Judul: Seleksi pola dinding bubu plastik untuk menangkap lobster hijau pasir
Abstrak: Produksi lobster hijau pasir di Indonesia dapat ditingkatkan dengan cara melakukan inovasi terhadap alat tangkap yang telah ada. Penelitian ini menguji coba jenis bubu plastik yang terbuat dari tudung saji berbentuk kubah. Dalam penguj ian, dinding bubu dimodifikasi dengan membentuk pola-pola kisi yang berbeda-beda. Empat pola kisi yang diuji coba dan dijadikan perlakuan adalah (1) pola I, bentuk kisi apa adanya, (2) pola II, kisi dipotong horizontal, (3) pola III, kisi dipotong vertikal, dan (4) pola IV, kisi dipotong persegi pada pertengahan tulangnya. Pola kisi yang termudah dan tercepat dirayapi lobster hijau pasir dianggap sebagai pola dinding yang terbaik. Berdasarkan pengamatan mengenai pola lintasan, panjang lintasan, dan lama waktu merayap lobster hijau pasir maka dapat diketahui bentuk dinding yang paling mudah dirayapi lobster hijau pasir. Dinding yang mudah dirayapi lobster hijau pasir ukuran A (10- 20 g) adalah pola IV, semua pola untuk lobster hijau pasir ukuran B (50–90 g), dan pola III untuk lobster lobster hijau pasir ukuran C (100-110 g). Secara umum, dinding yang mudah dirayapi lobster hijau pasir semua ukuran adalah pola III.
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Judul: Kemiringan dinding lintasan masuk bubu lobster hijau pasir
Abstrak: Nilai ekonomi lobster yang tinggi sebagai komoditi pangan sangat bergantung pada kualitas fisiknya. Perangkap merupakan jenis alat tangkap yang dapat diandalkan untuk menangkap lobster dengan kualitas fisik yang baik. Alat tangkap ini memungkinkan lobster yang tertangkap tetap dalam keadaan hidup dan tanpa cacat fisik karena metode pengoperasiannya. Ada banyak perangkap dengan desain, konstruksi, dan material pembentuknya. Biasanya pembuatan perangkap tidak berdasarkan perhitungan dan pengujia n dahulu. Padahal, salah satu faktor kunci produktivitas perangkap adalah kemiringan dinding yang akan dirayapi lobster. Dinding ini menghubungkan lobster ke mulut perangkap. Apabila kemiringan dinding mempermudah lobster mencapai funnel perangkap, maka lobster akan cepat masuk dalam perangkap. Dalam penelitian diujikan tiga kemiringan dinding perangkap dengan sudut 30, 45, dan 60 . Kemiringan yang dianggap paling cocok adalah kemiringan yang lintasannya paling cepat dirayapi lobster. Selain itu pola gerak yang dibentuk oleh hasil rayapan lobster adalah sederhana dan cenderung lurus.
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Judul: The Effects of Variance of Interest rate to Variance of Annuity Future Values
Abstrak: Time value of money is a concept that refers to the difference of the value of money due to time difference. The value of money for present time would not be the same as the value of money in the future. The value of money for present time is called as Present Value (PV) of the money and the value of money for future time is called Future Value (FV) of the money. Determination the value of money, for present and future time, depends on the time and rate of return. The value of money is determined by several factors such as inflation, fluctuation of interest rates, and government policy in securities and taxation. Due to fluctuation of the value of money we need a FV formulation, it is useful for knowing whether an investment can be profitable or not, and this information is useful also in budget analysis. Annuity is defined as a series of payments made for a specific period. The payment, fixed or varied, can be made at the beginning or at the end of the period. Annuity paid at the beginning of the period is called annuity-due and annuity paid at the end of the period is called immediate annuity-certain. The accumulated value of the annuity after few years later is called as a final value or a future value. Burnecki et al. (2003) have discussed about the FV of a fixed-rate annuity in which payments are made according to the arithmetic or geometric series. They have also examined FV for annuities in which payments are made according to arithmetic or geometric series with random rates of interest. This paper examines FV for annuity-due in which payments are made according to arithmetic or geometric series with interest rates as a random variable, which is normal distribution ,  . Future value formula is expressed in recursive form. FV for annuity-due which payments are made according to the arithmetic or geometric series with random rates of interest is calculated by theoretical way and simulation way. The random rates of interest is denoted as k k i  i  , where k i an independent random variable; i is a constant and k  is a random variable which has normal distribution ,  . By using the determined parameters, a sequence of random rates of interest are generated for theoretical calculation. Meanwhile for the simulation, the random rates of interest is generated 1000 times for the simulation. The generated data give mean value, variance, and standard deviation. Moreover, error of mean value, variance, and standard deviation from the theoretical and simulation results are calculated. Error calculation uses Symmetric Mean Absolute Percentage Error (SMAPE). The smaller the value of SMAPE is the more accurate the simulation. The interest rate variances are varied from 0.000036 to 0.0001 to study the relationship between variance of rates of interest and variance of future value. The theoretical and simulation results show that when the variance of random rates of interest increases, then the variance of FV increases linearly. FV of the annuity-due in
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