Judul: Smart Incubator Penetasan Telur Ikan Kerapu Bebek (Cromileptes altivelis)
Abstrak: Ikan kerapu merupakan salah satu ikan yang banyak digemari masyarakat dunia dan memiliki nilai ekonomis yang tinggi. Budidaya ikan kerapu sudah banyak dilakukan di berbagai negara khususnya di Indonesia. Budidaya ikan kerapu di Indonesia dimulai dari tahap pembenihan hingga pembesaran. Salah satu kendala dalam upaya budidaya ikan kerapu adalah kecilnya angka keberhasilan dalam proses inkubasi. Tulisan ini bertujuan menghasilkan instrumen yang dapat mempertahankan suhu inkubasi secara otomatis. Wadah inkubator terbuat dari kaca akuarium dengan wadah bagian luar berukuran 35x35x35 cm dan wadah bagian dalam berukuran 20x25x35 cm. Sistem kerja alat inkubasi ini yaitu wadah bagian dalam berfungsi sebagai tempat meletakkan telur dan terdapat sensor DS18B20. Wadah bagian luar berisikan heater yang berfungsi sebagai pemanas dan water pump yang berfungsi sebagai alat penyalur air supaya panas terbagi merata. Alat inkubasi ini beroperasi dengan mempertahankan suhu pada kondisi 30°C sehingga tidak terdapat fluktuasi suhu pada saat proses inkubasi. Berdasarkan hasil uji lapang alat inkubator ini memiliki akurasi yang cukup tinggi karena mampu mempertahankan suhu dengan fluktuasi yang sangat rendah yaitu 0,32°C. Kata kunci: ikan kerapu, inkubasi, otomatis, suhu, Grouper is one of the most popular fish in the world and has high economic value. Grouper cultivation has been widely carried out in various countries, especially in Indonesia. Grouper cultivation in Indonesia starts from the hatchery process to the enlargement process. The low success rate in the incubation process is one of the obstacles in grouper cultivation efforts. This paper aims to produce a tool that can maintain the incubation temperature automatically. The incubator container is made of aquarium glass, the outer container is 35x35x35 cm and the inner container is 20x25x35 cm. The inner container has a DS18B20 sensor, this container is used for laying eggs. The outer container contains a heater and water pump which are used as a means of distributing water so that it is thoroughly heated. This incubation tool operates by maintaining the temperature at 30°C so that there is no temperature fluctuation during the incubation process. Based on the results of field tests, this incubator has a fairly high accuracy because it is able to maintain a very low temperature fluctuation of 0.32°C. Keywords: grouper, incubation, automatic, temperature
Keyword: grouper, incubation, automatic, temperature

Judul: Design Fuzzy Logic Controller for Temperature Control on Catfish (Clarias gariepinus) Egg Incubation System
Abstrak: Karakteristik telur ikan yang sensitif terhadap perubahan parameter lingkungan terutama suhu dapat menyebabkan rendahnya daya tetas telur ikan, sehingga diperlukan teknologi kontrol agar dapat menjaga suhu media penetasan tetap berada pada rentang yang optimal. Di lain pihak juga berkembang suatu teknologi kontrol yang menerapkan pendekatan secara linguistik, sistem kontrol ini disebut dengan sistem kendali logika fuzzy. Penelitian ini bertujuan merancang kontrol logika fuzzy untuk kendali suhu sistem inkubasi telur ikan lele dumbo. Rancang bangun sistem kontrol terdiri atas tahapan perancangan perangkat keras dengan Arduino Mega 2560 sebagai sistem utama kontrol, kemudian dilanjutkan dengan perancangan perangkat lunak serta uji kinerja sistem kontrol. Pengujian dilakukan pada setpoint 30 ºC dengan nilai error steady state ±0,1% dan memperoleh daya tetas telur sebesar 63,33%. Pengujian juga dilakukan pada tingkat setpoint 28-31 ºC dengan nilai error steady state rata rata 0,1%. Fluktuasi suhu berkisar ±0,06 ºC., The characteristics of fish eggs that are sensitive to changes in environmental parameters, especially temperatur can cause low hatchability of fish eggs, so control technology is needed in order to keep the temperature of the hatching media in an optimal range. On the other hand, a control technology that applies a linguistic approach is also developed, this control system is called a fuzzy logic control system. This study aims to design a fuzzy logic control for temperature control of the catfish egg incubation system. The control system design consists of hardware design stages with an Arduino Mega 2560 as the main control system, followed by software design and control system performance testing. The test was carried out at a setpoint of 30 ºC with a steady state error value of ±0,1% and obtained an hatchinf rate of 63,33%. Tests were also carried out at the setpoint level of 28-31 ºC with an average steady state error value of 0,1%. Temperature fluctuations ranged ±0,06 ºC.
Keyword: catfish egg, fuzzy logic, incubator, temperature control

Judul: Socioeconomic and psychological variables influencing household debt
Abstrak: The overall objective of this study was to examine factors influencing total debt, total debt payment, and patterns of debt payments. The study examined the impacts of both psychological (credit attitudes and perception of future income) and socioe- conomic variables on total debt, total debt payment and patterns of debt payments. A conceptual model for this study was developed by incorporating the theory of borrower risk, the economic and psychological economic theory of borrowing, and the results of previous studies. This model identifies socioeconomic and psycholog- ical variables that influence total debt, total debt payment, and patterns of debt payments. Socioeconomic variables included in the model are gender, race, mari- tal status, employment status, household size, age, education, and household assets. Psychological variables are credit attitudes toward the use of credit, and perception of future income. This study used data from the 1989 Survey of Consumer Finances. The survey was sponsored by the Federal Reserve in cooperation with some other federal agencies. Data for the survey were collected by the Survey Research Center at the University of Michigan between August 1989 and March 1990. dst ...
Keyword: Gender