– Shared control represents a middle ground between supervisory control and traditional bilateral control in which the remote system can exert control over some aspects of the task while the human operator maintains access to low-level forces and motions. Our telema-nipulation system includes tactile, force and motion sensors that allow the slave to regulate grasp forces and impart rolling moti...

In his recent TREE news & comment, Watkinson1 drew attention to the role of soil microorganisms in plant population dynamics. In particular, he reported on the dynamical framework for the inter-relations between the composition of plant and soil communities, proposed last year by Bever et al.2 It is worth adding allelopathic interactions to this picture. Allelopathy has been defined by Rice3 as...

A~-This paper compares two implementation models for abstract data types: direct and indirect implementations. Direct implementations offer relatively cheap execution and expensive compilation costs while indirect implementations result in relatively expensive implementations and cheap compilation costs. These two models are both accommodated by Ada, and a small experiment compares their costs ...

Shared control represents a middle ground between supervisory control and traditional bilateral control in which the remote system can exert control over some aspects of the task while the human operator maintains access to low-level forces and motions. In the case of dexterous telemanipulation, a natural approach is to share control of the object handling forces while giving the human operator...

I develop an analytical general-equilibrium model to explain economic sources of businesscycle pattern of aggregate stock market returns. With concave production functions and capital accumulation, a technology shock has a pro-cyclical direct effect and a counter-cyclical indirect effect on expected returns. The indirect effect, reflecting the “feedback” effect of consumers’ behavior on asset r...

A simple device is described which both facilitates and significantly extends the scope of indirect ophthalmoscopy.