Judul: Model Regresi Logistik Biner untuk Identifikasi Faktor-Faktor yang Mempengaruhi Siswa Masuk Jurusan IPA/IPS
Abstrak: One direction is desired for students and parents is the science classes. On the one hand, this course allows the student has a choice of majors in universities more than other majors and a lot of work to only accept students from science classes. Ironically, many students who choose to major in science but does not support the student's ability. Dealing with the issue, it must be examined factors that influence students major in science. One method used to analyze the factors that affect students entering the science classes of binary logistic regression. Response variables used in this study categorical form of data on the status of the incoming students are students majoring in science or social studies. The data used in this study is population data class XI of SMAN 2 Bogor, West Java, the academic year 2012/2013. The number of total population is 279 students. Results of analysis of this study is binary logistic regression models produce values overall classification accuracy of 92.8% for the model classification table and 92.7% for the ROC curve. Explanatory variables used in this study a total of 18 explanatory variables and the explanatory variables are eight ties associated with variable responses to the real level of 5%. Wald test results obtained by the three explanatory variables that significantly influence the status of the students choose a major motivation, student aspirations and students are happy with the lesson or not exact.
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Judul: Identifikasi Faktor-faktor yang Memengaruhi Keberhasilan Akademik Mahasiswa Menggunakan Regresi Logistik Multinomial
Abstrak: Keberhasilan akademik mahasiswa di perguruan tinggi dapat ditentukan berdasarkan nilai indeks prestasi kumulatif (IPK) dan ketepatan waktu kelulusan. Selama ini pemodelan terhadap IPK dan ketepatan waktu kelulusan sebagian besar dilakukan secara terpisah. Dalam penelitian ini, dibentuk empat kategori kombinasi antara IPK dan ketepatan waktu kelulusan, yaitu IPK<3.00 dan lulus tidak tepat waktu, IPK<3.00 dan lulus tepat waktu, IPK≥3.00 dan lulus tidak tepat waktu, serta IPK≥3.00 dan lulus tepat waktu. Penelitian ini menggunakan data mahasiswa IPB angkatan 48 untuk mengidentifikasi faktor – faktor yang memengaruhi keberhasilan akademik mahasiswa serta mengetahui tingkat ketepatan klasifikasi dari model yang diperoleh. Salah satu analisis yang dapat digunakan yaitu analisis regresi logistik multinomial dengan peubah respon kombinasi antara IPK dan ketepatan waktu lulus. Hasil analisis regresi logistik multinomial tersebut menunjukkan bahwa faktor-faktor yang memengaruhi keberhasilan akademik mahasiswa IPB angkatan 48 adalah jenis kelamin, IPK TPB, beasiswa, jalur masuk, asal daerah, dan fakultas. Model regresi logistik multinomial memberikan ketepatan klasifikasi sebesar 65.4%.
Keyword: IPK, ketepatan waktu kelulusan, regresi logistik multinomial

Judul: Hybrid solar cells of ZnO nanoparticles/chlorophyll was modified metal ions (Zn2+ and Cu2+ )
Abstrak: Zinc Oxide (ZnO) is a n-type semiconductor with a wide the energy band (Band Gap) is 3.37 eV at room temperature and 3.34 eV at low temperature with a large exiton binding energy is 60 meV. ZnO has been synthesized by hydrothermal method, resulting in a decrease in particle size over the duration of the hydrothermal changes. Crystallographic structure of ZnO were characterized using XRD, has shown the characteristic pattern of a hexagonal wurtzite structure, the crystallite size increases to changes in particle size. Changes in particle size has also led to a change in the absorption peak of ZnO as has been demonstrated posted under test using the optical properties of UV-Vis spectrophotometer. Changes of this uptake has also led to changes in the energy band gap, which increases its band gap energy of the particle size. In electronic applications, especially in solar cells. Chlorophyll is considered less effective, because of their very nature are easily degraded as a result of several reactions which are acid, lighting and temperature. The results of the stability test using a halogen lamp 34 W/m2 for 5 hours, that the substitution of chlorophyll with metal ions Zn2+ and Cu2+ has been shown to form more stable than natural chlorophyll. The characterization of the optical properties, the combination of ZnO / chlorophyll in the form of hybrid films has led to a shift in the absorption region of ZnO becomes more widely from the UV to Visible. ZnO/chlorophyll has absorption range of 350-515 nm, ZnO / Zn-feofitin 332-401 nm and 332-632 nm for Cu-feofitin. The combination of ZnO/chlorophyll and CuSCN as a solid electrolite in hybrid solar cell, a modified chlorophyll with metal ions Zn2+ and Cu2+ has been shown to form a more stable I-V curve. It is characterized by its fill factor value greater than natural chlorophyll. Nevertheless, solar cells with natural chlorophyll has been able to produce higher efficiency values of chlorophyll were substituted.
Keyword: Hydrothermal, ZnO/Chlorophyll modified, Hybrid Solar Cell