Niv Ahituv
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Top Management Toolbox For Managing Corporate IT
These checks and balances prevent project runaways and deliver systems that further corporate strategy and performance.
A model for predicting and evaluating computer resource consumption
Evaluation and prediction of computer resource consumption can aid in the determination of computer selection and configuration planning as well as in the usefulness and maintenance of existing systems. The model presented can be used in a "What If" mode to make these determinations.
A severe problem in the processing of encrypted data is that very often, in order to perform arithmetic operations on the data, one has to convert the data back to its nonencrypted origin before performing the required operations. This paper addresses the issue of processing data that have been encrypted while the data are in an encrypted mode. It develops a new approach for encryption models that can facilitate the processing of such data. The advantages of this approach are reviewed, and a basic algorithm is developed to prove the feasibility of the approach.
A metamodel of information flow: a tool to support information systems theory
In this paper an axiomatic, fundamental metamodel of data flow is constructed. The components of the metamodel are the states along the flow of data: physical events, language (data), stored data, human data processing, and decision making. Transfers from one state to another are performed by functions: coding, keying, processing, perceptions, and human acting. The entire flow is evaluated by a value function. Each of the states and functions is rigorously described by means of definitions, axioms, and theorems. The main purpose of the metamodel is to provide a common framework for various models in MIS and consequently to remedy the "Tower of Babel" syndrome prevailing in this area. The way the metamodel can be used to develop other models in MIS is explained in the last part of the paper.
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