Judul: Management System of Troll Fisheries with Fish Aggregating Device (FAD) in PPP Pondokdadap Sendang Biru, Malang, East Java
Abstrak: Technical problems of troll fisheries operation with FAD is limited area for fishing activities because many FADs onshore, so the fishermen forced to make fishing operation in the more distant waters, about 50-200 miles of shoreline. The tendency of increasing fish prices in PPP Pondokdadap make many fisherman outside the area make catches in Sendang Biru fishing trolling areas and landing their catch in PPP Pondokdadap. This condition will certainly increase the fishing effort that have an impact on fish resources. Decreasing the size of the fish species like tuna are already beginning to be happened, and economically can reduce the selling price of fish that can be detrimental to fishermen. Not to mention the price influenced is done by pengambek (middlemen) at the time of purchasing the catch from the fishermen. The existence of economic dependency relationships between fishermen and pengambek make fishermen do not want to question the conditions that occur, thus adversely affecting the social conditions between fishermen and pengambek. Operation of trolling fisheries unit actually causes horizontal conflicts among fishermen. The conflict occurred due to a lack of cohesion among the fishermen to keep each other waters and fishery resources. The role of fishermen's organizations in particular fisheries institutional Rukun Jaya and government indispensable. The role of Rukun Jaya for society, especially for fishermen of troll fisheries in Sendang Biru is still lacking that needed improvement and active co-operation of all the components involved that the purpose of a good fishery system can be achieved optimally. Complexity of the problems in troll fisheries system with FADs in PPP Pondokdadap requires completion with attention-related aspects. Solving can be done with implementing the conceptual models. Conceptual models recommended in this study consists of 4, namely (1) developing and implementating of local regulation for monitoring, controlling, and survaillance of fishing ground in Southern water of Malang Regency, (2) manufacturing and using of SOP licensing by local government, (3) formulating the fishing operation of troll fisheries with FAD unit in PPP Pondokdadap, (4) monitoring the fish transaction mechanism in fish auction of PPP Pondokdadap. The implementation of the conceptual models can be done with a variety of strategies, involving all components of fisheries such as fisherman, pengambek, organization of fishermen and government.
Keyword: troll fisheries, fisheries system, soft system methodology

Judul: Keberlanjutan Perikanan Pancing Tonda menurut Dimensi Teknologi di PPP Pondokdadap, Malang, Jawa Timur
Abstrak: Pondokdadap fishing port has potential for tuna fisheries. In 5 years, Pondokdadap fishing port had produced 1.000 ton/year. This potential must be maintained in order to remain sustainable fisheries. Sustainability fisheries should be seen from ecological, economic, social, technological, and legal dimension. Technological dimension will be able to increase the value of the environmental, social and economic dimension. The purposes of this research were to describe the condition of troll line fisheries in Pondokdadap and to evaluate the sustainability of troll line fisheries in technology aspect. The status of troll line fisheries sustainability was derived by scoring the attributes from technological dimension. Those attributes are trip duration, landing sites, handling on board, vessel size, fishing gear selectivity and changing of fishing gear number. The catches from troll line vessels are yellowfin tuna, bigeye tuna, and skipjack. Based on the analysis of length at maturity analysis, there are 164 yellowfin tunas (75.35%) are worth catching and 51 tunas (24.65%) are not, 375 bigeye tunas (70.83%) are worth catching and 153 tunas (29.17%) are not, and also 174 skipjacks (53.87%) are worth catching and 149 skipjacks (46.13%) are not. Tuna that get an organoleptic score of 9 is 498 tunas (46.72%). Sustainability index score for troll lines fisheries in Pondokdadap fishing port is 57.87 which means quite sustainability.
Keyword: troll line, technology, Malang, sustainability

Judul: Penentuan Nilai Eigen dan Vektor Eigen dari Matriks Tridiagonal 2-Toeplitz dengan Pendekatan Polinomial Chebyshev
Abstrak: The eigenvalues and eigenvectors of a matrix can be determined by finding its characteristic polynomials. The characteristic polynomials of a tridiagonal 2-Toeplitz matrix is shown to be closely connected to polynomials which satisfy the Chebyshev recurrence relationship. If the order of the matrix is odd, then the eigenvalues are found explicitly in terms of the Chebyshev zeros and the eigenvectors are found in terms of the polynomials satisfying the recurrence relationship. For even ordered matrices, the situation is more complicated. The problem in these cases is that although the Chebyshev recurrence formula is still applied, its initial values are not generating Chebyshev polynomials
Keyword: