Judul: Data Survival Waktu Tunggu Mendapatkan Pekerjaan Pertama Menggunakan Metode Eksponensial dan Weibull
Abstrak: Dalam kehidupan sehari-hari manusia selalu berhubungan dengan waktu, salah satu contoh yaitu jangka waktu alumni dari kelulusan hingga mendapatkan pekerjaan. Data ini tidak bisa diamati secara utuh atau tersensor karena ada objek yang tidak mendapatkan pekerjaan hingga akhir pengamatan, sehingga diperlukan metode yang sesuai. Dalam karya ilmiah ini digunakan dua metode parametrik yaitu metode Eksponensial dan Weibull untuk menganalisis waktu tunggu mendapatkan pekerjaan pertama dari alumni Departemen Matematika, FMIPA IPB tahun masuk 1998 s/d 2003. Tingkat survival metode Eksponensial dapat dicari dengan persamaan..()tSte£f.= sedangkan metode Weibull ...()tSte£^£f.= dengan .£f adalah parameter scale, .£^ adalah parameter shape dan t adalah waktu survival. Berdasarkan hasil analisis data yang digunakan, metode Weibull lebih sesuai daripada metode Eksponensial. Sedangkan hasil analisis metode Weibull, covariate yang berpengaruh nyata terhadap waktu tunggu mendapatkan pekerjaan pertama adalah usia dan IPK.
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Judul: Penerapan Regresi Cox pada Lama Waktu Tunggu Lulusan Program Studi S1 Statistika IPB Memperoleh Pekerjaan Pertama.
Abstrak: The number of unemployment graduate students is increasing by 0.32 percent from February 2013 until February 2015 (BPS 2015). Institut Pertanian Bogor (IPB) as the university of Statistics graduates maker resulting in Statistics graduates that are needed in various work fields, but the company has qualification in selecting the workforce. Consequently Statistics program graduates tend to be in unemployment status because the amount of time for getting the uncertain first job. Therefore this research aim is to identify variables associated with the amount of waiting time of IPB’s Statistics undergraduates program for getting their first job and identify the relation between GPA and their first job field. The data used is primary data through questionnaires. The unemployment graduates that have not worked until the end of research time on April 2015 and continue their master study is called by censored data. The analysis relating to the amount of waiting time and censored data is survival analysis with Cox regression while correspondence analysis is used for knowing the relation between GPA and the first job. Variables associated with the amount of waiting time to obtain first job is sex and GPA in the 5% significance level. Correspondence analysis showed that the Ministry, Otoritas Jasa Keuangan (OJK), and Pertamina are works field of IPB’s Statistics program study graduates who have GPA greater or equal to 3.5.
Keyword: censored data, correspondence analysis, Cox regression, first job

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