Judul: Label Cerdas Pendeteksi Escherichia coli dari Berbagai Indikator Warna
Abstrak: Kemasan cerdas merupakan kemasan yang mampu memberikan informasi mengenai kondisi serta kualitas dari produk yang dikemasnya. Penelitian ini dilakukan untuk membuat label yang dapat mendeteksi bakteri Escherichia coli. Penelitian pendahuluan dilakukan dengan mencari formulasi terbaik yang dapat menghasilkan label cerdas dalam waktu singkat dengan perubahan warna sebagai indikator adanya E.coli. Label pertama yaitu label PVA-EMB yang terdiri dari EMB agar, PVA, tapioka, agar bubuk, dan gliserol. Label ini dapat mendeteksi E.coli pada hari ketiga dengan perubahan warna dari merah muda kemudian timbul koloni berwarna hijau. Hal ini kurang memenuhi kebutuhan karena EMB agar itu sendiri dapat mendeteksi keberadaan E.coli dalam waktu 24 jam. Oleh karena itu dilakukan modifikasi agar label dapat mengalami perubahan warna akibat keberadaan E.coli. Label BHI-laktosa terdiri dari BHI broth, laktosa, methyl red, tapioka, agar bubuk, dan gliserol. Label ini tidak menimbulkan perubahan warna. Label ketiga yaitu label methyl red yang terdiri dari methyl red, tapioka, agar bubuk, dan gliserol. Label ini menghasilkan label yang cukup baik karena dapat berubah warna dalam waktu singkat. Selanjutnya dilakukan uji sensitifitas pada label methyl red terhadap E.coli dan uji kuantifikasi warna untuk mengetahui perubahan warna selama kurun waktu tertentu. Label mampu mendeteksi keberadaan E.coli dalam kurun waktu 9-12 jam dan mengalami perubahan warna dari jingga menjadi merah muda sampai merah terang.
Keyword: label cerdas, indikator, E.coli, methyl red

Judul: Pembuatan Label Cerdas Pendeteksi Escherichia coli
Abstrak: Intelligent packaging is the packaging that can monitor and provide the information about quality of the packed product. This study was aimed to produce a label with indicator Eosin Methylene Blue (EMB) to detect E.coli growth. Preliminary studies was carried out to obtain the main material for label which sensitive to E.coli. Type of material composed to (i) chitosan, (ii) chitosan + EMB; (iii) agar powder, (iv) agar powder + EMB; (v) agar powder + EMB + tapioca. Agar powder and EMB produced a label that more sensitive to E.coli growth compare to other materials. Selected materials consisted of agar powder, EMB and tapioca. The best formula consisted of 2% agar powder, 0,5% tapioca, 0.5% EMB and 1% glycerol. Concentration of EMB affected to number of colony and mold growth. The growth of E.coli in formula 2 had the highest number, in contrast, formula 1 had the lowest number in colony. The growth was about 120 cfu/600 cm2 and 50 cfu/600 cm2 respecively. Label responses in storage temperature showed that E.coli could grow at 5°C±3°C and 25±2°C. Application label for meat was carried out in coating method by sticking the label in meat surface and catching method by trapping the growth of E.coli surround the packaged. Labels had dye migration on coating methods. Catching method showed that the label captured vapor from E.coli fermentation on the surface of label. There were significant differences in the number of E.coli colonies trapped in each dilution at α = 5%. At dilution of 10-1, the number of E.coli colonies at the 24 hour and 48 hour of storage had significantly different compared to the number of E.coli colonies at 72 hour to 168 hour. At dilution of 10-2, the number of E.coli colonies at the 24 hour and 72 hour of storage had significantly different compared to the number of E.coli colonies at 96 hour to 168 hour.
Keyword: indicator, smart label, EMB, E.coli

Judul: Implementasi Jaringan Peer-to-Peer Tak Terstruktur Menggunakan Protokol JXTA
Abstrak: Internet is useful for communication, exchanging information, and businesses. Most internet network is based on client-server system, which is a centralized network. The server acts as the center of network and has the ability to transfer data as requested by the client. In a client-server system, the network will be down if the server is busy or interrupted. This disadvantage can be solved by Peer-to-Peer (P2P) network. In P2P network, client or “peer” can communicate with other peers without relying on the server. One of the P2P network protocols is JXTA protocol, an open source protocol that can connect mobile devices or computers to P2P network. The objective of this research was to implement the unstructured P2P application by using JXTA protocol and additional peer group. In this research, the features of investigated P2P application were chatting within peer group, searching for files, and downloading files. It was found that these features can only be performed by peers that were directly connected to other peers in the same subnet. Furthermore, this research showed that the highest percentage of overhead file was 10.13% and the percentage of overhead protocol did not exceed 0.5%
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