pembesaran Udang Vaname (Litopenaeus vannamei) di PT Dewi Laut Aquaculture, Garut
Abstrak: Udang vaname (Litopenaeus vannamei) merupakan komoditas unggulan perikanan yang bernilai ekonomis tinggi. Salah satu faktor yang mempengaruhi keberhasilan budidaya udang vaname yaitu faktor kualitas air. Penelitian ini bertujuan untuk menghitung korelasi kualitas air selama pemeliharaan dan kinerja produksi udang vaname di Dewi Laut Aquaculture, Garut, Jawa Barat. Penelitian ini dilakukan dengan pengamatan secara langsung di tambak udang vaname pada tambak pemeliharaan dengan sistem intensif. Metode yang digunakan pada penelitian ini adalah analisis principal component analysis (PCA) dan uji korelasi. Parameter penelitian yang diamati adalah kualitas air (kecerahan, pH, DO, suhu, salinitas, amonia, nitrit, nitrat, alkalinitas, kesadahan, TOM, plankton, dan bakteri), survival rate (SR), average daily growth (ADG), feed conversion ratio (FCR). Hasil uji korelasi menunjukkan parameter nitrit, dan nitrat menjadi parameter yang paling banyak berkorelasi dengan parameter kinerja produksi. Parameter nitrit - 0,414 dan nitrat -0,496 berkorelasi negatif sedang dengan parameter SR. Parameter nitrit dan nitrat sama-sama berkorelasi negatif sedang dengan ADG yaitu masing masing sebesar -0,416 dan -0,424. Sementara itu, parameter nitrit dan nitrat berkorelasi positif sedang dengan parameter FCR yaitu masing-masing sebesar 0,419 dan 0,427., Whiteleg shrimp (Litopenaeus vannamei) is a leading fishery commodity with high economic value. One of the factors that affect the success of vannamei shrimp farming is the water quality factor. This study aims to calculate the correlation of water quality during rearing and production performance of vannamei shrimp in Dewi Laut Aquaculture, Garut, West Java. This study was conducted by direct observation in vannamei shrimp ponds in ponds with intensive system maintenance. The method used in this study was principal component analysis (PCA) and correlation test. The research parameters observed were water quality (brightness, pH, DO, temperature, salinity, ammonia, nitrite, nitrate, alkalinity, hardness, TOM, plankton, and bacteria), survival rate (SR), average daily growth (ADG), feed conversion ratio (FCR). Correlation test results showed that nitrite and nitrate parameters were the most correlated with production performance parameters. Nitrite -0.414 and nitrate -0.496 were moderately negatively correlated with SR parameters. The nitrite and nitrate parameters were both moderately negatively correlated with ADG at -0.416 and -0.424, respectively. Meanwhile, the nitrite and nitrate parameters were moderately positively correlated with the FCR parameter at 0.419 and 0.427.
Keyword: correlation, pond, production performance, shrimp vannamei, water  quality

Judul: Eksplorasi Masalah Logaritma Diskret pada Finite Field G P(2m)
Abstrak: Discrete logarithm problem represents a problem which is defined as modular arithmetic. It is often used to generate a key pair on public key cryptography as security object. Given cyclic group G of order n, αgenerator of G, and β∈􀜩, then, in general, discrete logarithm problem is determined as the integer 􀝔, 0≤􀝔≤􀝊−1, such that α􀯫≡β(mod 􀝊). In Menezes et al. (1997) the algorithm to solve the discrete logarithm problem in common cyclic group G are Exhaustive Search algorithm, Baby-Step Giant-Step, Pollard's rho, Pohlig Hellman and Index Calculus. Furthermore, these algorithms are explored to determine the solution of discrete logarithm problem on 􀜩􀜨(2􀯠). The reconstructed algorithms are implemented using Maple 11 software. These implementation can be used to measure security level of cryptography algorithm, which is based on security aspects of discrete logarithm problem
Keyword: