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- Vincent Y. Lum, H. Ling
- ACM '71
- 1971

The use of index files for accessing records, on the basis of secondary key values is a common feature of existing information systems. This method, judiciously applied, provides major improvements in response time, is easy to implement and costs relatively little. Moreover, the concepts of secondary indexes are simple, yet powerful and flexible because… (More)

- Vincent Y. Lum, H. Ling, Michael E. Senko
- AFIPS Fall Joint Computing Conference
- 1970

The typical paper on file organization presents a qualitative discussion of a proposed search structure. In a very few instances, the writer may include one or two numbers to indicate system performance. In reading these papers, one is led to the impression that file design is an extremely simple problem and that intuitive guesses can easily provide optimal… (More)

- Vincent Y. Lum, Michael E. Senko, C. P. Wang, H. Ling
- Commun. ACM
- 1975

Data set allocation in today's multilevel storage systems is usually based on qualitative, ad hoc decisions. While it would be desirable to obtain an optimal solution to this allocation problem, it is clear that the number of parameters involved makes it intractable to straight-forward solution. In such a situation, we must find a set of assumptions which… (More)

- H. Ling
- AFIPS Spring Joint Computing Conference
- 1971

Beyond the steps of SHIFT and SUBTRACT, division used in early machines generally relied upon Newton's method. In order to increase the speed of division the following two approaches, namely the <i>S-R-T</i> recoding method and the iterative multiplication scheme, have resulted. The S-R-T-method offering an average shifting distance of 2.6 bits is very… (More)

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