Judul: Sistem Pakar Penentuan Kelayakan Usaha Budi Daya Pembenihan Ikan Gurami
Abstrak: This study develops an expert system that is designed to record and use the knowledge, experience, and expertise of the experts in the field of aquaculture feasibility to determine the feasibility of gouramy hatchery. The utilized inference method is Tsukamoto Fuzzy Inference System (FIS) with travezoid curve membership functions. The weighted average is used as the defuzzification method. The parameters used are fuzzy and non-fuzzy. The fuzzy parameters are temperature, amonia (NH3), disolved oxygen (DO), alkalinity, Puissance negative de H (pH), pond water depth, and hardness. The non-fuzzy parameters are the forms of business entities, business licenses, benefits to society, consumer behavior, and the return cost ratio (R/C ratio). Seven fuzzy input parameters has 11 rules for technical scale that are determined by experts to produce the business analysis output. The develoved expert system has been able to analize the feasibility of gouramy hatchery with a capability close to that of expert
Keyword: weighted average., membership functions, hatchery, fuzzy inference system, defuzzification

Judul: Sistem Pakar Penentuan Kelayakan Usaha Budi Daya Pembesaran Ikan Gurami
Abstrak: Growth-out is the final segment in gouramy culture which results in consumption-sized gouramy with a minimum weight of 500 g/fish. This research develops an expert system designed to record and use the knowledge, experience, and expertise of aquaculturist to determine the feasibility of gouramy growth-out culture in accordance with technical, legal, social, cultural, and financial aspects. The utilized inference method is Tsukamoto Fuzzy Inference System (FIS) with trapezoid curve. Meanwhile, weighted average is used as the defuzzification method. Seven parameters, namely technical temperature, ammonia (NH3), disolved oxygen (DO), alkalinity, puissance negative de H (pH), water depth, and height are the fuzzy parameters which are then processed with 11 rules defined by expert to analyze the result of the qualification. This expert system is able to analyze the feasibility of gouramy growth-out culture and already approaching the capability of expert.
Keyword: growth-out., fuzzy inference system (FIS), feasibility

Judul: Karakteristik Piezoelektrik Film LaxSr₁-xTiO3 di atas Substrat TCO
Abstrak: Studi material perovskite SrTiO3 sudah banyak dilakukan dan menunjukkan sifat feroelektrik, piezoelektrik, kuantum paraelektrik dan superkonduktor yang baik. Dengan penambahan dopant La2O3 diduga menambah performa sifat piezo dan karakteristik lainnya. Karakteristik film LaxSr₁-xTiO3 (LST) dengan variasi x= 0, 0.02, 0.04, 0.06 terbentuk pada suhu annealing 550 oC di atas substrat TCO melalui metode (Chemical Solution Deposition) CSD dan spin coating dengan 700 rpm pada kondisi suhu ruang dan tekanan atmosfer standar. Hasil menunjukkan, semakin banyak pendadah La maka nilai ketebalan film, ukuran rerata kristalit, parameter kisi, transmitansi, nilai konduktivitas (maksimum 589.7 S/cm pada sampel x=0.04 di frekuensi 10 Hz), nilai konstanta tegangan (c) dan muatan (d) piezo semakin meningkat. Dinamika bentuk grafik nilai tegangan (V) dan konstanta regangan mekanik (s) nampak mirip. Nilai V mencapai 0.127 V untuk x=0.06 (beban 50 g). Nilai maksimum c, d, s masing-masing mencapai 20.07 Vm/N, 1.14x10-8 C/N, 13642.71. Nilai band gap untuk x=0, 0.02, 0.04, 0.06 masing-masing 3.21 eV, 3.1 eV, 2.6 eV, 2.4 eV. La2O3 menambah performa sifat piezo, sehingga LST berpotensi sebagai sensor tekanan.
Keyword: CSD method, La2O3, LaxSr1-xTiO3, piezoelectric, TCO