Judul: Shelf Life Prediction of Melinjo Chips Using Critical Moisture  Content Approach
Abstrak: Emping melinjo adalah makanan olahan khas daerah Banten yang berpotensi dalam pertumbuhan ekonomi. Setiap industri pangan wajib mencantumkan informasi umur simpan. Emping melinjo rentan mengalami kerusakan karena peningkatan kadar air saat penyimpanan. Sehingga perlu dilakukan pendugaan umur simpan emping melinjo dengan pendekatan kadar air kritis. Tujuan dari penelitian ini adalah untuk mengidentifikasi karakteristik produk emping melinjo, mendapatkan kadar air kesetimbangan pada RH tertentu, model persamaan sorpsi isotermis yang tepat, dan umur simpan pada kemasan aluminium foil dan PP. Hasil penelitian menunjukkan karaterikstik emping melinjo sudah memenuhi standar SNI. kadar air kesetimbangan produk meningkat berbanding lurus dengan kelembaban relatif. Model yang tepat menggambarkan kurva sorpsi isotermis emping melinjo adalah model Henderson. Emping asin original memiliki umur simpan berturut-turut pada kemasan aluminium foil dan PP yaitu 173 hari dan 48 hari pada RH 75%, serta 151 hari dan 42 hari pada RH 80%. Emping pedas manis memiliki umur simpan 129 hari dan 36 hari pada RH 75%, serta 113 hari dan 32 hari pada RH 80%., Melinjo chips are a processed food of the Banten which has potential in economic growth. Every food industry has to include shelf life information. Melinjo chips are susceptible to damage due to increased water content during storage. So it is necessary to estimate the shelf life of melinjo chips using a critical water content approach. The aim of this research is to identify the characteristics of melinjo chips products, obtain the equilibrium water content at a certain RH, the correct isothermic sorption equation model, and the shelf life of the melinjo chip in aluminum foil and PP packaging. The results of the research show that the characteristics of melinjo chips already meet SNI standards. The equilibrium moisture content of the product increases in direct proportion to the relative humidity. Henderson model is the correct model to describes the isotheric sorption curve of melinjo chips. The shelf life of the original salty melinjo chips is 173 days in aluminum foil packaging and 48 days in PP packaging at 75% RH. At 80% RH, the shelf life is 151 days in aluminum foil packaging and 42 days in PP packaging. As for the sweet-spicy melinjo chips, their shelf life is 129 days in aluminum foil packaging and 36 days in PP packaging at 75% RH, while at 80% RH, the shelf life is 113 days in aluminum foil packaging and 32 days in PP packaging.
Keyword: melinjo chips, critical moisture content, relative humidity, shelf life

Judul: Estimation of Shelf Life Banana Chips “Barong Chips” with the Accelerated Shelf-Life Testing (ASLT) Method
Abstrak: Keripik pisang “Barong Chips” merupakan salah satu produk olahan pisang dari Desa Klirong, Kecamatan Klirong, Kabupaten Kebumen, Jawa Tengah. Keripik pisang dapat mengalami penurunan mutu selama penyimpanan akibat pengaruh kondisi lingkungan seperti RH, oksigen, kemasan, dan suhu penyimpanan, sehingga perlu dilakukan pencantuman informasi umur simpan. Penelitian ini bertujuan mengetahui karakteristik awal, mengidentifikasi penurunan mutu selama penyimpanan, dan melakukan pendugaan umur simpan. Pengamatan dilakukan terhadap produk yang dikemas menggunakan plastik polypropylene dengan tebal 0,05 dan 0,08 mm, pada tiga suhu yaitu 25 , 35 , dan 45ºC selama 8 minggu. Parameter yang diamati yaitu kadar air, asam lemak bebas (FFA), kekerasan, dan kecerahan warna setiap 7 hari sekali. Karakteristik awal keripik pisang yang digunakan memenuhi SNI 01-4315-1996, kecuali kadar lemak. Hasil penelitian menunjukan perubahan mutu berupa peningkatan kadar air dan FFA, serta penerimaan panelis. Pendugaan umur simpan dilakukan berdasarkan parameter yang menyebabkan produk cepat rusak yaitu laju peningkatan kadar air. Umur simpan keripik pisang “Barong Chips” pada suhu ruang (30ºC) yaitu 84 hari., “Barong Chips” is one of banana chips produced by a small scale enterprise Klirong Village, Kebumen, Central Java. Banana chips quality will decrease during storage time due to the influence of environmental conditions such as RH, oxygen, packaging, and storage temperature, so it is necessary to include information on shelf life. The study objective are determining the initial characteristics of “Barong chips”, identifying its quality changes during storage time, and estimating its shelf life. The research was conducted by storing the product that packed in 0,05 and 0,08 thickness polyprophylene film, at three level of temperatures, i.e. 25 , 35 , and 45ºC for 8 weeks. The parameters observed were moisture content, free fatty acid (FFA), hardness, and color brightness every 7 days. The initial characteristics are appropriate to quality standards, except for fat. The result showed changes in the form of an increase in water content and FFA, as well as panelist acceptance. Estimation of shelf life is carried out based on the parameters that cause the product to spoil quickly, the rate of increase air content. The shelf life of “Barong Chips” banana chips at room temperature (30ºC) is 84 days.
Keyword: ASLT, “Barong Chips”, packaging, shelf life

Judul: Penyusunan Overlap Graph menggunakan Suffix Tree pada DNA Sequence
Abstrak: The DNA sequence assembly is very important in genome analysis. This step aims to reconstruct contigous DNA fragment (contigs) from short fragment by concatenating fragments based on the overlap region among them. This method employs overlap graph for solving the problems. In this graph, nodes represent fragments and edges represent overlap. This research developed a software for constructing overlap graph using suffix tree. The evaluation was conducted by measuring the number of nodes, number of edges, and the execution time in many values of minimum overlap. The minimum overlap is defined as the minimum length of substring which is considered as the overlap region between two fragments. The evaluation results showed that the number of nodes, the number of edges, and the execution time were increased with the decreasing of the minimum overlap value.
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