Judul: Analisis Segmentasi Pelanggan Eceran Pt United Tractors Tbk. Dengan Pendekatan Analisis Gerombol
Abstrak: Segmentasi pelanggan merupakan kegiatan membagi pelanggan ke dalam segmen-segmen dengan ciri dari tiap segmen memiliki karakter yang relatif homogen, sehingga dapat dij adikan sebagai salah satu alat yang digunakan untuk menentukan strategi pemasaran yang efisien berdasarkan basil segmentasinya. Segmentasi dilakukan dengan menggunakan metode k-means dan peubah yang menj adi dasar segmentasi yaitu nominal transaksi yang dibayarkan oleh 844 pelanggan eceran untuk pembelian 22 komoditas suku cadang. B anyaknya segmen (k) ideal yang terbentuk yaitu 5 segmen berdasarkan perubahan indeks Hartigan terbesar yaitu sebesar 1 8. 9 5. Dari 5 segmen yang diperoleh, terdapat segmen yang diprioritaskan dan tidak diprioritaskan dalam melalukan pemasaran produk. Segmen 2 dan Segmen 4 merupakan segmen yang dapat diprioritaskan dengan cirinya adalah nilai rataan nominal transaksi yang dibayarkan oleh tiap pelanggan eceran pada Segmen 2 dan Segmen 4 lebih besar dibandingkan nilai rataan nominal transaksi yang dibayarkan oleh tiap pelanggan terhadap total pelanggan eceran selama tahun 20 1 3 sampai 20 1 5. S elain itu, persentase kontribusi terhadap penerimaan UT lebih besar dibandingkan rata-rata persentase kontribusi tiap segmen yaitu sebesar 4 5. 24% oleh Segmen 2 dan 2 9. 7 1 % oleh Segmen 4. Dengan demikian, Segmen 2 dapat menj adi prioritas utama UT dalam melakukan pemasaran produknya.
Keyword: indeks Hartigan, metode k-means, segmentasi pelanggan.

Judul: Segmentasi pelanggan ritel perusahaan alat berat berdasarkan catatan transaksi dengan pembobotan komponen utama
Abstrak: Customer segmentation is allocation of customers into segments according to characteristics similarity to optimize the implementation of customer relationship management. The characteristics of retail customer could be identified based on their transaction record. Principal component analysis is used to summarize the characteristics of PT United Tractors Tbk. spare part retail customer from transaction record in 2012. Variables in the transaction analysis and segmentation are transaction frequency ( ), count of transaction months ( ), count of product ( ), count of product type ( ), and total transaction amount ( ). The weight of those variables are determined by principal component analysis. The weight of each variable obtained is 0.41 for , 0.78 for , 0.61 for , 0.28 for , dan 0.72 for . Transaction score of each customer is calculated by combining the standardized transaction variables. Ideal segmetation is conducted by k-means algorithm. The ideal number of segment is 4. The mean of transaction score for segmen 1 to 4 are 9.09, 3.34, -1.39, and 0.27. Customers are devided into 4 segments by percentage 2.79%, 12.09%, 54.88%, and 30.23% for segment 1 to 4.
Keyword: Bogor Agricultural University, retail customer segmentation., principal component analysis, customer relationship management, cluster analysis

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