Judul: Strategy of Drift Gillnet Fisheries Bussines Development in Pekalongan Fishing Port
Abstrak: Kegiatan perikanan jaring insang hanyut menunjang usaha perikanan di Pekalongan, namun tingkat kesejahteraan nelayan jaring insang hanyut tergolong rendah. Tingkat keuntungan usaha belum diketahui secara pasti sehingga dibutuhkan strategi pengembangan usaha sebagai rekomendasi untuk meningkatkan usaha perikanan jaring insang hanyut di Pelabuhan Perikanan Nusantara Pekalongan. Tujuan penelitian ini menganalisis pengembangan jaring insang hanyut berdasarkan aspek teknis, ekonomi, serta menyusun strategi pengembangan perikanan jaring insang hanyut di PPN Pekalongan. Metode yang digunakan yaitu metode survei kemudian dianalis menggunakan analisis deskriptif, analisis finansial, dan analisis SWOT. Hasil penelitian menunjukkan usaha perikanan jaring insang hanyut dengan kapal ≤10 GT menggunakan antara 20-35 piece jaring dilengkapi dengan line hauler, volume produksi per unit jaring insang hanyut rata-rata 302.540 kg per tahun dengan nilai produksi Rp 4.282.497.291. Keuntungan usaha sebesar Rp 122.554.616; R/C ratio sebesar 1,51 dan Payback Period sebesar 1,88. Strategi pengembangan jaring insang hanyut di PPN Pekalongan diantaranya mengembangkan jaringan pasar, pembinaan nelayan terkait usaha peluang pasar, peningkatan kapasitas SPBU, pembagian zonasi penangkapan ikan, peningkatan pemahaman mengenai perikanan yang berkelanjutan, dan penerapan sistem rantai dingin terhadap hasil tangkapan., Drift gillnet fishery activities support fisheries business in Pekalongan, but the welfare of drift gillnet fishermen is still relatively low. The profit of those business is not known, so a business development strategy is needed as a recommendation to increase the drift gillnet business at Pekalongan Fishing Port. The purpose of this study is to analyze the development of drift gillnets based on technic aspect, economic aspects, and develop strategies for developing drift gillnet fisheries at Pekalongan Fishing Port. The method that used in this research is survey with descriptive analysis, business prospect analysis, and SWOT analysis. The result showed that drift gillnets ≤10 GT using 20-35 piece of nets and already applied line hauler. The volume production of drift gillnet fishery per unit averages is 302.540 kg per year with production value Rp122.554.616, R/C ratio 1,51 and a payback period 1,88. The strategy for developing fisheries at the Pekalongan Fishing Port includes developing markets networks, fostering fishermen related to business and market opportunities, increasing gas station capacity, dividing fishing zoning, increasing the understanding of suistainable fisheries, and application of cold chain systems within catch.
Keyword: jaring insang hanyut, Pelabuhan Perikanan Nusantara Pekalongan, strategi pengembangan, usaha perikanan

Judul: Efficiency of Fishing Supply Production Factors on Drift Gillnet Fishing Vessels of 41-60 GT in Tegalsari Coastal Fishing Port
Abstrak: Dalam kegiatan penangkapan ikan, permasalahan yang sering kali terjadi ialah kurangnya perbekalan saat operasi kegiatan penangkapan. Penelitian ini bertujuan untuk mengidentifikasi kondisi umum, menghitung kebutuhan perbekalan aktual, dan menganalisis efisiensi faktor produksi perbekalan melaut unit penangkapan jaring insang hanyut berukuran 41-60 GT di Pelabuhan Perikanan Pantai (PPP) Tegalsari. Penelitian dilakukan melalui observasi secara langsung dan wawancara terhadap nelayan, pengurus, dan pemilik kapal menggunakan metode purposive sampling. Hasil penelitian ini menunjukkan bahwa unit penangkapan tersebut beroperasi selama 2-3 bulan dengan hasil tangkapan utama berupa ikan tongkol dan ikan tenggiri. Jenis perbekalan yang digunakan ialah perbekalan operasional yang terdiri dari solar, oli, air bersih, dan perbekalan konsumsi yang terdiri dari konsumsi dan lainnya. Perbekalan melaut yang dibawa masih tergolong tidak efisien, karena efisiensi Nilai Produksi Marginal (NPM) yang diperoleh masing-masing sebesar 1,153 pada solar, 10,866 pada air bersih, dan 0,010 pada perbekalan konsumsi., In fishing activities, a common issue that often occurs is the lack of supplies during the operation of fishing activities. This research aims to identify the general conditions, calculate the actual supply needs, and analyze the efficiency of fishing supplies on drift gillnet fishing vessels sized on 41-60 GT at the Tegalsari Coastal Fishing Port. The research was conducted through direct observation and interviews with fishermen, managers, and ship owners using the Purposive Sampling method. The results of this study indicate that the fishing vessels operate for 2-3 months with the main catch being skipjack tuna and mackerel. The types of supplies used are operational supplies consisting of diesel, oil, fresh water, and consumable supplies consisting of food and others. The supplies carried are still classified as subefficient, as evidenced by the Marginal Production Value (MPV) efficiency obtained each of the variabels at 1.153 for diesel, 10.866 for fresh water, and 0.010 for consumable supplies.
Keyword: drift gillnet, drift gillnet fishing supply, efficiency

Judul: Pelabelan Super Vertex Magic
Abstrak: Super vertex magic labeling is labeling on graph with is a set of edges mapped into and is a set of vertices mapped into . It has a vertex magic labeling in which and represents the size and order of the graph respectively. This manuscript proves that paths, cyclics, and disjoint union of cyclics have a super vertex magic labeling. There are four theorems to be discussed. The first theorem proves that path is super vertex magic if and only if is odd and . The second theorem proves that cyclic is super vertex magic if and only if is odd. The third theorem proves that bijection function from an edge set onto of graph can be extended to a super vertex magic labeling if and only if the set amount of edge label that incidents with a vertex in the graph, consists of sequential integers as many as vertices in the graph. The fourth theorem proves that disjoint union of the cyclics consists of cyclics with each cyclic has vertices is super vertex magic if and only if and are odd.
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