A Polynomial Description of the Rijndael Advanced Encryption Standard

The paper gives a polynomial description of the Rijndael Advanced Encryption Standard recently adopted by the National Institute of Standards and Technology. Special attention is given to the structure of the S-Box.Comment: 12 pages, LaTe

Application of the parametrical surface-wave prediction model to rapidly varying wind fields during JONSWAP 1973

The capability of a parametrical surface wave model to predict the sea state on a small array for highly variable wind fields is shown for three examples. The model treats the wind sea, for which the nonlinear interaction is most effective, in a parametrical sense. The swell is propagated along characteristics, and the source function for the swell is assumed to be zero. The model output is compared with wave measure- ments from the JONSWAP 73 experimen

Sovereign-debt Renegotiations: A Strategic Analysis

The process of debt-rescheduling between a creditor and a sovereign (LDC) debtor is modeled as a noncooperative game built on a one-sector growth model. The creditor's threat to impose default penalties is ignored here as inherently incredible; instead, the debtor's motivation for repayment is to reap benefits from attaining an improved credit standing in international capital markets. The creditor can forgive portions of the outstanding debt so that a real-time bargaining process results with concessions being in the form of debt-service payments by the debtor and debt forgiveness by the creditor. Subgame-perfect equilibria of the game are characterized the main finding is that these all result in Pareto optima in which the creditor extracts all the surplus.

Some Inefficiency Implication of Generational Politics and Exchange

Generational selfishness is a central assumption in the vast literature on the life cycle model. Much of this literature deals with the impact of alternative government policies in light of self-interested generational behavior. Surprisingly, the choices of governments in virtually all of these analyses are assumed to be independent of the preferences of the selfish generations these governments presumably represent. We address this anomaly by modeling each generation as having a government that strictly represents the economy along a number of dimensions. We consider two types of inefficiencies that have received little or no attention in the literature. The first is the monopolization of factor supplies, and the second is the under- or overprovision of durable public goods. We demonstrate that selfish generations may place sizable marginal taxes on their factor supplies in order to monopolize their factor markets. We also show that selfish generations will provide inefficient levels of durable public goods both at the local and national levels. Finally, we demonstrate that generational inefficiencies can arise even in models of cooperative bargaining because of the first-mover advantage of earlier generations.

Hide and Seek in Arizona

Laboratory subjects repeatedly played one of two variations of a simple two-person zero-sum game of ``hide and seek.'' Three puzzling departures from the prescriptions of equilibrium theory are found in the data: an asymmetry related to the player's role in the game; an asymmetry across the game variations; and positive serial correlation in subjects' play. Possible explanations for these departures are considered.Minimax, mixed strategy, experiment

NUCLEAR AND ECONOMIC CHARACTERISTICS OF SEVERAL TWO-REGION HOMOGENEOUS REACTORS

The nuclear characteristics and fuel costs of a number of aqueous homogeneous reactors were estimated. Most of the reactors studied were cylindrical two-region powerbreeders variously having between 0 and 300 g/l of thorium in the core and between 500 and 1000 g/l of thorium in the blanket. The results of the calculations, including breeding ratios, fuel inventories, doubling tinnes, and net fuel costs, are summarized. (auth

Fabrication of titanium multi-wall Thermal Protection System (TPS) test panel arrays

Several arrays were designed and tested. Tests included vibrational and acoustical tests, radiant heating tests, and thermal conductivity tests. A feasible manufacturing technique was established for producing the protection system panels