Monitoring the Status of Alaska Fishing Communities, 1980-2010

Commercial fishing provides social and economic benefits for hundreds of communities across Alaska, with dozens of species being harvested commercially. The state's fisheries are complex, with the species mix, vessels and gear, environmental conditions, and socioeconomic circumstances varying widely from one part of the state to another. And while the majority of Alaska's fisheries continue to be successfully managed for sustainable harvests, fishing communities face a number of challenges, including changing market conditions, volatile catches and stock dynamics, changes in fishery regulations, redistribution of access rights, and climate change.North Pacific Research Board

Optimal Cash Management Under Uncertainty

We solve an agent's optimization problem of meeting demands for cash over time with cash deposited in bank or invested in stock. The stock pays dividends and uncertain capital gains, and a commission is incurred in buying and selling of stock. We use a stochastic maximum principle to obtain explicitly the optimal transaction policy.Cash management, Stochastic control, Maximum principle, Risky assets

Alaskan fishing community revenues and the stabilizing role of fishing portfolios

Alaskan fishing community revenues and the stabilizing role of fishing portfolios, in Marine Policy, September 201

Forecast and decision horizons in a commodity trading model

Forecasts of demands or prices become increasingly unreliable as the future becomes more distant. It is, therefore, beneficial to show that optimal decisions during an initial time interval are either partially or wholly independent of the forecasted data from some future time onwards. Using a commodity trading model as an example, we obtain conditions that allow us to make optimal buying and selling decisions for a commodity in some initial time interval without knowing its price forecast beyond some future time. Such an initial time interval is called a decision horizon and the time up to which the forecasted data is required to make the optimal decisions during the decision horizon is called a forecast horizon. We use the maximum principle to solve the example and show that the decision and forecast horizons in the problem arise from lower and upper bounds imposed on the on-hand inventory of the commodity

Antiulcer Potential of the Ethanolic Extract of Aerva Persica Merrill Root in Rats

AbstractThe ethanol extract of the roots of Aerva persica (Burm f) Merrill (Amaranthaceae) was investigated to determine its antiulcer and in vivo antioxidant activities in albino Wistar rats. Ulcers were induced by ethanol and pylorus ligation. The extract was administered at the dose of 200mg/kg orally, p.o. for 15 consecutive days. The ulcer index of the ethanol extract was found to be significantly reduced compared with control animals. The effect was also assessed by determining the free acidity, pepsin activity, total carbohydrate (TC), and protein content (PK) in control, standard, and test group animals. The in vivo antioxidant activity was evaluated by determining the reduced glutathione level (GSH) and malondialdehyde (MDA) level in the tissue homogenates. The results reveal the significant reduction in the level of malondialdehyde and the increase in the level of reduced glutathione in the rats that received the ethanolic extract. Furthermore, histopathological studies have shown that pretreatment with the ethanolic extract of the roots of A persica reduces (100%) ethanol- and pylorus ligation-induced hemorrhagic necrosis in rats

Optimal Cash Management Under Uncertainty

We solve an agent's optimization problem of meeting demands for cash over time with cash deposited in bank or invested in stock. The stock pays dividends and uncertain capital gains, and a commission is incurred in buying and selling of stock. We use a stochastic maximum principle to obtain explicitly the optimal transaction policy

Optimal Cash Management Under Uncertainty

We solve an agent's optimization problem of meeting demands for cash over time with cash deposited in bank or invested in stock. The stock pays dividends and uncertain capital gains, and a commission is incurred in buying and selling of stock. We use a stochastic maximum principle to obtain explicitly the optimal transaction policy

Minimizing makespan in flowshops with pallet requirements: computational complexity

Studies the minimization in flowshops with pallet requirements. Importance of pallets in automated or flexible manufacturing environments; Mounting and dismounting of work pieces; Planning problems involved

Heuristic procedures for minimizing makespan and the number of required pallets

A heuristic procedure is developed for minimizing makespan in flow-shop scheduling problems. In comparison with current algorithms, our algorithm seems to result in an improved makespan with a small additional computational effort. An algorithm is also developed to minimize the required number of pallets for a given makespan