Judul: Model regresi fuzzy dengan sistem posibilitas linier
Abstrak: Pada tahun 1984 Tanaka et al mengeinbangkan suatu model regresi fuzzy yang metnanipulasi data yang bersifalfuzzy. Model ini menggunakan t e h k linear progranmiii7g unfxk nwmbuat suaru model yang mirip d e n p regresi linier. Beberapa penelitian telah dilakukan dengan mengpnakan mode1 regresi fuzzy dengan sistern posibilitas linier. Dalarn penelitian tersebut ridak disebutkan pengagmaan suatu perangkat lunak untuk menglutung koefisien-koefisien fuzn, mode1 regresi. Untuk mempennudal~ penerapan model tersebut perlu dibangun suatu perangkat lwlak yang dapat menghitung koefisien fuzzy regresi. Penelitian ini mencoba mcinbuat suatu perangkat lunaIc untuk menghitmg koefisien fuzzy regresi. Perangkat lunak diuji coba dengan nlelakukan regesi terlladap data standar dan data fuzzy. Uji coba data standar diiakukan dengan xnernbuat model regresi tarif angkutan di Kabupaten Bogor. Di lain pihak, untuk data fuz? diuji coba dengan membuat inodei regresi fluktuasi kurs rupiah terhadap dolar Amerika. Hasil uji coba lnenunjukan bdwa model regresi fuzzy dengan sistern posibilitas linier dapar mengidentifikasi koefisienfiq dari model regresi fuzzy. Perangkat lunak yang telall dibuat dapal befingsi sebagaimana mestinya dm dapat dipergunakan untuk keperluan penelitian lain mengenai model regresi fuzzy dengan sistem posibilitas linier. Kata Kunci : Himpunan fuzzy, regressi fuzzy: sisteln posibilitas linier, rnetode simpleks
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Judul: Pemodelan Berbasis Fuzzy Regression
Abstrak: Terdapat beberapa metode yang bisa digunakan dalam membuat model matematika, salah satunya adalah fuzzy regression models. Tujuan dari penelitian ini adalah menelaah penggunaan pendekatan fuzzy regression models untuk memodelkan beberapa masalah real. Fuzzy regression models dapat diterapkan pada beberapa bidang terapan di antaranya pada kasus pertama berupa model harga rumah dan harga kue yang ditulis oleh Alper Basaran et al. 2010 yang bisa dikombinasikan dengan metode lain yaitu dengan metode partial least square. Kasus kedua yaitu model pasokan energi yang ditulis oleh Hikmayangkara et al. tahun 2012 adalah model fuzzy regresi Tanaka yang diperluas oleh Chang dan Ayyub. Model pasokan energi tersebut diharapkan mampu meramalkan pasokan energi di tahun mendatang. Kasus ketiga yaitu model status diabetes membantu pakar kesehatan dalam menyatakan status diabetes seseorang. Secara umum, ketiga kasus pada bidang terapan berbeda tersebut memiliki urutan pengerjaan yang sama dalam menentukan koefisien fuzzy. Fuzzy regression models menjadi salah satu metode alternatif yang bisa digunakan untuk membangun sebuah model dari sebuah masalah.
Keyword: Model, Fuzzy, Fuzzy Regression Models

Judul: Application of phycocyanin from microalgae Spirulina platensis as light harvesting in anatase TiO2 nanoparticle solar cell.
Abstrak: The dye sensitized solar cell (DSSC) has been assemblied used hybrid titanium oxide (TiO2) film/phycocyanin. The TiO2 film was synthesized by sol gel method with titanium chlorida (TiCl4) as precursor by hydrolysis used sulfuric acid (H2SO4). Furthermore, it calcinated for 2,5 hours in variation of annealing temperature (400oC, 600oC, 800oC, dan 1000oC). In XRD patterns exhibited which annealing temperature at 400oC to 800oC were anatase phase all. When annealed at temperature 1000oC, it caused phase transformation from anatase to rutile. The crystals size according to XRD patterns were 13,75 nm, 20,79 nm, 25,25 nm, 48,88 nm and particle size from SEM images were 43,06 nm, 44,91 nm dan 64,99 nm, 80,40 nm, respectively. The crystals and particle size increased with annealing temperature. The film thickness influenced material absorption. The optical measurement of TiO2 film and TiO2/phycocyanin hybrid film used UV-Vis spectrophotometer. Additional phycocyanin caused peak width of absorbed region from ultraviolet to visible region. The band gap energy of TiO2 can be calculated using the cut off wavelength obtained from the absorbance spectrum of a nanoparticles TiO2 films. Based on intersection between linear and energy (hv) axis. In this study just limited for anatase phase. It was caused anatase band gap is wider than rutile phase. That’s meaningful for solar cell application such as dye sensitized solar cell (DSSC). The absorption coefficient average at difference annealing temperature such as at 400oC, 600oC, 800oC were 8,1600x102, 1,7535x103 and 4,0154x102, where α < 104 include to direct transition. Band gap energy 400oC, 600oC, 800oC were 3,79 eV, 3,59 eV, and 3,35 eV, respectively. Based on this result, exhibition that band gap energy of TiO2 semiconductor film decreased with increasing annealing temperature. Spirulina platensis was cultivated in technical modification (Hastuti) with aeration under light intensity about 3000 lux. The cell density (stationer phase) for eighth day which OD value was more than 0,5. It means, the culture can be harvested. In 80 liters Spirulina platensis culture have been produced biomass dry about 10,46 gram and extracted phycocyanin in dry powders was 5,50 gram. The phycocyanin absorption spectrum at the wavelength of 619,36 nm (visible region) which had relaxation energy was 2,945 eV. The emission peak at the wavelength of 708,55 nm with relaxation energy about 2,793 eV. The Stokes shift based on difference energy absorption and emission calculated about 0,152 eV. Both of this showed phycocyanin can absorbed and radiated the sun light which received. This choice characteristic pigment was a good one related to sensitizer in solar cell application. Integration between light harvesting protein and TiO2 semiconductor surface had important role in improving of output as solar cell materials. The presence of carboxylate group (-COOH) made pigment be more efficient was due to anchored to the surface of TiO2 ampoter. The phycocyanin pigment had carboxylate group which reacted with TiO2 surface formed ester. The carboxylate group increased of dye electronics couple from excited state (p anti bonding orbital) to semiconductor acceptor state (TiO2 conduction band). The samples which made based on annealing temperature variation formed be solar cell respectively. Furthermore, cells be assembled for
Keyword: anatase, dye sensitized solar cell, efficiency, gap energy, phycocyanin