Consider a database where each record has different access control policies. These policies could be attributes, roles, or rights that the user needs to have in order to access the record. Here we provide a protocol that allows the users to access the database record while: (1) the database does not learn who queries a record; (2) the database does not learn which record is being queried, nor t...

Rats' acquisition and transfer of performance in ambiguous discriminations was examined using discrete-trial operant lever-press procedures. Rats learned serial ambiguous discriminations (X----A+, A-; B+, X----B-) by acquiring both positive and negative occasion setting functions to the X feature. Mutual transfer occurred among cues from serial ambiguous, feature positive (Y----C+, C-), and fea...

In this paper, we introduce the concept of oblivious transfer with threshold access control. Namely, for each message in a database, the server associates an attribute set τ with it such that the message can only be available, on request, to the users who possess at least t attributes out of τ. Meanwhile, after the server and users execute the protocol, the server will not learn anything about ...

Abstract: People are very good at learning from instructions. Whenever a person receives a novel instruction, she can proactively build a plan in her head and then execute it with a very high accuracy. This proactive planning strategy gets faster over time. Here we test whether training people on proactive strategies will improve their abilities on other tasks that benefit from proactive approa...

The dynamics of electron transfer reactions in solution can be controlled with the use of a sequence of femtosecond laser pulses. In the charge transfer to solvent (CTTS) reaction of sodide (Na-) in tetrahydrofuran, an initial light pulse launched the CTTS reaction, ejecting an electron into either an immediate or a solvent-separated Na0:solvated electron contact pair. A second pulse was used t...

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One of the most common sources of performance limitation in the control of machine tools is associated to the resonant dynamics of the drive train, induced by the elasticity in some components. The design of the control system should guarantee a damped behavior of the load position, both in the setpoint response and in the rejection of the disturbances arising from the machining operation. In t...

This paper presents a new design of robust optimal controller for multivariable system. The row characteristic functions of a linear multivariable system and dynamic decoupling of its equivalent system, were applied to change the transfer function matrix of a closed-loop system into a normal function matrix, so that robust H optimal stability is guaranteed. Furthermore, for the decoupled equiva...

This paper takes advantage of nonuniqueness of the inverse problem for nonsquare transfer function matrices of multivariable systems in order to select such poles, if any, of a minimum variance control system that can either guarantee its closed-loop stability or provide (a sort of) robustness to the control system. As a result, new pole-free and stable-pole MVC designs are offered for nonsquar...

The hydroxylation or epoxidation of hydrocarbons by bacterial multicomponent monooxygenases (BMMs) requires the interplay of three or four protein components. How component protein interactions control catalysis, however, is not well understood. In particular, the binding sites of the reductase components on the surface of their cognate hydroxylases and the role(s) that the regulatory proteins ...