Judul: Pengaruh Penangkapan Ikan terhadap Komposisi Tingkat Trofik (Trophic Level) di Kepulauan Seribu
Abstrak: Trophic level is a structure of organism in food chain. The using both selective or non selective fishing gears has potential effects on the food chain. Thus, the important question is whether the caught at a certain trophic level relate to the used fishing gears. The study aimed: (1) to describe the status of fisheries in Seribu Islands; (2) to determine the composition of caught based on fishing gear types; and (3) to identify the potential impacts on ecosystem. The result of this study showed that the major fishing gears in Seribu Islands were seine net, muroami, gill net, hook and line as well as „bubu tambun‟ (trap). Most of the catch in the study area were redbelly yellowtail fusilier and goldlined spinefoot; the average length were 19 ± 4,0 cm and 22,4 ± 1,5 cm respectively. Further more, the average weight were redbelly yellowtail fusilier (110,6 ± 103,7 gr) and goldlined spinefoot (163,6 ± 58,5 gr). Majority, trophic level of catch was carnivores which prey the smaller fish and cephalopods (TL5: 4.0 – 4.5) e.g. frigate mackerel. This study has indicated that there was an impact of fishing on the ecosystem, particularly the balance of the food chain.
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Judul: The Impact of Trap and Fishing Lines on Fish  Resources in the Waters of Harapan Island, Kepulauan Seribu, Jakarta
Abstrak: Penggunaan bubu dan pancing di Perairan Pulau Harapan Kepulauan Seribu mengakibatkan ikan juvenile banyak tertangkap. Hal ini karena bubu tidak memiliki celah pelolosan ikan dan pada pancing ukuran mata pancing terlalu kecil. Intensitas penangkapan ikan yang semakin tinggi dapat berdampak negatif bagi kelestarian stok ikan dan keseimbangan rantai makanan. Penelitian ini bertujuan untuk mendeskripsikan konstruksi alat tangkap bubu dan kelompok pancing (pancing ulur, pancing kotrek, dan pancing rawai) yang berbasis di Pulau Harapan, Kepulauan Seribu; mendeskripsikan karakteristik hasil tangkapan bubu dan kelompok pancing (spesies, ukuran layak tangkap, jumlah individu, dan komposisi) di Perairan Kepulauan Seribu, khususnya yang didaratkan di Pulau Harapan; dan mengestimasi dampak perikanan bubu dan kelompok pancing terhadap ikan target dan keseimbangan rantai makanan. Hasil penelitian menunjukkan bubu kawat memiliki panjang 137 cm, lebar 97 cm, dan bukaan mulut 35 cm. Kail pancing yang digunakan adalah kail pancing nomor 7. Kapal yang digunakan pada kedua alat tangkap ini yaitu kapal fiber. Nilai indeks keragaman Shannon-Wiener tangkapan alat tangkap bubu sebesar 2,56 dan pada pancing sebesar 0,77. Ikan yang memiliki nilai panjang pertama kali matang gonad (Lm) sama dengan metadata fishbase yaitu ikan pisang-pisang (Lutjanus vitta) dengan porsi ukuran layak tangkap sebesar 70%. Ikan kerapu lumpur (Epinephelus coioides), Ikan tenggiri (Scomberomorus commerson), dan ikan baronang garis (Siganus javus) memiliki nilai Lm penelitian lebih kecil dibanding metadata fishbase. Tangkapan ikan didominasi tingkat trofik TL3 dan TL2. Secara teori, jika hal ini terus berlanjut akan mengancam keberlanjutan sumberdaya ikan pada semua tingkat trofik (rantai makanan)., The use of traps and fishing lines in the waters of Harapan Island, Kepulauan Seribu resulted in many juvenile fish being caught. This is because the trap does not have a gap for the fish to escape and the hook size is too small on the fishing line. Higher fishing intensity have a negative impact on the sustainability of fish stocks and the balance of the food chain. This study aims to describe the construction of trap fishing gear and fishing lines (handline, hook and line, and longline) based on Harapan Island, Kepulauan Seribu; to describe the characteristics of traps and fishing lines catches (species, allowable catch size, number of individuals, and composition) in the Kepulauan Seribu waters, especially those landed on Harapan Island; and estimating the impact of trap fisheries and fishing lines group on target fish and the balance of the food chain. The results showed that the wire traps had a length of 137 cm, a width of 97 cm and a mouth opening of 35 cm. The fishers used a fishing hook with number of 7. The ship used for these two fishing gears was a fiber boat. The Shannon-Wiener diversity index value for trap catches was 2.56 and for fishing lines was 0.77. The fish with the length at first maturity (Lm) was similar with Fishbase metadata, i.e. Brownstripe red snapper (Lutjanus vitta) with an allowable catch size portion of 70%. Orange-spotted grouper (Epinephelus coioides), Narrow-barred Spanish mackerel (Scomberomorus commerson), and Streaked spinefoot (Siganus javus) were a smaller Lm values than Fishbase metadata. The fish catches were dominated by the catches of TL3
Keyword: Wire traps, Fishing lines, Fishing impact, Allowable catch size, Trophic  level

Judul: Simulasi Protokol Autentikasi Pelanggan pada Voice Privacy
Abstrak: Existing design of the telephone public network is susceptible to eavesdropping on its voice stream. Consequently, any wire taper can listen to supposedly private conversation. In order to prevent such eavesdropping, we propose a protocols and its implementation for end-to-end voice privacy authenticate as a service available for interested subscribers. Our protocols consist of customer enrollment system, customer authentication system and simulation voice privacy. Protocols that we made are adaptation from Sharif and Wijekesera journal with the title Providing Voice Privacy as a Service over the Public Telephone Network. The result of the process shows how the customer enrolls and how the system process the password, how the system authenticate customer simulate voice privacy.
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