Judul: Coconut Leaves as Subtitutes of Coral Reefs for Fish Pots Cover
Abstrak: Ekosistem terumbu karang pada Desa Selat Nasik, Kecamatan Selat Nasik, Kabupaten Belitung menghadapi permasalahan yang disebabkan oleh praktik perikanan bubu tidak ramah lingkungan. Penggunaan bahan lain sebagai penutup bubu dapat membantu mengurangi kerusakan terumbu karang. Salah satu bahan alternatif adalah daun kelapa. Tujuan penelitian ini adalah membandingkan komposisi hasil tangkapan, ukuran ikan target dan berat hasil tangkapan di antara dua jenis bubu yang berbeda tutupan, yaitu bongkahan karang dan daun kelapa. Perbandingan dilakukan dengan analisis deskriptif kuantitatif. Penelitian ini bersifat eksperimen menggunakan dua unit bubu dengan tutupan daun kelapa (bubu A) dan dua unit bubu tutupan karang (bubu B), masing-masing unit dioperasikan dalam 12 trip operasi. Total ikan yang tertangkap bubu A sebanyak 87 ekor (8.950 gram) dan bubu B sebanyak 103 ekor (16.250 gram). Ikan target paling dominan yang tertangkap bubu A adalah swangi batu dengan jumlah 17 ekor (1.320 gram) dan bubu B adalah kakatua biru dengan jumlah 19 ekor (5.290 gram). Komposisi jenis ikan yang tertangkap terdiri dari 14 famili dengan 20 spesies dengan ikan target berjumlah 12 spesies, ikan indikator tiga spesies dan ikan mayor sejumlah lima spesies. Bubu tutupan daun kelapa lebih efektif digunakan untuk menangkap ikan target (swangi batu) dibandingkan bubu tutupan karang., Coral reefs in Desa Selat Nasik, Kecamatan Selat Nasik, Belitung were threatened by destructive fishing practices with fish pots covered by coral boulders. Alternative cover materials could help mitigate further damage of the reefs. Coconut leaves could be used as alternative materials. The aims of this study were to compare species composition, length and weight compositions, dominant species captured between two pots, i.e., coconut leaves (trap A) and coral boulders (trap B). Quantitative descriptive analysis was applied to achieve the aims. Two units of trap A and two units of trap B were operated simultaneously within twelve one-day-fishing trips. Trap A captured 87 pieces that weighed 8.950 gram while the trap B had 103 pieces (16.250 gram). Redcoat was the most dominant species (17 pieces; 1.320 gram) captured in 5 out of 12 fishing trips in trap A. Blue-barred parrotfish was the most dominant species with 19 pieces; 5.290 gram captured in 7 out of 12 fishing trips with trap B. 14 families of fish were caught in Desa Selat Nasik (20 species), target group was 12 species, indicator and major group were 3 and 5 species respectively. Coconut leaves cover was more effective than coral cover for catching Redcoats.
Keyword: alternative materials, catch composition, coconut leaves cover, coral cover, target species

Judul: Karung Goni Sebagai Alternatif Pengganti Terumbu Karang Dalam Pengoperasian Bubu Tambun di Perairan Pulau Karang Beras, Kepulauan Seribu
Abstrak: Pengoperasian bubu tambun di Perairan Kepulauan menggunakan terumbu karang sebagai penutup yang sekaligus berfungsi sebagai pemberat dan kamuflase lingkungan terumbu karang agar ikan tertarik masuk ke dalam bubu. Hal ini dapat menyebabkan kerusakan terumbu karang sebagai habitat ikan, sehingga perlu diupayakan alternatif solusinya. Salah satu solusinya adalah dengan mengganti terumbu karang menggunakan media tutupan alami lain, seperti menggunakan karung goni. Uji coba dilakukan selama 12 trip di Perairan Pulau Karang Beras, Kepulauan Seribu. Hasil tangkapan keseluruhan diperoleh sebanyak 655 ekor dengan bobot 57.090 gram, terdiri atas 453 ekor hasil tangkapan bubu nelayan dengan bobot 41.580 gram dan 202 ekor hasil tangkapan bubu perlakuan dengan bobot 15.510 gram. Ikan famili Scaride mendominasi hasil tangkapan utama bubu nelayan sebesar 32,67 % dengan frekuensi tertinggi pada selang panjang 14-15 cm. Hasil tangkapan utama bubu perlakuan didominasi oleh ikan famili Pomacentridae sebesar 30,20 % dengan frekuensi tertinggi pada selang panjang 13-14 cm. Bubu tambun dengan tutupan karung goni dapat digunakan sebagai alat penangkap ikan karang alternatif di perairan yang memiliki sumberdaya ikan famili Pomacentridae yang melimpah.
Keyword: Coral reefs, Gunny sack, trap fishing gear

Judul: Pengembangan Sistem Autentikasi Voter pada Central Legitimization Agency Menggunakan Media Mifare Smart Card®
Abstrak: Cryptography becomes one of the important things in the development of electronic voting system. The voting system using internet network technology aims to reduce considerable calculation time as well as necessary human resources. Securing lines of communication between voting machines and servers is needed to communicate securely. The identity of the voters, which is used for authentication voting process is stored in Mifare smart card called identity card. Every identity card which contains unique identification and nomor induk kependudukan will be authenticated in Central Legitimization Agency server. Card identity is hashed with SHA-2 and encrypted with session key to assure that the integrity of data is not changed by others. Session key is distributed from CLA to voting machines which are encrypted with asymmetric RSA algorithm. Only voting machines can decrypt the ciphertext to get the session key as plaintext. The list of the voters who are allowed to vote is stored in the CLA database. The decrypted plaintext must be identical to one of the voters in the voters list, for the voter to be able to vote. Only one vote for each of the voters can be casted. If the time limit is reached, CLA will distribute the vote count to the Central Tabulating Facilities. Considering the complexity in building a complete secure online election voting process, this research is only focused developing a system to authenticate the voter identity in CLA from identity card which is stored in Mifare smart card.
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