Abstract. We have designed and implemented a type inference algorithm for the Self language. The algorithm can guarantee the safety and disambiguity of message sends, and provide useful information for browsers and optimizing compilers. Self features objects with dynamic inheritance. This construct has until now been considered incompatible with type inference because it allows the inheritance graph to change dynamically. Our algorithm handles this by deriving and solving type constraints that simultaneously define supersets of both the possible values of expressions and of the possible inheritance graphs. The apparent circularity is resolved by computing a global fixed-point, in polynomial time. The algorithm has been implemented and can successfully handle the Self benchmark programs, which exist in the “standard Self world ” of more than 40,000 lines of code.

The design of the System Performance Advisor (SPA) expert system is described. The purpose of SPA is to assist a system administrator in system performance management. Generally, system performance management can be described as those activities performed by a system administrator to ensure a computer system is providing as much of its capacity as possible for the use of its users. Traditionally, system performance management duties have been performed exclusively by a human system administrator in an ad hoc fashion. These performance management duties have been made more complex with the introduction of large networks of computer systems. SPA assists in performing these duties by attempting to locate the source of performance problems within a network of UNIX computer systems and then notifying the system administrator. SPA makes diagnoses about hosts and processes by monitoring current levels of activity and maintaining a history of these activity levels. By comparing historical know...

Numerical and experimental methods are described for the investigation of an oscillating-wing generator or wingmill. The numerical approach applies a previously developed, unsteady, incompressible panel method incorporating a non-linear, deforming wake model to compute the unsteady flow about an airfoil undergoing specified pitch and plunge motions. An experimental model is described which can duplicate much of the parameterspace available to the panel method. Numerical results are presented demonstrating configurations that yield high efficiencies. Results are compared to the wingmill experiments of McKinney and DeLaurier. NOMENCLATURE A area swept out by the wing, in terms of c 2 CD drag coefficient, drag=(q 1S) CL lift coefficient, lift=(q 1S) CM moment coefficient about x p , moment=(q1Sc) CP power coefficient, power=(q1SV1 ) = CL y + CM ff CP I ideal power coefficient, P I =(q 1SV1 ) CPT total power coefficient, PT =(q 1SV1 ) c chord length f oscillation frequency in ...

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report was prepared as a result of work sponsored by the California Energy Commission (Commission). It does not necessarily represent the views of the Commission, its employees, or the state of California. The Commission, the state of California, its employees, contractors, and subcontractors make no warranty, express or implied, and assume no legal liability for the information in this report; nor does any party represent that the use of this information will not infringe upon privately owned rights. This report has not been approved or disapproved by the Commission nor has the Commission passed upon the accuracy or adequacy of the information in this report. PREFACE The Public Interest Energy Research (PIER) Program supports public interest energy research and development that will help improve the quality of life in California by bringing environmentally safe, affordable and reliable energy services and products to the marketplace. The PIER Program, managed by the California Energy Commission (Commission), annually awards up to $62 million of which $2 million/year is allocated to the Energy Innovation Small Grant (EISG) Program for grants. The EISG Program is administered by the San Diego State

This Article is brought to you for free and open access by the Political Networks Paper Archive at OpenSIUC. It has been accepted for inclusion in Working Papers by an authorized administrator of OpenSIUC. For more information, please contact jnabe@lib.siu.edu. Coalition Portfolios and Interest Group Influence over the Policy Process