Judul: Penggerombolan Dua Tahap Ikan Tembang (Sardinella fimbriata) di Perairan Teluk Banten
Abstrak: Sardinella fimbriata as known as Ikan Tembang is the common resources of PPN Karangantu, Banten. Ikan Tembang become prior target catches by Karangantu’s fishermen because of the high demand. Sampling in May to August 2012 had been done to evaluate morphological characteristics of fish. This study aims to clustering Ikan Tembang in Teluk Banten using two step cluster method and identifying the morphological characteristics in that clusters. Identifying the character of fish is used to know the right fish to catch without examining the development of gonad maturity. The morphological characteristics of Ikan Tembang are measured by categorical and continuous scale. The number of observation is 760. There are three optimum clusters which clustered by length, weight and gonad maturity (TKG) of Ikan Tembang. The right fish to catch based on TKG is the thrid cluster, the ready to spawn phase and already to spawn phase. Third cluster marked by 150.35 mm avarage length and 42.72 grams avarage weight. There are 70% overfishing samples that clustered in first cluster and second cluster.
Keyword: mixed measurement scales, two step cluster.

Judul: Kajian Stok Sumberdaya Ikan Tembang (Sardinella fimbriata Valenciennes, 1847) di Perairan Teluk Banten yang Didaratkan di PPN Karangantu, Banten
Abstrak: Sardinella fimbriata atau fringescale sardine atau ikan tembang menjadi salah satu sumberdaya ikan yang dimanfaatkan. Hasil tangkapan ikan tembang di PPN Karangantu, Banten menurun dari tahun ke tahun. Oleh karena itu diduga ikan tembang di perairan Teluk Banten telah mengalami eksploitasi berlebih. Tujuan penelitian ini adalah untuk mengetahui status ikan tembang melalui beberapa parameter dinamika populasi ikan agar dapat dijadikan pertimbangan dalam pengelolaan sumberdaya ikan tembang. Pola pertumbuhan ikan tembang di Teluk Banten bersifat allometrik positif. Hasil pemisahan kelompok umur menggunakan metode NORMSEP menunjukkan ikan tembang terdiri dari dua kelompok umur dengan L∞189.0675 mm untuk ikan betina dan 191.6537 mm untuk ikan jantan. Laju eksploitasi (E) mengindikasikan bahwa sumberdaya ikan tembang telah mengalami eksploitasi berlebih. Dugaan pertama kali ikan tembang matang gonad adalah 161 mm. Informasi ini dapat di jadikan dasar alternatif pengelolaan yakni pengaturan penangkapan yang ukurannya lebih dari 161 mm agar ikan-ikan tersebut dapat memijah setidaknya satu kali agar lestari dan berkelanjutan.
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Judul: Comparison of HIV Model with and without Time Delay
Abstrak: Acquired immunodeficiency syndrome (AIDS) is the reduction of the human immune system. AIDS is caused by human immunodeficiency virus (HIV). No medicine has been found for this desease until recently. An AIDS therapy is usually performed with highly active antiretroviral therapy, namely reverse transcriptase inhibitors, protease inhibitors and combination of both. Various models have been developed to explain the immune system of patients with AIDS, namely the HIV, response and the time delay model. This paper discusses the comparison between the dynamics of the HIV virus, the dynamic response of protease inhibitors and dynamics of time delay. The dynamics model of HIV is influenced by the level of white blood cells produced and the rate of its death. Dynamics of protease inhibitors on the response and the time delay model is influenced by the death rate of infected white blood cells and the failure rate of treatment.
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