Most existing flow visualization techniques focus on the analysis and visualization of the vector field that describes the flow. In this paper, we employ a rather different approach by performing tensor field analysis and visualization on the gradient of the vector field, which can provide additional and complementary information to...
Visualizing asymmetric tensors is an important task in understanding fluid dynamics. In this paper, we describe topological analysis and visualization techniques for asymmetric tensor fields on surfaces based on analyzing the impact of the symmetric and antisymmetric components of the tensor field on its eigenvalues and eigenvectors. At the core...
The sandfish catch in the coastal waters off Akita Prefecture has fluctuated largely over the last 40 years. It began to decrease in the middle 1970s, and in 1991 it heavily depleted by 70 tons, which corresponds to less than 1% of the catch in the 1960s. The Fisheries Cooperative...
The Indian Ocean tsunami of 26 December 2004 severely affected six provinces (Ranong,Phang-nga, Phuket, Krabi, Trang and Satun) on the Andaman Sea coast of Thailand. About 27,000 fish cage culture operators in the Andaman coastline were affected by the tsunami impact, covering a total cage area of some 1,123,176 square...
The paper analyses the annual accounts for the period 1990-94 of a sample of approximately 100 fishing firms operating out of ports in Schleywig-Holstein and exploiting finfish stocks in the North Sea and Baltic, and shrimp stocks in the North Sea. Detailed information is provided on costs and returns by...
The long history of the van chai system of Vietnam began several centuries ago with their establishment mainly in the lower and middle reaches of rivers northern Vietnam and in coastal lagoons in Central Vietnam, whereas those in marine embayments, like Ha Long Bay, and in enclosed coastal areas, like...
This paper attempts to determine and analyze the factors affecting the value chain of tuna commodity in the Philippines. It also identifies the key players in the industry, and their roles and contributions in the value chain. The paper will utilize both primary and secondary data in the analysis. Secondary...
It is generally recognised that market-based instruments have a strong role to play in improving the efficiency of fisheries management. This belief was strongly reinforced at the 2002 IIFET Conference, where the use of ITQ systems was extensively discussed. While ITQ systems are commonly referred to as “rights-based management” (RBM),...
Multiobjective decision analysis (MDA) is a useful assessment method when fishery managers need a systematic investigation of the trade-offs involved in the selection of alternative policy options. An important class of techniques within MDA is vector optimization, consisting of mathematical programming models with vector valued objective functions. From the management...